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# node-canvas
![Test](https://github.com/Automattic/node-canvas/workflows/Test/badge.svg)
[![NPM version](https://badge.fury.io/js/canvas.svg)](http://badge.fury.io/js/canvas)
node-canvas is a [Cairo](http://cairographics.org/)-backed Canvas implementation for [Node.js](http://nodejs.org).
## Installation
```bash
$ npm install canvas
```
By default, pre-built binaries will be downloaded if you're on one of the following platforms:
- macOS x86/64
- macOS aarch64 (aka Apple silicon)
- Linux x86/64 (glibc only)
- Windows x86/64
If you want to build from source, use `npm install --build-from-source` and see the **Compiling** section below.
The minimum version of Node.js required is **18.12.0**.
### Compiling
If you don't have a supported OS or processor architecture, or you use `--build-from-source`, the module will be compiled on your system. This requires several dependencies, including Cairo and Pango.
For detailed installation information, see the [wiki](https://github.com/Automattic/node-canvas/wiki/_pages). One-line installation instructions for common OSes are below. Note that libgif/giflib, librsvg and libjpeg are optional and only required if you need GIF, SVG and JPEG support, respectively. Cairo v1.10.0 or later is required.
OS | Command
----- | -----
macOS | Using [Homebrew](https://brew.sh/):<br/>`brew install pkg-config cairo pango libpng jpeg giflib librsvg pixman python-setuptools`
Ubuntu | `sudo apt-get install build-essential libcairo2-dev libpango1.0-dev libjpeg-dev libgif-dev librsvg2-dev`
Fedora | `sudo yum install gcc-c++ cairo-devel pango-devel libjpeg-turbo-devel giflib-devel`
Solaris | `pkgin install cairo pango pkg-config xproto renderproto kbproto xextproto`
OpenBSD | `doas pkg_add cairo pango png jpeg giflib`
Windows | See the [wiki](https://github.com/Automattic/node-canvas/wiki/Installation:-Windows)
Others | See the [wiki](https://github.com/Automattic/node-canvas/wiki)
**Mac OS X v10.11+:** If you have recently updated to Mac OS X v10.11+ and are experiencing trouble when compiling, run the following command: `xcode-select --install`. Read more about the problem [on Stack Overflow](http://stackoverflow.com/a/32929012/148072).
If you have xcode 10.0 or higher installed, in order to build from source you need NPM 6.4.1 or higher.
## Quick Example
```javascript
const { createCanvas, loadImage } = require('canvas')
const canvas = createCanvas(200, 200)
const ctx = canvas.getContext('2d')
// Write "Awesome!"
ctx.font = '30px Impact'
ctx.rotate(0.1)
ctx.fillText('Awesome!', 50, 100)
// Draw line under text
var text = ctx.measureText('Awesome!')
ctx.strokeStyle = 'rgba(0,0,0,0.5)'
ctx.beginPath()
ctx.lineTo(50, 102)
ctx.lineTo(50 + text.width, 102)
ctx.stroke()
// Draw cat with lime helmet
loadImage('examples/images/lime-cat.jpg').then((image) => {
ctx.drawImage(image, 50, 0, 70, 70)
console.log('<img src="' + canvas.toDataURL() + '" />')
})
```
## Upgrading from 1.x to 2.x
See the [changelog](https://github.com/Automattic/node-canvas/blob/master/CHANGELOG.md) for a guide to upgrading from 1.x to 2.x.
For version 1.x documentation, see [the v1.x branch](https://github.com/Automattic/node-canvas/tree/v1.x).
## Documentation
This project is an implementation of the Web Canvas API and implements that API as closely as possible. For API documentation, please visit [Mozilla Web Canvas API](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API). (See [Compatibility Status](https://github.com/Automattic/node-canvas/wiki/Compatibility-Status) for the current API compliance.) All utility methods and non-standard APIs are documented below.
### Utility methods
* [createCanvas()](#createcanvas)
* [createImageData()](#createimagedata)
* [loadImage()](#loadimage)
* [registerFont()](#registerfont)
* [deregisterAllFonts()](#deregisterAllFonts)
### Non-standard APIs
* [Image#src](#imagesrc)
* [Image#dataMode](#imagedatamode)
* [Canvas#toBuffer()](#canvastobuffer)
* [Canvas#createPNGStream()](#canvascreatepngstream)
* [Canvas#createJPEGStream()](#canvascreatejpegstream)
* [Canvas#createPDFStream()](#canvascreatepdfstream)
* [Canvas#toDataURL()](#canvastodataurl)
* [CanvasRenderingContext2D#patternQuality](#canvasrenderingcontext2dpatternquality)
* [CanvasRenderingContext2D#quality](#canvasrenderingcontext2dquality)
* [CanvasRenderingContext2D#textDrawingMode](#canvasrenderingcontext2dtextdrawingmode)
* [CanvasRenderingContext2D#globalCompositeOperation = 'saturate'](#canvasrenderingcontext2dglobalcompositeoperation--saturate)
* [CanvasRenderingContext2D#antialias](#canvasrenderingcontext2dantialias)
### createCanvas()
> ```ts
> createCanvas(width: number, height: number, type?: 'PDF'|'SVG') => Canvas
> ```
Creates a Canvas instance. This method works in both Node.js and Web browsers, where there is no Canvas constructor. (See `browser.js` for the implementation that runs in browsers.)
```js
const { createCanvas } = require('canvas')
const mycanvas = createCanvas(200, 200)
const myPDFcanvas = createCanvas(600, 800, 'pdf') // see "PDF Support" section
```
### createImageData()
> ```ts
> createImageData(width: number, height: number) => ImageData
> createImageData(data: Uint8ClampedArray, width: number, height?: number) => ImageData
> // for alternative pixel formats:
> createImageData(data: Uint16Array, width: number, height?: number) => ImageData
> ```
Creates an ImageData instance. This method works in both Node.js and Web browsers.
```js
const { createImageData } = require('canvas')
const width = 20, height = 20
const arraySize = width * height * 4
const mydata = createImageData(new Uint8ClampedArray(arraySize), width)
```
### loadImage()
> ```ts
> loadImage() => Promise<Image>
> ```
Convenience method for loading images. This method works in both Node.js and Web browsers.
```js
const { loadImage } = require('canvas')
const myimg = loadImage('http://server.com/image.png')
myimg.then(() => {
// do something with image
}).catch(err => {
console.log('oh no!', err)
})
// or with async/await:
const myimg = await loadImage('http://server.com/image.png')
// do something with image
```
### registerFont()
> ```ts
> registerFont(path: string, { family: string, weight?: string, style?: string }) => void
> ```
To use a font file that is not installed as a system font, use `registerFont()` to register the font with Canvas.
```js
const { registerFont, createCanvas } = require('canvas')
registerFont('comicsans.ttf', { family: 'Comic Sans' })
const canvas = createCanvas(500, 500)
const ctx = canvas.getContext('2d')
ctx.font = '12px "Comic Sans"'
ctx.fillText('Everyone hates this font :(', 250, 10)
```
The second argument is an object with properties that resemble the CSS properties that are specified in `@font-face` rules. You must specify at least `family`. `weight`, and `style` are optional and default to `'normal'`.
### deregisterAllFonts()
> ```ts
> deregisterAllFonts() => void
> ```
Use `deregisterAllFonts` to unregister all fonts that have been previously registered. This method is useful when you want to remove all registered fonts, such as when using the canvas in tests
```ts
const { registerFont, createCanvas, deregisterAllFonts } = require('canvas')
describe('text rendering', () => {
afterEach(() => {
deregisterAllFonts();
})
it('should render text with Comic Sans', () => {
registerFont('comicsans.ttf', { family: 'Comic Sans' })
const canvas = createCanvas(500, 500)
const ctx = canvas.getContext('2d')
ctx.font = '12px "Comic Sans"'
ctx.fillText('Everyone loves this font :)', 250, 10)
// assertScreenshot()
})
})
```
### Image#src
> ```ts
> img.src: string|Buffer
> ```
As in browsers, `img.src` can be set to a `data:` URI or a remote URL. In addition, node-canvas allows setting `src` to a local file path or `Buffer` instance.
```javascript
const { Image } = require('canvas')
// From a buffer:
fs.readFile('images/squid.png', (err, squid) => {
if (err) throw err
const img = new Image()
img.onload = () => ctx.drawImage(img, 0, 0)
img.onerror = err => { throw err }
img.src = squid
})
// From a local file path:
const img = new Image()
img.onload = () => ctx.drawImage(img, 0, 0)
img.onerror = err => { throw err }
img.src = 'images/squid.png'
// From a remote URL:
img.src = 'http://picsum.photos/200/300'
// ... as above
// From a `data:` URI:
img.src = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg=='
// ... as above
```
*Note: In some cases, `img.src=` is currently synchronous. However, you should always use `img.onload` and `img.onerror`, as we intend to make `img.src=` always asynchronous as it is in browsers. See https://github.com/Automattic/node-canvas/issues/1007.*
### Image#dataMode
> ```ts
> img.dataMode: number
> ```
Applies to JPEG images drawn to PDF canvases only.
Setting `img.dataMode = Image.MODE_MIME` or `Image.MODE_MIME|Image.MODE_IMAGE` enables MIME data tracking of images. When MIME data is tracked, PDF canvases can embed JPEGs directly into the output, rather than re-encoding into PNG. This can drastically reduce filesize and speed up rendering.
```javascript
const { Image, createCanvas } = require('canvas')
const canvas = createCanvas(w, h, 'pdf')
const img = new Image()
img.dataMode = Image.MODE_IMAGE // Only image data tracked
img.dataMode = Image.MODE_MIME // Only mime data tracked
img.dataMode = Image.MODE_MIME | Image.MODE_IMAGE // Both are tracked
```
If working with a non-PDF canvas, image data *must* be tracked; otherwise the output will be junk.
Enabling mime data tracking has no benefits (only a slow down) unless you are generating a PDF.
### Canvas#toBuffer()
> ```ts
> canvas.toBuffer((err: Error|null, result: Buffer) => void, mimeType?: string, config?: any) => void
> canvas.toBuffer(mimeType?: string, config?: any) => Buffer
> ```
Creates a [`Buffer`](https://nodejs.org/api/buffer.html) object representing the image contained in the canvas.
* **callback** If provided, the buffer will be provided in the callback instead of being returned by the function. Invoked with an error as the first argument if encoding failed, or the resulting buffer as the second argument if it succeeded. Not supported for mimeType `raw` or for PDF or SVG canvases.
* **mimeType** A string indicating the image format. Valid options are `image/png`, `image/jpeg` (if node-canvas was built with JPEG support), `raw` (unencoded data in BGRA order on little-endian (most) systems, ARGB on big-endian systems; top-to-bottom), `application/pdf` (for PDF canvases) and `image/svg+xml` (for SVG canvases). Defaults to `image/png` for image canvases, or the corresponding type for PDF or SVG canvas.
* **config**
* For `image/jpeg`, an object specifying the quality (0 to 1), if progressive compression should be used and/or if chroma subsampling should be used: `{quality: 0.75, progressive: false, chromaSubsampling: true}`. All properties are optional.
* For `image/png`, an object specifying the ZLIB compression level (between 0 and 9), the compression filter(s), the palette (indexed PNGs only), the the background palette index (indexed PNGs only) and/or the resolution (ppi): `{compressionLevel: 6, filters: canvas.PNG_ALL_FILTERS, palette: undefined, backgroundIndex: 0, resolution: undefined}`. All properties are optional.
Note that the PNG format encodes the resolution in pixels per meter, so if you specify `96`, the file will encode 3780 ppm (~96.01 ppi). The resolution is undefined by default to match common browser behavior.
* For `application/pdf`, an object specifying optional document metadata: `{title: string, author: string, subject: string, keywords: string, creator: string, creationDate: Date, modDate: Date}`. All properties are optional and default to `undefined`, except for `creationDate`, which defaults to the current date. *Adding metadata requires Cairo 1.16.0 or later.*
For a description of these properties, see page 550 of [PDF 32000-1:2008](https://www.adobe.com/content/dam/acom/en/devnet/acrobat/pdfs/PDF32000_2008.pdf).
Note that there is no standard separator for `keywords`. A space is recommended because it is in common use by other applications, and Cairo will enclose the list of keywords in quotes if a comma or semicolon is used.
**Return value**
If no callback is provided, a [`Buffer`](https://nodejs.org/api/buffer.html). If a callback is provided, none.
#### Examples
```js
// Default: buf contains a PNG-encoded image
const buf = canvas.toBuffer()
// PNG-encoded, zlib compression level 3 for faster compression but bigger files, no filtering
const buf2 = canvas.toBuffer('image/png', { compressionLevel: 3, filters: canvas.PNG_FILTER_NONE })
// JPEG-encoded, 50% quality
const buf3 = canvas.toBuffer('image/jpeg', { quality: 0.5 })
// Asynchronous PNG
canvas.toBuffer((err, buf) => {
if (err) throw err // encoding failed
// buf is PNG-encoded image
})
canvas.toBuffer((err, buf) => {
if (err) throw err // encoding failed
// buf is JPEG-encoded image at 95% quality
}, 'image/jpeg', { quality: 0.95 })
// BGRA pixel values, native-endian
const buf4 = canvas.toBuffer('raw')
const { stride, width } = canvas
// In memory, this is `canvas.height * canvas.stride` bytes long.
// The top row of pixels, in BGRA order on little-endian hardware,
// left-to-right, is:
const topPixelsBGRALeftToRight = buf4.slice(0, width * 4)
// And the third row is:
const row3 = buf4.slice(2 * stride, 2 * stride + width * 4)
// SVG and PDF canvases
const myCanvas = createCanvas(w, h, 'pdf')
myCanvas.toBuffer() // returns a buffer containing a PDF-encoded canvas
// With optional metadata:
myCanvas.toBuffer('application/pdf', {
title: 'my picture',
keywords: 'node.js demo cairo',
creationDate: new Date()
})
```
### Canvas#createPNGStream()
> ```ts
> canvas.createPNGStream(config?: any) => ReadableStream
> ```
Creates a [`ReadableStream`](https://nodejs.org/api/stream.html#stream_class_stream_readable) that emits PNG-encoded data.
* `config` An object specifying the ZLIB compression level (between 0 and 9), the compression filter(s), the palette (indexed PNGs only) and/or the background palette index (indexed PNGs only): `{compressionLevel: 6, filters: canvas.PNG_ALL_FILTERS, palette: undefined, backgroundIndex: 0, resolution: undefined}`. All properties are optional.
#### Examples
```javascript
const fs = require('fs')
const out = fs.createWriteStream(__dirname + '/test.png')
const stream = canvas.createPNGStream()
stream.pipe(out)
out.on('finish', () => console.log('The PNG file was created.'))
```
To encode indexed PNGs from canvases with `pixelFormat: 'A8'` or `'A1'`, provide an options object:
```js
const palette = new Uint8ClampedArray([
//r g b a
0, 50, 50, 255, // index 1
10, 90, 90, 255, // index 2
127, 127, 255, 255
// ...
])
canvas.createPNGStream({
palette: palette,
backgroundIndex: 0 // optional, defaults to 0
})
```
### Canvas#createJPEGStream()
> ```ts
> canvas.createJPEGStream(config?: any) => ReadableStream
> ```
Creates a [`ReadableStream`](https://nodejs.org/api/stream.html#stream_class_stream_readable) that emits JPEG-encoded data.
*Note: At the moment, `createJPEGStream()` is synchronous under the hood. That is, it runs in the main thread, not in the libuv threadpool.*
* `config` an object specifying the quality (0 to 1), if progressive compression should be used and/or if chroma subsampling should be used: `{quality: 0.75, progressive: false, chromaSubsampling: true}`. All properties are optional.
#### Examples
```javascript
const fs = require('fs')
const out = fs.createWriteStream(__dirname + '/test.jpeg')
const stream = canvas.createJPEGStream()
stream.pipe(out)
out.on('finish', () => console.log('The JPEG file was created.'))
// Disable 2x2 chromaSubsampling for deeper colors and use a higher quality
const stream = canvas.createJPEGStream({
quality: 0.95,
chromaSubsampling: false
})
```
### Canvas#createPDFStream()
> ```ts
> canvas.createPDFStream(config?: any) => ReadableStream
> ```
* `config` an object specifying optional document metadata: `{title: string, author: string, subject: string, keywords: string, creator: string, creationDate: Date, modDate: Date}`. See `toBuffer()` for more information. *Adding metadata requires Cairo 1.16.0 or later.*
Applies to PDF canvases only. Creates a [`ReadableStream`](https://nodejs.org/api/stream.html#stream_class_stream_readable) that emits the encoded PDF. `canvas.toBuffer()` also produces an encoded PDF, but `createPDFStream()` can be used to reduce memory usage.
### Canvas#toDataURL()
This is a standard API, but several non-standard calls are supported. The full list of supported calls is:
```js
dataUrl = canvas.toDataURL() // defaults to PNG
dataUrl = canvas.toDataURL('image/png')
dataUrl = canvas.toDataURL('image/jpeg')
dataUrl = canvas.toDataURL('image/jpeg', quality) // quality from 0 to 1
canvas.toDataURL((err, png) => { }) // defaults to PNG
canvas.toDataURL('image/png', (err, png) => { })
canvas.toDataURL('image/jpeg', (err, jpeg) => { }) // sync JPEG is not supported
canvas.toDataURL('image/jpeg', {...opts}, (err, jpeg) => { }) // see Canvas#createJPEGStream for valid options
canvas.toDataURL('image/jpeg', quality, (err, jpeg) => { }) // spec-following; quality from 0 to 1
```
### CanvasRenderingContext2D#patternQuality
> ```ts
> context.patternQuality: 'fast'|'good'|'best'|'nearest'|'bilinear'
> ```
Defaults to `'good'`. Affects pattern (gradient, image, etc.) rendering quality.
### CanvasRenderingContext2D#quality
> ```ts
> context.quality: 'fast'|'good'|'best'|'nearest'|'bilinear'
> ```
Defaults to `'good'`. Like `patternQuality`, but applies to transformations affecting more than just patterns.
### CanvasRenderingContext2D#textDrawingMode
> ```ts
> context.textDrawingMode: 'path'|'glyph'
> ```
Defaults to `'path'`. The effect depends on the canvas type:
* **Standard (image)** `glyph` and `path` both result in rasterized text. Glyph mode is faster than `path`, but may result in lower-quality text, especially when rotated or translated.
* **PDF** `glyph` will embed text instead of paths into the PDF. This is faster to encode, faster to open with PDF viewers, yields a smaller file size and makes the text selectable. The subset of the font needed to render the glyphs will be embedded in the PDF. This is usually the mode you want to use with PDF canvases.
* **SVG** `glyph` does *not* cause `<text>` elements to be produced as one might expect ([cairo bug](https://gitlab.freedesktop.org/cairo/cairo/issues/253)). Rather, `glyph` will create a `<defs>` section with a `<symbol>` for each glyph, then those glyphs be reused via `<use>` elements. `path` mode creates a `<path>` element for each text string. `glyph` mode is faster and yields a smaller file size.
In `glyph` mode, `ctx.strokeText()` and `ctx.fillText()` behave the same (aside from using the stroke and fill style, respectively).
This property is tracked as part of the canvas state in save/restore.
### CanvasRenderingContext2D#globalCompositeOperation = 'saturate'
In addition to all of the standard global composite operations defined by the Canvas specification, the ['saturate'](https://www.cairographics.org/operators/#saturate) operation is also available.
### CanvasRenderingContext2D#antialias
> ```ts
> context.antialias: 'default'|'none'|'gray'|'subpixel'
> ```
Sets the anti-aliasing mode.
## PDF Output Support
node-canvas can create PDF documents instead of images. The canvas type must be set when creating the canvas as follows:
```js
const canvas = createCanvas(200, 500, 'pdf')
```
An additional method `.addPage()` is then available to create multiple page PDFs:
```js
// On first page
ctx.font = '22px Helvetica'
ctx.fillText('Hello World', 50, 80)
ctx.addPage()
// Now on second page
ctx.font = '22px Helvetica'
ctx.fillText('Hello World 2', 50, 80)
canvas.toBuffer() // returns a PDF file
canvas.createPDFStream() // returns a ReadableStream that emits a PDF
// With optional document metadata (requires Cairo 1.16.0):
canvas.toBuffer('application/pdf', {
title: 'my picture',
keywords: 'node.js demo cairo',
creationDate: new Date()
})
```
It is also possible to create pages with different sizes by passing `width` and `height` to the `.addPage()` method:
```js
ctx.font = '22px Helvetica'
ctx.fillText('Hello World', 50, 80)
ctx.addPage(400, 800)
ctx.fillText('Hello World 2', 50, 80)
```
It is possible to add hyperlinks using `.beginTag()` and `.endTag()`:
```js
ctx.beginTag('Link', "uri='https://google.com'")
ctx.font = '22px Helvetica'
ctx.fillText('Hello World', 50, 80)
ctx.endTag('Link')
```
Or with a defined rectangle:
```js
ctx.beginTag('Link', "uri='https://google.com' rect=[50 80 100 20]")
ctx.endTag('Link')
```
Note that the syntax for attributes is unique to Cairo. See [cairo_tag_begin](https://www.cairographics.org/manual/cairo-Tags-and-Links.html#cairo-tag-begin) for the full documentation.
You can create areas on the canvas using the "cairo.dest" tag, and then link to them using the "Link" tag with the `dest=` attribute. You can also define PDF structure for accessibility by using tag names like "P", "H1", and "TABLE". The standard tags are defined in §14.8.4 of the [PDF 1.7](https://opensource.adobe.com/dc-acrobat-sdk-docs/pdfstandards/PDF32000_2008.pdf) specification.
See also:
* [Image#dataMode](#imagedatamode) for embedding JPEGs in PDFs
* [Canvas#createPDFStream()](#canvascreatepdfstream) for creating PDF streams
* [CanvasRenderingContext2D#textDrawingMode](#canvasrenderingcontext2dtextdrawingmode)
for embedding text instead of paths
## SVG Output Support
node-canvas can create SVG documents instead of images. The canvas type must be set when creating the canvas as follows:
```js
const canvas = createCanvas(200, 500, 'svg')
// Use the normal primitives.
fs.writeFileSync('out.svg', canvas.toBuffer())
```
## SVG Image Support
If librsvg is available when node-canvas is installed, node-canvas can render SVG images to your canvas context. This currently works by rasterizing the SVG image (i.e. drawing an SVG image to an SVG canvas will not preserve the SVG data).
```js
const img = new Image()
img.onload = () => ctx.drawImage(img, 0, 0)
img.onerror = err => { throw err }
img.src = './example.svg'
```
## Image pixel formats (experimental)
node-canvas has experimental support for additional pixel formats, roughly following the [Canvas color space proposal](https://github.com/WICG/canvas-color-space/blob/master/CanvasColorSpaceProposal.md).
```js
const canvas = createCanvas(200, 200)
const ctx = canvas.getContext('2d', { pixelFormat: 'A8' })
```
By default, canvases are created in the `RGBA32` format, which corresponds to the native HTML Canvas behavior. Each pixel is 32 bits. The JavaScript APIs that involve pixel data (`getImageData`, `putImageData`) store the colors in the order {red, green, blue, alpha} without alpha pre-multiplication. (The C++ API stores the colors in the order {alpha, red, green, blue} in native-[endian](https://en.wikipedia.org/wiki/Endianness) ordering, with alpha pre-multiplication.)
These additional pixel formats have experimental support:
* `RGB24` Like `RGBA32`, but the 8 alpha bits are always opaque. This format is always used if the `alpha` context attribute is set to false (i.e. `canvas.getContext('2d', {alpha: false})`). This format can be faster than `RGBA32` because transparency does not need to be calculated.
* `A8` Each pixel is 8 bits. This format can either be used for creating grayscale images (treating each byte as an alpha value), or for creating indexed PNGs (treating each byte as a palette index) (see [the example using alpha values with `fillStyle`](examples/indexed-png-alpha.js) and [the example using `imageData`](examples/indexed-png-image-data.js)).
* `RGB16_565` Each pixel is 16 bits, with red in the upper 5 bits, green in the middle 6 bits, and blue in the lower 5 bits, in native platform endianness. Some hardware devices and frame buffers use this format. Note that PNG does not support this format; when creating a PNG, the image will be converted to 24-bit RGB. This format is thus suboptimal for generating PNGs. `ImageData` instances for this mode use a `Uint16Array` instead of a `Uint8ClampedArray`.
* `A1` Each pixel is 1 bit, and pixels are packed together into 32-bit quantities. The ordering of the bits matches the endianness of the
platform: on a little-endian machine, the first pixel is the least-significant bit. This format can be used for creating single-color images. *Support for this format is incomplete, see note below.*
* `RGB30` Each pixel is 30 bits, with red in the upper 10, green in the middle 10, and blue in the lower 10. (Requires Cairo 1.12 or later.) *Support for this format is incomplete, see note below.*
Notes and caveats:
* Using a non-default format can affect the behavior of APIs that involve pixel data:
* `context2d.createImageData` The size of the array returned depends on the number of bit per pixel for the underlying image data format, per the above descriptions.
* `context2d.getImageData` The format of the array returned depends on the underlying image mode, per the above descriptions. Be aware of platform endianness, which can be determined using node.js's [`os.endianness()`](https://nodejs.org/api/os.html#os_os_endianness)
function.
* `context2d.putImageData` As above.
* `A1` and `RGB30` do not yet support `getImageData` or `putImageData`. Have a use case and/or opinion on working with these formats? Open an issue and let us know! (See #935.)
* `A1`, `A8`, `RGB30` and `RGB16_565` with shadow blurs may crash or not render properly.
* The `ImageData(width, height)` and `ImageData(Uint8ClampedArray, width)` constructors assume 4 bytes per pixel. To create an `ImageData` instance with a different number of bytes per pixel, use `new ImageData(new Uint8ClampedArray(size), width, height)` or `new ImageData(new Uint16ClampedArray(size), width, height)`.
## Testing
First make sure you've built the latest version. Get all the deps you need (see [compiling](#compiling) above), and run:
```
npm install --build-from-source
```
For visual tests: `npm run test-server` and point your browser to http://localhost:4000.
For unit tests: `npm run test`.
## Benchmarks
Benchmarks live in the `benchmarks` directory.
## Examples
Examples line in the `examples` directory. Most produce a png image of the same name, and others such as *live-clock.js* launch an HTTP server to be viewed in the browser.
## Original Authors
- TJ Holowaychuk ([tj](http://github.com/tj))
- Nathan Rajlich ([TooTallNate](http://github.com/TooTallNate))
- Rod Vagg ([rvagg](http://github.com/rvagg))
- Juriy Zaytsev ([kangax](http://github.com/kangax))
## License
### node-canvas
(The MIT License)
Copyright (c) 2010 LearnBoost, and contributors &lt;dev@learnboost.com&gt;
Copyright (c) 2014 Automattic, Inc and contributors &lt;dev@automattic.com&gt;
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the 'Software'), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
### BMP parser
See [license](src/bmp/LICENSE.md)

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{
'conditions': [
['OS=="win"', {
'variables': {
'GTK_Root%': 'C:/GTK', # Set the location of GTK all-in-one bundle
'with_jpeg%': 'false',
'with_gif%': 'false',
'with_rsvg%': 'false',
'variables': { # Nest jpeg_root to evaluate it before with_jpeg
'jpeg_root%': '<!(node ./util/win_jpeg_lookup)'
},
'jpeg_root%': '<(jpeg_root)', # Take value of nested variable
'conditions': [
['jpeg_root==""', {
'with_jpeg%': 'false'
}, {
'with_jpeg%': 'true'
}]
]
}
}, { # 'OS!="win"'
'variables': {
'with_jpeg%': '<!(node ./util/has_lib.js jpeg)',
'with_gif%': '<!(node ./util/has_lib.js gif)',
'with_rsvg%': '<!(node ./util/has_lib.js rsvg)'
}
}]
],
'targets': [
{
'target_name': 'canvas-postbuild',
'dependencies': ['canvas'],
'conditions': [
['OS=="win"', {
'copies': [{
'destination': '<(PRODUCT_DIR)',
'files': [
'<(GTK_Root)/bin/zlib1.dll',
'<(GTK_Root)/bin/libintl-8.dll',
'<(GTK_Root)/bin/libpng14-14.dll',
'<(GTK_Root)/bin/libpangocairo-1.0-0.dll',
'<(GTK_Root)/bin/libpango-1.0-0.dll',
'<(GTK_Root)/bin/libpangoft2-1.0-0.dll',
'<(GTK_Root)/bin/libpangowin32-1.0-0.dll',
'<(GTK_Root)/bin/libcairo-2.dll',
'<(GTK_Root)/bin/libfontconfig-1.dll',
'<(GTK_Root)/bin/libfreetype-6.dll',
'<(GTK_Root)/bin/libglib-2.0-0.dll',
'<(GTK_Root)/bin/libgobject-2.0-0.dll',
'<(GTK_Root)/bin/libgmodule-2.0-0.dll',
'<(GTK_Root)/bin/libgthread-2.0-0.dll',
'<(GTK_Root)/bin/libexpat-1.dll'
]
}]
}]
]
},
{
'target_name': 'canvas',
'include_dirs': ["<!(node -p \"require('node-addon-api').include_dir\")"],
'defines': [ 'NAPI_DISABLE_CPP_EXCEPTIONS', 'NODE_ADDON_API_ENABLE_MAYBE' ],
'sources': [
'src/backend/Backend.cc',
'src/backend/ImageBackend.cc',
'src/backend/PdfBackend.cc',
'src/backend/SvgBackend.cc',
'src/bmp/BMPParser.cc',
'src/Backends.cc',
'src/Canvas.cc',
'src/CanvasGradient.cc',
'src/CanvasPattern.cc',
'src/CanvasRenderingContext2d.cc',
'src/closure.cc',
'src/color.cc',
'src/Image.cc',
'src/ImageData.cc',
'src/init.cc',
'src/register_font.cc',
'src/FontParser.cc'
],
'conditions': [
['OS=="win"', {
'libraries': [
'-l<(GTK_Root)/lib/cairo.lib',
'-l<(GTK_Root)/lib/libpng.lib',
'-l<(GTK_Root)/lib/pangocairo-1.0.lib',
'-l<(GTK_Root)/lib/pango-1.0.lib',
'-l<(GTK_Root)/lib/freetype.lib',
'-l<(GTK_Root)/lib/glib-2.0.lib',
'-l<(GTK_Root)/lib/gobject-2.0.lib'
],
'include_dirs': [
'<(GTK_Root)/include',
'<(GTK_Root)/include/cairo',
'<(GTK_Root)/include/pango-1.0',
'<(GTK_Root)/include/glib-2.0',
'<(GTK_Root)/include/freetype2',
'<(GTK_Root)/lib/glib-2.0/include'
],
'defines': [
'_USE_MATH_DEFINES', # for M_PI
'NOMINMAX' # allow std::min/max to work
],
'configurations': {
'Debug': {
'msvs_settings': {
'VCCLCompilerTool': {
'WarningLevel': 4,
'ExceptionHandling': 1,
'DisableSpecificWarnings': [
4100, 4611
]
}
}
},
'Release': {
'msvs_settings': {
'VCCLCompilerTool': {
'WarningLevel': 4,
'ExceptionHandling': 1,
'DisableSpecificWarnings': [
4100, 4611
]
}
}
}
}
}, { # 'OS!="win"'
'libraries': [
'<!@(pkg-config pixman-1 --libs)',
'<!@(pkg-config cairo --libs)',
'<!@(pkg-config libpng --libs)',
'<!@(pkg-config pangocairo --libs)',
'<!@(pkg-config freetype2 --libs)'
],
'include_dirs': [
'<!@(pkg-config cairo --cflags-only-I | sed s/-I//g)',
'<!@(pkg-config libpng --cflags-only-I | sed s/-I//g)',
'<!@(pkg-config pangocairo --cflags-only-I | sed s/-I//g)',
'<!@(pkg-config freetype2 --cflags-only-I | sed s/-I//g)'
],
'cflags': ['-Wno-cast-function-type'],
'cflags!': ['-fno-exceptions'],
'cflags_cc!': ['-fno-exceptions']
}],
['OS=="mac"', {
'cflags+': ['-fvisibility=hidden'],
'xcode_settings': {
'GCC_SYMBOLS_PRIVATE_EXTERN': 'YES', # -fvisibility=hidden
'GCC_ENABLE_CPP_EXCEPTIONS': 'YES'
}
}],
['with_jpeg=="true"', {
'defines': [
'HAVE_JPEG'
],
'conditions': [
['OS=="win"', {
'copies': [{
'destination': '<(PRODUCT_DIR)',
'files': [
'<(jpeg_root)/bin/jpeg62.dll',
]
}],
'include_dirs': [
'<(jpeg_root)/include'
],
'libraries': [
'-l<(jpeg_root)/lib/jpeg.lib',
]
}, {
'include_dirs': [
'<!@(pkg-config libjpeg --cflags-only-I | sed s/-I//g)'
],
'libraries': [
'<!@(pkg-config libjpeg --libs)'
]
}]
]
}],
['with_gif=="true"', {
'defines': [
'HAVE_GIF'
],
'conditions': [
['OS=="win"', {
'libraries': [
'-l<(GTK_Root)/lib/gif.lib'
]
}, {
'include_dirs': [
'/opt/homebrew/include'
],
'libraries': [
'-L/opt/homebrew/lib',
'-lgif'
]
}]
]
}],
['with_rsvg=="true"', {
'defines': [
'HAVE_RSVG'
],
'conditions': [
['OS=="win"', {
'copies': [{
'destination': '<(PRODUCT_DIR)',
'files': [
'<(GTK_Root)/bin/librsvg-2-2.dll',
'<(GTK_Root)/bin/libgdk_pixbuf-2.0-0.dll',
'<(GTK_Root)/bin/libgio-2.0-0.dll',
'<(GTK_Root)/bin/libcroco-0.6-3.dll',
'<(GTK_Root)/bin/libgsf-1-114.dll',
'<(GTK_Root)/bin/libxml2-2.dll'
]
}],
'libraries': [
'-l<(GTK_Root)/lib/librsvg-2-2.lib'
]
}, {
'include_dirs': [
'<!@(pkg-config librsvg-2.0 --cflags-only-I | sed s/-I//g)'
],
'libraries': [
'<!@(pkg-config librsvg-2.0 --libs)'
]
}]
]
}]
]
}
]
}

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/* globals document, ImageData */
exports.createCanvas = function (width, height) {
return Object.assign(document.createElement('canvas'), { width: width, height: height })
}
exports.createImageData = function (array, width, height) {
// Browser implementation of ImageData looks at the number of arguments passed
switch (arguments.length) {
case 0: return new ImageData()
case 1: return new ImageData(array)
case 2: return new ImageData(array, width)
default: return new ImageData(array, width, height)
}
}
exports.loadImage = function (src, options) {
return new Promise(function (resolve, reject) {
const image = Object.assign(document.createElement('img'), options)
function cleanup () {
image.onload = null
image.onerror = null
}
image.onload = function () { cleanup(); resolve(image) }
image.onerror = function () { cleanup(); reject(new Error('Failed to load the image "' + src + '"')) }
image.src = src
})
}

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Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio 2015
Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "canvas", "canvas.vcxproj", "{90D75E7A-41A0-8814-61A2-B5859FC0E033}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|x64 = Debug|x64
Release|x64 = Release|x64
EndGlobalSection
GlobalSection(ProjectConfigurationPlatforms) = postSolution
{90D75E7A-41A0-8814-61A2-B5859FC0E033}.Debug|x64.ActiveCfg = Debug|x64
{90D75E7A-41A0-8814-61A2-B5859FC0E033}.Debug|x64.Build.0 = Debug|x64
{90D75E7A-41A0-8814-61A2-B5859FC0E033}.Release|x64.ActiveCfg = Release|x64
{90D75E7A-41A0-8814-61A2-B5859FC0E033}.Release|x64.Build.0 = Release|x64
EndGlobalSection
GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE
EndGlobalSection
EndGlobal

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<?xml version="1.0" encoding="utf-8"?>
<Project DefaultTargets="Build" ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<ItemGroup Label="ProjectConfigurations">
<ProjectConfiguration Include="Debug|x64">
<Configuration>Debug</Configuration>
<Platform>x64</Platform>
</ProjectConfiguration>
<ProjectConfiguration Include="Release|x64">
<Configuration>Release</Configuration>
<Platform>x64</Platform>
</ProjectConfiguration>
</ItemGroup>
<PropertyGroup Label="Globals">
<ProjectGuid>{90D75E7A-41A0-8814-61A2-B5859FC0E033}</ProjectGuid>
<Keyword>Win32Proj</Keyword>
<RootNamespace>canvas</RootNamespace>
<IgnoreWarnCompileDuplicatedFilename>true</IgnoreWarnCompileDuplicatedFilename>
<PreferredToolArchitecture>x64</PreferredToolArchitecture>
<WindowsTargetPlatformVersion>10.0.22000.0</WindowsTargetPlatformVersion>
</PropertyGroup>
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props"/>
<PropertyGroup Label="Configuration">
<ConfigurationType>DynamicLibrary</ConfigurationType>
</PropertyGroup>
<PropertyGroup Label="Locals">
<PlatformToolset>v142</PlatformToolset>
</PropertyGroup>
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.props"/>
<Import Project="$(VCTargetsPath)\BuildCustomizations\masm.props"/>
<ImportGroup Label="ExtensionSettings"/>
<ImportGroup Label="PropertySheets">
<Import Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props"/>
</ImportGroup>
<PropertyGroup Label="UserMacros"/>
<PropertyGroup>
<ExecutablePath>$(ExecutablePath);$(MSBuildProjectDirectory)\..\bin\;$(MSBuildProjectDirectory)\..\bin\</ExecutablePath>
<IgnoreImportLibrary>true</IgnoreImportLibrary>
<IntDir>$(Configuration)\obj\$(ProjectName)\</IntDir>
<LinkIncremental Condition="'$(Configuration)|$(Platform)'=='Release|x64'">false</LinkIncremental>
<LinkIncremental Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</LinkIncremental>
<OutDir>$(SolutionDir)$(Configuration)\</OutDir>
<TargetExt Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">.node</TargetExt>
<TargetExt Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">.node</TargetExt>
<TargetExt Condition="'$(Configuration)|$(Platform)'=='Release|x64'">.node</TargetExt>
<TargetExt Condition="'$(Configuration)|$(Platform)'=='Release|x64'">.node</TargetExt>
<TargetName>$(ProjectName)</TargetName>
<TargetPath>$(OutDir)\$(ProjectName).node</TargetPath>
</PropertyGroup>
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
<ClCompile>
<AdditionalIncludeDirectories>C:\Users\runneradmin\AppData\Local\node-gyp\Cache\21.7.3\include\node;C:\Users\runneradmin\AppData\Local\node-gyp\Cache\21.7.3\src;C:\Users\runneradmin\AppData\Local\node-gyp\Cache\21.7.3\deps\openssl\config;C:\Users\runneradmin\AppData\Local\node-gyp\Cache\21.7.3\deps\openssl\openssl\include;C:\Users\runneradmin\AppData\Local\node-gyp\Cache\21.7.3\deps\uv\include;C:\Users\runneradmin\AppData\Local\node-gyp\Cache\21.7.3\deps\zlib;C:\Users\runneradmin\AppData\Local\node-gyp\Cache\21.7.3\deps\v8\include;..\node_modules\node-addon-api;D:\a\_temp\msys64\ucrt64\include;D:\a\_temp\msys64\ucrt64\include\harfbuzz;D:\a\_temp\msys64\ucrt64\include\pango-1.0;D:\a\_temp\msys64\ucrt64\include\cairo;D:\a\_temp\msys64\ucrt64\include\libpng16;D:\a\_temp\msys64\ucrt64\include\glib-2.0;D:\a\_temp\msys64\ucrt64\lib\glib-2.0\include;D:\a\_temp\msys64\ucrt64\include\pixman-1;D:\a\_temp\msys64\ucrt64\include\freetype2;D:\a\_temp\msys64\ucrt64\include\fontconfig;D:\a\_temp\msys64\ucrt64\include\librsvg-2.0;D:\a\_temp\msys64\ucrt64\include\gdk-pixbuf-2.0;D:\a\_temp\msys64\ucrt64\include\libgsf-1;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<AdditionalOptions>/Zc:__cplusplus -std:c++17 %(AdditionalOptions)</AdditionalOptions>
<BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
<BufferSecurityCheck>true</BufferSecurityCheck>
<DebugInformationFormat>OldStyle</DebugInformationFormat>
<DisableSpecificWarnings>4100;4127;4201;4244;4267;4506;4611;4714;4512;4351;4355;4800;4251;4275;4244;4267;%(DisableSpecificWarnings)</DisableSpecificWarnings>
<ExceptionHandling>Sync</ExceptionHandling>
<MinimalRebuild>false</MinimalRebuild>
<MultiProcessorCompilation>true</MultiProcessorCompilation>
<OmitFramePointers>false</OmitFramePointers>
<Optimization>Disabled</Optimization>
<PrecompiledHeader>NotUsing</PrecompiledHeader>
<PreprocessorDefinitions>NODE_GYP_MODULE_NAME=canvas;USING_UV_SHARED=1;USING_V8_SHARED=1;V8_DEPRECATION_WARNINGS=1;_GLIBCXX_USE_CXX11_ABI=1;WIN32;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_DEPRECATE;_HAS_EXCEPTIONS=0;OPENSSL_NO_PINSHARED;OPENSSL_THREADS;HAVE_GIF;HAVE_JPEG;HAVE_RSVG;HAVE_BOOLEAN;_USE_MATH_DEFINES;NOMINMAX;NAPI_DISABLE_CPP_EXCEPTIONS;NODE_ADDON_API_ENABLE_MAYBE;BUILDING_NODE_EXTENSION;HOST_BINARY=&quot;node.exe&quot;;DEBUG;_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
<StringPooling>true</StringPooling>
<SuppressStartupBanner>true</SuppressStartupBanner>
<TreatWarningAsError>false</TreatWarningAsError>
<WarningLevel>Level4</WarningLevel>
<WholeProgramOptimization>true</WholeProgramOptimization>
</ClCompile>
<Lib>
<AdditionalOptions>/LTCG:INCREMENTAL %(AdditionalOptions)</AdditionalOptions>
</Lib>
<Link>
<AdditionalDependencies>kernel32.lib;user32.lib;gdi32.lib;winspool.lib;comdlg32.lib;advapi32.lib;shell32.lib;ole32.lib;oleaut32.lib;uuid.lib;odbc32.lib;DelayImp.lib;&quot;C:\\Users\\runneradmin\\AppData\\Local\\node-gyp\\Cache\\21.7.3\\x64\\node.lib&quot;;D:\a\_temp\msys64\ucrt64\lib\libcairo-2.lib;D:\a\_temp\msys64\ucrt64\lib\libpng16-16.lib;D:\a\_temp\msys64\ucrt64\lib\libjpeg-8.lib;D:\a\_temp\msys64\ucrt64\lib\libpango-1.0-0.lib;D:\a\_temp\msys64\ucrt64\lib\libpangocairo-1.0-0.lib;D:\a\_temp\msys64\ucrt64\lib\libgobject-2.0-0.lib;D:\a\_temp\msys64\ucrt64\lib\libglib-2.0-0.lib;D:\a\_temp\msys64\ucrt64\lib\libturbojpeg.lib;D:\a\_temp\msys64\ucrt64\lib\libgif-7.lib;D:\a\_temp\msys64\ucrt64\lib\libfreetype-6.lib;D:\a\_temp\msys64\ucrt64\lib\librsvg-2-2.lib</AdditionalDependencies>
<AdditionalOptions>/LTCG:INCREMENTAL /ignore:4199 %(AdditionalOptions)</AdditionalOptions>
<DelayLoadDLLs>node.exe;%(DelayLoadDLLs)</DelayLoadDLLs>
<EnableCOMDATFolding>true</EnableCOMDATFolding>
<GenerateDebugInformation>true</GenerateDebugInformation>
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506
node_modules/canvas/index.d.ts generated vendored Normal file
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@@ -0,0 +1,506 @@
// TypeScript Version: 3.0
import { Readable } from 'stream'
export interface PngConfig {
/** Specifies the ZLIB compression level. Defaults to 6. */
compressionLevel?: 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
/**
* Any bitwise combination of `PNG_FILTER_NONE`, `PNG_FILTER_SUB`,
* `PNG_FILTER_UP`, `PNG_FILTER_AVG` and `PNG_FILTER_PATETH`; or one of
* `PNG_ALL_FILTERS` or `PNG_NO_FILTERS` (all are properties of the canvas
* instance). These specify which filters *may* be used by libpng. During
* encoding, libpng will select the best filter from this list of allowed
* filters. Defaults to `canvas.PNG_ALL_FILTERS`.
*/
filters?: number
/**
* _For creating indexed PNGs._ The palette of colors. Entries should be in
* RGBA order.
*/
palette?: Uint8ClampedArray
/**
* _For creating indexed PNGs._ The index of the background color. Defaults
* to 0.
*/
backgroundIndex?: number
/** pixels per inch */
resolution?: number
}
export interface JpegConfig {
/** Specifies the quality, between 0 and 1. Defaults to 0.75. */
quality?: number
/** Enables progressive encoding. Defaults to `false`. */
progressive?: boolean
/** Enables 2x2 chroma subsampling. Defaults to `true`. */
chromaSubsampling?: boolean
}
export interface PdfConfig {
title?: string
author?: string
subject?: string
keywords?: string
creator?: string
creationDate?: Date
modDate?: Date
}
export interface NodeCanvasRenderingContext2DSettings {
alpha?: boolean
pixelFormat?: 'RGBA32' | 'RGB24' | 'A8' | 'RGB16_565' | 'A1' | 'RGB30'
}
export class Canvas {
width: number
height: number
/** _Non standard._ The type of the canvas. */
readonly type: 'image'|'pdf'|'svg'
/** _Non standard._ Getter. The stride used by the canvas. */
readonly stride: number;
/** Constant used in PNG encoding methods. */
static readonly PNG_NO_FILTERS: number
/** Constant used in PNG encoding methods. */
static readonly PNG_ALL_FILTERS: number
/** Constant used in PNG encoding methods. */
static readonly PNG_FILTER_NONE: number
/** Constant used in PNG encoding methods. */
static readonly PNG_FILTER_SUB: number
/** Constant used in PNG encoding methods. */
static readonly PNG_FILTER_UP: number
/** Constant used in PNG encoding methods. */
static readonly PNG_FILTER_AVG: number
/** Constant used in PNG encoding methods. */
static readonly PNG_FILTER_PAETH: number
constructor(width: number, height: number, type?: 'image'|'pdf'|'svg')
getContext(contextId: '2d', contextAttributes?: NodeCanvasRenderingContext2DSettings): CanvasRenderingContext2D
/**
* For image canvases, encodes the canvas as a PNG. For PDF canvases,
* encodes the canvas as a PDF. For SVG canvases, encodes the canvas as an
* SVG.
*/
toBuffer(cb: (err: Error|null, result: Buffer) => void): void
toBuffer(cb: (err: Error|null, result: Buffer) => void, mimeType: 'image/png', config?: PngConfig): void
toBuffer(cb: (err: Error|null, result: Buffer) => void, mimeType: 'image/jpeg', config?: JpegConfig): void
/**
* For image canvases, encodes the canvas as a PNG. For PDF canvases,
* encodes the canvas as a PDF. For SVG canvases, encodes the canvas as an
* SVG.
*/
toBuffer(): Buffer
toBuffer(mimeType: 'image/png', config?: PngConfig): Buffer
toBuffer(mimeType: 'image/jpeg', config?: JpegConfig): Buffer
toBuffer(mimeType: 'application/pdf', config?: PdfConfig): Buffer
/**
* Returns the unencoded pixel data, top-to-bottom. On little-endian (most)
* systems, the array will be ordered BGRA; on big-endian systems, it will
* be ARGB.
*/
toBuffer(mimeType: 'raw'): Buffer
createPNGStream(config?: PngConfig): PNGStream
createJPEGStream(config?: JpegConfig): JPEGStream
createPDFStream(config?: PdfConfig): PDFStream
/** Defaults to PNG image. */
toDataURL(): string
toDataURL(mimeType: 'image/png'): string
toDataURL(mimeType: 'image/jpeg', quality?: number): string
/** _Non-standard._ Defaults to PNG image. */
toDataURL(cb: (err: Error|null, result: string) => void): void
/** _Non-standard._ */
toDataURL(mimeType: 'image/png', cb: (err: Error|null, result: string) => void): void
/** _Non-standard._ */
toDataURL(mimeType: 'image/jpeg', cb: (err: Error|null, result: string) => void): void
/** _Non-standard._ */
toDataURL(mimeType: 'image/jpeg', config: JpegConfig, cb: (err: Error|null, result: string) => void): void
/** _Non-standard._ */
toDataURL(mimeType: 'image/jpeg', quality: number, cb: (err: Error|null, result: string) => void): void
}
export interface TextMetrics {
readonly alphabeticBaseline: number;
readonly actualBoundingBoxAscent: number;
readonly actualBoundingBoxDescent: number;
readonly actualBoundingBoxLeft: number;
readonly actualBoundingBoxRight: number;
readonly emHeightAscent: number;
readonly emHeightDescent: number;
readonly fontBoundingBoxAscent: number;
readonly fontBoundingBoxDescent: number;
readonly width: number;
}
export type CanvasFillRule = 'evenodd' | 'nonzero';
export type GlobalCompositeOperation =
| 'clear'
| 'copy'
| 'destination'
| 'source-over'
| 'destination-over'
| 'source-in'
| 'destination-in'
| 'source-out'
| 'destination-out'
| 'source-atop'
| 'destination-atop'
| 'xor'
| 'lighter'
| 'normal'
| 'multiply'
| 'screen'
| 'overlay'
| 'darken'
| 'lighten'
| 'color-dodge'
| 'color-burn'
| 'hard-light'
| 'soft-light'
| 'difference'
| 'exclusion'
| 'hue'
| 'saturation'
| 'color'
| 'luminosity'
| 'saturate';
export type CanvasLineCap = 'butt' | 'round' | 'square';
export type CanvasLineJoin = 'bevel' | 'miter' | 'round';
export type CanvasTextBaseline = 'alphabetic' | 'bottom' | 'hanging' | 'ideographic' | 'middle' | 'top';
export type CanvasTextAlign = 'center' | 'end' | 'left' | 'right' | 'start';
export class CanvasRenderingContext2D {
drawImage(image: Canvas|Image, dx: number, dy: number): void
drawImage(image: Canvas|Image, dx: number, dy: number, dw: number, dh: number): void
drawImage(image: Canvas|Image, sx: number, sy: number, sw: number, sh: number, dx: number, dy: number, dw: number, dh: number): void
putImageData(imagedata: ImageData, dx: number, dy: number): void;
putImageData(imagedata: ImageData, dx: number, dy: number, dirtyX: number, dirtyY: number, dirtyWidth: number, dirtyHeight: number): void;
getImageData(sx: number, sy: number, sw: number, sh: number): ImageData;
createImageData(sw: number, sh: number): ImageData;
createImageData(imagedata: ImageData): ImageData;
/**
* For PDF canvases, adds another page. If width and/or height are omitted,
* the canvas's initial size is used.
*/
addPage(width?: number, height?: number): void
save(): void;
restore(): void;
rotate(angle: number): void;
translate(x: number, y: number): void;
transform(a: number, b: number, c: number, d: number, e: number, f: number): void;
getTransform(): DOMMatrix;
resetTransform(): void;
setTransform(transform?: DOMMatrix): void;
setTransform(a: number, b: number, c: number, d: number, e: number, f: number): void;
isPointInPath(x: number, y: number, fillRule?: CanvasFillRule): boolean;
scale(x: number, y: number): void;
clip(fillRule?: CanvasFillRule): void;
fill(fillRule?: CanvasFillRule): void;
stroke(): void;
fillText(text: string, x: number, y: number, maxWidth?: number): void;
strokeText(text: string, x: number, y: number, maxWidth?: number): void;
fillRect(x: number, y: number, w: number, h: number): void;
strokeRect(x: number, y: number, w: number, h: number): void;
clearRect(x: number, y: number, w: number, h: number): void;
rect(x: number, y: number, w: number, h: number): void;
roundRect(x: number, y: number, w: number, h: number, radii?: number | number[]): void;
measureText(text: string): TextMetrics;
moveTo(x: number, y: number): void;
lineTo(x: number, y: number): void;
bezierCurveTo(cp1x: number, cp1y: number, cp2x: number, cp2y: number, x: number, y: number): void;
quadraticCurveTo(cpx: number, cpy: number, x: number, y: number): void;
beginPath(): void;
closePath(): void;
arc(x: number, y: number, radius: number, startAngle: number, endAngle: number, counterclockwise?: boolean): void;
arcTo(x1: number, y1: number, x2: number, y2: number, radius: number): void;
ellipse(x: number, y: number, radiusX: number, radiusY: number, rotation: number, startAngle: number, endAngle: number, counterclockwise?: boolean): void;
setLineDash(segments: number[]): void;
getLineDash(): number[];
createPattern(image: Canvas|Image, repetition: 'repeat' | 'repeat-x' | 'repeat-y' | 'no-repeat' | '' | null): CanvasPattern
createLinearGradient(x0: number, y0: number, x1: number, y1: number): CanvasGradient;
createRadialGradient(x0: number, y0: number, r0: number, x1: number, y1: number, r1: number): CanvasGradient;
beginTag(tagName: string, attributes?: string): void;
endTag(tagName: string): void;
/**
* _Non-standard_. Defaults to 'good'. Affects pattern (gradient, image,
* etc.) rendering quality.
*/
patternQuality: 'fast' | 'good' | 'best' | 'nearest' | 'bilinear'
imageSmoothingEnabled: boolean;
globalCompositeOperation: GlobalCompositeOperation;
globalAlpha: number;
shadowColor: string;
miterLimit: number;
lineWidth: number;
lineCap: CanvasLineCap;
lineJoin: CanvasLineJoin;
lineDashOffset: number;
shadowOffsetX: number;
shadowOffsetY: number;
shadowBlur: number;
/** _Non-standard_. Sets the antialiasing mode. */
antialias: 'default' | 'gray' | 'none' | 'subpixel'
/**
* Defaults to 'path'. The effect depends on the canvas type:
*
* * **Standard (image)** `'glyph'` and `'path'` both result in rasterized
* text. Glyph mode is faster than path, but may result in lower-quality
* text, especially when rotated or translated.
*
* * **PDF** `'glyph'` will embed text instead of paths into the PDF. This
* is faster to encode, faster to open with PDF viewers, yields a smaller
* file size and makes the text selectable. The subset of the font needed
* to render the glyphs will be embedded in the PDF. This is usually the
* mode you want to use with PDF canvases.
*
* * **SVG** glyph does not cause `<text>` elements to be produced as one
* might expect ([cairo bug](https://gitlab.freedesktop.org/cairo/cairo/issues/253)).
* Rather, glyph will create a `<defs>` section with a `<symbol>` for each
* glyph, then those glyphs be reused via `<use>` elements. `'path'` mode
* creates a `<path>` element for each text string. glyph mode is faster
* and yields a smaller file size.
*
* In glyph mode, `ctx.strokeText()` and `ctx.fillText()` behave the same
* (aside from using the stroke and fill style, respectively).
*/
textDrawingMode: 'path' | 'glyph'
/**
* _Non-standard_. Defaults to 'good'. Like `patternQuality`, but applies to
* transformations affecting more than just patterns.
*/
quality: 'fast' | 'good' | 'best' | 'nearest' | 'bilinear'
/** Returns or sets a `DOMMatrix` for the current transformation matrix. */
currentTransform: DOMMatrix
fillStyle: string | CanvasGradient | CanvasPattern;
strokeStyle: string | CanvasGradient | CanvasPattern;
font: string;
textBaseline: CanvasTextBaseline;
textAlign: CanvasTextAlign;
canvas: Canvas;
direction: 'ltr' | 'rtl';
}
export class CanvasGradient {
addColorStop(offset: number, color: string): void;
}
export class CanvasPattern {
setTransform(transform?: DOMMatrix): void;
}
// This does not extend HTMLImageElement because there are dozens of inherited
// methods and properties that we do not provide.
export class Image {
/** Track image data */
static readonly MODE_IMAGE: number
/** Track MIME data */
static readonly MODE_MIME: number
/**
* The URL, `data:` URI or local file path of the image to be loaded, or a
* Buffer instance containing an encoded image.
*/
src: string | Buffer
/** Retrieves whether the object is fully loaded. */
readonly complete: boolean
/** Sets or retrieves the height of the image. */
height: number
/** Sets or retrieves the width of the image. */
width: number
/** The original height of the image resource before sizing. */
readonly naturalHeight: number
/** The original width of the image resource before sizing. */
readonly naturalWidth: number
/**
* Applies to JPEG images drawn to PDF canvases only. Setting
* `img.dataMode = Image.MODE_MIME` or `Image.MODE_MIME|Image.MODE_IMAGE`
* enables image MIME data tracking. When MIME data is tracked, PDF canvases
* can embed JPEGs directly into the output, rather than re-encoding into
* PNG. This can drastically reduce filesize and speed up rendering.
*/
dataMode: number
onload: (() => void) | null;
onerror: ((err: Error) => void) | null;
}
/**
* Creates a Canvas instance. This function works in both Node.js and Web
* browsers, where there is no Canvas constructor.
* @param type Optionally specify to create a PDF or SVG canvas. Defaults to an
* image canvas.
*/
export function createCanvas(width: number, height: number, type?: 'pdf'|'svg'): Canvas
/**
* Creates an ImageData instance. This function works in both Node.js and Web
* browsers.
* @param data An array containing the pixel representation of the image.
* @param height If omitted, the height is calculated based on the array's size
* and `width`.
*/
export function createImageData(data: Uint8ClampedArray, width: number, height?: number): ImageData
/**
* _Non-standard._ Creates an ImageData instance for an alternative pixel
* format, such as RGB16_565
* @param data An array containing the pixel representation of the image.
* @param height If omitted, the height is calculated based on the array's size
* and `width`.
*/
export function createImageData(data: Uint16Array, width: number, height?: number): ImageData
/**
* Creates an ImageData instance. This function works in both Node.js and Web
* browsers.
*/
export function createImageData(width: number, height: number): ImageData
/**
* Convenience function for loading an image with a Promise interface. This
* function works in both Node.js and Web browsers; however, the `src` must be
* a string in Web browsers (it can only be a Buffer in Node.js).
* @param src URL, `data: ` URI or (Node.js only) a local file path or Buffer
* instance.
*/
export function loadImage(src: string|Buffer, options?: any): Promise<Image>
/**
* Registers a font that is not installed as a system font. This must be used
* before creating Canvas instances.
* @param path Path to local font file.
* @param fontFace Description of the font face, corresponding to CSS properties
* used in `@font-face` rules.
*/
export function registerFont(path: string, fontFace: {family: string, weight?: string, style?: string}): void
/**
* Unloads all fonts
*/
export function deregisterAllFonts(): void;
/** This class must not be constructed directly; use `canvas.createPNGStream()`. */
export class PNGStream extends Readable {}
/** This class must not be constructed directly; use `canvas.createJPEGStream()`. */
export class JPEGStream extends Readable {}
/** This class must not be constructed directly; use `canvas.createPDFStream()`. */
export class PDFStream extends Readable {}
// TODO: this is wrong. See matrixTransform in lib/DOMMatrix.js
type DOMMatrixInit = DOMMatrix | string | number[];
interface DOMPointInit {
w?: number;
x?: number;
y?: number;
z?: number;
}
export class DOMPoint {
w: number;
x: number;
y: number;
z: number;
matrixTransform(matrix?: DOMMatrixInit): DOMPoint;
toJSON(): any;
static fromPoint(other?: DOMPointInit): DOMPoint;
}
export class DOMMatrix {
constructor(init?: string | number[]);
toString(): string;
multiply(other?: DOMMatrix): DOMMatrix;
multiplySelf(other?: DOMMatrix): DOMMatrix;
preMultiplySelf(other?: DOMMatrix): DOMMatrix;
translate(tx?: number, ty?: number, tz?: number): DOMMatrix;
translateSelf(tx?: number, ty?: number, tz?: number): DOMMatrix;
scale(scaleX?: number, scaleY?: number, scaleZ?: number, originX?: number, originY?: number, originZ?: number): DOMMatrix;
scale3d(scale?: number, originX?: number, originY?: number, originZ?: number): DOMMatrix;
scale3dSelf(scale?: number, originX?: number, originY?: number, originZ?: number): DOMMatrix;
scaleSelf(scaleX?: number, scaleY?: number, scaleZ?: number, originX?: number, originY?: number, originZ?: number): DOMMatrix;
/**
* @deprecated
*/
scaleNonUniform(scaleX?: number, scaleY?: number): DOMMatrix;
rotateFromVector(x?: number, y?: number): DOMMatrix;
rotateFromVectorSelf(x?: number, y?: number): DOMMatrix;
rotate(rotX?: number, rotY?: number, rotZ?: number): DOMMatrix;
rotateSelf(rotX?: number, rotY?: number, rotZ?: number): DOMMatrix;
rotateAxisAngle(x?: number, y?: number, z?: number, angle?: number): DOMMatrix;
rotateAxisAngleSelf(x?: number, y?: number, z?: number, angle?: number): DOMMatrix;
skewX(sx?: number): DOMMatrix;
skewXSelf(sx?: number): DOMMatrix;
skewY(sy?: number): DOMMatrix;
skewYSelf(sy?: number): DOMMatrix;
flipX(): DOMMatrix;
flipY(): DOMMatrix;
inverse(): DOMMatrix;
invertSelf(): DOMMatrix;
setMatrixValue(transformList: string): DOMMatrix;
transformPoint(point?: DOMPoint): DOMPoint;
toJSON(): any;
toFloat32Array(): Float32Array;
toFloat64Array(): Float64Array;
readonly is2D: boolean;
readonly isIdentity: boolean;
a: number;
b: number;
c: number;
d: number;
e: number;
f: number;
m11: number;
m12: number;
m13: number;
m14: number;
m21: number;
m22: number;
m23: number;
m24: number;
m31: number;
m32: number;
m33: number;
m34: number;
m41: number;
m42: number;
m43: number;
m44: number;
static fromMatrix(other: DOMMatrix): DOMMatrix;
static fromFloat32Array(a: Float32Array): DOMMatrix;
static fromFloat64Array(a: Float64Array): DOMMatrix;
}
export class ImageData {
constructor(sw: number, sh: number);
constructor(data: Uint8ClampedArray, sw: number, sh?: number);
readonly data: Uint8ClampedArray;
readonly height: number;
readonly width: number;
}
// Not documented: backends
/** Library version. */
export const version: string
/** Cairo version. */
export const cairoVersion: string
/** jpeglib version, if built with JPEG support. */
export const jpegVersion: string | undefined
/** giflib version, if built with GIF support. */
export const gifVersion: string | undefined
/** freetype version. */
export const freetypeVersion: string
/** rsvg version. */
export const rsvgVersion: string | undefined

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const Canvas = require('./lib/canvas')
const Image = require('./lib/image')
const CanvasRenderingContext2D = require('./lib/context2d')
const CanvasPattern = require('./lib/pattern')
const packageJson = require('./package.json')
const bindings = require('./lib/bindings')
const fs = require('fs')
const PNGStream = require('./lib/pngstream')
const PDFStream = require('./lib/pdfstream')
const JPEGStream = require('./lib/jpegstream')
const { DOMPoint, DOMMatrix } = require('./lib/DOMMatrix')
bindings.setDOMMatrix(DOMMatrix)
function createCanvas (width, height, type) {
return new Canvas(width, height, type)
}
function createImageData (array, width, height) {
return new bindings.ImageData(array, width, height)
}
function loadImage (src) {
return new Promise((resolve, reject) => {
const image = new Image()
function cleanup () {
image.onload = null
image.onerror = null
}
image.onload = () => { cleanup(); resolve(image) }
image.onerror = (err) => { cleanup(); reject(err) }
image.src = src
})
}
/**
* Resolve paths for registerFont. Must be called *before* creating a Canvas
* instance.
* @param src {string} Path to font file.
* @param fontFace {{family: string, weight?: string, style?: string}} Object
* specifying font information. `weight` and `style` default to `"normal"`.
*/
function registerFont (src, fontFace) {
// TODO this doesn't need to be on Canvas; it should just be a static method
// of `bindings`.
return Canvas._registerFont(fs.realpathSync(src), fontFace)
}
/**
* Unload all fonts from pango to free up memory
*/
function deregisterAllFonts () {
return Canvas._deregisterAllFonts()
}
exports.Canvas = Canvas
exports.Context2d = CanvasRenderingContext2D // Legacy/compat export
exports.CanvasRenderingContext2D = CanvasRenderingContext2D
exports.CanvasGradient = bindings.CanvasGradient
exports.CanvasPattern = CanvasPattern
exports.Image = Image
exports.ImageData = bindings.ImageData
exports.PNGStream = PNGStream
exports.PDFStream = PDFStream
exports.JPEGStream = JPEGStream
exports.DOMMatrix = DOMMatrix
exports.DOMPoint = DOMPoint
exports.registerFont = registerFont
exports.deregisterAllFonts = deregisterAllFonts
exports.createCanvas = createCanvas
exports.createImageData = createImageData
exports.loadImage = loadImage
exports.backends = bindings.Backends
/** Library version. */
exports.version = packageJson.version
/** Cairo version. */
exports.cairoVersion = bindings.cairoVersion
/** jpeglib version. */
exports.jpegVersion = bindings.jpegVersion
/** gif_lib version. */
exports.gifVersion = bindings.gifVersion ? bindings.gifVersion.replace(/[^.\d]/g, '') : undefined
/** freetype version. */
exports.freetypeVersion = bindings.freetypeVersion
/** rsvg version. */
exports.rsvgVersion = bindings.rsvgVersion
/** pango version. */
exports.pangoVersion = bindings.pangoVersion

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'use strict'
const util = require('util')
// DOMMatrix per https://drafts.fxtf.org/geometry/#DOMMatrix
class DOMPoint {
constructor (x, y, z, w) {
if (typeof x === 'object' && x !== null) {
w = x.w
z = x.z
y = x.y
x = x.x
}
this.x = typeof x === 'number' ? x : 0
this.y = typeof y === 'number' ? y : 0
this.z = typeof z === 'number' ? z : 0
this.w = typeof w === 'number' ? w : 1
}
matrixTransform(init) {
// TODO: this next line is wrong. matrixTransform is supposed to only take
// an object with the DOMMatrix properties called DOMMatrixInit
const m = init instanceof DOMMatrix ? init : new DOMMatrix(init)
return m.transformPoint(this)
}
toJSON() {
return {
x: this.x,
y: this.y,
z: this.z,
w: this.w
}
}
static fromPoint(other) {
return new this(other.x, other.y, other.z, other.w)
}
}
// Constants to index into _values (col-major)
const M11 = 0; const M12 = 1; const M13 = 2; const M14 = 3
const M21 = 4; const M22 = 5; const M23 = 6; const M24 = 7
const M31 = 8; const M32 = 9; const M33 = 10; const M34 = 11
const M41 = 12; const M42 = 13; const M43 = 14; const M44 = 15
const DEGREE_PER_RAD = 180 / Math.PI
const RAD_PER_DEGREE = Math.PI / 180
function parseMatrix (init) {
let parsed = init.replace('matrix(', '')
parsed = parsed.split(',', 7) // 6 + 1 to handle too many params
if (parsed.length !== 6) throw new Error(`Failed to parse ${init}`)
parsed = parsed.map(parseFloat)
return [
parsed[0], parsed[1], 0, 0,
parsed[2], parsed[3], 0, 0,
0, 0, 1, 0,
parsed[4], parsed[5], 0, 1
]
}
function parseMatrix3d (init) {
let parsed = init.replace('matrix3d(', '')
parsed = parsed.split(',', 17) // 16 + 1 to handle too many params
if (parsed.length !== 16) throw new Error(`Failed to parse ${init}`)
return parsed.map(parseFloat)
}
function parseTransform (tform) {
const type = tform.split('(', 1)[0]
switch (type) {
case 'matrix':
return parseMatrix(tform)
case 'matrix3d':
return parseMatrix3d(tform)
// TODO This is supposed to support any CSS transform value.
default:
throw new Error(`${type} parsing not implemented`)
}
}
class DOMMatrix {
constructor (init) {
this._is2D = true
this._values = new Float64Array([
1, 0, 0, 0,
0, 1, 0, 0,
0, 0, 1, 0,
0, 0, 0, 1
])
let i
if (typeof init === 'string') { // parse CSS transformList
if (init === '') return // default identity matrix
const tforms = init.split(/\)\s+/, 20).map(parseTransform)
if (tforms.length === 0) return
init = tforms[0]
for (i = 1; i < tforms.length; i++) init = multiply(tforms[i], init)
}
i = 0
if (init && init.length === 6) {
setNumber2D(this, M11, init[i++])
setNumber2D(this, M12, init[i++])
setNumber2D(this, M21, init[i++])
setNumber2D(this, M22, init[i++])
setNumber2D(this, M41, init[i++])
setNumber2D(this, M42, init[i++])
} else if (init && init.length === 16) {
setNumber2D(this, M11, init[i++])
setNumber2D(this, M12, init[i++])
setNumber3D(this, M13, init[i++])
setNumber3D(this, M14, init[i++])
setNumber2D(this, M21, init[i++])
setNumber2D(this, M22, init[i++])
setNumber3D(this, M23, init[i++])
setNumber3D(this, M24, init[i++])
setNumber3D(this, M31, init[i++])
setNumber3D(this, M32, init[i++])
setNumber3D(this, M33, init[i++])
setNumber3D(this, M34, init[i++])
setNumber2D(this, M41, init[i++])
setNumber2D(this, M42, init[i++])
setNumber3D(this, M43, init[i++])
setNumber3D(this, M44, init[i])
} else if (init !== undefined) {
throw new TypeError('Expected string or array.')
}
}
toString () {
return this.is2D
? `matrix(${this.a}, ${this.b}, ${this.c}, ${this.d}, ${this.e}, ${this.f})`
: `matrix3d(${this._values.join(', ')})`
}
multiply (other) {
return newInstance(this._values).multiplySelf(other)
}
multiplySelf (other) {
this._values = multiply(other._values, this._values)
if (!other.is2D) this._is2D = false
return this
}
preMultiplySelf (other) {
this._values = multiply(this._values, other._values)
if (!other.is2D) this._is2D = false
return this
}
translate (tx, ty, tz) {
return newInstance(this._values).translateSelf(tx, ty, tz)
}
translateSelf (tx, ty, tz) {
if (typeof tx !== 'number') tx = 0
if (typeof ty !== 'number') ty = 0
if (typeof tz !== 'number') tz = 0
this._values = multiply([
1, 0, 0, 0,
0, 1, 0, 0,
0, 0, 1, 0,
tx, ty, tz, 1
], this._values)
if (tz !== 0) this._is2D = false
return this
}
scale (scaleX, scaleY, scaleZ, originX, originY, originZ) {
return newInstance(this._values).scaleSelf(scaleX, scaleY, scaleZ, originX, originY, originZ)
}
scale3d (scale, originX, originY, originZ) {
return newInstance(this._values).scale3dSelf(scale, originX, originY, originZ)
}
scale3dSelf (scale, originX, originY, originZ) {
return this.scaleSelf(scale, scale, scale, originX, originY, originZ)
}
/**
* @deprecated
*/
scaleNonUniform(scaleX, scaleY) {
return this.scale(scaleX, scaleY)
}
scaleSelf (scaleX, scaleY, scaleZ, originX, originY, originZ) {
// Not redundant with translate's checks because we need to negate the values later.
if (typeof originX !== 'number') originX = 0
if (typeof originY !== 'number') originY = 0
if (typeof originZ !== 'number') originZ = 0
this.translateSelf(originX, originY, originZ)
if (typeof scaleX !== 'number') scaleX = 1
if (typeof scaleY !== 'number') scaleY = scaleX
if (typeof scaleZ !== 'number') scaleZ = 1
this._values = multiply([
scaleX, 0, 0, 0,
0, scaleY, 0, 0,
0, 0, scaleZ, 0,
0, 0, 0, 1
], this._values)
this.translateSelf(-originX, -originY, -originZ)
if (scaleZ !== 1 || originZ !== 0) this._is2D = false
return this
}
rotateFromVector (x, y) {
return newInstance(this._values).rotateFromVectorSelf(x, y)
}
rotateFromVectorSelf (x, y) {
if (typeof x !== 'number') x = 0
if (typeof y !== 'number') y = 0
const theta = (x === 0 && y === 0) ? 0 : Math.atan2(y, x) * DEGREE_PER_RAD
return this.rotateSelf(theta)
}
rotate (rotX, rotY, rotZ) {
return newInstance(this._values).rotateSelf(rotX, rotY, rotZ)
}
rotateSelf (rotX, rotY, rotZ) {
if (rotY === undefined && rotZ === undefined) {
rotZ = rotX
rotX = rotY = 0
}
if (typeof rotY !== 'number') rotY = 0
if (typeof rotZ !== 'number') rotZ = 0
if (rotX !== 0 || rotY !== 0) this._is2D = false
rotX *= RAD_PER_DEGREE
rotY *= RAD_PER_DEGREE
rotZ *= RAD_PER_DEGREE
let c, s
c = Math.cos(rotZ)
s = Math.sin(rotZ)
this._values = multiply([
c, s, 0, 0,
-s, c, 0, 0,
0, 0, 1, 0,
0, 0, 0, 1
], this._values)
c = Math.cos(rotY)
s = Math.sin(rotY)
this._values = multiply([
c, 0, -s, 0,
0, 1, 0, 0,
s, 0, c, 0,
0, 0, 0, 1
], this._values)
c = Math.cos(rotX)
s = Math.sin(rotX)
this._values = multiply([
1, 0, 0, 0,
0, c, s, 0,
0, -s, c, 0,
0, 0, 0, 1
], this._values)
return this
}
rotateAxisAngle (x, y, z, angle) {
return newInstance(this._values).rotateAxisAngleSelf(x, y, z, angle)
}
rotateAxisAngleSelf (x, y, z, angle) {
if (typeof x !== 'number') x = 0
if (typeof y !== 'number') y = 0
if (typeof z !== 'number') z = 0
// Normalize axis
const length = Math.sqrt(x * x + y * y + z * z)
if (length === 0) return this
if (length !== 1) {
x /= length
y /= length
z /= length
}
angle *= RAD_PER_DEGREE
const c = Math.cos(angle)
const s = Math.sin(angle)
const t = 1 - c
const tx = t * x
const ty = t * y
// NB: This is the generic transform. If the axis is a major axis, there are
// faster transforms.
this._values = multiply([
tx * x + c, tx * y + s * z, tx * z - s * y, 0,
tx * y - s * z, ty * y + c, ty * z + s * x, 0,
tx * z + s * y, ty * z - s * x, t * z * z + c, 0,
0, 0, 0, 1
], this._values)
if (x !== 0 || y !== 0) this._is2D = false
return this
}
skewX (sx) {
return newInstance(this._values).skewXSelf(sx)
}
skewXSelf (sx) {
if (typeof sx !== 'number') return this
const t = Math.tan(sx * RAD_PER_DEGREE)
this._values = multiply([
1, 0, 0, 0,
t, 1, 0, 0,
0, 0, 1, 0,
0, 0, 0, 1
], this._values)
return this
}
skewY (sy) {
return newInstance(this._values).skewYSelf(sy)
}
skewYSelf (sy) {
if (typeof sy !== 'number') return this
const t = Math.tan(sy * RAD_PER_DEGREE)
this._values = multiply([
1, t, 0, 0,
0, 1, 0, 0,
0, 0, 1, 0,
0, 0, 0, 1
], this._values)
return this
}
flipX () {
return newInstance(multiply([
-1, 0, 0, 0,
0, 1, 0, 0,
0, 0, 1, 0,
0, 0, 0, 1
], this._values))
}
flipY () {
return newInstance(multiply([
1, 0, 0, 0,
0, -1, 0, 0,
0, 0, 1, 0,
0, 0, 0, 1
], this._values))
}
inverse () {
return newInstance(this._values).invertSelf()
}
invertSelf () {
const m = this._values
const inv = m.map(v => 0)
inv[0] = m[5] * m[10] * m[15] -
m[5] * m[11] * m[14] -
m[9] * m[6] * m[15] +
m[9] * m[7] * m[14] +
m[13] * m[6] * m[11] -
m[13] * m[7] * m[10]
inv[4] = -m[4] * m[10] * m[15] +
m[4] * m[11] * m[14] +
m[8] * m[6] * m[15] -
m[8] * m[7] * m[14] -
m[12] * m[6] * m[11] +
m[12] * m[7] * m[10]
inv[8] = m[4] * m[9] * m[15] -
m[4] * m[11] * m[13] -
m[8] * m[5] * m[15] +
m[8] * m[7] * m[13] +
m[12] * m[5] * m[11] -
m[12] * m[7] * m[9]
inv[12] = -m[4] * m[9] * m[14] +
m[4] * m[10] * m[13] +
m[8] * m[5] * m[14] -
m[8] * m[6] * m[13] -
m[12] * m[5] * m[10] +
m[12] * m[6] * m[9]
// If the determinant is zero, this matrix cannot be inverted, and all
// values should be set to NaN, with the is2D flag set to false.
const det = m[0] * inv[0] + m[1] * inv[4] + m[2] * inv[8] + m[3] * inv[12]
if (det === 0) {
this._values = m.map(v => NaN)
this._is2D = false
return this
}
inv[1] = -m[1] * m[10] * m[15] +
m[1] * m[11] * m[14] +
m[9] * m[2] * m[15] -
m[9] * m[3] * m[14] -
m[13] * m[2] * m[11] +
m[13] * m[3] * m[10]
inv[5] = m[0] * m[10] * m[15] -
m[0] * m[11] * m[14] -
m[8] * m[2] * m[15] +
m[8] * m[3] * m[14] +
m[12] * m[2] * m[11] -
m[12] * m[3] * m[10]
inv[9] = -m[0] * m[9] * m[15] +
m[0] * m[11] * m[13] +
m[8] * m[1] * m[15] -
m[8] * m[3] * m[13] -
m[12] * m[1] * m[11] +
m[12] * m[3] * m[9]
inv[13] = m[0] * m[9] * m[14] -
m[0] * m[10] * m[13] -
m[8] * m[1] * m[14] +
m[8] * m[2] * m[13] +
m[12] * m[1] * m[10] -
m[12] * m[2] * m[9]
inv[2] = m[1] * m[6] * m[15] -
m[1] * m[7] * m[14] -
m[5] * m[2] * m[15] +
m[5] * m[3] * m[14] +
m[13] * m[2] * m[7] -
m[13] * m[3] * m[6]
inv[6] = -m[0] * m[6] * m[15] +
m[0] * m[7] * m[14] +
m[4] * m[2] * m[15] -
m[4] * m[3] * m[14] -
m[12] * m[2] * m[7] +
m[12] * m[3] * m[6]
inv[10] = m[0] * m[5] * m[15] -
m[0] * m[7] * m[13] -
m[4] * m[1] * m[15] +
m[4] * m[3] * m[13] +
m[12] * m[1] * m[7] -
m[12] * m[3] * m[5]
inv[14] = -m[0] * m[5] * m[14] +
m[0] * m[6] * m[13] +
m[4] * m[1] * m[14] -
m[4] * m[2] * m[13] -
m[12] * m[1] * m[6] +
m[12] * m[2] * m[5]
inv[3] = -m[1] * m[6] * m[11] +
m[1] * m[7] * m[10] +
m[5] * m[2] * m[11] -
m[5] * m[3] * m[10] -
m[9] * m[2] * m[7] +
m[9] * m[3] * m[6]
inv[7] = m[0] * m[6] * m[11] -
m[0] * m[7] * m[10] -
m[4] * m[2] * m[11] +
m[4] * m[3] * m[10] +
m[8] * m[2] * m[7] -
m[8] * m[3] * m[6]
inv[11] = -m[0] * m[5] * m[11] +
m[0] * m[7] * m[9] +
m[4] * m[1] * m[11] -
m[4] * m[3] * m[9] -
m[8] * m[1] * m[7] +
m[8] * m[3] * m[5]
inv[15] = m[0] * m[5] * m[10] -
m[0] * m[6] * m[9] -
m[4] * m[1] * m[10] +
m[4] * m[2] * m[9] +
m[8] * m[1] * m[6] -
m[8] * m[2] * m[5]
inv.forEach((v, i) => { inv[i] = v / det })
this._values = inv
return this
}
setMatrixValue (transformList) {
const temp = new DOMMatrix(transformList)
this._values = temp._values
this._is2D = temp._is2D
return this
}
transformPoint (point) {
point = new DOMPoint(point)
const x = point.x
const y = point.y
const z = point.z
const w = point.w
const values = this._values
const nx = values[M11] * x + values[M21] * y + values[M31] * z + values[M41] * w
const ny = values[M12] * x + values[M22] * y + values[M32] * z + values[M42] * w
const nz = values[M13] * x + values[M23] * y + values[M33] * z + values[M43] * w
const nw = values[M14] * x + values[M24] * y + values[M34] * z + values[M44] * w
return new DOMPoint(nx, ny, nz, nw)
}
toFloat32Array () {
return Float32Array.from(this._values)
}
toFloat64Array () {
return this._values.slice(0)
}
static fromMatrix (init) {
if (!(init instanceof DOMMatrix)) throw new TypeError('Expected DOMMatrix')
return new DOMMatrix(init._values)
}
static fromFloat32Array (init) {
if (!(init instanceof Float32Array)) throw new TypeError('Expected Float32Array')
return new DOMMatrix(init)
}
static fromFloat64Array (init) {
if (!(init instanceof Float64Array)) throw new TypeError('Expected Float64Array')
return new DOMMatrix(init)
}
[util.inspect.custom || 'inspect'] (depth, options) {
if (depth < 0) return '[DOMMatrix]'
return `DOMMatrix [
a: ${this.a}
b: ${this.b}
c: ${this.c}
d: ${this.d}
e: ${this.e}
f: ${this.f}
m11: ${this.m11}
m12: ${this.m12}
m13: ${this.m13}
m14: ${this.m14}
m21: ${this.m21}
m22: ${this.m22}
m23: ${this.m23}
m23: ${this.m23}
m31: ${this.m31}
m32: ${this.m32}
m33: ${this.m33}
m34: ${this.m34}
m41: ${this.m41}
m42: ${this.m42}
m43: ${this.m43}
m44: ${this.m44}
is2D: ${this.is2D}
isIdentity: ${this.isIdentity} ]`
}
}
/**
* Checks that `value` is a number and sets the value.
*/
function setNumber2D (receiver, index, value) {
if (typeof value !== 'number') throw new TypeError('Expected number')
return (receiver._values[index] = value)
}
/**
* Checks that `value` is a number, sets `_is2D = false` if necessary and sets
* the value.
*/
function setNumber3D (receiver, index, value) {
if (typeof value !== 'number') throw new TypeError('Expected number')
if (index === M33 || index === M44) {
if (value !== 1) receiver._is2D = false
} else if (value !== 0) receiver._is2D = false
return (receiver._values[index] = value)
}
Object.defineProperties(DOMMatrix.prototype, {
m11: { get () { return this._values[M11] }, set (v) { return setNumber2D(this, M11, v) } },
m12: { get () { return this._values[M12] }, set (v) { return setNumber2D(this, M12, v) } },
m13: { get () { return this._values[M13] }, set (v) { return setNumber3D(this, M13, v) } },
m14: { get () { return this._values[M14] }, set (v) { return setNumber3D(this, M14, v) } },
m21: { get () { return this._values[M21] }, set (v) { return setNumber2D(this, M21, v) } },
m22: { get () { return this._values[M22] }, set (v) { return setNumber2D(this, M22, v) } },
m23: { get () { return this._values[M23] }, set (v) { return setNumber3D(this, M23, v) } },
m24: { get () { return this._values[M24] }, set (v) { return setNumber3D(this, M24, v) } },
m31: { get () { return this._values[M31] }, set (v) { return setNumber3D(this, M31, v) } },
m32: { get () { return this._values[M32] }, set (v) { return setNumber3D(this, M32, v) } },
m33: { get () { return this._values[M33] }, set (v) { return setNumber3D(this, M33, v) } },
m34: { get () { return this._values[M34] }, set (v) { return setNumber3D(this, M34, v) } },
m41: { get () { return this._values[M41] }, set (v) { return setNumber2D(this, M41, v) } },
m42: { get () { return this._values[M42] }, set (v) { return setNumber2D(this, M42, v) } },
m43: { get () { return this._values[M43] }, set (v) { return setNumber3D(this, M43, v) } },
m44: { get () { return this._values[M44] }, set (v) { return setNumber3D(this, M44, v) } },
a: { get () { return this.m11 }, set (v) { return (this.m11 = v) } },
b: { get () { return this.m12 }, set (v) { return (this.m12 = v) } },
c: { get () { return this.m21 }, set (v) { return (this.m21 = v) } },
d: { get () { return this.m22 }, set (v) { return (this.m22 = v) } },
e: { get () { return this.m41 }, set (v) { return (this.m41 = v) } },
f: { get () { return this.m42 }, set (v) { return (this.m42 = v) } },
is2D: { get () { return this._is2D } }, // read-only
isIdentity: {
get () {
const values = this._values
return (values[M11] === 1 && values[M12] === 0 && values[M13] === 0 && values[M14] === 0 &&
values[M21] === 0 && values[M22] === 1 && values[M23] === 0 && values[M24] === 0 &&
values[M31] === 0 && values[M32] === 0 && values[M33] === 1 && values[M34] === 0 &&
values[M41] === 0 && values[M42] === 0 && values[M43] === 0 && values[M44] === 1)
}
},
toJSON: {
value() {
return {
a: this.a,
b: this.b,
c: this.c,
d: this.d,
e: this.e,
f: this.f,
m11: this.m11,
m12: this.m12,
m13: this.m13,
m14: this.m14,
m21: this.m21,
m22: this.m22,
m23: this.m23,
m23: this.m23,
m31: this.m31,
m32: this.m32,
m33: this.m33,
m34: this.m34,
m41: this.m41,
m42: this.m42,
m43: this.m43,
m44: this.m44,
is2D: this.is2D,
isIdentity: this.isIdentity,
}
}
}
})
/**
* Instantiates a DOMMatrix, bypassing the constructor.
* @param {Float64Array} values Value to assign to `_values`. This is assigned
* without copying (okay because all usages are followed by a multiply).
*/
function newInstance (values) {
const instance = Object.create(DOMMatrix.prototype)
instance.constructor = DOMMatrix
instance._is2D = true
instance._values = values
return instance
}
function multiply (A, B) {
const dest = new Float64Array(16)
for (let i = 0; i < 4; i++) {
for (let j = 0; j < 4; j++) {
let sum = 0
for (let k = 0; k < 4; k++) {
sum += A[i * 4 + k] * B[k * 4 + j]
}
dest[i * 4 + j] = sum
}
}
return dest
}
module.exports = { DOMMatrix, DOMPoint }

43
node_modules/canvas/lib/bindings.js generated vendored Normal file
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'use strict'
const bindings = require('../build/Release/canvas.node')
module.exports = bindings
Object.defineProperty(bindings.Canvas.prototype, Symbol.toStringTag, {
value: 'HTMLCanvasElement',
configurable: true
})
Object.defineProperty(bindings.Image.prototype, Symbol.toStringTag, {
value: 'HTMLImageElement',
configurable: true
})
bindings.ImageData.prototype.toString = function () {
return '[object ImageData]'
}
Object.defineProperty(bindings.ImageData.prototype, Symbol.toStringTag, {
value: 'ImageData',
configurable: true
})
bindings.CanvasGradient.prototype.toString = function () {
return '[object CanvasGradient]'
}
Object.defineProperty(bindings.CanvasGradient.prototype, Symbol.toStringTag, {
value: 'CanvasGradient',
configurable: true
})
Object.defineProperty(bindings.CanvasPattern.prototype, Symbol.toStringTag, {
value: 'CanvasPattern',
configurable: true
})
Object.defineProperty(bindings.CanvasRenderingContext2d.prototype, Symbol.toStringTag, {
value: 'CanvasRenderingContext2d',
configurable: true
})

113
node_modules/canvas/lib/canvas.js generated vendored Normal file
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'use strict'
/*!
* Canvas
* Copyright (c) 2010 LearnBoost <tj@learnboost.com>
* MIT Licensed
*/
const bindings = require('./bindings')
const Canvas = module.exports = bindings.Canvas
const Context2d = require('./context2d')
const PNGStream = require('./pngstream')
const PDFStream = require('./pdfstream')
const JPEGStream = require('./jpegstream')
const FORMATS = ['image/png', 'image/jpeg']
const util = require('util')
// TODO || is for Node.js pre-v6.6.0
Canvas.prototype[util.inspect.custom || 'inspect'] = function () {
return `[Canvas ${this.width}x${this.height}]`
}
Canvas.prototype.getContext = function (contextType, contextAttributes) {
if (contextType == '2d') {
const ctx = this._context2d || (this._context2d = new Context2d(this, contextAttributes))
this.context = ctx
ctx.canvas = this
return ctx
}
}
Canvas.prototype.pngStream =
Canvas.prototype.createPNGStream = function (options) {
return new PNGStream(this, options)
}
Canvas.prototype.pdfStream =
Canvas.prototype.createPDFStream = function (options) {
return new PDFStream(this, options)
}
Canvas.prototype.jpegStream =
Canvas.prototype.createJPEGStream = function (options) {
return new JPEGStream(this, options)
}
Canvas.prototype.toDataURL = function (a1, a2, a3) {
// valid arg patterns (args -> [type, opts, fn]):
// [] -> ['image/png', null, null]
// [qual] -> ['image/png', null, null]
// [undefined] -> ['image/png', null, null]
// ['image/png'] -> ['image/png', null, null]
// ['image/png', qual] -> ['image/png', null, null]
// [fn] -> ['image/png', null, fn]
// [type, fn] -> [type, null, fn]
// [undefined, fn] -> ['image/png', null, fn]
// ['image/png', qual, fn] -> ['image/png', null, fn]
// ['image/jpeg', fn] -> ['image/jpeg', null, fn]
// ['image/jpeg', opts, fn] -> ['image/jpeg', opts, fn]
// ['image/jpeg', qual, fn] -> ['image/jpeg', {quality: qual}, fn]
// ['image/jpeg', undefined, fn] -> ['image/jpeg', null, fn]
// ['image/jpeg'] -> ['image/jpeg', null, fn]
// ['image/jpeg', opts] -> ['image/jpeg', opts, fn]
// ['image/jpeg', qual] -> ['image/jpeg', {quality: qual}, fn]
let type = 'image/png'
let opts = {}
let fn
if (typeof a1 === 'function') {
fn = a1
} else {
if (typeof a1 === 'string' && FORMATS.includes(a1.toLowerCase())) {
type = a1.toLowerCase()
}
if (typeof a2 === 'function') {
fn = a2
} else {
if (typeof a2 === 'object') {
opts = a2
} else if (typeof a2 === 'number') {
opts = { quality: Math.max(0, Math.min(1, a2)) }
}
if (typeof a3 === 'function') {
fn = a3
} else if (undefined !== a3) {
throw new TypeError(`${typeof a3} is not a function`)
}
}
}
if (this.width === 0 || this.height === 0) {
// Per spec, if the bitmap has no pixels, return this string:
const str = 'data:,'
if (fn) {
setTimeout(() => fn(null, str))
return
} else {
return str
}
}
if (fn) {
this.toBuffer((err, buf) => {
if (err) return fn(err)
fn(null, `data:${type};base64,${buf.toString('base64')}`)
}, type, opts)
} else {
return `data:${type};base64,${this.toBuffer(type, opts).toString('base64')}`
}
}

11
node_modules/canvas/lib/context2d.js generated vendored Normal file
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@@ -0,0 +1,11 @@
'use strict'
/*!
* Canvas - Context2d
* Copyright (c) 2010 LearnBoost <tj@learnboost.com>
* MIT Licensed
*/
const bindings = require('./bindings')
module.exports = bindings.CanvasRenderingContext2d

93
node_modules/canvas/lib/image.js generated vendored Normal file
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@@ -0,0 +1,93 @@
'use strict'
/*!
* Canvas - Image
* Copyright (c) 2010 LearnBoost <tj@learnboost.com>
* MIT Licensed
*/
/**
* Module dependencies.
*/
const bindings = require('./bindings')
const Image = module.exports = bindings.Image
const util = require('util')
const { GetSource, SetSource } = bindings
Object.defineProperty(Image.prototype, 'src', {
/**
* src setter. Valid values:
* * `data:` URI
* * Local file path
* * HTTP or HTTPS URL
* * Buffer containing image data (i.e. not a `data:` URI stored in a Buffer)
*
* @param {String|Buffer} val filename, buffer, data URI, URL
* @api public
*/
set (val) {
if (typeof val === 'string') {
if (/^\s*data:/.test(val)) { // data: URI
const commaI = val.indexOf(',')
// 'base64' must come before the comma
const isBase64 = val.lastIndexOf('base64', commaI) !== -1
const content = val.slice(commaI + 1)
setSource(this, Buffer.from(content, isBase64 ? 'base64' : 'utf8'), val)
} else if (/^\s*https?:\/\//.test(val)) { // remote URL
const onerror = err => {
if (typeof this.onerror === 'function') {
this.onerror(err)
} else {
throw err
}
}
fetch(val, {
method: 'GET',
headers: { 'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.0.0 Safari/537.36' }
})
.then(res => {
if (!res.ok) {
throw new Error(`Server responded with ${res.statusCode}`)
}
return res.arrayBuffer()
})
.then(data => {
setSource(this, Buffer.from(data))
})
.catch(onerror)
} else { // local file path assumed
setSource(this, val)
}
} else if (Buffer.isBuffer(val)) {
setSource(this, val)
}
},
get () {
// TODO https://github.com/Automattic/node-canvas/issues/118
return getSource(this)
},
configurable: true
})
// TODO || is for Node.js pre-v6.6.0
Image.prototype[util.inspect.custom || 'inspect'] = function () {
return '[Image' +
(this.complete ? ':' + this.width + 'x' + this.height : '') +
(this.src ? ' ' + this.src : '') +
(this.complete ? ' complete' : '') +
']'
}
function getSource (img) {
return img._originalSource || GetSource.call(img)
}
function setSource (img, src, origSrc) {
SetSource.call(img, src)
img._originalSource = origSrc
}

41
node_modules/canvas/lib/jpegstream.js generated vendored Normal file
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'use strict'
/*!
* Canvas - JPEGStream
* Copyright (c) 2010 LearnBoost <tj@learnboost.com>
* MIT Licensed
*/
const { Readable } = require('stream')
function noop () {}
class JPEGStream extends Readable {
constructor (canvas, options) {
super()
if (canvas.streamJPEGSync === undefined) {
throw new Error('node-canvas was built without JPEG support.')
}
this.options = options
this.canvas = canvas
}
_read () {
// For now we're not controlling the c++ code's data emission, so we only
// call canvas.streamJPEGSync once and let it emit data at will.
this._read = noop
this.canvas.streamJPEGSync(this.options, (err, chunk) => {
if (err) {
this.emit('error', err)
} else if (chunk) {
this.push(chunk)
} else {
this.push(null)
}
})
}
};
module.exports = JPEGStream

15
node_modules/canvas/lib/pattern.js generated vendored Normal file
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@@ -0,0 +1,15 @@
'use strict'
/*!
* Canvas - CanvasPattern
* Copyright (c) 2010 LearnBoost <tj@learnboost.com>
* MIT Licensed
*/
const bindings = require('./bindings')
module.exports = bindings.CanvasPattern
bindings.CanvasPattern.prototype.toString = function () {
return '[object CanvasPattern]'
}

35
node_modules/canvas/lib/pdfstream.js generated vendored Normal file
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@@ -0,0 +1,35 @@
'use strict'
/*!
* Canvas - PDFStream
*/
const { Readable } = require('stream')
function noop () {}
class PDFStream extends Readable {
constructor (canvas, options) {
super()
this.canvas = canvas
this.options = options
}
_read () {
// For now we're not controlling the c++ code's data emission, so we only
// call canvas.streamPDFSync once and let it emit data at will.
this._read = noop
this.canvas.streamPDFSync((err, chunk, len) => {
if (err) {
this.emit('error', err)
} else if (len) {
this.push(chunk)
} else {
this.push(null)
}
}, this.options)
}
}
module.exports = PDFStream

42
node_modules/canvas/lib/pngstream.js generated vendored Normal file
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@@ -0,0 +1,42 @@
'use strict'
/*!
* Canvas - PNGStream
* Copyright (c) 2010 LearnBoost <tj@learnboost.com>
* MIT Licensed
*/
const { Readable } = require('stream')
function noop () {}
class PNGStream extends Readable {
constructor (canvas, options) {
super()
if (options &&
options.palette instanceof Uint8ClampedArray &&
options.palette.length % 4 !== 0) {
throw new Error('Palette length must be a multiple of 4.')
}
this.canvas = canvas
this.options = options || {}
}
_read () {
// For now we're not controlling the c++ code's data emission, so we only
// call canvas.streamPNGSync once and let it emit data at will.
this._read = noop
this.canvas.streamPNGSync((err, chunk, len) => {
if (err) {
this.emit('error', err)
} else if (len) {
this.push(chunk)
} else {
this.push(null)
}
}, this.options)
}
}
module.exports = PNGStream

69
node_modules/canvas/package.json generated vendored Normal file
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{
"name": "canvas",
"description": "Canvas graphics API backed by Cairo",
"version": "3.1.0",
"author": "TJ Holowaychuk <tj@learnboost.com>",
"main": "index.js",
"browser": "browser.js",
"types": "index.d.ts",
"contributors": [
"Nathan Rajlich <nathan@tootallnate.net>",
"Rod Vagg <r@va.gg>",
"Juriy Zaytsev <kangax@gmail.com>"
],
"keywords": [
"canvas",
"graphic",
"graphics",
"pixman",
"cairo",
"image",
"images",
"pdf"
],
"homepage": "https://github.com/Automattic/node-canvas",
"repository": "git://github.com/Automattic/node-canvas.git",
"scripts": {
"prebenchmark": "node-gyp build",
"benchmark": "node benchmarks/run.js",
"lint": "standard examples/*.js test/server.js test/public/*.js benchmarks/run.js lib/context2d.js util/has_lib.js browser.js index.js",
"test": "mocha test/*.test.js",
"pretest-server": "node-gyp build",
"test-server": "node test/server.js",
"generate-wpt": "node ./test/wpt/generate.js",
"test-wpt": "mocha test/wpt/generated/*.js",
"install": "prebuild-install -r napi || node-gyp rebuild",
"tsd": "tsd"
},
"files": [
"binding.gyp",
"browser.js",
"index.d.ts",
"index.js",
"lib/",
"src/",
"util/"
],
"dependencies": {
"node-addon-api": "^7.0.0",
"prebuild-install": "^7.1.1"
},
"devDependencies": {
"@types/node": "^10.12.18",
"assert-rejects": "^1.0.0",
"express": "^4.16.3",
"js-yaml": "^4.1.0",
"mocha": "^5.2.0",
"pixelmatch": "^4.0.2",
"standard": "^12.0.1",
"tsd": "^0.29.0",
"typescript": "^4.2.2"
},
"engines": {
"node": "^18.12.0 || >= 20.9.0"
},
"binary": {
"napi_versions": [7]
},
"license": "MIT"
}

18
node_modules/canvas/src/Backends.cc generated vendored Normal file
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#include "Backends.h"
#include "backend/ImageBackend.h"
#include "backend/PdfBackend.h"
#include "backend/SvgBackend.h"
using namespace Napi;
void
Backends::Initialize(Napi::Env env, Napi::Object exports) {
Napi::Object obj = Napi::Object::New(env);
ImageBackend::Initialize(obj);
PdfBackend::Initialize(obj);
SvgBackend::Initialize(obj);
exports.Set("Backends", obj);
}

9
node_modules/canvas/src/Backends.h generated vendored Normal file
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#pragma once
#include "backend/Backend.h"
#include <napi.h>
class Backends : public Napi::ObjectWrap<Backends> {
public:
static void Initialize(Napi::Env env, Napi::Object exports);
};

938
node_modules/canvas/src/Canvas.cc generated vendored Normal file
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// Copyright (c) 2010 LearnBoost <tj@learnboost.com>
#include "Canvas.h"
#include "InstanceData.h"
#include <algorithm> // std::min
#include <assert.h>
#include <cairo-pdf.h>
#include <cairo-svg.h>
#include "CanvasRenderingContext2d.h"
#include "closure.h"
#include <cstring>
#include <cctype>
#include <ctime>
#include <glib.h>
#include "PNG.h"
#include "register_font.h"
#include <sstream>
#include <stdlib.h>
#include <string>
#include <unordered_set>
#include "Util.h"
#include <vector>
#include "node_buffer.h"
#include "FontParser.h"
#ifdef HAVE_JPEG
#include "JPEGStream.h"
#endif
#include "backend/ImageBackend.h"
#include "backend/PdfBackend.h"
#include "backend/SvgBackend.h"
#define GENERIC_FACE_ERROR \
"The second argument to registerFont is required, and should be an object " \
"with at least a family (string) and optionally weight (string/number) " \
"and style (string)."
using namespace std;
std::vector<FontFace> Canvas::font_face_list;
// Increases each time a font is (de)registered
int Canvas::fontSerial = 1;
/*
* Initialize Canvas.
*/
void
Canvas::Initialize(Napi::Env& env, Napi::Object& exports) {
Napi::HandleScope scope(env);
InstanceData* data = env.GetInstanceData<InstanceData>();
// Constructor
Napi::Function ctor = DefineClass(env, "Canvas", {
InstanceMethod<&Canvas::ToBuffer>("toBuffer", napi_default_method),
InstanceMethod<&Canvas::StreamPNGSync>("streamPNGSync", napi_default_method),
InstanceMethod<&Canvas::StreamPDFSync>("streamPDFSync", napi_default_method),
#ifdef HAVE_JPEG
InstanceMethod<&Canvas::StreamJPEGSync>("streamJPEGSync", napi_default_method),
#endif
InstanceAccessor<&Canvas::GetType>("type", napi_default_jsproperty),
InstanceAccessor<&Canvas::GetStride>("stride", napi_default_jsproperty),
InstanceAccessor<&Canvas::GetWidth, &Canvas::SetWidth>("width", napi_default_jsproperty),
InstanceAccessor<&Canvas::GetHeight, &Canvas::SetHeight>("height", napi_default_jsproperty),
StaticValue("PNG_NO_FILTERS", Napi::Number::New(env, PNG_NO_FILTERS), napi_default_jsproperty),
StaticValue("PNG_FILTER_NONE", Napi::Number::New(env, PNG_FILTER_NONE), napi_default_jsproperty),
StaticValue("PNG_FILTER_SUB", Napi::Number::New(env, PNG_FILTER_SUB), napi_default_jsproperty),
StaticValue("PNG_FILTER_UP", Napi::Number::New(env, PNG_FILTER_UP), napi_default_jsproperty),
StaticValue("PNG_FILTER_AVG", Napi::Number::New(env, PNG_FILTER_AVG), napi_default_jsproperty),
StaticValue("PNG_FILTER_PAETH", Napi::Number::New(env, PNG_FILTER_PAETH), napi_default_jsproperty),
StaticValue("PNG_ALL_FILTERS", Napi::Number::New(env, PNG_ALL_FILTERS), napi_default_jsproperty),
StaticMethod<&Canvas::RegisterFont>("_registerFont", napi_default_method),
StaticMethod<&Canvas::DeregisterAllFonts>("_deregisterAllFonts", napi_default_method),
StaticMethod<&Canvas::ParseFont>("parseFont", napi_default_method)
});
data->CanvasCtor = Napi::Persistent(ctor);
exports.Set("Canvas", ctor);
}
/*
* Initialize a Canvas with the given width and height.
*/
Canvas::Canvas(const Napi::CallbackInfo& info) : Napi::ObjectWrap<Canvas>(info), env(info.Env()) {
InstanceData* data = env.GetInstanceData<InstanceData>();
ctor = Napi::Persistent(data->CanvasCtor.Value());
Backend* backend = NULL;
Napi::Object jsBackend;
if (info[0].IsNumber()) {
Napi::Number width = info[0].As<Napi::Number>();
Napi::Number height = Napi::Number::New(env, 0);
if (info[1].IsNumber()) height = info[1].As<Napi::Number>();
if (info[2].IsString()) {
std::string str = info[2].As<Napi::String>();
if (str == "pdf") {
Napi::Maybe<Napi::Object> instance = data->PdfBackendCtor.New({ width, height });
if (instance.IsJust()) backend = PdfBackend::Unwrap(jsBackend = instance.Unwrap());
} else if (str == "svg") {
Napi::Maybe<Napi::Object> instance = data->SvgBackendCtor.New({ width, height });
if (instance.IsJust()) backend = SvgBackend::Unwrap(jsBackend = instance.Unwrap());
} else {
Napi::Maybe<Napi::Object> instance = data->ImageBackendCtor.New({ width, height });
if (instance.IsJust()) backend = ImageBackend::Unwrap(jsBackend = instance.Unwrap());
}
} else {
Napi::Maybe<Napi::Object> instance = data->ImageBackendCtor.New({ width, height });
if (instance.IsJust()) backend = ImageBackend::Unwrap(jsBackend = instance.Unwrap());
}
} else if (info[0].IsObject()) {
jsBackend = info[0].As<Napi::Object>();
if (jsBackend.InstanceOf(data->ImageBackendCtor.Value()).UnwrapOr(false)) {
backend = ImageBackend::Unwrap(jsBackend);
} else if (jsBackend.InstanceOf(data->PdfBackendCtor.Value()).UnwrapOr(false)) {
backend = PdfBackend::Unwrap(jsBackend);
} else if (jsBackend.InstanceOf(data->SvgBackendCtor.Value()).UnwrapOr(false)) {
backend = SvgBackend::Unwrap(jsBackend);
} else {
Napi::TypeError::New(env, "Invalid arguments").ThrowAsJavaScriptException();
return;
}
} else {
Napi::Number width = Napi::Number::New(env, 0);
Napi::Number height = Napi::Number::New(env, 0);
Napi::Maybe<Napi::Object> instance = data->ImageBackendCtor.New({ width, height });
if (instance.IsJust()) backend = ImageBackend::Unwrap(jsBackend = instance.Unwrap());
}
if (!backend->isSurfaceValid()) {
Napi::Error::New(env, backend->getError()).ThrowAsJavaScriptException();
return;
}
backend->setCanvas(this);
// Note: the backend gets destroyed when the jsBackend is GC'd. The cleaner
// way would be to only store the jsBackend and unwrap it when the c++ ref is
// needed, but that's slower and a burden. The _backend might be null if we
// returned early, but since an exception was thrown it gets destroyed soon.
_backend = backend;
_jsBackend = Napi::Persistent(jsBackend);
}
/*
* Get type string.
*/
Napi::Value
Canvas::GetType(const Napi::CallbackInfo& info) {
return Napi::String::New(env, backend()->getName());
}
/*
* Get stride.
*/
Napi::Value
Canvas::GetStride(const Napi::CallbackInfo& info) {
return Napi::Number::New(env, stride());
}
/*
* Get width.
*/
Napi::Value
Canvas::GetWidth(const Napi::CallbackInfo& info) {
return Napi::Number::New(env, getWidth());
}
/*
* Set width.
*/
void
Canvas::SetWidth(const Napi::CallbackInfo& info, const Napi::Value& value) {
if (value.IsNumber()) {
backend()->setWidth(value.As<Napi::Number>().Uint32Value());
resurface(info.This().As<Napi::Object>());
}
}
/*
* Get height.
*/
Napi::Value
Canvas::GetHeight(const Napi::CallbackInfo& info) {
return Napi::Number::New(env, getHeight());
}
/*
* Set height.
*/
void
Canvas::SetHeight(const Napi::CallbackInfo& info, const Napi::Value& value) {
if (value.IsNumber()) {
backend()->setHeight(value.As<Napi::Number>().Uint32Value());
resurface(info.This().As<Napi::Object>());
}
}
/*
* EIO toBuffer callback.
*/
void
Canvas::ToPngBufferAsync(Closure* base) {
PngClosure* closure = static_cast<PngClosure*>(base);
closure->status = canvas_write_to_png_stream(
closure->canvas->surface(),
PngClosure::writeVec,
closure);
}
#ifdef HAVE_JPEG
void
Canvas::ToJpegBufferAsync(Closure* base) {
JpegClosure* closure = static_cast<JpegClosure*>(base);
write_to_jpeg_buffer(closure->canvas->surface(), closure);
}
#endif
static void
parsePNGArgs(Napi::Value arg, PngClosure& pngargs) {
if (arg.IsObject()) {
Napi::Object obj = arg.As<Napi::Object>();
Napi::Value cLevel;
if (obj.Get("compressionLevel").UnwrapTo(&cLevel) && cLevel.IsNumber()) {
uint32_t val = cLevel.As<Napi::Number>().Uint32Value();
// See quote below from spec section 4.12.5.5.
if (val <= 9) pngargs.compressionLevel = val;
}
Napi::Value rez;
if (obj.Get("resolution").UnwrapTo(&rez) && rez.IsNumber()) {
uint32_t val = rez.As<Napi::Number>().Uint32Value();
if (val > 0) pngargs.resolution = val;
}
Napi::Value filters;
if (obj.Get("filters").UnwrapTo(&filters) && filters.IsNumber()) {
pngargs.filters = filters.As<Napi::Number>().Uint32Value();
}
Napi::Value palette;
if (obj.Get("palette").UnwrapTo(&palette) && palette.IsTypedArray()) {
Napi::TypedArray palette_ta = palette.As<Napi::TypedArray>();
if (palette_ta.TypedArrayType() == napi_uint8_clamped_array) {
pngargs.nPaletteColors = palette_ta.ElementLength();
if (pngargs.nPaletteColors % 4 != 0) {
throw "Palette length must be a multiple of 4.";
}
pngargs.palette = palette_ta.As<Napi::Uint8Array>().Data();
pngargs.nPaletteColors /= 4;
// Optional background color index:
Napi::Value backgroundIndexVal;
if (obj.Get("backgroundIndex").UnwrapTo(&backgroundIndexVal) && backgroundIndexVal.IsNumber()) {
pngargs.backgroundIndex = backgroundIndexVal.As<Napi::Number>().Uint32Value();
}
}
}
}
}
#ifdef HAVE_JPEG
static void parseJPEGArgs(Napi::Value arg, JpegClosure& jpegargs) {
// "If Type(quality) is not Number, or if quality is outside that range, the
// user agent must use its default quality value, as if the quality argument
// had not been given." - 4.12.5.5
if (arg.IsObject()) {
Napi::Object obj = arg.As<Napi::Object>();
Napi::Value qual;
if (obj.Get("quality").UnwrapTo(&qual) && qual.IsNumber()) {
double quality = qual.As<Napi::Number>().DoubleValue();
if (quality >= 0.0 && quality <= 1.0) {
jpegargs.quality = static_cast<uint32_t>(100.0 * quality);
}
}
Napi::Value chroma;
if (obj.Get("chromaSubsampling").UnwrapTo(&chroma)) {
if (chroma.IsBoolean()) {
bool subsample = chroma.As<Napi::Boolean>().Value();
jpegargs.chromaSubsampling = subsample ? 2 : 1;
} else if (chroma.IsNumber()) {
jpegargs.chromaSubsampling = chroma.As<Napi::Number>().Uint32Value();
}
}
Napi::Value progressive;
if (obj.Get("progressive").UnwrapTo(&progressive) && progressive.IsBoolean()) {
jpegargs.progressive = progressive.As<Napi::Boolean>().Value();
}
}
}
#endif
#if CAIRO_VERSION >= CAIRO_VERSION_ENCODE(1, 16, 0)
static inline void setPdfMetaStr(cairo_surface_t* surf, Napi::Object opts,
cairo_pdf_metadata_t t, const char* propName) {
Napi::Value propValue;
if (opts.Get(propName).UnwrapTo(&propValue) && propValue.IsString()) {
// (copies char data)
cairo_pdf_surface_set_metadata(surf, t, propValue.As<Napi::String>().Utf8Value().c_str());
}
}
static inline void setPdfMetaDate(cairo_surface_t* surf, Napi::Object opts,
cairo_pdf_metadata_t t, const char* propName) {
Napi::Value propValue;
if (opts.Get(propName).UnwrapTo(&propValue) && propValue.IsDate()) {
auto date = static_cast<time_t>(propValue.As<Napi::Date>().ValueOf() / 1000); // ms -> s
char buf[sizeof "2011-10-08T07:07:09Z"];
strftime(buf, sizeof buf, "%FT%TZ", gmtime(&date));
cairo_pdf_surface_set_metadata(surf, t, buf);
}
}
static void setPdfMetadata(Canvas* canvas, Napi::Object opts) {
cairo_surface_t* surf = canvas->surface();
setPdfMetaStr(surf, opts, CAIRO_PDF_METADATA_TITLE, "title");
setPdfMetaStr(surf, opts, CAIRO_PDF_METADATA_AUTHOR, "author");
setPdfMetaStr(surf, opts, CAIRO_PDF_METADATA_SUBJECT, "subject");
setPdfMetaStr(surf, opts, CAIRO_PDF_METADATA_KEYWORDS, "keywords");
setPdfMetaStr(surf, opts, CAIRO_PDF_METADATA_CREATOR, "creator");
setPdfMetaDate(surf, opts, CAIRO_PDF_METADATA_CREATE_DATE, "creationDate");
setPdfMetaDate(surf, opts, CAIRO_PDF_METADATA_MOD_DATE, "modDate");
}
#endif // CAIRO 16+
/*
* Converts/encodes data to a Buffer. Async when a callback function is passed.
* PDF canvases:
(any) => Buffer
("application/pdf", config) => Buffer
* SVG canvases:
(any) => Buffer
* ARGB data:
("raw") => Buffer
* PNG-encoded
() => Buffer
(undefined|"image/png", {compressionLevel?: number, filter?: number}) => Buffer
((err: null|Error, buffer) => any)
((err: null|Error, buffer) => any, undefined|"image/png", {compressionLevel?: number, filter?: number})
* JPEG-encoded
("image/jpeg") => Buffer
("image/jpeg", {quality?: number, progressive?: Boolean, chromaSubsampling?: Boolean|number}) => Buffer
((err: null|Error, buffer) => any, "image/jpeg")
((err: null|Error, buffer) => any, "image/jpeg", {quality?: number, progressive?: Boolean, chromaSubsampling?: Boolean|number})
*/
Napi::Value
Canvas::ToBuffer(const Napi::CallbackInfo& info) {
EncodingWorker *worker = new EncodingWorker(info.Env());
cairo_status_t status;
// Vector canvases, sync only
const std::string name = backend()->getName();
if (name == "pdf" || name == "svg") {
// mime type may be present, but it's not checked
PdfSvgClosure* closure;
if (name == "pdf") {
closure = static_cast<PdfBackend*>(backend())->closure();
#if CAIRO_VERSION >= CAIRO_VERSION_ENCODE(1, 16, 0)
if (info[1].IsObject()) { // toBuffer("application/pdf", config)
setPdfMetadata(this, info[1].As<Napi::Object>());
}
#endif // CAIRO 16+
} else {
closure = static_cast<SvgBackend*>(backend())->closure();
}
cairo_surface_t *surf = surface();
cairo_surface_finish(surf);
cairo_status_t status = cairo_surface_status(surf);
if (status != CAIRO_STATUS_SUCCESS) {
Napi::Error::New(env, cairo_status_to_string(status)).ThrowAsJavaScriptException();
return env.Undefined();
}
return Napi::Buffer<uint8_t>::Copy(env, &closure->vec[0], closure->vec.size());
}
// Raw ARGB data -- just a memcpy()
if (info[0].StrictEquals(Napi::String::New(env, "raw"))) {
cairo_surface_t *surface = this->surface();
cairo_surface_flush(surface);
if (nBytes() > node::Buffer::kMaxLength) {
Napi::Error::New(env, "Data exceeds maximum buffer length.").ThrowAsJavaScriptException();
return env.Undefined();
}
return Napi::Buffer<uint8_t>::Copy(env, cairo_image_surface_get_data(surface), nBytes());
}
// Sync PNG, default
if (info[0].IsUndefined() || info[0].StrictEquals(Napi::String::New(env, "image/png"))) {
try {
PngClosure closure(this);
parsePNGArgs(info[1], closure);
if (closure.nPaletteColors == 0xFFFFFFFF) {
Napi::Error::New(env, "Palette length must be a multiple of 4.").ThrowAsJavaScriptException();
return env.Undefined();
}
status = canvas_write_to_png_stream(surface(), PngClosure::writeVec, &closure);
if (!env.IsExceptionPending()) {
if (status) {
throw status; // TODO: throw in js?
} else {
// TODO it's possible to avoid this copy
return Napi::Buffer<uint8_t>::Copy(env, &closure.vec[0], closure.vec.size());
}
}
} catch (cairo_status_t ex) {
CairoError(ex).ThrowAsJavaScriptException();
} catch (const char* ex) {
Napi::Error::New(env, ex).ThrowAsJavaScriptException();
}
return env.Undefined();
}
// Async PNG
if (info[0].IsFunction() &&
(info[1].IsUndefined() || info[1].StrictEquals(Napi::String::New(env, "image/png")))) {
PngClosure* closure;
try {
closure = new PngClosure(this);
parsePNGArgs(info[2], *closure);
} catch (cairo_status_t ex) {
CairoError(ex).ThrowAsJavaScriptException();
return env.Undefined();
} catch (const char* ex) {
Napi::Error::New(env, ex).ThrowAsJavaScriptException();
return env.Undefined();
}
Ref();
closure->cb = Napi::Persistent(info[0].As<Napi::Function>());
// Make sure the surface exists since we won't have an isolate context in the async block:
surface();
worker->Init(&ToPngBufferAsync, closure);
worker->Queue();
return env.Undefined();
}
#ifdef HAVE_JPEG
// Sync JPEG
Napi::Value jpegStr = Napi::String::New(env, "image/jpeg");
if (info[0].StrictEquals(jpegStr)) {
try {
JpegClosure closure(this);
parseJPEGArgs(info[1], closure);
write_to_jpeg_buffer(surface(), &closure);
if (!env.IsExceptionPending()) {
// TODO it's possible to avoid this copy.
return Napi::Buffer<uint8_t>::Copy(env, &closure.vec[0], closure.vec.size());
}
} catch (cairo_status_t ex) {
CairoError(ex).ThrowAsJavaScriptException();
return env.Undefined();
}
return env.Undefined();
}
// Async JPEG
if (info[0].IsFunction() && info[1].StrictEquals(jpegStr)) {
JpegClosure* closure = new JpegClosure(this);
parseJPEGArgs(info[2], *closure);
Ref();
closure->cb = Napi::Persistent(info[0].As<Napi::Function>());
// Make sure the surface exists since we won't have an isolate context in the async block:
surface();
worker->Init(&ToJpegBufferAsync, closure);
worker->Queue();
return env.Undefined();
}
#endif
return env.Undefined();
}
/*
* Canvas::StreamPNG callback.
*/
static cairo_status_t
streamPNG(void *c, const uint8_t *data, unsigned len) {
PngClosure* closure = (PngClosure*) c;
Napi::Env env = closure->canvas->env;
Napi::HandleScope scope(env);
Napi::AsyncContext async(env, "canvas:StreamPNG");
Napi::Value buf = Napi::Buffer<uint8_t>::Copy(env, data, len);
closure->cb.MakeCallback(env.Global(), { env.Null(), buf, Napi::Number::New(env, len) }, async);
return CAIRO_STATUS_SUCCESS;
}
/*
* Stream PNG data synchronously. TODO async
* StreamPngSync(this, options: {palette?: Uint8ClampedArray, backgroundIndex?: uint32, compressionLevel: uint32, filters: uint32})
*/
void
Canvas::StreamPNGSync(const Napi::CallbackInfo& info) {
if (!info[0].IsFunction()) {
Napi::TypeError::New(env, "callback function required").ThrowAsJavaScriptException();
return;
}
PngClosure closure(this);
parsePNGArgs(info[1], closure);
closure.cb = Napi::Persistent(info[0].As<Napi::Function>());
cairo_status_t status = canvas_write_to_png_stream(surface(), streamPNG, &closure);
if (!env.IsExceptionPending()) {
if (status) {
closure.cb.Call(env.Global(), { CairoError(status).Value() });
} else {
closure.cb.Call(env.Global(), { env.Null(), env.Null(), Napi::Number::New(env, 0) });
}
}
}
struct PdfStreamInfo {
Napi::Function fn;
uint32_t len;
uint8_t* data;
};
/*
* Canvas::StreamPDF callback.
*/
static cairo_status_t
streamPDF(void *c, const uint8_t *data, unsigned len) {
PdfStreamInfo* streaminfo = static_cast<PdfStreamInfo*>(c);
Napi::Env env = streaminfo->fn.Env();
Napi::HandleScope scope(env);
Napi::AsyncContext async(env, "canvas:StreamPDF");
// TODO this is technically wrong, we're returning a pointer to the data in a
// vector in a class with automatic storage duration. If the canvas goes out
// of scope while we're in the handler, a use-after-free could happen.
Napi::Value buf = Napi::Buffer<uint8_t>::New(env, (uint8_t *)(data), len);
streaminfo->fn.MakeCallback(env.Global(), { env.Null(), buf, Napi::Number::New(env, len) }, async);
return CAIRO_STATUS_SUCCESS;
}
cairo_status_t canvas_write_to_pdf_stream(cairo_surface_t *surface, cairo_write_func_t write_func, PdfStreamInfo* streaminfo) {
size_t whole_chunks = streaminfo->len / PAGE_SIZE;
size_t remainder = streaminfo->len - whole_chunks * PAGE_SIZE;
for (size_t i = 0; i < whole_chunks; ++i) {
write_func(streaminfo, &streaminfo->data[i * PAGE_SIZE], PAGE_SIZE);
}
if (remainder) {
write_func(streaminfo, &streaminfo->data[whole_chunks * PAGE_SIZE], remainder);
}
return CAIRO_STATUS_SUCCESS;
}
/*
* Stream PDF data synchronously.
*/
void
Canvas::StreamPDFSync(const Napi::CallbackInfo& info) {
if (!info[0].IsFunction()) {
Napi::TypeError::New(env, "callback function required").ThrowAsJavaScriptException();
return;
}
if (backend()->getName() != "pdf") {
Napi::TypeError::New(env, "wrong canvas type").ThrowAsJavaScriptException();
return;
}
#if CAIRO_VERSION >= CAIRO_VERSION_ENCODE(1, 16, 0)
if (info[1].IsObject()) {
setPdfMetadata(this, info[1].As<Napi::Object>());
}
#endif
cairo_surface_finish(surface());
PdfSvgClosure* closure = static_cast<PdfBackend*>(backend())->closure();
Napi::Function fn = info[0].As<Napi::Function>();
PdfStreamInfo streaminfo;
streaminfo.fn = fn;
streaminfo.data = &closure->vec[0];
streaminfo.len = closure->vec.size();
cairo_status_t status = canvas_write_to_pdf_stream(surface(), streamPDF, &streaminfo);
if (!env.IsExceptionPending()) {
if (status) {
fn.Call(env.Global(), { CairoError(status).Value() });
} else {
fn.Call(env.Global(), { env.Null(), env.Null(), Napi::Number::New(env, 0) });
}
}
}
/*
* Stream JPEG data synchronously.
*/
#ifdef HAVE_JPEG
static uint32_t getSafeBufSize(Canvas* canvas) {
// Don't allow the buffer size to exceed the size of the canvas (#674)
// TODO not sure if this is really correct, but it fixed #674
return (std::min)(canvas->getWidth() * canvas->getHeight() * 4, static_cast<int>(PAGE_SIZE));
}
void
Canvas::StreamJPEGSync(const Napi::CallbackInfo& info) {
if (!info[1].IsFunction()) {
Napi::TypeError::New(env, "callback function required").ThrowAsJavaScriptException();
return;
}
JpegClosure closure(this);
parseJPEGArgs(info[0], closure);
closure.cb = Napi::Persistent(info[1].As<Napi::Function>());
uint32_t bufsize = getSafeBufSize(this);
write_to_jpeg_stream(surface(), bufsize, &closure);
}
#endif
char *
str_value(Napi::Maybe<Napi::Value> maybe, const char *fallback, bool can_be_number) {
Napi::Value val;
if (maybe.UnwrapTo(&val)) {
if (val.IsString() || (can_be_number && val.IsNumber())) {
Napi::String strVal;
if (val.ToString().UnwrapTo(&strVal)) return strdup(strVal.Utf8Value().c_str());
} else if (fallback) {
return strdup(fallback);
}
}
return NULL;
}
void
Canvas::RegisterFont(const Napi::CallbackInfo& info) {
Napi::Env env = info.Env();
if (!info[0].IsString()) {
Napi::Error::New(env, "Wrong argument type").ThrowAsJavaScriptException();
return;
} else if (!info[1].IsObject()) {
Napi::Error::New(env, GENERIC_FACE_ERROR).ThrowAsJavaScriptException();
return;
}
std::string filePath = info[0].As<Napi::String>();
PangoFontDescription *sys_desc = get_pango_font_description((unsigned char *)(filePath.c_str()));
if (!sys_desc) {
Napi::Error::New(env, "Could not parse font file").ThrowAsJavaScriptException();
return;
}
PangoFontDescription *user_desc = pango_font_description_new();
// now check the attrs, there are many ways to be wrong
Napi::Object js_user_desc = info[1].As<Napi::Object>();
// TODO: use FontParser on these values just like the FontFace API works
char *family = str_value(js_user_desc.Get("family"), NULL, false);
char *weight = str_value(js_user_desc.Get("weight"), "normal", true);
char *style = str_value(js_user_desc.Get("style"), "normal", false);
if (family && weight && style) {
pango_font_description_set_weight(user_desc, Canvas::GetWeightFromCSSString(weight));
pango_font_description_set_style(user_desc, Canvas::GetStyleFromCSSString(style));
pango_font_description_set_family(user_desc, family);
auto found = std::find_if(font_face_list.begin(), font_face_list.end(), [&](FontFace& f) {
return pango_font_description_equal(f.sys_desc, sys_desc);
});
if (found != font_face_list.end()) {
pango_font_description_free(found->user_desc);
found->user_desc = user_desc;
} else if (register_font((unsigned char *) filePath.c_str())) {
FontFace face;
face.user_desc = user_desc;
face.sys_desc = sys_desc;
strncpy((char *)face.file_path, (char *) filePath.c_str(), 1023);
font_face_list.push_back(face);
} else {
pango_font_description_free(user_desc);
Napi::Error::New(env, "Could not load font to the system's font host").ThrowAsJavaScriptException();
}
} else {
pango_font_description_free(user_desc);
if (!env.IsExceptionPending()) {
Napi::Error::New(env, GENERIC_FACE_ERROR).ThrowAsJavaScriptException();
}
}
free(family);
free(weight);
free(style);
fontSerial++;
}
void
Canvas::DeregisterAllFonts(const Napi::CallbackInfo& info) {
Napi::Env env = info.Env();
// Unload all fonts from pango to free up memory
bool success = true;
std::for_each(font_face_list.begin(), font_face_list.end(), [&](FontFace& f) {
if (!deregister_font( (unsigned char *)f.file_path )) success = false;
pango_font_description_free(f.user_desc);
pango_font_description_free(f.sys_desc);
});
font_face_list.clear();
fontSerial++;
if (!success) Napi::Error::New(env, "Could not deregister one or more fonts").ThrowAsJavaScriptException();
}
/*
* Do not use! This is only exported for testing
*/
Napi::Value
Canvas::ParseFont(const Napi::CallbackInfo& info) {
Napi::Env env = info.Env();
if (info.Length() != 1) return env.Undefined();
Napi::String str;
if (!info[0].ToString().UnwrapTo(&str)) return env.Undefined();
bool ok;
auto props = FontParser::parse(str, &ok);
if (!ok) return env.Undefined();
Napi::Object obj = Napi::Object::New(env);
obj.Set("size", Napi::Number::New(env, props.fontSize));
Napi::Array families = Napi::Array::New(env);
obj.Set("families", families);
unsigned int index = 0;
for (auto& family : props.fontFamily) {
families[index++] = Napi::String::New(env, family);
}
obj.Set("weight", Napi::Number::New(env, props.fontWeight));
obj.Set("variant", Napi::Number::New(env, static_cast<int>(props.fontVariant)));
obj.Set("style", Napi::Number::New(env, static_cast<int>(props.fontStyle)));
return obj;
}
/*
* Get a PangoStyle from a CSS string (like "italic")
*/
PangoStyle
Canvas::GetStyleFromCSSString(const char *style) {
PangoStyle s = PANGO_STYLE_NORMAL;
if (strlen(style) > 0) {
if (0 == strcmp("italic", style)) {
s = PANGO_STYLE_ITALIC;
} else if (0 == strcmp("oblique", style)) {
s = PANGO_STYLE_OBLIQUE;
}
}
return s;
}
/*
* Get a PangoWeight from a CSS string ("bold", "100", etc)
*/
PangoWeight
Canvas::GetWeightFromCSSString(const char *weight) {
PangoWeight w = PANGO_WEIGHT_NORMAL;
if (strlen(weight) > 0) {
if (0 == strcmp("bold", weight)) {
w = PANGO_WEIGHT_BOLD;
} else if (0 == strcmp("100", weight)) {
w = PANGO_WEIGHT_THIN;
} else if (0 == strcmp("200", weight)) {
w = PANGO_WEIGHT_ULTRALIGHT;
} else if (0 == strcmp("300", weight)) {
w = PANGO_WEIGHT_LIGHT;
} else if (0 == strcmp("400", weight)) {
w = PANGO_WEIGHT_NORMAL;
} else if (0 == strcmp("500", weight)) {
w = PANGO_WEIGHT_MEDIUM;
} else if (0 == strcmp("600", weight)) {
w = PANGO_WEIGHT_SEMIBOLD;
} else if (0 == strcmp("700", weight)) {
w = PANGO_WEIGHT_BOLD;
} else if (0 == strcmp("800", weight)) {
w = PANGO_WEIGHT_ULTRABOLD;
} else if (0 == strcmp("900", weight)) {
w = PANGO_WEIGHT_HEAVY;
}
}
return w;
}
/*
* Given a user description, return a description that will select the
* font either from the system or @font-face
*/
PangoFontDescription *
Canvas::ResolveFontDescription(const PangoFontDescription *desc) {
// One of the user-specified families could map to multiple SFNT family names
// if someone registered two different fonts under the same family name.
// https://drafts.csswg.org/css-fonts-3/#font-style-matching
FontFace best;
istringstream families(pango_font_description_get_family(desc));
unordered_set<string> seen_families;
string resolved_families;
bool first = true;
for (string family; getline(families, family, ','); ) {
string renamed_families;
for (auto& ff : font_face_list) {
string pangofamily = string(pango_font_description_get_family(ff.user_desc));
if (streq_casein(family, pangofamily)) {
const char* sys_desc_family_name = pango_font_description_get_family(ff.sys_desc);
bool unseen = seen_families.find(sys_desc_family_name) == seen_families.end();
bool better = best.user_desc == nullptr || pango_font_description_better_match(desc, best.user_desc, ff.user_desc);
// Avoid sending duplicate SFNT font names due to a bug in Pango for macOS:
// https://bugzilla.gnome.org/show_bug.cgi?id=762873
if (unseen) {
seen_families.insert(sys_desc_family_name);
if (better) {
renamed_families = string(sys_desc_family_name) + (renamed_families.size() ? "," : "") + renamed_families;
} else {
renamed_families = renamed_families + (renamed_families.size() ? "," : "") + sys_desc_family_name;
}
}
if (first && better) best = ff;
}
}
if (resolved_families.size()) resolved_families += ',';
resolved_families += renamed_families.size() ? renamed_families : family;
first = false;
}
PangoFontDescription* ret = pango_font_description_copy(best.sys_desc ? best.sys_desc : desc);
pango_font_description_set_family(ret, resolved_families.c_str());
return ret;
}
/*
* Re-alloc the surface, destroying the previous.
*/
void
Canvas::resurface(Napi::Object This) {
Napi::HandleScope scope(env);
Napi::Value context;
if (This.Get("context").UnwrapTo(&context) && context.IsObject()) {
backend()->recreateSurface();
// Reset context
Context2d *context2d = Context2d::Unwrap(context.As<Napi::Object>());
cairo_t *prev = context2d->context();
context2d->setContext(createCairoContext());
context2d->resetState();
cairo_destroy(prev);
}
}
/**
* Wrapper around cairo_create()
* (do not call cairo_create directly, call this instead)
*/
cairo_t*
Canvas::createCairoContext() {
cairo_t* ret = cairo_create(surface());
cairo_set_line_width(ret, 1); // Cairo defaults to 2
return ret;
}
/*
* Construct an Error from the given cairo status.
*/
Napi::Error
Canvas::CairoError(cairo_status_t status) {
return Napi::Error::New(env, cairo_status_to_string(status));
}

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// Copyright (c) 2010 LearnBoost <tj@learnboost.com>
#pragma once
struct Closure;
#include "backend/Backend.h"
#include "closure.h"
#include <cairo.h>
#include "dll_visibility.h"
#include <napi.h>
#include <pango/pangocairo.h>
#include <vector>
#include <cstddef>
/*
* FontFace describes a font file in terms of one PangoFontDescription that
* will resolve to it and one that the user describes it as (like @font-face)
*/
class FontFace {
public:
PangoFontDescription *sys_desc = nullptr;
PangoFontDescription *user_desc = nullptr;
unsigned char file_path[1024];
};
enum text_baseline_t : uint8_t {
TEXT_BASELINE_ALPHABETIC = 0,
TEXT_BASELINE_TOP = 1,
TEXT_BASELINE_BOTTOM = 2,
TEXT_BASELINE_MIDDLE = 3,
TEXT_BASELINE_IDEOGRAPHIC = 4,
TEXT_BASELINE_HANGING = 5
};
enum text_align_t : int8_t {
TEXT_ALIGNMENT_LEFT = -1,
TEXT_ALIGNMENT_CENTER = 0,
TEXT_ALIGNMENT_RIGHT = 1,
TEXT_ALIGNMENT_START = -2,
TEXT_ALIGNMENT_END = 2
};
enum canvas_draw_mode_t : uint8_t {
TEXT_DRAW_PATHS,
TEXT_DRAW_GLYPHS
};
/*
* Canvas.
*/
class Canvas : public Napi::ObjectWrap<Canvas> {
public:
Canvas(const Napi::CallbackInfo& info);
static void Initialize(Napi::Env& env, Napi::Object& target);
Napi::Value ToBuffer(const Napi::CallbackInfo& info);
Napi::Value GetType(const Napi::CallbackInfo& info);
Napi::Value GetStride(const Napi::CallbackInfo& info);
Napi::Value GetWidth(const Napi::CallbackInfo& info);
Napi::Value GetHeight(const Napi::CallbackInfo& info);
void SetWidth(const Napi::CallbackInfo& info, const Napi::Value& value);
void SetHeight(const Napi::CallbackInfo& info, const Napi::Value& value);
void StreamPNGSync(const Napi::CallbackInfo& info);
void StreamPDFSync(const Napi::CallbackInfo& info);
void StreamJPEGSync(const Napi::CallbackInfo& info);
static void RegisterFont(const Napi::CallbackInfo& info);
static void DeregisterAllFonts(const Napi::CallbackInfo& info);
static Napi::Value ParseFont(const Napi::CallbackInfo& info);
Napi::Error CairoError(cairo_status_t status);
static void ToPngBufferAsync(Closure* closure);
static void ToJpegBufferAsync(Closure* closure);
static PangoWeight GetWeightFromCSSString(const char *weight);
static PangoStyle GetStyleFromCSSString(const char *style);
static PangoFontDescription *ResolveFontDescription(const PangoFontDescription *desc);
DLL_PUBLIC inline Backend* backend() { return _backend; }
DLL_PUBLIC inline cairo_surface_t* surface(){ return backend()->getSurface(); }
cairo_t* createCairoContext();
DLL_PUBLIC inline uint8_t *data(){ return cairo_image_surface_get_data(surface()); }
DLL_PUBLIC inline int stride(){ return cairo_image_surface_get_stride(surface()); }
DLL_PUBLIC inline std::size_t nBytes(){
return static_cast<std::size_t>(backend()->getHeight()) * stride();
}
DLL_PUBLIC inline int getWidth() { return backend()->getWidth(); }
DLL_PUBLIC inline int getHeight() { return backend()->getHeight(); }
void resurface(Napi::Object This);
Napi::Env env;
static int fontSerial;
private:
Backend* _backend;
Napi::ObjectReference _jsBackend;
Napi::FunctionReference ctor;
static std::vector<FontFace> font_face_list;
};

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#pragma once
#include <string>
#include <napi.h>
class CanvasError {
public:
std::string message;
std::string syscall;
std::string path;
int cerrno = 0;
void set(const char* iMessage = NULL, const char* iSyscall = NULL, int iErrno = 0, const char* iPath = NULL) {
if (iMessage) message.assign(iMessage);
if (iSyscall) syscall.assign(iSyscall);
cerrno = iErrno;
if (iPath) path.assign(iPath);
}
void reset() {
message.clear();
syscall.clear();
path.clear();
cerrno = 0;
}
bool empty() {
return cerrno == 0 && message.empty();
}
Napi::Error toError(Napi::Env env) {
if (cerrno) {
Napi::Error err = Napi::Error::New(env, strerror(cerrno));
if (!syscall.empty()) err.Value().Set("syscall", syscall);
if (!path.empty()) err.Value().Set("path", path);
return err;
} else {
return Napi::Error::New(env, message);
}
}
};

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// Copyright (c) 2010 LearnBoost <tj@learnboost.com>
#include "CanvasGradient.h"
#include "InstanceData.h"
#include "Canvas.h"
#include "color.h"
using namespace Napi;
/*
* Initialize CanvasGradient.
*/
void
Gradient::Initialize(Napi::Env& env, Napi::Object& exports) {
Napi::HandleScope scope(env);
InstanceData* data = env.GetInstanceData<InstanceData>();
Napi::Function ctor = DefineClass(env, "CanvasGradient", {
InstanceMethod<&Gradient::AddColorStop>("addColorStop", napi_default_method)
});
exports.Set("CanvasGradient", ctor);
data->CanvasGradientCtor = Napi::Persistent(ctor);
}
/*
* Initialize a new CanvasGradient.
*/
Gradient::Gradient(const Napi::CallbackInfo& info) : Napi::ObjectWrap<Gradient>(info), env(info.Env()) {
// Linear
if (
4 == info.Length() &&
info[0].IsNumber() &&
info[1].IsNumber() &&
info[2].IsNumber() &&
info[3].IsNumber()
) {
double x0 = info[0].As<Napi::Number>().DoubleValue();
double y0 = info[1].As<Napi::Number>().DoubleValue();
double x1 = info[2].As<Napi::Number>().DoubleValue();
double y1 = info[3].As<Napi::Number>().DoubleValue();
_pattern = cairo_pattern_create_linear(x0, y0, x1, y1);
return;
}
// Radial
if (
6 == info.Length() &&
info[0].IsNumber() &&
info[1].IsNumber() &&
info[2].IsNumber() &&
info[3].IsNumber() &&
info[4].IsNumber() &&
info[5].IsNumber()
) {
double x0 = info[0].As<Napi::Number>().DoubleValue();
double y0 = info[1].As<Napi::Number>().DoubleValue();
double r0 = info[2].As<Napi::Number>().DoubleValue();
double x1 = info[3].As<Napi::Number>().DoubleValue();
double y1 = info[4].As<Napi::Number>().DoubleValue();
double r1 = info[5].As<Napi::Number>().DoubleValue();
_pattern = cairo_pattern_create_radial(x0, y0, r0, x1, y1, r1);
return;
}
Napi::TypeError::New(env, "invalid arguments").ThrowAsJavaScriptException();
}
/*
* Add color stop.
*/
void
Gradient::AddColorStop(const Napi::CallbackInfo& info) {
if (!info[0].IsNumber()) {
Napi::TypeError::New(env, "offset required").ThrowAsJavaScriptException();
return;
}
if (!info[1].IsString()) {
Napi::TypeError::New(env, "color string required").ThrowAsJavaScriptException();
return;
}
short ok;
std::string str = info[1].As<Napi::String>();
uint32_t rgba = rgba_from_string(str.c_str(), &ok);
if (ok) {
rgba_t color = rgba_create(rgba);
cairo_pattern_add_color_stop_rgba(
_pattern
, info[0].As<Napi::Number>().DoubleValue()
, color.r
, color.g
, color.b
, color.a);
} else {
Napi::TypeError::New(env, "parse color failed").ThrowAsJavaScriptException();
}
}
/*
* Destroy the pattern.
*/
Gradient::~Gradient() {
if (_pattern) cairo_pattern_destroy(_pattern);
}

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// Copyright (c) 2010 LearnBoost <tj@learnboost.com>
#pragma once
#include <napi.h>
#include <cairo.h>
class Gradient : public Napi::ObjectWrap<Gradient> {
public:
static void Initialize(Napi::Env& env, Napi::Object& target);
Gradient(const Napi::CallbackInfo& info);
void AddColorStop(const Napi::CallbackInfo& info);
inline cairo_pattern_t *pattern(){ return _pattern; }
~Gradient();
Napi::Env env;
private:
cairo_pattern_t *_pattern;
};

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// Copyright (c) 2010 LearnBoost <tj@learnboost.com>
#include "CanvasPattern.h"
#include "Canvas.h"
#include "Image.h"
#include "InstanceData.h"
using namespace Napi;
const cairo_user_data_key_t *pattern_repeat_key;
/*
* Initialize CanvasPattern.
*/
void
Pattern::Initialize(Napi::Env& env, Napi::Object& exports) {
Napi::HandleScope scope(env);
InstanceData* data = env.GetInstanceData<InstanceData>();
// Constructor
Napi::Function ctor = DefineClass(env, "CanvasPattern", {
InstanceMethod<&Pattern::setTransform>("setTransform", napi_default_method)
});
// Prototype
exports.Set("CanvasPattern", ctor);
data->CanvasPatternCtor = Napi::Persistent(ctor);
}
/*
* Initialize a new CanvasPattern.
*/
Pattern::Pattern(const Napi::CallbackInfo& info) : ObjectWrap<Pattern>(info), env(info.Env()) {
if (!info[0].IsObject()) {
Napi::TypeError::New(env, "Image or Canvas expected").ThrowAsJavaScriptException();
return;
}
Napi::Object obj = info[0].As<Napi::Object>();
InstanceData* data = env.GetInstanceData<InstanceData>();
cairo_surface_t *surface;
// Image
if (obj.InstanceOf(data->ImageCtor.Value()).UnwrapOr(false)) {
Image *img = Image::Unwrap(obj);
if (!img->isComplete()) {
Napi::Error::New(env, "Image given has not completed loading").ThrowAsJavaScriptException();
return;
}
surface = img->surface();
// Canvas
} else if (obj.InstanceOf(data->CanvasCtor.Value()).UnwrapOr(false)) {
Canvas *canvas = Canvas::Unwrap(obj);
surface = canvas->surface();
// Invalid
} else {
if (!env.IsExceptionPending()) {
Napi::TypeError::New(env, "Image or Canvas expected").ThrowAsJavaScriptException();
}
return;
}
_pattern = cairo_pattern_create_for_surface(surface);
if (info[1].IsString()) {
if ("no-repeat" == info[1].As<Napi::String>().Utf8Value()) {
_repeat = NO_REPEAT;
} else if ("repeat-x" == info[1].As<Napi::String>().Utf8Value()) {
_repeat = REPEAT_X;
} else if ("repeat-y" == info[1].As<Napi::String>().Utf8Value()) {
_repeat = REPEAT_Y;
}
}
cairo_pattern_set_user_data(_pattern, pattern_repeat_key, &_repeat, NULL);
}
/*
* Set the pattern-space to user-space transform.
*/
void
Pattern::setTransform(const Napi::CallbackInfo& info) {
if (!info[0].IsObject()) {
Napi::TypeError::New(env, "Expected DOMMatrix").ThrowAsJavaScriptException();
return;
}
Napi::Object mat = info[0].As<Napi::Object>();
InstanceData* data = env.GetInstanceData<InstanceData>();
if (!mat.InstanceOf(data->DOMMatrixCtor.Value()).UnwrapOr(false)) {
if (!env.IsExceptionPending()) {
Napi::TypeError::New(env, "Expected DOMMatrix").ThrowAsJavaScriptException();
}
return;
}
Napi::Value one = Napi::Number::New(env, 1);
Napi::Value zero = Napi::Number::New(env, 0);
cairo_matrix_t matrix;
cairo_matrix_init(&matrix,
mat.Get("a").UnwrapOr(one).As<Napi::Number>().DoubleValue(),
mat.Get("b").UnwrapOr(zero).As<Napi::Number>().DoubleValue(),
mat.Get("c").UnwrapOr(zero).As<Napi::Number>().DoubleValue(),
mat.Get("d").UnwrapOr(one).As<Napi::Number>().DoubleValue(),
mat.Get("e").UnwrapOr(zero).As<Napi::Number>().DoubleValue(),
mat.Get("f").UnwrapOr(zero).As<Napi::Number>().DoubleValue()
);
cairo_matrix_invert(&matrix);
cairo_pattern_set_matrix(_pattern, &matrix);
}
repeat_type_t Pattern::get_repeat_type_for_cairo_pattern(cairo_pattern_t *pattern) {
void *ud = cairo_pattern_get_user_data(pattern, pattern_repeat_key);
return *reinterpret_cast<repeat_type_t*>(ud);
}
/*
* Destroy the pattern.
*/
Pattern::~Pattern() {
if (_pattern) cairo_pattern_destroy(_pattern);
}

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// Copyright (c) 2011 LearnBoost <tj@learnboost.com>
#pragma once
#include <cairo.h>
#include <napi.h>
/*
* Canvas types.
*/
typedef enum {
NO_REPEAT, // match CAIRO_EXTEND_NONE
REPEAT, // match CAIRO_EXTEND_REPEAT
REPEAT_X, // needs custom processing
REPEAT_Y // needs custom processing
} repeat_type_t;
extern const cairo_user_data_key_t *pattern_repeat_key;
class Pattern : public Napi::ObjectWrap<Pattern> {
public:
Pattern(const Napi::CallbackInfo& info);
static void Initialize(Napi::Env& env, Napi::Object& target);
void setTransform(const Napi::CallbackInfo& info);
static repeat_type_t get_repeat_type_for_cairo_pattern(cairo_pattern_t *pattern);
inline cairo_pattern_t *pattern(){ return _pattern; }
~Pattern();
Napi::Env env;
private:
cairo_pattern_t *_pattern;
repeat_type_t _repeat = REPEAT;
};

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// Copyright (c) 2010 LearnBoost <tj@learnboost.com>
#pragma once
#include "cairo.h"
#include "Canvas.h"
#include "color.h"
#include "napi.h"
#include <pango/pangocairo.h>
#include <stack>
/*
* State struct.
*
* Used in conjunction with Save() / Restore() since
* cairo's gstate maintains only a single source pattern at a time.
*/
struct canvas_state_t {
rgba_t fill = { 0, 0, 0, 1 };
rgba_t stroke = { 0, 0, 0, 1 };
rgba_t shadow = { 0, 0, 0, 0 };
double shadowOffsetX = 0.;
double shadowOffsetY = 0.;
cairo_pattern_t* fillPattern = nullptr;
cairo_pattern_t* strokePattern = nullptr;
cairo_pattern_t* fillGradient = nullptr;
cairo_pattern_t* strokeGradient = nullptr;
PangoFontDescription* fontDescription = nullptr;
std::string font = "10px sans-serif";
cairo_filter_t patternQuality = CAIRO_FILTER_GOOD;
float globalAlpha = 1.f;
int shadowBlur = 0;
text_align_t textAlignment = TEXT_ALIGNMENT_START;
text_baseline_t textBaseline = TEXT_BASELINE_ALPHABETIC;
canvas_draw_mode_t textDrawingMode = TEXT_DRAW_PATHS;
bool imageSmoothingEnabled = true;
std::string direction = "ltr";
canvas_state_t() {
fontDescription = pango_font_description_from_string("sans");
pango_font_description_set_absolute_size(fontDescription, 10 * PANGO_SCALE);
}
canvas_state_t(const canvas_state_t& other) {
fill = other.fill;
stroke = other.stroke;
patternQuality = other.patternQuality;
fillPattern = other.fillPattern;
strokePattern = other.strokePattern;
fillGradient = other.fillGradient;
strokeGradient = other.strokeGradient;
globalAlpha = other.globalAlpha;
textAlignment = other.textAlignment;
textBaseline = other.textBaseline;
shadow = other.shadow;
shadowBlur = other.shadowBlur;
shadowOffsetX = other.shadowOffsetX;
shadowOffsetY = other.shadowOffsetY;
textDrawingMode = other.textDrawingMode;
fontDescription = pango_font_description_copy(other.fontDescription);
font = other.font;
imageSmoothingEnabled = other.imageSmoothingEnabled;
}
~canvas_state_t() {
pango_font_description_free(fontDescription);
}
};
/*
* Equivalent to a PangoRectangle but holds floats instead of ints
* (software pixels are stored here instead of pango units)
*
* Should be compatible with PANGO_ASCENT, PANGO_LBEARING, etc.
*/
typedef struct {
float x;
float y;
float width;
float height;
} float_rectangle;
class Context2d : public Napi::ObjectWrap<Context2d> {
public:
std::stack<canvas_state_t> states;
canvas_state_t *state;
Context2d(const Napi::CallbackInfo& info);
static void Initialize(Napi::Env& env, Napi::Object& target);
void DrawImage(const Napi::CallbackInfo& info);
void PutImageData(const Napi::CallbackInfo& info);
void Save(const Napi::CallbackInfo& info);
void Restore(const Napi::CallbackInfo& info);
void Rotate(const Napi::CallbackInfo& info);
void Translate(const Napi::CallbackInfo& info);
void Scale(const Napi::CallbackInfo& info);
void Transform(const Napi::CallbackInfo& info);
Napi::Value GetTransform(const Napi::CallbackInfo& info);
void ResetTransform(const Napi::CallbackInfo& info);
void SetTransform(const Napi::CallbackInfo& info);
Napi::Value IsPointInPath(const Napi::CallbackInfo& info);
void BeginPath(const Napi::CallbackInfo& info);
void ClosePath(const Napi::CallbackInfo& info);
void AddPage(const Napi::CallbackInfo& info);
void Clip(const Napi::CallbackInfo& info);
void Fill(const Napi::CallbackInfo& info);
void Stroke(const Napi::CallbackInfo& info);
void FillText(const Napi::CallbackInfo& info);
void StrokeText(const Napi::CallbackInfo& info);
static Napi::Value SetFont(const Napi::CallbackInfo& info);
static Napi::Value SetFillColor(const Napi::CallbackInfo& info);
static Napi::Value SetStrokeColor(const Napi::CallbackInfo& info);
static Napi::Value SetStrokePattern(const Napi::CallbackInfo& info);
static Napi::Value SetTextAlignment(const Napi::CallbackInfo& info);
void SetLineDash(const Napi::CallbackInfo& info);
Napi::Value GetLineDash(const Napi::CallbackInfo& info);
Napi::Value MeasureText(const Napi::CallbackInfo& info);
void BezierCurveTo(const Napi::CallbackInfo& info);
void QuadraticCurveTo(const Napi::CallbackInfo& info);
void LineTo(const Napi::CallbackInfo& info);
void MoveTo(const Napi::CallbackInfo& info);
void FillRect(const Napi::CallbackInfo& info);
void StrokeRect(const Napi::CallbackInfo& info);
void ClearRect(const Napi::CallbackInfo& info);
void Rect(const Napi::CallbackInfo& info);
void RoundRect(const Napi::CallbackInfo& info);
void Arc(const Napi::CallbackInfo& info);
void ArcTo(const Napi::CallbackInfo& info);
void Ellipse(const Napi::CallbackInfo& info);
Napi::Value GetImageData(const Napi::CallbackInfo& info);
Napi::Value CreateImageData(const Napi::CallbackInfo& info);
static Napi::Value GetStrokeColor(const Napi::CallbackInfo& info);
Napi::Value CreatePattern(const Napi::CallbackInfo& info);
Napi::Value CreateLinearGradient(const Napi::CallbackInfo& info);
Napi::Value CreateRadialGradient(const Napi::CallbackInfo& info);
Napi::Value GetFormat(const Napi::CallbackInfo& info);
Napi::Value GetPatternQuality(const Napi::CallbackInfo& info);
Napi::Value GetImageSmoothingEnabled(const Napi::CallbackInfo& info);
Napi::Value GetGlobalCompositeOperation(const Napi::CallbackInfo& info);
Napi::Value GetGlobalAlpha(const Napi::CallbackInfo& info);
Napi::Value GetShadowColor(const Napi::CallbackInfo& info);
Napi::Value GetMiterLimit(const Napi::CallbackInfo& info);
Napi::Value GetLineCap(const Napi::CallbackInfo& info);
Napi::Value GetLineJoin(const Napi::CallbackInfo& info);
Napi::Value GetLineWidth(const Napi::CallbackInfo& info);
Napi::Value GetLineDashOffset(const Napi::CallbackInfo& info);
Napi::Value GetShadowOffsetX(const Napi::CallbackInfo& info);
Napi::Value GetShadowOffsetY(const Napi::CallbackInfo& info);
Napi::Value GetShadowBlur(const Napi::CallbackInfo& info);
Napi::Value GetAntiAlias(const Napi::CallbackInfo& info);
Napi::Value GetTextDrawingMode(const Napi::CallbackInfo& info);
Napi::Value GetQuality(const Napi::CallbackInfo& info);
Napi::Value GetCurrentTransform(const Napi::CallbackInfo& info);
Napi::Value GetFillStyle(const Napi::CallbackInfo& info);
Napi::Value GetStrokeStyle(const Napi::CallbackInfo& info);
Napi::Value GetFont(const Napi::CallbackInfo& info);
Napi::Value GetTextBaseline(const Napi::CallbackInfo& info);
Napi::Value GetTextAlign(const Napi::CallbackInfo& info);
void SetPatternQuality(const Napi::CallbackInfo& info, const Napi::Value& value);
void SetImageSmoothingEnabled(const Napi::CallbackInfo& info, const Napi::Value& value);
void SetGlobalCompositeOperation(const Napi::CallbackInfo& info, const Napi::Value& value);
void SetGlobalAlpha(const Napi::CallbackInfo& info, const Napi::Value& value);
void SetShadowColor(const Napi::CallbackInfo& info, const Napi::Value& value);
void SetMiterLimit(const Napi::CallbackInfo& info, const Napi::Value& value);
void SetLineCap(const Napi::CallbackInfo& info, const Napi::Value& value);
void SetLineJoin(const Napi::CallbackInfo& info, const Napi::Value& value);
void SetLineWidth(const Napi::CallbackInfo& info, const Napi::Value& value);
void SetLineDashOffset(const Napi::CallbackInfo& info, const Napi::Value& value);
void SetShadowOffsetX(const Napi::CallbackInfo& info, const Napi::Value& value);
void SetShadowOffsetY(const Napi::CallbackInfo& info, const Napi::Value& value);
void SetShadowBlur(const Napi::CallbackInfo& info, const Napi::Value& value);
void SetAntiAlias(const Napi::CallbackInfo& info, const Napi::Value& value);
void SetTextDrawingMode(const Napi::CallbackInfo& info, const Napi::Value& value);
void SetQuality(const Napi::CallbackInfo& info, const Napi::Value& value);
void SetCurrentTransform(const Napi::CallbackInfo& info, const Napi::Value& value);
void SetFillStyle(const Napi::CallbackInfo& info, const Napi::Value& value);
void SetStrokeStyle(const Napi::CallbackInfo& info, const Napi::Value& value);
void SetFont(const Napi::CallbackInfo& info, const Napi::Value& value);
void SetTextBaseline(const Napi::CallbackInfo& info, const Napi::Value& value);
void SetTextAlign(const Napi::CallbackInfo& info, const Napi::Value& value);
#if CAIRO_VERSION >= CAIRO_VERSION_ENCODE(1, 16, 0)
void BeginTag(const Napi::CallbackInfo& info);
void EndTag(const Napi::CallbackInfo& info);
#endif
Napi::Value GetDirection(const Napi::CallbackInfo& info);
void SetDirection(const Napi::CallbackInfo& info, const Napi::Value& value);
inline void setContext(cairo_t *ctx) { _context = ctx; }
inline cairo_t *context(){ return _context; }
inline Canvas *canvas(){ return _canvas; }
inline bool hasShadow();
void inline setSourceRGBA(rgba_t color);
void inline setSourceRGBA(cairo_t *ctx, rgba_t color);
void setTextPath(double x, double y);
void blur(cairo_surface_t *surface, int radius);
void shadow(void (fn)(cairo_t *cr));
void shadowStart();
void shadowApply();
void savePath();
void restorePath();
void saveState();
void restoreState();
void inline setFillRule(Napi::Value value);
void fill(bool preserve = false);
void stroke(bool preserve = false);
void save();
void restore();
void setFontFromState();
void resetState();
inline PangoLayout *layout(){ return _layout; }
~Context2d();
Napi::Env env;
private:
void _resetPersistentHandles();
Napi::Value _getFillColor();
Napi::Value _getStrokeColor();
Napi::Value get_current_transform();
void _setFillColor(Napi::Value arg);
void _setFillPattern(Napi::Value arg);
void _setStrokeColor(Napi::Value arg);
void _setStrokePattern(Napi::Value arg);
void checkFonts();
void paintText(const Napi::CallbackInfo&, bool);
Napi::Reference<Napi::Value> _fillStyle;
Napi::Reference<Napi::Value> _strokeStyle;
Canvas *_canvas;
cairo_t *_context = nullptr;
cairo_path_t *_path;
PangoLayout *_layout = nullptr;
int fontSerial = 1;
};

231
node_modules/canvas/src/CharData.h generated vendored Normal file
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// This is used for classifying characters according to the definition of tokens
// in the CSS standards, but could be extended for any other future uses
#pragma once
namespace CharData {
static constexpr uint8_t Whitespace = 0x1;
static constexpr uint8_t Newline = 0x2;
static constexpr uint8_t Hex = 0x4;
static constexpr uint8_t Nmstart = 0x8;
static constexpr uint8_t Nmchar = 0x10;
static constexpr uint8_t Sign = 0x20;
static constexpr uint8_t Digit = 0x40;
static constexpr uint8_t NumStart = 0x80;
};
using namespace CharData;
constexpr const uint8_t charData[256] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, // 0-8
Whitespace, // 9 (HT)
Whitespace | Newline, // 10 (LF)
0, // 11 (VT)
Whitespace | Newline, // 12 (FF)
Whitespace | Newline, // 13 (CR)
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 14-31
Whitespace, // 32 (Space)
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 33-42
Sign | NumStart, // 43 (+)
0, // 44
Nmchar | Sign | NumStart, // 45 (-)
0, 0, // 46-47
Nmchar | Digit | NumStart | Hex, // 48 (0)
Nmchar | Digit | NumStart | Hex, // 49 (1)
Nmchar | Digit | NumStart | Hex, // 50 (2)
Nmchar | Digit | NumStart | Hex, // 51 (3)
Nmchar | Digit | NumStart | Hex, // 52 (4)
Nmchar | Digit | NumStart | Hex, // 53 (5)
Nmchar | Digit | NumStart | Hex, // 54 (6)
Nmchar | Digit | NumStart | Hex, // 55 (7)
Nmchar | Digit | NumStart | Hex, // 56 (8)
Nmchar | Digit | NumStart | Hex, // 57 (9)
0, 0, 0, 0, 0, 0, 0, // 58-64
Nmstart | Nmchar | Hex, // 65 (A)
Nmstart | Nmchar | Hex, // 66 (B)
Nmstart | Nmchar | Hex, // 67 (C)
Nmstart | Nmchar | Hex, // 68 (D)
Nmstart | Nmchar | Hex, // 69 (E)
Nmstart | Nmchar | Hex, // 70 (F)
Nmstart | Nmchar, // 71 (G)
Nmstart | Nmchar, // 72 (H)
Nmstart | Nmchar, // 73 (I)
Nmstart | Nmchar, // 74 (J)
Nmstart | Nmchar, // 75 (K)
Nmstart | Nmchar, // 76 (L)
Nmstart | Nmchar, // 77 (M)
Nmstart | Nmchar, // 78 (N)
Nmstart | Nmchar, // 79 (O)
Nmstart | Nmchar, // 80 (P)
Nmstart | Nmchar, // 81 (Q)
Nmstart | Nmchar, // 82 (R)
Nmstart | Nmchar, // 83 (S)
Nmstart | Nmchar, // 84 (T)
Nmstart | Nmchar, // 85 (U)
Nmstart | Nmchar, // 86 (V)
Nmstart | Nmchar, // 87 (W)
Nmstart | Nmchar, // 88 (X)
Nmstart | Nmchar, // 89 (Y)
Nmstart | Nmchar, // 90 (Z)
0, // 91
Nmstart, // 92 (\)
0, 0, // 93-94
Nmstart | Nmchar, // 95 (_)
0, // 96
Nmstart | Nmchar | Hex, // 97 (a)
Nmstart | Nmchar | Hex, // 98 (b)
Nmstart | Nmchar | Hex, // 99 (c)
Nmstart | Nmchar | Hex, // 100 (d)
Nmstart | Nmchar | Hex, // 101 (e)
Nmstart | Nmchar | Hex, // 102 (f)
Nmstart | Nmchar, // 103 (g)
Nmstart | Nmchar, // 104 (h)
Nmstart | Nmchar, // 105 (i)
Nmstart | Nmchar, // 106 (j)
Nmstart | Nmchar, // 107 (k)
Nmstart | Nmchar, // 108 (l)
Nmstart | Nmchar, // 109 (m)
Nmstart | Nmchar, // 110 (n)
Nmstart | Nmchar, // 111 (o)
Nmstart | Nmchar, // 112 (p)
Nmstart | Nmchar, // 113 (q)
Nmstart | Nmchar, // 114 (r)
Nmstart | Nmchar, // 115 (s)
Nmstart | Nmchar, // 116 (t)
Nmstart | Nmchar, // 117 (u)
Nmstart | Nmchar, // 118 (v)
Nmstart | Nmchar, // 119 (w)
Nmstart | Nmchar, // 120 (x)
Nmstart | Nmchar, // 121 (y)
Nmstart | Nmchar, // 122 (z)
0, 0, 0, 0, 0, // 123-127
// Non-ASCII
Nmstart | Nmchar, // 128
Nmstart | Nmchar, // 129
Nmstart | Nmchar, // 130
Nmstart | Nmchar, // 131
Nmstart | Nmchar, // 132
Nmstart | Nmchar, // 133
Nmstart | Nmchar, // 134
Nmstart | Nmchar, // 135
Nmstart | Nmchar, // 136
Nmstart | Nmchar, // 137
Nmstart | Nmchar, // 138
Nmstart | Nmchar, // 139
Nmstart | Nmchar, // 140
Nmstart | Nmchar, // 141
Nmstart | Nmchar, // 142
Nmstart | Nmchar, // 143
Nmstart | Nmchar, // 144
Nmstart | Nmchar, // 145
Nmstart | Nmchar, // 146
Nmstart | Nmchar, // 147
Nmstart | Nmchar, // 148
Nmstart | Nmchar, // 149
Nmstart | Nmchar, // 150
Nmstart | Nmchar, // 151
Nmstart | Nmchar, // 152
Nmstart | Nmchar, // 153
Nmstart | Nmchar, // 154
Nmstart | Nmchar, // 155
Nmstart | Nmchar, // 156
Nmstart | Nmchar, // 157
Nmstart | Nmchar, // 158
Nmstart | Nmchar, // 159
Nmstart | Nmchar, // 160
Nmstart | Nmchar, // 161
Nmstart | Nmchar, // 162
Nmstart | Nmchar, // 163
Nmstart | Nmchar, // 164
Nmstart | Nmchar, // 165
Nmstart | Nmchar, // 166
Nmstart | Nmchar, // 167
Nmstart | Nmchar, // 168
Nmstart | Nmchar, // 169
Nmstart | Nmchar, // 170
Nmstart | Nmchar, // 171
Nmstart | Nmchar, // 172
Nmstart | Nmchar, // 173
Nmstart | Nmchar, // 174
Nmstart | Nmchar, // 175
Nmstart | Nmchar, // 176
Nmstart | Nmchar, // 177
Nmstart | Nmchar, // 178
Nmstart | Nmchar, // 179
Nmstart | Nmchar, // 180
Nmstart | Nmchar, // 181
Nmstart | Nmchar, // 182
Nmstart | Nmchar, // 183
Nmstart | Nmchar, // 184
Nmstart | Nmchar, // 185
Nmstart | Nmchar, // 186
Nmstart | Nmchar, // 187
Nmstart | Nmchar, // 188
Nmstart | Nmchar, // 189
Nmstart | Nmchar, // 190
Nmstart | Nmchar, // 191
Nmstart | Nmchar, // 192
Nmstart | Nmchar, // 193
Nmstart | Nmchar, // 194
Nmstart | Nmchar, // 195
Nmstart | Nmchar, // 196
Nmstart | Nmchar, // 197
Nmstart | Nmchar, // 198
Nmstart | Nmchar, // 199
Nmstart | Nmchar, // 200
Nmstart | Nmchar, // 201
Nmstart | Nmchar, // 202
Nmstart | Nmchar, // 203
Nmstart | Nmchar, // 204
Nmstart | Nmchar, // 205
Nmstart | Nmchar, // 206
Nmstart | Nmchar, // 207
Nmstart | Nmchar, // 208
Nmstart | Nmchar, // 209
Nmstart | Nmchar, // 210
Nmstart | Nmchar, // 211
Nmstart | Nmchar, // 212
Nmstart | Nmchar, // 213
Nmstart | Nmchar, // 214
Nmstart | Nmchar, // 215
Nmstart | Nmchar, // 216
Nmstart | Nmchar, // 217
Nmstart | Nmchar, // 218
Nmstart | Nmchar, // 219
Nmstart | Nmchar, // 220
Nmstart | Nmchar, // 221
Nmstart | Nmchar, // 222
Nmstart | Nmchar, // 223
Nmstart | Nmchar, // 224
Nmstart | Nmchar, // 225
Nmstart | Nmchar, // 226
Nmstart | Nmchar, // 227
Nmstart | Nmchar, // 228
Nmstart | Nmchar, // 229
Nmstart | Nmchar, // 230
Nmstart | Nmchar, // 231
Nmstart | Nmchar, // 232
Nmstart | Nmchar, // 233
Nmstart | Nmchar, // 234
Nmstart | Nmchar, // 235
Nmstart | Nmchar, // 236
Nmstart | Nmchar, // 237
Nmstart | Nmchar, // 238
Nmstart | Nmchar, // 239
Nmstart | Nmchar, // 240
Nmstart | Nmchar, // 241
Nmstart | Nmchar, // 242
Nmstart | Nmchar, // 243
Nmstart | Nmchar, // 244
Nmstart | Nmchar, // 245
Nmstart | Nmchar, // 246
Nmstart | Nmchar, // 247
Nmstart | Nmchar, // 248
Nmstart | Nmchar, // 249
Nmstart | Nmchar, // 250
Nmstart | Nmchar, // 251
Nmstart | Nmchar, // 252
Nmstart | Nmchar, // 253
Nmstart | Nmchar, // 254
Nmstart | Nmchar // 255
};

605
node_modules/canvas/src/FontParser.cc generated vendored Normal file
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@@ -0,0 +1,605 @@
// This is written to exactly parse the `font` shorthand in CSS2:
// https://www.w3.org/TR/CSS22/fonts.html#font-shorthand
// https://www.w3.org/TR/CSS22/syndata.html#tokenization
//
// We may want to update it for CSS 3 (e.g. font-stretch, or updated
// tokenization) but I've only ever seen one or two issues filed in node-canvas
// due to parsing in my 8 years on the project
#include "FontParser.h"
#include "CharData.h"
#include <cctype>
#include <unordered_map>
Token::Token(Type type, std::string value) : type_(type), value_(std::move(value)) {}
Token::Token(Type type, double value) : type_(type), value_(value) {}
Token::Token(Type type) : type_(type), value_(std::string{}) {}
const std::string&
Token::getString() const {
static const std::string empty;
auto* str = std::get_if<std::string>(&value_);
return str ? *str : empty;
}
double
Token::getNumber() const {
auto* num = std::get_if<double>(&value_);
return num ? *num : 0.0f;
}
Tokenizer::Tokenizer(std::string_view input) : input_(input) {}
std::string
Tokenizer::utf8Encode(uint32_t codepoint) {
std::string result;
if (codepoint < 0x80) {
result += static_cast<char>(codepoint);
} else if (codepoint < 0x800) {
result += static_cast<char>((codepoint >> 6) | 0xc0);
result += static_cast<char>((codepoint & 0x3f) | 0x80);
} else if (codepoint < 0x10000) {
result += static_cast<char>((codepoint >> 12) | 0xe0);
result += static_cast<char>(((codepoint >> 6) & 0x3f) | 0x80);
result += static_cast<char>((codepoint & 0x3f) | 0x80);
} else {
result += static_cast<char>((codepoint >> 18) | 0xf0);
result += static_cast<char>(((codepoint >> 12) & 0x3f) | 0x80);
result += static_cast<char>(((codepoint >> 6) & 0x3f) | 0x80);
result += static_cast<char>((codepoint & 0x3f) | 0x80);
}
return result;
}
char
Tokenizer::peek() const {
return position_ < input_.length() ? input_[position_] : '\0';
}
char
Tokenizer::advance() {
return position_ < input_.length() ? input_[position_++] : '\0';
}
Token
Tokenizer::parseNumber() {
enum class State {
Start,
AfterSign,
Digits,
AfterDecimal,
AfterE,
AfterESign,
ExponentDigits
};
size_t start = position_;
size_t ePosition = 0;
State state = State::Start;
bool valid = false;
while (position_ < input_.length()) {
char c = peek();
uint8_t flags = charData[static_cast<uint8_t>(c)];
switch (state) {
case State::Start:
if (flags & CharData::Sign) {
position_++;
state = State::AfterSign;
} else if (flags & CharData::Digit) {
position_++;
state = State::Digits;
valid = true;
} else if (c == '.') {
position_++;
state = State::AfterDecimal;
} else {
goto done;
}
break;
case State::AfterSign:
if (flags & CharData::Digit) {
position_++;
state = State::Digits;
valid = true;
} else if (c == '.') {
position_++;
state = State::AfterDecimal;
} else {
goto done;
}
break;
case State::Digits:
if (flags & CharData::Digit) {
position_++;
} else if (c == '.') {
position_++;
state = State::AfterDecimal;
} else if (c == 'e' || c == 'E') {
ePosition = position_;
position_++;
state = State::AfterE;
valid = false;
} else {
goto done;
}
break;
case State::AfterDecimal:
if (flags & CharData::Digit) {
position_++;
valid = true;
state = State::Digits;
} else {
goto done;
}
break;
case State::AfterE:
if (flags & CharData::Sign) {
position_++;
state = State::AfterESign;
} else if (flags & CharData::Digit) {
position_++;
valid = true;
state = State::ExponentDigits;
} else {
position_ = ePosition;
valid = true;
goto done;
}
break;
case State::AfterESign:
if (flags & CharData::Digit) {
position_++;
valid = true;
state = State::ExponentDigits;
} else {
position_ = ePosition;
valid = true;
goto done;
}
break;
case State::ExponentDigits:
if (flags & CharData::Digit) {
position_++;
} else {
goto done;
}
break;
}
}
done:
if (!valid) {
position_ = start;
return Token(Token::Type::Invalid);
}
std::string number_str(input_.substr(start, position_ - start));
double value = std::stod(number_str);
return Token(Token::Type::Number, value);
}
// Note that identifiers are always lower-case. This helps us make easier/more
// efficient comparisons, but means that font-families specified as identifiers
// will be lower-cased. Since font selection isn't case sensitive, this
// shouldn't ever be a problem.
Token
Tokenizer::parseIdentifier() {
std::string identifier;
auto flags = CharData::Nmstart;
auto start = position_;
while (position_ < input_.length()) {
char c = peek();
if (c == '\\') {
advance();
if (!parseEscape(identifier)) {
position_ = start;
return Token(Token::Type::Invalid);
}
flags = CharData::Nmchar;
} else if (charData[static_cast<uint8_t>(c)] & flags) {
identifier += advance() + (c >= 'A' && c <= 'Z' ? 32 : 0);
flags = CharData::Nmchar;
} else {
break;
}
}
return Token(Token::Type::Identifier, identifier);
}
uint32_t
Tokenizer::parseUnicode() {
uint32_t value = 0;
size_t count = 0;
while (position_ < input_.length() && count < 6) {
char c = peek();
uint32_t digit;
if (c >= '0' && c <= '9') {
digit = c - '0';
} else if (c >= 'a' && c <= 'f') {
digit = c - 'a' + 10;
} else if (c >= 'A' && c <= 'F') {
digit = c - 'A' + 10;
} else {
break;
}
value = value * 16 + digit;
advance();
count++;
}
// Optional whitespace after hex escape
char c = peek();
if (c == '\r') {
advance();
if (peek() == '\n') advance();
} else if (isWhitespace(c)) {
advance();
}
return value;
}
bool
Tokenizer::parseEscape(std::string& str) {
char c = peek();
auto flags = charData[static_cast<uint8_t>(c)];
if (flags & CharData::Hex) {
str += utf8Encode(parseUnicode());
return true;
} else if (!(flags & CharData::Newline) && !(flags & CharData::Hex)) {
str += advance();
return true;
}
return false;
}
Token
Tokenizer::parseString(char quote) {
advance();
std::string value;
auto start = position_;
while (position_ < input_.length()) {
char c = peek();
if (c == quote) {
advance();
return Token(Token::Type::QuotedString, value);
} else if (c == '\\') {
advance();
c = peek();
if (c == '\r') {
advance();
if (peek() == '\n') advance();
} else if (isNewline(c)) {
advance();
} else {
if (!parseEscape(value)) {
position_ = start;
return Token(Token::Type::Invalid);
}
}
} else {
value += advance();
}
}
position_ = start;
return Token(Token::Type::Invalid);
}
Token
Tokenizer::nextToken() {
if (position_ >= input_.length()) {
return Token(Token::Type::EndOfInput);
}
char c = peek();
auto flags = charData[static_cast<uint8_t>(c)];
if (isWhitespace(c)) {
std::string whitespace;
while (position_ < input_.length() && isWhitespace(peek())) {
whitespace += advance();
}
return Token(Token::Type::Whitespace, whitespace);
}
if (flags & CharData::NumStart) {
Token token = parseNumber();
if (token.type() != Token::Type::Invalid) return token;
}
if (flags & CharData::Nmstart) {
Token token = parseIdentifier();
if (token.type() != Token::Type::Invalid) return token;
}
if (c == '"') {
Token token = parseString('"');
if (token.type() != Token::Type::Invalid) return token;
}
if (c == '\'') {
Token token = parseString('\'');
if (token.type() != Token::Type::Invalid) return token;
}
switch (advance()) {
case '/': return Token(Token::Type::Slash);
case ',': return Token(Token::Type::Comma);
case '%': return Token(Token::Type::Percent);
default: return Token(Token::Type::Invalid);
}
}
FontParser::FontParser(std::string_view input)
: tokenizer_(input)
, currentToken_(tokenizer_.nextToken())
, nextToken_(tokenizer_.nextToken()) {}
const std::unordered_map<std::string, uint16_t> FontParser::weightMap = {
{"normal", 400},
{"bold", 700},
{"lighter", 100},
{"bolder", 700}
};
const std::unordered_map<std::string, double> FontParser::unitMap = {
{"cm", 37.8f},
{"mm", 3.78f},
{"in", 96.0f},
{"pt", 96.0f / 72.0f},
{"pc", 96.0f / 6.0f},
{"em", 16.0f},
{"px", 1.0f}
};
void
FontParser::advance() {
currentToken_ = nextToken_;
nextToken_ = tokenizer_.nextToken();
}
void
FontParser::skipWs() {
while (currentToken_.type() == Token::Type::Whitespace) advance();
}
bool
FontParser::check(Token::Type type) const {
return currentToken_.type() == type;
}
bool
FontParser::checkWs() const {
return nextToken_.type() == Token::Type::Whitespace
|| nextToken_.type() == Token::Type::EndOfInput;
}
bool
FontParser::parseFontStyle(FontProperties& props) {
if (check(Token::Type::Identifier)) {
const auto& value = currentToken_.getString();
if (value == "italic") {
props.fontStyle = FontStyle::Italic;
advance();
return true;
} else if (value == "oblique") {
props.fontStyle = FontStyle::Oblique;
advance();
return true;
} else if (value == "normal") {
props.fontStyle = FontStyle::Normal;
advance();
return true;
}
}
return false;
}
bool
FontParser::parseFontVariant(FontProperties& props) {
if (check(Token::Type::Identifier)) {
const auto& value = currentToken_.getString();
if (value == "small-caps") {
props.fontVariant = FontVariant::SmallCaps;
advance();
return true;
} else if (value == "normal") {
props.fontVariant = FontVariant::Normal;
advance();
return true;
}
}
return false;
}
bool
FontParser::parseFontWeight(FontProperties& props) {
if (check(Token::Type::Number)) {
double weightFloat = currentToken_.getNumber();
int weight = static_cast<int>(weightFloat);
if (weight < 1 || weight > 1000) return false;
props.fontWeight = static_cast<uint16_t>(weight);
advance();
return true;
} else if (check(Token::Type::Identifier)) {
const auto& value = currentToken_.getString();
if (auto it = weightMap.find(value); it != weightMap.end()) {
props.fontWeight = it->second;
advance();
return true;
}
}
return false;
}
bool
FontParser::parseFontSize(FontProperties& props) {
if (!check(Token::Type::Number)) return false;
props.fontSize = currentToken_.getNumber();
advance();
double multiplier = 1.0f;
if (check(Token::Type::Identifier)) {
const auto& unit = currentToken_.getString();
if (auto it = unitMap.find(unit); it != unitMap.end()) {
multiplier = it->second;
advance();
} else {
return false;
}
} else if (check(Token::Type::Percent)) {
multiplier = 16.0f / 100.0f;
advance();
} else {
return false;
}
// Technically if we consumed some tokens but couldn't parse the font-size,
// we should rewind the tokenizer, but I don't think the grammar allows for
// any valid alternates in this specific case
props.fontSize *= multiplier;
return true;
}
// line-height is not used by canvas ever, but should still parse
bool
FontParser::parseLineHeight(FontProperties& props) {
if (check(Token::Type::Slash)) {
advance();
skipWs();
if (check(Token::Type::Number)) {
advance();
if (check(Token::Type::Percent)) {
advance();
} else if (check(Token::Type::Identifier)) {
auto identifier = currentToken_.getString();
if (auto it = unitMap.find(identifier); it != unitMap.end()) {
advance();
} else {
return false;
}
} else {
return false;
}
} else if (check(Token::Type::Identifier) && currentToken_.getString() == "normal") {
advance();
} else {
return false;
}
}
return true;
}
bool
FontParser::parseFontFamily(FontProperties& props) {
while (!check(Token::Type::EndOfInput)) {
std::string family = "";
std::string trailingWs = "";
bool found = false;
while (
check(Token::Type::QuotedString) ||
check(Token::Type::Identifier) ||
check(Token::Type::Whitespace)
) {
if (check(Token::Type::Whitespace)) {
if (found) trailingWs += currentToken_.getString();
} else { // Identifier, QuotedString
if (found) {
family += trailingWs;
trailingWs.clear();
}
family += currentToken_.getString();
found = true;
}
advance();
}
if (!found) return false; // only whitespace or non-id/string found
props.fontFamily.push_back(family);
if (check(Token::Type::Comma)) advance();
}
return true;
}
FontProperties
FontParser::parse(const std::string& fontString, bool* success) {
FontParser parser(fontString);
auto result = parser.parseFont();
if (success) *success = !parser.hasError_;
return result;
}
FontProperties
FontParser::parseFont() {
FontProperties props;
uint8_t state = 0b111;
skipWs();
for (size_t i = 0; i < 3 && checkWs(); i++) {
if ((state & 0b001) && parseFontStyle(props)) {
state &= 0b110;
goto match;
}
if ((state & 0b010) && parseFontVariant(props)) {
state &= 0b101;
goto match;
}
if ((state & 0b100) && parseFontWeight(props)) {
state &= 0b011;
goto match;
}
break; // all attempts exhausted
match: skipWs(); // success: move to the next non-ws token
}
if (parseFontSize(props)) {
skipWs();
if (parseLineHeight(props) && parseFontFamily(props)) {
return props;
}
}
hasError_ = true;
return props;
}

115
node_modules/canvas/src/FontParser.h generated vendored Normal file
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#pragma once
#include <string>
#include <vector>
#include <optional>
#include <memory>
#include <variant>
#include <unordered_map>
#include "CharData.h"
enum class FontStyle {
Normal,
Italic,
Oblique
};
enum class FontVariant {
Normal,
SmallCaps
};
struct FontProperties {
double fontSize{16.0f};
std::vector<std::string> fontFamily;
uint16_t fontWeight{400};
FontVariant fontVariant{FontVariant::Normal};
FontStyle fontStyle{FontStyle::Normal};
};
class Token {
public:
enum class Type {
Invalid,
Number,
Percent,
Identifier,
Slash,
Comma,
QuotedString,
Whitespace,
EndOfInput
};
Token(Type type, std::string value);
Token(Type type, double value);
Token(Type type);
Type type() const { return type_; }
const std::string& getString() const;
double getNumber() const;
private:
Type type_;
std::variant<std::string, double> value_;
};
class Tokenizer {
public:
Tokenizer(std::string_view input);
Token nextToken();
private:
std::string_view input_;
size_t position_{0};
// Util
std::string utf8Encode(uint32_t codepoint);
inline bool isWhitespace(char c) const {
return charData[static_cast<uint8_t>(c)] & CharData::Whitespace;
}
inline bool isNewline(char c) const {
return charData[static_cast<uint8_t>(c)] & CharData::Newline;
}
// Moving through the string
char peek() const;
char advance();
// Tokenize
Token parseNumber();
Token parseIdentifier();
uint32_t parseUnicode();
bool parseEscape(std::string& str);
Token parseString(char quote);
};
class FontParser {
public:
static FontProperties parse(const std::string& fontString, bool* success = nullptr);
private:
static const std::unordered_map<std::string, uint16_t> weightMap;
static const std::unordered_map<std::string, double> unitMap;
FontParser(std::string_view input);
void advance();
void skipWs();
bool check(Token::Type type) const;
bool checkWs() const;
bool parseFontStyle(FontProperties& props);
bool parseFontVariant(FontProperties& props);
bool parseFontWeight(FontProperties& props);
bool parseFontSize(FontProperties& props);
bool parseLineHeight(FontProperties& props);
bool parseFontFamily(FontProperties& props);
FontProperties parseFont();
Tokenizer tokenizer_;
Token currentToken_;
Token nextToken_;
bool hasError_{false};
};

1727
node_modules/canvas/src/Image.cc generated vendored Normal file
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146
node_modules/canvas/src/Image.h generated vendored Normal file
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// Copyright (c) 2010 LearnBoost <tj@learnboost.com>
#pragma once
#include <cairo.h>
#include "CanvasError.h"
#include <functional>
#include <napi.h>
#include <stdint.h> // node < 7 uses libstdc++ on macOS which lacks complete c++11
#ifdef HAVE_JPEG
#include <jpeglib.h>
#include <jerror.h>
#endif
#ifdef HAVE_GIF
#include <gif_lib.h>
#if GIFLIB_MAJOR > 5 || GIFLIB_MAJOR == 5 && GIFLIB_MINOR >= 1
#define GIF_CLOSE_FILE(gif) DGifCloseFile(gif, NULL)
#else
#define GIF_CLOSE_FILE(gif) DGifCloseFile(gif)
#endif
#endif
#ifdef HAVE_RSVG
#include <librsvg/rsvg.h>
// librsvg <= 2.36.1, identified by undefined macro, needs an extra include
#ifndef LIBRSVG_CHECK_VERSION
#include <librsvg/rsvg-cairo.h>
#endif
#endif
using JPEGDecodeL = std::function<uint32_t (uint8_t* const src)>;
class Image : public Napi::ObjectWrap<Image> {
public:
char *filename;
int width, height;
int naturalWidth, naturalHeight;
Napi::Env env;
static Napi::FunctionReference constructor;
static void Initialize(Napi::Env& env, Napi::Object& target);
Image(const Napi::CallbackInfo& info);
Napi::Value GetComplete(const Napi::CallbackInfo& info);
Napi::Value GetWidth(const Napi::CallbackInfo& info);
Napi::Value GetHeight(const Napi::CallbackInfo& info);
Napi::Value GetNaturalWidth(const Napi::CallbackInfo& info);
Napi::Value GetNaturalHeight(const Napi::CallbackInfo& info);
Napi::Value GetDataMode(const Napi::CallbackInfo& info);
void SetDataMode(const Napi::CallbackInfo& info, const Napi::Value& value);
void SetWidth(const Napi::CallbackInfo& info, const Napi::Value& value);
void SetHeight(const Napi::CallbackInfo& info, const Napi::Value& value);
static Napi::Value GetSource(const Napi::CallbackInfo& info);
static void SetSource(const Napi::CallbackInfo& info);
inline uint8_t *data(){ return cairo_image_surface_get_data(_surface); }
inline int stride(){ return cairo_image_surface_get_stride(_surface); }
static int isPNG(uint8_t *data);
static int isJPEG(uint8_t *data);
static int isGIF(uint8_t *data);
static int isSVG(uint8_t *data, unsigned len);
static int isBMP(uint8_t *data, unsigned len);
static cairo_status_t readPNG(void *closure, unsigned char *data, unsigned len);
inline int isComplete(){ return COMPLETE == state; }
cairo_surface_t *surface();
cairo_status_t loadSurface();
cairo_status_t loadFromBuffer(uint8_t *buf, unsigned len);
cairo_status_t loadPNGFromBuffer(uint8_t *buf);
cairo_status_t loadPNG();
void clearData();
#ifdef HAVE_RSVG
cairo_status_t loadSVGFromBuffer(uint8_t *buf, unsigned len);
cairo_status_t loadSVG(FILE *stream);
cairo_status_t renderSVGToSurface();
#endif
#ifdef HAVE_GIF
cairo_status_t loadGIFFromBuffer(uint8_t *buf, unsigned len);
cairo_status_t loadGIF(FILE *stream);
#endif
#ifdef HAVE_JPEG
enum Orientation {
NORMAL,
MIRROR_HORIZ,
MIRROR_VERT,
ROTATE_180,
ROTATE_90_CW,
ROTATE_270_CW,
MIRROR_HORIZ_AND_ROTATE_90_CW,
MIRROR_HORIZ_AND_ROTATE_270_CW
};
cairo_status_t loadJPEGFromBuffer(uint8_t *buf, unsigned len);
cairo_status_t loadJPEG(FILE *stream);
void jpegToARGB(jpeg_decompress_struct* args, uint8_t* data, uint8_t* src, JPEGDecodeL decode);
cairo_status_t decodeJPEGIntoSurface(jpeg_decompress_struct *info, Orientation orientation);
cairo_status_t decodeJPEGBufferIntoMimeSurface(uint8_t *buf, unsigned len);
cairo_status_t assignDataAsMime(uint8_t *data, int len, const char *mime_type);
class Reader {
public:
virtual bool hasBytes(unsigned n) const = 0;
virtual uint8_t getNext() = 0;
virtual void skipBytes(unsigned n) = 0;
};
Orientation getExifOrientation(Reader& jpeg);
void updateDimensionsForOrientation(Orientation orientation);
void rotatePixels(uint8_t* pixels, int width, int height, int channels, Orientation orientation);
#endif
cairo_status_t loadBMPFromBuffer(uint8_t *buf, unsigned len);
cairo_status_t loadBMP(FILE *stream);
CanvasError errorInfo;
void loaded();
cairo_status_t load();
~Image();
enum {
DEFAULT
, LOADING
, COMPLETE
} state;
enum data_mode_t {
DATA_IMAGE = 1
, DATA_MIME = 2
} data_mode;
typedef enum {
UNKNOWN
, GIF
, JPEG
, PNG
, SVG
} type;
static type extension(const char *filename);
private:
cairo_surface_t *_surface;
uint8_t *_data = nullptr;
int _data_len;
#ifdef HAVE_RSVG
RsvgHandle *_rsvg;
bool _is_svg;
int _svg_last_width;
int _svg_last_height;
#endif
};

132
node_modules/canvas/src/ImageData.cc generated vendored Normal file
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// Copyright (c) 2010 LearnBoost <tj@learnboost.com>
#include "ImageData.h"
#include "InstanceData.h"
/*
* Initialize ImageData.
*/
void
ImageData::Initialize(Napi::Env& env, Napi::Object& exports) {
Napi::HandleScope scope(env);
InstanceData *data = env.GetInstanceData<InstanceData>();
Napi::Function ctor = DefineClass(env, "ImageData", {
InstanceAccessor<&ImageData::GetWidth>("width", napi_default_jsproperty),
InstanceAccessor<&ImageData::GetHeight>("height", napi_default_jsproperty)
});
exports.Set("ImageData", ctor);
data->ImageDataCtor = Napi::Persistent(ctor);
}
/*
* Initialize a new ImageData object.
*/
ImageData::ImageData(const Napi::CallbackInfo& info) : Napi::ObjectWrap<ImageData>(info), env(info.Env()) {
Napi::TypedArray dataArray;
uint32_t width;
uint32_t height;
int length;
if (info[0].IsNumber() && info[1].IsNumber()) {
width = info[0].As<Napi::Number>().Uint32Value();
if (width == 0) {
Napi::RangeError::New(env, "The source width is zero.").ThrowAsJavaScriptException();
return;
}
height = info[1].As<Napi::Number>().Uint32Value();
if (height == 0) {
Napi::RangeError::New(env, "The source height is zero.").ThrowAsJavaScriptException();
return;
}
length = width * height * 4; // ImageData(w, h) constructor assumes 4 BPP; documented.
dataArray = Napi::Uint8Array::New(env, length, napi_uint8_clamped_array);
} else if (
info[0].IsTypedArray() &&
info[0].As<Napi::TypedArray>().TypedArrayType() == napi_uint8_clamped_array &&
info[1].IsNumber()
) {
dataArray = info[0].As<Napi::Uint8Array>();
length = dataArray.ElementLength();
if (length == 0) {
Napi::RangeError::New(env, "The input data has a zero byte length.").ThrowAsJavaScriptException();
return;
}
// Don't assert that the ImageData length is a multiple of four because some
// data formats are not 4 BPP.
width = info[1].As<Napi::Number>().Uint32Value();
if (width == 0) {
Napi::RangeError::New(env, "The source width is zero.").ThrowAsJavaScriptException();
return;
}
// Don't assert that the byte length is a multiple of 4 * width, ditto.
if (info[2].IsNumber()) { // Explicit height given
height = info[2].As<Napi::Number>().Uint32Value();
} else { // Calculate height assuming 4 BPP
int size = length / 4;
height = size / width;
}
} else if (
info[0].IsTypedArray() &&
info[0].As<Napi::TypedArray>().TypedArrayType() == napi_uint16_array &&
info[1].IsNumber()
) { // Intended for RGB16_565 format
dataArray = info[0].As<Napi::TypedArray>();
length = dataArray.ElementLength();
if (length == 0) {
Napi::RangeError::New(env, "The input data has a zero byte length.").ThrowAsJavaScriptException();
return;
}
width = info[1].As<Napi::Number>().Uint32Value();
if (width == 0) {
Napi::RangeError::New(env, "The source width is zero.").ThrowAsJavaScriptException();
return;
}
if (info[2].IsNumber()) { // Explicit height given
height = info[2].As<Napi::Number>().Uint32Value();
} else { // Calculate height assuming 2 BPP
int size = length / 2;
height = size / width;
}
} else {
Napi::TypeError::New(env, "Expected (Uint8ClampedArray, width[, height]), (Uint16Array, width[, height]) or (width, height)").ThrowAsJavaScriptException();
return;
}
_width = width;
_height = height;
_data = dataArray.As<Napi::Uint8Array>().Data();
info.This().As<Napi::Object>().Set("data", dataArray);
}
/*
* Get width.
*/
Napi::Value
ImageData::GetWidth(const Napi::CallbackInfo& info) {
return Napi::Number::New(env, width());
}
/*
* Get height.
*/
Napi::Value
ImageData::GetHeight(const Napi::CallbackInfo& info) {
return Napi::Number::New(env, height());
}

26
node_modules/canvas/src/ImageData.h generated vendored Normal file
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// Copyright (c) 2010 LearnBoost <tj@learnboost.com>
#pragma once
#include <napi.h>
#include <stdint.h> // node < 7 uses libstdc++ on macOS which lacks complete c++11
class ImageData : public Napi::ObjectWrap<ImageData> {
public:
static void Initialize(Napi::Env& env, Napi::Object& exports);
ImageData(const Napi::CallbackInfo& info);
Napi::Value GetWidth(const Napi::CallbackInfo& info);
Napi::Value GetHeight(const Napi::CallbackInfo& info);
inline int width() { return _width; }
inline int height() { return _height; }
inline uint8_t *data() { return _data; }
Napi::Env env;
private:
int _width;
int _height;
uint8_t *_data;
};

15
node_modules/canvas/src/InstanceData.h generated vendored Normal file
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#include <napi.h>
struct InstanceData {
Napi::FunctionReference ImageBackendCtor;
Napi::FunctionReference PdfBackendCtor;
Napi::FunctionReference SvgBackendCtor;
Napi::FunctionReference CanvasCtor;
Napi::FunctionReference CanvasGradientCtor;
Napi::FunctionReference DOMMatrixCtor;
Napi::FunctionReference ImageCtor;
Napi::FunctionReference parseFont;
Napi::FunctionReference Context2dCtor;
Napi::FunctionReference ImageDataCtor;
Napi::FunctionReference CanvasPatternCtor;
};

157
node_modules/canvas/src/JPEGStream.h generated vendored Normal file
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#pragma once
#include "closure.h"
#include <jpeglib.h>
#include <jerror.h>
/*
* Expanded data destination object for closure output,
* inspired by IJG's jdatadst.c
*/
struct closure_destination_mgr {
jpeg_destination_mgr pub;
JpegClosure* closure;
JOCTET *buffer;
int bufsize;
};
void
init_closure_destination(j_compress_ptr cinfo){
// we really don't have to do anything here
}
boolean
empty_closure_output_buffer(j_compress_ptr cinfo){
closure_destination_mgr *dest = (closure_destination_mgr *) cinfo->dest;
Napi::Env env = dest->closure->canvas->Env();
Napi::HandleScope scope(env);
Napi::AsyncContext async(env, "canvas:empty_closure_output_buffer");
Napi::Object buf = Napi::Buffer<char>::New(env, (char *)dest->buffer, dest->bufsize);
// emit "data"
dest->closure->cb.MakeCallback(env.Global(), {env.Null(), buf}, async);
dest->buffer = (JOCTET *)malloc(dest->bufsize);
cinfo->dest->next_output_byte = dest->buffer;
cinfo->dest->free_in_buffer = dest->bufsize;
return true;
}
void
term_closure_destination(j_compress_ptr cinfo){
closure_destination_mgr *dest = (closure_destination_mgr *) cinfo->dest;
Napi::Env env = dest->closure->canvas->Env();
Napi::HandleScope scope(env);
Napi::AsyncContext async(env, "canvas:term_closure_destination");
/* emit remaining data */
Napi::Object buf = Napi::Buffer<char>::New(env, (char *)dest->buffer, dest->bufsize - dest->pub.free_in_buffer);
dest->closure->cb.MakeCallback(env.Global(), {env.Null(), buf}, async);
// emit "end"
dest->closure->cb.MakeCallback(env.Global(), {env.Null(), env.Null()}, async);
}
void
jpeg_closure_dest(j_compress_ptr cinfo, JpegClosure* closure, int bufsize){
closure_destination_mgr * dest;
/* The destination object is made permanent so that multiple JPEG images
* can be written to the same buffer without re-executing jpeg_mem_dest.
*/
if (cinfo->dest == NULL) { /* first time for this JPEG object? */
cinfo->dest = (struct jpeg_destination_mgr *)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
sizeof(closure_destination_mgr));
}
dest = (closure_destination_mgr *) cinfo->dest;
cinfo->dest->init_destination = &init_closure_destination;
cinfo->dest->empty_output_buffer = &empty_closure_output_buffer;
cinfo->dest->term_destination = &term_closure_destination;
dest->closure = closure;
dest->bufsize = bufsize;
dest->buffer = (JOCTET *)malloc(bufsize);
cinfo->dest->next_output_byte = dest->buffer;
cinfo->dest->free_in_buffer = dest->bufsize;
}
void encode_jpeg(jpeg_compress_struct cinfo, cairo_surface_t *surface, int quality, bool progressive, int chromaHSampFactor, int chromaVSampFactor) {
int w = cairo_image_surface_get_width(surface);
int h = cairo_image_surface_get_height(surface);
cinfo.in_color_space = JCS_RGB;
cinfo.input_components = 3;
cinfo.image_width = w;
cinfo.image_height = h;
jpeg_set_defaults(&cinfo);
if (progressive)
jpeg_simple_progression(&cinfo);
jpeg_set_quality(&cinfo, quality, (quality < 25) ? 0 : 1);
cinfo.comp_info[0].h_samp_factor = chromaHSampFactor;
cinfo.comp_info[0].v_samp_factor = chromaVSampFactor;
JSAMPROW slr;
jpeg_start_compress(&cinfo, TRUE);
unsigned char *dst;
unsigned int *src = (unsigned int *)cairo_image_surface_get_data(surface);
int sl = 0;
dst = (unsigned char *)malloc(w * 3);
while (sl < h) {
unsigned char *dp = dst;
int x = 0;
while (x < w) {
dp[0] = (*src >> 16) & 255;
dp[1] = (*src >> 8) & 255;
dp[2] = *src & 255;
src++;
dp += 3;
x++;
}
slr = dst;
jpeg_write_scanlines(&cinfo, &slr, 1);
sl++;
}
free(dst);
jpeg_finish_compress(&cinfo);
jpeg_destroy_compress(&cinfo);
}
void
write_to_jpeg_stream(cairo_surface_t *surface, int bufsize, JpegClosure* closure) {
jpeg_compress_struct cinfo;
jpeg_error_mgr jerr;
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_compress(&cinfo);
jpeg_closure_dest(&cinfo, closure, bufsize);
encode_jpeg(
cinfo,
surface,
closure->quality,
closure->progressive,
closure->chromaSubsampling,
closure->chromaSubsampling);
}
void
write_to_jpeg_buffer(cairo_surface_t* surface, JpegClosure* closure) {
jpeg_compress_struct cinfo;
jpeg_error_mgr jerr;
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_compress(&cinfo);
cinfo.client_data = closure;
cinfo.dest = closure->jpeg_dest_mgr;
encode_jpeg(
cinfo,
surface,
closure->quality,
closure->progressive,
closure->chromaSubsampling,
closure->chromaSubsampling);
}

292
node_modules/canvas/src/PNG.h generated vendored Normal file
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#pragma once
#include <cairo.h>
#include "closure.h"
#include <cmath> // round
#include <cstdlib>
#include <cstring>
#include <png.h>
#include <pngconf.h>
#if defined(__GNUC__) && (__GNUC__ > 2) && defined(__OPTIMIZE__)
#define likely(expr) (__builtin_expect (!!(expr), 1))
#define unlikely(expr) (__builtin_expect (!!(expr), 0))
#else
#define likely(expr) (expr)
#define unlikely(expr) (expr)
#endif
static void canvas_png_flush(png_structp png_ptr) {
/* Do nothing; fflush() is said to be just a waste of energy. */
(void) png_ptr; /* Stifle compiler warning */
}
/* Converts native endian xRGB => RGBx bytes */
static void canvas_convert_data_to_bytes(png_structp png, png_row_infop row_info, png_bytep data) {
unsigned int i;
for (i = 0; i < row_info->rowbytes; i += 4) {
uint8_t *b = &data[i];
uint32_t pixel;
memcpy(&pixel, b, sizeof (uint32_t));
b[0] = (pixel & 0xff0000) >> 16;
b[1] = (pixel & 0x00ff00) >> 8;
b[2] = (pixel & 0x0000ff) >> 0;
b[3] = 0;
}
}
/* Unpremultiplies data and converts native endian ARGB => RGBA bytes */
static void canvas_unpremultiply_data(png_structp png, png_row_infop row_info, png_bytep data) {
unsigned int i;
for (i = 0; i < row_info->rowbytes; i += 4) {
uint8_t *b = &data[i];
uint32_t pixel;
uint8_t alpha;
memcpy(&pixel, b, sizeof (uint32_t));
alpha = (pixel & 0xff000000) >> 24;
if (alpha == 0) {
b[0] = b[1] = b[2] = b[3] = 0;
} else {
b[0] = (((pixel & 0xff0000) >> 16) * 255 + alpha / 2) / alpha;
b[1] = (((pixel & 0x00ff00) >> 8) * 255 + alpha / 2) / alpha;
b[2] = (((pixel & 0x0000ff) >> 0) * 255 + alpha / 2) / alpha;
b[3] = alpha;
}
}
}
/* Converts RGB16_565 format data to RGBA32 */
static void canvas_convert_565_to_888(png_structp png, png_row_infop row_info, png_bytep data) {
// Loop in reverse to unpack in-place.
for (ptrdiff_t col = row_info->width - 1; col >= 0; col--) {
uint8_t* src = &data[col * sizeof(uint16_t)];
uint8_t* dst = &data[col * 3];
uint16_t pixel;
memcpy(&pixel, src, sizeof(uint16_t));
// Convert and rescale to the full 0-255 range
// See http://stackoverflow.com/a/29326693
const uint8_t red5 = (pixel & 0xF800) >> 11;
const uint8_t green6 = (pixel & 0x7E0) >> 5;
const uint8_t blue5 = (pixel & 0x001F);
dst[0] = ((red5 * 255 + 15) / 31);
dst[1] = ((green6 * 255 + 31) / 63);
dst[2] = ((blue5 * 255 + 15) / 31);
}
}
struct canvas_png_write_closure_t {
cairo_write_func_t write_func;
PngClosure* closure;
};
#ifdef PNG_SETJMP_SUPPORTED
bool setjmp_wrapper(png_structp png) {
return setjmp(png_jmpbuf(png));
}
#endif
static cairo_status_t canvas_write_png(cairo_surface_t *surface, png_rw_ptr write_func, canvas_png_write_closure_t *closure) {
unsigned int i;
cairo_status_t status = CAIRO_STATUS_SUCCESS;
uint8_t *data;
png_structp png;
png_infop info;
png_bytep *volatile rows = NULL;
png_color_16 white;
int png_color_type;
int bpc;
unsigned int width = cairo_image_surface_get_width(surface);
unsigned int height = cairo_image_surface_get_height(surface);
data = cairo_image_surface_get_data(surface);
if (data == NULL) {
status = CAIRO_STATUS_SURFACE_TYPE_MISMATCH;
return status;
}
cairo_surface_flush(surface);
if (width == 0 || height == 0) {
status = CAIRO_STATUS_WRITE_ERROR;
return status;
}
rows = (png_bytep *) malloc(height * sizeof (png_byte*));
if (unlikely(rows == NULL)) {
status = CAIRO_STATUS_NO_MEMORY;
return status;
}
int stride = cairo_image_surface_get_stride(surface);
for (i = 0; i < height; i++) {
rows[i] = (png_byte *) data + i * stride;
}
#ifdef PNG_USER_MEM_SUPPORTED
png = png_create_write_struct_2(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL, NULL, NULL, NULL);
#else
png = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
#endif
if (unlikely(png == NULL)) {
status = CAIRO_STATUS_NO_MEMORY;
free(rows);
return status;
}
info = png_create_info_struct (png);
if (unlikely(info == NULL)) {
status = CAIRO_STATUS_NO_MEMORY;
png_destroy_write_struct(&png, &info);
free(rows);
return status;
}
#ifdef PNG_SETJMP_SUPPORTED
if (setjmp_wrapper(png)) {
png_destroy_write_struct(&png, &info);
free(rows);
return status;
}
#endif
png_set_write_fn(png, closure, write_func, canvas_png_flush);
png_set_compression_level(png, closure->closure->compressionLevel);
png_set_filter(png, 0, closure->closure->filters);
if (closure->closure->resolution != 0) {
uint32_t res = static_cast<uint32_t>(round(static_cast<double>(closure->closure->resolution) * 39.3701));
png_set_pHYs(png, info, res, res, PNG_RESOLUTION_METER);
}
cairo_format_t format = cairo_image_surface_get_format(surface);
switch (format) {
case CAIRO_FORMAT_ARGB32:
bpc = 8;
png_color_type = PNG_COLOR_TYPE_RGB_ALPHA;
break;
#ifdef CAIRO_FORMAT_RGB30
case CAIRO_FORMAT_RGB30:
bpc = 10;
png_color_type = PNG_COLOR_TYPE_RGB;
break;
#endif
case CAIRO_FORMAT_RGB24:
bpc = 8;
png_color_type = PNG_COLOR_TYPE_RGB;
break;
case CAIRO_FORMAT_A8:
bpc = 8;
png_color_type = PNG_COLOR_TYPE_GRAY;
break;
case CAIRO_FORMAT_A1:
bpc = 1;
png_color_type = PNG_COLOR_TYPE_GRAY;
#ifndef WORDS_BIGENDIAN
png_set_packswap(png);
#endif
break;
case CAIRO_FORMAT_RGB16_565:
bpc = 8; // 565 gets upconverted to 888
png_color_type = PNG_COLOR_TYPE_RGB;
break;
case CAIRO_FORMAT_INVALID:
default:
status = CAIRO_STATUS_INVALID_FORMAT;
png_destroy_write_struct(&png, &info);
free(rows);
return status;
}
if ((format == CAIRO_FORMAT_A8 || format == CAIRO_FORMAT_A1) &&
closure->closure->palette != NULL) {
png_color_type = PNG_COLOR_TYPE_PALETTE;
}
png_set_IHDR(png, info, width, height, bpc, png_color_type, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
if (png_color_type == PNG_COLOR_TYPE_PALETTE) {
size_t nColors = closure->closure->nPaletteColors;
uint8_t* colors = closure->closure->palette;
uint8_t backgroundIndex = closure->closure->backgroundIndex;
png_colorp pngPalette = (png_colorp)png_malloc(png, nColors * sizeof(png_colorp));
png_bytep transparency = (png_bytep)png_malloc(png, nColors * sizeof(png_bytep));
for (i = 0; i < nColors; i++) {
pngPalette[i].red = colors[4 * i];
pngPalette[i].green = colors[4 * i + 1];
pngPalette[i].blue = colors[4 * i + 2];
transparency[i] = colors[4 * i + 3];
}
png_set_PLTE(png, info, pngPalette, nColors);
png_set_tRNS(png, info, transparency, nColors, NULL);
png_set_packing(png); // pack pixels
// have libpng free palette and trans:
png_data_freer(png, info, PNG_DESTROY_WILL_FREE_DATA, PNG_FREE_PLTE | PNG_FREE_TRNS);
png_color_16 bkg;
bkg.index = backgroundIndex;
png_set_bKGD(png, info, &bkg);
}
if (png_color_type != PNG_COLOR_TYPE_PALETTE) {
white.gray = (1 << bpc) - 1;
white.red = white.blue = white.green = white.gray;
png_set_bKGD(png, info, &white);
}
/* We have to call png_write_info() before setting up the write
* transformation, since it stores data internally in 'png'
* that is needed for the write transformation functions to work.
*/
png_write_info(png, info);
if (png_color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
png_set_write_user_transform_fn(png, canvas_unpremultiply_data);
} else if (format == CAIRO_FORMAT_RGB16_565) {
png_set_write_user_transform_fn(png, canvas_convert_565_to_888);
} else if (png_color_type == PNG_COLOR_TYPE_RGB) {
png_set_write_user_transform_fn(png, canvas_convert_data_to_bytes);
png_set_filler(png, 0, PNG_FILLER_AFTER);
}
png_write_image(png, rows);
png_write_end(png, info);
png_destroy_write_struct(&png, &info);
free(rows);
return status;
}
static void canvas_stream_write_func(png_structp png, png_bytep data, png_size_t size) {
cairo_status_t status;
struct canvas_png_write_closure_t *png_closure;
png_closure = (struct canvas_png_write_closure_t *) png_get_io_ptr(png);
status = png_closure->write_func(png_closure->closure, data, size);
if (unlikely(status)) {
cairo_status_t *error = (cairo_status_t *) png_get_error_ptr(png);
if (*error == CAIRO_STATUS_SUCCESS) {
*error = status;
}
png_error(png, NULL);
}
}
static cairo_status_t canvas_write_to_png_stream(cairo_surface_t *surface, cairo_write_func_t write_func, PngClosure* closure) {
struct canvas_png_write_closure_t png_closure;
if (cairo_surface_status(surface)) {
return cairo_surface_status(surface);
}
png_closure.write_func = write_func;
png_closure.closure = closure;
return canvas_write_png(surface, canvas_stream_write_func, &png_closure);
}

11
node_modules/canvas/src/Point.h generated vendored Normal file
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// Copyright (c) 2010 LearnBoost <tj@learnboost.com>
#pragma once
template <typename T>
class Point {
public:
T x, y;
Point(T x=0, T y=0): x(x), y(y) {}
Point(const Point&) = default;
Point& operator=(const Point&) = default;
};

9
node_modules/canvas/src/Util.h generated vendored Normal file
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#pragma once
#include <cctype>
inline bool streq_casein(std::string& str1, std::string& str2) {
return str1.size() == str2.size() && std::equal(str1.begin(), str1.end(), str2.begin(), [](char& c1, char& c2) {
return c1 == c2 || std::toupper(c1) == std::toupper(c2);
});
}

103
node_modules/canvas/src/backend/Backend.cc generated vendored Normal file
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#include "Backend.h"
#include <string>
#include <napi.h>
Backend::Backend(std::string name, Napi::CallbackInfo& info) : name(name), env(info.Env()) {
int width = 0;
int height = 0;
if (info[0].IsNumber()) width = info[0].As<Napi::Number>().Int32Value();
if (info[1].IsNumber()) height = info[1].As<Napi::Number>().Int32Value();
this->width = width;
this->height = height;
}
Backend::~Backend()
{
Backend::destroySurface();
}
void Backend::setCanvas(Canvas* _canvas)
{
this->canvas = _canvas;
}
cairo_surface_t* Backend::recreateSurface()
{
this->destroySurface();
return this->createSurface();
}
DLL_PUBLIC cairo_surface_t* Backend::getSurface() {
if (!surface) createSurface();
return surface;
}
void Backend::destroySurface()
{
if(this->surface)
{
cairo_surface_destroy(this->surface);
this->surface = NULL;
}
}
std::string Backend::getName()
{
return name;
}
int Backend::getWidth()
{
return this->width;
}
void Backend::setWidth(int width_)
{
this->width = width_;
this->recreateSurface();
}
int Backend::getHeight()
{
return this->height;
}
void Backend::setHeight(int height_)
{
this->height = height_;
this->recreateSurface();
}
bool Backend::isSurfaceValid(){
bool hadSurface = surface != NULL;
bool isValid = true;
cairo_status_t status = cairo_surface_status(getSurface());
if (status != CAIRO_STATUS_SUCCESS) {
error = cairo_status_to_string(status);
isValid = false;
}
if (!hadSurface)
destroySurface();
return isValid;
}
BackendOperationNotAvailable::BackendOperationNotAvailable(Backend* backend,
std::string operation_name)
: operation_name(operation_name)
{
msg = "operation " + operation_name +
" not supported by backend " + backend->getName();
};
BackendOperationNotAvailable::~BackendOperationNotAvailable() throw() {};
const char* BackendOperationNotAvailable::what() const throw()
{
return msg.c_str();
};

67
node_modules/canvas/src/backend/Backend.h generated vendored Normal file
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#pragma once
#include <cairo.h>
#include "../dll_visibility.h"
#include <exception>
#include <napi.h>
#include <string>
class Canvas;
class Backend
{
private:
const std::string name;
const char* error = NULL;
protected:
int width;
int height;
cairo_surface_t* surface = nullptr;
Canvas* canvas = nullptr;
Backend(std::string name, Napi::CallbackInfo& info);
public:
Napi::Env env;
virtual ~Backend();
void setCanvas(Canvas* canvas);
virtual cairo_surface_t* createSurface() = 0;
virtual cairo_surface_t* recreateSurface();
DLL_PUBLIC cairo_surface_t* getSurface();
virtual void destroySurface();
DLL_PUBLIC std::string getName();
DLL_PUBLIC int getWidth();
virtual void setWidth(int width);
DLL_PUBLIC int getHeight();
virtual void setHeight(int height);
// Overridden by ImageBackend. SVG and PDF thus always return INVALID.
virtual cairo_format_t getFormat() {
return CAIRO_FORMAT_INVALID;
}
bool isSurfaceValid();
inline const char* getError(){ return error; }
};
class BackendOperationNotAvailable: public std::exception
{
private:
std::string operation_name;
std::string msg;
public:
BackendOperationNotAvailable(Backend* backend, std::string operation_name);
~BackendOperationNotAvailable() throw();
const char* what() const throw();
};

63
node_modules/canvas/src/backend/ImageBackend.cc generated vendored Normal file
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#include "ImageBackend.h"
#include "../InstanceData.h"
#include <napi.h>
#include <cassert>
ImageBackend::ImageBackend(Napi::CallbackInfo& info) : Napi::ObjectWrap<ImageBackend>(info), Backend("image", info)
{
}
// This returns an approximate value only, suitable for
// Napi::MemoryManagement:: AdjustExternalMemory.
// The formats that don't map to intrinsic types (RGB30, A1) round up.
int32_t ImageBackend::approxBytesPerPixel() {
switch (format) {
case CAIRO_FORMAT_ARGB32:
case CAIRO_FORMAT_RGB24:
return 4;
#ifdef CAIRO_FORMAT_RGB30
case CAIRO_FORMAT_RGB30:
return 3;
#endif
case CAIRO_FORMAT_RGB16_565:
return 2;
case CAIRO_FORMAT_A8:
case CAIRO_FORMAT_A1:
return 1;
default:
return 0;
}
}
cairo_surface_t* ImageBackend::createSurface() {
assert(!surface);
surface = cairo_image_surface_create(format, width, height);
assert(surface);
Napi::MemoryManagement::AdjustExternalMemory(env, approxBytesPerPixel() * width * height);
return surface;
}
void ImageBackend::destroySurface() {
if (surface) {
cairo_surface_destroy(surface);
surface = nullptr;
Napi::MemoryManagement::AdjustExternalMemory(env, -approxBytesPerPixel() * width * height);
}
}
cairo_format_t ImageBackend::getFormat() {
return format;
}
void ImageBackend::setFormat(cairo_format_t _format) {
this->format = _format;
}
Napi::FunctionReference ImageBackend::constructor;
void ImageBackend::Initialize(Napi::Object target) {
Napi::Env env = target.Env();
Napi::Function ctor = DefineClass(env, "ImageBackend", {});
InstanceData* data = env.GetInstanceData<InstanceData>();
data->ImageBackendCtor = Napi::Persistent(ctor);
}

24
node_modules/canvas/src/backend/ImageBackend.h generated vendored Normal file
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#pragma once
#include "Backend.h"
#include <napi.h>
class ImageBackend : public Napi::ObjectWrap<ImageBackend>, public Backend
{
private:
cairo_surface_t* createSurface();
void destroySurface();
cairo_format_t format = DEFAULT_FORMAT;
public:
ImageBackend(Napi::CallbackInfo& info);
cairo_format_t getFormat();
void setFormat(cairo_format_t format);
int32_t approxBytesPerPixel();
static Napi::FunctionReference constructor;
static void Initialize(Napi::Object target);
const static cairo_format_t DEFAULT_FORMAT = CAIRO_FORMAT_ARGB32;
};

36
node_modules/canvas/src/backend/PdfBackend.cc generated vendored Normal file
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#include "PdfBackend.h"
#include <cairo-pdf.h>
#include "../InstanceData.h"
#include "../Canvas.h"
#include "../closure.h"
PdfBackend::PdfBackend(Napi::CallbackInfo& info) : Napi::ObjectWrap<PdfBackend>(info), Backend("pdf", info) {
PdfBackend::createSurface();
}
PdfBackend::~PdfBackend() {
cairo_surface_finish(surface);
if (_closure) delete _closure;
destroySurface();
}
cairo_surface_t* PdfBackend::createSurface() {
if (!_closure) _closure = new PdfSvgClosure(canvas);
surface = cairo_pdf_surface_create_for_stream(PdfSvgClosure::writeVec, _closure, width, height);
return surface;
}
cairo_surface_t* PdfBackend::recreateSurface() {
cairo_pdf_surface_set_size(surface, width, height);
return surface;
}
void
PdfBackend::Initialize(Napi::Object target) {
Napi::Env env = target.Env();
InstanceData* data = env.GetInstanceData<InstanceData>();
Napi::Function ctor = DefineClass(env, "PdfBackend", {});
data->PdfBackendCtor = Napi::Persistent(ctor);
}

23
node_modules/canvas/src/backend/PdfBackend.h generated vendored Normal file
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#pragma once
#include "Backend.h"
#include "../closure.h"
#include <napi.h>
class PdfBackend : public Napi::ObjectWrap<PdfBackend>, public Backend
{
private:
cairo_surface_t* createSurface();
cairo_surface_t* recreateSurface();
public:
PdfSvgClosure* _closure = NULL;
inline PdfSvgClosure* closure() { return _closure; }
PdfBackend(Napi::CallbackInfo& info);
~PdfBackend();
static Napi::FunctionReference constructor;
static void Initialize(Napi::Object target);
static Napi::Value New(const Napi::CallbackInfo& info);
};

48
node_modules/canvas/src/backend/SvgBackend.cc generated vendored Normal file
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#include "SvgBackend.h"
#include <cairo-svg.h>
#include <napi.h>
#include "../Canvas.h"
#include "../closure.h"
#include "../InstanceData.h"
#include <cassert>
using namespace Napi;
SvgBackend::SvgBackend(Napi::CallbackInfo& info) : Napi::ObjectWrap<SvgBackend>(info), Backend("svg", info) {
SvgBackend::createSurface();
}
SvgBackend::~SvgBackend() {
cairo_surface_finish(surface);
if (_closure) {
delete _closure;
_closure = nullptr;
}
destroySurface();
}
cairo_surface_t* SvgBackend::createSurface() {
assert(!_closure);
_closure = new PdfSvgClosure(canvas);
surface = cairo_svg_surface_create_for_stream(PdfSvgClosure::writeVec, _closure, width, height);
return surface;
}
cairo_surface_t* SvgBackend::recreateSurface() {
cairo_surface_finish(surface);
delete _closure;
_closure = nullptr;
cairo_surface_destroy(surface);
return createSurface();
}
void
SvgBackend::Initialize(Napi::Object target) {
Napi::Env env = target.Env();
Napi::Function ctor = DefineClass(env, "SvgBackend", {});
InstanceData* data = env.GetInstanceData<InstanceData>();
data->SvgBackendCtor = Napi::Persistent(ctor);
}

21
node_modules/canvas/src/backend/SvgBackend.h generated vendored Normal file
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#pragma once
#include "Backend.h"
#include "../closure.h"
#include <napi.h>
class SvgBackend : public Napi::ObjectWrap<SvgBackend>, public Backend
{
private:
cairo_surface_t* createSurface();
cairo_surface_t* recreateSurface();
public:
PdfSvgClosure* _closure = NULL;
inline PdfSvgClosure* closure() { return _closure; }
SvgBackend(Napi::CallbackInfo& info);
~SvgBackend();
static void Initialize(Napi::Object target);
};

457
node_modules/canvas/src/bmp/BMPParser.cc generated vendored Normal file
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#include "BMPParser.h"
#include <cassert>
using namespace std;
using namespace BMPParser;
#define MAX_IMG_SIZE 10000
#define E(cond, msg) if(cond) return setErr(msg)
#define EU(cond, msg) if(cond) return setErrUnsupported(msg)
#define EX(cond, msg) if(cond) return setErrUnknown(msg)
#define I1() get<char>()
#define U1() get<uint8_t>()
#define I2() get<int16_t>()
#define U2() get<uint16_t>()
#define I4() get<int32_t>()
#define U4() get<uint32_t>()
#define I1UC() get<char, false>()
#define U1UC() get<uint8_t, false>()
#define I2UC() get<int16_t, false>()
#define U2UC() get<uint16_t, false>()
#define I4UC() get<int32_t, false>()
#define U4UC() get<uint32_t, false>()
#define CHECK_OVERRUN(ptr, size, type) \
if((ptr) + (size) - data > len){ \
setErr("unexpected end of file"); \
return type(); \
}
Parser::~Parser(){
data = nullptr;
ptr = nullptr;
if(imgd){
delete[] imgd;
imgd = nullptr;
}
}
void Parser::parse(uint8_t *buf, int bufSize, uint8_t *format){
assert(status == Status::EMPTY);
data = ptr = buf;
len = bufSize;
// Start parsing file header
setOp("file header");
// File header signature
string fhSig = getStr(2);
string temp = "file header signature";
EU(fhSig == "BA", temp + " \"BA\"");
EU(fhSig == "CI", temp + " \"CI\"");
EU(fhSig == "CP", temp + " \"CP\"");
EU(fhSig == "IC", temp + " \"IC\"");
EU(fhSig == "PT", temp + " \"PT\"");
EX(fhSig != "BM", temp); // BM
// Length of the file should not be larger than `len`
E(U4() > static_cast<uint32_t>(len), "inconsistent file size");
// Skip unused values
skip(4);
// Offset where the pixel array (bitmap data) can be found
auto imgdOffset = U4();
// Start parsing DIB header
setOp("DIB header");
// Prepare some variables in case they are needed
uint32_t compr = 0;
uint32_t redShift = 0, greenShift = 0, blueShift = 0, alphaShift = 0;
uint32_t redMask = 0, greenMask = 0, blueMask = 0, alphaMask = 0;
double redMultp = 0, greenMultp = 0, blueMultp = 0, alphaMultp = 0;
/**
* Type of the DIB (device-independent bitmap) header
* is determined by its size. Most BMP files use BITMAPINFOHEADER.
*/
auto dibSize = U4();
temp = "DIB header";
EU(dibSize == 64, temp + " \"OS22XBITMAPHEADER\"");
EU(dibSize == 16, temp + " \"OS22XBITMAPHEADER\"");
uint32_t infoHeader = dibSize == 40 ? 1 :
dibSize == 52 ? 2 :
dibSize == 56 ? 3 :
dibSize == 108 ? 4 :
dibSize == 124 ? 5 : 0;
// BITMAPCOREHEADER, BITMAP*INFOHEADER, BITMAP*HEADER
auto isDibValid = dibSize == 12 || infoHeader;
EX(!isDibValid, temp);
// Image width
w = dibSize == 12 ? U2() : I4();
E(!w, "image width is 0");
E(w < 0, "negative image width");
E(w > MAX_IMG_SIZE, "too large image width");
// Image height (specification allows negative values)
h = dibSize == 12 ? U2() : I4();
E(!h, "image height is 0");
E(h > MAX_IMG_SIZE, "too large image height");
bool isHeightNegative = h < 0;
if(isHeightNegative) h = -h;
// Number of color planes (must be 1)
E(U2() != 1, "number of color planes must be 1");
// Bits per pixel (color depth)
auto bpp = U2();
auto isBppValid = bpp == 1 || bpp == 4 || bpp == 8 || bpp == 16 || bpp == 24 || bpp == 32;
EU(!isBppValid, "color depth");
// Calculate image data size and padding
uint32_t expectedImgdSize = (((w * bpp + 31) >> 5) << 2) * h;
uint32_t rowPadding = (-w * bpp & 31) >> 3;
uint32_t imgdSize = 0;
// Color palette data
uint8_t* paletteStart = nullptr;
uint32_t palColNum = 0;
if(infoHeader){
// Compression type
compr = U4();
temp = "compression type";
EU(compr == 1, temp + " \"BI_RLE8\"");
EU(compr == 2, temp + " \"BI_RLE4\"");
EU(compr == 4, temp + " \"BI_JPEG\"");
EU(compr == 5, temp + " \"BI_PNG\"");
EU(compr == 6, temp + " \"BI_ALPHABITFIELDS\"");
EU(compr == 11, temp + " \"BI_CMYK\"");
EU(compr == 12, temp + " \"BI_CMYKRLE8\"");
EU(compr == 13, temp + " \"BI_CMYKRLE4\"");
// BI_RGB and BI_BITFIELDS
auto isComprValid = compr == 0 || compr == 3;
EX(!isComprValid, temp);
// Ensure that BI_BITFIELDS appears only with 16-bit or 32-bit color
E(compr == 3 && !(bpp == 16 || bpp == 32), "compression BI_BITFIELDS can be used only with 16-bit and 32-bit color depth");
// Size of the image data
imgdSize = U4();
// Horizontal and vertical resolution (ignored)
skip(8);
// Number of colors in the palette or 0 if no palette is present
palColNum = U4();
EU(palColNum && bpp > 8, "color palette and bit depth combination");
if(palColNum) paletteStart = data + dibSize + 14;
// Number of important colors used or 0 if all colors are important (generally ignored)
skip(4);
if(infoHeader >= 2){
// If BI_BITFIELDS are used, calculate masks, otherwise ignore them
if(compr == 3){
calcMaskShift(redShift, redMask, redMultp);
calcMaskShift(greenShift, greenMask, greenMultp);
calcMaskShift(blueShift, blueMask, blueMultp);
if(infoHeader >= 3) calcMaskShift(alphaShift, alphaMask, alphaMultp);
if(status == Status::ERROR) return;
}else{
skip(16);
}
// Ensure that the color space is LCS_WINDOWS_COLOR_SPACE or sRGB
if(infoHeader >= 4 && !palColNum){
string colSpace = getStr(4, 1);
EU(colSpace != "Win " && colSpace != "sRGB", "color space \"" + colSpace + "\"");
}
}
}
// Skip to the image data (there may be other chunks between, but they are optional)
E(ptr - data > imgdOffset, "image data overlaps with another structure");
ptr = data + imgdOffset;
// Start parsing image data
setOp("image data");
if(!imgdSize){
// Value 0 is allowed only for BI_RGB compression type
E(compr != 0, "missing image data size");
imgdSize = expectedImgdSize;
}else{
E(imgdSize < expectedImgdSize, "invalid image data size");
}
// Ensure that all image data is present
E(ptr - data + imgdSize > len, "not enough image data");
// Direction of reading rows
int yStart = h - 1;
int yEnd = -1;
int dy = isHeightNegative ? 1 : -1;
// In case of negative height, read rows backward
if(isHeightNegative){
yStart = 0;
yEnd = h;
}
// Allocate output image data array
int buffLen = w * h << 2;
imgd = new (nothrow) uint8_t[buffLen];
E(!imgd, "unable to allocate memory");
// Prepare color values
uint8_t color[4] = {0};
uint8_t &red = color[0];
uint8_t &green = color[1];
uint8_t &blue = color[2];
uint8_t &alpha = color[3];
// Check if pre-multiplied alpha is used
bool premul = format ? format[4] : 0;
// Main loop
for(int y = yStart; y != yEnd; y += dy){
// Use in-byte offset for bpp < 8
uint8_t colOffset = 0;
uint8_t cval = 0;
uint32_t val = 0;
for(int x = 0; x != w; x++){
// Index in the output image data
int i = (x + y * w) << 2;
switch(compr){
case 0: // BI_RGB
switch(bpp){
case 1:
if(colOffset) ptr--;
cval = (U1UC() >> (7 - colOffset)) & 1;
if(palColNum){
uint8_t* entry = paletteStart + (cval << 2);
blue = get<uint8_t>(entry);
green = get<uint8_t>(entry + 1);
red = get<uint8_t>(entry + 2);
if(status == Status::ERROR) return;
}else{
red = green = blue = cval ? 255 : 0;
}
alpha = 255;
colOffset = (colOffset + 1) & 7;
break;
case 4:
if(colOffset) ptr--;
cval = (U1UC() >> (4 - colOffset)) & 15;
if(palColNum){
uint8_t* entry = paletteStart + (cval << 2);
blue = get<uint8_t>(entry);
green = get<uint8_t>(entry + 1);
red = get<uint8_t>(entry + 2);
if(status == Status::ERROR) return;
}else{
red = green = blue = cval << 4;
}
alpha = 255;
colOffset = (colOffset + 4) & 7;
break;
case 8:
cval = U1UC();
if(palColNum){
uint8_t* entry = paletteStart + (cval << 2);
blue = get<uint8_t>(entry);
green = get<uint8_t>(entry + 1);
red = get<uint8_t>(entry + 2);
if(status == Status::ERROR) return;
}else{
red = green = blue = cval;
}
alpha = 255;
break;
case 16:
// RGB555
val = U1UC();
val |= U1UC() << 8;
red = (val >> 10) << 3;
green = (val >> 5) << 3;
blue = val << 3;
alpha = 255;
break;
case 24:
blue = U1UC();
green = U1UC();
red = U1UC();
alpha = 255;
break;
case 32:
blue = U1UC();
green = U1UC();
red = U1UC();
if(infoHeader >= 3){
alpha = U1UC();
}else{
alpha = 255;
skip(1);
}
break;
}
break;
case 3: // BI_BITFIELDS
uint32_t col = bpp == 16 ? U2UC() : U4UC();
red = ((col >> redShift) & redMask) * redMultp + .5;
green = ((col >> greenShift) & greenMask) * greenMultp + .5;
blue = ((col >> blueShift) & blueMask) * blueMultp + .5;
alpha = alphaMask ? ((col >> alphaShift) & alphaMask) * alphaMultp + .5 : 255;
break;
}
/**
* Pixel format:
* red,
* green,
* blue,
* alpha,
* is alpha pre-multiplied
* Default is [0, 1, 2, 3, 0]
*/
if(premul && alpha != 255){
double a = alpha / 255.;
red = static_cast<uint8_t>(red * a + .5);
green = static_cast<uint8_t>(green * a + .5);
blue = static_cast<uint8_t>(blue * a + .5);
}
if(format){
imgd[i] = color[format[0]];
imgd[i + 1] = color[format[1]];
imgd[i + 2] = color[format[2]];
imgd[i + 3] = color[format[3]];
}else{
imgd[i] = red;
imgd[i + 1] = green;
imgd[i + 2] = blue;
imgd[i + 3] = alpha;
}
}
// Skip unused bytes in the current row
skip(rowPadding);
}
if(status == Status::ERROR) return;
status = Status::OK;
};
void Parser::clearImgd(){ imgd = nullptr; }
int32_t Parser::getWidth() const{ return w; }
int32_t Parser::getHeight() const{ return h; }
uint8_t *Parser::getImgd() const{ return imgd; }
Status Parser::getStatus() const{ return status; }
string Parser::getErrMsg() const{
return "Error while processing " + getOp() + " - " + err;
}
template <typename T, bool check> inline T Parser::get(){
if(check)
CHECK_OVERRUN(ptr, sizeof(T), T);
T val = *(T*)ptr;
ptr += sizeof(T);
return val;
}
template <typename T, bool check> inline T Parser::get(uint8_t* pointer){
if(check)
CHECK_OVERRUN(pointer, sizeof(T), T);
T val = *(T*)pointer;
return val;
}
string Parser::getStr(int size, bool reverse){
CHECK_OVERRUN(ptr, size, string);
string val = "";
while(size--){
if(reverse) val = string(1, static_cast<char>(*ptr++)) + val;
else val += static_cast<char>(*ptr++);
}
return val;
}
inline void Parser::skip(int size){
CHECK_OVERRUN(ptr, size, void);
ptr += size;
}
void Parser::calcMaskShift(uint32_t& shift, uint32_t& mask, double& multp){
mask = U4();
shift = 0;
if(mask == 0) return;
while(~mask & 1){
mask >>= 1;
shift++;
}
E(mask & (mask + 1), "invalid color mask");
multp = 255. / mask;
}
void Parser::setOp(string val){
if(status != Status::EMPTY) return;
op = val;
}
string Parser::getOp() const{
return op;
}
void Parser::setErrUnsupported(string msg){
setErr("unsupported " + msg);
}
void Parser::setErrUnknown(string msg){
setErr("unknown " + msg);
}
void Parser::setErr(string msg){
if(status != Status::EMPTY) return;
err = msg;
status = Status::ERROR;
}
string Parser::getErr() const{
return err;
}

60
node_modules/canvas/src/bmp/BMPParser.h generated vendored Normal file
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@@ -0,0 +1,60 @@
#pragma once
#ifdef ERROR
#define ERROR_ ERROR
#undef ERROR
#endif
#include <stdint.h> // node < 7 uses libstdc++ on macOS which lacks complete c++11
#include <string>
namespace BMPParser{
enum Status{
EMPTY,
OK,
ERROR,
};
class Parser{
public:
Parser()=default;
~Parser();
void parse(uint8_t *buf, int bufSize, uint8_t *format=nullptr);
void clearImgd();
int32_t getWidth() const;
int32_t getHeight() const;
uint8_t *getImgd() const;
Status getStatus() const;
std::string getErrMsg() const;
private:
Status status = Status::EMPTY;
uint8_t *data = nullptr;
uint8_t *ptr = nullptr;
int len = 0;
int32_t w = 0;
int32_t h = 0;
uint8_t *imgd = nullptr;
std::string err = "";
std::string op = "";
template <typename T, bool check=true> inline T get();
template <typename T, bool check=true> inline T get(uint8_t* pointer);
std::string getStr(int len, bool reverse=false);
inline void skip(int len);
void calcMaskShift(uint32_t& shift, uint32_t& mask, double& multp);
void setOp(std::string val);
std::string getOp() const;
void setErrUnsupported(std::string msg);
void setErrUnknown(std::string msg);
void setErr(std::string msg);
std::string getErr() const;
};
}
#ifdef ERROR_
#define ERROR ERROR_
#undef ERROR_
#endif

24
node_modules/canvas/src/bmp/LICENSE.md generated vendored Normal file
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@@ -0,0 +1,24 @@
This is free and unencumbered software released into the public domain.
Anyone is free to copy, modify, publish, use, compile, sell, or
distribute this software, either in source code form or as a compiled
binary, for any purpose, commercial or non-commercial, and by any
means.
In jurisdictions that recognize copyright laws, the author or authors
of this software dedicate any and all copyright interest in the
software to the public domain. We make this dedication for the benefit
of the public at large and to the detriment of our heirs and
successors. We intend this dedication to be an overt act of
relinquishment in perpetuity of all present and future rights to this
software under copyright law.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.
For more information, please refer to <http://unlicense.org>

52
node_modules/canvas/src/closure.cc generated vendored Normal file
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#include "closure.h"
#include "Canvas.h"
#ifdef HAVE_JPEG
void JpegClosure::init_destination(j_compress_ptr cinfo) {
JpegClosure* closure = (JpegClosure*)cinfo->client_data;
closure->vec.resize(PAGE_SIZE);
closure->jpeg_dest_mgr->next_output_byte = &closure->vec[0];
closure->jpeg_dest_mgr->free_in_buffer = closure->vec.size();
}
boolean JpegClosure::empty_output_buffer(j_compress_ptr cinfo) {
JpegClosure* closure = (JpegClosure*)cinfo->client_data;
size_t currentSize = closure->vec.size();
closure->vec.resize(currentSize * 1.5);
closure->jpeg_dest_mgr->next_output_byte = &closure->vec[currentSize];
closure->jpeg_dest_mgr->free_in_buffer = closure->vec.size() - currentSize;
return true;
}
void JpegClosure::term_destination(j_compress_ptr cinfo) {
JpegClosure* closure = (JpegClosure*)cinfo->client_data;
size_t finalSize = closure->vec.size() - closure->jpeg_dest_mgr->free_in_buffer;
closure->vec.resize(finalSize);
}
#endif
void
EncodingWorker::Init(void (*work_fn)(Closure*), Closure* closure) {
this->work_fn = work_fn;
this->closure = closure;
}
void
EncodingWorker::Execute() {
this->work_fn(this->closure);
}
void
EncodingWorker::OnWorkComplete(Napi::Env env, napi_status status) {
Napi::HandleScope scope(env);
if (closure->status) {
closure->cb.Call({ closure->canvas->CairoError(closure->status).Value() });
} else {
Napi::Object buf = Napi::Buffer<uint8_t>::Copy(env, &closure->vec[0], closure->vec.size());
closure->cb.Call({ env.Null(), buf });
}
closure->canvas->Unref();
delete closure;
}

93
node_modules/canvas/src/closure.h generated vendored Normal file
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@@ -0,0 +1,93 @@
// Copyright (c) 2010 LearnBoost <tj@learnboost.com>
#pragma once
#include "Canvas.h"
#ifdef HAVE_JPEG
#include <jpeglib.h>
#endif
#include <napi.h>
#include <png.h>
#include <stdint.h> // node < 7 uses libstdc++ on macOS which lacks complete c++11
#include <vector>
#ifndef PAGE_SIZE
#define PAGE_SIZE 4096
#endif
/*
* Image encoding closures.
*/
struct Closure {
std::vector<uint8_t> vec;
Napi::FunctionReference cb;
Canvas* canvas = nullptr;
cairo_status_t status = CAIRO_STATUS_SUCCESS;
static cairo_status_t writeVec(void *c, const uint8_t *odata, unsigned len) {
Closure* closure = static_cast<Closure*>(c);
try {
closure->vec.insert(closure->vec.end(), odata, odata + len);
} catch (const std::bad_alloc &) {
return CAIRO_STATUS_NO_MEMORY;
}
return CAIRO_STATUS_SUCCESS;
}
Closure(Canvas* canvas) : canvas(canvas) {};
};
struct PdfSvgClosure : Closure {
PdfSvgClosure(Canvas* canvas) : Closure(canvas) {};
};
struct PngClosure : Closure {
uint32_t compressionLevel = 6;
uint32_t filters = PNG_ALL_FILTERS;
uint32_t resolution = 0; // 0 = unspecified
// Indexed PNGs:
uint32_t nPaletteColors = 0;
uint8_t* palette = nullptr;
uint8_t backgroundIndex = 0;
PngClosure(Canvas* canvas) : Closure(canvas) {};
};
#ifdef HAVE_JPEG
struct JpegClosure : Closure {
uint32_t quality = 75;
uint32_t chromaSubsampling = 2;
bool progressive = false;
jpeg_destination_mgr* jpeg_dest_mgr = nullptr;
static void init_destination(j_compress_ptr cinfo);
static boolean empty_output_buffer(j_compress_ptr cinfo);
static void term_destination(j_compress_ptr cinfo);
JpegClosure(Canvas* canvas) : Closure(canvas) {
jpeg_dest_mgr = new jpeg_destination_mgr;
jpeg_dest_mgr->init_destination = init_destination;
jpeg_dest_mgr->empty_output_buffer = empty_output_buffer;
jpeg_dest_mgr->term_destination = term_destination;
};
~JpegClosure() {
delete jpeg_dest_mgr;
}
};
#endif
class EncodingWorker : public Napi::AsyncWorker {
public:
EncodingWorker(Napi::Env env): Napi::AsyncWorker(env) {};
void Init(void (*work_fn)(Closure*), Closure* closure);
void Execute() override;
void OnWorkComplete(Napi::Env env, napi_status status) override;
private:
void (*work_fn)(Closure*) = nullptr;
Closure* closure = nullptr;
};

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