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canvas does not support being loaded in worker threads due to it being a native dependency that was not written using a thread-compatible API. sharp, on the other hand, is thread-aware: lovell/sharp#1558.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,33 @@ | ||
| const RGBA_CHANNEL_COUNT = 4 | ||
|
|
||
| export function createImageData( | ||
| data: Uint8ClampedArray, | ||
| width: number, | ||
| height: number | ||
| ): ImageData | ||
| export function createImageData(width: number, height: number): ImageData | ||
| export function createImageData(...args: unknown[]): ImageData { | ||
| let data: Uint8ClampedArray | ||
| let width: number | ||
| let height: number | ||
|
|
||
| if ( | ||
| args.length === 2 && | ||
| typeof args[0] === 'number' && | ||
| typeof args[1] === 'number' | ||
| ) { | ||
| ;[width, height] = args | ||
| data = new Uint8ClampedArray(width * height * RGBA_CHANNEL_COUNT) | ||
| } else if ( | ||
| args.length === 3 && | ||
| args[0] instanceof Uint8ClampedArray && | ||
| typeof args[1] === 'number' && | ||
| typeof args[2] === 'number' | ||
| ) { | ||
| ;[data, width, height] = args | ||
| } else { | ||
| throw new TypeError('unexpected arguments given to createImageData') | ||
| } | ||
|
|
||
| return { data, width, height } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,18 +1,17 @@ | ||
| import { createCanvas, loadImage } from 'canvas' | ||
| import { promises as fs } from 'fs' | ||
| import sharp from 'sharp' | ||
|
|
||
| export async function readImageData(fileData: Buffer): Promise<ImageData> | ||
| export async function readImageData(filePath: string): Promise<ImageData> | ||
| export async function readImageData( | ||
| filePathOrData: string | Buffer | ||
| ): Promise<ImageData> { | ||
| const fileData = | ||
| typeof filePathOrData === 'string' | ||
| ? await fs.readFile(filePathOrData) | ||
| : filePathOrData | ||
| const image = await loadImage(fileData) | ||
| const canvas = createCanvas(image.width, image.height) | ||
| const context = canvas.getContext('2d') | ||
| context.drawImage(image, 0, 0) | ||
| return context.getImageData(0, 0, image.width, image.height) | ||
| const img = await sharp(filePathOrData) | ||
| .raw() | ||
| .ensureAlpha() | ||
| .toBuffer({ resolveWithObject: true }) | ||
| return { | ||
| data: Uint8ClampedArray.from(img.data), | ||
| width: img.info.width, | ||
| height: img.info.height, | ||
| } | ||
| } |
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