libraries/png-js
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Allow extraction of pixel buffer via toPNGData()

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kts of kettek (Gliese) 2019-01-23 18:47:00 -08:00
parent d05c43904f
commit 7b43cf73ac
2 changed files with 21 additions and 4 deletions
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13
README.md
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@ -57,7 +57,10 @@ async decode()
: Decodes the palette and the pixel data of the PNG data passed into the constructor. Calls `decodePixels()` and `decodePalette()`. : Decodes the palette and the pixel data of the PNG data passed into the constructor. Calls `decodePixels()` and `decodePalette()`.
[ImageData](https://developer.mozilla.org/en-US/docs/Web/API/ImageData) async toImageData([ImageDataOptions](#imagedataoptions)) [ImageData](https://developer.mozilla.org/en-US/docs/Web/API/ImageData) async toImageData([ImageDataOptions](#imagedataoptions))
: Returns ImageData. Calls `decode()` automatically if PNG has not been decoded. : Returns ImageData. Calls `toPNGData(options)`.
[PNGData](#pngdata) async toPNGData([ImageDataOptions](#imagedataoptions))
: Returns PNGData. Calls `decode()` automatically if PNG has not been decoded.
### ImageDataOptions ### ImageDataOptions
Object containing options to apply during `toImageData()`. Object containing options to apply during `toImageData()`.
@ -97,3 +100,11 @@ let clip = {
h: 32, h: 32,
} }
``` ```
### PNGData
Object containing the pixel data and row width.
| Property | Type
|----------|------------
| pixels | [Uint8ClampedArray](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8ClampedArray) | RGBA pixel data.
| width | Number | Width of each row of pixel data.

12
src/index.js
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@ -294,7 +294,7 @@ class IndexedPNG {
return ret; return ret;
} }
async toImageData(options) { async toPNGData(options) {
const palette = options.palette || this.decodedPalette const palette = options.palette || this.decodedPalette
if (!this.decodedPixels) { if (!this.decodedPixels) {
await this.decode() await this.decode()
@ -322,7 +322,7 @@ class IndexedPNG {
pixels[i++] = palette[index+3] pixels[i++] = palette[index+3]
} }
} }
return new ImageData(pixels, options.clip.w) return { pixels: pixels, width: options.clip.w }
} else { } else {
// Allocate RGBA buffer // Allocate RGBA buffer
const pixels = new Uint8ClampedArray(this.decodedPixels.length * 4) const pixels = new Uint8ClampedArray(this.decodedPixels.length * 4)
@ -334,8 +334,14 @@ class IndexedPNG {
pixels[j++] = palette[index+2] // B pixels[j++] = palette[index+2] // B
pixels[j++] = palette[index+3] // A pixels[j++] = palette[index+3] // A
} }
return new ImageData(pixels, this.width) return { pixels: pixels, width: this.width }
} }
}
async toImageData(options) {
let data = await this.toPNGData(options)
return new ImageData(data.pixels, data.width)
} }
async decode() { async decode() {