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CanvasExtract.ts
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CanvasExtract.ts
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import { Rectangle, extensions, ExtensionType, RenderTexture, utils } from '@pixi/core';
import type { CanvasRenderer } from '@pixi/canvas-renderer';
import type { BaseRenderTexture, ExtensionMetadata, ICanvas, ISystem } from '@pixi/core';
import type { DisplayObject } from '@pixi/display';
const TEMP_RECT = new Rectangle();
/**
* The extract manager provides functionality to export content from the renderers.
*
* An instance of this class is automatically created by default, and can be found at `renderer.plugins.extract`
* @class
* @memberof PIXI
*/
export class CanvasExtract implements ISystem
{
/** @ignore */
static extension: ExtensionMetadata = {
name: 'extract',
type: ExtensionType.CanvasRendererSystem,
};
/** A reference to the current renderer */
public renderer: CanvasRenderer;
/**
* @param renderer - A reference to the current renderer
*/
constructor(renderer: CanvasRenderer)
{
this.renderer = renderer;
}
/**
* Will return a HTML Image of the target
* @param target - A displayObject or renderTexture
* to convert. If left empty will use the main renderer
* @param format - Image format, e.g. "image/jpeg" or "image/webp".
* @param quality - JPEG or Webp compression from 0 to 1. Default is 0.92.
* @returns HTML Image of the target
*/
public async image(target?: DisplayObject | RenderTexture, format?: string, quality?: number): Promise<HTMLImageElement>
{
const image = new Image();
image.src = await this.base64(target, format, quality);
return image;
}
/**
* Will return a base64 encoded string of this target. It works by calling
* `CanvasExtract.getCanvas` and then running toDataURL on that.
* @param target - A displayObject or renderTexture
* to convert. If left empty will use the main renderer
* @param format - Image format, e.g. "image/jpeg" or "image/webp".
* @param quality - JPEG or Webp compression from 0 to 1. Default is 0.92.
* @returns A base64 encoded string of the texture.
*/
public async base64(target?: DisplayObject | RenderTexture, format?: string, quality?: number): Promise<string>
{
const canvas = this.canvas(target);
if (canvas.toDataURL !== undefined)
{
return canvas.toDataURL(format, quality);
}
if (canvas.convertToBlob !== undefined)
{
const blob = await canvas.convertToBlob({ type: format, quality });
return await new Promise<string>((resolve) =>
{
const reader = new FileReader();
reader.onload = () => resolve(reader.result as string);
reader.readAsDataURL(blob);
});
}
throw new Error('CanvasExtract.base64() requires ICanvas.toDataURL or ICanvas.convertToBlob to be implemented');
}
/**
* Creates a Canvas element, renders this target to it and then returns it.
* @param target - A displayObject or renderTexture
* to convert. If left empty will use the main renderer
* @param frame - The frame the extraction is restricted to.
* @returns A Canvas element with the texture rendered on.
*/
public canvas(target?: DisplayObject | RenderTexture, frame?: Rectangle): ICanvas
{
const renderer = this.renderer;
let context;
let resolution;
let renderTexture;
if (target)
{
if (target instanceof RenderTexture)
{
renderTexture = target;
}
else
{
renderTexture = renderer.generateTexture(target);
}
}
if (renderTexture)
{
context = (renderTexture.baseTexture as BaseRenderTexture)._canvasRenderTarget.context;
resolution = (renderTexture.baseTexture as BaseRenderTexture)._canvasRenderTarget.resolution;
frame = frame ?? renderTexture.frame;
}
else
{
context = renderer.canvasContext.rootContext;
resolution = renderer._view.resolution;
if (!frame)
{
frame = TEMP_RECT;
frame.width = renderer.width;
frame.height = renderer.height;
}
}
const x = Math.round(frame.x * resolution);
const y = Math.round(frame.y * resolution);
const width = Math.round(frame.width * resolution);
const height = Math.round(frame.height * resolution);
const canvasBuffer = new utils.CanvasRenderTarget(width, height, 1);
const canvasData = context.getImageData(x, y, width, height);
canvasBuffer.context.putImageData(canvasData, 0, 0);
// send the canvas back..
return canvasBuffer.canvas;
}
/**
* Will return a one-dimensional array containing the pixel data of the entire texture in RGBA
* order, with integer values between 0 and 255 (included).
* @param target - A displayObject or renderTexture
* to convert. If left empty will use the main renderer
* @param frame - The frame the extraction is restricted to.
* @returns One-dimensional array containing the pixel data of the entire texture
*/
public pixels(target?: DisplayObject | RenderTexture, frame?: Rectangle): Uint8ClampedArray
{
const renderer = this.renderer;
let context;
let resolution;
let renderTexture;
if (target)
{
if (target instanceof RenderTexture)
{
renderTexture = target;
}
else
{
renderTexture = renderer.generateTexture(target);
}
}
if (renderTexture)
{
context = (renderTexture.baseTexture as BaseRenderTexture)._canvasRenderTarget.context;
resolution = (renderTexture.baseTexture as BaseRenderTexture)._canvasRenderTarget.resolution;
frame = frame ?? renderTexture.frame;
}
else
{
context = renderer.canvasContext.rootContext;
resolution = renderer.resolution;
if (!frame)
{
frame = TEMP_RECT;
frame.width = renderer.width;
frame.height = renderer.height;
}
}
const x = Math.round(frame.x * resolution);
const y = Math.round(frame.y * resolution);
const width = Math.round(frame.width * resolution);
const height = Math.round(frame.height * resolution);
return context.getImageData(x, y, width, height).data;
}
/** Destroys the extract */
public destroy(): void
{
this.renderer = null;
}
}
extensions.add(CanvasExtract);