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/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at
* For more information on this interface, please see
typedef (OffscreenCanvasRenderingContext2D or ImageBitmapRenderingContext or WebGLRenderingContext or WebGL2RenderingContext or GPUCanvasContext) OffscreenRenderingContext;
dictionary ImageEncodeOptions {
DOMString type = "image/png";
unrestricted double quality;
enum OffscreenRenderingContextId { "2d", "bitmaprenderer", "webgl", "webgl2", "webgpu" };
[Exposed=(Window,Worker), Pref="gfx.offscreencanvas.enabled"]
interface OffscreenCanvas : EventTarget {
constructor([EnforceRange] unsigned long width, [EnforceRange] unsigned long height);
[Pure, SetterThrows]
attribute [EnforceRange] unsigned long width;
[Pure, SetterThrows]
attribute [EnforceRange] unsigned long height;
OffscreenRenderingContext? getContext(OffscreenRenderingContextId contextId,
optional any contextOptions = null);
ImageBitmap transferToImageBitmap();
Promise<Blob> convertToBlob(optional ImageEncodeOptions options = {});
attribute EventHandler oncontextlost;
attribute EventHandler oncontextrestored;
// Deprecated by convertToBlob
[Deprecated="OffscreenCanvasToBlob", NewObject]
Promise<Blob> toBlob(optional DOMString type = "",
optional any encoderOptions);