third_party/WebKit/Source/core/offscreencanvas/OffscreenCanvas.idl

// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

[
    Constructor([EnforceRange] unsigned long width, [EnforceRange] unsigned long height),
    Exposed=(Window,Worker),
    RuntimeEnabled=ExperimentalCanvasFeatures,
    MeasureAs=OffscreenCanvas,
] interface OffscreenCanvas : EventTarget {
    [RaisesException=Setter, EnforceRange] attribute unsigned long width;
    [RaisesException=Setter, EnforceRange] attribute unsigned long height;

    [CallWith=ScriptState, RaisesException] ImageBitmap transferToImageBitmap();
    [RaisesException, CallWith=ScriptState] Promise<Blob> convertToBlob(optional ImageEncodeOptions options);
};