/*
* Copyright (C) 2017 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/

// typedef (OffscreenCanvasRenderingContext2D or WebGLRenderingContext) OffscreenRenderingContext;

dictionary ImageEncodeOptions
{
   DOMString type = "image/png";
   unrestricted double quality = 1.0;
};

enum OffscreenRenderingContextType
{
   "2d",
   "webgl"
};

[
    ConstructorCallWith=ScriptExecutionContext,
    Constructor([EnforceRange] unsigned long width, [EnforceRange] unsigned long height),
    GenerateIsReachable=Impl,
    EnabledAtRuntime=ImageBitmapOffscreenCanvas,
    Exposed=(Window)
] interface OffscreenCanvas : EventTarget {
    attribute [EnforceRange] unsigned long width;
    attribute [EnforceRange] unsigned long height;

    [CallWith=ExecState, MayThrowException, Conditional=WEBGL] WebGLRenderingContext? getContext(OffscreenRenderingContextType contextType, any... arguments);
    ImageBitmap transferToImageBitmap();
    // Promise<Blob> convertToBlob(optional ImageEncodeOptions options);

};