tenfourfox/dom/canvas/CanvasRenderingContextHelper.h

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2017-04-19 07:56:45 +00:00
/* -*- Mode: C++; 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 http://mozilla.org/MPL/2.0/. */
#ifndef MOZILLA_DOM_CANVASRENDERINGCONTEXTHELPER_H_
#define MOZILLA_DOM_CANVASRENDERINGCONTEXTHELPER_H_
#include "mozilla/dom/BindingDeclarations.h"
#include "nsSize.h"
class nsICanvasRenderingContextInternal;
class nsIGlobalObject;
namespace mozilla {
class ErrorResult;
namespace dom {
class FileCallback;
enum class CanvasContextType : uint8_t {
NoContext,
Canvas2D,
WebGL1,
WebGL2
};
/**
* Povides common RenderingContext functionality used by both OffscreenCanvas
* and HTMLCanvasElement.
*/
class CanvasRenderingContextHelper
{
public:
virtual already_AddRefed<nsISupports>
GetContext(JSContext* aCx,
const nsAString& aContextId,
JS::Handle<JS::Value> aContextOptions,
ErrorResult& aRv);
virtual bool GetOpaqueAttr() = 0;
protected:
virtual nsresult UpdateContext(JSContext* aCx,
JS::Handle<JS::Value> aNewContextOptions,
ErrorResult& aRvForDictionaryInit);
virtual nsresult ParseParams(JSContext* aCx,
const nsAString& aType,
const JS::Value& aEncoderOptions,
nsAString& outParams,
bool* const outCustomParseOptions);
void ToBlob(JSContext* aCx, nsIGlobalObject* global, FileCallback& aCallback,
const nsAString& aType, JS::Handle<JS::Value> aParams,
ErrorResult& aRv);
virtual already_AddRefed<nsICanvasRenderingContextInternal>
CreateContext(CanvasContextType aContextType);
virtual nsIntSize GetWidthHeight() = 0;
CanvasContextType mCurrentContextType;
nsCOMPtr<nsICanvasRenderingContextInternal> mCurrentContext;
};
} // namespace dom
} // namespace mozilla
#endif // MOZILLA_DOM_CANVASRENDERINGCONTEXTHELPER_H_