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/* -*- 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/UniquePtr.h"
#include "mozilla/dom/BindingDeclarations.h"
#include "mozilla/gfx/Point.h"
#include "mozilla/layers/LayersTypes.h"
#include "nsSize.h"
class nsICanvasRenderingContextInternal;
class nsIGlobalObject;
namespace mozilla {
class ErrorResult;
namespace layers {
class SurfaceDescriptor;
} // namespace layers
namespace CanvasUtils {
enum class ImageExtraction;
}
namespace dom {
class BlobCallback;
class EncodeCompleteCallback;
enum class CanvasContextType : uint8_t {
NoContext,
Canvas2D,
OffscreenCanvas2D,
WebGL1,
WebGL2,
WebGPU,
ImageBitmap
};
/**
* Povides common RenderingContext functionality used by both OffscreenCanvas
* and HTMLCanvasElement.
*/
class CanvasRenderingContextHelper {
public:
CanvasRenderingContextHelper();
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, EncodeCompleteCallback* aCallback,
const nsAString& aType, JS::Handle<JS::Value> aParams,
CanvasUtils::ImageExtraction aExtractionBehavior,
ErrorResult& aRv);
void ToBlob(EncodeCompleteCallback* aCallback, nsAString& aType,
const nsAString& aEncodeOptions, bool aUsingCustomOptions,
CanvasUtils::ImageExtraction aExtractionBehavior,
ErrorResult& aRv);
virtual UniquePtr<uint8_t[]> GetImageBuffer(
CanvasUtils::ImageExtraction aExtractionBehavior, int32_t* aOutFormat,
gfx::IntSize* aOutImageSize);
already_AddRefed<nsISupports> GetOrCreateContext(
JSContext* aCx, const nsAString& aContextId,
JS::Handle<JS::Value> aContextOptions, ErrorResult& aRv);
already_AddRefed<nsISupports> GetOrCreateContext(
JSContext* aCx, CanvasContextType aContextType,
JS::Handle<JS::Value> aContextOptions, ErrorResult& aRv);
virtual already_AddRefed<nsICanvasRenderingContextInternal> CreateContext(
CanvasContextType aContextType);
already_AddRefed<nsICanvasRenderingContextInternal> CreateContextHelper(
CanvasContextType aContextType, layers::LayersBackend aCompositorBackend);
virtual CSSIntSize GetWidthHeight() = 0;
CanvasContextType mCurrentContextType;
nsCOMPtr<nsICanvasRenderingContextInternal> mCurrentContext;
};
Maybe<layers::SurfaceDescriptor> ValidSurfaceDescriptorForRemoteCanvas2d(
const layers::SurfaceDescriptor&);
} // namespace dom
namespace CanvasUtils {
bool GetCanvasContextType(const nsAString&, dom::CanvasContextType* const);
} // namespace CanvasUtils
} // namespace mozilla
#endif // MOZILLA_DOM_CANVASRENDERINGCONTEXTHELPER_H_
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