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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* 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_OFFSCREENCANVAS_H_
#define MOZILLA_DOM_OFFSCREENCANVAS_H_
#include "gfxTypes.h"
#include "mozilla/dom/CanvasRenderingContextHelper.h"
#include "mozilla/dom/ImageEncoder.h"
#include "mozilla/dom/OffscreenCanvasDisplayHelper.h"
#include "mozilla/DOMEventTargetHelper.h"
#include "mozilla/layers/LayersTypes.h"
#include "mozilla/Maybe.h"
#include "mozilla/RefPtr.h"
#include "nsCycleCollectionParticipant.h"
struct JSContext;
namespace mozilla {
class CancelableRunnable;
class ErrorResult;
namespace gfx {
class SourceSurface;
}
namespace dom {
enum class OffscreenRenderingContextId : uint8_t;
class Blob;
class EncodeCompleteCallback;
class OffscreenCanvasDisplayHelper;
class ImageBitmap;
struct ImageEncodeOptions;
using OwningOffscreenRenderingContext = class
OwningOffscreenCanvasRenderingContext2DOrImageBitmapRenderingContextOrWebGLRenderingContextOrWebGL2RenderingContextOrGPUCanvasContext;
// This is helper class for transferring OffscreenCanvas to worker thread.
// Because OffscreenCanvas is not thread-safe. So we cannot pass Offscreen-
// Canvas to worker thread directly. Thus, we create this helper class and
// store necessary data in it then pass it to worker thread.
struct OffscreenCanvasCloneData final {
OffscreenCanvasCloneData(OffscreenCanvasDisplayHelper* aDisplay,
uint32_t aWidth, uint32_t aHeight,
layers::LayersBackend aCompositorBackend,
layers::TextureType aTextureType, bool aNeutered,
bool aIsWriteOnly);
~OffscreenCanvasCloneData();
RefPtr<OffscreenCanvasDisplayHelper> mDisplay;
uint32_t mWidth;
uint32_t mHeight;
layers::LayersBackend mCompositorBackendType;
layers::TextureType mTextureType;
bool mNeutered;
bool mIsWriteOnly;
};
class OffscreenCanvas final : public DOMEventTargetHelper,
public CanvasRenderingContextHelper {
public:
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(OffscreenCanvas,
DOMEventTargetHelper)
IMPL_EVENT_HANDLER(contextlost);
IMPL_EVENT_HANDLER(contextrestored);
OffscreenCanvas(nsIGlobalObject* aGlobal, uint32_t aWidth, uint32_t aHeight,
layers::LayersBackend aCompositorBackend,
layers::TextureType aTextureType,
OffscreenCanvasDisplayHelper* aDisplay);
nsIGlobalObject* GetParentObject() const { return GetOwnerGlobal(); }
virtual JSObject* WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) override;
static already_AddRefed<OffscreenCanvas> Constructor(
const GlobalObject& aGlobal, uint32_t aWidth, uint32_t aHeight);
void ClearResources();
uint32_t Width() const { return mWidth; }
uint32_t Height() const { return mHeight; }
void SetWidth(uint32_t aWidth, ErrorResult& aRv);
void SetHeight(uint32_t aHeight, ErrorResult& aRv);
void GetContext(JSContext* aCx, const OffscreenRenderingContextId& aContextId,
JS::Handle<JS::Value> aContextOptions,
Nullable<OwningOffscreenRenderingContext>& aResult,
ErrorResult& aRv);
already_AddRefed<ImageBitmap> TransferToImageBitmap(ErrorResult& aRv);
already_AddRefed<Promise> ConvertToBlob(const ImageEncodeOptions& aOptions,
ErrorResult& aRv);
already_AddRefed<Promise> ToBlob(JSContext* aCx, const nsAString& aType,
JS::Handle<JS::Value> aParams,
ErrorResult& aRv);
nsICanvasRenderingContextInternal* GetContext() const {
return mCurrentContext;
}
CanvasContextType GetContextType() const { return mCurrentContextType; }
already_AddRefed<gfx::SourceSurface> GetSurfaceSnapshot(
gfxAlphaType* aOutAlphaType = nullptr);
static already_AddRefed<OffscreenCanvas> CreateFromCloneData(
nsIGlobalObject* aGlobal, OffscreenCanvasCloneData* aData);
// Return true on main-thread, and return gfx.offscreencanvas.enabled
// on worker thread.
static bool PrefEnabledOnWorkerThread(JSContext* aCx, JSObject* aObj);
OffscreenCanvasCloneData* ToCloneData();
void UpdateDisplayData(const OffscreenCanvasDisplayData& aData);
void CommitFrameToCompositor();
void DequeueCommitToCompositor();
void QueueCommitToCompositor();
virtual bool GetOpaqueAttr() override { return false; }
virtual nsIntSize GetWidthHeight() override {
return nsIntSize(mWidth, mHeight);
}
virtual already_AddRefed<nsICanvasRenderingContextInternal> CreateContext(
CanvasContextType aContextType) override;
void SetNeutered() {
mWidth = 0;
mHeight = 0;
mNeutered = true;
}
bool MayNeuter() const { return !mNeutered && !mCurrentContext; }
void SetWriteOnly() { mIsWriteOnly = true; }
bool IsWriteOnly() const { return mIsWriteOnly; }
layers::LayersBackend GetCompositorBackendType() const {
return mCompositorBackendType;
}
bool ShouldResistFingerprinting() const;
bool IsTransferredFromElement() const { return !!mDisplay; }
private:
~OffscreenCanvas();
already_AddRefed<EncodeCompleteCallback> CreateEncodeCompleteCallback(
Promise* aPromise);
void CanvasAttrChanged() {
ErrorResult dummy;
UpdateContext(nullptr, JS::NullHandleValue, dummy);
}
bool mNeutered;
bool mIsWriteOnly;
uint32_t mWidth;
uint32_t mHeight;
layers::LayersBackend mCompositorBackendType;
layers::TextureType mTextureType;
RefPtr<OffscreenCanvasDisplayHelper> mDisplay;
RefPtr<CancelableRunnable> mPendingCommit;
Maybe<OffscreenCanvasDisplayData> mPendingUpdate;
};
} // namespace dom
} // namespace mozilla
#endif // MOZILLA_DOM_OFFSCREENCANVAS_H_
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