forked from mirrors/gecko-dev
121 lines
3.8 KiB
C++
121 lines
3.8 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef ImageBitmapRenderingContext_h
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#define ImageBitmapRenderingContext_h
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#include "mozilla/dom/ImageBitmap.h"
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#include "mozilla/gfx/2D.h"
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#include "mozilla/gfx/DataSurfaceHelpers.h"
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#include "mozilla/gfx/Point.h"
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#include "mozilla/layers/WebRenderUserData.h"
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#include "imgIEncoder.h"
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#include "ImageEncoder.h"
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#include "nsICanvasRenderingContextInternal.h"
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#include "nsWrapperCache.h"
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namespace mozilla {
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namespace gfx {
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class DataSourceSurface;
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class DrawTarget;
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class SourceSurface;
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} // namespace gfx
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namespace layers {
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class Image;
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class ImageContainer;
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} // namespace layers
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namespace dom {
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/**
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* The purpose of ImageBitmapRenderingContext is to provide a faster and
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* efficient way to display ImageBitmap. Simply call TransferFromImageBitmap()
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* then we'll transfer the surface of ImageBitmap to this context and then to
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* use it to display.
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*
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* See more details in spec: https://wiki.whatwg.org/wiki/OffscreenCanvas
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*/
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class ImageBitmapRenderingContext final
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: public nsICanvasRenderingContextInternal,
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public nsWrapperCache {
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virtual ~ImageBitmapRenderingContext();
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public:
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ImageBitmapRenderingContext();
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virtual JSObject* WrapObject(JSContext* aCx,
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JS::Handle<JSObject*> aGivenProto) override;
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// nsISupports interface + CC
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(ImageBitmapRenderingContext)
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void GetCanvas(
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Nullable<OwningHTMLCanvasElementOrOffscreenCanvas>& retval) const;
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void TransferImageBitmap(ImageBitmap& aImageBitmap, ErrorResult& aRv);
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void TransferFromImageBitmap(ImageBitmap* aImageBitmap, ErrorResult& aRv);
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// nsICanvasRenderingContextInternal
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virtual int32_t GetWidth() override { return mWidth; }
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virtual int32_t GetHeight() override { return mHeight; }
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NS_IMETHOD SetDimensions(int32_t aWidth, int32_t aHeight) override;
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NS_IMETHOD InitializeWithDrawTarget(
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nsIDocShell* aDocShell, NotNull<gfx::DrawTarget*> aTarget) override;
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virtual mozilla::UniquePtr<uint8_t[]> GetImageBuffer(
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int32_t* out_format, gfx::IntSize* out_imageSize) override;
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NS_IMETHOD GetInputStream(const char* aMimeType,
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const nsAString& aEncoderOptions,
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nsIInputStream** aStream) override;
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virtual already_AddRefed<mozilla::gfx::SourceSurface> GetSurfaceSnapshot(
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gfxAlphaType* aOutAlphaType) override;
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virtual void SetOpaqueValueFromOpaqueAttr(bool aOpaqueAttrValue) override;
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virtual bool GetIsOpaque() override;
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void ResetBitmap() override;
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virtual already_AddRefed<layers::Image> GetAsImage() override {
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return ClipToIntrinsicSize();
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}
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bool UpdateWebRenderCanvasData(nsDisplayListBuilder* aBuilder,
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WebRenderCanvasData* aCanvasData) override;
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virtual void MarkContextClean() override;
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NS_IMETHOD Redraw(const gfxRect& aDirty) override;
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virtual void DidRefresh() override;
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void MarkContextCleanForFrameCapture() override {
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mFrameCaptureState = FrameCaptureState::CLEAN;
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}
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Watchable<FrameCaptureState>* GetFrameCaptureState() override {
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return &mFrameCaptureState;
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}
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protected:
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already_AddRefed<gfx::DataSourceSurface> MatchWithIntrinsicSize();
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already_AddRefed<layers::Image> ClipToIntrinsicSize();
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int32_t mWidth;
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int32_t mHeight;
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RefPtr<layers::Image> mImage;
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/**
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* Flag to avoid unnecessary surface copies to FrameCaptureListeners in the
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* case when the canvas is not currently being drawn into and not rendered
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* but canvas capturing is still ongoing.
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*/
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Watchable<FrameCaptureState> mFrameCaptureState;
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};
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} // namespace dom
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} // namespace mozilla
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#endif /* ImageBitmapRenderingContext_h */
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