CanvasContext.h - mozsearch

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/* -*- Mode: C++; tab-width: 4; 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 GPU_CanvasContext_H_

#define GPU_CanvasContext_H_

#include "nsICanvasRenderingContextInternal.h"

#include "nsWrapperCache.h"

#include "ObjectModel.h"

#include "mozilla/layers/LayersTypes.h"

#include "mozilla/webrender/WebRenderAPI.h"

namespace mozilla {

namespace dom {

class OwningHTMLCanvasElementOrOffscreenCanvas;

class Promise;

struct GPUCanvasConfiguration;

enum class GPUTextureFormat : uint8_t;

}  // namespace dom

namespace webgpu {

class Adapter;

class Texture;

class CanvasContext final : public nsICanvasRenderingContextInternal,

                            public nsWrapperCache {

 private:

  virtual ~CanvasContext();

  void Cleanup();

 public:

  // nsISupports interface + CC

  NS_DECL_CYCLE_COLLECTING_ISUPPORTS

  NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(CanvasContext)

  CanvasContext();

  JSObject* WrapObject(JSContext* aCx,

                       JS::Handle<JSObject*> aGivenProto) override;

 public:  // nsICanvasRenderingContextInternal

  int32_t GetWidth() override { return mCanvasSize.width; }

  int32_t GetHeight() override { return mCanvasSize.height; }

  NS_IMETHOD SetDimensions(int32_t aWidth, int32_t aHeight) override;

  NS_IMETHOD InitializeWithDrawTarget(

      nsIDocShell* aShell, NotNull<gfx::DrawTarget*> aTarget) override {

    return NS_OK;

  bool UpdateWebRenderCanvasData(mozilla::nsDisplayListBuilder* aBuilder,

                                 WebRenderCanvasData* aCanvasData) override;

  bool InitializeCanvasRenderer(nsDisplayListBuilder* aBuilder,

                                layers::CanvasRenderer* aRenderer) override;

  mozilla::UniquePtr<uint8_t[]> GetImageBuffer(

      int32_t* out_format, gfx::IntSize* out_imageSize) override;

  NS_IMETHOD GetInputStream(const char* aMimeType,

                            const nsAString& aEncoderOptions,

                            nsIInputStream** aStream) override;

  already_AddRefed<mozilla::gfx::SourceSurface> GetSurfaceSnapshot(

      gfxAlphaType* aOutAlphaType) override;

  void SetOpaqueValueFromOpaqueAttr(bool aOpaqueAttrValue) override {}

  bool GetIsOpaque() override { return true; }

  void ResetBitmap() override { Unconfigure(); }

  void MarkContextClean() override {}

  NS_IMETHOD Redraw(const gfxRect& aDirty) override { return NS_OK; }

  void DidRefresh() override {}

  void MarkContextCleanForFrameCapture() override {}

  Watchable<FrameCaptureState>* GetFrameCaptureState() override {

    return nullptr;

  Maybe<layers::SurfaceDescriptor> GetFrontBuffer(WebGLFramebufferJS*,

                                                  const bool) override;

  already_AddRefed<layers::FwdTransactionTracker> UseCompositableForwarder(

      layers::CompositableForwarder* aForwarder) override;

  bool IsOffscreenCanvas() { return !!mOffscreenCanvas; }

 public:

  void GetCanvas(dom::OwningHTMLCanvasElementOrOffscreenCanvas&) const;

  void Configure(const dom::GPUCanvasConfiguration& aConfig);

  void Unconfigure();

  RefPtr<Texture> GetCurrentTexture(ErrorResult& aRv);

  void MaybeQueueSwapChainPresent();

  Maybe<layers::SurfaceDescriptor> SwapChainPresent();

  void ForceNewFrame();

  void InvalidateCanvasContent();

 private:

  gfx::IntSize mCanvasSize;

  std::unique_ptr<dom::GPUCanvasConfiguration> mConfig;

  bool mPendingSwapChainPresent = false;

  bool mWaitingCanvasRendererInitialized = false;

  RefPtr<WebGPUChild> mBridge;

  RefPtr<Texture> mTexture;

  gfx::SurfaceFormat mGfxFormat = gfx::SurfaceFormat::R8G8B8A8;

  Maybe<layers::RemoteTextureId> mLastRemoteTextureId;

  Maybe<layers::RemoteTextureOwnerId> mRemoteTextureOwnerId;

  RefPtr<layers::FwdTransactionTracker> mFwdTransactionTracker;

  bool mUseExternalTextureInSwapChain = false;

  bool mNewTextureRequested = false;

};

}  // namespace webgpu

}  // namespace mozilla

#endif  // GPU_CanvasContext_H_