/* -*- 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 "ObjectModel.h"
#include "mozilla/layers/LayersTypes.h"
#include "mozilla/webgpu/WebGPUTypes.h"
#include "mozilla/webrender/WebRenderAPI.h"
#include "nsICanvasRenderingContextInternal.h"
#include "nsWrapperCache.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();

 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(
      mozilla::CanvasUtils::ImageExtraction aExtractionBehavior,
      int32_t* out_format, gfx::IntSize* out_imageSize) override;
  NS_IMETHOD GetInputStream(
      const char* aMimeType, const nsAString& aEncoderOptions,
      mozilla::CanvasUtils::ImageExtraction aExtractionBehavior,
      const nsACString& aRandomizationKey, nsIInputStream** aStream) override;
  already_AddRefed<gfx::SourceSurface> GetSurfaceSnapshot(
      gfxAlphaType* aOutAlphaType) override;

  void SetOpaqueValueFromOpaqueAttr(bool aOpaqueAttrValue) override {}
  bool GetIsOpaque() override;

  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, ErrorResult& aRv);
  void Unconfigure();

  void GetConfiguration(dom::Nullable<dom::GPUCanvasConfiguration>& aRv);
  RefPtr<Texture> GetCurrentTexture(ErrorResult& aRv);
  void MaybeQueueSwapChainPresent();
  Maybe<layers::SurfaceDescriptor> SwapChainPresent();
  void ForceNewFrame();
  void InvalidateCanvasContent();

 private:
  gfx::IntSize mCanvasSize;
  std::unique_ptr<dom::GPUCanvasConfiguration> mConfiguration;
  bool mPendingSwapChainPresent = false;
  bool mWaitingCanvasRendererInitialized = false;

  RefPtr<WebGPUChild> mChild;
  RefPtr<Texture> mCurrentTexture;
  gfx::SurfaceFormat mGfxFormat = gfx::SurfaceFormat::R8G8B8A8;

  Maybe<layers::RemoteTextureId> mLastRemoteTextureId;
  Maybe<layers::RemoteTextureOwnerId> mRemoteTextureOwnerId;
  RefPtr<layers::FwdTransactionTracker> mFwdTransactionTracker;
  bool mUseSharedTextureInSwapChain = false;
  bool mNewTextureRequested = false;
};

typedef AutoTArray<WeakPtr<CanvasContext>, 1> CanvasContextArray;

}  // namespace webgpu
}  // namespace mozilla

#endif  // GPU_CanvasContext_H_
