1 files changed, 153 insertions, 0 deletions
diff --git a/gfx/layers/CanvasRenderer.h b/gfx/layers/CanvasRenderer.h
new file mode 100644
index 0000000000..ca3ae088cc
--- /dev/null
+++ b/gfx/layers/CanvasRenderer.h
@@ -0,0 +1,153 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 GFX_CANVASRENDERER_H
+#define GFX_CANVASRENDERER_H
+
+#include <memory>            // for weak_ptr
+#include <stdint.h>          // for uint32_t
+#include "GLContextTypes.h"  // for GLContext
+#include "gfxContext.h"      // for gfxContext, etc
+#include "gfxTypes.h"
+#include "gfxPlatform.h"          // for gfxImageFormat
+#include "mozilla/Assertions.h"   // for MOZ_ASSERT, etc
+#include "mozilla/Preferences.h"  // for Preferences
+#include "mozilla/RefPtr.h"       // for RefPtr
+#include "mozilla/gfx/2D.h"       // for DrawTarget
+#include "mozilla/mozalloc.h"     // for operator delete, etc
+#include "mozilla/WeakPtr.h"      // for WeakPtr
+#include "nsISupportsImpl.h"      // for MOZ_COUNT_CTOR, etc
+
+class nsICanvasRenderingContextInternal;
+
+namespace mozilla {
+namespace layers {
+
+class ClientCanvasRenderer;
+class KnowsCompositor;
+class PersistentBufferProvider;
+class WebRenderCanvasRendererAsync;
+
+TextureType TexTypeForWebgl(KnowsCompositor*);
+
+struct CanvasRendererData final {
+  CanvasRendererData();
+  ~CanvasRendererData();
+
+  std::weak_ptr<nsICanvasRenderingContextInternal* const>
+      mContext;  // weak_ptr to ptr (bug 1635644)
+
+  // The size of the canvas content
+  gfx::IntSize mSize = {0, 0};
+
+  bool mDoPaintCallbacks = false;
+  bool mIsOpaque = true;
+  bool mIsAlphaPremult = true;
+
+  gl::OriginPos mOriginPos = gl::OriginPos::TopLeft;
+
+  nsICanvasRenderingContextInternal* GetContext() const {
+    const auto ptrToPtr = mContext.lock();
+    if (!ptrToPtr) return nullptr;
+    return *ptrToPtr;
+  }
+};
+
+// Based class which used for canvas rendering. There are many derived classes
+// for different purposes. such as:
+//
+// ShareableCanvasRenderer provides IPC capabilities that allow sending canvas
+// content over IPC. This is pure virtual class because the IPC handling is
+// different in different LayerManager. So that we have following classes
+// inherit ShareableCanvasRenderer.
+//
+// ClientCanvasRenderer inherits ShareableCanvasRenderer and be used in
+// ClientCanvasLayer.
+// WebRenderCanvasRenderer inherits ShareableCanvasRenderer and provides all
+// functionality that WebRender uses.
+// WebRenderCanvasRendererAsync inherits WebRenderCanvasRenderer and be used in
+// layers-free mode of WebRender.
+//
+// class diagram:
+//
+//                       +--------------+
+//                       |CanvasRenderer|
+//                       +-------+------+
+//                               ^
+//                               |
+//                   +-----------+-----------+
+//                   |ShareableCanvasRenderer|
+//                   +-----+-----------------+
+//                         ^      ^
+//           +-------------+      +-------+
+//           |                            |
+// +--------------------+       +---------+-------------+
+// |ClientCanvasRenderer|       |WebRenderCanvasRenderer|
+// +--------------------+       +-----------+-----------+
+//                                          ^
+//                                          |
+//                           +-------------+--------------+
+//                           |WebRenderCanvasRendererAsync|
+//                           +----------------------------+
+
+class BorrowedSourceSurface final {
+ public:
+  const WeakPtr<PersistentBufferProvider> mReturnTo;
+  const RefPtr<gfx::SourceSurface> mSurf;  /// non-null
+
+  BorrowedSourceSurface(PersistentBufferProvider*, RefPtr<gfx::SourceSurface>);
+  ~BorrowedSourceSurface();
+};
+
+// -
+
+class CanvasRenderer : public RefCounted<CanvasRenderer> {
+  friend class CanvasRendererSourceSurface;
+
+ public:
+  MOZ_DECLARE_REFCOUNTED_TYPENAME(CanvasRenderer)
+
+ private:
+  bool mDirty = false;
+
+ protected:
+  CanvasRendererData mData;
+
+ public:
+  explicit CanvasRenderer();
+  virtual ~CanvasRenderer();
+
+ public:
+  virtual void Initialize(const CanvasRendererData&);
+  virtual bool IsDataValid(const CanvasRendererData&) const;
+
+  virtual void ClearCachedResources() {}
+  virtual void DisconnectClient() {}
+
+  const gfx::IntSize& GetSize() const { return mData.mSize; }
+  bool IsOpaque() const { return mData.mIsOpaque; }
+  bool YIsDown() const { return mData.mOriginPos == gl::OriginPos::TopLeft; }
+
+  void SetDirty() { mDirty = true; }
+  void ResetDirty() { mDirty = false; }
+  bool IsDirty() const { return mDirty; }
+
+  virtual ClientCanvasRenderer* AsClientCanvasRenderer() { return nullptr; }
+  virtual WebRenderCanvasRendererAsync* AsWebRenderCanvasRendererAsync() {
+    return nullptr;
+  }
+
+  std::shared_ptr<BorrowedSourceSurface> BorrowSnapshot(
+      bool requireAlphaPremult = true) const;
+
+  void FirePreTransactionCallback() const;
+  void FireDidTransactionCallback() const;
+};
+
+}  // namespace layers
+}  // namespace mozilla
+
+#endif