Add m-esr52 at 52.6.0

1 files changed, 216 insertions, 0 deletions

diff --git a/gfx/layers/client/CanvasClient.h b/gfx/layers/client/CanvasClient.h
new file mode 100644
index 000000000..cd88d02ab
--- /dev/null
+++ b/gfx/layers/client/CanvasClient.h
@@ -0,0 +1,216 @@
+/* -*- Mode: C++; tab-width: 20; 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 MOZILLA_GFX_CANVASCLIENT_H
+#define MOZILLA_GFX_CANVASCLIENT_H
+
+#include "mozilla/Assertions.h"         // for MOZ_ASSERT, etc
+#include "mozilla/Attributes.h"         // for override
+#include "mozilla/RefPtr.h"             // for RefPtr, already_AddRefed
+#include "mozilla/layers/CompositableClient.h"  // for CompositableClient
+#include "mozilla/layers/CompositorTypes.h"  // for TextureInfo, etc
+#include "mozilla/layers/LayersSurfaces.h"  // for SurfaceDescriptor
+#include "mozilla/layers/TextureClient.h"  // for TextureClient, etc
+#include "mozilla/layers/PersistentBufferProvider.h"
+
+// Fix X11 header brain damage that conflicts with MaybeOneOf::None
+#undef None
+#include "mozilla/MaybeOneOf.h"
+
+#include "mozilla/mozalloc.h"           // for operator delete
+
+#include "mozilla/gfx/Point.h"          // for IntSize
+#include "mozilla/gfx/Types.h"          // for SurfaceFormat
+
+namespace mozilla {
+namespace layers {
+
+class AsyncCanvasRenderer;
+class ClientCanvasLayer;
+class CompositableForwarder;
+class ShadowableLayer;
+class SharedSurfaceTextureClient;
+
+/**
+ * Compositable client for 2d and webgl canvas.
+ */
+class CanvasClient : public CompositableClient
+{
+public:
+  typedef MaybeOneOf<ClientCanvasLayer*, AsyncCanvasRenderer*> Renderer;
+
+  /**
+   * Creates, configures, and returns a new canvas client. If necessary, a
+   * message will be sent to the compositor to create a corresponding image
+   * host.
+   */
+  enum CanvasClientType {
+    CanvasClientSurface,
+    CanvasClientGLContext,
+    CanvasClientTypeShSurf,
+    CanvasClientAsync, // webgl on workers
+  };
+  static already_AddRefed<CanvasClient> CreateCanvasClient(CanvasClientType aType,
+                                                       CompositableForwarder* aFwd,
+                                                       TextureFlags aFlags);
+
+  CanvasClient(CompositableForwarder* aFwd, TextureFlags aFlags)
+    : CompositableClient(aFwd, aFlags)
+    , mFrameID(0)
+  {
+    mTextureFlags = aFlags;
+  }
+
+  virtual ~CanvasClient() {}
+
+  virtual void Clear() {};
+
+  virtual void Update(gfx::IntSize aSize, ClientCanvasLayer* aLayer) = 0;
+
+  virtual bool AddTextureClient(TextureClient* aTexture) override
+  {
+    ++mFrameID;
+    return CompositableClient::AddTextureClient(aTexture);
+  }
+
+  virtual void UpdateAsync(AsyncCanvasRenderer* aRenderer) {}
+
+  virtual void UpdateFromTexture(TextureClient* aTexture) {}
+
+  virtual void Updated() { }
+
+protected:
+  int32_t mFrameID;
+};
+
+// Used for 2D canvases and WebGL canvas on non-GL systems where readback is requried.
+class CanvasClient2D : public CanvasClient
+{
+public:
+  CanvasClient2D(CompositableForwarder* aLayerForwarder,
+                 TextureFlags aFlags)
+    : CanvasClient(aLayerForwarder, aFlags)
+  {
+  }
+
+  TextureInfo GetTextureInfo() const override
+  {
+    return TextureInfo(CompositableType::IMAGE, mTextureFlags);
+  }
+
+  virtual void Clear() override
+  {
+    mBackBuffer = mFrontBuffer = nullptr;
+  }
+
+  virtual void Update(gfx::IntSize aSize, ClientCanvasLayer* aLayer) override;
+
+  virtual void UpdateFromTexture(TextureClient* aBuffer) override;
+
+  virtual bool AddTextureClient(TextureClient* aTexture) override
+  {
+    return CanvasClient::AddTextureClient(aTexture);
+  }
+
+  virtual void OnDetach() override
+  {
+    mBackBuffer = mFrontBuffer = nullptr;
+  }
+
+private:
+  already_AddRefed<TextureClient>
+    CreateTextureClientForCanvas(gfx::SurfaceFormat aFormat,
+                                 gfx::IntSize aSize,
+                                 TextureFlags aFlags,
+                                 ClientCanvasLayer* aLayer);
+
+  RefPtr<TextureClient> mBackBuffer;
+  RefPtr<TextureClient> mFrontBuffer;
+  // We store this texture separately to make sure it is not written into
+  // in Update() if for some silly reason we end up alternating between
+  // UpdateFromTexture and Update.
+  // This code is begging for a cleanup. The situation described above should
+  // not be made possible.
+  RefPtr<TextureClient> mBufferProviderTexture;
+};
+
+// Used for GL canvases where we don't need to do any readback, i.e., with a
+// GL backend.
+class CanvasClientSharedSurface : public CanvasClient
+{
+private:
+  RefPtr<SharedSurfaceTextureClient> mShSurfClient;
+  RefPtr<TextureClient> mReadbackClient;
+  RefPtr<TextureClient> mFront;
+  RefPtr<TextureClient> mNewFront;
+
+  void ClearSurfaces();
+
+public:
+  CanvasClientSharedSurface(CompositableForwarder* aLayerForwarder,
+                            TextureFlags aFlags);
+
+  ~CanvasClientSharedSurface();
+
+  virtual TextureInfo GetTextureInfo() const override {
+    return TextureInfo(CompositableType::IMAGE);
+  }
+
+  virtual void Clear() override {
+    ClearSurfaces();
+  }
+
+  virtual void Update(gfx::IntSize aSize,
+                      ClientCanvasLayer* aLayer) override;
+  void UpdateRenderer(gfx::IntSize aSize, Renderer& aRenderer);
+
+  virtual void UpdateAsync(AsyncCanvasRenderer* aRenderer) override;
+
+  virtual void Updated() override;
+
+  virtual void OnDetach() override;
+};
+
+/**
+ * Used for OMT<canvas> uploads using the image bridge protocol.
+ * Actual CanvasClient is on the ImageBridgeChild thread, so we
+ * only forward its AsyncID here
+ */
+class CanvasClientBridge final : public CanvasClient
+{
+public:
+  CanvasClientBridge(CompositableForwarder* aLayerForwarder,
+                     TextureFlags aFlags)
+    : CanvasClient(aLayerForwarder, aFlags)
+    , mAsyncID(0)
+    , mLayer(nullptr)
+  {
+  }
+
+  TextureInfo GetTextureInfo() const override
+  {
+    return TextureInfo(CompositableType::IMAGE);
+  }
+
+  virtual void Update(gfx::IntSize aSize, ClientCanvasLayer* aLayer) override
+  {
+  }
+
+  virtual void UpdateAsync(AsyncCanvasRenderer* aRenderer) override;
+
+  void SetLayer(ShadowableLayer* aLayer)
+  {
+    mLayer = aLayer;
+  }
+
+protected:
+  uint64_t mAsyncID;
+  ShadowableLayer* mLayer;
+};
+
+} // namespace layers
+} // namespace mozilla
+
+#endif