1 files changed, 316 insertions, 0 deletions
diff --git a/gfx/layers/composite/CompositableHost.h b/gfx/layers/composite/CompositableHost.h
new file mode 100644
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+++ b/gfx/layers/composite/CompositableHost.h
@@ -0,0 +1,316 @@
+/* -*- 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_BUFFERHOST_H
+#define MOZILLA_GFX_BUFFERHOST_H
+
+#include <stdint.h>                     // for uint64_t
+#include <stdio.h>                      // for FILE
+#include "gfxRect.h"                    // for gfxRect
+#include "mozilla/Assertions.h"         // for MOZ_ASSERT, etc
+#include "mozilla/Attributes.h"         // for override
+#include "mozilla/RefPtr.h"             // for RefPtr, RefCounted, etc
+#include "mozilla/gfx/MatrixFwd.h"      // for Matrix4x4
+#include "mozilla/gfx/Point.h"          // for Point
+#include "mozilla/gfx/Rect.h"           // for Rect
+#include "mozilla/gfx/Types.h"          // for SamplingFilter
+#include "mozilla/ipc/ProtocolUtils.h"
+#include "mozilla/layers/Compositor.h"  // for Compositor
+#include "mozilla/layers/CompositorTypes.h"  // for TextureInfo, etc
+#include "mozilla/layers/Effects.h"     // for Texture Effect
+#include "mozilla/layers/LayersTypes.h"  // for LayerRenderState, etc
+#include "mozilla/layers/LayersMessages.h"
+#include "mozilla/layers/TextureHost.h" // for TextureHost
+#include "mozilla/mozalloc.h"           // for operator delete
+#include "nsCOMPtr.h"                   // for already_AddRefed
+#include "nsRegion.h"                   // for nsIntRegion
+#include "nscore.h"                     // for nsACString
+#include "Units.h"                      // for CSSToScreenScale
+
+namespace mozilla {
+namespace gfx {
+class DataSourceSurface;
+} // namespace gfx
+
+namespace layers {
+
+class Layer;
+class LayerComposite;
+class Compositor;
+class ImageContainerParent;
+class ThebesBufferData;
+class TiledContentHost;
+class CompositableParentManager;
+class PCompositableParent;
+struct EffectChain;
+
+/**
+ * The compositor-side counterpart to CompositableClient. Responsible for
+ * updating textures and data about textures from IPC and how textures are
+ * composited (tiling, double buffering, etc.).
+ *
+ * Update (for images/canvases) and UpdateThebes (for Thebes) are called during
+ * the layers transaction to update the Compositbale's textures from the
+ * content side. The actual update (and any syncronous upload) is done by the
+ * TextureHost, but it is coordinated by the CompositableHost.
+ *
+ * Composite is called by the owning layer when it is composited. CompositableHost
+ * will use its TextureHost(s) and call Compositor::DrawQuad to do the actual
+ * rendering.
+ */
+class CompositableHost
+{
+protected:
+  virtual ~CompositableHost();
+
+public:
+  NS_INLINE_DECL_REFCOUNTING(CompositableHost)
+  explicit CompositableHost(const TextureInfo& aTextureInfo);
+
+  static already_AddRefed<CompositableHost> Create(const TextureInfo& aTextureInfo);
+
+  virtual CompositableType GetType() = 0;
+
+  // If base class overrides, it should still call the parent implementation
+  virtual void SetCompositor(Compositor* aCompositor);
+
+  // composite the contents of this buffer host to the compositor's surface
+  virtual void Composite(LayerComposite* aLayer,
+                         EffectChain& aEffectChain,
+                         float aOpacity,
+                         const gfx::Matrix4x4& aTransform,
+                         const gfx::SamplingFilter aSamplingFilter,
+                         const gfx::IntRect& aClipRect,
+                         const nsIntRegion* aVisibleRegion = nullptr) = 0;
+
+  /**
+   * Update the content host.
+   * aUpdated is the region which should be updated
+   * aUpdatedRegionBack is the region in aNewBackResult which has been updated
+   */
+  virtual bool UpdateThebes(const ThebesBufferData& aData,
+                            const nsIntRegion& aUpdated,
+                            const nsIntRegion& aOldValidRegionBack,
+                            nsIntRegion* aUpdatedRegionBack)
+  {
+    NS_ERROR("should be implemented or not used");
+    return false;
+  }
+
+  /**
+   * Returns the front buffer.
+   * *aPictureRect (if non-null, and the returned TextureHost is non-null)
+   * is set to the picture rect.
+   */
+  virtual TextureHost* GetAsTextureHost(gfx::IntRect* aPictureRect = nullptr) {
+    return nullptr;
+  }
+
+  virtual LayerRenderState GetRenderState() = 0;
+
+  virtual gfx::IntSize GetImageSize() const
+  {
+    MOZ_ASSERT(false, "Should have been overridden");
+    return gfx::IntSize();
+  }
+
+  /**
+   * Adds a mask effect using this texture as the mask, if possible.
+   * @return true if the effect was added, false otherwise.
+   */
+  bool AddMaskEffect(EffectChain& aEffects,
+                     const gfx::Matrix4x4& aTransform);
+
+  void RemoveMaskEffect();
+
+  Compositor* GetCompositor() const
+  {
+    return mCompositor;
+  }
+
+  Layer* GetLayer() const { return mLayer; }
+  void SetLayer(Layer* aLayer) { mLayer = aLayer; }
+
+  virtual void SetImageContainer(ImageContainerParent* aImageContainer) {}
+
+  virtual TiledContentHost* AsTiledContentHost() { return nullptr; }
+
+  typedef uint32_t AttachFlags;
+  static const AttachFlags NO_FLAGS = 0;
+  static const AttachFlags ALLOW_REATTACH = 1;
+  static const AttachFlags KEEP_ATTACHED = 2;
+  static const AttachFlags FORCE_DETACH = 2;
+
+  virtual void Attach(Layer* aLayer,
+                      Compositor* aCompositor,
+                      AttachFlags aFlags = NO_FLAGS)
+  {
+    MOZ_ASSERT(aCompositor, "Compositor is required");
+    NS_ASSERTION(aFlags & ALLOW_REATTACH || !mAttached,
+                 "Re-attaching compositables must be explicitly authorised");
+    SetCompositor(aCompositor);
+    SetLayer(aLayer);
+    mAttached = true;
+    mKeepAttached = aFlags & KEEP_ATTACHED;
+  }
+  // Detach this compositable host from its layer.
+  // If we are used for async video, then it is not safe to blindly detach since
+  // we might be re-attached to a different layer. aLayer is the layer which the
+  // caller expects us to be attached to, we will only detach if we are in fact
+  // attached to that layer. If we are part of a normal layer, then we will be
+  // detached in any case. if aLayer is null, then we will only detach if we are
+  // not async.
+  // Only force detach if the IPDL tree is being shutdown.
+  virtual void Detach(Layer* aLayer = nullptr, AttachFlags aFlags = NO_FLAGS)
+  {
+    if (!mKeepAttached ||
+        aLayer == mLayer ||
+        aFlags & FORCE_DETACH) {
+      SetLayer(nullptr);
+      mAttached = false;
+      mKeepAttached = false;
+    }
+  }
+  bool IsAttached() { return mAttached; }
+
+  static void
+  ReceivedDestroy(PCompositableParent* aActor);
+
+  virtual void Dump(std::stringstream& aStream,
+                    const char* aPrefix="",
+                    bool aDumpHtml=false) { }
+  static void DumpTextureHost(std::stringstream& aStream, TextureHost* aTexture);
+
+  virtual already_AddRefed<gfx::DataSourceSurface> GetAsSurface() { return nullptr; }
+
+  virtual void PrintInfo(std::stringstream& aStream, const char* aPrefix) = 0;
+
+  struct TimedTexture {
+    CompositableTextureHostRef mTexture;
+    TimeStamp mTimeStamp;
+    gfx::IntRect mPictureRect;
+    int32_t mFrameID;
+    int32_t mProducerID;
+  };
+  virtual void UseTextureHost(const nsTArray<TimedTexture>& aTextures);
+  virtual void UseComponentAlphaTextures(TextureHost* aTextureOnBlack,
+                                         TextureHost* aTextureOnWhite);
+  virtual void UseOverlaySource(OverlaySource aOverlay,
+                                const gfx::IntRect& aPictureRect) { }
+
+  virtual void RemoveTextureHost(TextureHost* aTexture);
+
+  // Called every time this is composited
+  void BumpFlashCounter() {
+    mFlashCounter = mFlashCounter >= DIAGNOSTIC_FLASH_COUNTER_MAX
+                  ? DIAGNOSTIC_FLASH_COUNTER_MAX : mFlashCounter + 1;
+  }
+
+  static PCompositableParent*
+  CreateIPDLActor(CompositableParentManager* mgr,
+                  const TextureInfo& textureInfo,
+                  uint64_t asyncID,
+                  PImageContainerParent* aImageContainer = nullptr);
+
+  static bool DestroyIPDLActor(PCompositableParent* actor);
+
+  static CompositableHost* FromIPDLActor(PCompositableParent* actor);
+
+  uint64_t GetCompositorID() const { return mCompositorID; }
+
+  uint64_t GetAsyncID() const { return mAsyncID; }
+
+  void SetCompositorID(uint64_t aID) { mCompositorID = aID; }
+
+  void SetAsyncID(uint64_t aID) { mAsyncID = aID; }
+
+  virtual bool Lock() { return false; }
+
+  virtual void Unlock() { }
+
+  virtual already_AddRefed<TexturedEffect> GenEffect(const gfx::SamplingFilter aSamplingFilter) {
+    return nullptr;
+  }
+
+  /// Called when shutting down the layer tree.
+  /// This is a good place to clear all potential gpu resources before the widget
+  /// is is destroyed.
+  virtual void CleanupResources() {}
+
+protected:
+  TextureInfo mTextureInfo;
+  uint64_t mAsyncID;
+  uint64_t mCompositorID;
+  RefPtr<Compositor> mCompositor;
+  Layer* mLayer;
+  uint32_t mFlashCounter; // used when the pref "layers.flash-borders" is true.
+  bool mAttached;
+  bool mKeepAttached;
+};
+
+class AutoLockCompositableHost final
+{
+public:
+  explicit AutoLockCompositableHost(CompositableHost* aHost)
+    : mHost(aHost)
+  {
+    mSucceeded = (mHost && mHost->Lock());
+  }
+
+  ~AutoLockCompositableHost()
+  {
+    if (mSucceeded && mHost) {
+      mHost->Unlock();
+    }
+  }
+
+  bool Failed() const { return !mSucceeded; }
+
+private:
+  RefPtr<CompositableHost> mHost;
+  bool mSucceeded;
+};
+
+/**
+ * Global CompositableMap, to use in the compositor thread only.
+ *
+ * PCompositable and PLayer can, in the case of async textures, be managed by
+ * different top level protocols. In this case they don't share the same
+ * communication channel and we can't send an OpAttachCompositable (PCompositable,
+ * PLayer) message.
+ *
+ * In order to attach a layer and the right compositable if the the compositable
+ * is async, we store references to the async compositables in a CompositableMap
+ * that is accessed only on the compositor thread. During a layer transaction we
+ * send the message OpAttachAsyncCompositable(ID, PLayer), and on the compositor
+ * side we lookup the ID in the map and attach the corresponding compositable to
+ * the layer.
+ *
+ * CompositableMap must be global because the image bridge doesn't have any
+ * reference to whatever we have created with PLayerTransaction. So, the only way to
+ * actually connect these two worlds is to have something global that they can
+ * both query (in the same  thread). The map is not allocated the map on the 
+ * stack to avoid the badness of static initialization.
+ *
+ * Also, we have a compositor/PLayerTransaction protocol/etc. per layer manager, and the
+ * ImageBridge is used by all the existing compositors that have a video, so
+ * there isn't an instance or "something" that lives outside the boudaries of a
+ * given layer manager on the compositor thread except the image bridge and the
+ * thread itself.
+ */
+namespace CompositableMap {
+  void Create();
+  void Destroy();
+  PCompositableParent* Get(uint64_t aID);
+  void Set(uint64_t aID, PCompositableParent* aParent);
+  void Erase(uint64_t aID);
+  void Clear();
+} // namespace CompositableMap
+
+
+} // namespace layers
+} // namespace mozilla
+
+#endif