[PPAPI] Compositor API implementation

ppapi/proxy/compositor_resource.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PPAPI_PROXY_COMPOSITOR_RESOURCE_H_
 #define PPAPI_PROXY_COMPOSITOR_RESOURCE_H_
 
 #include <map>
-#include <vector>
 
+#include "base/callback.h"
+#include "base/memory/scoped_vector.h"
+#include "base/memory/weak_ptr.h"
+#include "ppapi/c/ppb_compositor_layer.h"
 #include "ppapi/proxy/plugin_resource.h"
 #include "ppapi/proxy/ppapi_proxy_export.h"
+#include "ppapi/shared_impl/compositor_layer.h"
+#include "ppapi/shared_impl/scoped_pp_resource.h"
 #include "ppapi/thunk/ppb_compositor_api.h"
 
 namespace ppapi {
 namespace proxy {
 
 class PPAPI_PROXY_EXPORT CompositorResource
     : public PluginResource,
       public thunk::PPB_Compositor_API {
  public:
+  // Release callback for texture or image.
+  typedef base::Callback<void(uint32_t, bool)> ReleaseCallback;
+
+  class Layer : public base::SupportsWeakPtr<Layer> {

[raymes, 2014/06/02 03:51:08]

How come you don't just put this stuff in CompositorLayerResource? I think it's
more confusing to have an extra layer of indirection. The CompositorResource
could just hold a reference to the CompositorLayerResource

[Peng, 2014/06/02 19:01:55]

I think use a WeakPtr is more convenient for the implementation. We do not
invalid the CompositorLayerResource manually, and we do not need maintain the
ref of CompositorLayerResource in CompositorResource manually too.

I renamed it to LayerImpl, and wish it can be less confusing.

[raymes, 2014/06/03 00:43:22]

Could you explain a bit more about the difficulty? I was imagining that
CompositorResource would just hold a
vector<scoped_refptr<CompositorLayerResource> > rather than a
ScopedVector<Layer>. If you really needed a lot of direct access to members from
CompositorLayer you could make it a friend class (though it doesn't seem like
that is a big issue).

From my perspective this would be a simpler design.

[Peng, 2014/06/03 18:32:23]

The problem for me is how PP_Resource ref is maintained in pepper. So using
LayerImpl and WeakPtr, I don't need care about PP_Resource ref.

I went through the code of ResourceTracker, and understand the PP_Resource ref,
and Changed the implementation to remove LayerImpl.

Done

+   public:
+     Layer(CompositorResource* compositor);
+    ~Layer();
+
+    // Methods for CompositorLayerResource:
+    int32_t SetColor(uint8_t red,
+                     uint8_t green,
+                     uint8_t blue,
+                     uint8_t alpha,
+                     const struct PP_Size* size);
+    int32_t SetTexture(PP_Resource context,
+                       uint32_t texture,
+                       const struct PP_Size* size,
+                       const scoped_refptr<TrackedCallback>& release_callback);
+    int32_t SetImage(PP_Resource image_data,
+                     const struct PP_Size* size,
+                     const scoped_refptr<TrackedCallback>& release_callback);
+    int32_t SetClipRect(const struct PP_Rect* rect);
+    int32_t SetTransform(const float matrix[16]);
+    int32_t SetOpacity(uint8_t opacity);
+    int32_t SetBlendMode(PP_BlendMode mode);
+    int32_t SetSourceRect(const struct PP_FloatRect* rect);
+    int32_t SetPremultipliedAlpha(PP_Bool premult);
+
+    const CompositorLayer& data() const { return data_; }
+    const ReleaseCallback& release_callback() const {
+      return release_callback_;
+    }
+    void ResetReleaseCallback() { release_callback_.Reset(); }
+
+   private:
+    bool SetType(CompositorLayer::Type type);
+
+    void OnTextureReleased(
+        const ScopedPPResource& context,
+        uint32_t texture,
+        const scoped_refptr<TrackedCallback>& release_callback,
+        uint32_t sync_point,
+        bool is_lost);
+
+    void OnImageReleased(
+        const ScopedPPResource& image,
+        const scoped_refptr<TrackedCallback>& release_callback,
+        uint32_t sync_point,
+        bool is_lost);
+
+    CompositorResource* compositor_;
+
+    // Release callback for texture or image layer.
+    ReleaseCallback release_callback_;
+
+    PP_FloatSize source_size_;
+
+    CompositorLayer data_;
+
+    DISALLOW_COPY_AND_ASSIGN(Layer);
+  };
+
   CompositorResource(Connection connection,
                      PP_Instance instance);
 
  private:
   virtual ~CompositorResource();
 
+  bool IsInProgress() const {
+    return TrackedCallback::IsPending(commit_callback_);
+  }
+
+  int32_t GenerateResourceId() {
+    return ++last_resource_id_;
+  }
+
   // Resource overrides:
   virtual thunk::PPB_Compositor_API* AsPPB_Compositor_API() OVERRIDE;
 
+  // PluginResource overrides:
+  virtual void OnReplyReceived(const ResourceMessageReplyParams& params,
+                               const IPC::Message& msg) OVERRIDE;
+
   // thunk::PPB_Compositor_API overrides:
   virtual PP_Resource AddLayer() OVERRIDE;
   virtual int32_t CommitLayers(
-      const scoped_refptr<ppapi::TrackedCallback>& callback) OVERRIDE;
+      const scoped_refptr<TrackedCallback>& callback) OVERRIDE;
   virtual int32_t ResetLayers() OVERRIDE;
 
+  // IPC msg handlers:
+  void OnPluginMsgCommitLayersReply(const ResourceMessageReplyParams& params);
+  void OnPluginMsgReleaseResource(
+      const ResourceMessageReplyParams& params,
+      int32_t id,
+      uint32_t sync_point,
+      bool is_lost);
+
+  scoped_refptr<TrackedCallback> commit_callback_;
+
+  bool layer_changed_;
+
+  ScopedVector<Layer> layers_;
+
+  int32_t last_resource_id_;
+  typedef std::map<int32_t, ReleaseCallback > ReleaseCallbackMap;
+  ReleaseCallbackMap release_callback_map_;
+
   DISALLOW_COPY_AND_ASSIGN(CompositorResource);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_COMPOSITOR_RESOURCE_H_