gpu: Implement idle async pixel transfers.

ui/gl/async_pixel_transfer_delegate_stub.h

Index: ui/gl/async_pixel_transfer_delegate_stub.h
diff --git a/ui/gl/async_pixel_transfer_delegate_stub.h b/ui/gl/async_pixel_transfer_delegate_stub.h
index cb21d8cbe824dc66ce819dbf7bfa386bc143cf67..277cfe0d03e56b821ffc75068b29c7ee736c83e1 100644
--- a/ui/gl/async_pixel_transfer_delegate_stub.h
+++ b/ui/gl/async_pixel_transfer_delegate_stub.h
@@ -5,29 +5,21 @@
 #ifndef UI_GL_ASYNC_TASK_DELEGATE_STUB_H_
 #define UI_GL_ASYNC_TASK_DELEGATE_STUB_H_
 
+#include <list>
+#include <queue>
+
+#include "base/callback.h"
 #include "ui/gl/async_pixel_transfer_delegate.h"
 
 namespace gfx {
+class GLSurface;
+class TransferStateInternalStub;
+class ScopedSafeSharedMemory;
 
-class AsyncTransferStateStub : public AsyncPixelTransferState {
- public:
-  // implement AsyncPixelTransferState:
-  virtual bool TransferIsInProgress() OVERRIDE;
-  virtual void BindTransfer(AsyncTexImage2DParams* bound_params) OVERRIDE;
-
- private:
-  friend class AsyncPixelTransferDelegateStub;
-  bool needs_late_bind_;
-  AsyncTexImage2DParams late_bind_define_params_ ;
-
-  explicit AsyncTransferStateStub(GLuint texture_id);
-  virtual ~AsyncTransferStateStub();
-  DISALLOW_COPY_AND_ASSIGN(AsyncTransferStateStub);
-};
-
-// Class which handles async pixel transfers (as a fallback).
-// This class just does the uploads synchronously.
-class AsyncPixelTransferDelegateStub : public AsyncPixelTransferDelegate {
+// Class which handles async pixel transfers in a platform
+// independent way.
+class AsyncPixelTransferDelegateStub : public AsyncPixelTransferDelegate,
+    public base::SupportsWeakPtr<AsyncPixelTransferDelegateStub> {
  public:
   static scoped_ptr<AsyncPixelTransferDelegate>
       Create(gfx::GLContext* context);
@@ -48,17 +40,48 @@ class AsyncPixelTransferDelegateStub : public AsyncPixelTransferDelegate {
       const AsyncTexSubImage2DParams& tex_params,
       const AsyncMemoryParams& mem_params) OVERRIDE;
   virtual void WaitForTransferCompletion(
-      AsyncPixelTransferState* state) OVERRIDE;
+      AsyncPixelTransferState* transfer_state) OVERRIDE;
   virtual uint32 GetTextureUploadCount() OVERRIDE;
   virtual base::TimeDelta GetTotalTextureUploadTime() OVERRIDE;
+  virtual void ProcessPendingTransfers() OVERRIDE;
+  virtual bool CanProcessPendingTransfers() OVERRIDE;
+
  private:
+  struct Transfer {
+    Transfer(TransferStateInternalStub* state, const base::Closure& task);
+    ~Transfer();
+
+    scoped_refptr<TransferStateInternalStub> state;
+    base::Closure task;
+    std::queue<base::Closure> notifications;
+  };
+
+  void ProcessTransfer(Transfer& transfer);
+
   // implement AsyncPixelTransferDelegate:
   virtual AsyncPixelTransferState*
       CreateRawPixelTransferState(GLuint texture_id) OVERRIDE;
 
+  void PerformNotifyCompletion(
+      AsyncMemoryParams mem_params,
+      ScopedSafeSharedMemory* safe_shared_memory,
+      const CompletionCallback& callback);
+  void PerformAsyncTexImage2D(
+      scoped_refptr<TransferStateInternalStub> state,
+      AsyncTexImage2DParams tex_params,
+      AsyncMemoryParams mem_params,
+      ScopedSafeSharedMemory* safe_shared_memory);
+  void PerformAsyncTexSubImage2D(
+      scoped_refptr<TransferStateInternalStub> state,
+      AsyncTexSubImage2DParams tex_params,
+      AsyncMemoryParams mem_params,
+      ScopedSafeSharedMemory* safe_shared_memory);
+
   int texture_upload_count_;
   base::TimeDelta total_texture_upload_time_;
 
+  std::list<Transfer> transfers_;
+
   DISALLOW_COPY_AND_ASSIGN(AsyncPixelTransferDelegateStub);
 };