gpu: Add async pixel transfer interface, stub and tests.

ui/gl/async_pixel_transfer_delegate.h

+// Copyright (c) 2011 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 UI_GL_ASYNC_TASK_DELEGATE_H_
+#define UI_GL_ASYNC_TASK_DELEGATE_H_
+
+#include "base/basictypes.h"
+#include "base/bind.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "build/build_config.h"
+#include "ui/gl/gl_bindings.h"
+#include "ui/gl/gl_export.h"
+
+namespace base {
+class SharedMemory;
+}
+
+namespace gfx {
+
+struct AsyncTexImage2DParams {
+  GLenum target;
+  GLint level;
+  GLenum internal_format;
+  GLsizei width;
+  GLsizei height;
+  GLint border;
+  GLenum format;
+  GLenum type;
+};
+
+struct AsyncTexSubImage2DParams {
+  GLenum target;
+  GLint level;
+  GLint xoffset;
+  GLint yoffset;
+  GLsizei width;
+  GLsizei height;
+  GLenum format;
+  GLenum type;
+};
+
+struct AsyncMemoryParams {
+  base::SharedMemory* shared_memory;
+  uint32 shm_size;
+  uint32 shm_data_offset;
+  uint32 shm_data_size;
+};
+
+// AsyncPixelTransferState holds the resources required to do async
+// transfers on one texture. It should stay alive for the lifetime
+// of the texture to allow multiple transfers.
+class GL_EXPORT AsyncPixelTransferState
+    : public base::RefCounted<AsyncPixelTransferState> {
+ public:
+  // Returns true if there is a transfer in progress.
+  virtual bool TransferIsInProgress() = 0;
+
+  // Perform any custom binding of the transfer, if needed. If true is
+  // returned, level_params is set to the params used to define the texture
+  // (via AsyncTexImage2D), and the level is now defined with those params
+  // and contains fully valid data.
+  virtual bool BindTransfer(
+      GLenum target, AsyncTexImage2DParams* level_params) = 0;
+
+ protected:
+  friend class base::RefCounted<AsyncPixelTransferState>;
+  AsyncPixelTransferState() {}
+  virtual ~AsyncPixelTransferState() {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(AsyncPixelTransferState);
+};
+
+class GL_EXPORT AsyncPixelTransferDelegate {
+ public:
+  static scoped_ptr<AsyncPixelTransferDelegate>
+      Create(gfx::GLContext* context);
+  virtual ~AsyncPixelTransferDelegate() {}
+
+  virtual scoped_refptr<AsyncPixelTransferState>
+      CreatePixelTransferState(GLuint texture) = 0;
+
+  virtual void AsyncNotifyCompletion(
+      const base::Closure& notify_task) = 0;
+
+  virtual void AsyncTexImage2D(
+      AsyncPixelTransferState* state,
+      const AsyncTexImage2DParams& tex_params,
+      const AsyncMemoryParams& mem_params) = 0;
+
+  virtual void AsyncTexSubImage2D(
+      AsyncPixelTransferState* state,
+      const AsyncTexSubImage2DParams& tex_params,
+      const AsyncMemoryParams& mem_params) = 0;
+
+ protected:
+  AsyncPixelTransferDelegate() {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(AsyncPixelTransferDelegate);
+};
+
+}  // namespace gfx
+
+#endif  // UI_GL_ASYNC_TASK_DELEGATE_H_
+