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

ui/gl/async_pixel_transfer_delegate_stub.cc

+// Copyright (c) 2012 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.
+
+#include "ui/gl/async_pixel_transfer_delegate_stub.h"
+
+#include "base/bind.h"
+#include "base/lazy_instance.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/shared_memory.h"
+#include "build/build_config.h"
+#include "third_party/angle/include/EGL/egl.h"
+#include "third_party/angle/include/EGL/eglext.h"
+#include "ui/gl/async_pixel_transfer_delegate.h"
+#include "ui/gl/gl_bindings.h"
+
+using base::SharedMemory;
+using base::SharedMemoryHandle;
+
+// Gets the address of the data from shared memory.
+void* GetAddress(SharedMemory* shared_memory,

[greggman, 2012/12/12 03:51:36]

style: this wants to be in an anonymous namespace (preferred) or declare it
static

[epennerAtGoogle, 2012/12/12 04:49:49]

Done.

+                 uint32 shm_size,
+                 uint32 shm_data_offset,
+                 uint32 shm_data_size) {
+  // Memory bounds have already been validated, so there
+  // is just DCHECKS here.
+  DCHECK(shared_memory);
+  DCHECK(shared_memory->memory());
+  DCHECK_LE(shm_data_offset + shm_data_size, shm_size);
+  return static_cast<int8*>(shared_memory->memory()) + shm_data_offset;
+}
+
+namespace gfx {
+
+class AsyncTransferStateStub : public AsyncPixelTransferState {
+ public:
+  explicit AsyncTransferStateStub(GLuint texture_id) {}
+  // implement AsyncPixelTransferState:
+  virtual bool TransferIsInProgress() { return false; }
+  virtual bool BindAsyncTransferToTexture(GLenum target) { return true; }
+
+ private:
+  virtual ~AsyncTransferStateStub() {}
+  DISALLOW_COPY_AND_ASSIGN(AsyncTransferStateStub);
+};
+
+// Class which handles async pixel transfers on Android (using
+// EGLImageKHR and another upload thread)
+class AsyncPixelTransferDelegateStub : public AsyncPixelTransferDelegate {
+ public:
+  AsyncPixelTransferDelegateStub() {}
+  virtual ~AsyncPixelTransferDelegateStub() {}
+
+  // implement AsyncPixelTransferDelegate:
+  virtual scoped_refptr<AsyncPixelTransferState>
+      CreatePixelTransferState(GLuint texture_id) OVERRIDE {
+    return make_scoped_refptr(
+        static_cast<AsyncPixelTransferState*>(
+            new AsyncTransferStateStub(texture_id)));
+  }
+
+  virtual void AsyncNotifyCompletion(
+      const base::Closure& task) OVERRIDE {
+    task.Run();
+  }
+
+  virtual void AsyncTexImage2D(
+      AsyncPixelTransferState*,
+      AsyncTexImage2DParams t,

[greggman, 2012/12/12 03:51:36]

style: single letter names are discouraged in the style guide.

[epennerAtGoogle, 2012/12/12 04:49:49]

Done.

+      AsyncMemoryParams m) {
+    void* data = GetAddress(m.shared_memory, m.shm_size,
+                            m.shm_data_offset, m.shm_data_size);
+    glTexImage2D(

[greggman, 2012/12/12 03:51:36]

I'm a little confused. This is temporary impl that uploaded immediately right?

[epennerAtGoogle, 2012/12/12 04:49:49]

Yes this is a stub that allows the API to work by just doing synchronous calls.
We could remove this and just not support the extension instead, but we would
rather use the same code in the compositor, at least for now.

+      t.target, t.level, t.internal_format,
+      t.width, t.height, t.border, t.format, t.type, data);
+  }
+
+  virtual void AsyncTexSubImage2D(
+      AsyncPixelTransferState*,
+      AsyncTexSubImage2DParams t,
+      AsyncMemoryParams m)  {
+    void* data = GetAddress(m.shared_memory, m.shm_size,
+                            m.shm_data_offset, m.shm_data_size);
+    glTexSubImage2D(
+        t.target, t.level, t.xoffset, t.yoffset,
+        t.width, t.height, t.format, t.type, data);
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(AsyncPixelTransferDelegateStub);
+};
+
+scoped_ptr<AsyncPixelTransferDelegate> AsyncPixelTransferDelegate::Create() {
+  return make_scoped_ptr(
+      static_cast<AsyncPixelTransferDelegate*>(
+          new AsyncPixelTransferDelegateStub()));
+}
+
+}  // namespace gfx
+