android_webview: changes to support Android GraphicBuffers

android_webview/browser/pixel_buffer_impl.cc

+// Copyright 2013 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 "android_webview/browser/pixel_buffer_impl.h"
+
+#include "android_webview/browser/pixel_buffer_factory_impl.h"
+#include "android_webview/common/pixel_buffer_factory_proxy.h"
+#include "android_webview/public/browser/draw_gl.h"
+#include "base/bind.h"
+#include "base/logging.h"
+#include "ui/gfx/size.h"
+#include "ui/gl/pixel_buffer.h"
+
+namespace android_webview {
+
+// Provides hardware rendering functions from the Android glue layer.
+AwDrawGLFunctionTable* g_gl_draw_functions = NULL;
+
+PixelBufferImpl::PixelBufferImpl(const gfx::Size& size)
+    : buffer_id_(g_gl_draw_functions->create_pixel_buffer(
+          size.width(), size.height())),
+      size_(size) {
+}
+
+PixelBufferImpl::~PixelBufferImpl() {
+  DCHECK(buffer_id_ != 0);
+  g_gl_draw_functions->release_pixel_buffer(buffer_id_);
+  buffer_id_ = 0;
+}
+
+void PixelBufferImpl::MapForWrite(void** vaddr) {
+  DCHECK(buffer_id_ != 0);
+  int err = g_gl_draw_functions->lock_for_write(buffer_id_, vaddr);
+  DCHECK(err == 0);
+}
+
+void PixelBufferImpl::Unmap() {
+  DCHECK(buffer_id_ != 0);
+  int err = g_gl_draw_functions->unlock(buffer_id_);
+  DCHECK(err == 0);
+}
+
+void* PixelBufferImpl::GetNativeBuffer() {
+  DCHECK(buffer_id_ != 0);
+  return g_gl_draw_functions->get_native_buffer(buffer_id_);
+}
+
+uint32 PixelBufferImpl::GetStride() {
+  DCHECK(buffer_id_ != 0);
+  return g_gl_draw_functions->get_stride(buffer_id_);
+}
+
+// static
+void PixelBufferImpl::SetAwDrawGLFunctionTable(
+    AwDrawGLFunctionTable* table) {
+  g_gl_draw_functions = table;
+  SetPixelBufferFactoryProxy(base::Bind(&CreatePixelBuffer));
+}
+
+}  // namespace android_webview