ContentShell rendering support on Android.

content/browser/android/graphics_context.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 "content/public/browser/android/graphics_context.h"
+
+#include "base/memory/scoped_ptr.h"
+#include "content/browser/android/draw_delegate_impl.h"
+#include "content/browser/gpu/browser_gpu_channel_host_factory.h"
+#include "content/browser/gpu/gpu_surface_tracker.h"
+#include "content/common/gpu/client/gpu_channel_host.h"
+#include "content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h"
+#include "content/common/gpu/gpu_process_launch_causes.h"
+#include "ui/gfx/native_widget_types.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebGraphicsContext3D.h"
+
+#include <android/native_window_jni.h>
+
+using content::BrowserGpuChannelHostFactory;
+
+namespace {
+
+// GraphicsContext implementation using a gpu command buffer.
+class CmdBufferGraphicsContext : public content::GraphicsContext {
+ public:
+  CmdBufferGraphicsContext(WebGraphicsContext3DCommandBufferImpl* context,
+                           int surface_id,
+                           ANativeWindow* window,
+                           int texture_id1,
+                           int texture_id2)
+      : context_(context),
+        surface_id_(surface_id),
+        window_(window) {
+    texture_id_[0] = texture_id1;
+    texture_id_[1] = texture_id2;
+  }
+
+  virtual ~CmdBufferGraphicsContext() {
+    context_->makeContextCurrent();
+    context_->deleteTexture(texture_id_[0]);
+    context_->deleteTexture(texture_id_[1]);
+    context_->finish();
+    GpuSurfaceTracker* tracker = GpuSurfaceTracker::Get();
+    tracker->RemoveSurface(surface_id_);
+    ANativeWindow_release(window_);
+  }
+
+  virtual WebKit::WebGraphicsContext3D* GetContext3D() {
+    return context_.get();
+  }
+  virtual uint32 InsertSyncPoint() {
+    return context_->insertSyncPoint();
+  }
+ private:

[jam, 2012/07/31 22:46:15]

nit: blank line above

+  scoped_ptr<WebGraphicsContext3DCommandBufferImpl> context_;
+  int surface_id_;
+  ANativeWindow* window_;
+  int texture_id_[2];
+};
+
+}  // anonymous namespace
+
+namespace content {
+
+// static
+GraphicsContext* GraphicsContext::CreateForUI(
+    ANativeWindow* window) {
+  DCHECK(window);
+  GpuSurfaceTracker* tracker = GpuSurfaceTracker::Get();
+
+  ANativeWindow_acquire(window);
+  int surface_id = tracker->AddSurfaceForNativeWidget(window);
+
+  tracker->SetSurfaceHandle(
+      surface_id,
+      gfx::GLSurfaceHandle(gfx::kDummyPluginWindow, false));
+
+  WebKit::WebGraphicsContext3D::Attributes attrs;
+  attrs.shareResources = true;
+  GpuChannelHostFactory* factory = BrowserGpuChannelHostFactory::instance();
+  GURL url("chrome://gpu/GpuProcessTransportHelper::CreateContext");
+  base::WeakPtr<WebGraphicsContext3DSwapBuffersClient> swap_client;
+  scoped_ptr<WebGraphicsContext3DCommandBufferImpl> context(
+      new WebGraphicsContext3DCommandBufferImpl(
+          surface_id,
+          url,
+          factory,
+          swap_client));
+  if (!context->Initialize(
+      attrs,
+      false,
+      CAUSE_FOR_GPU_LAUNCH_WEBGRAPHICSCONTEXT3DCOMMANDBUFFERIMPL_INITIALIZE)) {
+    return NULL;
+  }
+
+  context->makeContextCurrent();
+
+  gfx::GLSurfaceHandle handle = gfx::GLSurfaceHandle(
+      gfx::kNullPluginWindow, true);
+  handle.parent_gpu_process_id = context->GetGPUProcessID();
+  handle.parent_client_id = context->GetChannelID();
+  handle.parent_context_id = context->GetContextID();
+  handle.parent_texture_id[0] = context->createTexture();
+  handle.parent_texture_id[1] = context->createTexture();
+  handle.sync_point = context->insertSyncPoint();
+
+  DrawDelegateImpl::GetInstance()->SetDrawSurface(handle);
+
+  return new CmdBufferGraphicsContext(
+      context.release(), surface_id, window,
+      handle.parent_texture_id[0],
+      handle.parent_texture_id[1]);
+}
+
+}  // namespace content