Implemented browser side software compositing.

content/browser/renderer_host/software_output_device_win.cc

+// Copyright (c) 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 "content/browser/renderer_host/software_output_device.h"
+
+#include "base/command_line.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "third_party/skia/include/core/SkDevice.h"
+#include "ui/compositor/compositor.h"
+#include "ui/compositor/compositor_switches.h"
+#include "ui/gfx/gdi_util.h"
+
+namespace content {
+
+SoftwareOutputDevice::SoftwareOutputDevice(ui::Compositor* compositor)
+    : compositor_(compositor) {
+  // TODO Remove this when crbug.com/180702 is fixed
+  CHECK(!CommandLine::ForCurrentProcess()->HasSwitch(
+        switches::kUIEnableThreadedCompositing));
+  hdc_ = ::GetWindowDC(compositor->widget());
+}
+
+SoftwareOutputDevice::~SoftwareOutputDevice() {
+  ::ReleaseDC(compositor_->widget(), hdc_);
+}
+
+void SoftwareOutputDevice::Resize(const gfx::Size& viewport_size) {
+  cc::SoftwareOutputDevice::Resize(viewport_size);
+  gfx::CreateBitmapHeader(viewport_size_.width(),
+                          viewport_size_.height(), &bitmap_header_);
+}
+
+void SoftwareOutputDevice::EndPaint(cc::SoftwareFrameData* frame_data) {
+  DCHECK(device_);
+  DCHECK(frame_data == NULL);
+
+  if (!device_)
+    return;
+
+  gfx::Rect rect = damage_rect_;
+  rect.Intersect(gfx::Rect(viewport_size_));
+  if (rect.IsEmpty())
+    return;
+
+  const SkBitmap& bitmap = device_->accessBitmap(false);
+  gfx::StretchDIBits(hdc_,
+                     rect.x(), rect.y(),
+                     rect.width(), rect.height(),
+                     rect.x(), rect.y(),
+                     rect.width(), rect.height(),
+                     bitmap.getPixels(),
+                     reinterpret_cast<BITMAPINFO*>(&bitmap_header_));
+}
+
+}  // namespace content