[CLOSED] In-browser software compositing

cc/software_output_device_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 "cc/software_output_device_impl.h"
+
+#include "base/logging.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/core/SkDevice.h"
+
+namespace cc {
+
+SoftwareOutputDeviceImpl::SoftwareOutputDeviceImpl() {}
+
+SoftwareOutputDeviceImpl::~SoftwareOutputDeviceImpl() {}
+
+SkCanvas* SoftwareOutputDeviceImpl::BeginPaint() {
+  DCHECK(device_);
+  return canvas_.get();
+}
+
+void SoftwareOutputDeviceImpl::EndPaint(const gfx::Rect& damage_rect) {
+  DCHECK(device_);
+}
+
+void SoftwareOutputDeviceImpl::Resize(const gfx::Size& viewport_size) {
+  if (viewport_size_ == viewport_size)
+    return;
+
+  viewport_size_ = viewport_size;
+  device_ = skia::AdoptRef(new SkDevice(SkBitmap::kARGB_8888_Config,
+      viewport_size.width(), viewport_size.height(), true));
+  canvas_ = skia::AdoptRef(new SkCanvas(device_.get()));
+}
+
+void SoftwareOutputDeviceImpl::CopyToBitmap(
+    const gfx::Rect& rect, SkBitmap* output) {
+  DCHECK(device_);
+  SkIRect invertRect = SkIRect::MakeXYWH(
+      rect.x(), viewport_size_.height() - rect.bottom(),
+      rect.width(), rect.height());
+  const SkBitmap& bitmap = device_->accessBitmap(false);
+  bitmap.extractSubset(output, invertRect);
+}
+
+void SoftwareOutputDeviceImpl::Scroll(
+    const gfx::Vector2d& delta, const gfx::Rect& clip_rect) {
+  NOTIMPLEMENTED();
+}
+
+}  // namespace cc