Implement webview.captureVisibleRegion()

content/browser/frame_host/render_widget_host_view_child_frame.cc

 // Copyright 2014 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/frame_host/render_widget_host_view_child_frame.h"
 
 #include <algorithm>
 #include <utility>
 #include <vector>
 
 #include "build/build_config.h"
+#include "cc/output/copy_output_request.h"
+#include "cc/output/copy_output_result.h"
 #include "cc/surfaces/surface.h"
 #include "cc/surfaces/surface_factory.h"
 #include "cc/surfaces/surface_manager.h"
 #include "cc/surfaces/surface_sequence.h"
 #include "content/browser/accessibility/browser_accessibility_manager.h"
 #include "content/browser/browser_plugin/browser_plugin_guest.h"
 #include "content/browser/compositor/surface_utils.h"
 #include "content/browser/frame_host/cross_process_frame_connector.h"
 #include "content/browser/gpu/compositor_util.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
@@ skipping 397 matching lines @@
 void RenderWidgetHostViewChildFrame::StopSpeaking() {
 }
 
 bool RenderWidgetHostViewChildFrame::PostProcessEventForPluginIme(
       const NativeWebKeyboardEvent& event) {
   return false;
 }
 #endif  // defined(OS_MACOSX)
 
 void RenderWidgetHostViewChildFrame::CopyFromCompositingSurface(
-    const gfx::Rect& /* src_subrect */,
-    const gfx::Size& /* dst_size */,
+    const gfx::Rect& src_subrect,
+    const gfx::Size& output_size,
     const ReadbackRequestCallback& callback,
-    const SkColorType /* preferred_color_type */) {
-  callback.Run(SkBitmap(), READBACK_FAILED);
+    const SkColorType preferred_color_type) {
+  if (!surface_factory_ || surface_id_.is_null())
+    callback.Run(SkBitmap(), READBACK_FAILED);
+
+  scoped_ptr<cc::CopyOutputRequest> request =
+      cc::CopyOutputRequest::CreateRequest(
+          base::Bind(&CopyFromCompositingSurfaceHasResult, output_size,
+                     preferred_color_type, callback));
+  if (!src_subrect.IsEmpty())
+    request->set_area(src_subrect);
+
+  surface_factory_->RequestCopyOfSurface(surface_id_, std::move(request));
 }
 
 void RenderWidgetHostViewChildFrame::CopyFromCompositingSurfaceToVideoFrame(
     const gfx::Rect& src_subrect,
     const scoped_refptr<media::VideoFrame>& target,
     const base::Callback<void(const gfx::Rect&, bool)>& callback) {
   NOTIMPLEMENTED();
   callback.Run(gfx::Rect(), false);
 }
 
@@ skipping 53 matching lines @@
 #endif
 }
 
 void RenderWidgetHostViewChildFrame::ClearCompositorSurfaceIfNecessary() {
   if (surface_factory_ && !surface_id_.is_null())
     surface_factory_->Destroy(surface_id_);
   surface_id_ = cc::SurfaceId();
 }
 
 }  // namespace content