Implement scrolling in Pepper. This does simple scrolling of the backing stor...

webkit/glue/plugins/pepper_device_context_2d.cc

 // Copyright (c) 2010 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 "webkit/glue/plugins/pepper_device_context_2d.h"
 
 #include <iterator>
 
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/task.h"
+#include "gfx/blit.h"
 #include "gfx/point.h"
 #include "gfx/rect.h"
 #include "skia/ext/platform_canvas.h"
 #include "third_party/ppapi/c/pp_errors.h"
 #include "third_party/ppapi/c/pp_module.h"
 #include "third_party/ppapi/c/pp_rect.h"
 #include "third_party/ppapi/c/pp_resource.h"
 #include "third_party/ppapi/c/ppb_device_context_2d.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "webkit/glue/plugins/pepper_image_data.h"
@@ skipping 484 matching lines @@
 
   // We want to replace the contents of the bitmap rather than blend.
   SkPaint paint;
   paint.setXfermodeMode(SkXfermode::kSrc_Mode);
   backing_canvas->drawBitmapRect(*image->GetMappedBitmap(),
                                  &src_irect, dest_rect, &paint);
 }
 
 void DeviceContext2D::ExecuteScroll(const gfx::Rect& clip, int dx, int dy,
                                     gfx::Rect* invalidated_rect) {
-  // TODO(brettw): implement this.
+  gfx::ScrollCanvas(image_data_->mapped_canvas(),
+                    clip, gfx::Point(dx, dy));
+  *invalidated_rect = clip;
 }
 
 void DeviceContext2D::ExecuteReplaceContents(ImageData* image,
                                              gfx::Rect* invalidated_rect) {
   image_data_->Swap(image);
   *invalidated_rect = gfx::Rect(0, 0,
                                 image_data_->width(), image_data_->height());
 }
 
 void DeviceContext2D::ScheduleOffscreenCallback(
@@ skipping 17 matching lines @@
   data.Execute(PP_OK);
 }
 
 bool DeviceContext2D::HasPendingFlush() const {
   return !unpainted_flush_callback_.is_null() ||
          !painted_flush_callback_.is_null() ||
          offscreen_flush_pending_;
 }
 
 }  // namespace pepper