Fix optimized pepper painting

webkit/glue/plugins/pepper_plugin_instance.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_plugin_instance.h"
 
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #if defined(OS_MACOSX)
 #include "base/mac_util.h"
@@ skipping 564 matching lines @@
   if (!bound_graphics_2d_ || !bound_graphics_2d_->is_always_opaque())
     return false;
 
   // We specifically want to compare against the area covered by the backing
   // store when seeing if we cover the given paint bounds, since the backing
   // store could be smaller than the declared plugin area.
   ImageData* image_data = bound_graphics_2d_->image_data();
   gfx::Rect plugin_backing_store_rect(position_.origin(),
                                       gfx::Size(image_data->width(),
                                                 image_data->height()));
-  gfx::Rect plugin_paint_rect = plugin_backing_store_rect.Intersect(clip_);
+  gfx::Rect clip_page(clip_);
+  clip_page.Offset(position_.origin());
+  gfx::Rect plugin_paint_rect = plugin_backing_store_rect.Intersect(clip_page);
   if (!plugin_paint_rect.Contains(paint_bounds))
     return false;
 
   *dib = image_data->platform_image()->GetTransportDIB();
   *location = plugin_backing_store_rect;
-  *clip = clip_;
+  *clip = clip_page;
   return true;
 }
 
 string16 PluginInstance::GetSelectedText(bool html) {
   if (!LoadSelectionInterface())
     return string16();
 
   PP_Var rv = plugin_selection_interface_->GetSelectedText(pp_instance(), html);
   scoped_refptr<StringVar> string(StringVar::FromPPVar(rv));
   Var::PluginReleasePPVar(rv);  // Release the ref the plugin transfered to us.
@@ skipping 482 matching lines @@
   bounds.size.width = dest_rect.width();
   bounds.size.height = dest_rect.height();
 
   CGContextDrawImage(canvas, bounds, image);
   CGContextRestoreGState(canvas);
 }
 #endif  // defined(OS_MACOSX)
 
 
 }  // namespace pepper