Make ThumbnailGenerator::AskForSnapshot support high DPI.

content/renderer/render_widget.cc

Index: content/renderer/render_widget.cc
diff --git a/content/renderer/render_widget.cc b/content/renderer/render_widget.cc
index 43543df6224229ca3f9aa340d8e2718ba5f6a11d..418774d459af9e7442f41ce7a940605f40e2d4d5 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -1440,10 +1440,12 @@ void RenderWidget::OnMsgPaintAtSize(const TransportDIB::Handle& dib_handle,
   scoped_ptr<TransportDIB> paint_at_size_buffer(
       TransportDIB::CreateWithHandle(dib_handle));
 
-  gfx::Size canvas_size = page_size;
-  float x_scale = static_cast<float>(desired_size.width()) /
+  gfx::Size page_pixel_size = page_size.Scale(device_scale_factor_);
+  gfx::Size desired_pixel_size = desired_size.Scale(device_scale_factor_);

[oshima, 2012/08/07 03:22:21]

same here.

[mazda, 2012/08/07 03:55:50]

Done.

+  gfx::Size canvas_size = page_pixel_size;
+  float x_scale = static_cast<float>(desired_pixel_size.width()) /
                   static_cast<float>(canvas_size.width());
-  float y_scale = static_cast<float>(desired_size.height()) /
+  float y_scale = static_cast<float>(desired_pixel_size.height()) /
                   static_cast<float>(canvas_size.height());
 
   gfx::Rect orig_bounds(canvas_size);