cc: Find a better prioritized rect when the viewport rect is huge.

cc/resources/picture_layer_tiling_set.cc

 // Copyright 2012 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/resources/picture_layer_tiling_set.h"
 
 #include <limits>
 
 namespace cc {
 
@@ skipping 261 matching lines @@
 
 PictureLayerTilingSet::CoverageIterator::operator bool() const {
   return current_tiling_ < static_cast<int>(set_->tilings_.size()) ||
       region_iter_.has_rect();
 }
 
 void PictureLayerTilingSet::UpdateTilePriorities(
     WhichTree tree,
     gfx::Size device_viewport,
     gfx::Rect viewport_in_content_space,
+    gfx::Rect visible_content_rect,
     gfx::Size last_layer_bounds,
     gfx::Size current_layer_bounds,
     float last_layer_contents_scale,
     float current_layer_contents_scale,
     const gfx::Transform& last_screen_transform,
     const gfx::Transform& current_screen_transform,
     int current_source_frame_number,
     double current_frame_time,
     bool store_screen_space_quads_on_tiles,
     size_t max_tiles_for_interest_area) {
   gfx::RectF viewport_in_layer_space = gfx::ScaleRect(
-    viewport_in_content_space,
-    1.f / current_layer_contents_scale,
-    1.f / current_layer_contents_scale);
+      viewport_in_content_space,
+      1.f / current_layer_contents_scale);
+  gfx::RectF visible_layer_rect = gfx::ScaleRect(
+      visible_content_rect,
+      1.f / current_layer_contents_scale);
 
   for (size_t i = 0; i < tilings_.size(); ++i) {
     tilings_[i]->UpdateTilePriorities(
         tree,
         device_viewport,
         viewport_in_layer_space,
+        visible_layer_rect,
         last_layer_bounds,
         current_layer_bounds,
         last_layer_contents_scale,
         current_layer_contents_scale,
         last_screen_transform,
         current_screen_transform,
         current_source_frame_number,
         current_frame_time,
         store_screen_space_quads_on_tiles,
         max_tiles_for_interest_area);
   }
 }
 
 void PictureLayerTilingSet::DidBecomeActive() {
   for (size_t i = 0; i < tilings_.size(); ++i)
     tilings_[i]->DidBecomeActive();
 }
 
 scoped_ptr<base::Value> PictureLayerTilingSet::AsValue() const {
   scoped_ptr<base::ListValue> state(new base::ListValue());
   for (size_t i = 0; i < tilings_.size(); ++i)
     state->Append(tilings_[i]->AsValue().release());
   return state.PassAs<base::Value>();
 }
 
 }  // namespace cc