cc : Simplify layer skipping logic

cc/trees/layer_tree_host_common_unittest.cc

 // Copyright 2011 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/trees/layer_tree_host_common.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <set>
@@ skipping 1325 matching lines @@
   EXPECT_EQ(gfx::RectF(0, 0, 10, 10),
             parent->render_surface()->DrawableContentRect());
   EffectTree& effect_tree =
       parent->layer_tree_impl()->property_trees()->effect_tree;
   EffectNode* node = effect_tree.Node(render_surface1->effect_tree_index());
   EXPECT_TRUE(node->data.is_drawn);
 
   // When parent is transparent, the layer should not be drawn.
   parent->OnOpacityAnimated(0.f);
   render_surface1->OnOpacityAnimated(1.f);
+  render_surface1->set_visible_layer_rect(gfx::Rect());
   {
     LayerImplList render_surface_layer_list;
     parent->layer_tree_impl()->IncrementRenderSurfaceListIdForTesting();
     LayerTreeHostCommon::CalcDrawPropsImplInputsForTesting inputs(
         parent, parent->bounds(), &render_surface_layer_list,
         parent->layer_tree_impl()->current_render_surface_list_id());
     inputs.can_adjust_raster_scales = true;
     LayerTreeHostCommon::CalculateDrawProperties(&inputs);
   }
 
   node = effect_tree.Node(render_surface1->effect_tree_index());
   EXPECT_FALSE(node->data.is_drawn);
+  EXPECT_EQ(gfx::Rect(), render_surface1->visible_layer_rect());
 }
 
 TEST_F(LayerTreeHostCommonTest, RenderSurfaceListForFilter) {
   LayerImpl* root = root_layer();
   LayerImpl* parent = AddChild<LayerImpl>(root);
   LayerImpl* child1 = AddChild<LayerImpl>(parent);
   LayerImpl* child2 = AddChild<LayerImpl>(parent);
   child1->SetDrawsContent(true);
   child2->SetDrawsContent(true);
 
@@ skipping 4284 matching lines @@
       root_layer, root_layer->bounds(), &render_surface_layer_list,
       root_layer->layer_tree_impl()->current_render_surface_list_id());
   inputs.can_adjust_raster_scales = true;
   LayerTreeHostCommon::CalculateDrawProperties(&inputs);
 
   EXPECT_GT(root_layer->num_copy_requests_in_target_subtree(), 0);
   EXPECT_GT(copy_grand_parent_layer->num_copy_requests_in_target_subtree(), 0);
   EXPECT_GT(copy_parent_layer->num_copy_requests_in_target_subtree(), 0);
   EXPECT_GT(copy_layer->num_copy_requests_in_target_subtree(), 0);
 
-  // We should have four render surfaces, one for the root, one for the grand
-  // parent since it has opacity and two drawing descendants, one for the parent
-  // since it owns a surface, and one for the copy_layer.
-  ASSERT_EQ(4u, render_surface_layer_list.size());
+  // We should have two render surfaces, one for the root and one for the
+  // copy_layer.
+  ASSERT_EQ(2u, render_surface_layer_list.size());
   EXPECT_EQ(root_layer->id(), render_surface_layer_list.at(0)->id());
-  EXPECT_EQ(copy_grand_parent_layer->id(),
-            render_surface_layer_list.at(1)->id());
-  EXPECT_EQ(copy_parent_layer->id(), render_surface_layer_list.at(2)->id());
-  EXPECT_EQ(copy_layer->id(), render_surface_layer_list.at(3)->id());
+  EXPECT_EQ(copy_layer->id(), render_surface_layer_list.at(1)->id());
 
   // The root render surface should have 2 contributing layers.
   ASSERT_EQ(2u, root_layer->render_surface()->layer_list().size());
   EXPECT_EQ(root_layer->id(),
             root_layer->render_surface()->layer_list().at(0)->id());
-  EXPECT_EQ(copy_grand_parent_layer->id(),
+  EXPECT_EQ(copy_layer->id(),
             root_layer->render_surface()->layer_list().at(1)->id());
 
-  // Nothing actually draws into the copy parent, so only the copy_layer will
-  // appear in its list, since it needs to be drawn for the copy request.
-  ASSERT_EQ(1u, copy_parent_layer->render_surface()->layer_list().size());
-  EXPECT_EQ(copy_layer->id(),
-            copy_layer->render_surface()->layer_list().at(0)->id());
+  ASSERT_EQ(0u, copy_parent_layer->render_surface()->layer_list().size());
 
   // The copy_layer's render surface should have two contributing layers.
   ASSERT_EQ(2u, copy_layer->render_surface()->layer_list().size());
   EXPECT_EQ(copy_layer->id(),
             copy_layer->render_surface()->layer_list().at(0)->id());
   EXPECT_EQ(copy_child_layer->id(),
             copy_layer->render_surface()->layer_list().at(1)->id());
 
   // copy_grand_parent, copy_parent shouldn't be drawn because they are hidden,
   // but the copy_layer and copy_child should be drawn for the copy request.
@@ skipping 4304 matching lines @@
   EXPECT_EQ(scroll_child6.id, grand_child10->scroll_tree_index());
   EXPECT_EQ(scroll_root1.id, parent3->scroll_tree_index());
   EXPECT_EQ(scroll_child7.id, child8->scroll_tree_index());
   EXPECT_EQ(scroll_root1.id, parent4->scroll_tree_index());
   EXPECT_EQ(scroll_root1.id, child9->scroll_tree_index());
   EXPECT_EQ(scroll_root1.id, grand_child12->scroll_tree_index());
 }
 
 }  // namespace
 }  // namespace cc