Add ClipNode when Render Surface Inherits Clip

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 <algorithm>
 #include <set>
 
 #include "cc/animation/layer_animation_controller.h"
@@ skipping 8222 matching lines @@
   LayerTreeHostCommon::PreCalculateMetaInformationForTesting(root.get());
 
   EXPECT_FALSE(root->layer_or_descendant_is_drawn());
   EXPECT_FALSE(root->visited());
   EXPECT_FALSE(root->sorted_for_recursion());
   EXPECT_FALSE(child->layer_or_descendant_is_drawn());
   EXPECT_FALSE(child->visited());
   EXPECT_FALSE(child->sorted_for_recursion());
 }
 
+TEST_F(LayerTreeHostCommonTest, RenderSurfaceClipsSubtree) {
+  // Ensure that a Clip Node is added when a render surface applies clip.
+  LayerImpl* root = root_layer();
+  LayerImpl* significant_transform = AddChildToRoot<LayerImpl>();
+  LayerImpl* layer_clips_subtree = AddChild<LayerImpl>(significant_transform);
+  LayerImpl* render_surface = AddChild<LayerImpl>(layer_clips_subtree);
+  LayerImpl* test_layer = AddChild<LayerImpl>(render_surface);
+
+  const gfx::Transform identity_matrix;
+  // This transform should be a significant one so that a transform node is
+  // formed for it.
+  gfx::Transform transform1;
+  transform1.RotateAboutYAxis(45);
+  transform1.RotateAboutXAxis(30);
+  // This transform should be a 3d transform as we want the render surface
+  // to flatten the transform
+  gfx::Transform transform2;
+  transform2.Translate3d(10, 10, 10);
+
+  layer_clips_subtree->SetMasksToBounds(true);
+  test_layer->SetDrawsContent(true);
+
+  SetLayerPropertiesForTesting(root, identity_matrix, gfx::Point3F(),
+                               gfx::PointF(), gfx::Size(30, 30), true, false,
+                               true);
+  SetLayerPropertiesForTesting(significant_transform, transform1,
+                               gfx::Point3F(), gfx::PointF(), gfx::Size(30, 30),
+                               true, false, false);
+  SetLayerPropertiesForTesting(layer_clips_subtree, identity_matrix,
+                               gfx::Point3F(), gfx::PointF(), gfx::Size(30, 30),
+                               true, false, false);
+  SetLayerPropertiesForTesting(render_surface, transform2, gfx::Point3F(),
+                               gfx::PointF(), gfx::Size(30, 30), true, false,
+                               true);
+  SetLayerPropertiesForTesting(test_layer, identity_matrix, gfx::Point3F(),
+                               gfx::PointF(), gfx::Size(30, 30), true, false,
+                               false);
+
+  ExecuteCalculateDrawProperties(root);
+
+  TransformTree transform_tree =
+      root->layer_tree_impl()->property_trees()->transform_tree;
+  TransformNode* transform_node = transform_tree.Node(2);
+  EXPECT_EQ(transform_node->owner_id, significant_transform->id());
+
+  ClipTree clip_tree = root->layer_tree_impl()->property_trees()->clip_tree;
+  ClipNode* clip_node = clip_tree.Node(3);
+  EXPECT_EQ(clip_node->owner_id, render_surface->id());
+  EXPECT_TRUE(clip_node->data.inherit_parent_target_space_clip);
+  EXPECT_EQ(test_layer->visible_rect_from_property_trees().ToString(),
+            test_layer->visible_layer_rect().ToString());
+}
+
 }  // namespace
 }  // namespace cc