cc : Compute visible rects dynamically (1)

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 <memory>
@@ skipping 46 matching lines @@
 #include "ui/gfx/transform.h"
 
 namespace cc {
 namespace {
 
 class VerifyTreeCalcsLayerTreeSettings : public LayerTreeSettings {
  public:
   VerifyTreeCalcsLayerTreeSettings() {
     verify_transform_tree_calculations = true;
     verify_clip_tree_calculations = true;
+    verify_visible_rect_calculations = true;
   }
 };
 
 class LayerTreeHostCommonTestBase : public LayerTestCommon::LayerImplTest {
  public:
   LayerTreeHostCommonTestBase()
       : LayerTestCommon::LayerImplTest(VerifyTreeCalcsLayerTreeSettings()) {}
   explicit LayerTreeHostCommonTestBase(const LayerTreeSettings& settings)
       : LayerTestCommon::LayerImplTest(settings) {}
 
@@ skipping 38 matching lines @@
     // empty.
     DCHECK(!root_layer->bounds().IsEmpty());
     LayerTreeHostCommon::CalcDrawPropsMainInputsForTesting inputs(
         root_layer, device_viewport_size);
     inputs.device_scale_factor = device_scale_factor;
     inputs.page_scale_factor = page_scale_factor;
     inputs.page_scale_layer = page_scale_layer;
     LayerTreeHostCommon::CalculateDrawPropertiesForTesting(&inputs);
   }
 
-  void ExecuteCalculateDrawProperties(LayerImpl* root_layer,
-                                      float device_scale_factor,
-                                      float page_scale_factor,
-                                      LayerImpl* page_scale_layer) {
+  void ExecuteCalculateDrawProperties(
+      LayerImpl* root_layer,
+      float device_scale_factor,
+      float page_scale_factor,
+      LayerImpl* page_scale_layer,
+      bool skip_verify_visible_rect_calculations = false) {
     if (device_scale_factor !=
         root_layer->layer_tree_impl()->device_scale_factor())
       root_layer->layer_tree_impl()->property_trees()->needs_rebuild = true;
 
     root_layer->layer_tree_impl()->SetDeviceScaleFactor(device_scale_factor);
 
     EXPECT_TRUE(page_scale_layer || (page_scale_factor == 1.f));
 
     gfx::Size device_viewport_size =
         gfx::Size(root_layer->bounds().width() * device_scale_factor,
                   root_layer->bounds().height() * device_scale_factor);
 
     render_surface_layer_list_impl_.reset(new LayerImplList);
 
     // We are probably not testing what is intended if the root_layer bounds are
     // empty.
     DCHECK(!root_layer->bounds().IsEmpty());
     LayerTreeHostCommon::CalcDrawPropsImplInputsForTesting inputs(
         root_layer, device_viewport_size,
         render_surface_layer_list_impl_.get());
     inputs.device_scale_factor = device_scale_factor;
     inputs.page_scale_factor = page_scale_factor;
     inputs.page_scale_layer = page_scale_layer;
     inputs.can_adjust_raster_scales = true;
+    if (skip_verify_visible_rect_calculations)
+      inputs.verify_visible_rect_calculations = false;
 
     LayerTreeHostCommon::CalculateDrawPropertiesForTesting(&inputs);
   }
 
   template <class LayerType>
   void ExecuteCalculateDrawProperties(LayerType* root_layer) {
     LayerType* page_scale_application_layer = nullptr;
     ExecuteCalculateDrawProperties(root_layer, 1.f, 1.f,
                                    page_scale_application_layer);
   }
@@ skipping 60 matching lines @@
     gfx::Vector2dF elastic_overscroll =
         root_layer->layer_tree_impl()->elastic_overscroll()->Current(
             root_layer->layer_tree_impl()->IsActiveTree());
     float page_scale_factor = 1.f;
     float device_scale_factor = 1.f;
     gfx::Size device_viewport_size =
         gfx::Size(root_layer->bounds().width() * device_scale_factor,
                   root_layer->bounds().height() * device_scale_factor);
     update_layer_list_impl_.reset(new LayerImplList);
     root_layer->layer_tree_impl()->BuildLayerListForTesting();
+    bool verify_visible_rect_calculations = true;
     draw_property_utils::BuildPropertyTreesAndComputeVisibleRects(
         root_layer, page_scale_layer, inner_viewport_scroll_layer,
         outer_viewport_scroll_layer, overscroll_elasticity_layer,
         elastic_overscroll, page_scale_factor, device_scale_factor,
         gfx::Rect(device_viewport_size), gfx::Transform(),
-        can_render_to_separate_surface,
+        can_render_to_separate_surface, verify_visible_rect_calculations,
         root_layer->layer_tree_impl()->property_trees(),
         update_layer_list_impl_.get());
   }
 
   void ExecuteCalculateDrawPropertiesWithoutSeparateSurfaces(
       LayerImpl* root_layer) {
     gfx::Size device_viewport_size =
         gfx::Size(root_layer->bounds().width(), root_layer->bounds().height());
     render_surface_layer_list_impl_.reset(new LayerImplList);
 
@@ skipping 8561 matching lines @@
   significant_transform->SetBounds(gfx::Size(30, 30));
   layer_clips_subtree->SetBounds(gfx::Size(30, 30));
   layer_clips_subtree->SetMasksToBounds(true);
   layer_clips_subtree->test_properties()->force_render_surface = true;
   render_surface->test_properties()->transform = transform2;
   render_surface->SetBounds(gfx::Size(30, 30));
   render_surface->test_properties()->force_render_surface = true;
   test_layer->SetBounds(gfx::Size(30, 30));
   test_layer->SetDrawsContent(true);
 
-  ExecuteCalculateDrawProperties(root);
+  float device_scale_factor = 1.f;
+  float page_scale_factor = 1.f;
+  LayerImpl* page_scale_layer = nullptr;
+  // Visible rects computed by combining clips in target space and root space
+  // don't match because of rotation transforms. So, we skip
+  // verify_visible_rect_calculations.
+  bool skip_verify_visible_rect_calculations = true;
+  ExecuteCalculateDrawProperties(root, device_scale_factor, page_scale_factor,
+                                 page_scale_layer,
+                                 skip_verify_visible_rect_calculations);
 
   TransformTree& transform_tree =
       root->layer_tree_impl()->property_trees()->transform_tree;
   TransformNode* transform_node =
       transform_tree.Node(significant_transform->transform_tree_index());
   EXPECT_EQ(transform_node->owner_id, significant_transform->id());
 
   EXPECT_TRUE(root->has_render_surface());
   EXPECT_FALSE(significant_transform->has_render_surface());
   EXPECT_TRUE(layer_clips_subtree->has_render_surface());
   EXPECT_TRUE(render_surface->has_render_surface());
   EXPECT_FALSE(test_layer->has_render_surface());
 
   ClipTree& clip_tree = root->layer_tree_impl()->property_trees()->clip_tree;
   ClipNode* clip_node = clip_tree.Node(render_surface->clip_tree_index());
   EXPECT_FALSE(clip_node->applies_local_clip);
   EXPECT_EQ(gfx::Rect(20, 20), test_layer->visible_layer_rect());
+
+  // Also test the visible rects computed by combining clips in root space.
+  gfx::Rect visible_rect = draw_property_utils::ComputeLayerVisibleRectDynamic(
+      root->layer_tree_impl()->property_trees(), test_layer);
+  EXPECT_EQ(gfx::Rect(30, 20), visible_rect);
 }
 
 TEST_F(LayerTreeHostCommonTest, TransformOfParentClipNodeAncestorOfTarget) {
   // Ensure that when parent clip node's transform is an ancestor of current
   // clip node's target, clip is 'projected' from parent space to current
   // target space and visible rects are calculated correctly.
   LayerImpl* root = root_layer_for_testing();
   LayerImpl* clip_layer = AddChild<LayerImpl>(root);
   LayerImpl* target_layer = AddChild<LayerImpl>(clip_layer);
   LayerImpl* test_layer = AddChild<LayerImpl>(target_layer);
@@ skipping 990 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