cc: Make visible rect computation aware of pixel-moving filters

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 33 matching lines @@
 #include "cc/trees/clip_node.h"
 #include "cc/trees/draw_property_utils.h"
 #include "cc/trees/effect_node.h"
 #include "cc/trees/layer_tree_impl.h"
 #include "cc/trees/property_tree_builder.h"
 #include "cc/trees/scroll_node.h"
 #include "cc/trees/single_thread_proxy.h"
 #include "cc/trees/task_runner_provider.h"
 #include "cc/trees/transform_node.h"
 #include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/skia/include/core/SkImageFilter.h"
 #include "third_party/skia/include/effects/SkOffsetImageFilter.h"
+#include "third_party/skia/include/effects/SkXfermodeImageFilter.h"
 #include "ui/gfx/geometry/quad_f.h"
 #include "ui/gfx/geometry/vector2d_conversions.h"
 #include "ui/gfx/transform.h"
 
 namespace cc {
 namespace {
 
 class VerifyTreeCalcsLayerTreeSettings : public LayerTreeSettings {
  public:
   VerifyTreeCalcsLayerTreeSettings() {
@@ skipping 3026 matching lines @@
   child->SetMasksToBounds(true);
   grand_child->test_properties()->transform = grand_child_scale_matrix;
   grand_child->SetBounds(gfx::Size(100, 100));
   grand_child->SetDrawsContent(true);
   ExecuteCalculateDrawProperties(root);
 
   // The visible rect is expanded to integer coordinates.
   EXPECT_EQ(gfx::Rect(41, 41), grand_child->visible_layer_rect());
 }
 
+TEST_F(LayerTreeHostCommonTest, VisibleRectWithClippingAndFilters) {
+  LayerImpl* root = root_layer_for_testing();
+  LayerImpl* clip = AddChild<LayerImpl>(root);
+  LayerImpl* filter = AddChild<LayerImpl>(clip);
+  LayerImpl* filter_child = AddChild<LayerImpl>(filter);
+
+  root->SetBounds(gfx::Size(100, 100));
+  clip->SetBounds(gfx::Size(10, 10));
+  filter->test_properties()->force_render_surface = true;
+  filter_child->SetBounds(gfx::Size(2000, 2000));
+  filter_child->SetPosition(gfx::PointF(-50, -50));
+  filter_child->SetDrawsContent(true);
+
+  clip->SetMasksToBounds(true);
+
+  ExecuteCalculateDrawProperties(root);
+  EXPECT_EQ(gfx::Rect(50, 50, 10, 10), filter_child->visible_layer_rect());
+  EXPECT_EQ(gfx::Rect(10, 10), filter->render_surface()->content_rect());
+
+  FilterOperations blur_filter;
+  blur_filter.Append(FilterOperation::CreateBlurFilter(4.0f));
+  filter->test_properties()->filters = blur_filter;
+  host_impl()->active_tree()->property_trees()->needs_rebuild = true;
+
+  ExecuteCalculateDrawProperties(root);
+
+  EXPECT_EQ(gfx::Rect(38, 38, 34, 34), filter_child->visible_layer_rect());
+  EXPECT_EQ(gfx::Rect(-12, -12, 34, 34),
+            filter->render_surface()->content_rect());
+
+  gfx::Transform vertical_flip;
+  vertical_flip.Scale(1, -1);
+  sk_sp<SkImageFilter> flip_filter = SkImageFilter::MakeMatrixFilter(
+      vertical_flip.matrix(), kLow_SkFilterQuality, nullptr);
+  FilterOperations reflection_filter;
+  reflection_filter.Append(
+      FilterOperation::CreateReferenceFilter(SkXfermodeImageFilter::Make(
+          SkBlendMode::kSrcOver, std::move(flip_filter))));
+  filter->test_properties()->filters = reflection_filter;
+  host_impl()->active_tree()->property_trees()->needs_rebuild = true;
+
+  ExecuteCalculateDrawProperties(root);
+
+  EXPECT_EQ(gfx::Rect(50, 40, 10, 20), filter_child->visible_layer_rect());
+  EXPECT_EQ(gfx::Rect(0, -10, 10, 20),
+            filter->render_surface()->content_rect());
+}
+
+TEST_F(LayerTreeHostCommonTest, VisibleRectWithScalingClippingAndFilters) {
+  LayerImpl* root = root_layer_for_testing();
+  LayerImpl* scale = AddChild<LayerImpl>(root);
+  LayerImpl* clip = AddChild<LayerImpl>(scale);
+  LayerImpl* filter = AddChild<LayerImpl>(clip);
+  LayerImpl* filter_child = AddChild<LayerImpl>(filter);
+
+  root->SetBounds(gfx::Size(100, 100));
+  clip->SetBounds(gfx::Size(10, 10));
+  filter->test_properties()->force_render_surface = true;
+  filter_child->SetBounds(gfx::Size(2000, 2000));
+  filter_child->SetPosition(gfx::PointF(-50, -50));
+  filter_child->SetDrawsContent(true);
+
+  clip->SetMasksToBounds(true);
+
+  gfx::Transform scale_transform;
+  scale_transform.Scale(3, 3);
+  scale->test_properties()->transform = scale_transform;
+
+  ExecuteCalculateDrawProperties(root);
+  EXPECT_EQ(gfx::Rect(50, 50, 10, 10), filter_child->visible_layer_rect());
+  EXPECT_EQ(gfx::Rect(30, 30), filter->render_surface()->content_rect());
+
+  FilterOperations blur_filter;
+  blur_filter.Append(FilterOperation::CreateBlurFilter(4.0f));
+  filter->test_properties()->filters = blur_filter;
+  host_impl()->active_tree()->property_trees()->needs_rebuild = true;
+
+  ExecuteCalculateDrawProperties(root);
+
+  EXPECT_EQ(gfx::Rect(38, 38, 34, 34), filter_child->visible_layer_rect());
+  EXPECT_EQ(gfx::Rect(-36, -36, 102, 102),
+            filter->render_surface()->content_rect());
+
+  gfx::Transform vertical_flip;
+  vertical_flip.Scale(1, -1);
+  sk_sp<SkImageFilter> flip_filter = SkImageFilter::MakeMatrixFilter(
+      vertical_flip.matrix(), kLow_SkFilterQuality, nullptr);
+  FilterOperations reflection_filter;
+  reflection_filter.Append(
+      FilterOperation::CreateReferenceFilter(SkXfermodeImageFilter::Make(
+          SkBlendMode::kSrcOver, std::move(flip_filter))));
+  filter->test_properties()->filters = reflection_filter;
+  host_impl()->active_tree()->property_trees()->needs_rebuild = true;
+
+  ExecuteCalculateDrawProperties(root);
+
+  EXPECT_EQ(gfx::Rect(50, 40, 10, 20), filter_child->visible_layer_rect());
+  EXPECT_EQ(gfx::Rect(0, -30, 30, 60),
+            filter->render_surface()->content_rect());
+}
+
 TEST_F(LayerTreeHostCommonTest,
        DrawableAndVisibleContentRectsForLayersInUnclippedRenderSurface) {
   LayerImpl* root = root_layer_for_testing();
   LayerImpl* render_surface = AddChildToRoot<LayerImpl>();
   LayerImpl* child1 = AddChild<LayerImpl>(render_surface);
   LayerImpl* child2 = AddChild<LayerImpl>(render_surface);
   LayerImpl* child3 = AddChild<LayerImpl>(render_surface);
 
   root->SetBounds(gfx::Size(100, 100));
   render_surface->SetBounds(gfx::Size(3, 4));
@@ skipping 7228 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