cc : Compute visible rects dynamically (2)

cc/trees/layer_tree_impl_unittest.cc

 // Copyright 2014 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_impl.h"
 
 #include "base/macros.h"
 #include "cc/animation/mutable_properties.h"
 #include "cc/layers/heads_up_display_layer_impl.h"
 #include "cc/test/fake_layer_tree_host_impl.h"
@@ skipping 226 matching lines @@
   uninvertible_transform.matrix().set(2, 2, 0.0);
   uninvertible_transform.matrix().set(3, 3, 0.0);
   ASSERT_FALSE(uninvertible_transform.IsInvertible());
 
   LayerImpl* root = root_layer();
   root->test_properties()->transform = uninvertible_transform;
   root->SetBounds(gfx::Size(100, 100));
   root->SetDrawsContent(true);
 
   host_impl().SetViewportSize(root->bounds());
-  host_impl().UpdateNumChildrenAndDrawPropertiesForActiveTree();
+  // While computing visible rects by combining clips in screen space, we set
+  // the entire layer as visible if the screen space transform is singular. This
+  // is not always true when we combine clips in target space because if the
+  // intersection of combined_clip in taret space with layer_rect projected to
+  // target space is empty, we set it to an empty rect.
+  bool skip_verify_visible_rect_calculations = true;
+  host_impl().UpdateNumChildrenAndDrawPropertiesForActiveTree(
+      skip_verify_visible_rect_calculations);
   // Sanity check the scenario we just created.
   ASSERT_EQ(1u, RenderSurfaceLayerList().size());
   ASSERT_EQ(1u, root_layer()->render_surface()->layer_list().size());
   ASSERT_FALSE(root_layer()->ScreenSpaceTransform().IsInvertible());
 
   // Hit testing any point should not hit the layer. If the invertible matrix is
   // accidentally ignored and treated like an identity, then the hit testing
   // will incorrectly hit the layer when it shouldn't.
   gfx::PointF test_point(1.f, 1.f);
   LayerImpl* result_layer =
@@ skipping 1068 matching lines @@
 
   Region touch_handler_region(gfx::Rect(10, 10, 50, 50));
 
   LayerImpl* root = root_layer();
   root->test_properties()->transform = uninvertible_transform;
   root->SetBounds(gfx::Size(100, 100));
   root->SetDrawsContent(true);
   root->SetTouchEventHandlerRegion(touch_handler_region);
 
   host_impl().SetViewportSize(root->bounds());
-  host_impl().UpdateNumChildrenAndDrawPropertiesForActiveTree();
+  // While computing visible rects by combining clips in screen space, we set
+  // the entire layer as visible if the screen space transform is singular. This
+  // is not always true when we combine clips in target space because if the
+  // intersection of combined_clip in taret space with layer_rect projected to
+  // target space is empty, we set it to an empty rect.
+  bool skip_verify_visible_rect_calculations = true;
+  host_impl().UpdateNumChildrenAndDrawPropertiesForActiveTree(
+      skip_verify_visible_rect_calculations);
 
   // Sanity check the scenario we just created.
   ASSERT_EQ(1u, RenderSurfaceLayerList().size());
   ASSERT_EQ(1u, root->render_surface()->layer_list().size());
   ASSERT_FALSE(root->ScreenSpaceTransform().IsInvertible());
 
   // Hit checking any point should not hit the touch handler region on the
   // layer. If the invertible matrix is accidentally ignored and treated like an
   // identity, then the hit testing will incorrectly hit the layer when it
   // shouldn't.
@@ skipping 1043 matching lines @@
     auto weak_promise = promise->AsWeakPtr();
     host_impl().active_tree()->QueueSwapPromise(std::move(promise));
     host_impl().active_tree()->BreakSwapPromises(
         SwapPromise::DidNotSwapReason::SWAP_FAILS);
     EXPECT_FALSE(weak_promise);
   }
 }
 
 }  // namespace
 }  // namespace cc