Avoid exposing cc::Layer tree to CompositorProxy

third_party/WebKit/Source/platform/graphics/CompositorMutableStateTest.cpp

 // Copyright 2016 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 "platform/graphics/CompositorMutableState.h"
 
 #include "base/message_loop/message_loop.h"
-#include "cc/test/fake_compositor_frame_sink.h"
-#include "cc/test/fake_impl_task_runner_provider.h"
-#include "cc/test/fake_layer_tree_host_impl.h"
-#include "cc/test/test_shared_bitmap_manager.h"
-#include "cc/test/test_task_graph_runner.h"
-#include "cc/trees/layer_tree_host_impl.h"
-#include "cc/trees/layer_tree_impl.h"
-#include "platform/graphics/CompositorElementId.h"
 #include "platform/graphics/CompositorMutableProperties.h"
 #include "platform/graphics/CompositorMutableStateProvider.h"
 #include "platform/graphics/CompositorMutation.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include <memory>
 
 namespace blink {
 
-using cc::FakeImplTaskRunnerProvider;
-using cc::FakeLayerTreeHostImpl;
-using cc::FakeCompositorFrameSink;
-using cc::LayerImpl;
-using cc::LayerTreeSettings;
-using cc::TestTaskGraphRunner;
-using cc::TestSharedBitmapManager;
-
-class CompositorMutableStateTest : public testing::Test {
- public:
-  CompositorMutableStateTest()
-      : m_compositorFrameSink(FakeCompositorFrameSink::Create3d()) {
-    LayerTreeSettings settings;
-    settings.layer_transforms_should_scale_layer_contents = true;
-    m_hostImpl.reset(new FakeLayerTreeHostImpl(settings, &m_taskRunnerProvider,
-                                               &m_taskGraphRunner));
-    m_hostImpl->SetVisible(true);
-    EXPECT_TRUE(m_hostImpl->InitializeRenderer(m_compositorFrameSink.get()));
-  }
-
-  void SetLayerPropertiesForTesting(LayerImpl* layer) {
-    layer->test_properties()->transform = gfx::Transform();
-    layer->SetPosition(gfx::PointF());
-    layer->SetBounds(gfx::Size(100, 100));
-    layer->SetDrawsContent(true);
-  }
-
-  FakeLayerTreeHostImpl& hostImpl() { return *m_hostImpl; }
-
-  LayerImpl* rootLayer() {
-    return m_hostImpl->active_tree()->root_layer_for_testing();
-  }
-
- private:
-  // The cc testing machinery has fairly deep dependency on having a main
-  // message loop (one example is the task runner provider). We construct one
-  // here so that it's installed in TLA and can be found by other cc classes.
-  base::MessageLoop m_messageLoop;
-  TestTaskGraphRunner m_taskGraphRunner;
-  FakeImplTaskRunnerProvider m_taskRunnerProvider;
-  std::unique_ptr<FakeCompositorFrameSink> m_compositorFrameSink;
-  std::unique_ptr<FakeLayerTreeHostImpl> m_hostImpl;
-};
-
-TEST_F(CompositorMutableStateTest, NoMutableState) {
-  // In this test, there are no layers with either an element id or mutable
+TEST(CompositorMutableStateTest, NoMutableState) {
+  // In this test, there are no proxies with either an element id or mutable
   // properties. We should not be able to get any mutable state.
-  std::unique_ptr<LayerImpl> root =
-      LayerImpl::Create(hostImpl().active_tree(), 42);
-  SetLayerPropertiesForTesting(root.get());
-
-  hostImpl().SetViewportSize(root->bounds());
-  hostImpl().active_tree()->SetRootLayerForTesting(std::move(root));
-  hostImpl().UpdateNumChildrenAndDrawPropertiesForActiveTree();
-
+  ProxyCompositorMutablePropertiesMap emptyMap;
   CompositorMutations mutations;
-  CompositorMutableStateProvider provider(hostImpl().active_tree(), &mutations);
+  CompositorMutableStateProvider provider(&emptyMap, &mutations);
   std::unique_ptr<CompositorMutableState> state(
       provider.getMutableStateFor(42));
   EXPECT_FALSE(state);
 }
 
-TEST_F(CompositorMutableStateTest, MutableStateMutableProperties) {
-  // In this test, there is a layer with an element id and mutable properties.
-  // In this case, we should get a valid mutable state for this element id that
-  // has a real effect on the corresponding layer.
-  std::unique_ptr<LayerImpl> root =
-      LayerImpl::Create(hostImpl().active_tree(), 42);
+TEST(CompositorMutableStateTest, MutableStateMutableProperties) {
+  // In this test, there is a proxy with an element id and mutable properties.
+  // In this case, we should get a valid mutable state for this element id and
+  // mutations should be updated accordingly.
+  int proxyId = 12;
+  int elementId = 15;
 
-  std::unique_ptr<LayerImpl> scopedLayer =
-      LayerImpl::Create(hostImpl().active_tree(), 11);
-  LayerImpl* layer = scopedLayer.get();
-  layer->SetScrollClipLayer(root->id());
-
-  root->test_properties()->AddChild(std::move(scopedLayer));
-
-  SetLayerPropertiesForTesting(layer);
-
-  int primaryId = 12;
-  root->SetElementId(
-      createCompositorElementId(primaryId, CompositorSubElementId::Primary));
-  layer->SetElementId(
-      createCompositorElementId(primaryId, CompositorSubElementId::Scroll));
-
-  root->SetMutableProperties(CompositorMutableProperty::kOpacity |
-                             CompositorMutableProperty::kTransform);
-  layer->SetMutableProperties(CompositorMutableProperty::kScrollLeft |
-                              CompositorMutableProperty::kScrollTop);
-
-  hostImpl().SetViewportSize(layer->bounds());
-  hostImpl().active_tree()->SetRootLayerForTesting(std::move(root));
-  hostImpl().UpdateNumChildrenAndDrawPropertiesForActiveTree();
+  ProxyCompositorMutablePropertiesMap inputProperties;
+  inputProperties[proxyId].elementId = elementId;
+  inputProperties[proxyId].opacity = 1.0;
+  inputProperties[proxyId].transform = SkMatrix44::I();
+  inputProperties[proxyId].scrollLeft = 0;
+  inputProperties[proxyId].scrollTop = 0;
 
   CompositorMutations mutations;
-  CompositorMutableStateProvider provider(hostImpl().active_tree(), &mutations);
+  CompositorMutableStateProvider provider(&inputProperties, &mutations);
 
   std::unique_ptr<CompositorMutableState> state(
-      provider.getMutableStateFor(primaryId));
+      provider.getMutableStateFor(proxyId));
   EXPECT_TRUE(state.get());
 
-  EXPECT_EQ(1.0, rootLayer()->Opacity());
-  EXPECT_EQ(gfx::Transform().ToString(), rootLayer()->Transform().ToString());
-  EXPECT_EQ(0.0, layer->CurrentScrollOffset().x());
-  EXPECT_EQ(0.0, layer->CurrentScrollOffset().y());
+  EXPECT_EQ(1.0, state->opacity());
+  EXPECT_EQ(SkMatrix44::I(), state->transform());
+  EXPECT_EQ(0.0, state->scrollTop());
+  EXPECT_EQ(0.0, state->scrollLeft());
 
-  gfx::Transform zero(0, 0, 0, 0, 0, 0);
+  SkMatrix44 zero;
   state->setOpacity(0.5);
-  state->setTransform(zero.matrix());
-  state->setScrollLeft(1.0);
-  state->setScrollTop(1.0);
+  state->setTransform(zero);
+  state->setScrollLeft(0.75);
+  state->setScrollTop(0.25);
 
-  EXPECT_EQ(0.5, rootLayer()->Opacity());
-  EXPECT_EQ(zero.ToString(), rootLayer()->Transform().ToString());
-  EXPECT_EQ(1.0, layer->CurrentScrollOffset().x());
-  EXPECT_EQ(1.0, layer->CurrentScrollOffset().y());
+  EXPECT_EQ(0.5, state->opacity());
+  EXPECT_EQ(zero, state->transform());
+  EXPECT_EQ(0.25, state->scrollTop());
+  EXPECT_EQ(0.75, state->scrollLeft());
 
   // The corresponding mutation should reflect the changed values.
   EXPECT_EQ(1ul, mutations.map.size());
 
-  const CompositorMutation& mutation = *mutations.map.find(primaryId)->value;
+  const CompositorMutation& mutation = *mutations.map.find(elementId)->value;
   EXPECT_TRUE(mutation.isOpacityMutated());
   EXPECT_TRUE(mutation.isTransformMutated());
   EXPECT_TRUE(mutation.isScrollLeftMutated());
   EXPECT_TRUE(mutation.isScrollTopMutated());
 
   EXPECT_EQ(0.5, mutation.opacity());
-  EXPECT_EQ(zero.ToString(), gfx::Transform(mutation.transform()).ToString());
-  EXPECT_EQ(1.0, mutation.scrollLeft());
-  EXPECT_EQ(1.0, mutation.scrollTop());
+  EXPECT_EQ(zero, mutation.transform());
+  EXPECT_EQ(0.75, mutation.scrollLeft());
+  EXPECT_EQ(0.25, mutation.scrollTop());
 }
 
 }  // namespace blink