compositor-worker: Introduce WebCompositorMutableState

cc/blink/web_compositor_mutable_state_impl_unittest.cc

Index: cc/blink/web_compositor_mutable_state_impl_unittest.cc
diff --git a/cc/blink/web_compositor_mutable_state_impl_unittest.cc b/cc/blink/web_compositor_mutable_state_impl_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..d2dc7df327e90119f709429e5d873d286429c9f0
--- /dev/null
+++ b/cc/blink/web_compositor_mutable_state_impl_unittest.cc
@@ -0,0 +1,172 @@
+// Copyright 2015 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/blink/web_compositor_mutable_state_impl.h"
+
+#include "cc/animation/layer_tree_mutation.h"
+#include "cc/blink/web_compositor_mutable_state_provider_impl.h"
+#include "cc/test/fake_impl_task_runner_provider.h"
+#include "cc/test/fake_layer_tree_host_impl.h"
+#include "cc/test/fake_output_surface.h"
+#include "cc/test/layer_tree_host_common_test.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 "testing/gtest/include/gtest/gtest.h"
+
+namespace cc_blink {
+namespace {
+
+using cc::FakeImplTaskRunnerProvider;
+using cc::FakeLayerTreeHostImpl;
+using cc::FakeOutputSurface;
+using cc::LayerImpl;
+using cc::LayerImplList;
+using cc::LayerTreeHostCommonTest;
+using cc::LayerTreeMutation;
+using cc::LayerTreeMutationMap;
+using cc::LayerTreeSettings;
+using cc::OutputSurface;
+using cc::TestTaskGraphRunner;
+using cc::TestSharedBitmapManager;
+
+using blink::WebCompositorMutableState;
+
+class WebCompositorMutableStateTest : public LayerTreeHostCommonTest {
+ public:
+  WebCompositorMutableStateTest()
+      : output_surface_(FakeOutputSurface::Create3d()) {
+    LayerTreeSettings settings;
+    settings.layer_transforms_should_scale_layer_contents = true;
+    settings.verify_property_trees = true;
+    host_impl_.reset(new FakeLayerTreeHostImpl(settings, &task_runner_provider_,
+                                               &shared_bitmap_manager_,
+                                               &task_graph_runner_));
+    host_impl_->SetVisible(true);
+    EXPECT_TRUE(host_impl_->InitializeRenderer(output_surface_.get()));
+  }
+
+  FakeLayerTreeHostImpl& host_impl() { return *host_impl_; }
+
+  LayerImpl* root_layer() { return host_impl_->active_tree()->root_layer(); }
+
+ private:
+  TestSharedBitmapManager shared_bitmap_manager_;
+  TestTaskGraphRunner task_graph_runner_;
+  FakeImplTaskRunnerProvider task_runner_provider_;
+  scoped_ptr<OutputSurface> output_surface_;
+  scoped_ptr<FakeLayerTreeHostImpl> host_impl_;
+};
+
+TEST_F(WebCompositorMutableStateTest, NoMutableState) {
+  // In this test, there are no layers with either an element id or mutable
+  // properties. We should not be able to get any mutable state.
+  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl().active_tree(), 42);
+
+  gfx::Transform identity_matrix;
+  gfx::Point3F transform_origin;
+  gfx::PointF position;
+  gfx::Size bounds(100, 100);
+  SetLayerPropertiesForTesting(root.get(), identity_matrix, transform_origin,
+                               position, bounds, true, false, true);
+  root->SetDrawsContent(true);
+
+  host_impl().SetViewportSize(root->bounds());
+  host_impl().active_tree()->SetRootLayer(std::move(root));
+  host_impl().UpdateNumChildrenAndDrawPropertiesForActiveTree();
+
+  LayerTreeMutationMap mutations;
+  WebCompositorMutableStateProviderImpl provider(host_impl().active_tree(),
+                                                 &mutations);
+  scoped_ptr<WebCompositorMutableState> state(provider.getMutableStateFor(42));
+  EXPECT_FALSE(state);
+}
+
+TEST_F(WebCompositorMutableStateTest, MutableStateNoMutableProperties) {
+  // In this test, there is a layer with an element id, but no mutable
+  // properties. This should behave just as if we'd had no element id.
+  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl().active_tree(), 42);
+
+  gfx::Transform identity_matrix;
+  gfx::Point3F transform_origin;
+  gfx::PointF position;
+  gfx::Size bounds(100, 100);
+  SetLayerPropertiesForTesting(root.get(), identity_matrix, transform_origin,
+                               position, bounds, true, false, true);
+  root->SetDrawsContent(true);
+  root->SetElementId(42);
+
+  host_impl().SetViewportSize(root->bounds());
+  host_impl().active_tree()->SetRootLayer(std::move(root));
+  host_impl().UpdateNumChildrenAndDrawPropertiesForActiveTree();
+
+  LayerTreeMutationMap mutations;
+  WebCompositorMutableStateProviderImpl provider(host_impl().active_tree(),
+                                                 &mutations);
+  scoped_ptr<WebCompositorMutableState> state(provider.getMutableStateFor(42));
+  EXPECT_FALSE(state);
+}
+
+TEST_F(WebCompositorMutableStateTest, 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.
+  scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl().active_tree(), 42);
+
+  gfx::Transform identity_matrix;
+  gfx::Point3F transform_origin;
+  gfx::PointF position;
+  gfx::Size bounds(100, 100);
+  SetLayerPropertiesForTesting(root.get(), identity_matrix, transform_origin,
+                               position, bounds, true, false, true);
+  root->SetDrawsContent(true);
+  root->SetElementId(42);
+  root->SetMutableProperties(
+      cc::kMutablePropertyOpacity | cc::kMutablePropertyTransform |
+      cc::kMutablePropertyScrollLeft | cc::kMutablePropertyScrollTop);
+
+  host_impl().SetViewportSize(root->bounds());
+  host_impl().active_tree()->SetRootLayer(std::move(root));
+  host_impl().UpdateNumChildrenAndDrawPropertiesForActiveTree();
+
+  LayerTreeMutationMap mutations;
+  WebCompositorMutableStateProviderImpl provider(host_impl().active_tree(),
+                                                 &mutations);
+
+  scoped_ptr<WebCompositorMutableState> state(provider.getMutableStateFor(42));
+  EXPECT_TRUE(state.get());
+
+  EXPECT_EQ(1.0, root_layer()->opacity());
+  EXPECT_EQ(identity_matrix.ToString(), root_layer()->transform().ToString());
+  EXPECT_EQ(0.0, root_layer()->CurrentScrollOffset().x());
+  EXPECT_EQ(0.0, root_layer()->CurrentScrollOffset().y());
+
+  gfx::Transform zero(0, 0, 0, 0, 0, 0);
+  state->setOpacity(0.5);
+  state->setTransform(zero.matrix());
+  state->setScrollLeft(1.0);
+  state->setScrollTop(1.0);
+
+  EXPECT_EQ(0.5, root_layer()->opacity());
+  EXPECT_EQ(zero.ToString(), root_layer()->transform().ToString());
+  EXPECT_EQ(1.0, root_layer()->CurrentScrollOffset().x());
+  EXPECT_EQ(1.0, root_layer()->CurrentScrollOffset().y());
+
+  // The corresponding mutation should reflect the changed values.
+  EXPECT_EQ(1ul, mutations.size());
+
+  const LayerTreeMutation& mutation = mutations[42];
+  EXPECT_TRUE(mutation.is_opacity_mutated());
+  EXPECT_TRUE(mutation.is_transform_mutated());
+  EXPECT_TRUE(mutation.is_scroll_left_mutated());
+  EXPECT_TRUE(mutation.is_scroll_top_mutated());
+
+  EXPECT_EQ(0.5, mutation.opacity());
+  EXPECT_EQ(zero.ToString(), gfx::Transform(mutation.transform()).ToString());
+  EXPECT_EQ(1.0, mutation.scroll_left());
+  EXPECT_EQ(1.0, mutation.scroll_top());
+}
+
+}  // namespace
+}  // namespace cc_blink