Keeping track of descendants that draw content instead of recalcualting

cc/layers/delegated_renderer_layer_unittest.cc

Index: cc/layers/delegated_renderer_layer_unittest.cc
diff --git a/cc/layers/delegated_renderer_layer_unittest.cc b/cc/layers/delegated_renderer_layer_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..d3680cb95e1e22a7f7d1d61238a392ed70bcd144
--- /dev/null
+++ b/cc/layers/delegated_renderer_layer_unittest.cc
@@ -0,0 +1,78 @@
+// Copyright 2012 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/layers/delegated_renderer_layer.h"
+
+#include "cc/layers/delegated_frame_provider.h"
+#include "cc/layers/delegated_frame_resource_collection.h"
+#include "cc/layers/solid_color_layer.h"
+#include "cc/output/delegated_frame_data.h"
+#include "cc/test/fake_delegated_renderer_layer.h"
+#include "cc/test/fake_layer_tree_host.h"
+#include "cc/test/fake_proxy.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace cc {
+namespace {
+
+class DelegatedRendererLayerTest : public testing::Test {
+ public:
+  DelegatedRendererLayerTest() : proxy_() {
+    LayerTreeSettings settings;
+    settings.minimum_occlusion_tracking_size = gfx::Size();
+
+    host_impl_ = FakeLayerTreeHost::Create(settings);
+    host_impl_->SetViewportSize(gfx::Size(10, 10));
+  }
+
+ protected:
+  FakeProxy proxy_;
+  TestSharedBitmapManager shared_bitmap_manager_;
+  scoped_ptr<LayerTreeHost> host_impl_;
+};
+
+class DelegatedRendererLayerTestSimple : public DelegatedRendererLayerTest {
+ public:
+  DelegatedRendererLayerTestSimple() : DelegatedRendererLayerTest() {
+    scoped_ptr<RenderPass> root_pass(RenderPass::Create());
+    root_pass->SetNew(RenderPass::Id(1, 1),
+                      gfx::Rect(1, 1),
+                      gfx::Rect(1, 1),
+                      gfx::Transform());
+    scoped_ptr<DelegatedFrameData> frame_data(new DelegatedFrameData);
+    frame_data->render_pass_list.push_back(root_pass.Pass());
+    resources_ = new DelegatedFrameResourceCollection;
+    provider_ = new DelegatedFrameProvider(resources_, frame_data.Pass());
+    root_layer_ = SolidColorLayer::Create();
+    layer_before_ = SolidColorLayer::Create();
+    delegated_renderer_layer_ = FakeDelegatedRendererLayer::Create(provider_);
+  }
+
+ protected:
+  scoped_refptr<Layer> root_layer_;
+  scoped_refptr<Layer> layer_before_;
+  scoped_refptr<DelegatedRendererLayer> delegated_renderer_layer_;
+  scoped_refptr<DelegatedFrameResourceCollection> resources_;
+  scoped_refptr<DelegatedFrameProvider> provider_;
+};
+
+TEST_F(DelegatedRendererLayerTestSimple, DelegatedManyDescendants) {
+  EXPECT_EQ(0, root_layer_->NumDescendantsThatDrawContent());
+  root_layer_->AddChild(layer_before_);
+  EXPECT_EQ(0, root_layer_->NumDescendantsThatDrawContent());
+  layer_before_->SetIsDrawable(true);
+  EXPECT_EQ(1, root_layer_->NumDescendantsThatDrawContent());
+  EXPECT_EQ(0, layer_before_->NumDescendantsThatDrawContent());
+  layer_before_->AddChild(delegated_renderer_layer_);
+  EXPECT_EQ(0, layer_before_->NumDescendantsThatDrawContent());
+  EXPECT_EQ(0, delegated_renderer_layer_->NumDescendantsThatDrawContent());
+  EXPECT_EQ(1, root_layer_->NumDescendantsThatDrawContent());
+  delegated_renderer_layer_->SetIsDrawable(true);
+  EXPECT_EQ(1000, delegated_renderer_layer_->NumDescendantsThatDrawContent());
+  EXPECT_EQ(1001, layer_before_->NumDescendantsThatDrawContent());
+  EXPECT_EQ(1002, root_layer_->NumDescendantsThatDrawContent());
+}
+
+}  // namespace
+}  // namespace cc