// Copyright 2013 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/ui_resource_layer.h"

#include "base/threading/thread_task_runner_handle.h"
#include "cc/animation/animation_host.h"
#include "cc/resources/resource_provider.h"
#include "cc/resources/scoped_ui_resource.h"
#include "cc/test/fake_layer_tree_host.h"
#include "cc/test/fake_layer_tree_host_client.h"
#include "cc/test/fake_output_surface.h"
#include "cc/test/fake_output_surface_client.h"
#include "cc/test/geometry_test_utils.h"
#include "cc/test/stub_layer_tree_host_single_thread_client.h"
#include "cc/test/test_task_graph_runner.h"
#include "cc/trees/layer_tree_host.h"
#include "cc/trees/single_thread_proxy.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/skia/include/core/SkBitmap.h"

using ::testing::Mock;
using ::testing::_;
using ::testing::AtLeast;
using ::testing::AnyNumber;

namespace cc {
namespace {

class TestUIResourceLayer : public UIResourceLayer {
 public:
  static scoped_refptr<TestUIResourceLayer> Create() {
    return make_scoped_refptr(new TestUIResourceLayer());
  }

  UIResourceId GetUIResourceId() {
    if (ui_resource_holder_)
      return ui_resource_holder_->id();
    return 0;
  }

 protected:
  TestUIResourceLayer() : UIResourceLayer() { SetIsDrawable(true); }
  ~TestUIResourceLayer() override {}
};

class UIResourceLayerTest : public testing::Test {
 protected:
  void SetUp() override {
    animation_host_ = AnimationHost::CreateForTesting(ThreadInstance::MAIN);
    layer_tree_host_ = FakeLayerTreeHost::Create(
        &fake_client_, &task_graph_runner_, animation_host_.get());
    layer_tree_host_->InitializeSingleThreaded(
        &single_thread_client_, base::ThreadTaskRunnerHandle::Get());
  }

  void TearDown() override {
    Mock::VerifyAndClearExpectations(layer_tree_host_.get());
  }

  FakeLayerTreeHostClient fake_client_;
  StubLayerTreeHostSingleThreadClient single_thread_client_;
  TestTaskGraphRunner task_graph_runner_;
  std::unique_ptr<AnimationHost> animation_host_;
  std::unique_ptr<FakeLayerTreeHost> layer_tree_host_;
};

TEST_F(UIResourceLayerTest, SetBitmap) {
  scoped_refptr<UIResourceLayer> test_layer = TestUIResourceLayer::Create();
  ASSERT_TRUE(test_layer.get());
  test_layer->SetBounds(gfx::Size(100, 100));

  layer_tree_host_->SetRootLayer(test_layer);
  Mock::VerifyAndClearExpectations(layer_tree_host_.get());
  EXPECT_EQ(test_layer->GetLayerTreeHostForTesting(), layer_tree_host_.get());

  test_layer->SavePaintProperties();
  test_layer->Update();

  EXPECT_FALSE(test_layer->DrawsContent());

  SkBitmap bitmap;
  bitmap.allocN32Pixels(10, 10);
  bitmap.setImmutable();

  test_layer->SetBitmap(bitmap);
  test_layer->Update();

  EXPECT_TRUE(test_layer->DrawsContent());
}

TEST_F(UIResourceLayerTest, SetUIResourceId) {
  scoped_refptr<TestUIResourceLayer> test_layer = TestUIResourceLayer::Create();
  ASSERT_TRUE(test_layer.get());
  test_layer->SetBounds(gfx::Size(100, 100));

  layer_tree_host_->SetRootLayer(test_layer);
  Mock::VerifyAndClearExpectations(layer_tree_host_.get());
  EXPECT_EQ(test_layer->GetLayerTreeHostForTesting(), layer_tree_host_.get());

  test_layer->SavePaintProperties();
  test_layer->Update();

  EXPECT_FALSE(test_layer->DrawsContent());

  bool is_opaque = false;
  std::unique_ptr<ScopedUIResource> resource =
      ScopedUIResource::Create(layer_tree_host_->GetUIResourceManager(),
                               UIResourceBitmap(gfx::Size(10, 10), is_opaque));
  test_layer->SetUIResourceId(resource->id());
  test_layer->Update();

  EXPECT_TRUE(test_layer->DrawsContent());

  // ID is preserved even when you set ID first and attach it to the tree.
  layer_tree_host_->SetRootLayer(nullptr);
  std::unique_ptr<ScopedUIResource> shared_resource =
      ScopedUIResource::Create(layer_tree_host_->GetUIResourceManager(),
                               UIResourceBitmap(gfx::Size(5, 5), is_opaque));
  test_layer->SetUIResourceId(shared_resource->id());
  layer_tree_host_->SetRootLayer(test_layer);
  EXPECT_EQ(shared_resource->id(), test_layer->GetUIResourceId());
  EXPECT_TRUE(test_layer->DrawsContent());
}

TEST_F(UIResourceLayerTest, BitmapClearedOnSetUIResourceId) {
  scoped_refptr<UIResourceLayer> test_layer = TestUIResourceLayer::Create();
  ASSERT_TRUE(test_layer.get());
  test_layer->SetBounds(gfx::Size(100, 100));

  SkBitmap bitmap;
  bitmap.allocN32Pixels(10, 10);
  bitmap.setImmutable();
  ASSERT_FALSE(bitmap.isNull());
  ASSERT_TRUE(bitmap.pixelRef()->unique());

  test_layer->SetBitmap(bitmap);
  ASSERT_FALSE(bitmap.pixelRef()->unique());

  test_layer->SetUIResourceId(0);
  EXPECT_TRUE(bitmap.pixelRef()->unique());
}

}  // namespace
}  // namespace cc