// 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/delegated_frame_provider.h"
#include "cc/layers/delegated_frame_resource_collection.h"
#include "cc/layers/delegated_renderer_layer.h"
#include "cc/output/delegated_frame_data.h"
#include "cc/quads/texture_draw_quad.h"
#include "cc/resources/returned_resource.h"
#include "cc/resources/transferable_resource.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace cc {
namespace {

class DelegatedFrameProviderTest
    : public testing::Test,
      public DelegatedFrameResourceCollectionClient {
 protected:
  DelegatedFrameProviderTest() : resources_available_(false) {}

  scoped_ptr<DelegatedFrameData> CreateFrameData(
          const gfx::Rect& root_output_rect,
          const gfx::Rect& root_damage_rect) {
    scoped_ptr<DelegatedFrameData> frame(new DelegatedFrameData);

    scoped_ptr<RenderPass> root_pass(RenderPass::Create());
    root_pass->SetNew(RenderPassId(1, 1),
                      root_output_rect,
                      root_damage_rect,
                      gfx::Transform());
    frame->render_pass_list.push_back(root_pass.Pass());
    return frame.Pass();
  }

  void AddTransferableResource(DelegatedFrameData* frame,
                               ResourceProvider::ResourceId resource_id) {
    TransferableResource resource;
    resource.id = resource_id;
    resource.mailbox_holder.texture_target = GL_TEXTURE_2D;
    frame->resource_list.push_back(resource);
  }

  void AddTextureQuad(DelegatedFrameData* frame,
                      ResourceProvider::ResourceId resource_id) {
    SharedQuadState* sqs =
        frame->render_pass_list[0]->CreateAndAppendSharedQuadState();
    TextureDrawQuad* quad =
        frame->render_pass_list[0]->CreateAndAppendDrawQuad<TextureDrawQuad>();
    float vertex_opacity[4] = {1.f, 1.f, 1.f, 1.f};
    quad->SetNew(sqs,
                 gfx::Rect(0, 0, 10, 10),
                 gfx::Rect(0, 0, 10, 10),
                 gfx::Rect(0, 0, 10, 10),
                 resource_id,
                 false,
                 gfx::PointF(0.f, 0.f),
                 gfx::PointF(1.f, 1.f),
                 SK_ColorTRANSPARENT,
                 vertex_opacity,
                 false);
  }

  virtual void SetUp() override {
    resource_collection_ = new DelegatedFrameResourceCollection;
    resource_collection_->SetClient(this);
  }

  virtual void TearDown() override { resource_collection_->SetClient(nullptr); }

  void UnusedResourcesAreAvailable() override {
    resources_available_ = true;
    resource_collection_->TakeUnusedResourcesForChildCompositor(&resources_);
  }

  bool ReturnAndResetResourcesAvailable() {
    bool r = resources_available_;
    resources_available_ = false;
    return r;
  }

  void SetFrameProvider(scoped_ptr<DelegatedFrameData> frame_data) {
    frame_provider_ =
        new DelegatedFrameProvider(resource_collection_, frame_data.Pass());
  }

  scoped_refptr<DelegatedFrameResourceCollection> resource_collection_;
  scoped_refptr<DelegatedFrameProvider> frame_provider_;
  bool resources_available_;
  ReturnedResourceArray resources_;
};

TEST_F(DelegatedFrameProviderTest, SameResources) {
  scoped_ptr<DelegatedFrameData> frame =
      CreateFrameData(gfx::Rect(1, 1), gfx::Rect(1, 1));
  AddTextureQuad(frame.get(), 444);
  AddTransferableResource(frame.get(), 444);
  SetFrameProvider(frame.Pass());

  frame = CreateFrameData(gfx::Rect(1, 1), gfx::Rect(1, 1));
  AddTextureQuad(frame.get(), 444);
  AddTransferableResource(frame.get(), 444);
  SetFrameProvider(frame.Pass());

  EXPECT_FALSE(ReturnAndResetResourcesAvailable());
  EXPECT_EQ(0u, resources_.size());

  frame_provider_ = nullptr;

  EXPECT_TRUE(ReturnAndResetResourcesAvailable());
  EXPECT_EQ(1u, resources_.size());
  EXPECT_EQ(444u, resources_[0].id);
}

TEST_F(DelegatedFrameProviderTest, ReplaceResources) {
  scoped_ptr<DelegatedFrameData> frame =
      CreateFrameData(gfx::Rect(1, 1), gfx::Rect(1, 1));
  AddTextureQuad(frame.get(), 444);
  AddTransferableResource(frame.get(), 444);
  SetFrameProvider(frame.Pass());

  EXPECT_FALSE(ReturnAndResetResourcesAvailable());

  frame = CreateFrameData(gfx::Rect(1, 1), gfx::Rect(1, 1));
  AddTextureQuad(frame.get(), 555);
  AddTransferableResource(frame.get(), 555);
  SetFrameProvider(frame.Pass());

  EXPECT_TRUE(ReturnAndResetResourcesAvailable());
  EXPECT_EQ(1u, resources_.size());
  EXPECT_EQ(444u, resources_[0].id);
  resources_.clear();

  frame_provider_ = nullptr;

  EXPECT_TRUE(ReturnAndResetResourcesAvailable());
  EXPECT_EQ(1u, resources_.size());
  EXPECT_EQ(555u, resources_[0].id);
}

TEST_F(DelegatedFrameProviderTest, RefResources) {
  scoped_ptr<DelegatedFrameData> frame =
      CreateFrameData(gfx::Rect(5, 5), gfx::Rect(2, 2));
  AddTextureQuad(frame.get(), 444);
  AddTransferableResource(frame.get(), 444);

  TransferableResourceArray reffed = frame->resource_list;
  ReturnedResourceArray returned;
  TransferableResource::ReturnResources(reffed, &returned);

  SetFrameProvider(frame.Pass());

  scoped_refptr<DelegatedRendererLayer> observer1 =
      DelegatedRendererLayer::Create(frame_provider_);
  scoped_refptr<DelegatedRendererLayer> observer2 =
      DelegatedRendererLayer::Create(frame_provider_);

  gfx::RectF damage;

  // Both observers get a full frame of damage on the first request.
  frame_provider_->GetFrameDataAndRefResources(observer1.get(), &damage);
  EXPECT_EQ(gfx::RectF(5.f, 5.f).ToString(), damage.ToString());
  frame_provider_->GetFrameDataAndRefResources(observer2.get(), &damage);
  EXPECT_EQ(gfx::RectF(5.f, 5.f).ToString(), damage.ToString());

  // And both get no damage on the 2nd request. This adds a second ref to the
  // resources.
  frame_provider_->GetFrameDataAndRefResources(observer1.get(), &damage);
  EXPECT_EQ(gfx::RectF().ToString(), damage.ToString());
  frame_provider_->GetFrameDataAndRefResources(observer2.get(), &damage);
  EXPECT_EQ(gfx::RectF().ToString(), damage.ToString());

  EXPECT_FALSE(ReturnAndResetResourcesAvailable());

  frame = CreateFrameData(gfx::Rect(5, 5), gfx::Rect(2, 2));
  AddTextureQuad(frame.get(), 555);
  AddTransferableResource(frame.get(), 555);
  frame_provider_->SetFrameData(frame.Pass());

  // The resources from the first frame are still reffed by the observers.
  EXPECT_FALSE(ReturnAndResetResourcesAvailable());

  // There are 4 refs taken.
  frame_provider_->UnrefResourcesOnMainThread(returned);
  EXPECT_FALSE(ReturnAndResetResourcesAvailable());
  frame_provider_->UnrefResourcesOnMainThread(returned);
  EXPECT_FALSE(ReturnAndResetResourcesAvailable());
  frame_provider_->UnrefResourcesOnMainThread(returned);
  EXPECT_FALSE(ReturnAndResetResourcesAvailable());

  // The 4th unref will release them.
  frame_provider_->UnrefResourcesOnMainThread(returned);

  EXPECT_TRUE(ReturnAndResetResourcesAvailable());
  EXPECT_EQ(1u, resources_.size());
  EXPECT_EQ(444u, resources_[0].id);
}

TEST_F(DelegatedFrameProviderTest, RefResourcesInFrameProvider) {
  scoped_ptr<DelegatedFrameData> frame =
      CreateFrameData(gfx::Rect(5, 5), gfx::Rect(2, 2));
  AddTextureQuad(frame.get(), 444);
  AddTransferableResource(frame.get(), 444);

  TransferableResourceArray reffed = frame->resource_list;
  ReturnedResourceArray returned;
  TransferableResource::ReturnResources(reffed, &returned);

  SetFrameProvider(frame.Pass());

  scoped_refptr<DelegatedRendererLayer> observer1 =
      DelegatedRendererLayer::Create(frame_provider_);
  scoped_refptr<DelegatedRendererLayer> observer2 =
      DelegatedRendererLayer::Create(frame_provider_);

  gfx::RectF damage;

  // Take a ref on each observer.
  frame_provider_->GetFrameDataAndRefResources(observer1.get(), &damage);
  frame_provider_->GetFrameDataAndRefResources(observer2.get(), &damage);

  EXPECT_FALSE(ReturnAndResetResourcesAvailable());

  // Release both refs. But there's still a ref held in the frame
  // provider itself.
  frame_provider_->UnrefResourcesOnMainThread(returned);
  frame_provider_->UnrefResourcesOnMainThread(returned);
  EXPECT_FALSE(ReturnAndResetResourcesAvailable());

  // Setting a new frame will release it.
  frame = CreateFrameData(gfx::Rect(5, 5), gfx::Rect(2, 2));
  AddTextureQuad(frame.get(), 555);
  AddTransferableResource(frame.get(), 555);
  frame_provider_->SetFrameData(frame.Pass());

  EXPECT_TRUE(ReturnAndResetResourcesAvailable());
  EXPECT_EQ(1u, resources_.size());
  EXPECT_EQ(444u, resources_[0].id);
}

TEST_F(DelegatedFrameProviderTest, RefResourcesInFrameProviderUntilDestroy) {
  scoped_ptr<DelegatedFrameData> frame =
      CreateFrameData(gfx::Rect(5, 5), gfx::Rect(2, 2));
  AddTextureQuad(frame.get(), 444);
  AddTransferableResource(frame.get(), 444);

  TransferableResourceArray reffed = frame->resource_list;
  ReturnedResourceArray returned;
  TransferableResource::ReturnResources(reffed, &returned);

  SetFrameProvider(frame.Pass());

  scoped_refptr<DelegatedRendererLayer> observer1 =
      DelegatedRendererLayer::Create(frame_provider_);
  scoped_refptr<DelegatedRendererLayer> observer2 =
      DelegatedRendererLayer::Create(frame_provider_);

  gfx::RectF damage;

  // Take a ref on each observer.
  frame_provider_->GetFrameDataAndRefResources(observer1.get(), &damage);
  frame_provider_->GetFrameDataAndRefResources(observer2.get(), &damage);

  EXPECT_FALSE(ReturnAndResetResourcesAvailable());

  // Release both refs. But there's still a ref held in the frame
  // provider itself.
  frame_provider_->UnrefResourcesOnMainThread(returned);
  frame_provider_->UnrefResourcesOnMainThread(returned);
  EXPECT_FALSE(ReturnAndResetResourcesAvailable());

  // Releasing all references to the frame provider will release
  // the frame.
  observer1 = nullptr;
  observer2 = nullptr;
  EXPECT_FALSE(ReturnAndResetResourcesAvailable());

  frame_provider_ = nullptr;

  EXPECT_TRUE(ReturnAndResetResourcesAvailable());
  EXPECT_EQ(1u, resources_.size());
  EXPECT_EQ(444u, resources_[0].id);
}

TEST_F(DelegatedFrameProviderTest, Damage) {
  scoped_ptr<DelegatedFrameData> frame =
      CreateFrameData(gfx::Rect(5, 5), gfx::Rect(2, 2));
  AddTextureQuad(frame.get(), 444);
  AddTransferableResource(frame.get(), 444);

  TransferableResourceArray reffed = frame->resource_list;
  ReturnedResourceArray returned;
  TransferableResource::ReturnResources(reffed, &returned);

  SetFrameProvider(frame.Pass());

  scoped_refptr<DelegatedRendererLayer> observer1 =
      DelegatedRendererLayer::Create(frame_provider_);
  scoped_refptr<DelegatedRendererLayer> observer2 =
      DelegatedRendererLayer::Create(frame_provider_);

  gfx::RectF damage;

  // Both observers get a full frame of damage on the first request.
  frame_provider_->GetFrameDataAndRefResources(observer1.get(), &damage);
  EXPECT_EQ(gfx::RectF(5.f, 5.f).ToString(), damage.ToString());
  frame_provider_->GetFrameDataAndRefResources(observer2.get(), &damage);
  EXPECT_EQ(gfx::RectF(5.f, 5.f).ToString(), damage.ToString());

  // And both get no damage on the 2nd request.
  frame_provider_->GetFrameDataAndRefResources(observer1.get(), &damage);
  EXPECT_EQ(gfx::RectF().ToString(), damage.ToString());
  frame_provider_->GetFrameDataAndRefResources(observer2.get(), &damage);
  EXPECT_EQ(gfx::RectF().ToString(), damage.ToString());

  frame = CreateFrameData(gfx::Rect(5, 5), gfx::Rect(2, 2));
  AddTextureQuad(frame.get(), 555);
  AddTransferableResource(frame.get(), 555);
  frame_provider_->SetFrameData(frame.Pass());

  // Both observers get the damage for the new frame.
  frame_provider_->GetFrameDataAndRefResources(observer1.get(), &damage);
  EXPECT_EQ(gfx::RectF(2.f, 2.f).ToString(), damage.ToString());
  frame_provider_->GetFrameDataAndRefResources(observer2.get(), &damage);
  EXPECT_EQ(gfx::RectF(2.f, 2.f).ToString(), damage.ToString());

  // And both get no damage on the 2nd request.
  frame_provider_->GetFrameDataAndRefResources(observer1.get(), &damage);
  EXPECT_EQ(gfx::RectF().ToString(), damage.ToString());
  frame_provider_->GetFrameDataAndRefResources(observer2.get(), &damage);
  EXPECT_EQ(gfx::RectF().ToString(), damage.ToString());
}

TEST_F(DelegatedFrameProviderTest, LostNothing) {
  scoped_ptr<DelegatedFrameData> frame =
      CreateFrameData(gfx::Rect(5, 5), gfx::Rect(5, 5));

  TransferableResourceArray reffed = frame->resource_list;

  SetFrameProvider(frame.Pass());

  // There is nothing to lose.
  EXPECT_FALSE(ReturnAndResetResourcesAvailable());
  EXPECT_FALSE(resource_collection_->LoseAllResources());
  EXPECT_FALSE(ReturnAndResetResourcesAvailable());
  EXPECT_EQ(0u, resources_.size());
}

TEST_F(DelegatedFrameProviderTest, LostSomething) {
  scoped_ptr<DelegatedFrameData> frame =
      CreateFrameData(gfx::Rect(5, 5), gfx::Rect(5, 5));
  AddTextureQuad(frame.get(), 444);
  AddTransferableResource(frame.get(), 444);

  SetFrameProvider(frame.Pass());

  // Add a second reference on the resource.
  frame = CreateFrameData(gfx::Rect(5, 5), gfx::Rect(5, 5));
  AddTextureQuad(frame.get(), 444);
  AddTransferableResource(frame.get(), 444);

  SetFrameProvider(frame.Pass());

  // There is something to lose.
  EXPECT_FALSE(ReturnAndResetResourcesAvailable());
  EXPECT_TRUE(resource_collection_->LoseAllResources());
  EXPECT_TRUE(ReturnAndResetResourcesAvailable());

  EXPECT_EQ(1u, resources_.size());
  EXPECT_EQ(444u, resources_[0].id);
  EXPECT_EQ(2, resources_[0].count);
}

TEST_F(DelegatedFrameProviderTest, NothingReturnedAfterLoss) {
  scoped_ptr<DelegatedFrameData> frame =
      CreateFrameData(gfx::Rect(1, 1), gfx::Rect(1, 1));
  AddTextureQuad(frame.get(), 444);
  AddTransferableResource(frame.get(), 444);
  SetFrameProvider(frame.Pass());

  EXPECT_FALSE(ReturnAndResetResourcesAvailable());

  // Lose all the resources.
  EXPECT_TRUE(resource_collection_->LoseAllResources());
  EXPECT_TRUE(ReturnAndResetResourcesAvailable());
  resources_.clear();

  frame_provider_ = nullptr;

  // Nothing is returned twice.
  EXPECT_FALSE(ReturnAndResetResourcesAvailable());
  EXPECT_EQ(0u, resources_.size());
}

}  // namespace
}  // namespace cc