// Copyright 2014 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/surface_layer_impl.h"

#include <stddef.h>

#include "cc/test/layer_test_common.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace cc {
namespace {

static constexpr FrameSinkId kArbitraryFrameSinkId(1, 1);

TEST(SurfaceLayerImplTest, Occlusion) {
  gfx::Size layer_size(1000, 1000);
  gfx::Size viewport_size(1000, 1000);
  const LocalFrameId kArbitraryLocalFrameId(9,
                                            base::UnguessableToken::Create());

  LayerTestCommon::LayerImplTest impl;

  SurfaceLayerImpl* surface_layer_impl =
      impl.AddChildToRoot<SurfaceLayerImpl>();
  surface_layer_impl->SetBounds(layer_size);
  surface_layer_impl->SetDrawsContent(true);
  SurfaceId surface_id(kArbitraryFrameSinkId, kArbitraryLocalFrameId);
  surface_layer_impl->SetSurfaceId(surface_id);
  surface_layer_impl->SetSurfaceScale(1.f);
  surface_layer_impl->SetSurfaceSize(layer_size);

  impl.CalcDrawProps(viewport_size);

  {
    SCOPED_TRACE("No occlusion");
    gfx::Rect occluded;
    impl.AppendQuadsWithOcclusion(surface_layer_impl, occluded);

    LayerTestCommon::VerifyQuadsExactlyCoverRect(impl.quad_list(),
                                                 gfx::Rect(layer_size));
    EXPECT_EQ(1u, impl.quad_list().size());
  }

  {
    SCOPED_TRACE("Full occlusion");
    gfx::Rect occluded(surface_layer_impl->visible_layer_rect());
    impl.AppendQuadsWithOcclusion(surface_layer_impl, occluded);

    LayerTestCommon::VerifyQuadsExactlyCoverRect(impl.quad_list(), gfx::Rect());
    EXPECT_EQ(impl.quad_list().size(), 0u);
  }

  {
    SCOPED_TRACE("Partial occlusion");
    gfx::Rect occluded(200, 0, 800, 1000);
    impl.AppendQuadsWithOcclusion(surface_layer_impl, occluded);

    size_t partially_occluded_count = 0;
    LayerTestCommon::VerifyQuadsAreOccluded(
        impl.quad_list(), occluded, &partially_occluded_count);
    // The layer outputs one quad, which is partially occluded.
    EXPECT_EQ(1u, impl.quad_list().size());
    EXPECT_EQ(1u, partially_occluded_count);
  }
}

}  // namespace
}  // namespace cc