// 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 "base/containers/hash_tables.h"
#include "cc/layers/append_quads_data.h"
#include "cc/layers/nine_patch_layer_impl.h"
#include "cc/quads/texture_draw_quad.h"
#include "cc/resources/ui_resource_bitmap.h"
#include "cc/resources/ui_resource_client.h"
#include "cc/test/fake_impl_proxy.h"
#include "cc/test/fake_ui_resource_layer_tree_host_impl.h"
#include "cc/test/geometry_test_utils.h"
#include "cc/test/layer_test_common.h"
#include "cc/trees/single_thread_proxy.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "ui/gfx/geometry/rect_conversions.h"
#include "ui/gfx/geometry/safe_integer_conversions.h"
#include "ui/gfx/transform.h"

namespace cc {
namespace {

gfx::Rect ToRoundedIntRect(const gfx::RectF& rect_f) {
  return gfx::Rect(gfx::ToRoundedInt(rect_f.x()),
                   gfx::ToRoundedInt(rect_f.y()),
                   gfx::ToRoundedInt(rect_f.width()),
                   gfx::ToRoundedInt(rect_f.height()));
}

void NinePatchLayerLayoutTest(const gfx::Size& bitmap_size,
                              const gfx::Rect& aperture_rect,
                              const gfx::Size& layer_size,
                              const gfx::Rect& border,
                              bool fill_center,
                              size_t expected_quad_size) {
  scoped_ptr<RenderPass> render_pass = RenderPass::Create();
  gfx::Rect visible_content_rect(layer_size);
  gfx::Rect expected_remaining(border.x(),
                               border.y(),
                               layer_size.width() - border.width(),
                               layer_size.height() - border.height());

  FakeImplProxy proxy;
  TestSharedBitmapManager shared_bitmap_manager;
  FakeUIResourceLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
  scoped_ptr<NinePatchLayerImpl> layer =
      NinePatchLayerImpl::Create(host_impl.active_tree(), 1);
  layer->draw_properties().visible_content_rect = visible_content_rect;
  layer->SetBounds(layer_size);
  layer->SetContentBounds(layer_size);
  layer->CreateRenderSurface();
  layer->draw_properties().render_target = layer.get();

  UIResourceId uid = 1;
  bool is_opaque = false;
  UIResourceBitmap bitmap(bitmap_size, is_opaque);

  host_impl.CreateUIResource(uid, bitmap);
  layer->SetUIResourceId(uid);
  layer->SetImageBounds(bitmap_size);
  layer->SetLayout(aperture_rect, border, fill_center);
  AppendQuadsData data;
  layer->AppendQuads(render_pass.get(), Occlusion(), &data);

  // Verify quad rects
  const QuadList& quads = render_pass->quad_list;
  EXPECT_EQ(expected_quad_size, quads.size());

  Region remaining(visible_content_rect);
  for (auto iter = quads.cbegin(); iter != quads.cend(); ++iter) {
    gfx::Rect quad_rect = iter->rect;

    EXPECT_TRUE(visible_content_rect.Contains(quad_rect)) << iter.index();
    EXPECT_TRUE(remaining.Contains(quad_rect)) << iter.index();
    remaining.Subtract(Region(quad_rect));
  }

  // Check if the left-over quad is the same size as the mapped aperture quad in
  // layer space.
  if (!fill_center) {
    EXPECT_RECT_EQ(expected_remaining, gfx::ToEnclosedRect(remaining.bounds()));
  } else {
    EXPECT_TRUE(remaining.bounds().IsEmpty());
  }

  // Verify UV rects
  gfx::Rect bitmap_rect(bitmap_size);
  Region tex_remaining(bitmap_rect);
  for (const auto& quad : quads) {
    const TextureDrawQuad* tex_quad = TextureDrawQuad::MaterialCast(&quad);
    gfx::RectF tex_rect =
        gfx::BoundingRect(tex_quad->uv_top_left, tex_quad->uv_bottom_right);
    tex_rect.Scale(bitmap_size.width(), bitmap_size.height());
    tex_remaining.Subtract(Region(ToRoundedIntRect(tex_rect)));
  }

  if (!fill_center) {
    EXPECT_RECT_EQ(aperture_rect, tex_remaining.bounds());
    Region aperture_region(aperture_rect);
    EXPECT_EQ(aperture_region, tex_remaining);
  } else {
    EXPECT_TRUE(remaining.bounds().IsEmpty());
  }
}

TEST(NinePatchLayerImplTest, VerifyDrawQuads) {
  // Input is a 100x100 bitmap with a 40x50 aperture at x=20, y=30.
  // The bounds of the layer are set to 400x400.
  gfx::Size bitmap_size(100, 100);
  gfx::Size layer_size(400, 500);
  gfx::Rect aperture_rect(20, 30, 40, 50);
  gfx::Rect border(40, 40, 80, 80);
  bool fill_center = false;
  size_t expected_quad_size = 8;
  NinePatchLayerLayoutTest(bitmap_size,
                           aperture_rect,
                           layer_size,
                           border,
                           fill_center,
                           expected_quad_size);

  // The bounds of the layer are set to less than the bitmap size.
  bitmap_size = gfx::Size(100, 100);
  layer_size = gfx::Size(40, 50);
  aperture_rect = gfx::Rect(20, 30, 40, 50);
  border = gfx::Rect(10, 10, 25, 15);
  fill_center = true;
  expected_quad_size = 9;
  NinePatchLayerLayoutTest(bitmap_size,
                           aperture_rect,
                           layer_size,
                           border,
                           fill_center,
                           expected_quad_size);

  // Layer and image sizes are equal.
  bitmap_size = gfx::Size(100, 100);
  layer_size = gfx::Size(100, 100);
  aperture_rect = gfx::Rect(20, 30, 40, 50);
  border = gfx::Rect(20, 30, 40, 50);
  fill_center = true;
  expected_quad_size = 9;
  NinePatchLayerLayoutTest(bitmap_size,
                           aperture_rect,
                           layer_size,
                           border,
                           fill_center,
                           expected_quad_size);
}

TEST(NinePatchLayerImplTest, VerifyDrawQuadsWithEmptyPatches) {
  // The top component of the 9-patch is empty, so there should be no quads for
  // the top three components.
  gfx::Size bitmap_size(100, 100);
  gfx::Size layer_size(100, 100);
  gfx::Rect aperture_rect(10, 0, 80, 90);
  gfx::Rect border(10, 0, 20, 10);
  bool fill_center = false;
  size_t expected_quad_size = 5;
  NinePatchLayerLayoutTest(bitmap_size,
                           aperture_rect,
                           layer_size,
                           border,
                           fill_center,
                           expected_quad_size);

  // The top and left components of the 9-patch are empty, so there should be no
  // quads for the left and top components.
  bitmap_size = gfx::Size(100, 100);
  layer_size = gfx::Size(100, 100);
  aperture_rect = gfx::Rect(0, 0, 90, 90);
  border = gfx::Rect(0, 0, 10, 10);
  fill_center = false;
  expected_quad_size = 3;
  NinePatchLayerLayoutTest(bitmap_size,
                           aperture_rect,
                           layer_size,
                           border,
                           fill_center,
                           expected_quad_size);

  // The aperture is the size of the bitmap and the center doesn't draw.
  bitmap_size = gfx::Size(100, 100);
  layer_size = gfx::Size(100, 100);
  aperture_rect = gfx::Rect(0, 0, 100, 100);
  border = gfx::Rect(0, 0, 0, 0);
  fill_center = false;
  expected_quad_size = 0;
  NinePatchLayerLayoutTest(bitmap_size,
                           aperture_rect,
                           layer_size,
                           border,
                           fill_center,
                           expected_quad_size);

  // The aperture is the size of the bitmap and the center does draw.
  bitmap_size = gfx::Size(100, 100);
  layer_size = gfx::Size(100, 100);
  aperture_rect = gfx::Rect(0, 0, 100, 100);
  border = gfx::Rect(0, 0, 0, 0);
  fill_center = true;
  expected_quad_size = 1;
  NinePatchLayerLayoutTest(bitmap_size,
                           aperture_rect,
                           layer_size,
                           border,
                           fill_center,
                           expected_quad_size);
}

TEST(NinePatchLayerImplTest, Occlusion) {
  gfx::Size layer_size(1000, 1000);
  gfx::Size viewport_size(1000, 1000);

  LayerTestCommon::LayerImplTest impl;

  SkBitmap sk_bitmap;
  sk_bitmap.allocN32Pixels(10, 10);
  sk_bitmap.setImmutable();
  UIResourceId uid = 5;
  UIResourceBitmap bitmap(sk_bitmap);
  impl.host_impl()->CreateUIResource(uid, bitmap);

  NinePatchLayerImpl* nine_patch_layer_impl =
      impl.AddChildToRoot<NinePatchLayerImpl>();
  nine_patch_layer_impl->SetBounds(layer_size);
  nine_patch_layer_impl->SetContentBounds(layer_size);
  nine_patch_layer_impl->SetDrawsContent(true);
  nine_patch_layer_impl->SetUIResourceId(uid);
  nine_patch_layer_impl->SetImageBounds(gfx::Size(10, 10));

  gfx::Rect aperture = gfx::Rect(3, 3, 4, 4);
  gfx::Rect border = gfx::Rect(300, 300, 400, 400);
  nine_patch_layer_impl->SetLayout(aperture, border, true);

  impl.CalcDrawProps(viewport_size);

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

    LayerTestCommon::VerifyQuadsExactlyCoverRect(impl.quad_list(),
                                                 gfx::Rect(layer_size));
    EXPECT_EQ(9u, impl.quad_list().size());
  }

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

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

  {
    SCOPED_TRACE("Partial occlusion");
    gfx::Rect occluded(0, 0, 500, 1000);
    impl.AppendQuadsWithOcclusion(nine_patch_layer_impl, occluded);

    size_t partially_occluded_count = 0;
    LayerTestCommon::VerifyQuadsAreOccluded(
        impl.quad_list(), occluded, &partially_occluded_count);
    // The layer outputs nine quads, three of which are partially occluded, and
    // three fully occluded.
    EXPECT_EQ(6u, impl.quad_list().size());
    EXPECT_EQ(3u, partially_occluded_count);
  }
}

}  // namespace
}  // namespace cc