// 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 <stddef.h>

#include "build/build_config.h"
#include "cc/layers/picture_layer.h"
#include "cc/layers/solid_color_layer.h"
#include "cc/test/fake_content_layer_client.h"
#include "cc/test/layer_tree_pixel_test.h"
#include "cc/test/pixel_comparator.h"
#include "cc/test/solid_color_content_layer_client.h"

#if !defined(OS_ANDROID)

namespace cc {
namespace {

class LayerTreeHostFiltersPixelTest : public LayerTreePixelTest {};

TEST_F(LayerTreeHostFiltersPixelTest, BackdropFilterBlur) {
  scoped_refptr<SolidColorLayer> background = CreateSolidColorLayer(
      gfx::Rect(200, 200), SK_ColorWHITE);

  // The green box is entirely behind a layer with backdrop blur, so it
  // should appear blurred on its edges.
  scoped_refptr<SolidColorLayer> green = CreateSolidColorLayer(
      gfx::Rect(50, 50, 100, 100), kCSSGreen);
  scoped_refptr<SolidColorLayer> blur = CreateSolidColorLayer(
      gfx::Rect(30, 30, 140, 140), SK_ColorTRANSPARENT);
  background->AddChild(green);
  background->AddChild(blur);

  FilterOperations filters;
  filters.Append(FilterOperation::CreateBlurFilter(
      2.f, SkBlurImageFilter::kClamp_TileMode));
  blur->SetBackdropFilters(filters);
  gfx::RectF backdrop_filter_bounds(gfx::SizeF(blur->bounds()));
  blur->SetBackdropFilterBounds(backdrop_filter_bounds);

#if defined(OS_WIN) || defined(ARCH_CPU_ARM64)
  // Windows and ARM64 have 436 pixels off by 1: crbug.com/259915
  float percentage_pixels_large_error = 1.09f;  // 436px / (200*200)
  float percentage_pixels_small_error = 0.0f;
  float average_error_allowed_in_bad_pixels = 1.f;
  int large_error_allowed = 1;
  int small_error_allowed = 0;
  pixel_comparator_.reset(new FuzzyPixelComparator(
      true,  // discard_alpha
      percentage_pixels_large_error,
      percentage_pixels_small_error,
      average_error_allowed_in_bad_pixels,
      large_error_allowed,
      small_error_allowed));
#endif

  RunPixelTest(PIXEL_TEST_GL, background,
               base::FilePath(FILE_PATH_LITERAL("backdrop_filter_blur.png")));
}

TEST_F(LayerTreeHostFiltersPixelTest, BackdropFilterBlurOutsets) {
  scoped_refptr<SolidColorLayer> background = CreateSolidColorLayer(
      gfx::Rect(200, 200), SK_ColorWHITE);

  // The green border is outside the layer with backdrop blur, but the
  // backdrop blur should use pixels from outside its layer borders, up to the
  // radius of the blur effect. So the border should be blurred underneath the
  // top layer causing the green to bleed under the transparent layer, but not
  // in the 1px region between the transparent layer and the green border.
  scoped_refptr<SolidColorLayer> green_border = CreateSolidColorLayerWithBorder(
      gfx::Rect(1, 1, 198, 198), SK_ColorWHITE, 10, kCSSGreen);
  scoped_refptr<SolidColorLayer> blur = CreateSolidColorLayer(
      gfx::Rect(12, 12, 176, 176), SK_ColorTRANSPARENT);
  background->AddChild(green_border);
  background->AddChild(blur);

  FilterOperations filters;
  filters.Append(FilterOperation::CreateBlurFilter(
      5.f, SkBlurImageFilter::kClamp_TileMode));
  blur->SetBackdropFilters(filters);
  gfx::RectF backdrop_filter_bounds(gfx::SizeF(blur->bounds()));
  blur->SetBackdropFilterBounds(backdrop_filter_bounds);

#if defined(OS_WIN) || defined(_MIPS_ARCH_LOONGSON) || defined(ARCH_CPU_ARM64)
#if defined(OS_WIN) || defined(ARCH_CPU_ARM64)
  // Windows has 5.9325% pixels by at most 2: crbug.com/259922
  float percentage_pixels_large_error = 6.0f;
#else
  // Loongson has 8.685% pixels by at most 2: crbug.com/819110
  float percentage_pixels_large_error = 8.7f;
#endif
  float percentage_pixels_small_error = 0.0f;
  float average_error_allowed_in_bad_pixels = 2.f;
  int large_error_allowed = 2;
  int small_error_allowed = 0;
  pixel_comparator_.reset(new FuzzyPixelComparator(
      true,  // discard_alpha
      percentage_pixels_large_error,
      percentage_pixels_small_error,
      average_error_allowed_in_bad_pixels,
      large_error_allowed,
      small_error_allowed));
#endif

  RunPixelTest(
      PIXEL_TEST_GL, background,
      base::FilePath(FILE_PATH_LITERAL("backdrop_filter_blur_outsets.png")));
}

TEST_F(LayerTreeHostFiltersPixelTest, BackdropFilterBlurOffAxis) {
  scoped_refptr<SolidColorLayer> background =
      CreateSolidColorLayer(gfx::Rect(200, 200), SK_ColorTRANSPARENT);

  // This verifies that the perspective of the clear layer (with black border)
  // does not influence the blending of the green box behind it. Also verifies
  // that the blur is correctly clipped inside the transformed clear layer.
  scoped_refptr<SolidColorLayer> green = CreateSolidColorLayer(
      gfx::Rect(50, 50, 100, 100), kCSSGreen);
  scoped_refptr<SolidColorLayer> blur = CreateSolidColorLayerWithBorder(
      gfx::Rect(30, 30, 120, 120), SK_ColorTRANSPARENT, 1, SK_ColorBLACK);
  background->AddChild(green);
  background->AddChild(blur);

  background->SetShouldFlattenTransform(false);
  background->Set3dSortingContextId(1);
  green->SetShouldFlattenTransform(false);
  green->Set3dSortingContextId(1);
  gfx::Transform background_transform;
  background_transform.ApplyPerspectiveDepth(200.0);
  background->SetTransform(background_transform);

  blur->SetShouldFlattenTransform(false);
  blur->Set3dSortingContextId(1);
  for (size_t i = 0; i < blur->children().size(); ++i)
    blur->children()[i]->Set3dSortingContextId(1);

  gfx::Transform blur_transform;
  blur_transform.Translate(55.0, 65.0);
  blur_transform.RotateAboutXAxis(85.0);
  blur_transform.RotateAboutYAxis(180.0);
  blur_transform.RotateAboutZAxis(20.0);
  blur_transform.Translate(-60.0, -60.0);
  blur->SetTransform(blur_transform);

  FilterOperations filters;
  filters.Append(FilterOperation::CreateBlurFilter(
      2.f, SkBlurImageFilter::kClamp_TileMode));
  blur->SetBackdropFilters(filters);
  // TODO(916311): Fix clipping for 3D transformed elements.
  blur->SetBackdropFilterBounds(gfx::RectF());

#if defined(OS_WIN) || defined(ARCH_CPU_ARM64)
#if defined(OS_WIN)
  // Windows has 116 pixels off by at most 2: crbug.com/225027
  float percentage_pixels_large_error = 0.3f;  // 116px / (200*200), rounded up
  int large_error_allowed = 2;
#else
  float percentage_pixels_large_error = 0.25f;  // 96px / (200*200), rounded up
  int large_error_allowed = 1;
#endif
  float percentage_pixels_small_error = 0.0f;
  float average_error_allowed_in_bad_pixels = 1.f;
  int small_error_allowed = 0;
  pixel_comparator_.reset(new FuzzyPixelComparator(
      true,  // discard_alpha
      percentage_pixels_large_error,
      percentage_pixels_small_error,
      average_error_allowed_in_bad_pixels,
      large_error_allowed,
      small_error_allowed));
#endif

  RunPixelTest(
      PIXEL_TEST_GL, background,
      base::FilePath(FILE_PATH_LITERAL("backdrop_filter_blur_off_axis.png")));
}

class LayerTreeHostFiltersScaledPixelTest
    : public LayerTreeHostFiltersPixelTest {
  void InitializeSettings(LayerTreeSettings* settings) override {
    // Required so that device scale is inherited by content scale.
    settings->layer_transforms_should_scale_layer_contents = true;
  }

  void SetupTree() override {
    SetInitialDeviceScaleFactor(device_scale_factor_);
    LayerTreePixelTest::SetupTree();
  }

 protected:
  void RunPixelTestType(int content_size,
                        float device_scale_factor,
                        PixelTestType test_type) {
    int half_content = content_size / 2;

    scoped_refptr<SolidColorLayer> background = CreateSolidColorLayer(
        gfx::Rect(0, 0, content_size, content_size), SK_ColorGREEN);

    // Add a blue layer that completely covers the green layer.
    scoped_refptr<SolidColorLayer> foreground = CreateSolidColorLayer(
        gfx::Rect(0, 0, content_size, content_size), SK_ColorBLUE);
    background->AddChild(foreground);

    // Add an alpha threshold filter to the blue layer which will filter out
    // everything except the lower right corner.
    FilterOperations filters;
    FilterOperation::ShapeRects alpha_shape;
    alpha_shape.emplace_back(half_content, half_content, content_size,
                             content_size);
    filters.Append(
        FilterOperation::CreateAlphaThresholdFilter(alpha_shape, 1.f, 0.f));
    foreground->SetFilters(filters);

    device_scale_factor_ = device_scale_factor;
    RunPixelTest(
        test_type,
        background,
        base::FilePath(FILE_PATH_LITERAL("green_small_with_blue_corner.png")));
  }

  float device_scale_factor_;
};

TEST_F(LayerTreeHostFiltersScaledPixelTest, StandardDpi_GL) {
  RunPixelTestType(100, 1.f, PIXEL_TEST_GL);
}

TEST_F(LayerTreeHostFiltersScaledPixelTest, StandardDpi_Software) {
  RunPixelTestType(100, 1.f, PIXEL_TEST_SOFTWARE);
}

TEST_F(LayerTreeHostFiltersScaledPixelTest, HiDpi_GL) {
  RunPixelTestType(50, 2.f, PIXEL_TEST_GL);
}

TEST_F(LayerTreeHostFiltersScaledPixelTest, HiDpi_Software) {
  RunPixelTestType(50, 2.f, PIXEL_TEST_SOFTWARE);
}

class LayerTreeHostNullFilterPixelTest : public LayerTreeHostFiltersPixelTest {
  void InitializeSettings(LayerTreeSettings* settings) override {}

 protected:
  void RunPixelTestType(PixelTestType test_type) {
    scoped_refptr<SolidColorLayer> foreground =
        CreateSolidColorLayer(gfx::Rect(0, 0, 200, 200), SK_ColorGREEN);

    FilterOperations filters;
    filters.Append(FilterOperation::CreateReferenceFilter(nullptr));
    foreground->SetFilters(filters);

    RunPixelTest(test_type, foreground,
                 base::FilePath(FILE_PATH_LITERAL("green.png")));
  }
};

TEST_F(LayerTreeHostNullFilterPixelTest, GL) {
  RunPixelTestType(PIXEL_TEST_GL);
}

TEST_F(LayerTreeHostNullFilterPixelTest, Software) {
  RunPixelTestType(PIXEL_TEST_SOFTWARE);
}

class LayerTreeHostCroppedFilterPixelTest
    : public LayerTreeHostFiltersPixelTest {
  void InitializeSettings(LayerTreeSettings* settings) override {}

 protected:
  void RunPixelTestType(PixelTestType test_type) {
    scoped_refptr<SolidColorLayer> foreground =
        CreateSolidColorLayer(gfx::Rect(0, 0, 200, 200), SK_ColorGREEN);

    // Check that a filter with a zero-height crop rect crops out its
    // result completely.
    FilterOperations filters;
    SkImageFilter::CropRect cropRect(SkRect::MakeXYWH(0, 0, 100, 0));
    sk_sp<PaintFilter> offset(
        sk_make_sp<OffsetPaintFilter>(0, 0, nullptr, &cropRect));
    filters.Append(FilterOperation::CreateReferenceFilter(offset));
    foreground->SetFilters(filters);

    RunPixelTest(test_type, foreground,
                 base::FilePath(FILE_PATH_LITERAL("white.png")));
  }
};

TEST_F(LayerTreeHostCroppedFilterPixelTest, GL) {
  RunPixelTestType(PIXEL_TEST_GL);
}

TEST_F(LayerTreeHostCroppedFilterPixelTest, Software) {
  RunPixelTestType(PIXEL_TEST_SOFTWARE);
}

class ImageFilterClippedPixelTest : public LayerTreeHostFiltersPixelTest {
 protected:
  void RunPixelTestType(PixelTestType test_type) {
    scoped_refptr<SolidColorLayer> background =
        CreateSolidColorLayer(gfx::Rect(200, 200), SK_ColorYELLOW);

    scoped_refptr<SolidColorLayer> foreground =
        CreateSolidColorLayer(gfx::Rect(200, 200), SK_ColorRED);
    background->AddChild(foreground);

    SkScalar matrix[20];
    memset(matrix, 0, 20 * sizeof(matrix[0]));
    // This filter does a red-blue swap, so the foreground becomes blue.
    matrix[2] = matrix[6] = matrix[10] = matrix[18] = SK_Scalar1;
    // We filter only the bottom 200x100 pixels of the foreground.
    SkImageFilter::CropRect crop_rect(SkRect::MakeXYWH(0, 100, 200, 100));
    FilterOperations filters;
    filters.Append(FilterOperation::CreateReferenceFilter(
        sk_make_sp<ColorFilterPaintFilter>(
            SkColorFilter::MakeMatrixFilterRowMajor255(matrix), nullptr,
            &crop_rect)));

    // Make the foreground layer's render surface be clipped by the background
    // layer.
    background->SetMasksToBounds(true);
    foreground->SetFilters(filters);

    // Then we translate the foreground up by 100 pixels in Y, so the cropped
    // region is moved to to the top. This ensures that the crop rect is being
    // correctly transformed in skia by the amount of clipping that the
    // compositor performs.
    gfx::Transform transform;
    transform.Translate(0.0, -100.0);
    foreground->SetTransform(transform);

    RunPixelTest(test_type,
                 background,
                 base::FilePath(FILE_PATH_LITERAL("blue_yellow.png")));
  }
};

TEST_F(ImageFilterClippedPixelTest, ImageFilterClipped_GL) {
  RunPixelTestType(PIXEL_TEST_GL);
}

TEST_F(ImageFilterClippedPixelTest, ImageFilterClipped_Software) {
  RunPixelTestType(PIXEL_TEST_SOFTWARE);
}

class ImageFilterNonZeroOriginPixelTest : public LayerTreeHostFiltersPixelTest {
 protected:
  void RunPixelTestType(PixelTestType test_type) {
    scoped_refptr<SolidColorLayer> background =
        CreateSolidColorLayer(gfx::Rect(200, 200), SK_ColorYELLOW);

    scoped_refptr<SolidColorLayer> foreground =
        CreateSolidColorLayer(gfx::Rect(200, 200), SK_ColorRED);
    background->AddChild(foreground);

    SkScalar matrix[20];
    memset(matrix, 0, 20 * sizeof(matrix[0]));
    // This filter does a red-blue swap, so the foreground becomes blue.
    matrix[2] = matrix[6] = matrix[10] = matrix[18] = SK_Scalar1;
    // Set up a crop rec to filter the bottom 200x100 pixels of the foreground.
    SkImageFilter::CropRect crop_rect(SkRect::MakeXYWH(0, 100, 200, 100));
    FilterOperations filters;
    filters.Append(FilterOperation::CreateReferenceFilter(
        sk_make_sp<ColorFilterPaintFilter>(
            SkColorFilter::MakeMatrixFilterRowMajor255(matrix), nullptr,
            &crop_rect)));

    // Make the foreground layer's render surface be clipped by the background
    // layer.
    background->SetMasksToBounds(true);
    foreground->SetFilters(filters);

    // Now move the filters origin up by 100 pixels, so the crop rect is
    // applied only to the top 100 pixels, not the bottom.
    foreground->SetFiltersOrigin(gfx::PointF(0.0f, -100.0f));

    RunPixelTest(test_type, background,
                 base::FilePath(FILE_PATH_LITERAL("blue_yellow.png")));
  }
};

TEST_F(ImageFilterNonZeroOriginPixelTest, ImageFilterNonZeroOrigin_GL) {
  RunPixelTestType(PIXEL_TEST_GL);
}

TEST_F(ImageFilterNonZeroOriginPixelTest, ImageFilterNonZeroOrigin_Software) {
  RunPixelTestType(PIXEL_TEST_SOFTWARE);
}

class ImageScaledBackdropFilter : public LayerTreeHostFiltersPixelTest {
 protected:
  void RunPixelTestType(PixelTestType test_type, base::FilePath image_name) {
    scoped_refptr<SolidColorLayer> background =
        CreateSolidColorLayer(gfx::Rect(200, 200), SK_ColorWHITE);

    gfx::Rect rect(50, 50, 100, 100);

    const int kInset = 3;
    for (int i = 0; !rect.IsEmpty(); ++i) {
      scoped_refptr<SolidColorLayer> layer =
          CreateSolidColorLayer(rect, (i & 1) ? SK_ColorWHITE : SK_ColorRED);

      gfx::Transform transform;
      transform.Translate(rect.width() / 2.0, rect.height() / 2.0);
      transform.RotateAboutZAxis(30.0);
      transform.Translate(-rect.width() / 2.0, -rect.height() / 2.0);
      layer->SetTransform(transform);

      background->AddChild(layer);

      rect.Inset(kInset, kInset);
    }

    scoped_refptr<SolidColorLayer> filter =
        CreateSolidColorLayer(gfx::Rect(100, 0, 100, 200), SK_ColorTRANSPARENT);

    background->AddChild(filter);

    // Apply a scale to |background| so that we can see any scaling artifacts
    // that may appear.
    gfx::Transform background_transform;
    static float scale = 1.1f;
    background_transform.Scale(scale, scale);
    background->SetTransform(background_transform);

    FilterOperations filters;
    filters.Append(FilterOperation::CreateGrayscaleFilter(1.0f));
    filter->SetBackdropFilters(filters);
    filter->SetBackdropFilterBounds(gfx::RectF());

#if defined(OS_WIN) || defined(_MIPS_ARCH_LOONGSON) || defined(ARCH_CPU_ARM64)
#if defined(OS_WIN)
    // Windows has 153 pixels off by at most 2: crbug.com/225027
    float percentage_pixels_large_error = 0.3825f;  // 153px / (200*200)
    int large_error_allowed = 2;
#elif defined(_MIPS_ARCH_LOONGSON)
    // Loongson has 2 pixels off by at most 2: crbug.com/819075
    float percentage_pixels_large_error = 0.005f;  // 2px / (200*200)
    int large_error_allowed = 2;
#else
    float percentage_pixels_large_error = 0.0325f;  // 13px / (200*200)
    int large_error_allowed = 1;
#endif
    float percentage_pixels_small_error = 0.0f;
    float average_error_allowed_in_bad_pixels = 1.f;
    int small_error_allowed = 0;
    pixel_comparator_.reset(new FuzzyPixelComparator(
        true,  // discard_alpha
        percentage_pixels_large_error, percentage_pixels_small_error,
        average_error_allowed_in_bad_pixels, large_error_allowed,
        small_error_allowed));
#endif

    RunPixelTest(test_type, background, image_name);
  }
};

TEST_F(ImageScaledBackdropFilter, ImageFilterScaled_GL) {
  RunPixelTestType(PIXEL_TEST_GL,
                   base::FilePath(FILE_PATH_LITERAL(
                       "backdrop_filter_on_scaled_layer_gl.png")));
}

TEST_F(ImageScaledBackdropFilter, ImageFilterScaled_Software) {
  RunPixelTestType(PIXEL_TEST_SOFTWARE,
                   base::FilePath(FILE_PATH_LITERAL(
                       "backdrop_filter_on_scaled_layer_sw.png")));
}

class ImageBackdropFilter : public LayerTreeHostFiltersPixelTest {
 protected:
  void RunPixelTestType(PixelTestType test_type, base::FilePath image_name) {
    // Add a white background with a rotated red rect in the center.
    scoped_refptr<SolidColorLayer> background =
        CreateSolidColorLayer(gfx::Rect(200, 200), SK_ColorWHITE);

    gfx::Rect rect(50, 50, 100, 100);

    scoped_refptr<SolidColorLayer> layer =
        CreateSolidColorLayer(rect, SK_ColorRED);

    gfx::Transform transform;
    transform.Translate(rect.width() / 2.0, rect.height() / 2.0);
    transform.RotateAboutZAxis(30.0);
    transform.Translate(-rect.width() / 2.0, -rect.height() / 2.0);
    layer->SetTransform(transform);

    background->AddChild(layer);

    // Add a slightly transparent blue layer.
    SkColor transparent_blue = SkColorSetARGB(0x23, 0x00, 0x00, 0xFF);
    scoped_refptr<SolidColorLayer> filter_layer =
        CreateSolidColorLayer(gfx::Rect(100, 0, 100, 200), transparent_blue);

    // Add some rotation so that we can see that it blurs only under the layer.
    gfx::Transform transform_filter;
    transform_filter.RotateAboutZAxis(10.0);
    filter_layer->SetTransform(transform_filter);

    // Add a blur filter to the blue layer.
    FilterOperations filters;
    filters.Append(FilterOperation::CreateBlurFilter(
        5.0f, SkBlurImageFilter::kClamp_TileMode));
    filter_layer->SetBackdropFilters(filters);
    // TODO(916311): Adding filter bounds here should work, but it clips
    // the corner of the red box.
    // gfx::RectF backdrop_filter_bounds(gfx::SizeF(filter_layer->bounds()));
    gfx::RectF backdrop_filter_bounds;
    filter_layer->SetBackdropFilterBounds(backdrop_filter_bounds);

    background->AddChild(filter_layer);

    // Allow some fuzziness so that this doesn't fail when Skia makes minor
    // changes to blur or rectangle rendering.
    float percentage_pixels_large_error = 4.f;
    float percentage_pixels_small_error = 0.0f;
    float average_error_allowed_in_bad_pixels = 2.f;
    int large_error_allowed = 2;
    int small_error_allowed = 0;
    pixel_comparator_.reset(new FuzzyPixelComparator(
        true,  // discard_alpha
        percentage_pixels_large_error, percentage_pixels_small_error,
        average_error_allowed_in_bad_pixels, large_error_allowed,
        small_error_allowed));

    RunPixelTest(test_type, background, image_name);
  }
};

TEST_F(ImageBackdropFilter, BackdropFilterRotated_GL) {
  RunPixelTestType(
      PIXEL_TEST_GL,
      base::FilePath(FILE_PATH_LITERAL("backdrop_filter_rotated_gl.png")));
}

TEST_F(ImageBackdropFilter, BackdropFilterRotated_Software) {
  RunPixelTestType(
      PIXEL_TEST_SOFTWARE,
      base::FilePath(FILE_PATH_LITERAL("backdrop_filter_rotated_sw.png")));
}

class ImageScaledRenderSurface : public LayerTreeHostFiltersPixelTest {
 protected:
  void RunPixelTestType(PixelTestType test_type, base::FilePath image_name) {
    // A filter will cause a render surface to be used.  Here we force the
    // render surface on, and scale the result to make sure that we rasterize at
    // the correct resolution.
    scoped_refptr<SolidColorLayer> background =
        CreateSolidColorLayer(gfx::Rect(300, 300), SK_ColorBLUE);

    scoped_refptr<SolidColorLayer> render_surface_layer =
        CreateSolidColorLayer(gfx::Rect(0, 0, 200, 200), SK_ColorWHITE);

    gfx::Rect rect(50, 50, 100, 100);

    scoped_refptr<SolidColorLayer> child =
        CreateSolidColorLayer(rect, SK_ColorRED);

    gfx::Transform transform;
    transform.Translate(rect.width() / 2.0, rect.height() / 2.0);
    transform.RotateAboutZAxis(30.0);
    transform.Translate(-rect.width() / 2.0, -rect.height() / 2.0);
    child->SetTransform(transform);

    render_surface_layer->AddChild(child);

    gfx::Transform render_surface_transform;
    render_surface_transform.Scale(1.5f, 1.5f);
    render_surface_layer->SetTransform(render_surface_transform);
    render_surface_layer->SetForceRenderSurfaceForTesting(true);

    background->AddChild(render_surface_layer);

    // Software has some huge differences in the AA'd pixels on the different
    // trybots. See crbug.com/452198.
    float percentage_pixels_large_error = 0.686f;
    float percentage_pixels_small_error = 0.0f;
    float average_error_allowed_in_bad_pixels = 16.f;
    int large_error_allowed = 17;
    int small_error_allowed = 0;
    pixel_comparator_.reset(new FuzzyPixelComparator(
        true,  // discard_alpha
        percentage_pixels_large_error, percentage_pixels_small_error,
        average_error_allowed_in_bad_pixels, large_error_allowed,
        small_error_allowed));

    RunPixelTest(test_type, background, image_name);
  }
};

TEST_F(ImageScaledRenderSurface, ImageRenderSurfaceScaled_GL) {
  RunPixelTestType(
      PIXEL_TEST_GL,
      base::FilePath(FILE_PATH_LITERAL("scaled_render_surface_layer_gl.png")));
}

TEST_F(ImageScaledRenderSurface, ImageRenderSurfaceScaled_Software) {
  RunPixelTestType(
      PIXEL_TEST_SOFTWARE,
      base::FilePath(FILE_PATH_LITERAL("scaled_render_surface_layer_sw.png")));
}

class ZoomFilterTest : public LayerTreeHostFiltersPixelTest {
 protected:
  void RunPixelTestType(PixelTestType test_type, base::FilePath image_name) {
    scoped_refptr<SolidColorLayer> root =
        CreateSolidColorLayer(gfx::Rect(300, 300), SK_ColorWHITE);

    // Create the pattern. Two blue/yellow side by side blocks with a horizontal
    // green strip.
    scoped_refptr<SolidColorLayer> left =
        CreateSolidColorLayer(gfx::Rect(0, 0, 100, 150), SK_ColorBLUE);
    root->AddChild(left);
    scoped_refptr<SolidColorLayer> right =
        CreateSolidColorLayer(gfx::Rect(100, 0, 200, 150), SK_ColorYELLOW);
    root->AddChild(right);
    scoped_refptr<SolidColorLayer> horizontal_strip =
        CreateSolidColorLayer(gfx::Rect(0, 10, 300, 10), SK_ColorGREEN);
    root->AddChild(horizontal_strip);

    // Test a zoom that extends past the edge of the screen.
    scoped_refptr<SolidColorLayer> border_edge_zoom =
        CreateSolidColorLayer(gfx::Rect(-10, -10, 50, 50), SK_ColorTRANSPARENT);
    FilterOperations border_filters;
    border_filters.Append(
        FilterOperation::CreateZoomFilter(2.f /* zoom */, 0 /* inset */));
    border_edge_zoom->SetBackdropFilters(border_filters);
    gfx::RectF border_filter_bounds(gfx::SizeF(border_edge_zoom->bounds()));
    border_edge_zoom->SetBackdropFilterBounds(border_filter_bounds);
    root->AddChild(border_edge_zoom);

    // Test a zoom that extends past the edge of the screen.
    scoped_refptr<SolidColorLayer> top_edge_zoom =
        CreateSolidColorLayer(gfx::Rect(70, -10, 50, 50), SK_ColorTRANSPARENT);
    FilterOperations top_filters;
    top_filters.Append(
        FilterOperation::CreateZoomFilter(2.f /* zoom */, 0 /* inset */));
    top_edge_zoom->SetBackdropFilters(top_filters);
    gfx::RectF top_filter_bounds(gfx::SizeF(top_edge_zoom->bounds()));
    top_edge_zoom->SetBackdropFilterBounds(top_filter_bounds);
    root->AddChild(top_edge_zoom);

    // Test a zoom that is fully within the screen.
    scoped_refptr<SolidColorLayer> contained_zoom =
        CreateSolidColorLayer(gfx::Rect(150, 5, 50, 50), SK_ColorTRANSPARENT);
    FilterOperations mid_filters;
    mid_filters.Append(
        FilterOperation::CreateZoomFilter(2.f /* zoom */, 0 /* inset */));
    contained_zoom->SetBackdropFilters(mid_filters);
    gfx::RectF mid_filter_bounds(gfx::SizeF(contained_zoom->bounds()));
    contained_zoom->SetBackdropFilterBounds(mid_filter_bounds);
    root->AddChild(contained_zoom);

#if defined(OS_WIN)
    // Windows has 1 pixel off by 1: crbug.com/259915
    float percentage_pixels_large_error = 0.00111112f;  // 1px / (300*300)
    float percentage_pixels_small_error = 0.0f;
    float average_error_allowed_in_bad_pixels = 1.f;
    int large_error_allowed = 1;
    int small_error_allowed = 0;
    pixel_comparator_.reset(new FuzzyPixelComparator(
        true,  // discard_alpha
        percentage_pixels_large_error, percentage_pixels_small_error,
        average_error_allowed_in_bad_pixels, large_error_allowed,
        small_error_allowed));
#endif

    RunPixelTest(test_type, std::move(root), image_name);
  }
};

TEST_F(ZoomFilterTest, ZoomFilterTest_GL) {
  RunPixelTestType(PIXEL_TEST_GL,
                   base::FilePath(FILE_PATH_LITERAL("zoom_filter_gl.png")));
}

TEST_F(ZoomFilterTest, ZoomFilterTest_Software) {
  RunPixelTestType(PIXEL_TEST_SOFTWARE,
                   base::FilePath(FILE_PATH_LITERAL("zoom_filter_sw.png")));
}

class RotatedFilterTest : public LayerTreeHostFiltersPixelTest {
 protected:
  void RunPixelTestType(PixelTestType test_type, base::FilePath image_name) {
    scoped_refptr<SolidColorLayer> background =
        CreateSolidColorLayer(gfx::Rect(300, 300), SK_ColorWHITE);

    gfx::Rect rect(50, 50, 100, 100);

    scoped_refptr<SolidColorLayer> child =
        CreateSolidColorLayer(rect, SK_ColorBLUE);

    gfx::Transform transform;
    transform.Translate(50.0f, 50.0f);
    transform.RotateAboutZAxis(1.0);
    transform.Translate(-50.0f, -50.0f);
    child->SetTransform(transform);
    FilterOperations filters;
    // We need a clamping brightness filter here to force the Skia filter path.
    filters.Append(FilterOperation::CreateBrightnessFilter(1.1f));
    filters.Append(FilterOperation::CreateGrayscaleFilter(1.0f));
    child->SetFilters(filters);

    background->AddChild(child);

#if defined(OS_WIN)
    // Windows has 1 pixel off by 1: crbug.com/259915
    float percentage_pixels_large_error = 0.00111112f;  // 1px / (300*300)
    float percentage_pixels_small_error = 0.0f;
    float average_error_allowed_in_bad_pixels = 1.f;
    int large_error_allowed = 1;
    int small_error_allowed = 0;
    pixel_comparator_.reset(new FuzzyPixelComparator(
        true,  // discard_alpha
        percentage_pixels_large_error, percentage_pixels_small_error,
        average_error_allowed_in_bad_pixels, large_error_allowed,
        small_error_allowed));
#endif

    RunPixelTest(test_type, background, image_name);
  }
};

TEST_F(RotatedFilterTest, RotatedFilterTest_GL) {
  RunPixelTestType(PIXEL_TEST_GL,
                   base::FilePath(FILE_PATH_LITERAL("rotated_filter_gl.png")));
}

TEST_F(RotatedFilterTest, RotatedFilterTest_Software) {
  RunPixelTestType(PIXEL_TEST_SOFTWARE,
                   base::FilePath(FILE_PATH_LITERAL("rotated_filter_sw.png")));
}

class RotatedDropShadowFilterTest : public LayerTreeHostFiltersPixelTest {
 protected:
  void RunPixelTestType(PixelTestType test_type, base::FilePath image_name) {
    scoped_refptr<SolidColorLayer> background =
        CreateSolidColorLayer(gfx::Rect(300, 300), SK_ColorWHITE);

    gfx::Rect rect(50, 50, 100, 100);

    // Use a border to defeat solid color detection to force a tile quad.
    // This is intended to test render pass removal optimizations.
    SolidColorContentLayerClient blue_client(SK_ColorBLUE, rect.size(), 1,
                                             SK_ColorBLACK);
    scoped_refptr<PictureLayer> child = PictureLayer::Create(&blue_client);
    child->SetBounds(rect.size());
    child->SetPosition(gfx::PointF(rect.origin()));
    child->SetIsDrawable(true);

    gfx::Transform transform;
    transform.Translate(50.0f, 50.0f);
    transform.RotateAboutZAxis(1.0);
    transform.Translate(-50.0f, -50.0f);
    child->SetTransform(transform);
    FilterOperations filters;
    filters.Append(FilterOperation::CreateDropShadowFilter(
        gfx::Point(10.0f, 10.0f), 0.0f, SK_ColorBLACK));
    child->SetFilters(filters);

    background->AddChild(child);

#if defined(OS_WIN) || defined(ARCH_CPU_ARM64)
    // Windows and ARM64 have 3 pixels off by 1: crbug.com/259915
    float percentage_pixels_large_error = 0.00333334f;  // 3px / (300*300)
    float percentage_pixels_small_error = 0.0f;
    float average_error_allowed_in_bad_pixels = 1.f;
    int large_error_allowed = 1;
    int small_error_allowed = 0;
    pixel_comparator_.reset(new FuzzyPixelComparator(
        true,  // discard_alpha
        percentage_pixels_large_error, percentage_pixels_small_error,
        average_error_allowed_in_bad_pixels, large_error_allowed,
        small_error_allowed));
#endif

    RunPixelTest(test_type, background, image_name);
  }
};

TEST_F(RotatedDropShadowFilterTest, RotatedDropShadowFilterTest_GL) {
  RunPixelTestType(
      PIXEL_TEST_GL,
      base::FilePath(FILE_PATH_LITERAL("rotated_drop_shadow_filter_gl.png")));
}

TEST_F(RotatedDropShadowFilterTest, RotatedDropShadowFilterTest_Software) {
  RunPixelTestType(
      PIXEL_TEST_SOFTWARE,
      base::FilePath(FILE_PATH_LITERAL("rotated_drop_shadow_filter_sw.png")));
}

class TranslatedFilterTest : public LayerTreeHostFiltersPixelTest {
 protected:
  void RunPixelTestType(PixelTestType test_type, base::FilePath image_name) {
    scoped_refptr<Layer> clip = Layer::Create();
    clip->SetBounds(gfx::Size(300, 300));
    clip->SetMasksToBounds(true);

    scoped_refptr<Layer> parent = Layer::Create();
    parent->SetPosition(gfx::PointF(30.f, 30.f));

    gfx::Rect child_rect(100, 100);
    // Use two colors to bypass solid color detection, so we get a tile quad.
    // This is intended to test render pass removal optimizations.
    FakeContentLayerClient client;
    client.set_bounds(child_rect.size());
    PaintFlags flags;
    flags.setColor(SK_ColorGREEN);
    client.add_draw_rect(child_rect, flags);
    flags.setColor(SK_ColorBLUE);
    client.add_draw_rect(gfx::Rect(100, 50), flags);
    scoped_refptr<PictureLayer> child = PictureLayer::Create(&client);
    child->SetBounds(child_rect.size());
    child->SetIsDrawable(true);
    FilterOperations filters;
    filters.Append(FilterOperation::CreateOpacityFilter(0.5f));
    child->SetFilters(filters);

    // This layer will be clipped by |clip|, so the RenderPass created for
    // |child| will only have one visible quad.
    scoped_refptr<SolidColorLayer> grand_child =
        CreateSolidColorLayer(gfx::Rect(-300, -300, 100, 100), SK_ColorRED);

    child->AddChild(grand_child);
    parent->AddChild(child);
    clip->AddChild(parent);

    RunPixelTest(test_type, clip, image_name);
  }
};

TEST_F(TranslatedFilterTest, GL) {
  RunPixelTestType(
      PIXEL_TEST_GL,
      base::FilePath(FILE_PATH_LITERAL("translated_blue_green_alpha_gl.png")));
}

TEST_F(TranslatedFilterTest, Software) {
  RunPixelTestType(
      PIXEL_TEST_SOFTWARE,
      base::FilePath(FILE_PATH_LITERAL("translated_blue_green_alpha_sw.png")));
}

class EnlargedTextureWithAlphaThresholdFilter
    : public LayerTreeHostFiltersPixelTest {
 protected:
  void RunPixelTestType(PixelTestType test_type, base::FilePath image_name) {
    // Rectangles choosen so that if flipped, the test will fail.
    gfx::Rect rect1(10, 10, 10, 15);
    gfx::Rect rect2(20, 25, 70, 65);

    scoped_refptr<SolidColorLayer> child1 =
        CreateSolidColorLayer(rect1, SK_ColorRED);
    scoped_refptr<SolidColorLayer> child2 =
        CreateSolidColorLayer(rect2, SK_ColorGREEN);
    scoped_refptr<SolidColorLayer> background =
        CreateSolidColorLayer(gfx::Rect(200, 200), SK_ColorBLUE);
    scoped_refptr<SolidColorLayer> filter_layer =
        CreateSolidColorLayer(gfx::Rect(100, 100), SK_ColorWHITE);

    // Make sure a transformation does not cause misregistration of the filter
    // and source texture.
    gfx::Transform filter_transform;
    filter_transform.Scale(2.f, 2.f);
    filter_layer->SetTransform(filter_transform);
    filter_layer->AddChild(child1);
    filter_layer->AddChild(child2);

    rect1.Inset(-5, -5);
    rect2.Inset(-5, -5);
    FilterOperation::ShapeRects alpha_shape = {rect1, rect2};
    FilterOperations filters;
    filters.Append(
        FilterOperation::CreateAlphaThresholdFilter(alpha_shape, 0.f, 0.f));
    filter_layer->SetFilters(filters);

    background->AddChild(filter_layer);

    // Force the allocation a larger textures.
    set_enlarge_texture_amount(gfx::Size(50, 50));

    RunPixelTest(test_type, background, image_name);
  }
};

TEST_F(EnlargedTextureWithAlphaThresholdFilter, GL) {
  RunPixelTestType(
      PIXEL_TEST_GL,
      base::FilePath(FILE_PATH_LITERAL("enlarged_texture_on_threshold.png")));
}

TEST_F(EnlargedTextureWithAlphaThresholdFilter, Software) {
  RunPixelTestType(
      PIXEL_TEST_SOFTWARE,
      base::FilePath(FILE_PATH_LITERAL("enlarged_texture_on_threshold.png")));
}

class EnlargedTextureWithCropOffsetFilter
    : public LayerTreeHostFiltersPixelTest {
 protected:
  void RunPixelTestType(PixelTestType test_type, base::FilePath image_name) {
    // Rectangles choosen so that if flipped, the test will fail.
    gfx::Rect rect1(10, 10, 10, 15);
    gfx::Rect rect2(20, 25, 70, 65);

    scoped_refptr<SolidColorLayer> child1 =
        CreateSolidColorLayer(rect1, SK_ColorRED);
    scoped_refptr<SolidColorLayer> child2 =
        CreateSolidColorLayer(rect2, SK_ColorGREEN);
    scoped_refptr<SolidColorLayer> background =
        CreateSolidColorLayer(gfx::Rect(200, 200), SK_ColorBLUE);
    scoped_refptr<SolidColorLayer> filter_layer =
        CreateSolidColorLayer(gfx::Rect(100, 100), SK_ColorWHITE);

    // Make sure a transformation does not cause misregistration of the filter
    // and source texture.
    gfx::Transform filter_transform;
    filter_transform.Scale(2.f, 2.f);
    filter_layer->SetTransform(filter_transform);
    filter_layer->AddChild(child1);
    filter_layer->AddChild(child2);

    FilterOperations filters;
    SkImageFilter::CropRect cropRect(SkRect::MakeXYWH(10, 10, 80, 80));
    filters.Append(FilterOperation::CreateReferenceFilter(
        sk_make_sp<OffsetPaintFilter>(0, 0, nullptr, &cropRect)));
    filter_layer->SetFilters(filters);

    background->AddChild(filter_layer);

    // Force the allocation a larger textures.
    set_enlarge_texture_amount(gfx::Size(50, 50));

    RunPixelTest(test_type, background, image_name);
  }
};

TEST_F(EnlargedTextureWithCropOffsetFilter, GL) {
  RunPixelTestType(
      PIXEL_TEST_GL,
      base::FilePath(FILE_PATH_LITERAL("enlarged_texture_on_crop_offset.png")));
}

TEST_F(EnlargedTextureWithCropOffsetFilter, Software) {
  RunPixelTestType(
      PIXEL_TEST_SOFTWARE,
      base::FilePath(FILE_PATH_LITERAL("enlarged_texture_on_crop_offset.png")));
}

class BlurFilterWithClip : public LayerTreeHostFiltersPixelTest {
 protected:
  void RunPixelTestType(PixelTestType test_type, base::FilePath image_name) {
    scoped_refptr<SolidColorLayer> child1 =
        CreateSolidColorLayer(gfx::Rect(200, 200), SK_ColorBLUE);
    scoped_refptr<SolidColorLayer> child2 =
        CreateSolidColorLayer(gfx::Rect(20, 20, 160, 160), SK_ColorWHITE);
    scoped_refptr<SolidColorLayer> child3 =
        CreateSolidColorLayer(gfx::Rect(40, 40, 20, 30), SK_ColorRED);
    scoped_refptr<SolidColorLayer> child4 =
        CreateSolidColorLayer(gfx::Rect(60, 70, 100, 90), SK_ColorGREEN);
    scoped_refptr<SolidColorLayer> filter_layer =
        CreateSolidColorLayer(gfx::Rect(200, 200), SK_ColorWHITE);

    filter_layer->AddChild(child1);
    filter_layer->AddChild(child2);
    filter_layer->AddChild(child3);
    filter_layer->AddChild(child4);

    FilterOperations filters;
    filters.Append(FilterOperation::CreateBlurFilter(
        2.f, SkBlurImageFilter::kClamp_TileMode));
    filter_layer->SetFilters(filters);

    // Force the allocation a larger textures.
    set_enlarge_texture_amount(gfx::Size(50, 50));

#if defined(OS_WIN) || defined(ARCH_CPU_ARM64)
#if defined(OS_WIN)
    // Windows has 1880 pixels off by 1: crbug.com/259915
    float percentage_pixels_large_error = 4.7f;  // 1880px / (200*200)
#else
    // Differences in floating point calculation on ARM means a small percentage
    // of pixels will have small differences.
    float percentage_pixels_large_error = 2.76f;  // 1104px / (200*200)
#endif
    float percentage_pixels_small_error = 0.0f;
    float average_error_allowed_in_bad_pixels = 1.f;
    int large_error_allowed = 2;
    int small_error_allowed = 0;
    pixel_comparator_.reset(new FuzzyPixelComparator(
        true,  // discard_alpha
        percentage_pixels_large_error, percentage_pixels_small_error,
        average_error_allowed_in_bad_pixels, large_error_allowed,
        small_error_allowed));
#endif

    RunPixelTest(test_type, filter_layer, image_name);
  }
};

TEST_F(BlurFilterWithClip, GL) {
  RunPixelTestType(
      PIXEL_TEST_GL,
      base::FilePath(FILE_PATH_LITERAL("blur_filter_with_clip_gl.png")));
}

TEST_F(BlurFilterWithClip, Software) {
  RunPixelTestType(
      PIXEL_TEST_SOFTWARE,
      base::FilePath(FILE_PATH_LITERAL("blur_filter_with_clip_sw.png")));
}

class FilterWithGiantCropRectPixelTest : public LayerTreeHostFiltersPixelTest {
 protected:
  scoped_refptr<SolidColorLayer> BuildFilterWithGiantCropRect(
      bool masks_to_bounds) {
    scoped_refptr<SolidColorLayer> background =
        CreateSolidColorLayer(gfx::Rect(200, 200), SK_ColorWHITE);
    scoped_refptr<SolidColorLayer> filter_layer =
        CreateSolidColorLayer(gfx::Rect(50, 50, 100, 100), SK_ColorRED);

    // This matrix swaps the red and green channels, and has a slight
    // translation in the alpha component, so that it affects transparent
    // pixels.
    SkScalar matrix[20] = {
        0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f,
        0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 20.0f,
    };

    FilterOperations filters;
    SkImageFilter::CropRect cropRect(
        SkRect::MakeXYWH(-40000, -40000, 80000, 80000));
    filters.Append(FilterOperation::CreateReferenceFilter(
        sk_make_sp<ColorFilterPaintFilter>(
            SkColorFilter::MakeMatrixFilterRowMajor255(matrix), nullptr,
            &cropRect)));
    filter_layer->SetFilters(filters);
    background->SetMasksToBounds(masks_to_bounds);
    background->AddChild(filter_layer);

    return background;
  }
};

class FilterWithGiantCropRect : public FilterWithGiantCropRectPixelTest {
 protected:
  void RunPixelTestType(PixelTestType test_type, base::FilePath image_name) {
    scoped_refptr<SolidColorLayer> tree = BuildFilterWithGiantCropRect(true);
    RunPixelTest(test_type, tree, image_name);
  }
};

TEST_F(FilterWithGiantCropRect, GL) {
  RunPixelTestType(
      PIXEL_TEST_GL,
      base::FilePath(FILE_PATH_LITERAL("filter_with_giant_crop_rect.png")));
}

class FilterWithGiantCropRectNoClip : public FilterWithGiantCropRectPixelTest {
 protected:
  void RunPixelTestType(PixelTestType test_type, base::FilePath image_name) {
    scoped_refptr<SolidColorLayer> tree = BuildFilterWithGiantCropRect(false);
    RunPixelTest(test_type, tree, image_name);
  }
};

TEST_F(FilterWithGiantCropRectNoClip, GL) {
  RunPixelTestType(
      PIXEL_TEST_GL,
      base::FilePath(FILE_PATH_LITERAL("filter_with_giant_crop_rect.png")));
}

class BackdropFilterWithDeviceScaleFactorTest
    : public LayerTreeHostFiltersPixelTest {
 protected:
  void RunPixelTestType(float device_scale_factor,
                        PixelTestType test_type,
                        const base::FilePath& expected_result) {
    device_scale_factor_ = device_scale_factor;

    scoped_refptr<Layer> root =
        CreateSolidColorLayer(gfx::Rect(200, 200), SK_ColorWHITE);

    scoped_refptr<SolidColorLayer> background =
        CreateSolidColorLayer(gfx::Rect(100, 120), SK_ColorBLACK);
    root->AddChild(background);

    scoped_refptr<SolidColorLayer> filtered = CreateSolidColorLayer(
        gfx::Rect(0, 100, 200, 100), SkColorSetA(SK_ColorGREEN, 127));
    FilterOperations filters;
    filters.Append(FilterOperation::CreateReferenceFilter(
        sk_make_sp<OffsetPaintFilter>(0, 80, nullptr)));
    filtered->SetBackdropFilters(filters);
    filtered->SetBackdropFilterBounds(gfx::RectF());
    root->AddChild(filtered);

    // This should appear as a grid of 4 100x100 squares which are:
    // BLACK       WHITE
    // DARK GREEN  LIGHT GREEN
    RunPixelTest(test_type, std::move(root), expected_result);
  }

 private:
  // LayerTreePixelTest overrides

  void InitializeSettings(LayerTreeSettings* settings) override {
    LayerTreeHostFiltersPixelTest::InitializeSettings(settings);
    // Required so that device scale is inherited by content scale.
    settings->layer_transforms_should_scale_layer_contents = true;
  }

  void SetupTree() override {
    SetInitialDeviceScaleFactor(device_scale_factor_);
    LayerTreeHostFiltersPixelTest::SetupTree();
  }

  float device_scale_factor_ = 1;
};

TEST_F(BackdropFilterWithDeviceScaleFactorTest, StandardDpi_GL) {
  RunPixelTestType(
      1.f, PIXEL_TEST_GL,
      base::FilePath(FILE_PATH_LITERAL("offset_backdrop_filter_1x.png")));
}

TEST_F(BackdropFilterWithDeviceScaleFactorTest, StandardDpi_Software) {
  RunPixelTestType(
      1.f, PIXEL_TEST_SOFTWARE,
      base::FilePath(FILE_PATH_LITERAL("offset_backdrop_filter_1x.png")));
}

TEST_F(BackdropFilterWithDeviceScaleFactorTest, HiDpi_GL) {
  RunPixelTestType(
      2.f, PIXEL_TEST_GL,
      base::FilePath(FILE_PATH_LITERAL("offset_backdrop_filter_2x.png")));
}

TEST_F(BackdropFilterWithDeviceScaleFactorTest, HiDpi_Software) {
  RunPixelTestType(
      2.f, PIXEL_TEST_SOFTWARE,
      base::FilePath(FILE_PATH_LITERAL("offset_backdrop_filter_2x.png")));
}

}  // namespace
}  // namespace cc

#endif  // OS_ANDROID