cc/output/filter_operations_unittest.cc

// 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/output/filter_operations.h"
#include "skia/ext/refptr.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/skia/include/effects/SkBlurImageFilter.h"
#include "ui/gfx/geometry/point.h"

namespace cc {
namespace {

TEST(FilterOperationsTest, GetOutsetsBlur) {
  FilterOperations ops;
  ops.Append(FilterOperation::CreateBlurFilter(20));
  int top, right, bottom, left;
  top = right = bottom = left = 0;
  ops.GetOutsets(&top, &right, &bottom, &left);
  EXPECT_EQ(57, top);
  EXPECT_EQ(57, right);
  EXPECT_EQ(57, bottom);
  EXPECT_EQ(57, left);
}

TEST(FilterOperationsTest, GetOutsetsDropShadow) {
  FilterOperations ops;
  ops.Append(FilterOperation::CreateDropShadowFilter(gfx::Point(3, 8), 20, 0));
  int top, right, bottom, left;
  top = right = bottom = left = 0;
  ops.GetOutsets(&top, &right, &bottom, &left);
  EXPECT_EQ(49, top);
  EXPECT_EQ(60, right);
  EXPECT_EQ(65, bottom);
  EXPECT_EQ(54, left);
}

#define SAVE_RESTORE_AMOUNT(filter_name, filter_type, a)                  \
  {                                                                       \
    FilterOperation op = FilterOperation::Create##filter_name##Filter(a); \
    EXPECT_EQ(FilterOperation::filter_type, op.type());                   \
    EXPECT_EQ(a, op.amount());                                            \
                                                                          \
    FilterOperation op2 = FilterOperation::CreateEmptyFilter();           \
    op2.set_type(FilterOperation::filter_type);                           \
                                                                          \
    EXPECT_NE(a, op2.amount());                                           \
                                                                          \
    op2.set_amount(a);                                                    \
                                                                          \
    EXPECT_EQ(FilterOperation::filter_type, op2.type());                  \
    EXPECT_EQ(a, op2.amount());                                           \
  }

#define SAVE_RESTORE_OFFSET_AMOUNT_COLOR(filter_name, filter_type, a, b, c) \
  {                                                                         \
    FilterOperation op =                                                    \
        FilterOperation::Create##filter_name##Filter(a, b, c);              \
    EXPECT_EQ(FilterOperation::filter_type, op.type());                     \
    EXPECT_EQ(a, op.drop_shadow_offset());                                  \
    EXPECT_EQ(b, op.amount());                                              \
    EXPECT_EQ(c, op.drop_shadow_color());                                   \
                                                                            \
    FilterOperation op2 = FilterOperation::CreateEmptyFilter();             \
    op2.set_type(FilterOperation::filter_type);                             \
                                                                            \
    EXPECT_NE(a, op2.drop_shadow_offset());                                 \
    EXPECT_NE(b, op2.amount());                                             \
    EXPECT_NE(c, op2.drop_shadow_color());                                  \
                                                                            \
    op2.set_drop_shadow_offset(a);                                          \
    op2.set_amount(b);                                                      \
    op2.set_drop_shadow_color(c);                                           \
                                                                            \
    EXPECT_EQ(FilterOperation::filter_type, op2.type());                    \
    EXPECT_EQ(a, op2.drop_shadow_offset());                                 \
    EXPECT_EQ(b, op2.amount());                                             \
    EXPECT_EQ(c, op2.drop_shadow_color());                                  \
  }

#define SAVE_RESTORE_MATRIX(filter_name, filter_type, a)                  \
  {                                                                       \
    FilterOperation op = FilterOperation::Create##filter_name##Filter(a); \
    EXPECT_EQ(FilterOperation::filter_type, op.type());                   \
    for (size_t i = 0; i < 20; ++i)                                       \
      EXPECT_EQ(a[i], op.matrix()[i]);                                    \
                                                                          \
    FilterOperation op2 = FilterOperation::CreateEmptyFilter();           \
    op2.set_type(FilterOperation::filter_type);                           \
                                                                          \
    for (size_t i = 0; i < 20; ++i)                                       \
      EXPECT_NE(a[i], op2.matrix()[i]);                                   \
                                                                          \
    op2.set_matrix(a);                                                    \
                                                                          \
    EXPECT_EQ(FilterOperation::filter_type, op2.type());                  \
    for (size_t i = 0; i < 20; ++i)                                       \
      EXPECT_EQ(a[i], op.matrix()[i]);                                    \
  }

#define SAVE_RESTORE_AMOUNT_INSET(filter_name, filter_type, a, b)            \
  {                                                                          \
    FilterOperation op = FilterOperation::Create##filter_name##Filter(a, b); \
    EXPECT_EQ(FilterOperation::filter_type, op.type());                      \
    EXPECT_EQ(a, op.amount());                                               \
    EXPECT_EQ(b, op.zoom_inset());                                           \
                                                                             \
    FilterOperation op2 = FilterOperation::CreateEmptyFilter();              \
    op2.set_type(FilterOperation::filter_type);                              \
                                                                             \
    EXPECT_NE(a, op2.amount());                                              \
    EXPECT_NE(b, op2.zoom_inset());                                          \
                                                                             \
    op2.set_amount(a);                                                       \
    op2.set_zoom_inset(b);                                                   \
                                                                             \
    EXPECT_EQ(FilterOperation::filter_type, op2.type());                     \
    EXPECT_EQ(a, op2.amount());                                              \
    EXPECT_EQ(b, op2.zoom_inset());                                          \
  }

TEST(FilterOperationsTest, SaveAndRestore) {
  SAVE_RESTORE_AMOUNT(Grayscale, GRAYSCALE, 0.6f);
  SAVE_RESTORE_AMOUNT(Sepia, SEPIA, 0.6f);
  SAVE_RESTORE_AMOUNT(Saturate, SATURATE, 0.6f);
  SAVE_RESTORE_AMOUNT(HueRotate, HUE_ROTATE, 0.6f);
  SAVE_RESTORE_AMOUNT(Invert, INVERT, 0.6f);
  SAVE_RESTORE_AMOUNT(Brightness, BRIGHTNESS, 0.6f);
  SAVE_RESTORE_AMOUNT(Contrast, CONTRAST, 0.6f);
  SAVE_RESTORE_AMOUNT(Opacity, OPACITY, 0.6f);
  SAVE_RESTORE_AMOUNT(Blur, BLUR, 0.6f);
  SAVE_RESTORE_AMOUNT(SaturatingBrightness, SATURATING_BRIGHTNESS, 0.6f);
  SAVE_RESTORE_OFFSET_AMOUNT_COLOR(
      DropShadow, DROP_SHADOW, gfx::Point(3, 4), 0.4f, 0xffffff00);

  SkScalar matrix[20] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,
                         17, 18, 19, 20};
  SAVE_RESTORE_MATRIX(ColorMatrix, COLOR_MATRIX, matrix);

  SAVE_RESTORE_AMOUNT_INSET(Zoom, ZOOM, 0.5f, 32);
}

TEST(FilterOperationsTest, BlendGrayscaleFilters) {
  FilterOperation from = FilterOperation::CreateGrayscaleFilter(0.25f);
  FilterOperation to = FilterOperation::CreateGrayscaleFilter(0.75f);

  FilterOperation blended = FilterOperation::Blend(&from, &to, -0.75);
  FilterOperation expected = FilterOperation::CreateGrayscaleFilter(0.f);
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(&from, &to, 0.75);
  expected = FilterOperation::CreateGrayscaleFilter(0.625f);
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(&from, &to, 1.8);
  expected = FilterOperation::CreateGrayscaleFilter(1.f);
  EXPECT_EQ(expected, blended);
}

TEST(FilterOperationsTest, BlendGrayscaleWithNull) {
  FilterOperation filter = FilterOperation::CreateGrayscaleFilter(1.f);

  FilterOperation blended = FilterOperation::Blend(&filter, NULL, 0.25);
  FilterOperation expected = FilterOperation::CreateGrayscaleFilter(0.75f);
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(NULL, &filter, 0.25);
  expected = FilterOperation::CreateGrayscaleFilter(0.25f);
  EXPECT_EQ(expected, blended);
}

TEST(FilterOperationsTest, BlendSepiaFilters) {
  FilterOperation from = FilterOperation::CreateSepiaFilter(0.25f);
  FilterOperation to = FilterOperation::CreateSepiaFilter(0.75f);

  FilterOperation blended = FilterOperation::Blend(&from, &to, -0.75);
  FilterOperation expected = FilterOperation::CreateSepiaFilter(0.f);
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(&from, &to, 0.75);
  expected = FilterOperation::CreateSepiaFilter(0.625f);
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(&from, &to, 1.8);
  expected = FilterOperation::CreateSepiaFilter(1.f);
  EXPECT_EQ(expected, blended);
}

TEST(FilterOperationsTest, BlendSepiaWithNull) {
  FilterOperation filter = FilterOperation::CreateSepiaFilter(1.f);

  FilterOperation blended = FilterOperation::Blend(&filter, NULL, 0.25);
  FilterOperation expected = FilterOperation::CreateSepiaFilter(0.75f);
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(NULL, &filter, 0.25);
  expected = FilterOperation::CreateSepiaFilter(0.25f);
  EXPECT_EQ(expected, blended);
}

TEST(FilterOperationsTest, BlendSaturateFilters) {
  FilterOperation from = FilterOperation::CreateSaturateFilter(0.25f);
  FilterOperation to = FilterOperation::CreateSaturateFilter(0.75f);

  FilterOperation blended = FilterOperation::Blend(&from, &to, -0.75);
  FilterOperation expected = FilterOperation::CreateSaturateFilter(0.f);
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(&from, &to, 0.75);
  expected = FilterOperation::CreateSaturateFilter(0.625f);
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(&from, &to, 2.0);
  expected = FilterOperation::CreateSaturateFilter(1.25f);
  EXPECT_EQ(expected, blended);
}

TEST(FilterOperationsTest, BlendSaturateWithNull) {
  FilterOperation filter = FilterOperation::CreateSaturateFilter(0.f);

  FilterOperation blended = FilterOperation::Blend(&filter, NULL, 0.25);
  FilterOperation expected = FilterOperation::CreateSaturateFilter(0.25f);
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(NULL, &filter, 0.25);
  expected = FilterOperation::CreateSaturateFilter(0.75f);
  EXPECT_EQ(expected, blended);
}

TEST(FilterOperationsTest, BlendHueRotateFilters) {
  FilterOperation from = FilterOperation::CreateHueRotateFilter(3.f);
  FilterOperation to = FilterOperation::CreateHueRotateFilter(7.f);

  FilterOperation blended = FilterOperation::Blend(&from, &to, -0.75);
  FilterOperation expected = FilterOperation::CreateHueRotateFilter(0.f);
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(&from, &to, 0.75);
  expected = FilterOperation::CreateHueRotateFilter(6.f);
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(&from, &to, 1.5);
  expected = FilterOperation::CreateHueRotateFilter(9.f);
  EXPECT_EQ(expected, blended);
}

TEST(FilterOperationsTest, BlendHueRotateWithNull) {
  FilterOperation filter = FilterOperation::CreateHueRotateFilter(1.f);

  FilterOperation blended = FilterOperation::Blend(&filter, NULL, 0.25);
  FilterOperation expected = FilterOperation::CreateHueRotateFilter(0.75f);
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(NULL, &filter, 0.25);
  expected = FilterOperation::CreateHueRotateFilter(0.25f);
  EXPECT_EQ(expected, blended);
}

TEST(FilterOperationsTest, BlendInvertFilters) {
  FilterOperation from = FilterOperation::CreateInvertFilter(0.25f);
  FilterOperation to = FilterOperation::CreateInvertFilter(0.75f);

  FilterOperation blended = FilterOperation::Blend(&from, &to, -0.75);
  FilterOperation expected = FilterOperation::CreateInvertFilter(0.f);
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(&from, &to, 0.75);
  expected = FilterOperation::CreateInvertFilter(0.625f);
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(&from, &to, 1.8);
  expected = FilterOperation::CreateInvertFilter(1.f);
  EXPECT_EQ(expected, blended);
}

TEST(FilterOperationsTest, BlendInvertWithNull) {
  FilterOperation filter = FilterOperation::CreateInvertFilter(1.f);

  FilterOperation blended = FilterOperation::Blend(&filter, NULL, 0.25);
  FilterOperation expected = FilterOperation::CreateInvertFilter(0.75f);
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(NULL, &filter, 0.25);
  expected = FilterOperation::CreateInvertFilter(0.25f);
  EXPECT_EQ(expected, blended);
}

TEST(FilterOperationsTest, BlendBrightnessFilters) {
  FilterOperation from = FilterOperation::CreateBrightnessFilter(3.f);
  FilterOperation to = FilterOperation::CreateBrightnessFilter(7.f);

  FilterOperation blended = FilterOperation::Blend(&from, &to, -0.9);
  FilterOperation expected = FilterOperation::CreateBrightnessFilter(0.f);
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(&from, &to, 0.75);
  expected = FilterOperation::CreateBrightnessFilter(6.f);
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(&from, &to, 1.5);
  expected = FilterOperation::CreateBrightnessFilter(9.f);
  EXPECT_EQ(expected, blended);
}

TEST(FilterOperationsTest, BlendBrightnessWithNull) {
  FilterOperation filter = FilterOperation::CreateBrightnessFilter(0.f);

  FilterOperation blended = FilterOperation::Blend(&filter, NULL, 0.25);
  FilterOperation expected = FilterOperation::CreateBrightnessFilter(0.25f);
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(NULL, &filter, 0.25);
  expected = FilterOperation::CreateBrightnessFilter(0.75f);
  EXPECT_EQ(expected, blended);
}

TEST(FilterOperationsTest, BlendContrastFilters) {
  FilterOperation from = FilterOperation::CreateContrastFilter(3.f);
  FilterOperation to = FilterOperation::CreateContrastFilter(7.f);

  FilterOperation blended = FilterOperation::Blend(&from, &to, -0.9);
  FilterOperation expected = FilterOperation::CreateContrastFilter(0.f);
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(&from, &to, 0.75);
  expected = FilterOperation::CreateContrastFilter(6.f);
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(&from, &to, 1.5);
  expected = FilterOperation::CreateContrastFilter(9.f);
  EXPECT_EQ(expected, blended);
}

TEST(FilterOperationsTest, BlendContrastWithNull) {
  FilterOperation filter = FilterOperation::CreateContrastFilter(0.f);

  FilterOperation blended = FilterOperation::Blend(&filter, NULL, 0.25);
  FilterOperation expected = FilterOperation::CreateContrastFilter(0.25f);
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(NULL, &filter, 0.25);
  expected = FilterOperation::CreateContrastFilter(0.75f);
  EXPECT_EQ(expected, blended);
}

TEST(FilterOperationsTest, BlendOpacityFilters) {
  FilterOperation from = FilterOperation::CreateOpacityFilter(0.25f);
  FilterOperation to = FilterOperation::CreateOpacityFilter(0.75f);

  FilterOperation blended = FilterOperation::Blend(&from, &to, -0.75);
  FilterOperation expected = FilterOperation::CreateOpacityFilter(0.f);
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(&from, &to, 0.75);
  expected = FilterOperation::CreateOpacityFilter(0.625f);
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(&from, &to, 1.8);
  expected = FilterOperation::CreateOpacityFilter(1.f);
  EXPECT_EQ(expected, blended);
}

TEST(FilterOperationsTest, BlendOpacityWithNull) {
  FilterOperation filter = FilterOperation::CreateOpacityFilter(0.f);

  FilterOperation blended = FilterOperation::Blend(&filter, NULL, 0.25);
  FilterOperation expected = FilterOperation::CreateOpacityFilter(0.25f);
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(NULL, &filter, 0.25);
  expected = FilterOperation::CreateOpacityFilter(0.75f);
  EXPECT_EQ(expected, blended);
}

TEST(FilterOperationsTest, BlendBlurFilters) {
  FilterOperation from = FilterOperation::CreateBlurFilter(3.f);
  FilterOperation to = FilterOperation::CreateBlurFilter(7.f);

  FilterOperation blended = FilterOperation::Blend(&from, &to, -0.9);
  FilterOperation expected = FilterOperation::CreateBlurFilter(0.f);
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(&from, &to, 0.75);
  expected = FilterOperation::CreateBlurFilter(6.f);
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(&from, &to, 1.5);
  expected = FilterOperation::CreateBlurFilter(9.f);
  EXPECT_EQ(expected, blended);
}

TEST(FilterOperationsTest, BlendBlurWithNull) {
  FilterOperation filter = FilterOperation::CreateBlurFilter(1.f);

  FilterOperation blended = FilterOperation::Blend(&filter, NULL, 0.25);
  FilterOperation expected = FilterOperation::CreateBlurFilter(0.75f);
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(NULL, &filter, 0.25);
  expected = FilterOperation::CreateBlurFilter(0.25f);
  EXPECT_EQ(expected, blended);
}

TEST(FilterOperationsTest, BlendDropShadowFilters) {
  FilterOperation from = FilterOperation::CreateDropShadowFilter(
      gfx::Point(0, 0), 2.f, SkColorSetARGB(15, 34, 68, 136));
  FilterOperation to = FilterOperation::CreateDropShadowFilter(
      gfx::Point(3, 5), 6.f, SkColorSetARGB(51, 30, 60, 120));

  FilterOperation blended = FilterOperation::Blend(&from, &to, -0.75);
  FilterOperation expected = FilterOperation::CreateDropShadowFilter(
      gfx::Point(-2, -4), 0.f, SkColorSetARGB(0, 0, 0, 0));
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(&from, &to, 0.25);
  expected = FilterOperation::CreateDropShadowFilter(
      gfx::Point(1, 1), 3.f, SkColorSetARGB(24, 32, 64, 128));
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(&from, &to, 0.75);
  expected = FilterOperation::CreateDropShadowFilter(
      gfx::Point(2, 4), 5.f, SkColorSetARGB(42, 30, 61, 121));
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(&from, &to, 1.5);
  expected = FilterOperation::CreateDropShadowFilter(
      gfx::Point(5, 8), 8.f, SkColorSetARGB(69, 30, 59, 118));
  EXPECT_EQ(expected, blended);
}

TEST(FilterOperationsTest, BlendDropShadowWithNull) {
  FilterOperation filter = FilterOperation::CreateDropShadowFilter(
      gfx::Point(4, 4), 4.f, SkColorSetARGB(255, 40, 0, 0));

  FilterOperation blended = FilterOperation::Blend(&filter, NULL, 0.25);
  FilterOperation expected = FilterOperation::CreateDropShadowFilter(
      gfx::Point(3, 3), 3.f, SkColorSetARGB(191, 40, 0, 0));
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(NULL, &filter, 0.25);
  expected = FilterOperation::CreateDropShadowFilter(
      gfx::Point(1, 1), 1.f, SkColorSetARGB(64, 40, 0, 0));
  EXPECT_EQ(expected, blended);
}

TEST(FilterOperationsTest, BlendZoomFilters) {
  FilterOperation from = FilterOperation::CreateZoomFilter(2.f, 3);
  FilterOperation to = FilterOperation::CreateZoomFilter(6.f, 0);

  FilterOperation blended = FilterOperation::Blend(&from, &to, -0.75);
  FilterOperation expected = FilterOperation::CreateZoomFilter(1.f, 5);
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(&from, &to, 0.75);
  expected = FilterOperation::CreateZoomFilter(5.f, 1);
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(&from, &to, 1.5);
  expected = FilterOperation::CreateZoomFilter(8.f, 0);
  EXPECT_EQ(expected, blended);
}

TEST(FilterOperationsTest, BlendZoomWithNull) {
  FilterOperation filter = FilterOperation::CreateZoomFilter(2.f, 1);

  FilterOperation blended = FilterOperation::Blend(&filter, NULL, 0.25);
  FilterOperation expected = FilterOperation::CreateZoomFilter(1.75f, 1);
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(NULL, &filter, 0.25);
  expected = FilterOperation::CreateZoomFilter(1.25f, 0);
  EXPECT_EQ(expected, blended);
}

TEST(FilterOperationsTest, BlendSaturatingBrightnessFilters) {
  FilterOperation from = FilterOperation::CreateSaturatingBrightnessFilter(3.f);
  FilterOperation to = FilterOperation::CreateSaturatingBrightnessFilter(7.f);

  FilterOperation blended = FilterOperation::Blend(&from, &to, -0.75);
  FilterOperation expected =
      FilterOperation::CreateSaturatingBrightnessFilter(0.f);
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(&from, &to, 0.75);
  expected = FilterOperation::CreateSaturatingBrightnessFilter(6.f);
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(&from, &to, 1.5);
  expected = FilterOperation::CreateSaturatingBrightnessFilter(9.f);
  EXPECT_EQ(expected, blended);
}

TEST(FilterOperationsTest, BlendSaturatingBrightnessWithNull) {
  FilterOperation filter =
      FilterOperation::CreateSaturatingBrightnessFilter(1.f);

  FilterOperation blended = FilterOperation::Blend(&filter, NULL, 0.25);
  FilterOperation expected =
      FilterOperation::CreateSaturatingBrightnessFilter(0.75f);
  EXPECT_EQ(expected, blended);

  blended = FilterOperation::Blend(NULL, &filter, 0.25);
  expected = FilterOperation::CreateSaturatingBrightnessFilter(0.25f);
  EXPECT_EQ(expected, blended);
}

TEST(FilterOperationsTest, BlendReferenceFilters) {
  skia::RefPtr<SkImageFilter> from_filter =
      skia::AdoptRef(SkBlurImageFilter::Create(1.f, 1.f));
  skia::RefPtr<SkImageFilter> to_filter =
      skia::AdoptRef(SkBlurImageFilter::Create(2.f, 2.f));
  FilterOperation from = FilterOperation::CreateReferenceFilter(from_filter);
  FilterOperation to = FilterOperation::CreateReferenceFilter(to_filter);

  FilterOperation blended = FilterOperation::Blend(&from, &to, -0.75);
  EXPECT_EQ(from, blended);

  blended = FilterOperation::Blend(&from, &to, 0.5);
  EXPECT_EQ(from, blended);

  blended = FilterOperation::Blend(&from, &to, 0.6);
  EXPECT_EQ(to, blended);

  blended = FilterOperation::Blend(&from, &to, 1.5);
  EXPECT_EQ(to, blended);
}

TEST(FilterOperationsTest, BlendReferenceWithNull) {
  skia::RefPtr<SkImageFilter> image_filter =
      skia::AdoptRef(SkBlurImageFilter::Create(1.f, 1.f));
  FilterOperation filter = FilterOperation::CreateReferenceFilter(image_filter);
  FilterOperation null_filter =
      FilterOperation::CreateReferenceFilter(skia::RefPtr<SkImageFilter>());

  FilterOperation blended = FilterOperation::Blend(&filter, NULL, 0.25);
  EXPECT_EQ(filter, blended);
  blended = FilterOperation::Blend(&filter, NULL, 0.75);
  EXPECT_EQ(null_filter, blended);

  blended = FilterOperation::Blend(NULL, &filter, 0.25);
  EXPECT_EQ(null_filter, blended);
  blended = FilterOperation::Blend(NULL, &filter, 0.75);
  EXPECT_EQ(filter, blended);
}

// Tests blending non-empty sequences that have the same length and matching
// operations.
TEST(FilterOperationsTest, BlendMatchingSequences) {
  FilterOperations from;
  FilterOperations to;

  from.Append(FilterOperation::CreateBlurFilter(0.f));
  to.Append(FilterOperation::CreateBlurFilter(2.f));

  from.Append(FilterOperation::CreateSaturateFilter(4.f));
  to.Append(FilterOperation::CreateSaturateFilter(0.f));

  from.Append(FilterOperation::CreateZoomFilter(2.0f, 1));
  to.Append(FilterOperation::CreateZoomFilter(10.f, 9));

  FilterOperations blended = to.Blend(from, -0.75);
  FilterOperations expected;
  expected.Append(FilterOperation::CreateBlurFilter(0.f));
  expected.Append(FilterOperation::CreateSaturateFilter(7.f));
  expected.Append(FilterOperation::CreateZoomFilter(1.f, 0));
  EXPECT_EQ(blended, expected);

  blended = to.Blend(from, 0.75);
  expected.Clear();
  expected.Append(FilterOperation::CreateBlurFilter(1.5f));
  expected.Append(FilterOperation::CreateSaturateFilter(1.f));
  expected.Append(FilterOperation::CreateZoomFilter(8.f, 7));
  EXPECT_EQ(blended, expected);

  blended = to.Blend(from, 1.5);
  expected.Clear();
  expected.Append(FilterOperation::CreateBlurFilter(3.f));
  expected.Append(FilterOperation::CreateSaturateFilter(0.f));
  expected.Append(FilterOperation::CreateZoomFilter(14.f, 13));
  EXPECT_EQ(blended, expected);
}

TEST(FilterOperationsTest, BlendEmptyAndNonEmptySequences) {
  FilterOperations empty;
  FilterOperations filters;

  filters.Append(FilterOperation::CreateGrayscaleFilter(0.75f));
  filters.Append(FilterOperation::CreateBrightnessFilter(2.f));
  filters.Append(FilterOperation::CreateHueRotateFilter(10.0f));

  FilterOperations blended = empty.Blend(filters, -0.75);
  FilterOperations expected;
  expected.Append(FilterOperation::CreateGrayscaleFilter(1.f));
  expected.Append(FilterOperation::CreateBrightnessFilter(2.75f));
  expected.Append(FilterOperation::CreateHueRotateFilter(17.5f));
  EXPECT_EQ(blended, expected);

  blended = empty.Blend(filters, 0.75);
  expected.Clear();
  expected.Append(FilterOperation::CreateGrayscaleFilter(0.1875f));
  expected.Append(FilterOperation::CreateBrightnessFilter(1.25f));
  expected.Append(FilterOperation::CreateHueRotateFilter(2.5f));
  EXPECT_EQ(blended, expected);

  blended = empty.Blend(filters, 1.5);
  expected.Clear();
  expected.Append(FilterOperation::CreateGrayscaleFilter(0.f));
  expected.Append(FilterOperation::CreateBrightnessFilter(0.5f));
  expected.Append(FilterOperation::CreateHueRotateFilter(-5.f));
  EXPECT_EQ(blended, expected);

  blended = filters.Blend(empty, -0.75);
  expected.Clear();
  expected.Append(FilterOperation::CreateGrayscaleFilter(0.f));
  expected.Append(FilterOperation::CreateBrightnessFilter(0.25f));
  expected.Append(FilterOperation::CreateHueRotateFilter(-7.5f));
  EXPECT_EQ(blended, expected);

  blended = filters.Blend(empty, 0.75);
  expected.Clear();
  expected.Append(FilterOperation::CreateGrayscaleFilter(0.5625f));
  expected.Append(FilterOperation::CreateBrightnessFilter(1.75f));
  expected.Append(FilterOperation::CreateHueRotateFilter(7.5f));
  EXPECT_EQ(blended, expected);

  blended = filters.Blend(empty, 1.5);
  expected.Clear();
  expected.Append(FilterOperation::CreateGrayscaleFilter(1.f));
  expected.Append(FilterOperation::CreateBrightnessFilter(2.5f));
  expected.Append(FilterOperation::CreateHueRotateFilter(15.f));
  EXPECT_EQ(blended, expected);
}

TEST(FilterOperationsTest, BlendEmptySequences) {
  FilterOperations empty;

  FilterOperations blended = empty.Blend(empty, -0.75);
  EXPECT_EQ(blended, empty);

  blended = empty.Blend(empty, 0.75);
  EXPECT_EQ(blended, empty);

  blended = empty.Blend(empty, 1.5);
  EXPECT_EQ(blended, empty);
}

// Tests blending non-empty sequences that have non-matching operations.
TEST(FilterOperationsTest, BlendNonMatchingSequences) {
  FilterOperations from;
  FilterOperations to;

  from.Append(FilterOperation::CreateSaturateFilter(3.f));
  from.Append(FilterOperation::CreateBlurFilter(2.f));
  to.Append(FilterOperation::CreateSaturateFilter(4.f));
  to.Append(FilterOperation::CreateHueRotateFilter(0.5f));

  FilterOperations blended = to.Blend(from, -0.75);
  EXPECT_EQ(to, blended);
  blended = to.Blend(from, 0.75);
  EXPECT_EQ(to, blended);
  blended = to.Blend(from, 1.5);
  EXPECT_EQ(to, blended);
}

// Tests blending non-empty sequences of different sizes.
TEST(FilterOperationsTest, BlendRaggedSequences) {
  FilterOperations from;
  FilterOperations to;

  from.Append(FilterOperation::CreateSaturateFilter(3.f));
  from.Append(FilterOperation::CreateBlurFilter(2.f));
  to.Append(FilterOperation::CreateSaturateFilter(4.f));

  FilterOperations blended = to.Blend(from, -0.75);
  FilterOperations expected;
  expected.Append(FilterOperation::CreateSaturateFilter(2.25f));
  expected.Append(FilterOperation::CreateBlurFilter(3.5f));
  EXPECT_EQ(expected, blended);

  blended = to.Blend(from, 0.75);
  expected.Clear();
  expected.Append(FilterOperation::CreateSaturateFilter(3.75f));
  expected.Append(FilterOperation::CreateBlurFilter(0.5f));
  EXPECT_EQ(expected, blended);

  blended = to.Blend(from, 1.5);
  expected.Clear();
  expected.Append(FilterOperation::CreateSaturateFilter(4.5f));
  expected.Append(FilterOperation::CreateBlurFilter(0.f));
  EXPECT_EQ(expected, blended);

  from.Append(FilterOperation::CreateOpacityFilter(1.f));
  to.Append(FilterOperation::CreateOpacityFilter(1.f));
  blended = to.Blend(from, -0.75);
  EXPECT_EQ(to, blended);
  blended = to.Blend(from, 0.75);
  EXPECT_EQ(to, blended);
  blended = to.Blend(from, 1.5);
  EXPECT_EQ(to, blended);
}

}  // namespace
}  // namespace cc