blob: 3f9d7c1665e183b8b1489489a7bca4d4acd3cd02 [file] [log] [blame]
// Copyright 2019 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 "ui/color/color_recipe.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "ui/color/color_mixer.h"
#include "ui/color/color_set.h"
#include "ui/color/color_unittest_utils.h"
#include "ui/gfx/color_palette.h"
namespace ui {
namespace {
// Tests that a recipe with no transforms passes through its input color
// unchanged.
TEST(ColorRecipeTest, EmptyRecipeIsPassthrough) {
const ColorRecipe recipe;
const auto verify_passthrough = [&](SkColor input) {
EXPECT_EQ(input, recipe.GenerateResult(input, ColorMixer()));
};
verify_passthrough(SK_ColorBLACK);
verify_passthrough(SK_ColorWHITE);
verify_passthrough(SK_ColorRED);
}
// Tests that a transform in a recipe has an effect.
TEST(ColorRecipeTest, OneTransform) {
constexpr SkColor kOutput = SK_ColorGREEN;
ColorRecipe recipe;
recipe.AddTransform(FromColor(kOutput));
const auto verify_transform = [&](SkColor input) {
EXPECT_EQ(kOutput, recipe.GenerateResult(input, ColorMixer()));
};
verify_transform(SK_ColorBLACK);
verify_transform(SK_ColorWHITE);
verify_transform(SK_ColorRED);
}
// Tests that in a recipe with multiple transforms, each is applied.
TEST(ColorRecipeTest, ChainedTransforms) {
ColorRecipe recipe;
recipe.AddTransform(DeriveDefaultIconColor())
.AddTransform(BlendForMinContrast(kColorTest0));
constexpr SkColor kBackground = SK_ColorWHITE;
ColorMixer mixer;
mixer.AddSet({kColorSetTest0, {{kColorTest0, kBackground}}});
const auto verify_chain = [&](SkColor input) {
const SkColor color = recipe.GenerateResult(input, mixer);
// The DeriveDefaultIconColor transform should change the output color even
// when the BlendForMinContrast transform takes no action.
EXPECT_NE(input, color);
// The BlendForMinContrast transform should always be able to guarantee
// readable contrast against white.
EXPECT_GE(color_utils::GetContrastRatio(color, kBackground),
color_utils::kMinimumReadableContrastRatio);
};
verify_chain(SK_ColorBLACK);
verify_chain(SK_ColorWHITE);
verify_chain(SK_ColorRED);
}
} // namespace
} // namespace ui