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// Copyright 2019 The Chromium Authors
// 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 <algorithm>
#include "testing/gtest/include/gtest/gtest.h"
#include "ui/color/color_mixer.h"
#include "ui/color/color_test_ids.h"
#include "ui/color/color_transform.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 = {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 = DeriveDefaultIconColor(FromTransformInput()) +
BlendForMinContrast(FromTransformInput(), kColorTest0);
constexpr SkColor kBackground = SK_ColorWHITE;
ColorMixer mixer;
mixer[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
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