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// Copyright (c) 2006-2008 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 <stdlib.h>
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/skia/include/core/SkColorPriv.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/color_utils.h"
#include "ui/gfx/geometry/rect.h"
namespace color_utils {
TEST(ColorUtils, SkColorToHSLRed) {
HSL hsl = {0, 0, 0};
SkColorToHSL(SK_ColorRED, &hsl);
EXPECT_DOUBLE_EQ(hsl.h, 0);
EXPECT_DOUBLE_EQ(hsl.s, 1);
EXPECT_DOUBLE_EQ(hsl.l, 0.5);
}
TEST(ColorUtils, SkColorToHSLGrey) {
HSL hsl = {0, 0, 0};
SkColorToHSL(SkColorSetARGB(255, 128, 128, 128), &hsl);
EXPECT_DOUBLE_EQ(hsl.h, 0);
EXPECT_DOUBLE_EQ(hsl.s, 0);
EXPECT_EQ(static_cast<int>(hsl.l * 100),
static_cast<int>(0.5 * 100)); // Accurate to two decimal places.
}
TEST(ColorUtils, HSLToSkColorWithAlpha) {
SkColor red = SkColorSetARGB(128, 255, 0, 0);
HSL hsl = {0, 1, 0.5};
SkColor result = HSLToSkColor(hsl, 128);
EXPECT_EQ(SkColorGetA(red), SkColorGetA(result));
EXPECT_EQ(SkColorGetR(red), SkColorGetR(result));
EXPECT_EQ(SkColorGetG(red), SkColorGetG(result));
EXPECT_EQ(SkColorGetB(red), SkColorGetB(result));
}
TEST(ColorUtils, RGBtoHSLRoundTrip) {
// Just spot check values near the edges.
for (int r = 0; r < 10; ++r) {
for (int g = 0; g < 10; ++g) {
for (int b = 0; b < 10; ++b) {
SkColor rgb = SkColorSetARGB(255, r, g, b);
HSL hsl = {0, 0, 0};
SkColorToHSL(rgb, &hsl);
SkColor out = HSLToSkColor(hsl, 255);
EXPECT_EQ(SkColorGetR(out), SkColorGetR(rgb));
EXPECT_EQ(SkColorGetG(out), SkColorGetG(rgb));
EXPECT_EQ(SkColorGetB(out), SkColorGetB(rgb));
}
}
}
for (int r = 240; r < 256; ++r) {
for (int g = 240; g < 256; ++g) {
for (int b = 240; b < 256; ++b) {
SkColor rgb = SkColorSetARGB(255, r, g, b);
HSL hsl = {0, 0, 0};
SkColorToHSL(rgb, &hsl);
SkColor out = HSLToSkColor(hsl, 255);
EXPECT_EQ(SkColorGetR(out), SkColorGetR(rgb));
EXPECT_EQ(SkColorGetG(out), SkColorGetG(rgb));
EXPECT_EQ(SkColorGetB(out), SkColorGetB(rgb));
}
}
}
}
TEST(ColorUtils, IsWithinHSLRange) {
HSL hsl = {0.3, 0.4, 0.5};
HSL lower = {0.2, 0.3, 0.4};
HSL upper = {0.4, 0.5, 0.6};
EXPECT_TRUE(IsWithinHSLRange(hsl, lower, upper));
// Bounds are inclusive.
hsl.h = 0.2;
EXPECT_TRUE(IsWithinHSLRange(hsl, lower, upper));
hsl.h = 0.4;
EXPECT_TRUE(IsWithinHSLRange(hsl, lower, upper));
hsl.s = 0.3;
EXPECT_TRUE(IsWithinHSLRange(hsl, lower, upper));
hsl.s = 0.5;
EXPECT_TRUE(IsWithinHSLRange(hsl, lower, upper));
hsl.l = 0.4;
EXPECT_TRUE(IsWithinHSLRange(hsl, lower, upper));
hsl.l = 0.6;
EXPECT_TRUE(IsWithinHSLRange(hsl, lower, upper));
}
TEST(ColorUtils, IsWithinHSLRangeHueWrapAround) {
HSL hsl = {0.3, 0.4, 0.5};
HSL lower = {0.8, -1, -1};
HSL upper = {1.2, -1, -1};
hsl.h = 0.1;
EXPECT_TRUE(IsWithinHSLRange(hsl, lower, upper));
hsl.h = 0.9;
EXPECT_TRUE(IsWithinHSLRange(hsl, lower, upper));
hsl.h = 0.3;
EXPECT_FALSE(IsWithinHSLRange(hsl, lower, upper));
}
TEST(ColorUtils, ColorToHSLRegisterSpill) {
// In a opt build on Linux, this was causing a register spill on my laptop
// (Pentium M) when converting from SkColor to HSL.
SkColor input = SkColorSetARGB(255, 206, 154, 89);
HSL hsl = {-1, -1, -1};
SkColor result = HSLShift(input, hsl);
// |result| should be the same as |input| since we passed in a value meaning
// no color shift.
EXPECT_EQ(SkColorGetA(input), SkColorGetA(result));
EXPECT_EQ(SkColorGetR(input), SkColorGetR(result));
EXPECT_EQ(SkColorGetG(input), SkColorGetG(result));
EXPECT_EQ(SkColorGetB(input), SkColorGetB(result));
}
TEST(ColorUtils, CalculateBoringScore_Empty) {
SkBitmap bitmap;
EXPECT_DOUBLE_EQ(1.0, CalculateBoringScore(bitmap));
}
TEST(ColorUtils, CalculateBoringScore_SingleColor) {
const gfx::Size kSize(20, 10);
gfx::Canvas canvas(kSize, 1.0f, true);
// Fill all pixels in black.
canvas.FillRect(gfx::Rect(kSize), SK_ColorBLACK);
SkBitmap bitmap =
skia::GetTopDevice(*canvas.sk_canvas())->accessBitmap(false);
// The thumbnail should deserve the highest boring score.
EXPECT_DOUBLE_EQ(1.0, CalculateBoringScore(bitmap));
}
TEST(ColorUtils, CalculateBoringScore_TwoColors) {
const gfx::Size kSize(20, 10);
gfx::Canvas canvas(kSize, 1.0f, true);
// Fill all pixels in black.
canvas.FillRect(gfx::Rect(kSize), SK_ColorBLACK);
// Fill the left half pixels in white.
canvas.FillRect(gfx::Rect(0, 0, kSize.width() / 2, kSize.height()),
SK_ColorWHITE);
SkBitmap bitmap =
skia::GetTopDevice(*canvas.sk_canvas())->accessBitmap(false);
ASSERT_EQ(kSize.width(), bitmap.width());
ASSERT_EQ(kSize.height(), bitmap.height());
// The thumbnail should be less boring because two colors are used.
EXPECT_DOUBLE_EQ(0.5, CalculateBoringScore(bitmap));
}
TEST(ColorUtils, AlphaBlend) {
SkColor fore = SkColorSetARGB(255, 200, 200, 200);
SkColor back = SkColorSetARGB(255, 100, 100, 100);
EXPECT_TRUE(AlphaBlend(fore, back, 255) == fore);
EXPECT_TRUE(AlphaBlend(fore, back, 0) == back);
// One is fully transparent, result is partially transparent.
back = SkColorSetA(back, 0);
EXPECT_EQ(136U, SkColorGetA(AlphaBlend(fore, back, 136)));
// Both are fully transparent, result is fully transparent.
fore = SkColorSetA(fore, 0);
EXPECT_EQ(0U, SkColorGetA(AlphaBlend(fore, back, 255)));
}
} // namespace color_utils
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