1// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include <stdlib.h>
6
7#include "testing/gtest/include/gtest/gtest.h"
8#include "third_party/skia/include/core/SkBitmap.h"
9#include "third_party/skia/include/core/SkColorPriv.h"
10#include "ui/gfx/color_utils.h"
11
12TEST(ColorUtils, SkColorToHSLRed) {
13  color_utils::HSL hsl = { 0, 0, 0 };
14  color_utils::SkColorToHSL(SK_ColorRED, &hsl);
15  EXPECT_DOUBLE_EQ(hsl.h, 0);
16  EXPECT_DOUBLE_EQ(hsl.s, 1);
17  EXPECT_DOUBLE_EQ(hsl.l, 0.5);
18}
19
20TEST(ColorUtils, SkColorToHSLGrey) {
21  color_utils::HSL hsl = { 0, 0, 0 };
22  color_utils::SkColorToHSL(SkColorSetARGB(255, 128, 128, 128), &hsl);
23  EXPECT_DOUBLE_EQ(hsl.h, 0);
24  EXPECT_DOUBLE_EQ(hsl.s, 0);
25  EXPECT_EQ(static_cast<int>(hsl.l * 100),
26            static_cast<int>(0.5 * 100));  // Accurate to two decimal places.
27}
28
29TEST(ColorUtils, HSLToSkColorWithAlpha) {
30  SkColor red = SkColorSetARGB(128, 255, 0, 0);
31  color_utils::HSL hsl = { 0, 1, 0.5 };
32  SkColor result = color_utils::HSLToSkColor(hsl, 128);
33  EXPECT_EQ(SkColorGetA(red), SkColorGetA(result));
34  EXPECT_EQ(SkColorGetR(red), SkColorGetR(result));
35  EXPECT_EQ(SkColorGetG(red), SkColorGetG(result));
36  EXPECT_EQ(SkColorGetB(red), SkColorGetB(result));
37}
38
39
40TEST(ColorUtils, RGBtoHSLRoundTrip) {
41  // Just spot check values near the edges.
42  for (int r = 0; r < 10; ++r) {
43    for (int g = 0; g < 10; ++g) {
44      for (int b = 0; b < 10; ++b) {
45        SkColor rgb = SkColorSetARGB(255, r, g, b);
46        color_utils::HSL hsl = { 0, 0, 0 };
47        color_utils::SkColorToHSL(rgb, &hsl);
48        SkColor out = color_utils::HSLToSkColor(hsl, 255);
49        EXPECT_EQ(SkColorGetR(out), SkColorGetR(rgb));
50        EXPECT_EQ(SkColorGetG(out), SkColorGetG(rgb));
51        EXPECT_EQ(SkColorGetB(out), SkColorGetB(rgb));
52      }
53    }
54  }
55  for (int r = 240; r < 256; ++r) {
56    for (int g = 240; g < 256; ++g) {
57      for (int b = 240; b < 256; ++b) {
58        SkColor rgb = SkColorSetARGB(255, r, g, b);
59        color_utils::HSL hsl = { 0, 0, 0 };
60        color_utils::SkColorToHSL(rgb, &hsl);
61        SkColor out = color_utils::HSLToSkColor(hsl, 255);
62        EXPECT_EQ(SkColorGetR(out), SkColorGetR(rgb));
63        EXPECT_EQ(SkColorGetG(out), SkColorGetG(rgb));
64        EXPECT_EQ(SkColorGetB(out), SkColorGetB(rgb));
65      }
66    }
67  }
68}
69
70TEST(ColorUtils, ColorToHSLRegisterSpill) {
71  // In a opt build on Linux, this was causing a register spill on my laptop
72  // (Pentium M) when converting from SkColor to HSL.
73  SkColor input = SkColorSetARGB(255, 206, 154, 89);
74  color_utils::HSL hsl = { -1, -1, -1 };
75  SkColor result = color_utils::HSLShift(input, hsl);
76  // |result| should be the same as |input| since we passed in a value meaning
77  // no color shift.
78  EXPECT_EQ(SkColorGetA(input), SkColorGetA(result));
79  EXPECT_EQ(SkColorGetR(input), SkColorGetR(result));
80  EXPECT_EQ(SkColorGetG(input), SkColorGetG(result));
81  EXPECT_EQ(SkColorGetB(input), SkColorGetB(result));
82}
83
84TEST(ColorUtils, AlphaBlend) {
85  SkColor fore = SkColorSetARGB(255, 200, 200, 200);
86  SkColor back = SkColorSetARGB(255, 100, 100, 100);
87
88  EXPECT_TRUE(color_utils::AlphaBlend(fore, back, 255) ==
89              fore);
90  EXPECT_TRUE(color_utils::AlphaBlend(fore, back, 0) ==
91              back);
92
93  // One is fully transparent, result is partially transparent.
94  back = SkColorSetA(back, 0);
95  EXPECT_EQ(136U, SkColorGetA(color_utils::AlphaBlend(fore, back, 136)));
96
97  // Both are fully transparent, result is fully transparent.
98  fore = SkColorSetA(fore, 0);
99  EXPECT_EQ(0U, SkColorGetA(color_utils::AlphaBlend(fore, back, 255)));
100}
101