ui/gfx/color_utils_unittest.cc

   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
  12 TEST(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
  20 TEST(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
  29 TEST(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
  40 TEST(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
  70 TEST(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
  84 TEST(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 }