| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.support.v4.graphics; |
| |
| import android.graphics.Color; |
| import android.test.AndroidTestCase; |
| |
| import java.lang.Integer; |
| import java.util.ArrayList; |
| |
| /** |
| * @hide |
| */ |
| public class ColorUtilsTest extends AndroidTestCase { |
| |
| // 0.5% of the max value |
| private static final float ALLOWED_OFFSET_HUE = 360 * 0.005f; |
| private static final float ALLOWED_OFFSET_SATURATION = 0.005f; |
| private static final float ALLOWED_OFFSET_LIGHTNESS = 0.005f; |
| private static final float ALLOWED_OFFSET_MIN_ALPHA = 0.01f; |
| |
| private static final int ALLOWED_OFFSET_RGB_COMPONENT = 2; |
| |
| private static final ArrayList<TestEntry> sEntryList = new ArrayList<>(); |
| |
| static { |
| sEntryList.add(new TestEntry(Color.BLACK).setHsl(0f, 0f, 0f) |
| .setWhiteMinAlpha30(0.35f).setWhiteMinAlpha45(0.46f)); |
| sEntryList.add(new TestEntry(Color.WHITE).setHsl(0f, 0f, 1f) |
| .setBlackMinAlpha30(0.42f).setBlackMinAlpha45(0.54f)); |
| sEntryList.add(new TestEntry(Color.BLUE).setHsl(240f, 1f, 0.5f) |
| .setWhiteMinAlpha30(0.55f).setWhiteMinAlpha45(0.71f)); |
| sEntryList.add(new TestEntry(Color.GREEN).setHsl(120f, 1f, 0.5f) |
| .setBlackMinAlpha30(0.43f).setBlackMinAlpha45(0.55f)); |
| sEntryList.add(new TestEntry(Color.RED).setHsl(0f, 1f, 0.5f) |
| .setWhiteMinAlpha30(0.84f).setBlackMinAlpha30(0.55f).setBlackMinAlpha45(0.78f)); |
| sEntryList.add(new TestEntry(Color.CYAN).setHsl(180f, 1f, 0.5f) |
| .setBlackMinAlpha30(0.43f).setBlackMinAlpha45(0.55f)); |
| sEntryList.add(new TestEntry(0xFF2196F3).setHsl(207f, 0.9f, 0.54f) |
| .setBlackMinAlpha30(0.52f).setWhiteMinAlpha30(0.97f).setBlackMinAlpha45(0.7f)); |
| sEntryList.add(new TestEntry(0xFFD1C4E9).setHsl(261f, 0.46f, 0.84f) |
| .setBlackMinAlpha30(0.45f).setBlackMinAlpha45(0.58f)); |
| sEntryList.add(new TestEntry(0xFF311B92).setHsl(251.09f, 0.687f, 0.339f) |
| .setWhiteMinAlpha30(0.39f).setWhiteMinAlpha45(0.54f)); |
| } |
| |
| public void testToHSL() { |
| for (TestEntry entry : sEntryList) { |
| testColorToHSL(entry.rgb, entry.hsl); |
| } |
| } |
| |
| public void testFromHSL() { |
| for (TestEntry entry : sEntryList) { |
| testHSLToColor(entry.hsl, entry.rgb); |
| } |
| } |
| |
| public void testToHslLimits() { |
| final float[] hsl = new float[3]; |
| |
| for (TestEntry entry : sEntryList) { |
| ColorUtils.colorToHSL(entry.rgb, hsl); |
| |
| assertTrue(hsl[0] >= 0f && hsl[0] <= 360f); |
| assertTrue(hsl[1] >= 0f && hsl[1] <= 1f); |
| assertTrue(hsl[2] >= 0f && hsl[2] <= 1f); |
| } |
| } |
| |
| public void testMinAlphas() { |
| for (TestEntry entry : sEntryList) { |
| testMinAlpha("Black title", entry.rgb, entry.blackMinAlpha30, |
| ColorUtils.calculateMinimumAlpha(Color.BLACK, entry.rgb, 3.0f)); |
| testMinAlpha("Black body", entry.rgb, entry.blackMinAlpha45, |
| ColorUtils.calculateMinimumAlpha(Color.BLACK, entry.rgb, 4.5f)); |
| testMinAlpha("White title", entry.rgb, entry.whiteMinAlpha30, |
| ColorUtils.calculateMinimumAlpha(Color.WHITE, entry.rgb, 3.0f)); |
| testMinAlpha("White body", entry.rgb, entry.whiteMinAlpha45, |
| ColorUtils.calculateMinimumAlpha(Color.WHITE, entry.rgb, 4.5f)); |
| } |
| } |
| |
| private static void testMinAlpha(String title, int color, float expected, int actual) { |
| final String message = title + " text within error for #" + Integer.toHexString(color); |
| if (expected < 0) { |
| assertEquals(message, actual, -1); |
| } else { |
| assertClose(message, expected, actual / 255f, ALLOWED_OFFSET_MIN_ALPHA); |
| } |
| } |
| |
| private static void assertClose(String message, float expected, float actual, |
| float allowedOffset) { |
| StringBuilder sb = new StringBuilder(message); |
| sb.append(". Expected: ").append(expected).append(". Actual: ").append(actual); |
| |
| assertTrue(sb.toString(), Math.abs(expected - actual) <= allowedOffset); |
| } |
| |
| private static void assertClose(String message, int expected, int actual, |
| int allowedOffset) { |
| StringBuilder sb = new StringBuilder(message); |
| sb.append(". Expected: ").append(expected).append(". Actual: ").append(actual); |
| |
| assertTrue(sb.toString(), Math.abs(expected - actual) <= allowedOffset); |
| } |
| |
| private static void testColorToHSL(int color, float[] expectedHsl) { |
| float[] actualHSL = new float[3]; |
| ColorUtils.colorToHSL(color, actualHSL); |
| |
| assertClose("Hue not within offset", expectedHsl[0], actualHSL[0], |
| ALLOWED_OFFSET_HUE); |
| assertClose("Saturation not within offset", expectedHsl[1], actualHSL[1], |
| ALLOWED_OFFSET_SATURATION); |
| assertClose("Lightness not within offset", expectedHsl[2], actualHSL[2], |
| ALLOWED_OFFSET_LIGHTNESS); |
| } |
| |
| private static void testHSLToColor(float[] hsl, int expectedRgb) { |
| final int actualRgb = ColorUtils.HSLToColor(hsl); |
| |
| assertClose("Red not within offset", |
| Color.red(expectedRgb), Color.red(actualRgb), ALLOWED_OFFSET_RGB_COMPONENT); |
| assertClose("Green not within offset", |
| Color.green(expectedRgb), Color.green(actualRgb), ALLOWED_OFFSET_RGB_COMPONENT); |
| assertClose("Blue not within offset", |
| Color.blue(expectedRgb), Color.blue(actualRgb), ALLOWED_OFFSET_RGB_COMPONENT); |
| } |
| |
| private static class TestEntry { |
| final int rgb; |
| final float[] hsl = new float[3]; |
| float blackMinAlpha45 = -1; |
| float blackMinAlpha30 = -1; |
| float whiteMinAlpha45 = -1; |
| float whiteMinAlpha30 = -1; |
| |
| TestEntry(int rgb) { |
| this.rgb = rgb; |
| } |
| |
| TestEntry setHsl(float h, float s, float l) { |
| hsl[0] = h; |
| hsl[1] = s; |
| hsl[2] = l; |
| return this; |
| } |
| |
| TestEntry setBlackMinAlpha30(float minAlpha) { |
| blackMinAlpha30 = minAlpha; |
| return this; |
| } |
| |
| TestEntry setBlackMinAlpha45(float minAlpha) { |
| blackMinAlpha45 = minAlpha; |
| return this; |
| } |
| |
| TestEntry setWhiteMinAlpha30(float minAlpha) { |
| whiteMinAlpha30 = minAlpha; |
| return this; |
| } |
| |
| TestEntry setWhiteMinAlpha45(float minAlpha) { |
| whiteMinAlpha45 = minAlpha; |
| return this; |
| } |
| } |
| } |