1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17
18package android.support.v4.testutils;
19
20import android.graphics.Bitmap;
21import android.graphics.Canvas;
22import android.graphics.Color;
23import android.graphics.Rect;
24import android.graphics.drawable.Drawable;
25import android.support.annotation.ColorInt;
26import android.support.annotation.NonNull;
27import junit.framework.Assert;
28
29public class TestUtils {
30    /**
31     * Checks whether all the pixels in the specified drawable are of the same specified color.
32     * If the passed <code>Drawable</code> does not have positive intrinsic dimensions set, this
33     * method will throw an <code>IllegalArgumentException</code>. If there is a color mismatch,
34     * this method will call <code>Assert.fail</code> with detailed description of the mismatch.
35     */
36    public static void assertAllPixelsOfColor(String failMessagePrefix, @NonNull Drawable drawable,
37            @ColorInt int color) {
38        int drawableWidth = drawable.getIntrinsicWidth();
39        int drawableHeight = drawable.getIntrinsicHeight();
40
41        if ((drawableWidth <= 0) || (drawableHeight <= 0)) {
42            throw new IllegalArgumentException("Drawable must be configured to have non-zero size");
43        }
44
45        assertAllPixelsOfColor(failMessagePrefix, drawable, drawableWidth, drawableHeight, color,
46                false);
47    }
48
49    /**
50     * Checks whether all the pixels in the specified drawable are of the same specified color.
51     *
52     * In case there is a color mismatch, the behavior of this method depends on the
53     * <code>throwExceptionIfFails</code> parameter. If it is <code>true</code>, this method will
54     * throw an <code>Exception</code> describing the mismatch. Otherwise this method will call
55     * <code>Assert.fail</code> with detailed description of the mismatch.
56     */
57    public static void assertAllPixelsOfColor(String failMessagePrefix, @NonNull Drawable drawable,
58            int drawableWidth, int drawableHeight, @ColorInt int color,
59            boolean throwExceptionIfFails) {
60        // Create a bitmap
61        Bitmap bitmap = Bitmap.createBitmap(drawableWidth, drawableHeight, Bitmap.Config.ARGB_8888);
62        // Create a canvas that wraps the bitmap
63        Canvas canvas = new Canvas(bitmap);
64        // Configure the drawable to have bounds that match its intrinsic size
65        drawable.setBounds(0, 0, drawableWidth, drawableHeight);
66        // And ask the drawable to draw itself to the canvas / bitmap
67        drawable.draw(canvas);
68
69        try {
70            int[] rowPixels = new int[drawableWidth];
71            for (int row = 0; row < drawableHeight; row++) {
72                bitmap.getPixels(rowPixels, 0, drawableWidth, 0, row, drawableWidth, 1);
73                for (int column = 0; column < drawableWidth; column++) {
74                    if (rowPixels[column] != color) {
75                        String mismatchDescription = failMessagePrefix
76                                + ": expected all drawable colors to be ["
77                                + Color.red(color) + "," + Color.green(color) + ","
78                                + Color.blue(color)
79                                + "] but at position (" + row + "," + column + ") found ["
80                                + Color.red(rowPixels[column]) + ","
81                                + Color.green(rowPixels[column]) + ","
82                                + Color.blue(rowPixels[column]) + "]";
83                        if (throwExceptionIfFails) {
84                            throw new RuntimeException(mismatchDescription);
85                        } else {
86                            Assert.fail(mismatchDescription);
87                        }
88                    }
89                }
90            }
91        } finally {
92            bitmap.recycle();
93        }
94    }
95
96    /**
97     * Checks whether the specified rectangle matches the specified left / top / right /
98     * bottom bounds.
99     */
100    public static void assertRectangleBounds(String failMessagePrefix, @NonNull Rect rectangle,
101            int left, int top, int right, int bottom) {
102        Assert.assertEquals(failMessagePrefix + " left", rectangle.left, left);
103        Assert.assertEquals(failMessagePrefix + " top", rectangle.top, top);
104        Assert.assertEquals(failMessagePrefix + " right", rectangle.right, right);
105        Assert.assertEquals(failMessagePrefix + " bottom", rectangle.bottom, bottom);
106    }
107}