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 java.lang.IllegalArgumentException;
21import java.lang.RuntimeException;
22
23import android.graphics.Bitmap;
24import android.graphics.Canvas;
25import android.graphics.Color;
26import android.graphics.Rect;
27import android.graphics.drawable.Drawable;
28import android.support.annotation.ColorInt;
29import android.support.annotation.NonNull;
30import android.util.DisplayMetrics;
31import android.util.TypedValue;
32
33import junit.framework.Assert;
34
35public class TestUtils {
36    /**
37     * Converts the specified value from dips to pixels for use as view size.
38     */
39    public static int convertSizeDipsToPixels(DisplayMetrics displayMetrics, int dipValue) {
40        // Round to the nearest int value. This follows the logic in
41        // TypedValue.complexToDimensionPixelSize
42        final int res = (int) (dipValue * displayMetrics.density + 0.5f);
43        if (res != 0) {
44            return res;
45        }
46        if (dipValue == 0) {
47            return 0;
48        }
49        if (dipValue > 0) {
50            return 1;
51        }
52        return -1;
53    }
54
55    /**
56     * Converts the specified value from dips to pixels for use as view offset.
57     */
58    public static int convertOffsetDipsToPixels(DisplayMetrics displayMetrics, int dipValue) {
59        // Round to the nearest int value.
60        return (int) (dipValue * displayMetrics.density);
61    }
62
63
64    /**
65     * Checks whether all the pixels in the specified drawable are of the same specified color.
66     * If the passed <code>Drawable</code> does not have positive intrinsic dimensions set, this
67     * method will throw an <code>IllegalArgumentException</code>. If there is a color mismatch,
68     * this method will call <code>Assert.fail</code> with detailed description of the mismatch.
69     */
70    public static void assertAllPixelsOfColor(String failMessagePrefix, @NonNull Drawable drawable,
71            @ColorInt int color) {
72        int drawableWidth = drawable.getIntrinsicWidth();
73        int drawableHeight = drawable.getIntrinsicHeight();
74
75        if ((drawableWidth <= 0) || (drawableHeight <= 0)) {
76            throw new IllegalArgumentException("Drawable must be configured to have non-zero size");
77        }
78
79        assertAllPixelsOfColor(failMessagePrefix, drawable, drawableWidth, drawableHeight, color,
80                false);
81    }
82
83    /**
84     * Checks whether all the pixels in the specified drawable are of the same specified color.
85     *
86     * In case there is a color mismatch, the behavior of this method depends on the
87     * <code>throwExceptionIfFails</code> parameter. If it is <code>true</code>, this method will
88     * throw an <code>Exception</code> describing the mismatch. Otherwise this method will call
89     * <code>Assert.fail</code> with detailed description of the mismatch.
90     */
91    public static void assertAllPixelsOfColor(String failMessagePrefix, @NonNull Drawable drawable,
92            int drawableWidth, int drawableHeight, @ColorInt int color,
93            boolean throwExceptionIfFails) {
94        // Create a bitmap
95        Bitmap bitmap = Bitmap.createBitmap(drawableWidth, drawableHeight, Bitmap.Config.ARGB_8888);
96        // Create a canvas that wraps the bitmap
97        Canvas canvas = new Canvas(bitmap);
98        // Configure the drawable to have bounds that match its intrinsic size
99        drawable.setBounds(0, 0, drawableWidth, drawableHeight);
100        // And ask the drawable to draw itself to the canvas / bitmap
101        drawable.draw(canvas);
102
103        try {
104            int[] rowPixels = new int[drawableWidth];
105            for (int row = 0; row < drawableHeight; row++) {
106                bitmap.getPixels(rowPixels, 0, drawableWidth, 0, row, drawableWidth, 1);
107                for (int column = 0; column < drawableWidth; column++) {
108                    if (rowPixels[column] != color) {
109                        String mismatchDescription = failMessagePrefix
110                                + ": expected all drawable colors to be ["
111                                + Color.red(color) + "," + Color.green(color) + ","
112                                + Color.blue(color)
113                                + "] but at position (" + row + "," + column + ") found ["
114                                + Color.red(rowPixels[column]) + ","
115                                + Color.green(rowPixels[column]) + ","
116                                + Color.blue(rowPixels[column]) + "]";
117                        if (throwExceptionIfFails) {
118                            throw new RuntimeException(mismatchDescription);
119                        } else {
120                            Assert.fail(mismatchDescription);
121                        }
122                    }
123                }
124            }
125        } finally {
126            bitmap.recycle();
127        }
128    }
129
130    /**
131     * Checks whether the specified rectangle matches the specified left / top / right /
132     * bottom bounds.
133     */
134    public static void assertRectangleBounds(String failMessagePrefix, @NonNull Rect rectangle,
135            int left, int top, int right, int bottom) {
136        Assert.assertEquals(failMessagePrefix + " left", rectangle.left, left);
137        Assert.assertEquals(failMessagePrefix + " top", rectangle.top, top);
138        Assert.assertEquals(failMessagePrefix + " right", rectangle.right, right);
139        Assert.assertEquals(failMessagePrefix + " bottom", rectangle.bottom, bottom);
140    }
141}