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      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 
     18 package android.support.v4.testutils;
     19 
     20 import static org.junit.Assert.assertEquals;
     21 import static org.junit.Assert.fail;
     22 
     23 import android.graphics.Bitmap;
     24 import android.graphics.Canvas;
     25 import android.graphics.Color;
     26 import android.graphics.Rect;
     27 import android.graphics.drawable.Drawable;
     28 
     29 import androidx.annotation.ColorInt;
     30 import androidx.annotation.NonNull;
     31 
     32 public class TestUtils {
     33     /**
     34      * Checks whether all the pixels in the specified drawable are of the same specified color.
     35      * If the passed <code>Drawable</code> does not have positive intrinsic dimensions set, this
     36      * method will throw an <code>IllegalArgumentException</code>. If there is a color mismatch,
     37      * this method will call <code>Assert.fail</code> with detailed description of the mismatch.
     38      */
     39     public static void assertAllPixelsOfColor(String failMessagePrefix, @NonNull Drawable drawable,
     40             @ColorInt int color) {
     41         int drawableWidth = drawable.getIntrinsicWidth();
     42         int drawableHeight = drawable.getIntrinsicHeight();
     43 
     44         if ((drawableWidth <= 0) || (drawableHeight <= 0)) {
     45             throw new IllegalArgumentException("Drawable must be configured to have non-zero size");
     46         }
     47 
     48         assertAllPixelsOfColor(failMessagePrefix, drawable, drawableWidth, drawableHeight, color,
     49                 false);
     50     }
     51 
     52     /**
     53      * Checks whether all the pixels in the specified drawable are of the same specified color.
     54      *
     55      * In case there is a color mismatch, the behavior of this method depends on the
     56      * <code>throwExceptionIfFails</code> parameter. If it is <code>true</code>, this method will
     57      * throw an <code>Exception</code> describing the mismatch. Otherwise this method will call
     58      * <code>Assert.fail</code> with detailed description of the mismatch.
     59      */
     60     public static void assertAllPixelsOfColor(String failMessagePrefix, @NonNull Drawable drawable,
     61             int drawableWidth, int drawableHeight, @ColorInt int color,
     62             boolean throwExceptionIfFails) {
     63         // Create a bitmap
     64         Bitmap bitmap = Bitmap.createBitmap(drawableWidth, drawableHeight, Bitmap.Config.ARGB_8888);
     65         // Create a canvas that wraps the bitmap
     66         Canvas canvas = new Canvas(bitmap);
     67         // Configure the drawable to have bounds that match its intrinsic size
     68         drawable.setBounds(0, 0, drawableWidth, drawableHeight);
     69         // And ask the drawable to draw itself to the canvas / bitmap
     70         drawable.draw(canvas);
     71 
     72         try {
     73             int[] rowPixels = new int[drawableWidth];
     74             for (int row = 0; row < drawableHeight; row++) {
     75                 bitmap.getPixels(rowPixels, 0, drawableWidth, 0, row, drawableWidth, 1);
     76                 for (int column = 0; column < drawableWidth; column++) {
     77                     if (rowPixels[column] != color) {
     78                         String mismatchDescription = failMessagePrefix
     79                                 + ": expected all drawable colors to be ["
     80                                 + Color.red(color) + "," + Color.green(color) + ","
     81                                 + Color.blue(color)
     82                                 + "] but at position (" + row + "," + column + ") found ["
     83                                 + Color.red(rowPixels[column]) + ","
     84                                 + Color.green(rowPixels[column]) + ","
     85                                 + Color.blue(rowPixels[column]) + "]";
     86                         if (throwExceptionIfFails) {
     87                             throw new RuntimeException(mismatchDescription);
     88                         } else {
     89                             fail(mismatchDescription);
     90                         }
     91                     }
     92                 }
     93             }
     94         } finally {
     95             bitmap.recycle();
     96         }
     97     }
     98 
     99     /**
    100      * Checks whether the specified rectangle matches the specified left / top / right /
    101      * bottom bounds.
    102      */
    103     public static void assertRectangleBounds(String failMessagePrefix, @NonNull Rect rectangle,
    104             int left, int top, int right, int bottom) {
    105         assertEquals(failMessagePrefix + " left", rectangle.left, left);
    106         assertEquals(failMessagePrefix + " top", rectangle.top, top);
    107         assertEquals(failMessagePrefix + " right", rectangle.right, right);
    108         assertEquals(failMessagePrefix + " bottom", rectangle.bottom, bottom);
    109     }
    110 }