| /* |
| * 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 com.android.benchmark.ui; |
| |
| import android.content.res.Resources; |
| import android.graphics.Bitmap; |
| import android.graphics.BitmapFactory; |
| |
| import java.util.Random; |
| |
| public class Utils { |
| |
| private static final int RANDOM_WORD_LENGTH = 10; |
| |
| public static String getRandomWord(Random random, int length) { |
| StringBuilder builder = new StringBuilder(); |
| for (int i = 0; i < length; i++) { |
| char base = random.nextBoolean() ? 'A' : 'a'; |
| char nextChar = (char)(random.nextInt(26) + base); |
| builder.append(nextChar); |
| } |
| return builder.toString(); |
| } |
| |
| public static String[] buildStringList(int count) { |
| Random random = new Random(0); |
| String[] result = new String[count]; |
| for (int i = 0; i < count; i++) { |
| result[i] = getRandomWord(random, RANDOM_WORD_LENGTH); |
| } |
| |
| return result; |
| } |
| |
| // a small number of strings reused frequently, expected to hit |
| // in the word-granularity text layout cache |
| static final String[] CACHE_HIT_STRINGS = new String[] { |
| "a", |
| "small", |
| "number", |
| "of", |
| "strings", |
| "reused", |
| "frequently" |
| }; |
| |
| private static final int WORDS_IN_PARAGRAPH = 150; |
| |
| // misses are fairly long 'words' to ensure they miss |
| private static final int PARAGRAPH_MISS_MIN_LENGTH = 4; |
| private static final int PARAGRAPH_MISS_MAX_LENGTH = 9; |
| |
| static String[] buildParagraphListWithHitPercentage(int paragraphCount, int hitPercentage) { |
| if (hitPercentage < 0 || hitPercentage > 100) throw new IllegalArgumentException(); |
| |
| String[] strings = new String[paragraphCount]; |
| Random random = new Random(0); |
| for (int i = 0; i < strings.length; i++) { |
| StringBuilder result = new StringBuilder(); |
| for (int word = 0; word < WORDS_IN_PARAGRAPH; word++) { |
| if (word != 0) { |
| result.append(" "); |
| } |
| if (random.nextInt(100) < hitPercentage) { |
| // add a common word, which is very likely to hit in the cache |
| result.append(CACHE_HIT_STRINGS[random.nextInt(CACHE_HIT_STRINGS.length)]); |
| } else { |
| // construct a random word, which will *most likely* miss |
| int length = PARAGRAPH_MISS_MIN_LENGTH; |
| length += random.nextInt(PARAGRAPH_MISS_MAX_LENGTH - PARAGRAPH_MISS_MIN_LENGTH); |
| |
| result.append(getRandomWord(random, length)); |
| } |
| } |
| strings[i] = result.toString(); |
| } |
| |
| return strings; |
| } |
| |
| |
| public static int calculateInSampleSize( |
| BitmapFactory.Options options, int reqWidth, int reqHeight) { |
| // Raw height and width of image |
| final int height = options.outHeight; |
| final int width = options.outWidth; |
| int inSampleSize = 1; |
| |
| if (height > reqHeight || width > reqWidth) { |
| |
| final int halfHeight = height / 2; |
| final int halfWidth = width / 2; |
| |
| // Calculate the largest inSampleSize value that is a power of 2 and keeps both |
| // height and width larger than the requested height and width. |
| while ((halfHeight / inSampleSize) > reqHeight |
| && (halfWidth / inSampleSize) > reqWidth) { |
| inSampleSize *= 2; |
| } |
| } |
| |
| return inSampleSize; |
| } |
| |
| public static Bitmap decodeSampledBitmapFromResource(Resources res, int resId, |
| int reqWidth, int reqHeight) { |
| |
| // First decode with inJustDecodeBounds=true to check dimensions |
| final BitmapFactory.Options options = new BitmapFactory.Options(); |
| options.inJustDecodeBounds = true; |
| BitmapFactory.decodeResource(res, resId, options); |
| |
| // Calculate inSampleSize |
| options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight); |
| |
| // Decode bitmap with inSampleSize set |
| options.inJustDecodeBounds = false; |
| return BitmapFactory.decodeResource(res, resId, options); |
| } |
| |
| } |