1 /* 2 * Copyright (C) 2018 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not 5 * use this file except in compliance with the License. You may obtain a copy of 6 * 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, WITHOUT 12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 13 * License for the specific language governing permissions and limitations under 14 * the License. 15 */ 16 17 package android.text; 18 19 import android.content.res.ColorStateList; 20 import android.graphics.Typeface; 21 import android.icu.text.UnicodeSet; 22 import android.icu.text.UnicodeSetIterator; 23 import android.text.style.TextAppearanceSpan; 24 25 import java.nio.CharBuffer; 26 import java.util.ArrayList; 27 import java.util.Random; 28 29 public class TextPerfUtils { 30 31 private static final int PARA_LENGTH = 500; // Number of characters in a paragraph. 32 33 private Random mRandom = new Random(0); 34 35 private static final String[] ALPHABET; 36 private static final int ALPHABET_LENGTH; 37 static { 38 String alphabets = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; 39 ALPHABET_LENGTH = alphabets.length(); 40 ALPHABET = new String[ALPHABET_LENGTH]; 41 for (int i = 0; i < ALPHABET_LENGTH; ++i) { 42 ALPHABET[i] = Character.toString(alphabets.charAt(i)); 43 } 44 } 45 46 47 private static final ColorStateList TEXT_COLOR = ColorStateList.valueOf(0x00000000); 48 private static final String[] FAMILIES = { "sans-serif", "serif", "monospace" }; 49 private static final int[] STYLES = { 50 Typeface.NORMAL, Typeface.BOLD, Typeface.ITALIC, Typeface.BOLD_ITALIC 51 }; 52 53 public void resetRandom(long seed) { 54 mRandom = new Random(seed); 55 } 56 57 private static String[] UnicodeSetToArray(String setStr) { 58 final UnicodeSet set = new UnicodeSet(setStr); 59 final UnicodeSetIterator iterator = new UnicodeSetIterator(set); 60 final ArrayList<String> out = new ArrayList<>(set.size()); 61 while (iterator.next()) { 62 out.add(iterator.getString()); 63 } 64 return out.toArray(new String[out.size()]); 65 } 66 67 public CharSequence nextRandomParagraph(int wordLen, boolean applyRandomStyle, String setStr) { 68 return nextRandomParagraph(wordLen, PARA_LENGTH, applyRandomStyle, 69 UnicodeSetToArray(setStr)); 70 } 71 72 public CharSequence nextRandomParagraph(int wordLen, boolean applyRandomStyle) { 73 return nextRandomParagraph(wordLen, PARA_LENGTH, applyRandomStyle, ALPHABET); 74 } 75 76 public CharSequence nextRandomParagraph(int wordLen, int paraLength) { 77 return nextRandomParagraph(wordLen, paraLength, false /* no style */, ALPHABET); 78 } 79 80 public CharSequence nextRandomParagraph(int wordLen, int paraLength, boolean applyRandomStyle, 81 String[] charSet) { 82 ArrayList<Character> chars = new ArrayList<>(); 83 ArrayList<Integer> wordOffsets = new ArrayList<>(); 84 for (int i = 0; i < paraLength; i++) { 85 if (i % (wordLen + 1) == wordLen) { 86 chars.add(' '); 87 wordOffsets.add(chars.size()); 88 } else { 89 final String str = charSet[mRandom.nextInt(charSet.length)]; 90 for (int j = 0; j < str.length(); ++j) { 91 chars.add(str.charAt(j)); 92 } 93 } 94 } 95 wordOffsets.add(chars.size()); 96 97 char[] buffer = new char[chars.size()]; 98 for (int i = 0; i < buffer.length; ++i) { 99 buffer[i] = chars.get(i); 100 } 101 CharSequence cs = CharBuffer.wrap(buffer); 102 if (!applyRandomStyle) { 103 return cs; 104 } 105 106 SpannableStringBuilder ssb = new SpannableStringBuilder(cs); 107 int prevWordStart = 0; 108 for (int i = 0; i < wordOffsets.size(); i++) { 109 final int spanStart = prevWordStart; 110 final int spanEnd = wordOffsets.get(i); 111 112 final TextAppearanceSpan span = new TextAppearanceSpan( 113 FAMILIES[mRandom.nextInt(FAMILIES.length)], 114 STYLES[mRandom.nextInt(STYLES.length)], 115 24 + mRandom.nextInt(32), // text size. min 24 max 56 116 TEXT_COLOR, TEXT_COLOR); 117 118 ssb.setSpan(span, spanStart, spanEnd, Spanned.SPAN_INCLUSIVE_EXCLUSIVE); 119 prevWordStart = spanEnd; 120 } 121 return ssb; 122 } 123 } 124