1 /* 2 * Copyright (C) 2008 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 package android.renderscript; 18 19 import java.io.File; 20 import java.io.IOException; 21 import java.io.InputStream; 22 import java.util.HashMap; 23 import java.util.Map; 24 25 import android.os.Environment; 26 27 import android.content.res.AssetManager; 28 import android.content.res.Resources; 29 import android.util.Log; 30 import android.util.TypedValue; 31 32 /** 33 * <p>This class gives users a simple way to draw hardware accelerated text. 34 * Internally, the glyphs are rendered using the Freetype library and an internal cache of 35 * rendered glyph bitmaps is maintained. Each font object represents a combination of a typeface, 36 * and point size. You can create multiple font objects to represent styles such as bold or italic text, 37 * faces, and different font sizes. During creation, the Android system quieries device's screen DPI to 38 * ensure proper sizing across multiple device configurations.</p> 39 * <p>Fonts are rendered using screen-space positions and no state setup beyond binding a 40 * font to the Renderscript is required. A note of caution on performance, though the state changes 41 * are transparent to the user, they do happen internally, and it is more efficient to 42 * render large batches of text in sequence. It is also more efficient to render multiple 43 * characters at once instead of one by one to improve draw call batching.</p> 44 * <p>Font color and transparency are not part of the font object and you can freely modify 45 * them in the script to suit the user's rendering needs. Font colors work as a state machine. 46 * Every new call to draw text uses the last color set in the script.</p> 47 **/ 48 public class Font extends BaseObj { 49 50 //These help us create a font by family name 51 private static final String[] sSansNames = { 52 "sans-serif", "arial", "helvetica", "tahoma", "verdana" 53 }; 54 55 private static final String[] sSerifNames = { 56 "serif", "times", "times new roman", "palatino", "georgia", "baskerville", 57 "goudy", "fantasy", "cursive", "ITC Stone Serif" 58 }; 59 60 private static final String[] sMonoNames = { 61 "monospace", "courier", "courier new", "monaco" 62 }; 63 64 private static class FontFamily { 65 String[] mNames; 66 String mNormalFileName; 67 String mBoldFileName; 68 String mItalicFileName; 69 String mBoldItalicFileName; 70 } 71 72 private static Map<String, FontFamily> sFontFamilyMap; 73 74 public enum Style { 75 NORMAL, 76 BOLD, 77 ITALIC, 78 BOLD_ITALIC; 79 } 80 81 private static void addFamilyToMap(FontFamily family) { 82 for(int i = 0; i < family.mNames.length; i ++) { 83 sFontFamilyMap.put(family.mNames[i], family); 84 } 85 } 86 87 private static void initFontFamilyMap() { 88 sFontFamilyMap = new HashMap<String, FontFamily>(); 89 90 FontFamily sansFamily = new FontFamily(); 91 sansFamily.mNames = sSansNames; 92 sansFamily.mNormalFileName = "Roboto-Regular.ttf"; 93 sansFamily.mBoldFileName = "Roboto-Bold.ttf"; 94 sansFamily.mItalicFileName = "Roboto-Italic.ttf"; 95 sansFamily.mBoldItalicFileName = "Roboto-BoldItalic.ttf"; 96 addFamilyToMap(sansFamily); 97 98 FontFamily serifFamily = new FontFamily(); 99 serifFamily.mNames = sSerifNames; 100 serifFamily.mNormalFileName = "DroidSerif-Regular.ttf"; 101 serifFamily.mBoldFileName = "DroidSerif-Bold.ttf"; 102 serifFamily.mItalicFileName = "DroidSerif-Italic.ttf"; 103 serifFamily.mBoldItalicFileName = "DroidSerif-BoldItalic.ttf"; 104 addFamilyToMap(serifFamily); 105 106 FontFamily monoFamily = new FontFamily(); 107 monoFamily.mNames = sMonoNames; 108 monoFamily.mNormalFileName = "DroidSansMono.ttf"; 109 monoFamily.mBoldFileName = "DroidSansMono.ttf"; 110 monoFamily.mItalicFileName = "DroidSansMono.ttf"; 111 monoFamily.mBoldItalicFileName = "DroidSansMono.ttf"; 112 addFamilyToMap(monoFamily); 113 } 114 115 static { 116 initFontFamilyMap(); 117 } 118 119 static String getFontFileName(String familyName, Style style) { 120 FontFamily family = sFontFamilyMap.get(familyName); 121 if(family != null) { 122 switch(style) { 123 case NORMAL: 124 return family.mNormalFileName; 125 case BOLD: 126 return family.mBoldFileName; 127 case ITALIC: 128 return family.mItalicFileName; 129 case BOLD_ITALIC: 130 return family.mBoldItalicFileName; 131 } 132 } 133 // Fallback if we could not find the desired family 134 return "DroidSans.ttf"; 135 } 136 137 Font(int id, RenderScript rs) { 138 super(id, rs); 139 } 140 141 /** 142 * Takes a specific file name as an argument 143 */ 144 static public Font createFromFile(RenderScript rs, Resources res, String path, float pointSize) { 145 rs.validate(); 146 int dpi = res.getDisplayMetrics().densityDpi; 147 int fontId = rs.nFontCreateFromFile(path, pointSize, dpi); 148 149 if(fontId == 0) { 150 throw new RSRuntimeException("Unable to create font from file " + path); 151 } 152 Font rsFont = new Font(fontId, rs); 153 154 return rsFont; 155 } 156 157 static public Font createFromFile(RenderScript rs, Resources res, File path, float pointSize) { 158 return createFromFile(rs, res, path.getAbsolutePath(), pointSize); 159 } 160 161 static public Font createFromAsset(RenderScript rs, Resources res, String path, float pointSize) { 162 rs.validate(); 163 AssetManager mgr = res.getAssets(); 164 int dpi = res.getDisplayMetrics().densityDpi; 165 166 int fontId = rs.nFontCreateFromAsset(mgr, path, pointSize, dpi); 167 if(fontId == 0) { 168 throw new RSRuntimeException("Unable to create font from asset " + path); 169 } 170 Font rsFont = new Font(fontId, rs); 171 return rsFont; 172 } 173 174 static public Font createFromResource(RenderScript rs, Resources res, int id, float pointSize) { 175 String name = "R." + Integer.toString(id); 176 177 rs.validate(); 178 InputStream is = null; 179 try { 180 is = res.openRawResource(id); 181 } catch (Exception e) { 182 throw new RSRuntimeException("Unable to open resource " + id); 183 } 184 185 int dpi = res.getDisplayMetrics().densityDpi; 186 187 int fontId = 0; 188 if (is instanceof AssetManager.AssetInputStream) { 189 int asset = ((AssetManager.AssetInputStream) is).getAssetInt(); 190 fontId = rs.nFontCreateFromAssetStream(name, pointSize, dpi, asset); 191 } else { 192 throw new RSRuntimeException("Unsupported asset stream created"); 193 } 194 195 if(fontId == 0) { 196 throw new RSRuntimeException("Unable to create font from resource " + id); 197 } 198 Font rsFont = new Font(fontId, rs); 199 return rsFont; 200 } 201 202 /** 203 * Accepts one of the following family names as an argument 204 * and will attempt to produce the best match with a system font: 205 * 206 * "sans-serif" "arial" "helvetica" "tahoma" "verdana" 207 * "serif" "times" "times new roman" "palatino" "georgia" "baskerville" 208 * "goudy" "fantasy" "cursive" "ITC Stone Serif" 209 * "monospace" "courier" "courier new" "monaco" 210 * 211 * Returns default font if no match could be found. 212 */ 213 static public Font create(RenderScript rs, Resources res, String familyName, Style fontStyle, float pointSize) { 214 String fileName = getFontFileName(familyName, fontStyle); 215 String fontPath = Environment.getRootDirectory().getAbsolutePath(); 216 fontPath += "/fonts/" + fileName; 217 return createFromFile(rs, res, fontPath, pointSize); 218 } 219 220 } 221
