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| 1 | +/* | |
| 2 | + * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package sun.font; | |
| 27 | + | |
| 28 | +import java.lang.ref.Reference; | |
| 29 | +import java.awt.FontFormatException; | |
| 30 | +import java.awt.geom.GeneralPath; | |
| 31 | +import java.awt.geom.Point2D; | |
| 32 | +import java.awt.geom.Rectangle2D; | |
| 33 | +import java.io.File; | |
| 34 | +import java.nio.ByteBuffer; | |
| 35 | +import sun.java2d.Disposer; | |
| 36 | +import sun.java2d.DisposerRecord; | |
| 37 | + | |
| 38 | +import java.io.IOException; | |
| 39 | +import java.security.AccessController; | |
| 40 | +import java.security.PrivilegedActionException; | |
| 41 | +import java.security.PrivilegedExceptionAction; | |
| 42 | + | |
| 43 | +public abstract class FileFont extends PhysicalFont { | |
| 44 | + | |
| 45 | + protected boolean useJavaRasterizer = true; | |
| 46 | + | |
| 47 | + /* I/O and file operations are always synchronized on the font | |
| 48 | + * object. Two threads can be accessing the font and retrieving | |
| 49 | + * information, and synchronized only to the extent that filesystem | |
| 50 | + * operations require. | |
| 51 | + * A limited number of files can be open at a time, to limit the | |
| 52 | + * absorption of file descriptors. If a file needs to be opened | |
| 53 | + * when there are none free, then the synchronization of all I/O | |
| 54 | + * ensures that any in progress operation will complete before some | |
| 55 | + * other thread closes the descriptor in order to allocate another one. | |
| 56 | + */ | |
| 57 | + // NB consider using a RAF. FIS has finalize method so may take a | |
| 58 | + // little longer to be GC'd. We don't use this stream at all anyway. | |
| 59 | + // In fact why increase the size of a FileFont object if the stream | |
| 60 | + // isn't needed .. | |
| 61 | + //protected FileInputStream stream; | |
| 62 | + //protected FileChannel channel; | |
| 63 | + protected int fileSize; | |
| 64 | + | |
| 65 | + protected FontScaler scaler; | |
| 66 | + | |
| 67 | + /* The following variables are used, (and in the case of the arrays, | |
| 68 | + * only initialised) for select fonts where a native scaler may be | |
| 69 | + * used to get glyph images and metrics. | |
| 70 | + * glyphToCharMap is filled in on the fly and used to do a reverse | |
| 71 | + * lookup when a FileFont needs to get the charcode back from a glyph | |
| 72 | + * code so it can re-map via a NativeGlyphMapper to get a native glyph. | |
| 73 | + * This isn't a big hit in time, since a boolean test is sufficient | |
| 74 | + * to choose the usual default path, nor in memory for fonts which take | |
| 75 | + * the native path, since fonts have contiguous zero-based glyph indexes, | |
| 76 | + * and these obviously do all exist in the font. | |
| 77 | + */ | |
| 78 | + protected boolean checkedNatives; | |
| 79 | + protected boolean useNatives; | |
| 80 | + protected NativeFont[] nativeFonts; | |
| 81 | + protected char[] glyphToCharMap; | |
| 82 | + /* | |
| 83 | + * @throws FontFormatException - if the font can't be opened | |
| 84 | + */ | |
| 85 | + FileFont(String platname, Object nativeNames) | |
| 86 | + throws FontFormatException { | |
| 87 | + | |
| 88 | + super(platname, nativeNames); | |
| 89 | + } | |
| 90 | + | |
| 91 | + FontStrike createStrike(FontStrikeDesc desc) { | |
| 92 | + if (!checkedNatives) { | |
| 93 | + checkUseNatives(); | |
| 94 | + } | |
| 95 | + return new FileFontStrike(this, desc); | |
| 96 | + } | |
| 97 | + | |
| 98 | + protected boolean checkUseNatives() { | |
| 99 | + checkedNatives = true; | |
| 100 | + return useNatives; | |
| 101 | + } | |
| 102 | + | |
| 103 | + /* This method needs to be accessible to FontManager if there is | |
| 104 | + * file pool management. It may be a no-op. | |
| 105 | + */ | |
| 106 | + protected abstract void close(); | |
| 107 | + | |
| 108 | + | |
| 109 | + /* | |
| 110 | + * This is the public interface. The subclasses need to implement | |
| 111 | + * this. The returned block may be longer than the requested length. | |
| 112 | + */ | |
| 113 | + abstract ByteBuffer readBlock(int offset, int length); | |
| 114 | + | |
| 115 | + public boolean canDoStyle(int style) { | |
| 116 | + return true; | |
| 117 | + } | |
| 118 | + | |
| 119 | + void setFileToRemove(File file, CreatedFontTracker tracker) { | |
| 120 | + Disposer.addObjectRecord(this, | |
| 121 | + new CreatedFontFileDisposerRecord(file, tracker)); | |
| 122 | + } | |
| 123 | + | |
| 124 | + /* This is called when a font scaler is determined to | |
| 125 | + * be unusable (ie bad). | |
| 126 | + * We want to replace current scaler with NullFontScaler, so | |
| 127 | + * we never try to use same font scaler again. | |
| 128 | + * Scaler native resources could have already been disposed | |
| 129 | + * or they will be eventually by Java2D disposer. | |
| 130 | + * However, it should be safe to call dispose() explicitly here. | |
| 131 | + * | |
| 132 | + * For safety we also invalidate all strike's scaler context. | |
| 133 | + * So, in case they cache pointer to native scaler | |
| 134 | + * it will not ever be used. | |
| 135 | + * | |
| 136 | + * It also appears desirable to remove all the entries from the | |
| 137 | + * cache so no other code will pick them up. But we can't just | |
| 138 | + * 'delete' them as code may be using them. And simply dropping | |
| 139 | + * the reference to the cache will make the reference objects | |
| 140 | + * unreachable and so they will not get disposed. | |
| 141 | + * Since a strike may hold (via java arrays) native pointers to many | |
| 142 | + * rasterised glyphs, this would be a memory leak. | |
| 143 | + * The solution is : | |
| 144 | + * - to move all the entries to another map where they | |
| 145 | + * are no longer locatable | |
| 146 | + * - update FontStrikeDisposer to be able to distinguish which | |
| 147 | + * map they are held in via a boolean flag | |
| 148 | + * Since this isn't expected to be anything other than an extremely | |
| 149 | + * rare maybe it is not worth doing this last part. | |
| 150 | + */ | |
| 151 | + synchronized void deregisterFontAndClearStrikeCache() { | |
| 152 | + SunFontManager fm = SunFontManager.getInstance(); | |
| 153 | + fm.deRegisterBadFont(this); | |
| 154 | + | |
| 155 | + for (Reference strikeRef : strikeCache.values()) { | |
| 156 | + if (strikeRef != null) { | |
| 157 | + /* NB we know these are all FileFontStrike instances | |
| 158 | + * because the cache is on this FileFont | |
| 159 | + */ | |
| 160 | + FileFontStrike strike = (FileFontStrike)strikeRef.get(); | |
| 161 | + if (strike != null && strike.pScalerContext != 0L) { | |
| 162 | + scaler.invalidateScalerContext(strike.pScalerContext); | |
| 163 | + } | |
| 164 | + } | |
| 165 | + } | |
| 166 | + scaler.dispose(); | |
| 167 | + scaler = FontScaler.getNullScaler(); | |
| 168 | + } | |
| 169 | + | |
| 170 | + StrikeMetrics getFontMetrics(long pScalerContext) { | |
| 171 | + try { | |
| 172 | + return getScaler().getFontMetrics(pScalerContext); | |
| 173 | + } catch (FontScalerException fe) { | |
| 174 | + scaler = FontScaler.getNullScaler(); | |
| 175 | + return getFontMetrics(pScalerContext); | |
| 176 | + } | |
| 177 | + } | |
| 178 | + | |
| 179 | + float getGlyphAdvance(long pScalerContext, int glyphCode) { | |
| 180 | + try { | |
| 181 | + return getScaler().getGlyphAdvance(pScalerContext, glyphCode); | |
| 182 | + } catch (FontScalerException fe) { | |
| 183 | + scaler = FontScaler.getNullScaler(); | |
| 184 | + return getGlyphAdvance(pScalerContext, glyphCode); | |
| 185 | + } | |
| 186 | + } | |
| 187 | + | |
| 188 | + void getGlyphMetrics(long pScalerContext, int glyphCode, Point2D.Float metrics) { | |
| 189 | + try { | |
| 190 | + getScaler().getGlyphMetrics(pScalerContext, glyphCode, metrics); | |
| 191 | + } catch (FontScalerException fe) { | |
| 192 | + scaler = FontScaler.getNullScaler(); | |
| 193 | + getGlyphMetrics(pScalerContext, glyphCode, metrics); | |
| 194 | + } | |
| 195 | + } | |
| 196 | + | |
| 197 | + long getGlyphImage(long pScalerContext, int glyphCode) { | |
| 198 | + try { | |
| 199 | + return getScaler().getGlyphImage(pScalerContext, glyphCode); | |
| 200 | + } catch (FontScalerException fe) { | |
| 201 | + scaler = FontScaler.getNullScaler(); | |
| 202 | + return getGlyphImage(pScalerContext, glyphCode); | |
| 203 | + } | |
| 204 | + } | |
| 205 | + | |
| 206 | + Rectangle2D.Float getGlyphOutlineBounds(long pScalerContext, int glyphCode) { | |
| 207 | + try { | |
| 208 | + return getScaler().getGlyphOutlineBounds(pScalerContext, glyphCode); | |
| 209 | + } catch (FontScalerException fe) { | |
| 210 | + scaler = FontScaler.getNullScaler(); | |
| 211 | + return getGlyphOutlineBounds(pScalerContext, glyphCode); | |
| 212 | + } | |
| 213 | + } | |
| 214 | + | |
| 215 | + GeneralPath getGlyphOutline(long pScalerContext, int glyphCode, float x, float y) { | |
| 216 | + try { | |
| 217 | + return getScaler().getGlyphOutline(pScalerContext, glyphCode, x, y); | |
| 218 | + } catch (FontScalerException fe) { | |
| 219 | + scaler = FontScaler.getNullScaler(); | |
| 220 | + return getGlyphOutline(pScalerContext, glyphCode, x, y); | |
| 221 | + } | |
| 222 | + } | |
| 223 | + | |
| 224 | + GeneralPath getGlyphVectorOutline(long pScalerContext, int[] glyphs, int numGlyphs, float x, float y) { | |
| 225 | + try { | |
| 226 | + return getScaler().getGlyphVectorOutline(pScalerContext, glyphs, numGlyphs, x, y); | |
| 227 | + } catch (FontScalerException fe) { | |
| 228 | + scaler = FontScaler.getNullScaler(); | |
| 229 | + return getGlyphVectorOutline(pScalerContext, glyphs, numGlyphs, x, y); | |
| 230 | + } | |
| 231 | + } | |
| 232 | + | |
| 233 | + /* T1 & TT implementation differ so this method is abstract. | |
| 234 | + NB: null should not be returned here! */ | |
| 235 | + protected abstract FontScaler getScaler(); | |
| 236 | + | |
| 237 | + protected long getUnitsPerEm() { | |
| 238 | + return getScaler().getUnitsPerEm(); | |
| 239 | + } | |
| 240 | + | |
| 241 | + private static class CreatedFontFileDisposerRecord | |
| 242 | + implements DisposerRecord { | |
| 243 | + | |
| 244 | + File fontFile = null; | |
| 245 | + CreatedFontTracker tracker; | |
| 246 | + | |
| 247 | + private CreatedFontFileDisposerRecord(File file, | |
| 248 | + CreatedFontTracker tracker) { | |
| 249 | + fontFile = file; | |
| 250 | + this.tracker = tracker; | |
| 251 | + } | |
| 252 | + | |
| 253 | + public void dispose() { | |
| 254 | + java.security.AccessController.doPrivileged( | |
| 255 | + new java.security.PrivilegedAction() { | |
| 256 | + public Object run() { | |
| 257 | + if (fontFile != null) { | |
| 258 | + try { | |
| 259 | + if (tracker != null) { | |
| 260 | + tracker.subBytes((int)fontFile.length()); | |
| 261 | + } | |
| 262 | + /* REMIND: is it possible that the file is | |
| 263 | + * still open? It will be closed when the | |
| 264 | + * font2D is disposed but could this code | |
| 265 | + * execute first? If so the file would not | |
| 266 | + * be deleted on MS-windows. | |
| 267 | + */ | |
| 268 | + fontFile.delete(); | |
| 269 | + /* remove from delete on exit hook list : */ | |
| 270 | + // FIXME: still need to be refactored | |
| 271 | + SunFontManager.getInstance().tmpFontFiles.remove(fontFile); | |
| 272 | + } catch (Exception e) { | |
| 273 | + } | |
| 274 | + } | |
| 275 | + return null; | |
| 276 | + } | |
| 277 | + }); | |
| 278 | + } | |
| 279 | + } | |
| 280 | + | |
| 281 | + protected String getPublicFileName() { | |
| 282 | + SecurityManager sm = System.getSecurityManager(); | |
| 283 | + if (sm == null) { | |
| 284 | + return platName; | |
| 285 | + } | |
| 286 | + boolean canReadProperty = true; | |
| 287 | + | |
| 288 | + try { | |
| 289 | + sm.checkPropertyAccess("java.io.tmpdir"); | |
| 290 | + } catch (SecurityException e) { | |
| 291 | + canReadProperty = false; | |
| 292 | + } | |
| 293 | + | |
| 294 | + if (canReadProperty) { | |
| 295 | + return platName; | |
| 296 | + } | |
| 297 | + | |
| 298 | + final File f = new File(platName); | |
| 299 | + | |
| 300 | + Boolean isTmpFile = Boolean.FALSE; | |
| 301 | + try { | |
| 302 | + isTmpFile = AccessController.doPrivileged( | |
| 303 | + new PrivilegedExceptionAction<Boolean>() { | |
| 304 | + public Boolean run() { | |
| 305 | + File tmp = new File(System.getProperty("java.io.tmpdir")); | |
| 306 | + try { | |
| 307 | + String tpath = tmp.getCanonicalPath(); | |
| 308 | + String fpath = f.getCanonicalPath(); | |
| 309 | + | |
| 310 | + return (fpath == null) || fpath.startsWith(tpath); | |
| 311 | + } catch (IOException e) { | |
| 312 | + return Boolean.TRUE; | |
| 313 | + } | |
| 314 | + } | |
| 315 | + } | |
| 316 | + ); | |
| 317 | + } catch (PrivilegedActionException e) { | |
| 318 | + // unable to verify whether value of java.io.tempdir will be | |
| 319 | + // exposed, so return only a name of the font file. | |
| 320 | + isTmpFile = Boolean.TRUE; | |
| 321 | + } | |
| 322 | + | |
| 323 | + return isTmpFile ? "temp file" : platName; | |
| 324 | + } | |
| 325 | +} | |