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| 1 | /* | ||
| 2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 3 | * | ||
| 4 | * This code is free software; you can redistribute it and/or modify it | ||
| 5 | * under the terms of the GNU General Public License version 2 only, as | ||
| 6 | * published by the Free Software Foundation. Oracle designates this | ||
| 7 | * particular file as subject to the "Classpath" exception as provided | ||
| 8 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 9 | * | ||
| 10 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 13 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 14 | * accompanied this code). | ||
| 15 | * | ||
| 16 | * You should have received a copy of the GNU General Public License version | ||
| 17 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 18 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 19 | * | ||
| 20 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 21 | * or visit www.oracle.com if you need additional information or have any | ||
| 22 | * questions. | ||
| 23 | * | ||
| 24 | */ | ||
| 25 | |||
| 26 | /* | ||
| 27 | * | ||
| 28 | * (C) Copyright IBM Corp. 2003 - All Rights Reserved | ||
| 29 | */ | ||
| 30 | |||
| 31 | package sun.font; | ||
| 32 | |||
| 33 | import sun.font.GlyphLayout.*; | ||
| 34 | import java.awt.geom.Point2D; | ||
| 35 | import java.lang.ref.SoftReference; | ||
| 36 | import java.util.HashMap; | ||
| 37 | import java.util.Locale; | ||
| 38 | |||
| 39 | /* | ||
| 40 | * different ways to do this | ||
| 41 | * 1) each physical font2d keeps a hashtable mapping scripts to layout | ||
| 42 | * engines, we query and fill this cache. | ||
| 43 | * 2) we keep a mapping independent of font using the key Most likely | ||
| 44 | * few fonts will be used, so option 2 seems better | ||
| 45 | * | ||
| 46 | * Once we know which engine to use for a font, we always know, so we | ||
| 47 | * shouldn't have to recheck each time we do layout. So the cache is | ||
| 48 | * ok. | ||
| 49 | * | ||
| 50 | * Should we reuse engines? We could instantiate an engine for each | ||
| 51 | * font/script pair. The engine would hold onto the table(s) from the | ||
| 52 | * font that it needs. If we have multiple threads using the same | ||
| 53 | * engine, we still need to keep the state separate, so the native | ||
| 54 | * engines would still need to be allocated for each call, since they | ||
| 55 | * keep their state in themselves. If they used the passed-in GVData | ||
| 56 | * arrays directly (with some checks for space) then since each GVData | ||
| 57 | * is different per thread, we could reuse the layout engines. This | ||
| 58 | * still requires a separate layout engine per font, because of the | ||
| 59 | * table state in the engine. If we pushed that out too and passed it | ||
| 60 | * in with the native call as well, we'd be ok if the layout engines | ||
| 61 | * keep all their process state on the stack, but I don't know if this | ||
| 62 | * is true. Then we'd basically just be down to an engine index which | ||
| 63 | * we pass into native and then invoke the engine code (now a | ||
| 64 | * procedure call, not an object invocation) based on a switch on the | ||
| 65 | * index. There would be only half a dozen engine objects then, not | ||
| 66 | * potentially half a dozen per font. But we'd have to stack-allocate | ||
| 67 | * some state that included the pointer to the required font tables. | ||
| 68 | * | ||
| 69 | * Seems for now that the way to do things is to come in with a | ||
| 70 | * selector and the font. The selector indicates which engine to use, | ||
| 71 | * the engine is stack allocated and initialized with the required | ||
| 72 | * font tables (the selector indicates which). Then layout is called, | ||
| 73 | * the contents are copied (or not), and the stack is destroyed on | ||
| 74 | * exit. So the association is between the font/script (layout engine | ||
| 75 | * desc) and and one of a few permanent engine objects, which are | ||
| 76 | * handed the key when they need to process something. In the native | ||
| 77 | * case, the engine holds an index, and just passes it together with | ||
| 78 | * the key info down to native. Some default cases are the 'default | ||
| 79 | * layout' case that just runs the c2gmapper, this stays in java and | ||
| 80 | * just uses the mapper from the font/strike. Another default case | ||
| 81 | * might be the unicode arabic shaper, since this doesn't care about | ||
| 82 | * the font (or script or lang?) it wouldn't need to extract this | ||
| 83 | * data. It could be (yikes) ported back to java even to avoid | ||
| 84 | * upcalls to check if the font supports a particular unicode | ||
| 85 | * character. | ||
| 86 | * | ||
| 87 | * I'd expect that the majority of scripts use the default mapper for | ||
| 88 | * a particular font. Loading the hastable with 40 or so keys 30+ of | ||
| 89 | * which all map to the same object is unfortunate. It might be worth | ||
| 90 | * instead having a per-font list of 'scripts with non-default | ||
| 91 | * engines', e.g. the factory has a hashtable mapping fonts to 'script | ||
| 92 | * lists' (the factory has this since the design potentially has other | ||
| 93 | * factories, though I admit there's no client for this yet and no | ||
| 94 | * public api) and then the script list is queried for the script in | ||
| 95 | * question. it can be preloaded at creation time with all the | ||
| 96 | * scripts that don't have default engines-- either a list or a hash | ||
| 97 | * table, so a null return from the table means 'default' and not 'i | ||
| 98 | * don't know yet'. | ||
| 99 | * | ||
| 100 | * On the other hand, in most all cases the number of unique | ||
| 101 | * script/font combinations will be small, so a flat hashtable should | ||
| 102 | * suffice. | ||
| 103 | * */ | ||
| 104 | public final class SunLayoutEngine implements LayoutEngine, LayoutEngineFactory { | ||
| 105 | private static native void initGVIDs(); | ||
| 106 | static { | ||
| 107 | FontManagerNativeLibrary.load(); | ||
| 108 | initGVIDs(); | ||
| 109 | } | ||
| 110 | |||
| 111 | private LayoutEngineKey key; | ||
| 112 | |||
| 113 | private static LayoutEngineFactory instance; | ||
| 114 | |||
| 115 | public static LayoutEngineFactory instance() { | ||
| 116 | if (instance == null) { | ||
| 117 | instance = new SunLayoutEngine(); | ||
| 118 | } | ||
| 119 | return instance; | ||
| 120 | } | ||
| 121 | |||
| 122 | private SunLayoutEngine() { | ||
| 123 | // actually a factory, key is null so layout cannot be called on it | ||
| 124 | } | ||
| 125 | |||
| 126 | public LayoutEngine getEngine(Font2D font, int script, int lang) { | ||
| 127 | return getEngine(new LayoutEngineKey(font, script, lang)); | ||
| 128 | } | ||
| 129 | |||
| 130 | // !!! don't need this unless we have more than one sun layout engine... | ||
| 131 | public LayoutEngine getEngine(LayoutEngineKey key) { | ||
| 132 | HashMap cache = (HashMap)cacheref.get(); | ||
| 133 | if (cache == null) { | ||
| 134 | cache = new HashMap(); | ||
| 135 | cacheref = new SoftReference(cache); | ||
| 136 | } | ||
| 137 | |||
| 138 | LayoutEngine e = (LayoutEngine)cache.get(key); | ||
| 139 | if (e == null) { | ||
| 140 | e = new SunLayoutEngine(key.copy()); | ||
| 141 | cache.put(key, e); | ||
| 142 | } | ||
| 143 | return e; | ||
| 144 | } | ||
| 145 | private SoftReference cacheref = new SoftReference(null); | ||
| 146 | |||
| 147 | private SunLayoutEngine(LayoutEngineKey key) { | ||
| 148 | this.key = key; | ||
| 149 | } | ||
| 150 | |||
| 151 | public void layout(FontStrikeDesc desc, float[] mat, int gmask, | ||
| 152 | int baseIndex, TextRecord tr, int typo_flags, | ||
| 153 | Point2D.Float pt, GVData data) { | ||
| 154 | Font2D font = key.font(); | ||
| 155 | FontStrike strike = font.getStrike(desc); | ||
| 156 | long layoutTables = 0; | ||
| 157 | if (font instanceof TrueTypeFont) { | ||
| 158 | layoutTables = ((TrueTypeFont) font).getLayoutTableCache(); | ||
| 159 | } | ||
| 160 | nativeLayout(font, strike, mat, gmask, baseIndex, | ||
| 161 | tr.text, tr.start, tr.limit, tr.min, tr.max, | ||
| 162 | key.script(), key.lang(), typo_flags, pt, data, | ||
| 163 | font.getUnitsPerEm(), layoutTables); | ||
| 164 | } | ||
| 165 | |||
| 166 | private static native void | ||
| 167 | nativeLayout(Font2D font, FontStrike strike, float[] mat, int gmask, | ||
| 168 | int baseIndex, char[] chars, int offset, int limit, | ||
| 169 | int min, int max, int script, int lang, int typo_flags, | ||
| 170 | Point2D.Float pt, GVData data, long upem, long layoutTables); | ||
| 171 | } | ||