J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2003-2005 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package sun.font; |
| 27 | |
| 28 | import java.awt.Font; |
| 29 | import java.awt.Rectangle; |
| 30 | import java.awt.geom.GeneralPath; |
| 31 | import java.awt.geom.Point2D; |
| 32 | import java.awt.geom.Rectangle2D; |
| 33 | |
| 34 | /* |
| 35 | * performance: |
| 36 | * it seems expensive that when using a composite font for |
| 37 | * every char you have to find which "slot" can display it. |
| 38 | * Just the fact that you need to check at all .. |
| 39 | * A composite glyph code ducks this by encoding the slot into the |
| 40 | * glyph code, but you still need to get from char to glyph code. |
| 41 | */ |
| 42 | public final class CompositeStrike extends FontStrike { |
| 43 | |
| 44 | static final int SLOTMASK = 0xffffff; |
| 45 | |
| 46 | private CompositeFont compFont; |
| 47 | private PhysicalStrike[] strikes; |
| 48 | int numGlyphs = 0; |
| 49 | |
| 50 | CompositeStrike(CompositeFont font2D, FontStrikeDesc desc) { |
| 51 | this.compFont = font2D; |
| 52 | this.desc = desc; |
| 53 | this.disposer = new FontStrikeDisposer(compFont, desc); |
| 54 | if (desc.style != compFont.style) { |
| 55 | algoStyle = true; |
| 56 | if ((desc.style & Font.BOLD) == Font.BOLD && |
| 57 | ((compFont.style & Font.BOLD) == 0)) { |
| 58 | boldness = 1.33f; |
| 59 | } |
| 60 | if ((desc.style & Font.ITALIC) == Font.ITALIC && |
| 61 | (compFont.style & Font.ITALIC) == 0) { |
| 62 | italic = 0.7f; |
| 63 | } |
| 64 | } |
| 65 | strikes = new PhysicalStrike[compFont.numSlots]; |
| 66 | } |
| 67 | |
| 68 | /* do I need this (see Strike::compositeStrikeForGlyph) */ |
| 69 | PhysicalStrike getStrikeForGlyph(int glyphCode) { |
| 70 | return getStrikeForSlot(glyphCode >>> 24); |
| 71 | } |
| 72 | |
| 73 | PhysicalStrike getStrikeForSlot(int slot) { |
| 74 | |
| 75 | PhysicalStrike strike = strikes[slot]; |
| 76 | if (strike == null) { |
| 77 | strike = |
| 78 | (PhysicalStrike)(compFont.getSlotFont(slot).getStrike(desc)); |
| 79 | |
| 80 | strikes[slot] = strike; |
| 81 | } |
| 82 | return strike; |
| 83 | } |
| 84 | |
| 85 | public int getNumGlyphs() { |
| 86 | return compFont.getNumGlyphs(); |
| 87 | } |
| 88 | |
| 89 | StrikeMetrics getFontMetrics() { |
| 90 | if (strikeMetrics == null) { |
| 91 | StrikeMetrics compMetrics = new StrikeMetrics(); |
| 92 | for (int s=0; s<compFont.numMetricsSlots; s++) { |
| 93 | compMetrics.merge(getStrikeForSlot(s).getFontMetrics()); |
| 94 | } |
| 95 | strikeMetrics = compMetrics; |
| 96 | } |
| 97 | return strikeMetrics; |
| 98 | } |
| 99 | |
| 100 | |
| 101 | /* Performance tweak: Slot 0 can often return all the glyphs |
| 102 | * Note slot zero doesn't need to be masked. |
| 103 | * Could go a step further and support getting a run of glyphs. |
| 104 | * This would help many locales a little. |
| 105 | * |
| 106 | * Note that if a client constructs an invalid a composite glyph that |
| 107 | * references an invalid slot, that the behaviour is currently |
| 108 | * that this slot index falls through to CompositeFont.getSlotFont(int) |
| 109 | * which will substitute a default font, from which to obtain the |
| 110 | * strike. If its an invalid glyph code for a valid slot, then the |
| 111 | * physical font for that slot will substitute the missing glyph. |
| 112 | */ |
| 113 | void getGlyphImagePtrs(int[] glyphCodes, long[] images, int len) { |
| 114 | PhysicalStrike strike = getStrikeForSlot(0); |
| 115 | int numptrs = strike.getSlot0GlyphImagePtrs(glyphCodes, images, len); |
| 116 | if (numptrs == len) { |
| 117 | return; |
| 118 | } |
| 119 | for (int i=numptrs; i< len; i++) { |
| 120 | strike = getStrikeForGlyph(glyphCodes[i]); |
| 121 | images[i] = strike.getGlyphImagePtr(glyphCodes[i] & SLOTMASK); |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | |
| 126 | long getGlyphImagePtr(int glyphCode) { |
| 127 | PhysicalStrike strike = getStrikeForGlyph(glyphCode); |
| 128 | return strike.getGlyphImagePtr(glyphCode & SLOTMASK); |
| 129 | } |
| 130 | |
| 131 | void getGlyphImageBounds(int glyphCode, Point2D.Float pt, Rectangle result) { |
| 132 | PhysicalStrike strike = getStrikeForGlyph(glyphCode); |
| 133 | strike.getGlyphImageBounds(glyphCode & SLOTMASK, pt, result); |
| 134 | } |
| 135 | |
| 136 | Point2D.Float getGlyphMetrics(int glyphCode) { |
| 137 | PhysicalStrike strike = getStrikeForGlyph(glyphCode); |
| 138 | return strike.getGlyphMetrics(glyphCode & SLOTMASK); |
| 139 | } |
| 140 | |
| 141 | Point2D.Float getCharMetrics(char ch) { |
| 142 | return getGlyphMetrics(compFont.getMapper().charToGlyph(ch)); |
| 143 | } |
| 144 | |
| 145 | float getGlyphAdvance(int glyphCode) { |
| 146 | PhysicalStrike strike = getStrikeForGlyph(glyphCode); |
| 147 | return strike.getGlyphAdvance(glyphCode & SLOTMASK); |
| 148 | } |
| 149 | |
| 150 | /* REMIND where to cache? |
| 151 | * The glyph advance is already cached by physical strikes and that's a lot |
| 152 | * of the work. |
| 153 | * Also FontDesignMetrics maintains a latin char advance cache, so don't |
| 154 | * cache advances here as apps tend to hold onto metrics objects when |
| 155 | * performance is sensitive to it. Revisit this assumption later. |
| 156 | */ |
| 157 | float getCodePointAdvance(int cp) { |
| 158 | return getGlyphAdvance(compFont.getMapper().charToGlyph(cp)); |
| 159 | } |
| 160 | |
| 161 | Rectangle2D.Float getGlyphOutlineBounds(int glyphCode) { |
| 162 | PhysicalStrike strike = getStrikeForGlyph(glyphCode); |
| 163 | return strike.getGlyphOutlineBounds(glyphCode & SLOTMASK); |
| 164 | } |
| 165 | |
| 166 | GeneralPath getGlyphOutline(int glyphCode, float x, float y) { |
| 167 | |
| 168 | PhysicalStrike strike = getStrikeForGlyph(glyphCode); |
| 169 | GeneralPath path = strike.getGlyphOutline(glyphCode & SLOTMASK, x, y); |
| 170 | if (path == null) { |
| 171 | return new GeneralPath(); |
| 172 | } else { |
| 173 | return path; |
| 174 | } |
| 175 | } |
| 176 | |
| 177 | /* The physical font slot for each glyph is encoded in the glyph ID |
| 178 | * To be as efficient as possible we find a run of glyphs from the |
| 179 | * same slot and create a temporary array of these glyphs decoded |
| 180 | * to the slot. The slot font is then queried for the GeneralPath |
| 181 | * for that run of glyphs. GeneralPaths from each run are appended |
| 182 | * to create the shape for the whole glyph array. |
| 183 | */ |
| 184 | GeneralPath getGlyphVectorOutline(int[] glyphs, float x, float y) { |
| 185 | GeneralPath path = null; |
| 186 | GeneralPath gp; |
| 187 | int glyphIndex = 0; |
| 188 | int[] tmpGlyphs; |
| 189 | |
| 190 | while (glyphIndex < glyphs.length) { |
| 191 | int start = glyphIndex; |
| 192 | int slot = glyphs[glyphIndex] >>> 24; |
| 193 | while (glyphIndex < glyphs.length && |
| 194 | (glyphs[glyphIndex+1] >>> 24) == slot) { |
| 195 | glyphIndex++; |
| 196 | } |
| 197 | int tmpLen = glyphIndex-start+1; |
| 198 | tmpGlyphs = new int[tmpLen]; |
| 199 | for (int i=0;i<tmpLen;i++) { |
| 200 | tmpGlyphs[i] = glyphs[i] & SLOTMASK; |
| 201 | } |
| 202 | gp = getStrikeForSlot(slot).getGlyphVectorOutline(tmpGlyphs, x, y); |
| 203 | if (path == null) { |
| 204 | path = gp; |
| 205 | } else if (gp != null) { |
| 206 | path.append(gp, false); |
| 207 | } |
| 208 | } |
| 209 | if (path == null) { |
| 210 | return new GeneralPath(); |
| 211 | } else { |
| 212 | return path; |
| 213 | } |
| 214 | } |
| 215 | } |