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| 1 | +/* | |
| 2 | + * Copyright (c) 2003, 2005, 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.awt.Font; | |
| 29 | +import java.awt.font.FontRenderContext; | |
| 30 | +import java.awt.geom.AffineTransform; | |
| 31 | +import static sun.awt.SunHints.*; | |
| 32 | + | |
| 33 | +/* | |
| 34 | + * This class encapsulates every thing needed that distinguishes a strike. | |
| 35 | + * It can be used as a key to locate a FontStrike in a Hashmap/cache. | |
| 36 | + * It is not mutatable, but contains mutatable AffineTransform objects, | |
| 37 | + * which for performance reasons it does not keep private copies of. | |
| 38 | + * Therefore code constructing these must pass in transforms it guarantees | |
| 39 | + * not to mutate. | |
| 40 | + */ | |
| 41 | +public class FontStrikeDesc { | |
| 42 | + | |
| 43 | + /* Values to use as a mask that is used for faster comparison of | |
| 44 | + * two strikes using just an int equality test. | |
| 45 | + * The ones we don't use are listed here but commented out. | |
| 46 | + * ie style is already built and hint "OFF" values are zero. | |
| 47 | + * Note that this is used as a strike key and the same strike is used | |
| 48 | + * for HRGB and HBGR, so only the orientation needed (H or V) is needed | |
| 49 | + * to construct and distinguish a FontStrikeDesc. The rgb ordering | |
| 50 | + * needed for rendering is stored in the graphics state. | |
| 51 | + */ | |
| 52 | +// static final int STYLE_PLAIN = Font.PLAIN; // 0x0000 | |
| 53 | +// static final int STYLE_BOLD = Font.BOLD; // 0x0001 | |
| 54 | +// static final int STYLE_ITALIC = Font.ITALIC; // 0x0002 | |
| 55 | +// static final int STYLE_BOLDITALIC = Font.BOLD|Font.ITALIC; // 0x0003 | |
| 56 | +// static final int AA_OFF = 0x0000; | |
| 57 | + static final int AA_ON = 0x0010; | |
| 58 | + static final int AA_LCD_H = 0x0020; | |
| 59 | + static final int AA_LCD_V = 0x0040; | |
| 60 | +// static final int FRAC_METRICS_OFF = 0x0000; | |
| 61 | + static final int FRAC_METRICS_ON = 0x0100; | |
| 62 | + static final int FRAC_METRICS_SP = 0x0200; | |
| 63 | + | |
| 64 | + /* devTx is to get an inverse transform to get user space values | |
| 65 | + * for metrics. Its not used otherwise, as the glyphTx is the important | |
| 66 | + * one. But it does mean that a strike representing a 6pt font and identity | |
| 67 | + * graphics transform is not equal to one for a 12 pt font and 2x scaled | |
| 68 | + * graphics transform. Its likely to be very rare that this causes | |
| 69 | + * duplication. | |
| 70 | + */ | |
| 71 | + AffineTransform devTx; | |
| 72 | + AffineTransform glyphTx; // all of ptSize, Font tx and Graphics tx. | |
| 73 | + int style; | |
| 74 | + int aaHint; | |
| 75 | + int fmHint; | |
| 76 | + private int hashCode; | |
| 77 | + private int valuemask; | |
| 78 | + | |
| 79 | + public int hashCode() { | |
| 80 | + /* Can cache hashcode since a strike(desc) is immutable.*/ | |
| 81 | + if (hashCode == 0) { | |
| 82 | + hashCode = glyphTx.hashCode() + devTx.hashCode() + valuemask; | |
| 83 | + } | |
| 84 | + return hashCode; | |
| 85 | + } | |
| 86 | + | |
| 87 | + public boolean equals(Object obj) { | |
| 88 | + try { | |
| 89 | + FontStrikeDesc desc = (FontStrikeDesc)obj; | |
| 90 | + return (desc.valuemask == this.valuemask && | |
| 91 | + desc.glyphTx.equals(this.glyphTx) && | |
| 92 | + desc.devTx.equals(this.devTx)); | |
| 93 | + } catch (Exception e) { | |
| 94 | + /* class cast or NP exceptions should not happen often, if ever, | |
| 95 | + * and I am hoping that this is faster than an instanceof check. | |
| 96 | + */ | |
| 97 | + return false; | |
| 98 | + } | |
| 99 | + } | |
| 100 | + | |
| 101 | + FontStrikeDesc() { | |
| 102 | + // used with init | |
| 103 | + } | |
| 104 | + | |
| 105 | + | |
| 106 | + /* This maps a public text AA hint value into one of the subset of values | |
| 107 | + * used to index strikes. For the purpose of the strike cache there are | |
| 108 | + * only 4 values : OFF, ON, LCD_HRGB, LCD_VRGB. | |
| 109 | + * Font and ptSize are needed to resolve the 'gasp' table. The ptSize | |
| 110 | + * must therefore include device and font transforms. | |
| 111 | + */ | |
| 112 | + public static int getAAHintIntVal(Object aa, Font2D font2D, int ptSize) { | |
| 113 | + if (aa == VALUE_TEXT_ANTIALIAS_OFF || | |
| 114 | + aa == VALUE_TEXT_ANTIALIAS_DEFAULT) { | |
| 115 | + return INTVAL_TEXT_ANTIALIAS_OFF; | |
| 116 | + } else if (aa == VALUE_TEXT_ANTIALIAS_ON) { | |
| 117 | + return INTVAL_TEXT_ANTIALIAS_ON; | |
| 118 | + } else if (aa == VALUE_TEXT_ANTIALIAS_GASP) { | |
| 119 | + if (font2D.useAAForPtSize(ptSize)) { | |
| 120 | + return INTVAL_TEXT_ANTIALIAS_ON; | |
| 121 | + } else { | |
| 122 | + return INTVAL_TEXT_ANTIALIAS_OFF; | |
| 123 | + } | |
| 124 | + } else if (aa == VALUE_TEXT_ANTIALIAS_LCD_HRGB || | |
| 125 | + aa == VALUE_TEXT_ANTIALIAS_LCD_HBGR) { | |
| 126 | + return INTVAL_TEXT_ANTIALIAS_LCD_HRGB; | |
| 127 | + } else if (aa == VALUE_TEXT_ANTIALIAS_LCD_VRGB || | |
| 128 | + aa == VALUE_TEXT_ANTIALIAS_LCD_VBGR) { | |
| 129 | + return INTVAL_TEXT_ANTIALIAS_LCD_VRGB; | |
| 130 | + } else { | |
| 131 | + return INTVAL_TEXT_ANTIALIAS_OFF; | |
| 132 | + } | |
| 133 | + } | |
| 134 | + | |
| 135 | + /* This maps a public text AA hint value into one of the subset of values | |
| 136 | + * used to index strikes. For the purpose of the strike cache there are | |
| 137 | + * only 4 values : OFF, ON, LCD_HRGB, LCD_VRGB. | |
| 138 | + * Font and FontRenderContext are needed to resolve the 'gasp' table. | |
| 139 | + * This is similar to the method above, but used by callers which have not | |
| 140 | + * already calculated the glyph device point size. | |
| 141 | + */ | |
| 142 | + public static int getAAHintIntVal(Font2D font2D, Font font, | |
| 143 | + FontRenderContext frc) { | |
| 144 | + Object aa = frc.getAntiAliasingHint(); | |
| 145 | + if (aa == VALUE_TEXT_ANTIALIAS_OFF || | |
| 146 | + aa == VALUE_TEXT_ANTIALIAS_DEFAULT) { | |
| 147 | + return INTVAL_TEXT_ANTIALIAS_OFF; | |
| 148 | + } else if (aa == VALUE_TEXT_ANTIALIAS_ON) { | |
| 149 | + return INTVAL_TEXT_ANTIALIAS_ON; | |
| 150 | + } else if (aa == VALUE_TEXT_ANTIALIAS_GASP) { | |
| 151 | + /* FRC.isIdentity() would have been useful */ | |
| 152 | + int ptSize; | |
| 153 | + AffineTransform tx = frc.getTransform(); | |
| 154 | + if (tx.isIdentity() && !font.isTransformed()) { | |
| 155 | + ptSize = font.getSize(); | |
| 156 | + } else { | |
| 157 | + /* one or both transforms is not identity */ | |
| 158 | + float size = font.getSize2D(); | |
| 159 | + if (tx.isIdentity()) { | |
| 160 | + tx = font.getTransform(); | |
| 161 | + tx.scale(size, size); | |
| 162 | + } else { | |
| 163 | + tx.scale(size, size); | |
| 164 | + if (font.isTransformed()) { | |
| 165 | + tx.concatenate(font.getTransform()); | |
| 166 | + } | |
| 167 | + } | |
| 168 | + double shearx = tx.getShearX(); | |
| 169 | + double scaley = tx.getScaleY(); | |
| 170 | + if (shearx != 0) { | |
| 171 | + scaley = Math.sqrt(shearx * shearx + scaley * scaley); | |
| 172 | + } | |
| 173 | + ptSize = (int)(Math.abs(scaley)+0.5); | |
| 174 | + } | |
| 175 | + if (font2D.useAAForPtSize(ptSize)) { | |
| 176 | + return INTVAL_TEXT_ANTIALIAS_ON; | |
| 177 | + } else { | |
| 178 | + return INTVAL_TEXT_ANTIALIAS_OFF; | |
| 179 | + } | |
| 180 | + } else if (aa == VALUE_TEXT_ANTIALIAS_LCD_HRGB || | |
| 181 | + aa == VALUE_TEXT_ANTIALIAS_LCD_HBGR) { | |
| 182 | + return INTVAL_TEXT_ANTIALIAS_LCD_HRGB; | |
| 183 | + } else if (aa == VALUE_TEXT_ANTIALIAS_LCD_VRGB || | |
| 184 | + aa == VALUE_TEXT_ANTIALIAS_LCD_VBGR) { | |
| 185 | + return INTVAL_TEXT_ANTIALIAS_LCD_VRGB; | |
| 186 | + } else { | |
| 187 | + return INTVAL_TEXT_ANTIALIAS_OFF; | |
| 188 | + } | |
| 189 | + } | |
| 190 | + | |
| 191 | + public static int getFMHintIntVal(Object fm) { | |
| 192 | + if (fm == VALUE_FRACTIONALMETRICS_OFF || | |
| 193 | + fm == VALUE_FRACTIONALMETRICS_DEFAULT) { | |
| 194 | + return INTVAL_FRACTIONALMETRICS_OFF; | |
| 195 | + } else { | |
| 196 | + return INTVAL_FRACTIONALMETRICS_ON; | |
| 197 | + } | |
| 198 | + } | |
| 199 | + | |
| 200 | + public FontStrikeDesc(AffineTransform devAt, AffineTransform at, | |
| 201 | + int fStyle, int aa, int fm) { | |
| 202 | + devTx = devAt; | |
| 203 | + glyphTx = at; // not cloning glyphTx. Callers trusted to not mutate it. | |
| 204 | + style = fStyle; | |
| 205 | + aaHint = aa; | |
| 206 | + fmHint = fm; | |
| 207 | + valuemask = fStyle; | |
| 208 | + switch (aa) { | |
| 209 | + case INTVAL_TEXT_ANTIALIAS_OFF : | |
| 210 | + break; | |
| 211 | + case INTVAL_TEXT_ANTIALIAS_ON : | |
| 212 | + valuemask |= AA_ON; | |
| 213 | + break; | |
| 214 | + case INTVAL_TEXT_ANTIALIAS_LCD_HRGB : | |
| 215 | + case INTVAL_TEXT_ANTIALIAS_LCD_HBGR : | |
| 216 | + valuemask |= AA_LCD_H; | |
| 217 | + break; | |
| 218 | + case INTVAL_TEXT_ANTIALIAS_LCD_VRGB : | |
| 219 | + case INTVAL_TEXT_ANTIALIAS_LCD_VBGR : | |
| 220 | + valuemask |= AA_LCD_V; | |
| 221 | + break; | |
| 222 | + default: break; | |
| 223 | + } | |
| 224 | + if (fm == INTVAL_FRACTIONALMETRICS_ON) { | |
| 225 | + valuemask |= FRAC_METRICS_ON; | |
| 226 | + } | |
| 227 | + } | |
| 228 | + | |
| 229 | + FontStrikeDesc(FontStrikeDesc desc) { | |
| 230 | + devTx = desc.devTx; | |
| 231 | + // Clone the TX in this case as this is called when its known | |
| 232 | + // that "desc" is being re-used by its creator. | |
| 233 | + glyphTx = (AffineTransform)desc.glyphTx.clone(); | |
| 234 | + style = desc.style; | |
| 235 | + aaHint = desc.aaHint; | |
| 236 | + fmHint = desc.fmHint; | |
| 237 | + hashCode = desc.hashCode; | |
| 238 | + valuemask = desc.valuemask; | |
| 239 | + } | |
| 240 | + | |
| 241 | + | |
| 242 | + public String toString() { | |
| 243 | + return "FontStrikeDesc: Style="+style+ " AA="+aaHint+ " FM="+fmHint+ | |
| 244 | + " devTx="+devTx+ " devTx.FontTx.ptSize="+glyphTx; | |
| 245 | + } | |
| 246 | +} | |