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| 1 | /* | ||
| 2 | * Copyright (c) 2003, 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.geom.AffineTransform; | ||
| 29 | import java.awt.geom.Point2D; | ||
| 30 | |||
| 31 | /* These are font metrics: they are in user space, not device space. | ||
| 32 | * Hence they are not truly "strike" metrics. However it is convenient to | ||
| 33 | * treat them as such since we need to have a scaler context to obtain them | ||
| 34 | * and also to cache them. The old implementation obtained a C++ strike object | ||
| 35 | * that matched the Font TX + pt size only. It was wasteful of strike objects. | ||
| 36 | * This new implementation still has separate StrikeMetrics for 2 fonts that | ||
| 37 | * are really the same but are used in different device transforms, but at | ||
| 38 | * least it doesn't create a whole new strike just to get the metrics for | ||
| 39 | * a strike in a transformed graphics. | ||
| 40 | * So these metrics do not take into account the device transform. They | ||
| 41 | * are considered inherent properties of the font. Hence it may be that we | ||
| 42 | * should use the device transform to obtain the most accurate metrics, but | ||
| 43 | * typically 1.1 APIs do not provide for this. So some APIs may want to | ||
| 44 | * ignore the dev. tx and others may want to use it, and then apply an | ||
| 45 | * inverse transform. For now we ignore the dev. tx. | ||
| 46 | * "Font" metrics are representative of a typical glyph in the font. | ||
| 47 | * Generally speaking these values are the choice of the font designer and | ||
| 48 | * are stored in the font, from which we retrieve the values. They do | ||
| 49 | * not necessarily equate to the maximum bounds of all glyphs in the font. | ||
| 50 | * Note that the ascent fields are typically a -ve value as we use a top-left | ||
| 51 | * origin user space, and text is positioned relative to its baseline. | ||
| 52 | */ | ||
| 53 | public final class StrikeMetrics { | ||
| 54 | |||
| 55 | public float ascentX; | ||
| 56 | public float ascentY; | ||
| 57 | public float descentX; | ||
| 58 | public float descentY; | ||
| 59 | public float baselineX; | ||
| 60 | public float baselineY; | ||
| 61 | public float leadingX; | ||
| 62 | public float leadingY; | ||
| 63 | public float maxAdvanceX; | ||
| 64 | public float maxAdvanceY; | ||
| 65 | |||
| 66 | |||
| 67 | /* The no-args constructor is used by CompositeStrike, which then | ||
| 68 | * merges in the metrics of physical fonts. | ||
| 69 | * The approach here is the same as earlier releases but it is flawed | ||
| 70 | * take for example the following which ignores leading for simplicity. | ||
| 71 | * Say we have a composite with an element asc=-9, dsc=2, and another with | ||
| 72 | * asc=-7, dsc=3. The merged font is (-9,3) for height of -(-9)+3=12. | ||
| 73 | * Suppose this same font has been derived with a 180% rotation | ||
| 74 | * Now its signs for ascent/descent are reversed. Its (9,-2) and (7,-3) | ||
| 75 | * Its merged values are (using the code in this class) (7,-2) for | ||
| 76 | * a height of -(7)+-2 = =-9! | ||
| 77 | * We need to have a more intelligent merging algorithm, | ||
| 78 | * which so far as I can see needs to apply an inverse of the font | ||
| 79 | * tx, do its merging, and then reapply the font tx. | ||
| 80 | * This wouldn't often be a problem as there rarely is a font TX, and | ||
| 81 | * the tricky part is getting the information. Probably the no-args | ||
| 82 | * constructor needs to pass a TX in to be applied to all merges. | ||
| 83 | * CompositeStrike would be left with the problem of figuring out what | ||
| 84 | * tx to use. | ||
| 85 | * But at least for now we are probably no worse than 1.4 ... | ||
| 86 | * REMIND: FIX THIS. | ||
| 87 | */ | ||
| 88 | StrikeMetrics() { | ||
| 89 | ascentX = ascentY = Integer.MAX_VALUE; | ||
| 90 | descentX = descentY = leadingX = leadingY = Integer.MIN_VALUE; | ||
| 91 | baselineX = baselineX = maxAdvanceX = maxAdvanceY = Integer.MIN_VALUE; | ||
| 92 | } | ||
| 93 | |||
| 94 | StrikeMetrics(float ax, float ay, float dx, float dy, float bx, float by, | ||
| 95 | float lx, float ly, float mx, float my) { | ||
| 96 | ascentX = ax; | ||
| 97 | ascentY = ay; | ||
| 98 | descentX = dx; | ||
| 99 | descentY = dy; | ||
| 100 | baselineX = bx; | ||
| 101 | baselineY = by; | ||
| 102 | leadingX = lx; | ||
| 103 | leadingY = ly; | ||
| 104 | maxAdvanceX = mx; | ||
| 105 | maxAdvanceY = my; | ||
| 106 | } | ||
| 107 | |||
| 108 | public float getAscent() { | ||
| 109 | return -ascentY; | ||
| 110 | } | ||
| 111 | |||
| 112 | public float getDescent() { | ||
| 113 | return descentY; | ||
| 114 | } | ||
| 115 | |||
| 116 | public float getLeading() { | ||
| 117 | return leadingY; | ||
| 118 | } | ||
| 119 | |||
| 120 | public float getMaxAdvance() { | ||
| 121 | return maxAdvanceX; | ||
| 122 | } | ||
| 123 | |||
| 124 | /* | ||
| 125 | * Currently only used to merge together slot metrics to create | ||
| 126 | * the metrics for a composite font. | ||
| 127 | */ | ||
| 128 | void merge(StrikeMetrics other) { | ||
| 129 | if (other == null) { | ||
| 130 | return; | ||
| 131 | } | ||
| 132 | if (other.ascentX < ascentX) { | ||
| 133 | ascentX = other.ascentX; | ||
| 134 | } | ||
| 135 | if (other.ascentY < ascentY) { | ||
| 136 | ascentY = other.ascentY; | ||
| 137 | } | ||
| 138 | if (other.descentX > descentX) { | ||
| 139 | descentX = other.descentX; | ||
| 140 | } | ||
| 141 | if (other.descentY > descentY) { | ||
| 142 | descentY = other.descentY; | ||
| 143 | } | ||
| 144 | if (other.baselineX > baselineX) { | ||
| 145 | baselineX = other.baselineX; | ||
| 146 | } | ||
| 147 | if (other.baselineY > baselineY) { | ||
| 148 | baselineY = other.baselineY; | ||
| 149 | } | ||
| 150 | if (other.leadingX > leadingX) { | ||
| 151 | leadingX = other.leadingX; | ||
| 152 | } | ||
| 153 | if (other.leadingY > leadingY) { | ||
| 154 | leadingY = other.leadingY; | ||
| 155 | } | ||
| 156 | if (other.maxAdvanceX > maxAdvanceX) { | ||
| 157 | maxAdvanceX = other.maxAdvanceX; | ||
| 158 | } | ||
| 159 | if (other.maxAdvanceY > maxAdvanceY) { | ||
| 160 | maxAdvanceY = other.maxAdvanceY; | ||
| 161 | } | ||
| 162 | } | ||
| 163 | |||
| 164 | /* Used to transform the values back into user space. | ||
| 165 | * This is done ONCE by the strike so clients should not need | ||
| 166 | * to worry about this | ||
| 167 | */ | ||
| 168 | void convertToUserSpace(AffineTransform invTx) { | ||
| 169 | Point2D.Float pt2D = new Point2D.Float(); | ||
| 170 | |||
| 171 | pt2D.x = ascentX; pt2D.y = ascentY; | ||
| 172 | invTx.deltaTransform(pt2D, pt2D); | ||
| 173 | ascentX = pt2D.x; ascentY = pt2D.y; | ||
| 174 | |||
| 175 | pt2D.x = descentX; pt2D.y = descentY; | ||
| 176 | invTx.deltaTransform(pt2D, pt2D); | ||
| 177 | descentX = pt2D.x; descentY = pt2D.y; | ||
| 178 | |||
| 179 | pt2D.x = baselineX; pt2D.y = baselineY; | ||
| 180 | invTx.deltaTransform(pt2D, pt2D); | ||
| 181 | baselineX = pt2D.x; baselineY = pt2D.y; | ||
| 182 | |||
| 183 | pt2D.x = leadingX; pt2D.y = leadingY; | ||
| 184 | invTx.deltaTransform(pt2D, pt2D); | ||
| 185 | leadingX = pt2D.x; leadingY = pt2D.y; | ||
| 186 | |||
| 187 | pt2D.x = maxAdvanceX; pt2D.y = maxAdvanceY; | ||
| 188 | invTx.deltaTransform(pt2D, pt2D); | ||
| 189 | maxAdvanceX = pt2D.x; maxAdvanceY = pt2D.y; | ||
| 190 | } | ||
| 191 | |||
| 192 | public String toString() { | ||
| 193 | return "ascent:x=" + ascentX + " y=" + ascentY + | ||
| 194 | " descent:x=" + descentX + " y=" + descentY + | ||
| 195 | " baseline:x=" + baselineX + " y=" + baselineY + | ||
| 196 | " leading:x=" + leadingX + " y=" + leadingY + | ||
| 197 | " maxAdvance:x=" + maxAdvanceX + " y=" + maxAdvanceY; | ||
| 198 | } | ||
| 199 | } | ||