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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 | +} | |