1 /*
2 * Copyright (c) 2013, 2014, 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 com.sun.javafx.font.coretext;
27
28 import com.sun.javafx.font.DisposerRecord;
29 import com.sun.javafx.font.FontResource;
30 import com.sun.javafx.font.FontStrikeDesc;
31 import com.sun.javafx.font.Glyph;
32 import com.sun.javafx.font.PrismFontFactory;
33 import com.sun.javafx.font.PrismFontStrike;
34 import com.sun.javafx.geom.Path2D;
35 import com.sun.javafx.geom.Point2D;
36 import com.sun.javafx.geom.transform.BaseTransform;
37
38 class CTFontStrike extends PrismFontStrike<CTFontFile> {
39
40 private long fontRef;
41 CGAffineTransform matrix;
42 /* CoreText uses different precision for subpixel text according
43 * to the font size. By observation, font sizes smaller than 12
44 * have 4 subpixel positions. Between 12 and 17 it decreases to 3.
45 * Between 18 and 33 it is only 2. Above 33 it rounds all positions
46 * to integral values.
47 */
48 static final float SUBPIXEL4_SIZE = 12;
49 static final float SUBPIXEL3_SIZE = 18;
50 static final float SUBPIXEL2_SIZE = 34;
51 private static final boolean SUBPIXEL;
52 static {
53 int mode = PrismFontFactory.getFontFactory().getSubPixelMode();
54 SUBPIXEL = (mode & PrismFontFactory.SUB_PIXEL_ON) != 0;
55 }
56
57 CTFontStrike(CTFontFile fontResource, float size,
58 BaseTransform graphicsTransform, int aaMode,
59 FontStrikeDesc desc) {
60 super(fontResource, size, graphicsTransform, aaMode, desc);
61 float maxDim = PrismFontFactory.getFontSizeLimit();
62 if (graphicsTransform.isTranslateOrIdentity()) {
63 drawShapes = size > maxDim;
64 } else {
65 BaseTransform tx2d = getTransform();
66 matrix = new CGAffineTransform();
67 matrix.a = tx2d.getMxx();
68 matrix.b = -tx2d.getMyx(); /*Inverted coordinates system */
69 matrix.c = -tx2d.getMxy(); /*Inverted coordinates system */
70 matrix.d = tx2d.getMyy();
71
72 if (Math.abs(matrix.a * size) > maxDim ||
73 Math.abs(matrix.b * size) > maxDim ||
74 Math.abs(matrix.c * size) > maxDim ||
75 Math.abs(matrix.d * size) > maxDim)
76 {
77 drawShapes = true;
78 }
79 }
80 long psNameRef = OS.CFStringCreate(fontResource.getPSName());
81 if (psNameRef != 0) {
82 fontRef = OS.CTFontCreateWithName(psNameRef, size, matrix);
83 OS.CFRelease(psNameRef);
84 }
85 if (fontRef == 0) {
86 if (PrismFontFactory.debugFonts) {
87 System.err.println("Failed to create CTFont for " + this);
88 }
89 }
90 }
91
92 long getFontRef() {
93 return fontRef;
94 }
95
96 @Override protected DisposerRecord createDisposer(FontStrikeDesc desc) {
97 CTFontFile fontResource = getFontResource();
98 return new CTStrikeDisposer(fontResource, desc, fontRef);
99 }
100
101 @Override protected Glyph createGlyph(int glyphCode) {
102 return new CTGlyph(this, glyphCode, drawShapes);
103 }
104
105 @Override
106 public int getQuantizedPosition(Point2D point) {
107 if (SUBPIXEL && matrix == null) {
108 /* Prism only produces 3 position, so for sizes smaller than 12 use
109 * Coretext for LCD and grayscale text
110 */
111 if (getSize() < SUBPIXEL4_SIZE) {
112 float subPixelX = point.x;
113 point.x = (int) point.x;
114 subPixelX -= point.x;
115 point.y = (float) Math.round(point.y);
116 if (subPixelX >= 0.75f) return 3;
117 if (subPixelX >= 0.50f) return 2;
118 if (subPixelX >= 0.25f) return 1;
119 return 0;
120 }
121 if (getAAMode() == FontResource.AA_GREYSCALE) {
122 if (getSize() < SUBPIXEL3_SIZE) {
123 float subPixelX = point.x;
124 point.x = (int) point.x;
125 subPixelX -= point.x;
126 point.y = (float) Math.round(point.y);
127 if (subPixelX >= 0.66f) return 2;
128 if (subPixelX >= 0.33f) return 1;
129 return 0;
130 }
131 if (getSize() < SUBPIXEL2_SIZE) {
132 float subPixelX = point.x;
133 point.x = (int) point.x;
134 subPixelX -= point.x;
135 point.y = (float) Math.round(point.y);
136 if (subPixelX >= 0.5f) return 1;
137 }
138 return 0;
139 }
140 }
141 return super.getQuantizedPosition(point);
142 }
143
144 float getSubPixelPosition(int index) {
145 if (index == 0) return 0;
146 float size = getSize();
147 if (size < SUBPIXEL4_SIZE) {
148 if (index == 3) return 0.75f;
149 if (index == 2) return 0.50f;
150 if (index == 1) return 0.25f;
151 return 0;
152 }
153 if (getAAMode() == FontResource.AA_LCD) return 0;
154 if (size < SUBPIXEL3_SIZE) {
155 if (index == 2) return 0.66f;
156 if (index == 1) return 0.33f;
157 return 0;
158 }
159 if (size < SUBPIXEL2_SIZE) {
160 if (index == 1) return 0.50f;
161 }
162 return 0;
163 }
164
165 boolean isSubPixelGlyph() {
166 return SUBPIXEL && matrix == null;
167 }
168
169 @Override protected Path2D createGlyphOutline(int glyphCode) {
170 CTFontFile fontResource = getFontResource();
171 return fontResource.getGlyphOutline(glyphCode, getSize());
172 }
173
174 CGRect getBBox(int glyphCode) {
175 CTFontFile fontResource = getFontResource();
176 return fontResource.getBBox(glyphCode, getSize());
177 }
178 }