1 /*
2 * Copyright (c) 2000, 2018, 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.java2d.pipe;
27
28 import java.awt.font.FontRenderContext;
29 import java.awt.font.GlyphVector;
30 import java.awt.font.TextLayout;
31 import sun.java2d.SunGraphics2D;
32 import sun.awt.SunHints;
33
34 import java.awt.Shape;
35 import java.awt.geom.AffineTransform;
36 import java.awt.font.TextLayout;
37
38 /**
39 * A delegate pipe of SG2D for drawing "large" text with
40 * a solid source colour to an opaque destination.
41 * The text is drawn as a filled outline.
42 * Since the developer is not explicitly requesting this way of
43 * rendering, this should not be used if the current paint is not
44 * a solid colour.
45 *
46 * If text anti-aliasing is requested by the application, and
47 * filling path, an anti-aliasing fill pipe needs to
48 * be invoked.
49 * This involves making some of the same decisions as in the
50 * validatePipe call, which may be in a SurfaceData subclass, so
51 * its awkward to always ensure that the correct pipe is used.
52 * The easiest thing, rather than reproducing much of that logic
53 * is to call validatePipe() which works but is expensive, although
54 * probably not compared to the cost of filling the path.
55 * Note if AA hint is ON but text-AA hint is OFF this logic will
56 * produce AA text which perhaps isn't what the user expected.
57 * Note that the glyphvector obeys its FRC, not the G2D.
58 */
59
60 public class OutlineTextRenderer implements TextPipe {
61
62 // Text with a height greater than the threshhold will be
63 // drawn via this pipe.
64 public static final int THRESHHOLD = 100;
65
66 public void drawChars(SunGraphics2D g2d,
67 char[] data, int offset, int length,
68 int x, int y) {
69
70 String s = new String(data, offset, length);
71 drawString(g2d, s, x, y);
72 }
73
74 public void drawString(SunGraphics2D g2d, String str, double x, double y) {
75
76 if ("".equals(str)) {
77 return; // TextLayout constructor throws IAE on "".
78 }
79 TextLayout tl = new TextLayout(str, g2d.getFont(),
80 g2d.getFontRenderContext());
81 Shape s = tl.getOutline(AffineTransform.getTranslateInstance(x, y));
82
83 int textAAHint = g2d.getFontInfo().aaHint;
84
85 int prevaaHint = - 1;
86 if (textAAHint != SunHints.INTVAL_TEXT_ANTIALIAS_OFF &&
87 g2d.antialiasHint != SunHints.INTVAL_ANTIALIAS_ON) {
88 prevaaHint = g2d.antialiasHint;
89 g2d.antialiasHint = SunHints.INTVAL_ANTIALIAS_ON;
90 g2d.validatePipe();
91 } else if (textAAHint == SunHints.INTVAL_TEXT_ANTIALIAS_OFF
92 && g2d.antialiasHint != SunHints.INTVAL_ANTIALIAS_OFF) {
93 prevaaHint = g2d.antialiasHint;
94 g2d.antialiasHint = SunHints.INTVAL_ANTIALIAS_OFF;
95 g2d.validatePipe();
96 }
97
98 g2d.fill(s);
99
100 if (prevaaHint != -1) {
101 g2d.antialiasHint = prevaaHint;
102 g2d.validatePipe();
103 }
104 }
105
106 public void drawGlyphVector(SunGraphics2D g2d, GlyphVector gv,
107 float x, float y) {
108
109
110 Shape s = gv.getOutline(x, y);
111 int prevaaHint = - 1;
112 FontRenderContext frc = gv.getFontRenderContext();
113 boolean aa = frc.isAntiAliased();
114
115 /* aa will be true if any AA mode has been specified.
116 * ie for LCD and 'gasp' modes too.
117 * We will check if 'gasp' has resolved AA to be "OFF", and
118 * in all other cases (ie AA ON and all LCD modes) use AA outlines.
119 */
120 if (aa) {
121 if (g2d.getGVFontInfo(gv.getFont(), frc).aaHint ==
122 SunHints.INTVAL_TEXT_ANTIALIAS_OFF) {
123 aa = false;
124 }
125 }
126
127 if (aa && g2d.antialiasHint != SunHints.INTVAL_ANTIALIAS_ON) {
128 prevaaHint = g2d.antialiasHint;
129 g2d.antialiasHint = SunHints.INTVAL_ANTIALIAS_ON;
130 g2d.validatePipe();
131 } else if (!aa && g2d.antialiasHint != SunHints.INTVAL_ANTIALIAS_OFF) {
132 prevaaHint = g2d.antialiasHint;
133 g2d.antialiasHint = SunHints.INTVAL_ANTIALIAS_OFF;
134 g2d.validatePipe();
135 }
136
137 g2d.fill(s);
138
139 if (prevaaHint != -1) {
140 g2d.antialiasHint = prevaaHint;
141 g2d.validatePipe();
142 }
143 }
144 }