1 /*
2 * Copyright (c) 1998, 1999, 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.Rectangle;
29 import java.awt.Shape;
30 import java.awt.geom.PathIterator;
31 import sun.java2d.SunGraphics2D;
32
33 /**
34 * This class uses a Region iterator to modify the extents of alpha
35 * tiles created during Shape rendering based upon a non-rectangular
36 * clipping path.
37 */
38 public class SpanClipRenderer implements CompositePipe
39 {
40 CompositePipe outpipe;
41
42 static Class<?> RegionClass = Region.class;
43 static Class<?> RegionIteratorClass = RegionIterator.class;
44
45 static {
46 initIDs(RegionClass, RegionIteratorClass);
47 }
48
49 static native void initIDs(Class<?> rc, Class<?> ric);
50
51 public SpanClipRenderer(CompositePipe pipe) {
52 outpipe = pipe;
53 }
54
55 class SCRcontext {
56 RegionIterator iterator;
57 Object outcontext;
58 int band[];
59 byte tile[];
60
61 public SCRcontext(RegionIterator ri, Object outctx) {
62 iterator = ri;
63 outcontext = outctx;
64 band = new int[4];
65 }
66 }
67
68 public Object startSequence(SunGraphics2D sg, Shape s, Rectangle devR,
69 int[] abox) {
70 RegionIterator ri = sg.clipRegion.getIterator();
71
72 return new SCRcontext(ri, outpipe.startSequence(sg, s, devR, abox));
73 }
74
75 public boolean needTile(Object ctx, int x, int y, int w, int h) {
76 SCRcontext context = (SCRcontext) ctx;
77 return (outpipe.needTile(context.outcontext, x, y, w, h));
78 }
79
80 public void renderPathTile(Object ctx,
81 byte[] atile, int offset, int tsize,
82 int x, int y, int w, int h,
83 ShapeSpanIterator sr) {
84 renderPathTile(ctx, atile, offset, tsize, x, y, w, h);
85 }
86
87 public void renderPathTile(Object ctx,
88 byte[] atile, int offset, int tsize,
89 int x, int y, int w, int h) {
90 SCRcontext context = (SCRcontext) ctx;
91 RegionIterator ri = context.iterator.createCopy();
92 int[] band = context.band;
93 band[0] = x;
94 band[1] = y;
95 band[2] = x + w;
96 band[3] = y + h;
97 if (atile == null) {
98 int size = w * h;
99 atile = context.tile;
100 if (atile != null && atile.length < size) {
101 atile = null;
102 }
103 if (atile == null) {
104 atile = new byte[size];
105 context.tile = atile;
106 }
107 offset = 0;
108 tsize = w;
109 fillTile(ri, atile, offset, tsize, band);
110 } else {
111 eraseTile(ri, atile, offset, tsize, band);
112 }
113
114 if (band[2] > band[0] && band[3] > band[1]) {
115 offset += (band[1] - y) * tsize + (band[0] - x);
116 outpipe.renderPathTile(context.outcontext,
117 atile, offset, tsize,
118 band[0], band[1],
119 band[2] - band[0],
120 band[3] - band[1]);
121 }
122 }
123
124 public native void fillTile(RegionIterator ri,
125 byte[] alpha, int offset, int tsize,
126 int[] band);
127
128 public native void eraseTile(RegionIterator ri,
129 byte[] alpha, int offset, int tsize,
130 int[] band);
131
132 public void skipTile(Object ctx, int x, int y) {
133 SCRcontext context = (SCRcontext) ctx;
134 outpipe.skipTile(context.outcontext, x, y);
135 }
136
137 public void endSequence(Object ctx) {
138 SCRcontext context = (SCRcontext) ctx;
139 outpipe.endSequence(context.outcontext);
140 }
141 }