1 /*
2 * Copyright (c) 1998, 2016, 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 sun.java2d.SunGraphics2D;
31
32 /**
33 * This class uses a Region iterator to modify the extents of alpha
34 * tiles created during Shape rendering based upon a non-rectangular
35 * clipping path.
36 */
37 public class SpanClipRenderer implements CompositePipe
38 {
39 CompositePipe outpipe;
40
41 static Class<?> RegionClass = Region.class;
42 static Class<?> RegionIteratorClass = RegionIterator.class;
43
44 static {
45 initIDs(RegionClass, RegionIteratorClass);
46 }
47
48 static native void initIDs(Class<?> rc, Class<?> ric);
49
50 public SpanClipRenderer(CompositePipe pipe) {
51 outpipe = pipe;
52 }
53
54 class SCRcontext {
55 RegionIterator iterator;
56 Object outcontext;
57 int band[];
58 byte tile[];
59
60 public SCRcontext(RegionIterator ri, Object outctx) {
61 iterator = ri;
62 outcontext = outctx;
63 band = new int[4];
64 }
65 }
66
67 public Object startSequence(SunGraphics2D sg, Shape s, Rectangle devR,
68 int[] abox) {
69 RegionIterator ri = sg.clipRegion.getIterator();
70
71 return new SCRcontext(ri, outpipe.startSequence(sg, s, devR, abox));
72 }
73
74 public boolean needTile(Object ctx, int x, int y, int w, int h) {
75 SCRcontext context = (SCRcontext) ctx;
76 return (outpipe.needTile(context.outcontext, x, y, w, h));
77 }
78
79 public void renderPathTile(Object ctx,
80 byte[] atile, int offset, int tsize,
81 int x, int y, int w, int h,
82 ShapeSpanIterator sr) {
83 renderPathTile(ctx, atile, offset, tsize, x, y, w, h);
84 }
85
86 public void renderPathTile(Object ctx,
87 byte[] atile, int offset, int tsize,
88 int x, int y, int w, int h) {
89 SCRcontext context = (SCRcontext) ctx;
90 RegionIterator ri = context.iterator.createCopy();
91 int[] band = context.band;
92 band[0] = x;
93 band[1] = y;
94 band[2] = x + w;
95 band[3] = y + h;
96 if (atile == null) {
97 int size = w * h;
98 atile = context.tile;
99 if (atile != null && atile.length < size) {
100 atile = null;
101 }
102 if (atile == null) {
103 atile = new byte[size];
104 context.tile = atile;
105 }
106 offset = 0;
107 tsize = w;
108 fillTile(ri, atile, offset, tsize, band);
109 } else {
110 eraseTile(ri, atile, offset, tsize, band);
111 }
112
113 if (band[2] > band[0] && band[3] > band[1]) {
114 offset += (band[1] - y) * tsize + (band[0] - x);
115 outpipe.renderPathTile(context.outcontext,
116 atile, offset, tsize,
117 band[0], band[1],
118 band[2] - band[0],
119 band[3] - band[1]);
120 }
121 }
122
123 public native void fillTile(RegionIterator ri,
124 byte[] alpha, int offset, int tsize,
125 int[] band);
126
127 public native void eraseTile(RegionIterator ri,
128 byte[] alpha, int offset, int tsize,
129 int[] band);
130
131 public void skipTile(Object ctx, int x, int y) {
132 SCRcontext context = (SCRcontext) ctx;
133 outpipe.skipTile(context.outcontext, x, y);
134 }
135
136 public void endSequence(Object ctx) {
137 SCRcontext context = (SCRcontext) ctx;
138 outpipe.endSequence(context.outcontext);
139 }
140 }