1 /*
2 * Copyright (c) 1997, 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 package sun.java2d.pipe;
26
27 import java.awt.BasicStroke;
28 import java.awt.Rectangle;
29 import java.awt.Shape;
30 import java.awt.geom.Rectangle2D;
31 import java.util.concurrent.ConcurrentLinkedQueue;
32 import sun.awt.SunHints;
33 import sun.java2d.SunGraphics2D;
34
35 /**
36 * This class is used to convert raw geometry into 8-bit alpha tiles
37 * using an AATileGenerator for application by the next stage of
38 * the pipeline.
39 * This class sets up the Generator and computes the alpha tiles
40 * and then passes them on to a CompositePipe object for painting.
41 */
42 public final class AAShapePipe
43 implements ShapeDrawPipe, ParallelogramPipe
44 {
45 static final RenderingEngine renderengine = RenderingEngine.getInstance();
46
47 // Per-thread TileState (~1K very small so do not use any Weak Reference)
48 private static final ReentrantThreadLocal<TileState> tileStateThreadLocal =
49 new ReentrantThreadLocal<TileState>() {
50 @Override
51 protected TileState initialValue() {
52 return new TileState();
53 }
54 };
55
56 final CompositePipe outpipe;
57
58 public AAShapePipe(CompositePipe pipe) {
59 outpipe = pipe;
60 }
61
62 @Override
63 public void draw(SunGraphics2D sg, Shape s) {
64 final BasicStroke bs;
65
66 if (sg.stroke instanceof BasicStroke) {
67 bs = (BasicStroke) sg.stroke;
68 } else {
69 s = sg.stroke.createStrokedShape(s);
70 bs = null;
71 }
72
73 renderPath(sg, s, bs);
74 }
75
76 @Override
77 public void fill(SunGraphics2D sg, Shape s) {
78 renderPath(sg, s, null);
79 }
80
81 @Override
82 public void fillParallelogram(SunGraphics2D sg,
83 double ux1, double uy1,
84 double ux2, double uy2,
85 double x, double y,
86 double dx1, double dy1,
87 double dx2, double dy2)
88 {
89 final TileState ts = tileStateThreadLocal.get();
90 try {
91 final int[] abox = ts.abox;
92
93 final AATileGenerator aatg =
94 renderengine.getAATileGenerator(x, y, dx1, dy1, dx2, dy2, 0, 0,
95 sg.getCompClip(), abox);
96 if (aatg != null) {
97 renderTiles(sg, ts.computeBBox(ux1, uy1, ux2, uy2),
98 aatg, abox, ts);
99 }
100 } finally {
101 tileStateThreadLocal.restore(ts);
102 }
103 }
104
105 @Override
106 public void drawParallelogram(SunGraphics2D sg,
107 double ux1, double uy1,
108 double ux2, double uy2,
109 double x, double y,
110 double dx1, double dy1,
111 double dx2, double dy2,
112 double lw1, double lw2)
113 {
114 final TileState ts = tileStateThreadLocal.get();
115 try {
116 final int[] abox = ts.abox;
117
118 final AATileGenerator aatg =
119 renderengine.getAATileGenerator(x, y, dx1, dy1, dx2, dy2, lw1,
120 lw2, sg.getCompClip(), abox);
121 if (aatg != null) {
122 // Note that bbox is of the original shape, not the wide path.
123 // This is appropriate for handing to Paint methods...
124 renderTiles(sg, ts.computeBBox(ux1, uy1, ux2, uy2),
125 aatg, abox, ts);
126 }
127 } finally {
128 tileStateThreadLocal.restore(ts);
129 }
130 }
131
132 public void renderPath(SunGraphics2D sg, Shape s, BasicStroke bs) {
133 final boolean adjust = (bs != null &&
134 sg.strokeHint != SunHints.INTVAL_STROKE_PURE);
135 final boolean thin = (sg.strokeState <= SunGraphics2D.STROKE_THINDASHED);
136
137 final TileState ts = tileStateThreadLocal.get();
138 try {
139 final int[] abox = ts.abox;
140
141 final AATileGenerator aatg =
142 renderengine.getAATileGenerator(s, sg.transform, sg.getCompClip(),
143 bs, thin, adjust, abox);
144 if (aatg != null) {
145 renderTiles(sg, s, aatg, abox, ts);
146 }
147 } finally {
148 tileStateThreadLocal.restore(ts);
149 }
150 }
151
152 public void renderTiles(SunGraphics2D sg, Shape s,
153 final AATileGenerator aatg,
154 final int[] abox, final TileState ts)
155 {
156 Object context = null;
157 try {
158 // reentrance: outpipe may also use AAShapePipe:
159 context = outpipe.startSequence(sg, s,
160 ts.computeDevBox(abox),
161 abox);
162
163 // copy of int[] abox as local variables for performance:
164 final int x0 = abox[0];
165 final int y0 = abox[1];
166 final int x1 = abox[2];
167 final int y1 = abox[3];
168
169 final int tw = aatg.getTileWidth();
170 final int th = aatg.getTileHeight();
171
172 // get tile from thread local storage:
173 final byte[] alpha = ts.getAlphaTile(tw * th);
174 byte[] atile;
175
176 for (int y = y0; y < y1; y += th) {
177 final int h = Math.min(th, y1 - y);
178
179 for (int x = x0; x < x1; x += tw) {
180 final int w = Math.min(tw, x1 - x);
181
182 final int a = aatg.getTypicalAlpha();
183
184 if (a == 0x00 || !outpipe.needTile(context, x, y, w, h)) {
185 aatg.nextTile();
186 outpipe.skipTile(context, x, y);
187 continue;
188 }
189 if (a == 0xff) {
190 atile = null;
191 aatg.nextTile();
192 } else {
193 atile = alpha;
194 aatg.getAlpha(alpha, 0, tw);
195 }
196
197 outpipe.renderPathTile(context, atile, 0, tw, x, y, w, h);
198 }
199 }
200 } finally {
201 aatg.dispose();
202 if (context != null) {
203 outpipe.endSequence(context);
204 }
205 }
206 }
207
208 // Tile state used by AAShapePipe
209 static final class TileState extends ReentrantContext {
210 // cached tile (32 x 32 tile by default)
211 private byte[] theTile = new byte[32 * 32];
212 // dirty aabox array
213 final int[] abox = new int[4];
214 // dirty bbox rectangle
215 private final Rectangle dev = new Rectangle();
216 // dirty bbox rectangle2D.Double
217 private final Rectangle2D.Double bbox2D = new Rectangle2D.Double();
218
219 byte[] getAlphaTile(int len) {
220 byte[] t = theTile;
221 if (t.length < len) {
222 // create a larger tile and may free current theTile (too small)
223 theTile = t = new byte[len];
224 }
225 return t;
226 }
227
228 Rectangle computeDevBox(final int[] abox) {
229 final Rectangle box = this.dev;
230 box.x = abox[0];
231 box.y = abox[1];
232 box.width = abox[2] - abox[0];
233 box.height = abox[3] - abox[1];
234 return box;
235 }
236
237 Rectangle2D computeBBox(double ux1, double uy1,
238 double ux2, double uy2)
239 {
240 if ((ux2 -= ux1) < 0.0) {
241 ux1 += ux2;
242 ux2 = -ux2;
243 }
244 if ((uy2 -= uy1) < 0.0) {
245 uy1 += uy2;
246 uy2 = -uy2;
247 }
248 final Rectangle2D.Double box = this.bbox2D;
249 box.x = ux1;
250 box.y = uy1;
251 box.width = ux2;
252 box.height = uy2;
253 return box;
254 }
255 }
256
257 static class ReentrantThreadLocal<K extends ReentrantContext>
258 extends ThreadLocal<K>
259 {
260 final static int DEPTH_UNDEFINED = 0;
261 final static int DEPTH_TL = 1;
262 final static int DEPTH_CLQ = 2;
263
264 // ReentrantContext queue for child contexts
265 private final ConcurrentLinkedQueue<K> ctxQueue
266 = new ConcurrentLinkedQueue<K>();
267
268 /**
269 * Give a ReentrantContext instance from thread-local or CLQ storage
270 * @return ReentrantContext instance
271 */
272 @Override
273 public final K get() {
274 K ctx = super.get();
275 // Check reentrance:
276 if (ctx.depth == ReentrantThreadLocal.DEPTH_UNDEFINED) {
277 ctx.depth = ReentrantThreadLocal.DEPTH_TL;
278 } else {
279 // get or create another ReentrantContext from queue:
280 ctx = ctxQueue.poll();
281 if (ctx == null) {
282 // create a new ReentrantContext if none is available
283 ctx = initialValue();
284 ctx.depth = ReentrantThreadLocal.DEPTH_CLQ;
285 }
286 }
287 return ctx;
288 }
289
290 /**
291 * Restore the given ReentrantContext instance for reuse
292 * @param ctx ReentrantContext instance
293 */
294 public final void restore(final K ctx) {
295 if (ctx.depth == ReentrantThreadLocal.DEPTH_TL) {
296 ctx.depth = ReentrantThreadLocal.DEPTH_UNDEFINED;
297 } else {
298 ctxQueue.offer(ctx);
299 }
300 }
301 }
302
303 static class ReentrantContext {
304 int depth = ReentrantThreadLocal.DEPTH_UNDEFINED;
305 }
306 }