1 /*
2 * Copyright (c) 2007, 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.marlin;
27
28 import jdk.internal.misc.Unsafe;
29
30 /**
31 * An object used to cache pre-rendered complex paths.
32 *
33 * @see Renderer
34 */
35 public final class MarlinCache implements MarlinConst {
36
37 static final boolean FORCE_RLE = MarlinProperties.isForceRLE();
38 static final boolean FORCE_NO_RLE = MarlinProperties.isForceNoRLE();
39 // minimum width to try using RLE encoding:
40 static final int RLE_MIN_WIDTH
41 = Math.max(BLOCK_SIZE, MarlinProperties.getRLEMinWidth());
42 // maximum width for RLE encoding:
43 // values are stored as int [x|alpha] where alpha is 8 bits
44 static final int RLE_MAX_WIDTH = 1 << (24 - 1);
45
46 // 2048 (pixelSize) alpha values (width) x 32 rows (tile) = 64K bytes
47 // x1 instead of 4 bytes (RLE) ie 1/4 capacity or average good RLE compression
48 static final long INITIAL_CHUNK_ARRAY = TILE_H * INITIAL_PIXEL_DIM; // 64K
49
50 // The alpha map used by this object (taken out of our map cache) to convert
51 // pixel coverage counts gotten from MarlinCache (which are in the range
52 // [0, maxalpha]) into alpha values, which are in [0,256).
53 static final byte[] ALPHA_MAP;
54
55 static final OffHeapArray ALPHA_MAP_UNSAFE;
56
57 static {
58 final byte[] _ALPHA_MAP = buildAlphaMap(MAX_AA_ALPHA);
59
60 ALPHA_MAP_UNSAFE = new OffHeapArray(_ALPHA_MAP, _ALPHA_MAP.length); // 1K
61 ALPHA_MAP =_ALPHA_MAP;
62
63 final Unsafe _unsafe = OffHeapArray.UNSAFE;
64 final long addr = ALPHA_MAP_UNSAFE.address;
65
66 for (int i = 0; i < _ALPHA_MAP.length; i++) {
67 _unsafe.putByte(addr + i, _ALPHA_MAP[i]);
68 }
69 }
70
71 int bboxX0, bboxY0, bboxX1, bboxY1;
72
73 // 1D dirty arrays
74 // row index in rowAAChunk[]
75 final long[] rowAAChunkIndex = new long[TILE_H];
76 // first pixel (inclusive) for each row
77 final int[] rowAAx0 = new int[TILE_H];
78 // last pixel (exclusive) for each row
79 final int[] rowAAx1 = new int[TILE_H];
80 // encoding mode (0=raw, 1=RLE encoding) for each row
81 final int[] rowAAEnc = new int[TILE_H];
82 // coded length (RLE encoding) for each row
83 final long[] rowAALen = new long[TILE_H];
84 // last position in RLE decoding for each row (getAlpha):
85 final long[] rowAAPos = new long[TILE_H];
86
87 // dirty off-heap array containing pixel coverages for (32) rows (packed)
88 // if encoding=raw, it contains alpha coverage values (val) as integer
89 // if encoding=RLE, it contains tuples (val, last x-coordinate exclusive)
90 // use rowAAx0/rowAAx1 to get row indices within this chunk
91 final OffHeapArray rowAAChunk;
92
93 // current position in rowAAChunk array
94 long rowAAChunkPos;
95
96 // touchedTile[i] is the sum of all the alphas in the tile with
97 // x=j*TILE_SIZE+bboxX0.
98 int[] touchedTile;
99
100 // per-thread renderer stats
101 final RendererStats rdrStats;
102
103 // touchedTile ref (clean)
104 private final IntArrayCache.Reference touchedTile_ref;
105
106 int tileMin, tileMax;
107
108 boolean useRLE = false;
109
110 MarlinCache(final IRendererContext rdrCtx) {
111 this.rdrStats = rdrCtx.stats();
112
113 rowAAChunk = rdrCtx.newOffHeapArray(INITIAL_CHUNK_ARRAY); // 64K
114
115 touchedTile_ref = rdrCtx.newCleanIntArrayRef(INITIAL_ARRAY); // 1K = 1 tile line
116 touchedTile = touchedTile_ref.initial;
117
118 // tile used marks:
119 tileMin = Integer.MAX_VALUE;
120 tileMax = Integer.MIN_VALUE;
121 }
122
123 void init(int minx, int miny, int maxx, int maxy)
124 {
125 // assert maxy >= miny && maxx >= minx;
126 bboxX0 = minx;
127 bboxY0 = miny;
128 bboxX1 = maxx;
129 bboxY1 = maxy;
130
131 final int width = (maxx - minx);
132
133 if (FORCE_NO_RLE) {
134 useRLE = false;
135 } else if (FORCE_RLE) {
136 useRLE = true;
137 } else {
138 // heuristics: use both bbox area and complexity
139 // ie number of primitives:
140
141 // fast check min and max width (maxx < 23bits):
142 if (width <= RLE_MIN_WIDTH || width >= RLE_MAX_WIDTH) {
143 useRLE = false;
144 } else {
145 useRLE = true;
146 }
147 }
148
149 // the ceiling of (maxy - miny + 1) / TILE_SIZE;
150 final int nxTiles = (width + TILE_W) >> TILE_W_LG;
151
152 if (nxTiles > INITIAL_ARRAY) {
153 if (DO_STATS) {
154 rdrStats.stat_array_marlincache_touchedTile.add(nxTiles);
155 }
156 touchedTile = touchedTile_ref.getArray(nxTiles);
157 }
158 }
159
160 /**
161 * Disposes this cache:
162 * clean up before reusing this instance
163 */
164 void dispose() {
165 // Reset touchedTile if needed:
166 resetTileLine(0);
167
168 if (DO_STATS) {
169 rdrStats.totalOffHeap += rowAAChunk.length;
170 }
171
172 // Return arrays:
173 touchedTile = touchedTile_ref.putArray(touchedTile, 0, 0); // already zero filled
174
175 // At last: resize back off-heap rowAA to initial size
176 if (rowAAChunk.length != INITIAL_CHUNK_ARRAY) {
177 // note: may throw OOME:
178 rowAAChunk.resize(INITIAL_CHUNK_ARRAY);
179 }
180 if (DO_CLEAN_DIRTY) {
181 // Force zero-fill dirty arrays:
182 rowAAChunk.fill(BYTE_0);
183 }
184 }
185
186 void resetTileLine(final int pminY) {
187 // update bboxY0 to process a complete tile line [0 - 32]
188 bboxY0 = pminY;
189
190 // reset current pos
191 if (DO_STATS) {
192 rdrStats.stat_cache_rowAAChunk.add(rowAAChunkPos);
193 }
194 rowAAChunkPos = 0L;
195
196 // Reset touchedTile:
197 if (tileMin != Integer.MAX_VALUE) {
198 if (DO_STATS) {
199 rdrStats.stat_cache_tiles.add(tileMax - tileMin);
200 }
201 // clean only dirty touchedTile:
202 if (tileMax == 1) {
203 touchedTile[0] = 0;
204 } else {
205 IntArrayCache.fill(touchedTile, tileMin, tileMax, 0);
206 }
207 // reset tile used marks:
208 tileMin = Integer.MAX_VALUE;
209 tileMax = Integer.MIN_VALUE;
210 }
211
212 if (DO_CLEAN_DIRTY) {
213 // Force zero-fill dirty arrays:
214 rowAAChunk.fill(BYTE_0);
215 }
216 }
217
218 void clearAARow(final int y) {
219 // process tile line [0 - 32]
220 final int row = y - bboxY0;
221
222 // update pixel range:
223 rowAAx0[row] = 0; // first pixel inclusive
224 rowAAx1[row] = 0; // last pixel exclusive
225 rowAAEnc[row] = 0; // raw encoding
226
227 // note: leave rowAAChunkIndex[row] undefined
228 // and rowAALen[row] & rowAAPos[row] (RLE)
229 }
230
231 /**
232 * Copy the given alpha data into the rowAA cache
233 * @param alphaRow alpha data to copy from
234 * @param y y pixel coordinate
235 * @param px0 first pixel inclusive x0
236 * @param px1 last pixel exclusive x1
237 */
238 void copyAARowNoRLE(final int[] alphaRow, final int y,
239 final int px0, final int px1)
240 {
241 // skip useless pixels above boundary
242 final int px_bbox1 = FloatMath.min(px1, bboxX1);
243
244 if (DO_LOG_BOUNDS) {
245 MarlinUtils.logInfo("row = [" + px0 + " ... " + px_bbox1
246 + " (" + px1 + ") [ for y=" + y);
247 }
248
249 final int row = y - bboxY0;
250
251 // update pixel range:
252 rowAAx0[row] = px0; // first pixel inclusive
253 rowAAx1[row] = px_bbox1; // last pixel exclusive
254 rowAAEnc[row] = 0; // raw encoding
255
256 // get current position (bytes):
257 final long pos = rowAAChunkPos;
258 // update row index to current position:
259 rowAAChunkIndex[row] = pos;
260
261 // determine need array size:
262 // for RLE encoding, position must be aligned to 4 bytes (int):
263 // align - 1 = 3 so add +3 and round-off by mask ~3 = -4
264 final long needSize = pos + ((px_bbox1 - px0 + 3) & -4);
265
266 // update next position (bytes):
267 rowAAChunkPos = needSize;
268
269 // update row data:
270 final OffHeapArray _rowAAChunk = rowAAChunk;
271 // ensure rowAAChunk capacity:
272 if (_rowAAChunk.length < needSize) {
273 expandRowAAChunk(needSize);
274 }
275 if (DO_STATS) {
276 rdrStats.stat_cache_rowAA.add(px_bbox1 - px0);
277 }
278
279 // rowAA contains only alpha values for range[x0; x1[
280 final int[] _touchedTile = touchedTile;
281 final int _TILE_SIZE_LG = TILE_W_LG;
282
283 final int from = px0 - bboxX0; // first pixel inclusive
284 final int to = px_bbox1 - bboxX0; // last pixel exclusive
285
286 final Unsafe _unsafe = OffHeapArray.UNSAFE;
287 final long SIZE_BYTE = 1L;
288 final long addr_alpha = ALPHA_MAP_UNSAFE.address;
289 long addr_off = _rowAAChunk.address + pos;
290
291 // compute alpha sum into rowAA:
292 for (int x = from, val = 0; x < to; x++) {
293 // alphaRow is in [0; MAX_COVERAGE]
294 val += alphaRow[x]; // [from; to[
295
296 // ensure values are in [0; MAX_AA_ALPHA] range
297 if (DO_AA_RANGE_CHECK) {
298 if (val < 0) {
299 System.out.println("Invalid coverage = " + val);
300 val = 0;
301 }
302 if (val > MAX_AA_ALPHA) {
303 System.out.println("Invalid coverage = " + val);
304 val = MAX_AA_ALPHA;
305 }
306 }
307
308 // store alpha sum (as byte):
309 if (val == 0) {
310 _unsafe.putByte(addr_off, (byte)0); // [0..255]
311 } else {
312 _unsafe.putByte(addr_off, _unsafe.getByte(addr_alpha + val)); // [0..255]
313
314 // update touchedTile
315 _touchedTile[x >> _TILE_SIZE_LG] += val;
316 }
317 addr_off += SIZE_BYTE;
318 }
319
320 // update tile used marks:
321 int tx = from >> _TILE_SIZE_LG; // inclusive
322 if (tx < tileMin) {
323 tileMin = tx;
324 }
325
326 tx = ((to - 1) >> _TILE_SIZE_LG) + 1; // exclusive (+1 to be sure)
327 if (tx > tileMax) {
328 tileMax = tx;
329 }
330
331 if (DO_LOG_BOUNDS) {
332 MarlinUtils.logInfo("clear = [" + from + " ... " + to + "[");
333 }
334
335 // Clear alpha row for reuse:
336 IntArrayCache.fill(alphaRow, from, px1 + 1 - bboxX0, 0);
337 }
338
339 void copyAARowRLE_WithBlockFlags(final int[] blkFlags, final int[] alphaRow,
340 final int y, final int px0, final int px1)
341 {
342 // Copy rowAA data into the piscesCache if one is present
343 final int _bboxX0 = bboxX0;
344
345 // process tile line [0 - 32]
346 final int row = y - bboxY0;
347 final int from = px0 - _bboxX0; // first pixel inclusive
348
349 // skip useless pixels above boundary
350 final int px_bbox1 = FloatMath.min(px1, bboxX1);
351 final int to = px_bbox1 - _bboxX0; // last pixel exclusive
352
353 if (DO_LOG_BOUNDS) {
354 MarlinUtils.logInfo("row = [" + px0 + " ... " + px_bbox1
355 + " (" + px1 + ") [ for y=" + y);
356 }
357
358 // get current position:
359 final long initialPos = startRLERow(row, px0, px_bbox1);
360
361 // determine need array size:
362 // pessimistic: max needed size = deltaX x 4 (1 int)
363 final long needSize = initialPos + ((to - from) << 2);
364
365 // update row data:
366 OffHeapArray _rowAAChunk = rowAAChunk;
367 // ensure rowAAChunk capacity:
368 if (_rowAAChunk.length < needSize) {
369 expandRowAAChunk(needSize);
370 }
371
372 final Unsafe _unsafe = OffHeapArray.UNSAFE;
373 final long SIZE_INT = 4L;
374 final long addr_alpha = ALPHA_MAP_UNSAFE.address;
375 long addr_off = _rowAAChunk.address + initialPos;
376
377 final int[] _touchedTile = touchedTile;
378 final int _TILE_SIZE_LG = TILE_W_LG;
379 final int _BLK_SIZE_LG = BLOCK_SIZE_LG;
380
381 // traverse flagged blocks:
382 final int blkW = (from >> _BLK_SIZE_LG);
383 final int blkE = (to >> _BLK_SIZE_LG) + 1;
384 // ensure last block flag = 0 to process final block:
385 blkFlags[blkE] = 0;
386
387 // Perform run-length encoding and store results in the piscesCache
388 int val = 0;
389 int cx0 = from;
390 int runLen;
391
392 final int _MAX_VALUE = Integer.MAX_VALUE;
393 int last_t0 = _MAX_VALUE;
394
395 int skip = 0;
396
397 for (int t = blkW, blk_x0, blk_x1, cx, delta; t <= blkE; t++) {
398 if (blkFlags[t] != 0) {
399 blkFlags[t] = 0;
400
401 if (last_t0 == _MAX_VALUE) {
402 last_t0 = t;
403 }
404 continue;
405 }
406 if (last_t0 != _MAX_VALUE) {
407 // emit blocks:
408 blk_x0 = FloatMath.max(last_t0 << _BLK_SIZE_LG, from);
409 last_t0 = _MAX_VALUE;
410
411 // (last block pixel+1) inclusive => +1
412 blk_x1 = FloatMath.min((t << _BLK_SIZE_LG) + 1, to);
413
414 for (cx = blk_x0; cx < blk_x1; cx++) {
415 if ((delta = alphaRow[cx]) != 0) {
416 alphaRow[cx] = 0;
417
418 // not first rle entry:
419 if (cx != cx0) {
420 runLen = cx - cx0;
421
422 // store alpha coverage (ensure within bounds):
423 // as [absX|val] where:
424 // absX is the absolute x-coordinate:
425 // note: last pixel exclusive (>= 0)
426 // note: it should check X is smaller than 23bits (overflow)!
427
428 // check address alignment to 4 bytes:
429 if (DO_CHECK_UNSAFE) {
430 if ((addr_off & 3) != 0) {
431 MarlinUtils.logInfo("Misaligned Unsafe address: " + addr_off);
432 }
433 }
434
435 // special case to encode entries into a single int:
436 if (val == 0) {
437 _unsafe.putInt(addr_off,
438 ((_bboxX0 + cx) << 8)
439 );
440 } else {
441 _unsafe.putInt(addr_off,
442 ((_bboxX0 + cx) << 8)
443 | (((int) _unsafe.getByte(addr_alpha + val)) & 0xFF) // [0..255]
444 );
445
446 if (runLen == 1) {
447 _touchedTile[cx0 >> _TILE_SIZE_LG] += val;
448 } else {
449 touchTile(cx0, val, cx, runLen, _touchedTile);
450 }
451 }
452 addr_off += SIZE_INT;
453
454 if (DO_STATS) {
455 rdrStats.hist_tile_generator_encoding_runLen
456 .add(runLen);
457 }
458 cx0 = cx;
459 }
460
461 // alpha value = running sum of coverage delta:
462 val += delta;
463
464 // ensure values are in [0; MAX_AA_ALPHA] range
465 if (DO_AA_RANGE_CHECK) {
466 if (val < 0) {
467 System.out.println("Invalid coverage = " + val);
468 val = 0;
469 }
470 if (val > MAX_AA_ALPHA) {
471 System.out.println("Invalid coverage = " + val);
472 val = MAX_AA_ALPHA;
473 }
474 }
475 }
476 }
477 } else if (DO_STATS) {
478 skip++;
479 }
480 }
481
482 // Process remaining RLE run:
483 runLen = to - cx0;
484
485 // store alpha coverage (ensure within bounds):
486 // as (int)[absX|val] where:
487 // absX is the absolute x-coordinate in bits 31 to 8 and val in bits 0..7
488 // note: last pixel exclusive (>= 0)
489 // note: it should check X is smaller than 23bits (overflow)!
490
491 // check address alignment to 4 bytes:
492 if (DO_CHECK_UNSAFE) {
493 if ((addr_off & 3) != 0) {
494 MarlinUtils.logInfo("Misaligned Unsafe address: " + addr_off);
495 }
496 }
497
498 // special case to encode entries into a single int:
499 if (val == 0) {
500 _unsafe.putInt(addr_off,
501 ((_bboxX0 + to) << 8)
502 );
503 } else {
504 _unsafe.putInt(addr_off,
505 ((_bboxX0 + to) << 8)
506 | (((int) _unsafe.getByte(addr_alpha + val)) & 0xFF) // [0..255]
507 );
508
509 if (runLen == 1) {
510 _touchedTile[cx0 >> _TILE_SIZE_LG] += val;
511 } else {
512 touchTile(cx0, val, to, runLen, _touchedTile);
513 }
514 }
515 addr_off += SIZE_INT;
516
517 if (DO_STATS) {
518 rdrStats.hist_tile_generator_encoding_runLen.add(runLen);
519 }
520
521 long len = (addr_off - _rowAAChunk.address);
522
523 // update coded length as bytes:
524 rowAALen[row] = (len - initialPos);
525
526 // update current position:
527 rowAAChunkPos = len;
528
529 if (DO_STATS) {
530 rdrStats.stat_cache_rowAA.add(rowAALen[row]);
531 rdrStats.hist_tile_generator_encoding_ratio.add(
532 (100 * skip) / (blkE - blkW)
533 );
534 }
535
536 // update tile used marks:
537 int tx = from >> _TILE_SIZE_LG; // inclusive
538 if (tx < tileMin) {
539 tileMin = tx;
540 }
541
542 tx = ((to - 1) >> _TILE_SIZE_LG) + 1; // exclusive (+1 to be sure)
543 if (tx > tileMax) {
544 tileMax = tx;
545 }
546
547 // Clear alpha row for reuse:
548 alphaRow[to] = 0;
549 if (DO_CHECKS) {
550 IntArrayCache.check(blkFlags, blkW, blkE, 0);
551 IntArrayCache.check(alphaRow, from, px1 + 1 - bboxX0, 0);
552 }
553 }
554
555 long startRLERow(final int row, final int x0, final int x1) {
556 // rows are supposed to be added by increasing y.
557 rowAAx0[row] = x0; // first pixel inclusive
558 rowAAx1[row] = x1; // last pixel exclusive
559 rowAAEnc[row] = 1; // RLE encoding
560 rowAAPos[row] = 0L; // position = 0
561
562 // update row index to current position:
563 return (rowAAChunkIndex[row] = rowAAChunkPos);
564 }
565
566 private void expandRowAAChunk(final long needSize) {
567 if (DO_STATS) {
568 rdrStats.stat_array_marlincache_rowAAChunk.add(needSize);
569 }
570
571 // note: throw IOOB if neededSize > 2Gb:
572 final long newSize = ArrayCacheConst.getNewLargeSize(rowAAChunk.length,
573 needSize);
574
575 rowAAChunk.resize(newSize);
576 }
577
578 private void touchTile(final int x0, final int val, final int x1,
579 final int runLen,
580 final int[] _touchedTile)
581 {
582 // the x and y of the current row, minus bboxX0, bboxY0
583 // process tile line [0 - 32]
584 final int _TILE_SIZE_LG = TILE_W_LG;
585
586 // update touchedTile
587 int tx = (x0 >> _TILE_SIZE_LG);
588
589 // handle trivial case: same tile (x0, x0+runLen)
590 if (tx == (x1 >> _TILE_SIZE_LG)) {
591 // same tile:
592 _touchedTile[tx] += val * runLen;
593 return;
594 }
595
596 final int tx1 = (x1 - 1) >> _TILE_SIZE_LG;
597
598 if (tx <= tx1) {
599 final int nextTileXCoord = (tx + 1) << _TILE_SIZE_LG;
600 _touchedTile[tx++] += val * (nextTileXCoord - x0);
601 }
602 if (tx < tx1) {
603 // don't go all the way to tx1 - we need to handle the last
604 // tile as a special case (just like we did with the first
605 final int tileVal = (val << _TILE_SIZE_LG);
606 for (; tx < tx1; tx++) {
607 _touchedTile[tx] += tileVal;
608 }
609 }
610 // they will be equal unless x0 >> TILE_SIZE_LG == tx1
611 if (tx == tx1) {
612 final int txXCoord = tx << _TILE_SIZE_LG;
613 final int nextTileXCoord = (tx + 1) << _TILE_SIZE_LG;
614
615 final int lastXCoord = (nextTileXCoord <= x1) ? nextTileXCoord : x1;
616 _touchedTile[tx] += val * (lastXCoord - txXCoord);
617 }
618 }
619
620 int alphaSumInTile(final int x) {
621 return touchedTile[(x - bboxX0) >> TILE_W_LG];
622 }
623
624 @Override
625 public String toString() {
626 return "bbox = ["
627 + bboxX0 + ", " + bboxY0 + " => "
628 + bboxX1 + ", " + bboxY1 + "]\n";
629 }
630
631 private static byte[] buildAlphaMap(final int maxalpha) {
632 // double size !
633 final byte[] alMap = new byte[maxalpha << 1];
634 final int halfmaxalpha = maxalpha >> 2;
635 for (int i = 0; i <= maxalpha; i++) {
636 alMap[i] = (byte) ((i * 255 + halfmaxalpha) / maxalpha);
637 // System.out.println("alphaMap[" + i + "] = "
638 // + Byte.toUnsignedInt(alMap[i]));
639 }
640 return alMap;
641 }
642 }