1 /*
2 * Copyright (c) 2007, 2017, 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 static java.lang.Math.PI;
29 import java.util.Arrays;
30 import sun.awt.geom.PathConsumer2D;
31 import static sun.java2d.marlin.MarlinConst.INITIAL_EDGES_COUNT;
32 import sun.java2d.marlin.stats.Histogram;
33 import sun.java2d.marlin.stats.StatLong;
34
35 final class Helpers implements MarlinConst {
36
37 private Helpers() {
38 throw new Error("This is a non instantiable class");
39 }
40
41 static boolean within(final float x, final float y, final float err) {
42 final float d = y - x;
43 return (d <= err && d >= -err);
44 }
45
46 static boolean within(final double x, final double y, final double err) {
47 final double d = y - x;
48 return (d <= err && d >= -err);
49 }
50
51 static int quadraticRoots(final float a, final float b,
52 final float c, float[] zeroes, final int off)
53 {
54 int ret = off;
55 float t;
56 if (a != 0.0f) {
57 final float dis = b*b - 4*a*c;
58 if (dis > 0.0f) {
59 final float sqrtDis = (float) Math.sqrt(dis);
60 // depending on the sign of b we use a slightly different
61 // algorithm than the traditional one to find one of the roots
62 // so we can avoid adding numbers of different signs (which
63 // might result in loss of precision).
64 if (b >= 0.0f) {
65 zeroes[ret++] = (2.0f * c) / (-b - sqrtDis);
66 zeroes[ret++] = (-b - sqrtDis) / (2.0f * a);
67 } else {
68 zeroes[ret++] = (-b + sqrtDis) / (2.0f * a);
69 zeroes[ret++] = (2.0f * c) / (-b + sqrtDis);
70 }
71 } else if (dis == 0.0f) {
72 t = (-b) / (2.0f * a);
73 zeroes[ret++] = t;
74 }
75 } else {
76 if (b != 0.0f) {
77 t = (-c) / b;
78 zeroes[ret++] = t;
79 }
80 }
81 return ret - off;
82 }
83
84 // find the roots of g(t) = d*t^3 + a*t^2 + b*t + c in [A,B)
85 static int cubicRootsInAB(float d, float a, float b, float c,
86 float[] pts, final int off,
87 final float A, final float B)
88 {
89 if (d == 0.0f) {
90 int num = quadraticRoots(a, b, c, pts, off);
91 return filterOutNotInAB(pts, off, num, A, B) - off;
92 }
93 // From Graphics Gems:
94 // http://tog.acm.org/resources/GraphicsGems/gems/Roots3And4.c
95 // (also from awt.geom.CubicCurve2D. But here we don't need as
96 // much accuracy and we don't want to create arrays so we use
97 // our own customized version).
98
99 // normal form: x^3 + ax^2 + bx + c = 0
100 a /= d;
101 b /= d;
102 c /= d;
103
104 // substitute x = y - A/3 to eliminate quadratic term:
105 // x^3 +Px + Q = 0
106 //
107 // Since we actually need P/3 and Q/2 for all of the
108 // calculations that follow, we will calculate
109 // p = P/3
110 // q = Q/2
111 // instead and use those values for simplicity of the code.
112 double sq_A = a * a;
113 double p = (1.0d/3.0d) * ((-1.0d/3.0d) * sq_A + b);
114 double q = (1.0d/2.0d) * ((2.0d/27.0d) * a * sq_A - (1.0d/3.0d) * a * b + c);
115
116 // use Cardano's formula
117
118 double cb_p = p * p * p;
119 double D = q * q + cb_p;
120
121 int num;
122 if (D < 0.0d) {
123 // see: http://en.wikipedia.org/wiki/Cubic_function#Trigonometric_.28and_hyperbolic.29_method
124 final double phi = (1.0d/3.0d) * Math.acos(-q / Math.sqrt(-cb_p));
125 final double t = 2.0d * Math.sqrt(-p);
126
127 pts[ off+0 ] = (float) ( t * Math.cos(phi));
128 pts[ off+1 ] = (float) (-t * Math.cos(phi + (PI / 3.0d)));
129 pts[ off+2 ] = (float) (-t * Math.cos(phi - (PI / 3.0d)));
130 num = 3;
131 } else {
132 final double sqrt_D = Math.sqrt(D);
133 final double u = Math.cbrt(sqrt_D - q);
134 final double v = - Math.cbrt(sqrt_D + q);
135
136 pts[ off ] = (float) (u + v);
137 num = 1;
138
139 if (within(D, 0.0d, 1e-8d)) {
140 pts[off+1] = -(pts[off] / 2.0f);
141 num = 2;
142 }
143 }
144
145 final float sub = (1.0f/3.0f) * a;
146
147 for (int i = 0; i < num; ++i) {
148 pts[ off+i ] -= sub;
149 }
150
151 return filterOutNotInAB(pts, off, num, A, B) - off;
152 }
153
154 static float evalCubic(final float a, final float b,
155 final float c, final float d,
156 final float t)
157 {
158 return t * (t * (t * a + b) + c) + d;
159 }
160
161 static float evalQuad(final float a, final float b,
162 final float c, final float t)
163 {
164 return t * (t * a + b) + c;
165 }
166
167 // returns the index 1 past the last valid element remaining after filtering
168 static int filterOutNotInAB(float[] nums, final int off, final int len,
169 final float a, final float b)
170 {
171 int ret = off;
172 for (int i = off, end = off + len; i < end; i++) {
173 if (nums[i] >= a && nums[i] < b) {
174 nums[ret++] = nums[i];
175 }
176 }
177 return ret;
178 }
179
180 static float linelen(float x1, float y1, float x2, float y2) {
181 final float dx = x2 - x1;
182 final float dy = y2 - y1;
183 return (float) Math.sqrt(dx*dx + dy*dy);
184 }
185
186 static void subdivide(float[] src, int srcoff, float[] left, int leftoff,
187 float[] right, int rightoff, int type)
188 {
189 switch(type) {
190 case 6:
191 Helpers.subdivideQuad(src, srcoff, left, leftoff, right, rightoff);
192 return;
193 case 8:
194 Helpers.subdivideCubic(src, srcoff, left, leftoff, right, rightoff);
195 return;
196 default:
197 throw new InternalError("Unsupported curve type");
198 }
199 }
200
201 static void isort(float[] a, int off, int len) {
202 for (int i = off + 1, end = off + len; i < end; i++) {
203 float ai = a[i];
204 int j = i - 1;
205 for (; j >= off && a[j] > ai; j--) {
206 a[j+1] = a[j];
207 }
208 a[j+1] = ai;
209 }
210 }
211
212 // Most of these are copied from classes in java.awt.geom because we need
213 // both single and double precision variants of these functions, and Line2D,
214 // CubicCurve2D, QuadCurve2D don't provide them.
215 /**
216 * Subdivides the cubic curve specified by the coordinates
217 * stored in the <code>src</code> array at indices <code>srcoff</code>
218 * through (<code>srcoff</code> + 7) and stores the
219 * resulting two subdivided curves into the two result arrays at the
220 * corresponding indices.
221 * Either or both of the <code>left</code> and <code>right</code>
222 * arrays may be <code>null</code> or a reference to the same array
223 * as the <code>src</code> array.
224 * Note that the last point in the first subdivided curve is the
225 * same as the first point in the second subdivided curve. Thus,
226 * it is possible to pass the same array for <code>left</code>
227 * and <code>right</code> and to use offsets, such as <code>rightoff</code>
228 * equals (<code>leftoff</code> + 6), in order
229 * to avoid allocating extra storage for this common point.
230 * @param src the array holding the coordinates for the source curve
231 * @param srcoff the offset into the array of the beginning of the
232 * the 6 source coordinates
233 * @param left the array for storing the coordinates for the first
234 * half of the subdivided curve
235 * @param leftoff the offset into the array of the beginning of the
236 * the 6 left coordinates
237 * @param right the array for storing the coordinates for the second
238 * half of the subdivided curve
239 * @param rightoff the offset into the array of the beginning of the
240 * the 6 right coordinates
241 * @since 1.7
242 */
243 static void subdivideCubic(float[] src, int srcoff,
244 float[] left, int leftoff,
245 float[] right, int rightoff)
246 {
247 float x1 = src[srcoff + 0];
248 float y1 = src[srcoff + 1];
249 float ctrlx1 = src[srcoff + 2];
250 float ctrly1 = src[srcoff + 3];
251 float ctrlx2 = src[srcoff + 4];
252 float ctrly2 = src[srcoff + 5];
253 float x2 = src[srcoff + 6];
254 float y2 = src[srcoff + 7];
255 if (left != null) {
256 left[leftoff + 0] = x1;
257 left[leftoff + 1] = y1;
258 }
259 if (right != null) {
260 right[rightoff + 6] = x2;
261 right[rightoff + 7] = y2;
262 }
263 x1 = (x1 + ctrlx1) / 2.0f;
264 y1 = (y1 + ctrly1) / 2.0f;
265 x2 = (x2 + ctrlx2) / 2.0f;
266 y2 = (y2 + ctrly2) / 2.0f;
267 float centerx = (ctrlx1 + ctrlx2) / 2.0f;
268 float centery = (ctrly1 + ctrly2) / 2.0f;
269 ctrlx1 = (x1 + centerx) / 2.0f;
270 ctrly1 = (y1 + centery) / 2.0f;
271 ctrlx2 = (x2 + centerx) / 2.0f;
272 ctrly2 = (y2 + centery) / 2.0f;
273 centerx = (ctrlx1 + ctrlx2) / 2.0f;
274 centery = (ctrly1 + ctrly2) / 2.0f;
275 if (left != null) {
276 left[leftoff + 2] = x1;
277 left[leftoff + 3] = y1;
278 left[leftoff + 4] = ctrlx1;
279 left[leftoff + 5] = ctrly1;
280 left[leftoff + 6] = centerx;
281 left[leftoff + 7] = centery;
282 }
283 if (right != null) {
284 right[rightoff + 0] = centerx;
285 right[rightoff + 1] = centery;
286 right[rightoff + 2] = ctrlx2;
287 right[rightoff + 3] = ctrly2;
288 right[rightoff + 4] = x2;
289 right[rightoff + 5] = y2;
290 }
291 }
292
293
294 static void subdivideCubicAt(float t, float[] src, int srcoff,
295 float[] left, int leftoff,
296 float[] right, int rightoff)
297 {
298 float x1 = src[srcoff + 0];
299 float y1 = src[srcoff + 1];
300 float ctrlx1 = src[srcoff + 2];
301 float ctrly1 = src[srcoff + 3];
302 float ctrlx2 = src[srcoff + 4];
303 float ctrly2 = src[srcoff + 5];
304 float x2 = src[srcoff + 6];
305 float y2 = src[srcoff + 7];
306 if (left != null) {
307 left[leftoff + 0] = x1;
308 left[leftoff + 1] = y1;
309 }
310 if (right != null) {
311 right[rightoff + 6] = x2;
312 right[rightoff + 7] = y2;
313 }
314 x1 = x1 + t * (ctrlx1 - x1);
315 y1 = y1 + t * (ctrly1 - y1);
316 x2 = ctrlx2 + t * (x2 - ctrlx2);
317 y2 = ctrly2 + t * (y2 - ctrly2);
318 float centerx = ctrlx1 + t * (ctrlx2 - ctrlx1);
319 float centery = ctrly1 + t * (ctrly2 - ctrly1);
320 ctrlx1 = x1 + t * (centerx - x1);
321 ctrly1 = y1 + t * (centery - y1);
322 ctrlx2 = centerx + t * (x2 - centerx);
323 ctrly2 = centery + t * (y2 - centery);
324 centerx = ctrlx1 + t * (ctrlx2 - ctrlx1);
325 centery = ctrly1 + t * (ctrly2 - ctrly1);
326 if (left != null) {
327 left[leftoff + 2] = x1;
328 left[leftoff + 3] = y1;
329 left[leftoff + 4] = ctrlx1;
330 left[leftoff + 5] = ctrly1;
331 left[leftoff + 6] = centerx;
332 left[leftoff + 7] = centery;
333 }
334 if (right != null) {
335 right[rightoff + 0] = centerx;
336 right[rightoff + 1] = centery;
337 right[rightoff + 2] = ctrlx2;
338 right[rightoff + 3] = ctrly2;
339 right[rightoff + 4] = x2;
340 right[rightoff + 5] = y2;
341 }
342 }
343
344 static void subdivideQuad(float[] src, int srcoff,
345 float[] left, int leftoff,
346 float[] right, int rightoff)
347 {
348 float x1 = src[srcoff + 0];
349 float y1 = src[srcoff + 1];
350 float ctrlx = src[srcoff + 2];
351 float ctrly = src[srcoff + 3];
352 float x2 = src[srcoff + 4];
353 float y2 = src[srcoff + 5];
354 if (left != null) {
355 left[leftoff + 0] = x1;
356 left[leftoff + 1] = y1;
357 }
358 if (right != null) {
359 right[rightoff + 4] = x2;
360 right[rightoff + 5] = y2;
361 }
362 x1 = (x1 + ctrlx) / 2.0f;
363 y1 = (y1 + ctrly) / 2.0f;
364 x2 = (x2 + ctrlx) / 2.0f;
365 y2 = (y2 + ctrly) / 2.0f;
366 ctrlx = (x1 + x2) / 2.0f;
367 ctrly = (y1 + y2) / 2.0f;
368 if (left != null) {
369 left[leftoff + 2] = x1;
370 left[leftoff + 3] = y1;
371 left[leftoff + 4] = ctrlx;
372 left[leftoff + 5] = ctrly;
373 }
374 if (right != null) {
375 right[rightoff + 0] = ctrlx;
376 right[rightoff + 1] = ctrly;
377 right[rightoff + 2] = x2;
378 right[rightoff + 3] = y2;
379 }
380 }
381
382 static void subdivideQuadAt(float t, float[] src, int srcoff,
383 float[] left, int leftoff,
384 float[] right, int rightoff)
385 {
386 float x1 = src[srcoff + 0];
387 float y1 = src[srcoff + 1];
388 float ctrlx = src[srcoff + 2];
389 float ctrly = src[srcoff + 3];
390 float x2 = src[srcoff + 4];
391 float y2 = src[srcoff + 5];
392 if (left != null) {
393 left[leftoff + 0] = x1;
394 left[leftoff + 1] = y1;
395 }
396 if (right != null) {
397 right[rightoff + 4] = x2;
398 right[rightoff + 5] = y2;
399 }
400 x1 = x1 + t * (ctrlx - x1);
401 y1 = y1 + t * (ctrly - y1);
402 x2 = ctrlx + t * (x2 - ctrlx);
403 y2 = ctrly + t * (y2 - ctrly);
404 ctrlx = x1 + t * (x2 - x1);
405 ctrly = y1 + t * (y2 - y1);
406 if (left != null) {
407 left[leftoff + 2] = x1;
408 left[leftoff + 3] = y1;
409 left[leftoff + 4] = ctrlx;
410 left[leftoff + 5] = ctrly;
411 }
412 if (right != null) {
413 right[rightoff + 0] = ctrlx;
414 right[rightoff + 1] = ctrly;
415 right[rightoff + 2] = x2;
416 right[rightoff + 3] = y2;
417 }
418 }
419
420 static void subdivideAt(float t, float[] src, int srcoff,
421 float[] left, int leftoff,
422 float[] right, int rightoff, int size)
423 {
424 switch(size) {
425 case 8:
426 subdivideCubicAt(t, src, srcoff, left, leftoff, right, rightoff);
427 return;
428 case 6:
429 subdivideQuadAt(t, src, srcoff, left, leftoff, right, rightoff);
430 return;
431 }
432 }
433
434 // From sun.java2d.loops.GeneralRenderer:
435
436 static int outcode(final float x, final float y,
437 final float[] clipRect)
438 {
439 int code;
440 if (y < clipRect[0]) {
441 code = OUTCODE_TOP;
442 } else if (y >= clipRect[1]) {
443 code = OUTCODE_BOTTOM;
444 } else {
445 code = 0;
446 }
447 if (x < clipRect[2]) {
448 code |= OUTCODE_LEFT;
449 } else if (x >= clipRect[3]) {
450 code |= OUTCODE_RIGHT;
451 }
452 return code;
453 }
454
455 // a stack of polynomial curves where each curve shares endpoints with
456 // adjacent ones.
457 static final class PolyStack {
458 private static final byte TYPE_LINETO = (byte) 0;
459 private static final byte TYPE_QUADTO = (byte) 1;
460 private static final byte TYPE_CUBICTO = (byte) 2;
461
462 // curves capacity = edges count (8192) = edges x 2 (coords)
463 private static final int INITIAL_CURVES_COUNT = INITIAL_EDGES_COUNT << 1;
464
465 // types capacity = edges count (4096)
466 private static final int INITIAL_TYPES_COUNT = INITIAL_EDGES_COUNT;
467
468 float[] curves;
469 int end;
470 byte[] curveTypes;
471 int numCurves;
472
473 // curves ref (dirty)
474 final FloatArrayCache.Reference curves_ref;
475 // curveTypes ref (dirty)
476 final ByteArrayCache.Reference curveTypes_ref;
477
478 // used marks (stats only)
479 int curveTypesUseMark;
480 int curvesUseMark;
481
482 private final StatLong stat_polystack_types;
483 private final StatLong stat_polystack_curves;
484 private final Histogram hist_polystack_curves;
485 private final StatLong stat_array_polystack_curves;
486 private final StatLong stat_array_polystack_curveTypes;
487
488 PolyStack(final RendererContext rdrCtx) {
489 this(rdrCtx, null, null, null, null, null);
490 }
491
492 PolyStack(final RendererContext rdrCtx,
493 final StatLong stat_polystack_types,
494 final StatLong stat_polystack_curves,
495 final Histogram hist_polystack_curves,
496 final StatLong stat_array_polystack_curves,
497 final StatLong stat_array_polystack_curveTypes)
498 {
499 curves_ref = rdrCtx.newDirtyFloatArrayRef(INITIAL_CURVES_COUNT); // 32K
500 curves = curves_ref.initial;
501
502 curveTypes_ref = rdrCtx.newDirtyByteArrayRef(INITIAL_TYPES_COUNT); // 4K
503 curveTypes = curveTypes_ref.initial;
504 numCurves = 0;
505 end = 0;
506
507 if (DO_STATS) {
508 curveTypesUseMark = 0;
509 curvesUseMark = 0;
510 }
511 this.stat_polystack_types = stat_polystack_types;
512 this.stat_polystack_curves = stat_polystack_curves;
513 this.hist_polystack_curves = hist_polystack_curves;
514 this.stat_array_polystack_curves = stat_array_polystack_curves;
515 this.stat_array_polystack_curveTypes = stat_array_polystack_curveTypes;
516 }
517
518 /**
519 * Disposes this PolyStack:
520 * clean up before reusing this instance
521 */
522 void dispose() {
523 end = 0;
524 numCurves = 0;
525
526 if (DO_STATS) {
527 stat_polystack_types.add(curveTypesUseMark);
528 stat_polystack_curves.add(curvesUseMark);
529 hist_polystack_curves.add(curvesUseMark);
530
531 // reset marks
532 curveTypesUseMark = 0;
533 curvesUseMark = 0;
534 }
535
536 // Return arrays:
537 // curves and curveTypes are kept dirty
538 curves = curves_ref.putArray(curves);
539 curveTypes = curveTypes_ref.putArray(curveTypes);
540 }
541
542 private void ensureSpace(final int n) {
543 // use substraction to avoid integer overflow:
544 if (curves.length - end < n) {
545 if (DO_STATS) {
546 stat_array_polystack_curves.add(end + n);
547 }
548 curves = curves_ref.widenArray(curves, end, end + n);
549 }
550 if (curveTypes.length <= numCurves) {
551 if (DO_STATS) {
552 stat_array_polystack_curveTypes.add(numCurves + 1);
553 }
554 curveTypes = curveTypes_ref.widenArray(curveTypes,
555 numCurves,
556 numCurves + 1);
557 }
558 }
559
560 void pushCubic(float x0, float y0,
561 float x1, float y1,
562 float x2, float y2)
563 {
564 ensureSpace(6);
565 curveTypes[numCurves++] = TYPE_CUBICTO;
566 // we reverse the coordinate order to make popping easier
567 final float[] _curves = curves;
568 int e = end;
569 _curves[e++] = x2; _curves[e++] = y2;
570 _curves[e++] = x1; _curves[e++] = y1;
571 _curves[e++] = x0; _curves[e++] = y0;
572 end = e;
573 }
574
575 void pushQuad(float x0, float y0,
576 float x1, float y1)
577 {
578 ensureSpace(4);
579 curveTypes[numCurves++] = TYPE_QUADTO;
580 final float[] _curves = curves;
581 int e = end;
582 _curves[e++] = x1; _curves[e++] = y1;
583 _curves[e++] = x0; _curves[e++] = y0;
584 end = e;
585 }
586
587 void pushLine(float x, float y) {
588 ensureSpace(2);
589 curveTypes[numCurves++] = TYPE_LINETO;
590 curves[end++] = x; curves[end++] = y;
591 }
592
593 void pullAll(final PathConsumer2D io) {
594 final int nc = numCurves;
595 if (nc == 0) {
596 return;
597 }
598 if (DO_STATS) {
599 // update used marks:
600 if (numCurves > curveTypesUseMark) {
601 curveTypesUseMark = numCurves;
602 }
603 if (end > curvesUseMark) {
604 curvesUseMark = end;
605 }
606 }
607 final byte[] _curveTypes = curveTypes;
608 final float[] _curves = curves;
609 int e = 0;
610
611 for (int i = 0; i < nc; i++) {
612 switch(_curveTypes[i]) {
613 case TYPE_LINETO:
614 io.lineTo(_curves[e], _curves[e+1]);
615 e += 2;
616 continue;
617 case TYPE_QUADTO:
618 io.quadTo(_curves[e+0], _curves[e+1],
619 _curves[e+2], _curves[e+3]);
620 e += 4;
621 continue;
622 case TYPE_CUBICTO:
623 io.curveTo(_curves[e+0], _curves[e+1],
624 _curves[e+2], _curves[e+3],
625 _curves[e+4], _curves[e+5]);
626 e += 6;
627 continue;
628 default:
629 }
630 }
631 numCurves = 0;
632 end = 0;
633 }
634
635 void popAll(final PathConsumer2D io) {
636 int nc = numCurves;
637 if (nc == 0) {
638 return;
639 }
640 if (DO_STATS) {
641 // update used marks:
642 if (numCurves > curveTypesUseMark) {
643 curveTypesUseMark = numCurves;
644 }
645 if (end > curvesUseMark) {
646 curvesUseMark = end;
647 }
648 }
649 final byte[] _curveTypes = curveTypes;
650 final float[] _curves = curves;
651 int e = end;
652
653 while (nc != 0) {
654 switch(_curveTypes[--nc]) {
655 case TYPE_LINETO:
656 e -= 2;
657 io.lineTo(_curves[e], _curves[e+1]);
658 continue;
659 case TYPE_QUADTO:
660 e -= 4;
661 io.quadTo(_curves[e+0], _curves[e+1],
662 _curves[e+2], _curves[e+3]);
663 continue;
664 case TYPE_CUBICTO:
665 e -= 6;
666 io.curveTo(_curves[e+0], _curves[e+1],
667 _curves[e+2], _curves[e+3],
668 _curves[e+4], _curves[e+5]);
669 continue;
670 default:
671 }
672 }
673 numCurves = 0;
674 end = 0;
675 }
676
677 @Override
678 public String toString() {
679 String ret = "";
680 int nc = numCurves;
681 int last = end;
682 int len;
683 while (nc != 0) {
684 switch(curveTypes[--nc]) {
685 case TYPE_LINETO:
686 len = 2;
687 ret += "line: ";
688 break;
689 case TYPE_QUADTO:
690 len = 4;
691 ret += "quad: ";
692 break;
693 case TYPE_CUBICTO:
694 len = 6;
695 ret += "cubic: ";
696 break;
697 default:
698 len = 0;
699 }
700 last -= len;
701 ret += Arrays.toString(Arrays.copyOfRange(curves, last, last+len))
702 + "\n";
703 }
704 return ret;
705 }
706 }
707
708 // a stack of integer indices
709 static final class IndexStack {
710
711 // integer capacity = edges count / 4 ~ 1024
712 private static final int INITIAL_COUNT = INITIAL_EDGES_COUNT >> 2;
713
714 private int end;
715 private int[] indices;
716
717 // indices ref (dirty)
718 private final IntArrayCache.Reference indices_ref;
719
720 // used marks (stats only)
721 private int indicesUseMark;
722
723 private final StatLong stat_idxstack_indices;
724 private final Histogram hist_idxstack_indices;
725 private final StatLong stat_array_idxstack_indices;
726
727 IndexStack(final RendererContext rdrCtx) {
728 this(rdrCtx, null, null, null);
729 }
730
731 IndexStack(final RendererContext rdrCtx,
732 final StatLong stat_idxstack_indices,
733 final Histogram hist_idxstack_indices,
734 final StatLong stat_array_idxstack_indices)
735 {
736 indices_ref = rdrCtx.newDirtyIntArrayRef(INITIAL_COUNT); // 4K
737 indices = indices_ref.initial;
738 end = 0;
739
740 if (DO_STATS) {
741 indicesUseMark = 0;
742 }
743 this.stat_idxstack_indices = stat_idxstack_indices;
744 this.hist_idxstack_indices = hist_idxstack_indices;
745 this.stat_array_idxstack_indices = stat_array_idxstack_indices;
746 }
747
748 /**
749 * Disposes this PolyStack:
750 * clean up before reusing this instance
751 */
752 void dispose() {
753 end = 0;
754
755 if (DO_STATS) {
756 stat_idxstack_indices.add(indicesUseMark);
757 hist_idxstack_indices.add(indicesUseMark);
758
759 // reset marks
760 indicesUseMark = 0;
761 }
762
763 // Return arrays:
764 // values is kept dirty
765 indices = indices_ref.putArray(indices);
766 }
767
768 boolean isEmpty() {
769 return (end == 0);
770 }
771
772 void reset() {
773 end = 0;
774 }
775
776 void push(final int v) {
777 // remove redundant values (reverse order):
778 int[] _values = indices;
779 final int nc = end;
780 if (nc != 0) {
781 if (_values[nc - 1] == v) {
782 // remove both duplicated values:
783 end--;
784 return;
785 }
786 }
787 if (_values.length <= nc) {
788 if (DO_STATS) {
789 stat_array_idxstack_indices.add(nc + 1);
790 }
791 indices = _values = indices_ref.widenArray(_values, nc, nc + 1);
792 }
793 _values[end++] = v;
794
795 if (DO_STATS) {
796 // update used marks:
797 if (end > indicesUseMark) {
798 indicesUseMark = end;
799 }
800 }
801 }
802
803 void pullAll(final float[] points, final PathConsumer2D io) {
804 final int nc = end;
805 if (nc == 0) {
806 return;
807 }
808 final int[] _values = indices;
809
810 for (int i = 0, j; i < nc; i++) {
811 j = _values[i] << 1;
812 io.lineTo(points[j], points[j + 1]);
813 }
814 end = 0;
815 }
816 }
817 }