1/*
2 * Copyright 2006 The Android Open Source Project
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8#include "src/core/SkBlitter.h"
9
10#include "include/core/SkColor.h"
11#include "include/core/SkColorFilter.h"
12#include "include/core/SkString.h"
13#include "include/private/SkColorData.h"
14#include "include/private/SkTo.h"
15#include "src/core/SkAntiRun.h"
16#include "src/core/SkArenaAlloc.h"
17#include "src/core/SkMask.h"
18#include "src/core/SkMaskFilterBase.h"
19#include "src/core/SkMatrixProvider.h"
20#include "src/core/SkPaintPriv.h"
21#include "src/core/SkReadBuffer.h"
22#include "src/core/SkRegionPriv.h"
23#include "src/core/SkTLazy.h"
24#include "src/core/SkUtils.h"
25#include "src/core/SkWriteBuffer.h"
26#include "src/core/SkXfermodeInterpretation.h"
27#include "src/shaders/SkShaderBase.h"
28
29// Hacks for testing.
30bool gUseSkVMBlitter{false};
31bool gSkForceRasterPipelineBlitter{false};
32
33SkBlitter::~SkBlitter() {}
34
35bool SkBlitter::isNullBlitter() const { return false; }
36
37const SkPixmap* SkBlitter::justAnOpaqueColor(uint32_t* value) {
38 return nullptr;
39}
40
41/*
42void SkBlitter::blitH(int x, int y, int width) {
43 SkDEBUGFAIL("unimplemented");
44}
45
46
47void SkBlitter::blitAntiH(int x, int y, const SkAlpha antialias[],
48 const int16_t runs[]) {
49 SkDEBUGFAIL("unimplemented");
50}
51 */
52
53inline static SkAlpha ScalarToAlpha(SkScalar a) {
54 SkAlpha alpha = (SkAlpha)(a * 255);
55 return alpha > 247 ? 0xFF : alpha < 8 ? 0 : alpha;
56}
57
58void SkBlitter::blitFatAntiRect(const SkRect& rect) {
59 SkIRect bounds = rect.roundOut();
60 SkASSERT(bounds.width() >= 3);
61
62 // skbug.com/7813
63 // To ensure consistency of the threaded backend (a rect that's considered fat in the init-once
64 // phase must also be considered fat in the draw phase), we have to deal with rects with small
65 // heights because the horizontal tiling in the threaded backend may change the height.
66 //
67 // This also implies that we cannot do vertical tiling unless we can blit any rect (not just the
68 // fat one.)
69 if (bounds.height() == 0) {
70 return;
71 }
72
73 int runSize = bounds.width() + 1; // +1 so we can set runs[bounds.width()] = 0
74 void* storage = this->allocBlitMemory(runSize * (sizeof(int16_t) + sizeof(SkAlpha)));
75 int16_t* runs = reinterpret_cast<int16_t*>(storage);
76 SkAlpha* alphas = reinterpret_cast<SkAlpha*>(runs + runSize);
77
78 runs[0] = 1;
79 runs[1] = bounds.width() - 2;
80 runs[bounds.width() - 1] = 1;
81 runs[bounds.width()] = 0;
82
83 SkScalar partialL = bounds.fLeft + 1 - rect.fLeft;
84 SkScalar partialR = rect.fRight - (bounds.fRight - 1);
85 SkScalar partialT = bounds.fTop + 1 - rect.fTop;
86 SkScalar partialB = rect.fBottom - (bounds.fBottom - 1);
87
88 if (bounds.height() == 1) {
89 partialT = rect.fBottom - rect.fTop;
90 }
91
92 alphas[0] = ScalarToAlpha(partialL * partialT);
93 alphas[1] = ScalarToAlpha(partialT);
94 alphas[bounds.width() - 1] = ScalarToAlpha(partialR * partialT);
95 this->blitAntiH(bounds.fLeft, bounds.fTop, alphas, runs);
96
97 if (bounds.height() > 2) {
98 this->blitAntiRect(bounds.fLeft, bounds.fTop + 1, bounds.width() - 2, bounds.height() - 2,
99 ScalarToAlpha(partialL), ScalarToAlpha(partialR));
100 }
101
102 if (bounds.height() > 1) {
103 alphas[0] = ScalarToAlpha(partialL * partialB);
104 alphas[1] = ScalarToAlpha(partialB);
105 alphas[bounds.width() - 1] = ScalarToAlpha(partialR * partialB);
106 this->blitAntiH(bounds.fLeft, bounds.fBottom - 1, alphas, runs);
107 }
108}
109
110void SkBlitter::blitV(int x, int y, int height, SkAlpha alpha) {
111 if (alpha == 255) {
112 this->blitRect(x, y, 1, height);
113 } else {
114 int16_t runs[2];
115 runs[0] = 1;
116 runs[1] = 0;
117
118 while (--height >= 0) {
119 this->blitAntiH(x, y++, &alpha, runs);
120 }
121 }
122}
123
124void SkBlitter::blitRect(int x, int y, int width, int height) {
125 SkASSERT(width > 0);
126 while (--height >= 0) {
127 this->blitH(x, y++, width);
128 }
129}
130
131/// Default implementation doesn't check for easy optimizations
132/// such as alpha == 255; also uses blitV(), which some subclasses
133/// may not support.
134void SkBlitter::blitAntiRect(int x, int y, int width, int height,
135 SkAlpha leftAlpha, SkAlpha rightAlpha) {
136 if (leftAlpha > 0) { // we may send in x = -1 with leftAlpha = 0
137 this->blitV(x, y, height, leftAlpha);
138 }
139 x++;
140 if (width > 0) {
141 this->blitRect(x, y, width, height);
142 x += width;
143 }
144 if (rightAlpha > 0) {
145 this->blitV(x, y, height, rightAlpha);
146 }
147}
148
149//////////////////////////////////////////////////////////////////////////////
150
151static inline void bits_to_runs(SkBlitter* blitter, int x, int y,
152 const uint8_t bits[],
153 uint8_t left_mask, ptrdiff_t rowBytes,
154 uint8_t right_mask) {
155 int inFill = 0;
156 int pos = 0;
157
158 while (--rowBytes >= 0) {
159 uint8_t b = *bits++ & left_mask;
160 if (rowBytes == 0) {
161 b &= right_mask;
162 }
163
164 for (uint8_t test = 0x80U; test != 0; test >>= 1) {
165 if (b & test) {
166 if (!inFill) {
167 pos = x;
168 inFill = true;
169 }
170 } else {
171 if (inFill) {
172 blitter->blitH(pos, y, x - pos);
173 inFill = false;
174 }
175 }
176 x += 1;
177 }
178 left_mask = 0xFFU;
179 }
180
181 // final cleanup
182 if (inFill) {
183 blitter->blitH(pos, y, x - pos);
184 }
185}
186
187// maskBitCount is the number of 1's to place in the mask. It must be in the range between 1 and 8.
188static uint8_t generate_right_mask(int maskBitCount) {
189 return static_cast<uint8_t>((0xFF00U >> maskBitCount) & 0xFF);
190}
191
192void SkBlitter::blitMask(const SkMask& mask, const SkIRect& clip) {
193 SkASSERT(mask.fBounds.contains(clip));
194
195 if (mask.fFormat == SkMask::kLCD16_Format) {
196 return; // needs to be handled by subclass
197 }
198
199 if (mask.fFormat == SkMask::kBW_Format) {
200 int cx = clip.fLeft;
201 int cy = clip.fTop;
202 int maskLeft = mask.fBounds.fLeft;
203 int maskRowBytes = mask.fRowBytes;
204 int height = clip.height();
205
206 const uint8_t* bits = mask.getAddr1(cx, cy);
207
208 SkDEBUGCODE(const uint8_t* endOfImage =
209 mask.fImage + (mask.fBounds.height() - 1) * maskRowBytes
210 + ((mask.fBounds.width() + 7) >> 3));
211
212 if (cx == maskLeft && clip.fRight == mask.fBounds.fRight) {
213 while (--height >= 0) {
214 int affectedRightBit = mask.fBounds.width() - 1;
215 ptrdiff_t rowBytes = (affectedRightBit >> 3) + 1;
216 SkASSERT(bits + rowBytes <= endOfImage);
217 U8CPU rightMask = generate_right_mask((affectedRightBit & 7) + 1);
218 bits_to_runs(this, cx, cy, bits, 0xFF, rowBytes, rightMask);
219 bits += maskRowBytes;
220 cy += 1;
221 }
222 } else {
223 // Bits is calculated as the offset into the mask at the point {cx, cy} therefore, all
224 // addressing into the bit mask is relative to that point. Since this is an address
225 // calculated from a arbitrary bit in that byte, calculate the left most bit.
226 int bitsLeft = cx - ((cx - maskLeft) & 7);
227
228 // Everything is relative to the bitsLeft.
229 int leftEdge = cx - bitsLeft;
230 SkASSERT(leftEdge >= 0);
231 int rightEdge = clip.fRight - bitsLeft;
232 SkASSERT(rightEdge > leftEdge);
233
234 // Calculate left byte and mask
235 const uint8_t* leftByte = bits;
236 U8CPU leftMask = 0xFFU >> (leftEdge & 7);
237
238 // Calculate right byte and mask
239 int affectedRightBit = rightEdge - 1;
240 const uint8_t* rightByte = bits + (affectedRightBit >> 3);
241 U8CPU rightMask = generate_right_mask((affectedRightBit & 7) + 1);
242
243 // leftByte and rightByte are byte locations therefore, to get a count of bytes the
244 // code must add one.
245 ptrdiff_t rowBytes = rightByte - leftByte + 1;
246
247 while (--height >= 0) {
248 SkASSERT(bits + rowBytes <= endOfImage);
249 bits_to_runs(this, bitsLeft, cy, bits, leftMask, rowBytes, rightMask);
250 bits += maskRowBytes;
251 cy += 1;
252 }
253 }
254 } else {
255 int width = clip.width();
256 SkAutoSTMalloc<64, int16_t> runStorage(width + 1);
257 int16_t* runs = runStorage.get();
258 const uint8_t* aa = mask.getAddr8(clip.fLeft, clip.fTop);
259
260 sk_memset16((uint16_t*)runs, 1, width);
261 runs[width] = 0;
262
263 int height = clip.height();
264 int y = clip.fTop;
265 while (--height >= 0) {
266 this->blitAntiH(clip.fLeft, y, aa, runs);
267 aa += mask.fRowBytes;
268 y += 1;
269 }
270 }
271}
272
273/////////////////////// these are not virtual, just helpers
274
275void SkBlitter::blitMaskRegion(const SkMask& mask, const SkRegion& clip) {
276 if (clip.quickReject(mask.fBounds)) {
277 return;
278 }
279
280 SkRegion::Cliperator clipper(clip, mask.fBounds);
281
282 while (!clipper.done()) {
283 const SkIRect& cr = clipper.rect();
284 this->blitMask(mask, cr);
285 clipper.next();
286 }
287}
288
289void SkBlitter::blitRectRegion(const SkIRect& rect, const SkRegion& clip) {
290 SkRegion::Cliperator clipper(clip, rect);
291
292 while (!clipper.done()) {
293 const SkIRect& cr = clipper.rect();
294 this->blitRect(cr.fLeft, cr.fTop, cr.width(), cr.height());
295 clipper.next();
296 }
297}
298
299void SkBlitter::blitRegion(const SkRegion& clip) {
300 SkRegionPriv::VisitSpans(clip, [this](const SkIRect& r) {
301 this->blitRect(r.left(), r.top(), r.width(), r.height());
302 });
303}
304
305///////////////////////////////////////////////////////////////////////////////
306
307void SkNullBlitter::blitH(int x, int y, int width) {}
308
309void SkNullBlitter::blitAntiH(int x, int y, const SkAlpha antialias[],
310 const int16_t runs[]) {}
311
312void SkNullBlitter::blitV(int x, int y, int height, SkAlpha alpha) {}
313
314void SkNullBlitter::blitRect(int x, int y, int width, int height) {}
315
316void SkNullBlitter::blitMask(const SkMask& mask, const SkIRect& clip) {}
317
318const SkPixmap* SkNullBlitter::justAnOpaqueColor(uint32_t* value) {
319 return nullptr;
320}
321
322bool SkNullBlitter::isNullBlitter() const { return true; }
323
324///////////////////////////////////////////////////////////////////////////////
325
326static int compute_anti_width(const int16_t runs[]) {
327 int width = 0;
328
329 for (;;) {
330 int count = runs[0];
331
332 SkASSERT(count >= 0);
333 if (count == 0) {
334 break;
335 }
336 width += count;
337 runs += count;
338 }
339 return width;
340}
341
342static inline bool y_in_rect(int y, const SkIRect& rect) {
343 return (unsigned)(y - rect.fTop) < (unsigned)rect.height();
344}
345
346static inline bool x_in_rect(int x, const SkIRect& rect) {
347 return (unsigned)(x - rect.fLeft) < (unsigned)rect.width();
348}
349
350void SkRectClipBlitter::blitH(int left, int y, int width) {
351 SkASSERT(width > 0);
352
353 if (!y_in_rect(y, fClipRect)) {
354 return;
355 }
356
357 int right = left + width;
358
359 if (left < fClipRect.fLeft) {
360 left = fClipRect.fLeft;
361 }
362 if (right > fClipRect.fRight) {
363 right = fClipRect.fRight;
364 }
365
366 width = right - left;
367 if (width > 0) {
368 fBlitter->blitH(left, y, width);
369 }
370}
371
372void SkRectClipBlitter::blitAntiH(int left, int y, const SkAlpha aa[],
373 const int16_t runs[]) {
374 if (!y_in_rect(y, fClipRect) || left >= fClipRect.fRight) {
375 return;
376 }
377
378 int x0 = left;
379 int x1 = left + compute_anti_width(runs);
380
381 if (x1 <= fClipRect.fLeft) {
382 return;
383 }
384
385 SkASSERT(x0 < x1);
386 if (x0 < fClipRect.fLeft) {
387 int dx = fClipRect.fLeft - x0;
388 SkAlphaRuns::BreakAt((int16_t*)runs, (uint8_t*)aa, dx);
389 runs += dx;
390 aa += dx;
391 x0 = fClipRect.fLeft;
392 }
393
394 SkASSERT(x0 < x1 && runs[x1 - x0] == 0);
395 if (x1 > fClipRect.fRight) {
396 x1 = fClipRect.fRight;
397 SkAlphaRuns::BreakAt((int16_t*)runs, (uint8_t*)aa, x1 - x0);
398 ((int16_t*)runs)[x1 - x0] = 0;
399 }
400
401 SkASSERT(x0 < x1 && runs[x1 - x0] == 0);
402 SkASSERT(compute_anti_width(runs) == x1 - x0);
403
404 fBlitter->blitAntiH(x0, y, aa, runs);
405}
406
407void SkRectClipBlitter::blitV(int x, int y, int height, SkAlpha alpha) {
408 SkASSERT(height > 0);
409
410 if (!x_in_rect(x, fClipRect)) {
411 return;
412 }
413
414 int y0 = y;
415 int y1 = y + height;
416
417 if (y0 < fClipRect.fTop) {
418 y0 = fClipRect.fTop;
419 }
420 if (y1 > fClipRect.fBottom) {
421 y1 = fClipRect.fBottom;
422 }
423
424 if (y0 < y1) {
425 fBlitter->blitV(x, y0, y1 - y0, alpha);
426 }
427}
428
429void SkRectClipBlitter::blitRect(int left, int y, int width, int height) {
430 SkIRect r;
431
432 r.setLTRB(left, y, left + width, y + height);
433 if (r.intersect(fClipRect)) {
434 fBlitter->blitRect(r.fLeft, r.fTop, r.width(), r.height());
435 }
436}
437
438void SkRectClipBlitter::blitAntiRect(int left, int y, int width, int height,
439 SkAlpha leftAlpha, SkAlpha rightAlpha) {
440 SkIRect r;
441
442 // The *true* width of the rectangle blitted is width+2:
443 r.setLTRB(left, y, left + width + 2, y + height);
444 if (r.intersect(fClipRect)) {
445 if (r.fLeft != left) {
446 SkASSERT(r.fLeft > left);
447 leftAlpha = 255;
448 }
449 if (r.fRight != left + width + 2) {
450 SkASSERT(r.fRight < left + width + 2);
451 rightAlpha = 255;
452 }
453 if (255 == leftAlpha && 255 == rightAlpha) {
454 fBlitter->blitRect(r.fLeft, r.fTop, r.width(), r.height());
455 } else if (1 == r.width()) {
456 if (r.fLeft == left) {
457 fBlitter->blitV(r.fLeft, r.fTop, r.height(), leftAlpha);
458 } else {
459 SkASSERT(r.fLeft == left + width + 1);
460 fBlitter->blitV(r.fLeft, r.fTop, r.height(), rightAlpha);
461 }
462 } else {
463 fBlitter->blitAntiRect(r.fLeft, r.fTop, r.width() - 2, r.height(),
464 leftAlpha, rightAlpha);
465 }
466 }
467}
468
469void SkRectClipBlitter::blitMask(const SkMask& mask, const SkIRect& clip) {
470 SkASSERT(mask.fBounds.contains(clip));
471
472 SkIRect r = clip;
473
474 if (r.intersect(fClipRect)) {
475 fBlitter->blitMask(mask, r);
476 }
477}
478
479const SkPixmap* SkRectClipBlitter::justAnOpaqueColor(uint32_t* value) {
480 return fBlitter->justAnOpaqueColor(value);
481}
482
483///////////////////////////////////////////////////////////////////////////////
484
485void SkRgnClipBlitter::blitH(int x, int y, int width) {
486 SkRegion::Spanerator span(*fRgn, y, x, x + width);
487 int left, right;
488
489 while (span.next(&left, &right)) {
490 SkASSERT(left < right);
491 fBlitter->blitH(left, y, right - left);
492 }
493}
494
495void SkRgnClipBlitter::blitAntiH(int x, int y, const SkAlpha aa[],
496 const int16_t runs[]) {
497 int width = compute_anti_width(runs);
498 SkRegion::Spanerator span(*fRgn, y, x, x + width);
499 int left, right;
500 SkDEBUGCODE(const SkIRect& bounds = fRgn->getBounds();)
501
502 int prevRite = x;
503 while (span.next(&left, &right)) {
504 SkASSERT(x <= left);
505 SkASSERT(left < right);
506 SkASSERT(left >= bounds.fLeft && right <= bounds.fRight);
507
508 SkAlphaRuns::Break((int16_t*)runs, (uint8_t*)aa, left - x, right - left);
509
510 // now zero before left
511 if (left > prevRite) {
512 int index = prevRite - x;
513 ((uint8_t*)aa)[index] = 0; // skip runs after right
514 ((int16_t*)runs)[index] = SkToS16(left - prevRite);
515 }
516
517 prevRite = right;
518 }
519
520 if (prevRite > x) {
521 ((int16_t*)runs)[prevRite - x] = 0;
522
523 if (x < 0) {
524 int skip = runs[0];
525 SkASSERT(skip >= -x);
526 aa += skip;
527 runs += skip;
528 x += skip;
529 }
530 fBlitter->blitAntiH(x, y, aa, runs);
531 }
532}
533
534void SkRgnClipBlitter::blitV(int x, int y, int height, SkAlpha alpha) {
535 SkIRect bounds;
536 bounds.setXYWH(x, y, 1, height);
537
538 SkRegion::Cliperator iter(*fRgn, bounds);
539
540 while (!iter.done()) {
541 const SkIRect& r = iter.rect();
542 SkASSERT(bounds.contains(r));
543
544 fBlitter->blitV(x, r.fTop, r.height(), alpha);
545 iter.next();
546 }
547}
548
549void SkRgnClipBlitter::blitRect(int x, int y, int width, int height) {
550 SkIRect bounds;
551 bounds.setXYWH(x, y, width, height);
552
553 SkRegion::Cliperator iter(*fRgn, bounds);
554
555 while (!iter.done()) {
556 const SkIRect& r = iter.rect();
557 SkASSERT(bounds.contains(r));
558
559 fBlitter->blitRect(r.fLeft, r.fTop, r.width(), r.height());
560 iter.next();
561 }
562}
563
564void SkRgnClipBlitter::blitAntiRect(int x, int y, int width, int height,
565 SkAlpha leftAlpha, SkAlpha rightAlpha) {
566 // The *true* width of the rectangle to blit is width + 2
567 SkIRect bounds;
568 bounds.setXYWH(x, y, width + 2, height);
569
570 SkRegion::Cliperator iter(*fRgn, bounds);
571
572 while (!iter.done()) {
573 const SkIRect& r = iter.rect();
574 SkASSERT(bounds.contains(r));
575 SkASSERT(r.fLeft >= x);
576 SkASSERT(r.fRight <= x + width + 2);
577
578 SkAlpha effectiveLeftAlpha = (r.fLeft == x) ? leftAlpha : 255;
579 SkAlpha effectiveRightAlpha = (r.fRight == x + width + 2) ?
580 rightAlpha : 255;
581
582 if (255 == effectiveLeftAlpha && 255 == effectiveRightAlpha) {
583 fBlitter->blitRect(r.fLeft, r.fTop, r.width(), r.height());
584 } else if (1 == r.width()) {
585 if (r.fLeft == x) {
586 fBlitter->blitV(r.fLeft, r.fTop, r.height(),
587 effectiveLeftAlpha);
588 } else {
589 SkASSERT(r.fLeft == x + width + 1);
590 fBlitter->blitV(r.fLeft, r.fTop, r.height(),
591 effectiveRightAlpha);
592 }
593 } else {
594 fBlitter->blitAntiRect(r.fLeft, r.fTop, r.width() - 2, r.height(),
595 effectiveLeftAlpha, effectiveRightAlpha);
596 }
597 iter.next();
598 }
599}
600
601
602void SkRgnClipBlitter::blitMask(const SkMask& mask, const SkIRect& clip) {
603 SkASSERT(mask.fBounds.contains(clip));
604
605 SkRegion::Cliperator iter(*fRgn, clip);
606 const SkIRect& r = iter.rect();
607 SkBlitter* blitter = fBlitter;
608
609 while (!iter.done()) {
610 blitter->blitMask(mask, r);
611 iter.next();
612 }
613}
614
615const SkPixmap* SkRgnClipBlitter::justAnOpaqueColor(uint32_t* value) {
616 return fBlitter->justAnOpaqueColor(value);
617}
618
619///////////////////////////////////////////////////////////////////////////////
620
621SkBlitter* SkBlitterClipper::apply(SkBlitter* blitter, const SkRegion* clip,
622 const SkIRect* ir) {
623 if (clip) {
624 const SkIRect& clipR = clip->getBounds();
625
626 if (clip->isEmpty() || (ir && !SkIRect::Intersects(clipR, *ir))) {
627 blitter = &fNullBlitter;
628 } else if (clip->isRect()) {
629 if (ir == nullptr || !clipR.contains(*ir)) {
630 fRectBlitter.init(blitter, clipR);
631 blitter = &fRectBlitter;
632 }
633 } else {
634 fRgnBlitter.init(blitter, clip);
635 blitter = &fRgnBlitter;
636 }
637 }
638 return blitter;
639}
640
641///////////////////////////////////////////////////////////////////////////////
642
643#include "src/core/SkCoreBlitters.h"
644
645bool SkBlitter::UseRasterPipelineBlitter(const SkPixmap& device, const SkPaint& paint,
646 const SkMatrix& matrix) {
647 if (gSkForceRasterPipelineBlitter) {
648 return true;
649 }
650#if 0 || defined(SK_FORCE_RASTER_PIPELINE_BLITTER)
651 return true;
652#else
653
654 const SkMaskFilterBase* mf = as_MFB(paint.getMaskFilter());
655
656 // The legacy blitters cannot handle any of these complex features (anymore).
657 if (device.alphaType() == kUnpremul_SkAlphaType ||
658 paint.getBlendMode() > SkBlendMode::kLastCoeffMode ||
659 (mf && mf->getFormat() == SkMask::k3D_Format)) {
660 return true;
661 }
662
663 // All the real legacy fast paths are for shaders and SrcOver.
664 // Choosing SkRasterPipelineBlitter will also let us to hit its single-color memset path.
665 if (!paint.getShader() && paint.getBlendMode() != SkBlendMode::kSrcOver) {
666 return true;
667 }
668
669 auto cs = device.colorSpace();
670 // We check (indirectly via makeContext()) later on if the shader can handle the colorspace
671 // in legacy mode, so here we just focus on if a single color needs raster-pipeline.
672 if (cs && !paint.getShader()) {
673 if (!paint.getColor4f().fitsInBytes() || !cs->isSRGB()) {
674 return true;
675 }
676 }
677
678 // Only kN32 and 565 are handled by legacy blitters now, 565 mostly just for Android.
679 return device.colorType() != kN32_SkColorType
680 && device.colorType() != kRGB_565_SkColorType;
681#endif
682}
683
684SkBlitter* SkBlitter::Choose(const SkPixmap& device,
685 const SkMatrixProvider& matrixProvider,
686 const SkPaint& origPaint,
687 SkArenaAlloc* alloc,
688 bool drawCoverage,
689 sk_sp<SkShader> clipShader) {
690 SkASSERT(alloc);
691
692 if (kUnknown_SkColorType == device.colorType()) {
693 return alloc->make<SkNullBlitter>();
694 }
695
696 // We may tweak the original paint as we go.
697 SkTCopyOnFirstWrite<SkPaint> paint(origPaint);
698
699 // We have the most fast-paths for SrcOver, so see if we can act like SrcOver.
700 if (paint->getBlendMode() != SkBlendMode::kSrcOver) {
701 switch (SkInterpretXfermode(*paint, SkColorTypeIsAlwaysOpaque(device.colorType()))) {
702 case kSrcOver_SkXfermodeInterpretation:
703 paint.writable()->setBlendMode(SkBlendMode::kSrcOver);
704 break;
705 case kSkipDrawing_SkXfermodeInterpretation:
706 return alloc->make<SkNullBlitter>();
707 default:
708 break;
709 }
710 }
711
712 // A Clear blend mode will ignore the entire color pipeline, as if Src mode with 0x00000000.
713 if (paint->getBlendMode() == SkBlendMode::kClear) {
714 SkPaint* p = paint.writable();
715 p->setShader(nullptr);
716 p->setColorFilter(nullptr);
717 p->setBlendMode(SkBlendMode::kSrc);
718 p->setColor(0x00000000);
719 }
720
721 if (paint->getColorFilter()) {
722 SkPaintPriv::RemoveColorFilter(paint.writable(), device.colorSpace());
723 }
724 SkASSERT(!paint->getColorFilter());
725
726 if (drawCoverage) {
727 if (device.colorType() == kAlpha_8_SkColorType) {
728 SkASSERT(!paint->getShader());
729 SkASSERT(paint->isSrcOver());
730 return alloc->make<SkA8_Coverage_Blitter>(device, *paint);
731 }
732 return alloc->make<SkNullBlitter>();
733 }
734
735 if (paint->isDither() && !SkPaintPriv::ShouldDither(*paint, device.colorType())) {
736 paint.writable()->setDither(false);
737 }
738
739 if (gUseSkVMBlitter) {
740 if (auto blitter = SkCreateSkVMBlitter(device, *paint, matrixProvider,
741 alloc, clipShader)) {
742 return blitter;
743 }
744 }
745
746 // Same basic idea used a few times: try SkRP, then try SkVM, then give up with a null-blitter.
747 // (Setting gUseSkVMBlitter is the only way we prefer SkVM over SkRP at the moment.)
748 auto create_SkRP_or_SkVMBlitter = [&]() -> SkBlitter* {
749 if (auto blitter = SkCreateRasterPipelineBlitter(device, *paint, matrixProvider,
750 alloc, clipShader)) {
751 return blitter;
752 }
753 if (auto blitter = SkCreateSkVMBlitter(device, *paint, matrixProvider,
754 alloc, clipShader)) {
755 return blitter;
756 }
757 return alloc->make<SkNullBlitter>();
758 };
759
760 SkMatrix ctm = matrixProvider.localToDevice();
761 // We'll end here for many interesting cases: color spaces, color filters, most color types.
762 if (UseRasterPipelineBlitter(device, *paint, ctm) || clipShader) {
763 return create_SkRP_or_SkVMBlitter();
764 }
765
766 // Everything but legacy kN32_SkColorType and kRGB_565_SkColorType should already be handled.
767 SkASSERT(device.colorType() == kN32_SkColorType ||
768 device.colorType() == kRGB_565_SkColorType);
769
770 // And we should either have a shader, be blending with SrcOver, or both.
771 SkASSERT(paint->getShader() || paint->getBlendMode() == SkBlendMode::kSrcOver);
772
773 // Legacy blitters keep their shader state on a shader context.
774 SkShaderBase::Context* shaderContext = nullptr;
775 if (paint->getShader()) {
776 shaderContext = as_SB(paint->getShader())->makeContext(
777 {*paint, ctm, nullptr, device.colorType(), device.colorSpace()},
778 alloc);
779
780 // Creating the context isn't always possible... try fallbacks before giving up.
781 if (!shaderContext) {
782 return create_SkRP_or_SkVMBlitter();
783 }
784 }
785
786 switch (device.colorType()) {
787 case kN32_SkColorType:
788 if (shaderContext) {
789 return alloc->make<SkARGB32_Shader_Blitter>(device, *paint, shaderContext);
790 } else if (paint->getColor() == SK_ColorBLACK) {
791 return alloc->make<SkARGB32_Black_Blitter>(device, *paint);
792 } else if (paint->getAlpha() == 0xFF) {
793 return alloc->make<SkARGB32_Opaque_Blitter>(device, *paint);
794 } else {
795 return alloc->make<SkARGB32_Blitter>(device, *paint);
796 }
797
798 case kRGB_565_SkColorType:
799 if (shaderContext && SkRGB565_Shader_Blitter::Supports(device, *paint)) {
800 return alloc->make<SkRGB565_Shader_Blitter>(device, *paint, shaderContext);
801 } else {
802 return create_SkRP_or_SkVMBlitter();
803 }
804
805 default:
806 SkASSERT(false);
807 return alloc->make<SkNullBlitter>();
808 }
809}
810
811///////////////////////////////////////////////////////////////////////////////
812
813SkShaderBlitter::SkShaderBlitter(const SkPixmap& device, const SkPaint& paint,
814 SkShaderBase::Context* shaderContext)
815 : INHERITED(device)
816 , fShader(paint.getShader())
817 , fShaderContext(shaderContext) {
818 SkASSERT(fShader);
819 SkASSERT(fShaderContext);
820
821 fShader->ref();
822 fShaderFlags = fShaderContext->getFlags();
823 fConstInY = SkToBool(fShaderFlags & SkShaderBase::kConstInY32_Flag);
824}
825
826SkShaderBlitter::~SkShaderBlitter() {
827 fShader->unref();
828}
829
830///////////////////////////////////////////////////////////////////////////////////////////////////
831
832#ifdef SK_DEBUG
833
834void SkRectClipCheckBlitter::blitH(int x, int y, int width) {
835 SkASSERT(fClipRect.contains(SkIRect::MakeXYWH(x, y, width, 1)));
836 fBlitter->blitH(x, y, width);
837}
838
839void SkRectClipCheckBlitter::blitAntiH(int x, int y, const SkAlpha aa[], const int16_t runs[]) {
840 const int16_t* iter = runs;
841 for (; *iter; iter += *iter)
842 ;
843 int width = iter - runs;
844 SkASSERT(fClipRect.contains(SkIRect::MakeXYWH(x, y, width, 1)));
845 fBlitter->blitAntiH(x, y, aa, runs);
846}
847
848void SkRectClipCheckBlitter::blitV(int x, int y, int height, SkAlpha alpha) {
849 SkASSERT(fClipRect.contains(SkIRect::MakeXYWH(x, y, 1, height)));
850 fBlitter->blitV(x, y, height, alpha);
851}
852
853void SkRectClipCheckBlitter::blitRect(int x, int y, int width, int height) {
854 SkASSERT(fClipRect.contains(SkIRect::MakeXYWH(x, y, width, height)));
855 fBlitter->blitRect(x, y, width, height);
856}
857
858void SkRectClipCheckBlitter::blitAntiRect(int x, int y, int width, int height,
859 SkAlpha leftAlpha, SkAlpha rightAlpha) {
860 bool skipLeft = !leftAlpha;
861 bool skipRight = !rightAlpha;
862 SkIRect r = SkIRect::MakeXYWH(x + skipLeft, y, width + 2 - skipRight - skipLeft, height);
863 SkASSERT(r.isEmpty() || fClipRect.contains(r));
864 fBlitter->blitAntiRect(x, y, width, height, leftAlpha, rightAlpha);
865}
866
867void SkRectClipCheckBlitter::blitMask(const SkMask& mask, const SkIRect& clip) {
868 SkASSERT(mask.fBounds.contains(clip));
869 SkASSERT(fClipRect.contains(clip));
870 fBlitter->blitMask(mask, clip);
871}
872
873const SkPixmap* SkRectClipCheckBlitter::justAnOpaqueColor(uint32_t* value) {
874 return fBlitter->justAnOpaqueColor(value);
875}
876
877void SkRectClipCheckBlitter::blitAntiH2(int x, int y, U8CPU a0, U8CPU a1) {
878 SkASSERT(fClipRect.contains(SkIRect::MakeXYWH(x, y, 2, 1)));
879 fBlitter->blitAntiH2(x, y, a0, a1);
880}
881
882void SkRectClipCheckBlitter::blitAntiV2(int x, int y, U8CPU a0, U8CPU a1) {
883 SkASSERT(fClipRect.contains(SkIRect::MakeXYWH(x, y, 1, 2)));
884 fBlitter->blitAntiV2(x, y, a0, a1);
885}
886
887#endif
888