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 "SkCoreBlitters.h"
9 #include "SkColorData.h"
10 #include "SkShader.h"
11 #include "SkUtils.h"
12 #include "SkXfermodePriv.h"
13 #include "SkBlitMask.h"
14
15 ///////////////////////////////////////////////////////////////////////////////
16
SkARGB32_Blit32(const SkPixmap & device,const SkMask & mask,const SkIRect & clip,SkPMColor srcColor)17 static void SkARGB32_Blit32(const SkPixmap& device, const SkMask& mask,
18 const SkIRect& clip, SkPMColor srcColor) {
19 U8CPU alpha = SkGetPackedA32(srcColor);
20 unsigned flags = SkBlitRow::kSrcPixelAlpha_Flag32;
21 if (alpha != 255) {
22 flags |= SkBlitRow::kGlobalAlpha_Flag32;
23 }
24 SkBlitRow::Proc32 proc = SkBlitRow::Factory32(flags);
25
26 int x = clip.fLeft;
27 int y = clip.fTop;
28 int width = clip.width();
29 int height = clip.height();
30
31 SkPMColor* dstRow = device.writable_addr32(x, y);
32 const SkPMColor* srcRow = reinterpret_cast<const SkPMColor*>(mask.getAddr8(x, y));
33
34 do {
35 proc(dstRow, srcRow, width, alpha);
36 dstRow = (SkPMColor*)((char*)dstRow + device.rowBytes());
37 srcRow = (const SkPMColor*)((const char*)srcRow + mask.fRowBytes);
38 } while (--height != 0);
39 }
40
41 //////////////////////////////////////////////////////////////////////////////////////
42
SkARGB32_Blitter(const SkPixmap & device,const SkPaint & paint)43 SkARGB32_Blitter::SkARGB32_Blitter(const SkPixmap& device, const SkPaint& paint)
44 : INHERITED(device) {
45 SkColor color = paint.getColor();
46 fColor = color;
47
48 fSrcA = SkColorGetA(color);
49 unsigned scale = SkAlpha255To256(fSrcA);
50 fSrcR = SkAlphaMul(SkColorGetR(color), scale);
51 fSrcG = SkAlphaMul(SkColorGetG(color), scale);
52 fSrcB = SkAlphaMul(SkColorGetB(color), scale);
53
54 fPMColor = SkPackARGB32(fSrcA, fSrcR, fSrcG, fSrcB);
55 }
56
justAnOpaqueColor(uint32_t * value)57 const SkPixmap* SkARGB32_Blitter::justAnOpaqueColor(uint32_t* value) {
58 if (255 == fSrcA) {
59 *value = fPMColor;
60 return &fDevice;
61 }
62 return nullptr;
63 }
64
65 #if defined _WIN32 // disable warning : local variable used without having been initialized
66 #pragma warning ( push )
67 #pragma warning ( disable : 4701 )
68 #endif
69
blitH(int x,int y,int width)70 void SkARGB32_Blitter::blitH(int x, int y, int width) {
71 SkASSERT(x >= 0 && y >= 0 && x + width <= fDevice.width());
72
73 uint32_t* device = fDevice.writable_addr32(x, y);
74 SkBlitRow::Color32(device, device, width, fPMColor);
75 }
76
blitAntiH(int x,int y,const SkAlpha antialias[],const int16_t runs[])77 void SkARGB32_Blitter::blitAntiH(int x, int y, const SkAlpha antialias[],
78 const int16_t runs[]) {
79 if (fSrcA == 0) {
80 return;
81 }
82
83 uint32_t color = fPMColor;
84 uint32_t* device = fDevice.writable_addr32(x, y);
85 unsigned opaqueMask = fSrcA; // if fSrcA is 0xFF, then we will catch the fast opaque case
86
87 for (;;) {
88 int count = runs[0];
89 SkASSERT(count >= 0);
90 if (count <= 0) {
91 return;
92 }
93 unsigned aa = antialias[0];
94 if (aa) {
95 if ((opaqueMask & aa) == 255) {
96 sk_memset32(device, color, count);
97 } else {
98 uint32_t sc = SkAlphaMulQ(color, SkAlpha255To256(aa));
99 SkBlitRow::Color32(device, device, count, sc);
100 }
101 }
102 runs += count;
103 antialias += count;
104 device += count;
105 }
106 }
107
blitAntiH2(int x,int y,U8CPU a0,U8CPU a1)108 void SkARGB32_Blitter::blitAntiH2(int x, int y, U8CPU a0, U8CPU a1) {
109 uint32_t* device = fDevice.writable_addr32(x, y);
110 SkDEBUGCODE((void)fDevice.writable_addr32(x + 1, y);)
111
112 device[0] = SkBlendARGB32(fPMColor, device[0], a0);
113 device[1] = SkBlendARGB32(fPMColor, device[1], a1);
114 }
115
blitAntiV2(int x,int y,U8CPU a0,U8CPU a1)116 void SkARGB32_Blitter::blitAntiV2(int x, int y, U8CPU a0, U8CPU a1) {
117 uint32_t* device = fDevice.writable_addr32(x, y);
118 SkDEBUGCODE((void)fDevice.writable_addr32(x, y + 1);)
119
120 device[0] = SkBlendARGB32(fPMColor, device[0], a0);
121 device = (uint32_t*)((char*)device + fDevice.rowBytes());
122 device[0] = SkBlendARGB32(fPMColor, device[0], a1);
123 }
124
125 //////////////////////////////////////////////////////////////////////////////////////
126
127 #define solid_8_pixels(mask, dst, color) \
128 do { \
129 if (mask & 0x80) dst[0] = color; \
130 if (mask & 0x40) dst[1] = color; \
131 if (mask & 0x20) dst[2] = color; \
132 if (mask & 0x10) dst[3] = color; \
133 if (mask & 0x08) dst[4] = color; \
134 if (mask & 0x04) dst[5] = color; \
135 if (mask & 0x02) dst[6] = color; \
136 if (mask & 0x01) dst[7] = color; \
137 } while (0)
138
139 #define SK_BLITBWMASK_NAME SkARGB32_BlitBW
140 #define SK_BLITBWMASK_ARGS , SkPMColor color
141 #define SK_BLITBWMASK_BLIT8(mask, dst) solid_8_pixels(mask, dst, color)
142 #define SK_BLITBWMASK_GETADDR writable_addr32
143 #define SK_BLITBWMASK_DEVTYPE uint32_t
144 #include "SkBlitBWMaskTemplate.h"
145
146 #define blend_8_pixels(mask, dst, sc, dst_scale) \
147 do { \
148 if (mask & 0x80) { dst[0] = sc + SkAlphaMulQ(dst[0], dst_scale); } \
149 if (mask & 0x40) { dst[1] = sc + SkAlphaMulQ(dst[1], dst_scale); } \
150 if (mask & 0x20) { dst[2] = sc + SkAlphaMulQ(dst[2], dst_scale); } \
151 if (mask & 0x10) { dst[3] = sc + SkAlphaMulQ(dst[3], dst_scale); } \
152 if (mask & 0x08) { dst[4] = sc + SkAlphaMulQ(dst[4], dst_scale); } \
153 if (mask & 0x04) { dst[5] = sc + SkAlphaMulQ(dst[5], dst_scale); } \
154 if (mask & 0x02) { dst[6] = sc + SkAlphaMulQ(dst[6], dst_scale); } \
155 if (mask & 0x01) { dst[7] = sc + SkAlphaMulQ(dst[7], dst_scale); } \
156 } while (0)
157
158 #define SK_BLITBWMASK_NAME SkARGB32_BlendBW
159 #define SK_BLITBWMASK_ARGS , uint32_t sc, unsigned dst_scale
160 #define SK_BLITBWMASK_BLIT8(mask, dst) blend_8_pixels(mask, dst, sc, dst_scale)
161 #define SK_BLITBWMASK_GETADDR writable_addr32
162 #define SK_BLITBWMASK_DEVTYPE uint32_t
163 #include "SkBlitBWMaskTemplate.h"
164
blitMask(const SkMask & mask,const SkIRect & clip)165 void SkARGB32_Blitter::blitMask(const SkMask& mask, const SkIRect& clip) {
166 SkASSERT(mask.fBounds.contains(clip));
167 SkASSERT(fSrcA != 0xFF);
168
169 if (fSrcA == 0) {
170 return;
171 }
172
173 if (SkBlitMask::BlitColor(fDevice, mask, clip, fColor)) {
174 return;
175 }
176
177 switch (mask.fFormat) {
178 case SkMask::kBW_Format:
179 SkARGB32_BlendBW(fDevice, mask, clip, fPMColor, SkAlpha255To256(255 - fSrcA));
180 break;
181 case SkMask::kARGB32_Format:
182 SkARGB32_Blit32(fDevice, mask, clip, fPMColor);
183 break;
184 default:
185 SK_ABORT("Mask format not handled.");
186 }
187 }
188
blitMask(const SkMask & mask,const SkIRect & clip)189 void SkARGB32_Opaque_Blitter::blitMask(const SkMask& mask,
190 const SkIRect& clip) {
191 SkASSERT(mask.fBounds.contains(clip));
192
193 if (SkBlitMask::BlitColor(fDevice, mask, clip, fColor)) {
194 return;
195 }
196
197 switch (mask.fFormat) {
198 case SkMask::kBW_Format:
199 SkARGB32_BlitBW(fDevice, mask, clip, fPMColor);
200 break;
201 case SkMask::kARGB32_Format:
202 SkARGB32_Blit32(fDevice, mask, clip, fPMColor);
203 break;
204 default:
205 SK_ABORT("Mask format not handled.");
206 }
207 }
208
blitAntiH2(int x,int y,U8CPU a0,U8CPU a1)209 void SkARGB32_Opaque_Blitter::blitAntiH2(int x, int y, U8CPU a0, U8CPU a1) {
210 uint32_t* device = fDevice.writable_addr32(x, y);
211 SkDEBUGCODE((void)fDevice.writable_addr32(x + 1, y);)
212
213 device[0] = SkFastFourByteInterp(fPMColor, device[0], a0);
214 device[1] = SkFastFourByteInterp(fPMColor, device[1], a1);
215 }
216
blitAntiV2(int x,int y,U8CPU a0,U8CPU a1)217 void SkARGB32_Opaque_Blitter::blitAntiV2(int x, int y, U8CPU a0, U8CPU a1) {
218 uint32_t* device = fDevice.writable_addr32(x, y);
219 SkDEBUGCODE((void)fDevice.writable_addr32(x, y + 1);)
220
221 device[0] = SkFastFourByteInterp(fPMColor, device[0], a0);
222 device = (uint32_t*)((char*)device + fDevice.rowBytes());
223 device[0] = SkFastFourByteInterp(fPMColor, device[0], a1);
224 }
225
226 ///////////////////////////////////////////////////////////////////////////////
227
blitV(int x,int y,int height,SkAlpha alpha)228 void SkARGB32_Blitter::blitV(int x, int y, int height, SkAlpha alpha) {
229 if (alpha == 0 || fSrcA == 0) {
230 return;
231 }
232
233 uint32_t* device = fDevice.writable_addr32(x, y);
234 uint32_t color = fPMColor;
235
236 if (alpha != 255) {
237 color = SkAlphaMulQ(color, SkAlpha255To256(alpha));
238 }
239
240 unsigned dst_scale = SkAlpha255To256(255 - SkGetPackedA32(color));
241 size_t rowBytes = fDevice.rowBytes();
242 while (--height >= 0) {
243 device[0] = color + SkAlphaMulQ(device[0], dst_scale);
244 device = (uint32_t*)((char*)device + rowBytes);
245 }
246 }
247
blitRect(int x,int y,int width,int height)248 void SkARGB32_Blitter::blitRect(int x, int y, int width, int height) {
249 SkASSERT(x >= 0 && y >= 0 && x + width <= fDevice.width() && y + height <= fDevice.height());
250
251 if (fSrcA == 0) {
252 return;
253 }
254
255 uint32_t* device = fDevice.writable_addr32(x, y);
256 uint32_t color = fPMColor;
257 size_t rowBytes = fDevice.rowBytes();
258
259 while (--height >= 0) {
260 SkBlitRow::Color32(device, device, width, color);
261 device = (uint32_t*)((char*)device + rowBytes);
262 }
263 }
264
265 #if defined _WIN32
266 #pragma warning ( pop )
267 #endif
268
269 ///////////////////////////////////////////////////////////////////////
270
blitAntiH(int x,int y,const SkAlpha antialias[],const int16_t runs[])271 void SkARGB32_Black_Blitter::blitAntiH(int x, int y, const SkAlpha antialias[],
272 const int16_t runs[]) {
273 uint32_t* device = fDevice.writable_addr32(x, y);
274 SkPMColor black = (SkPMColor)(SK_A32_MASK << SK_A32_SHIFT);
275
276 for (;;) {
277 int count = runs[0];
278 SkASSERT(count >= 0);
279 if (count <= 0) {
280 return;
281 }
282 unsigned aa = antialias[0];
283 if (aa) {
284 if (aa == 255) {
285 sk_memset32(device, black, count);
286 } else {
287 SkPMColor src = aa << SK_A32_SHIFT;
288 unsigned dst_scale = 256 - aa;
289 int n = count;
290 do {
291 --n;
292 device[n] = src + SkAlphaMulQ(device[n], dst_scale);
293 } while (n > 0);
294 }
295 }
296 runs += count;
297 antialias += count;
298 device += count;
299 }
300 }
301
blitAntiH2(int x,int y,U8CPU a0,U8CPU a1)302 void SkARGB32_Black_Blitter::blitAntiH2(int x, int y, U8CPU a0, U8CPU a1) {
303 uint32_t* device = fDevice.writable_addr32(x, y);
304 SkDEBUGCODE((void)fDevice.writable_addr32(x + 1, y);)
305
306 device[0] = (a0 << SK_A32_SHIFT) + SkAlphaMulQ(device[0], 256 - a0);
307 device[1] = (a1 << SK_A32_SHIFT) + SkAlphaMulQ(device[1], 256 - a1);
308 }
309
blitAntiV2(int x,int y,U8CPU a0,U8CPU a1)310 void SkARGB32_Black_Blitter::blitAntiV2(int x, int y, U8CPU a0, U8CPU a1) {
311 uint32_t* device = fDevice.writable_addr32(x, y);
312 SkDEBUGCODE((void)fDevice.writable_addr32(x, y + 1);)
313
314 device[0] = (a0 << SK_A32_SHIFT) + SkAlphaMulQ(device[0], 256 - a0);
315 device = (uint32_t*)((char*)device + fDevice.rowBytes());
316 device[0] = (a1 << SK_A32_SHIFT) + SkAlphaMulQ(device[0], 256 - a1);
317 }
318
319 ///////////////////////////////////////////////////////////////////////////////
320
321 // Special version of SkBlitRow::Factory32 that knows we're in kSrc_Mode,
322 // instead of kSrcOver_Mode
blend_srcmode(SkPMColor * SK_RESTRICT device,const SkPMColor * SK_RESTRICT span,int count,U8CPU aa)323 static void blend_srcmode(SkPMColor* SK_RESTRICT device,
324 const SkPMColor* SK_RESTRICT span,
325 int count, U8CPU aa) {
326 int aa256 = SkAlpha255To256(aa);
327 for (int i = 0; i < count; ++i) {
328 device[i] = SkFourByteInterp256(span[i], device[i], aa256);
329 }
330 }
331
SkARGB32_Shader_Blitter(const SkPixmap & device,const SkPaint & paint,SkShaderBase::Context * shaderContext)332 SkARGB32_Shader_Blitter::SkARGB32_Shader_Blitter(const SkPixmap& device,
333 const SkPaint& paint, SkShaderBase::Context* shaderContext)
334 : INHERITED(device, paint, shaderContext)
335 {
336 fBuffer = (SkPMColor*)sk_malloc_throw(device.width() * (sizeof(SkPMColor)));
337
338 fXfermode = SkXfermode::Peek(paint.getBlendMode());
339
340 int flags = 0;
341 if (!(shaderContext->getFlags() & SkShaderBase::kOpaqueAlpha_Flag)) {
342 flags |= SkBlitRow::kSrcPixelAlpha_Flag32;
343 }
344 // we call this on the output from the shader
345 fProc32 = SkBlitRow::Factory32(flags);
346 // we call this on the output from the shader + alpha from the aa buffer
347 fProc32Blend = SkBlitRow::Factory32(flags | SkBlitRow::kGlobalAlpha_Flag32);
348
349 fShadeDirectlyIntoDevice = false;
350 if (fXfermode == nullptr) {
351 if (shaderContext->getFlags() & SkShaderBase::kOpaqueAlpha_Flag) {
352 fShadeDirectlyIntoDevice = true;
353 }
354 } else {
355 if (SkBlendMode::kSrc == paint.getBlendMode()) {
356 fShadeDirectlyIntoDevice = true;
357 fProc32Blend = blend_srcmode;
358 }
359 }
360
361 fConstInY = SkToBool(shaderContext->getFlags() & SkShaderBase::kConstInY32_Flag);
362 }
363
~SkARGB32_Shader_Blitter()364 SkARGB32_Shader_Blitter::~SkARGB32_Shader_Blitter() {
365 sk_free(fBuffer);
366 }
367
blitH(int x,int y,int width)368 void SkARGB32_Shader_Blitter::blitH(int x, int y, int width) {
369 SkASSERT(x >= 0 && y >= 0 && x + width <= fDevice.width());
370
371 uint32_t* device = fDevice.writable_addr32(x, y);
372
373 if (fShadeDirectlyIntoDevice) {
374 fShaderContext->shadeSpan(x, y, device, width);
375 } else {
376 SkPMColor* span = fBuffer;
377 fShaderContext->shadeSpan(x, y, span, width);
378 if (fXfermode) {
379 fXfermode->xfer32(device, span, width, nullptr);
380 } else {
381 fProc32(device, span, width, 255);
382 }
383 }
384 }
385
blitRect(int x,int y,int width,int height)386 void SkARGB32_Shader_Blitter::blitRect(int x, int y, int width, int height) {
387 SkASSERT(x >= 0 && y >= 0 &&
388 x + width <= fDevice.width() && y + height <= fDevice.height());
389
390 uint32_t* device = fDevice.writable_addr32(x, y);
391 size_t deviceRB = fDevice.rowBytes();
392 auto* shaderContext = fShaderContext;
393 SkPMColor* span = fBuffer;
394
395 if (fConstInY) {
396 if (fShadeDirectlyIntoDevice) {
397 // shade the first row directly into the device
398 shaderContext->shadeSpan(x, y, device, width);
399 span = device;
400 while (--height > 0) {
401 device = (uint32_t*)((char*)device + deviceRB);
402 memcpy(device, span, width << 2);
403 }
404 } else {
405 shaderContext->shadeSpan(x, y, span, width);
406 SkXfermode* xfer = fXfermode;
407 if (xfer) {
408 do {
409 xfer->xfer32(device, span, width, nullptr);
410 y += 1;
411 device = (uint32_t*)((char*)device + deviceRB);
412 } while (--height > 0);
413 } else {
414 SkBlitRow::Proc32 proc = fProc32;
415 do {
416 proc(device, span, width, 255);
417 y += 1;
418 device = (uint32_t*)((char*)device + deviceRB);
419 } while (--height > 0);
420 }
421 }
422 return;
423 }
424
425 if (fShadeDirectlyIntoDevice) {
426 do {
427 shaderContext->shadeSpan(x, y, device, width);
428 y += 1;
429 device = (uint32_t*)((char*)device + deviceRB);
430 } while (--height > 0);
431 } else {
432 SkXfermode* xfer = fXfermode;
433 if (xfer) {
434 do {
435 shaderContext->shadeSpan(x, y, span, width);
436 xfer->xfer32(device, span, width, nullptr);
437 y += 1;
438 device = (uint32_t*)((char*)device + deviceRB);
439 } while (--height > 0);
440 } else {
441 SkBlitRow::Proc32 proc = fProc32;
442 do {
443 shaderContext->shadeSpan(x, y, span, width);
444 proc(device, span, width, 255);
445 y += 1;
446 device = (uint32_t*)((char*)device + deviceRB);
447 } while (--height > 0);
448 }
449 }
450 }
451
blitAntiH(int x,int y,const SkAlpha antialias[],const int16_t runs[])452 void SkARGB32_Shader_Blitter::blitAntiH(int x, int y, const SkAlpha antialias[],
453 const int16_t runs[]) {
454 SkPMColor* span = fBuffer;
455 uint32_t* device = fDevice.writable_addr32(x, y);
456 auto* shaderContext = fShaderContext;
457
458 if (fXfermode && !fShadeDirectlyIntoDevice) {
459 for (;;) {
460 SkXfermode* xfer = fXfermode;
461
462 int count = *runs;
463 if (count <= 0)
464 break;
465 int aa = *antialias;
466 if (aa) {
467 shaderContext->shadeSpan(x, y, span, count);
468 if (aa == 255) {
469 xfer->xfer32(device, span, count, nullptr);
470 } else {
471 // count is almost always 1
472 for (int i = count - 1; i >= 0; --i) {
473 xfer->xfer32(&device[i], &span[i], 1, antialias);
474 }
475 }
476 }
477 device += count;
478 runs += count;
479 antialias += count;
480 x += count;
481 }
482 } else if (fShadeDirectlyIntoDevice ||
483 (shaderContext->getFlags() & SkShaderBase::kOpaqueAlpha_Flag)) {
484 for (;;) {
485 int count = *runs;
486 if (count <= 0) {
487 break;
488 }
489 int aa = *antialias;
490 if (aa) {
491 if (aa == 255) {
492 // cool, have the shader draw right into the device
493 shaderContext->shadeSpan(x, y, device, count);
494 } else {
495 shaderContext->shadeSpan(x, y, span, count);
496 fProc32Blend(device, span, count, aa);
497 }
498 }
499 device += count;
500 runs += count;
501 antialias += count;
502 x += count;
503 }
504 } else {
505 for (;;) {
506 int count = *runs;
507 if (count <= 0) {
508 break;
509 }
510 int aa = *antialias;
511 if (aa) {
512 shaderContext->shadeSpan(x, y, span, count);
513 if (aa == 255) {
514 fProc32(device, span, count, 255);
515 } else {
516 fProc32Blend(device, span, count, aa);
517 }
518 }
519 device += count;
520 runs += count;
521 antialias += count;
522 x += count;
523 }
524 }
525 }
526
blitMask(const SkMask & mask,const SkIRect & clip)527 void SkARGB32_Shader_Blitter::blitMask(const SkMask& mask, const SkIRect& clip) {
528 // we only handle kA8 with an xfermode
529 if (fXfermode && (SkMask::kA8_Format != mask.fFormat)) {
530 this->INHERITED::blitMask(mask, clip);
531 return;
532 }
533
534 SkASSERT(mask.fBounds.contains(clip));
535
536 auto* shaderContext = fShaderContext;
537 SkBlitMask::RowProc proc = nullptr;
538 if (!fXfermode) {
539 unsigned flags = 0;
540 if (shaderContext->getFlags() & SkShaderBase::kOpaqueAlpha_Flag) {
541 flags |= SkBlitMask::kSrcIsOpaque_RowFlag;
542 }
543 proc = SkBlitMask::RowFactory(kN32_SkColorType, mask.fFormat,
544 (SkBlitMask::RowFlags)flags);
545 if (nullptr == proc) {
546 this->INHERITED::blitMask(mask, clip);
547 return;
548 }
549 }
550
551 const int x = clip.fLeft;
552 const int width = clip.width();
553 int y = clip.fTop;
554 int height = clip.height();
555
556 char* dstRow = (char*)fDevice.writable_addr32(x, y);
557 const size_t dstRB = fDevice.rowBytes();
558 const uint8_t* maskRow = (const uint8_t*)mask.getAddr(x, y);
559 const size_t maskRB = mask.fRowBytes;
560
561 SkPMColor* span = fBuffer;
562
563 if (fXfermode) {
564 SkASSERT(SkMask::kA8_Format == mask.fFormat);
565 SkXfermode* xfer = fXfermode;
566 do {
567 shaderContext->shadeSpan(x, y, span, width);
568 xfer->xfer32(reinterpret_cast<SkPMColor*>(dstRow), span, width, maskRow);
569 dstRow += dstRB;
570 maskRow += maskRB;
571 y += 1;
572 } while (--height > 0);
573 } else {
574 do {
575 shaderContext->shadeSpan(x, y, span, width);
576 proc(reinterpret_cast<SkPMColor*>(dstRow), maskRow, span, width);
577 dstRow += dstRB;
578 maskRow += maskRB;
579 y += 1;
580 } while (--height > 0);
581 }
582 }
583
blitV(int x,int y,int height,SkAlpha alpha)584 void SkARGB32_Shader_Blitter::blitV(int x, int y, int height, SkAlpha alpha) {
585 SkASSERT(x >= 0 && y >= 0 && y + height <= fDevice.height());
586
587 uint32_t* device = fDevice.writable_addr32(x, y);
588 size_t deviceRB = fDevice.rowBytes();
589 auto* shaderContext = fShaderContext;
590
591 if (fConstInY) {
592 SkPMColor c;
593 shaderContext->shadeSpan(x, y, &c, 1);
594
595 if (fShadeDirectlyIntoDevice) {
596 if (255 == alpha) {
597 do {
598 *device = c;
599 device = (uint32_t*)((char*)device + deviceRB);
600 } while (--height > 0);
601 } else {
602 do {
603 *device = SkFourByteInterp(c, *device, alpha);
604 device = (uint32_t*)((char*)device + deviceRB);
605 } while (--height > 0);
606 }
607 } else {
608 SkXfermode* xfer = fXfermode;
609 if (xfer) {
610 do {
611 xfer->xfer32(device, &c, 1, &alpha);
612 device = (uint32_t*)((char*)device + deviceRB);
613 } while (--height > 0);
614 } else {
615 SkBlitRow::Proc32 proc = (255 == alpha) ? fProc32 : fProc32Blend;
616 do {
617 proc(device, &c, 1, alpha);
618 device = (uint32_t*)((char*)device + deviceRB);
619 } while (--height > 0);
620 }
621 }
622 return;
623 }
624
625 if (fShadeDirectlyIntoDevice) {
626 if (255 == alpha) {
627 do {
628 shaderContext->shadeSpan(x, y, device, 1);
629 y += 1;
630 device = (uint32_t*)((char*)device + deviceRB);
631 } while (--height > 0);
632 } else {
633 do {
634 SkPMColor c;
635 shaderContext->shadeSpan(x, y, &c, 1);
636 *device = SkFourByteInterp(c, *device, alpha);
637 y += 1;
638 device = (uint32_t*)((char*)device + deviceRB);
639 } while (--height > 0);
640 }
641 } else {
642 SkPMColor* span = fBuffer;
643 SkXfermode* xfer = fXfermode;
644 if (xfer) {
645 do {
646 shaderContext->shadeSpan(x, y, span, 1);
647 xfer->xfer32(device, span, 1, &alpha);
648 y += 1;
649 device = (uint32_t*)((char*)device + deviceRB);
650 } while (--height > 0);
651 } else {
652 SkBlitRow::Proc32 proc = (255 == alpha) ? fProc32 : fProc32Blend;
653 do {
654 shaderContext->shadeSpan(x, y, span, 1);
655 proc(device, span, 1, alpha);
656 y += 1;
657 device = (uint32_t*)((char*)device + deviceRB);
658 } while (--height > 0);
659 }
660 }
661 }
662