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1 | |
2 /* | |
3 * Copyright 2006 The Android Open Source Project | |
4 * | |
5 * Use of this source code is governed by a BSD-style license that can be | |
6 * found in the LICENSE file. | |
7 */ | |
8 | |
9 | |
10 #include "SkCoreBlitters.h" | |
11 #include "SkColorPriv.h" | |
12 #include "SkDither.h" | |
13 #include "SkShader.h" | |
14 #include "SkTemplatesPriv.h" | |
15 #include "SkUtils.h" | |
16 #include "SkXfermode.h" | |
17 | |
18 static inline SkPMColor SkBlendARGB4444(SkPMColor16 src, SkPMColor16 dst, | |
19 U8CPU aa) { | |
20 SkASSERT((unsigned)aa <= 255); | |
21 | |
22 unsigned src_scale = SkAlpha255To256(aa) >> 4; | |
23 unsigned dst_scale = SkAlpha15To16(15 - SkAlphaMul4(SkGetPackedA4444(src), s
rc_scale)); | |
24 | |
25 uint32_t src32 = SkExpand_4444(src) * src_scale; | |
26 uint32_t dst32 = SkExpand_4444(dst) * dst_scale; | |
27 return SkCompact_4444((src32 + dst32) >> 4); | |
28 } | |
29 | |
30 /////////////////////////////////////////////////////////////////////////////// | |
31 | |
32 class SkARGB4444_Blitter : public SkRasterBlitter { | |
33 public: | |
34 SkARGB4444_Blitter(const SkBitmap& device, const SkPaint& paint); | |
35 virtual void blitH(int x, int y, int width); | |
36 virtual void blitAntiH(int x, int y, const SkAlpha antialias[], | |
37 const int16_t runs[]); | |
38 virtual void blitV(int x, int y, int height, SkAlpha alpha); | |
39 virtual void blitRect(int x, int y, int width, int height); | |
40 virtual void blitMask(const SkMask&, const SkIRect&); | |
41 virtual const SkBitmap* justAnOpaqueColor(uint32_t*); | |
42 | |
43 protected: | |
44 SkPMColor16 fPMColor16, fPMColor16Other; | |
45 SkPMColor16 fRawColor16, fRawColor16Other; | |
46 uint8_t fScale16; | |
47 | |
48 private: | |
49 // illegal | |
50 SkARGB4444_Blitter& operator=(const SkARGB4444_Blitter&); | |
51 | |
52 typedef SkRasterBlitter INHERITED; | |
53 }; | |
54 | |
55 | |
56 SkARGB4444_Blitter::SkARGB4444_Blitter(const SkBitmap& device, | |
57 const SkPaint& paint) : INHERITED(device) { | |
58 // cache premultiplied versions in 4444 | |
59 SkPMColor c = SkPreMultiplyColor(paint.getColor()); | |
60 fPMColor16 = SkPixel32ToPixel4444(c); | |
61 if (paint.isDither()) { | |
62 fPMColor16Other = SkDitherPixel32To4444(c); | |
63 } else { | |
64 fPMColor16Other = fPMColor16; | |
65 } | |
66 | |
67 // cache raw versions in 4444 | |
68 fRawColor16 = SkPackARGB4444(0xFF >> 4, SkColorGetR(c) >> 4, | |
69 SkColorGetG(c) >> 4, SkColorGetB(c) >> 4); | |
70 if (paint.isDither()) { | |
71 fRawColor16Other = SkDitherARGB32To4444(0xFF, SkColorGetR(c), | |
72 SkColorGetG(c), SkColorGetB(c)); | |
73 } else { | |
74 fRawColor16Other = fRawColor16; | |
75 } | |
76 | |
77 fScale16 = SkAlpha15To16(SkGetPackedA4444(fPMColor16Other)); | |
78 if (16 == fScale16) { | |
79 // force the original to also be opaque | |
80 fPMColor16 |= (0xF << SK_A4444_SHIFT); | |
81 } | |
82 } | |
83 | |
84 const SkBitmap* SkARGB4444_Blitter::justAnOpaqueColor(uint32_t* value) { | |
85 if (16 == fScale16) { | |
86 *value = fPMColor16; | |
87 return &fDevice; | |
88 } | |
89 return NULL; | |
90 } | |
91 | |
92 static void src_over_4444(SkPMColor16 dst[], SkPMColor16 color, | |
93 SkPMColor16 other, unsigned invScale, int count) { | |
94 int twice = count >> 1; | |
95 while (--twice >= 0) { | |
96 *dst = color + SkAlphaMulQ4(*dst, invScale); | |
97 dst++; | |
98 *dst = other + SkAlphaMulQ4(*dst, invScale); | |
99 dst++; | |
100 } | |
101 if (count & 1) { | |
102 *dst = color + SkAlphaMulQ4(*dst, invScale); | |
103 } | |
104 } | |
105 | |
106 static inline uint32_t SkExpand_4444_Replicate(SkPMColor16 c) { | |
107 uint32_t c32 = SkExpand_4444(c); | |
108 return c32 | (c32 << 4); | |
109 } | |
110 | |
111 static void src_over_4444x(SkPMColor16 dst[], uint32_t color, | |
112 uint32_t other, unsigned invScale, int count) { | |
113 int twice = count >> 1; | |
114 uint32_t tmp; | |
115 while (--twice >= 0) { | |
116 tmp = SkExpand_4444(*dst) * invScale; | |
117 *dst++ = SkCompact_4444((color + tmp) >> 4); | |
118 tmp = SkExpand_4444(*dst) * invScale; | |
119 *dst++ = SkCompact_4444((other + tmp) >> 4); | |
120 } | |
121 if (count & 1) { | |
122 tmp = SkExpand_4444(*dst) * invScale; | |
123 *dst = SkCompact_4444((color + tmp) >> 4); | |
124 } | |
125 } | |
126 | |
127 void SkARGB4444_Blitter::blitH(int x, int y, int width) { | |
128 SkASSERT(x >= 0 && y >= 0 && x + width <= fDevice.width()); | |
129 | |
130 if (0 == fScale16) { | |
131 return; | |
132 } | |
133 | |
134 SkPMColor16* device = fDevice.getAddr16(x, y); | |
135 SkPMColor16 color = fPMColor16; | |
136 SkPMColor16 other = fPMColor16Other; | |
137 | |
138 if ((x ^ y) & 1) { | |
139 SkTSwap<SkPMColor16>(color, other); | |
140 } | |
141 | |
142 if (16 == fScale16) { | |
143 sk_dither_memset16(device, color, other, width); | |
144 } else { | |
145 src_over_4444x(device, SkExpand_4444_Replicate(color), | |
146 SkExpand_4444_Replicate(other), | |
147 16 - fScale16, width); | |
148 } | |
149 } | |
150 | |
151 void SkARGB4444_Blitter::blitV(int x, int y, int height, SkAlpha alpha) { | |
152 if (0 == alpha || 0 == fScale16) { | |
153 return; | |
154 } | |
155 | |
156 SkPMColor16* device = fDevice.getAddr16(x, y); | |
157 SkPMColor16 color = fPMColor16; | |
158 SkPMColor16 other = fPMColor16Other; | |
159 size_t rb = fDevice.rowBytes(); | |
160 | |
161 if ((x ^ y) & 1) { | |
162 SkTSwap<SkPMColor16>(color, other); | |
163 } | |
164 | |
165 if (16 == fScale16 && 255 == alpha) { | |
166 while (--height >= 0) { | |
167 *device = color; | |
168 device = (SkPMColor16*)((char*)device + rb); | |
169 SkTSwap<SkPMColor16>(color, other); | |
170 } | |
171 } else { | |
172 unsigned alphaScale = SkAlpha255To256(alpha); | |
173 uint32_t c32 = SkExpand_4444(color) * (alphaScale >> 4); | |
174 // need to normalize the low nibble of each expanded component | |
175 // so we don't overflow the add with d32 | |
176 c32 = SkCompact_4444(c32 >> 4); | |
177 unsigned invScale = 16 - SkAlpha15To16(SkGetPackedA4444(c32)); | |
178 // now re-expand and replicate | |
179 c32 = SkExpand_4444_Replicate(c32); | |
180 | |
181 while (--height >= 0) { | |
182 uint32_t d32 = SkExpand_4444(*device) * invScale; | |
183 *device = SkCompact_4444((c32 + d32) >> 4); | |
184 device = (SkPMColor16*)((char*)device + rb); | |
185 } | |
186 } | |
187 } | |
188 | |
189 void SkARGB4444_Blitter::blitRect(int x, int y, int width, int height) { | |
190 SkASSERT(x >= 0 && y >= 0 && x + width <= fDevice.width() && | |
191 y + height <= fDevice.height()); | |
192 | |
193 if (0 == fScale16) { | |
194 return; | |
195 } | |
196 | |
197 SkPMColor16* device = fDevice.getAddr16(x, y); | |
198 SkPMColor16 color = fPMColor16; | |
199 SkPMColor16 other = fPMColor16Other; | |
200 | |
201 if ((x ^ y) & 1) { | |
202 SkTSwap<SkPMColor16>(color, other); | |
203 } | |
204 | |
205 if (16 == fScale16) { | |
206 while (--height >= 0) { | |
207 sk_dither_memset16(device, color, other, width); | |
208 device = (SkPMColor16*)((char*)device + fDevice.rowBytes()); | |
209 SkTSwap<SkPMColor16>(color, other); | |
210 } | |
211 } else { | |
212 unsigned invScale = 16 - fScale16; | |
213 | |
214 uint32_t c32 = SkExpand_4444_Replicate(color); | |
215 uint32_t o32 = SkExpand_4444_Replicate(other); | |
216 while (--height >= 0) { | |
217 src_over_4444x(device, c32, o32, invScale, width); | |
218 device = (SkPMColor16*)((char*)device + fDevice.rowBytes()); | |
219 SkTSwap<uint32_t>(c32, o32); | |
220 } | |
221 } | |
222 } | |
223 | |
224 void SkARGB4444_Blitter::blitAntiH(int x, int y, const SkAlpha antialias[], | |
225 const int16_t runs[]) { | |
226 if (0 == fScale16) { | |
227 return; | |
228 } | |
229 | |
230 SkPMColor16* device = fDevice.getAddr16(x, y); | |
231 SkPMColor16 color = fPMColor16; | |
232 SkPMColor16 other = fPMColor16Other; | |
233 | |
234 if ((x ^ y) & 1) { | |
235 SkTSwap<SkPMColor16>(color, other); | |
236 } | |
237 | |
238 for (;;) { | |
239 int count = runs[0]; | |
240 SkASSERT(count >= 0); | |
241 if (count <= 0) { | |
242 return; | |
243 } | |
244 | |
245 unsigned aa = antialias[0]; | |
246 if (aa) { | |
247 if (0xFF == aa) { | |
248 if (16 == fScale16) { | |
249 sk_dither_memset16(device, color, other, count); | |
250 } else { | |
251 src_over_4444(device, color, other, 16 - fScale16, count); | |
252 } | |
253 } else { | |
254 // todo: respect dithering | |
255 aa = SkAlpha255To256(aa); // FIX | |
256 SkPMColor16 src = SkAlphaMulQ4(color, aa >> 4); | |
257 unsigned dst_scale = SkAlpha15To16(15 - SkGetPackedA4444(src));
// FIX | |
258 int n = count; | |
259 do { | |
260 --n; | |
261 device[n] = src + SkAlphaMulQ4(device[n], dst_scale); | |
262 } while (n > 0); | |
263 } | |
264 } | |
265 | |
266 runs += count; | |
267 antialias += count; | |
268 device += count; | |
269 | |
270 if (count & 1) { | |
271 SkTSwap<SkPMColor16>(color, other); | |
272 } | |
273 } | |
274 } | |
275 | |
276 /////////////////////////////////////////////////////////////////////////////// | |
277 | |
278 #define solid_8_pixels(mask, dst, color) \ | |
279 do { \ | |
280 if (mask & 0x80) dst[0] = color; \ | |
281 if (mask & 0x40) dst[1] = color; \ | |
282 if (mask & 0x20) dst[2] = color; \ | |
283 if (mask & 0x10) dst[3] = color; \ | |
284 if (mask & 0x08) dst[4] = color; \ | |
285 if (mask & 0x04) dst[5] = color; \ | |
286 if (mask & 0x02) dst[6] = color; \ | |
287 if (mask & 0x01) dst[7] = color; \ | |
288 } while (0) | |
289 | |
290 #define SK_BLITBWMASK_NAME SkARGB4444_BlitBW | |
291 #define SK_BLITBWMASK_ARGS , SkPMColor16 color | |
292 #define SK_BLITBWMASK_BLIT8(mask, dst) solid_8_pixels(mask, dst, color) | |
293 #define SK_BLITBWMASK_GETADDR getAddr16 | |
294 #define SK_BLITBWMASK_DEVTYPE uint16_t | |
295 #include "SkBlitBWMaskTemplate.h" | |
296 | |
297 #define blend_8_pixels(mask, dst, sc, dst_scale) \ | |
298 do { \ | |
299 if (mask & 0x80) { dst[0] = sc + SkAlphaMulQ4(dst[0], dst_scale); } \ | |
300 if (mask & 0x40) { dst[1] = sc + SkAlphaMulQ4(dst[1], dst_scale); } \ | |
301 if (mask & 0x20) { dst[2] = sc + SkAlphaMulQ4(dst[2], dst_scale); } \ | |
302 if (mask & 0x10) { dst[3] = sc + SkAlphaMulQ4(dst[3], dst_scale); } \ | |
303 if (mask & 0x08) { dst[4] = sc + SkAlphaMulQ4(dst[4], dst_scale); } \ | |
304 if (mask & 0x04) { dst[5] = sc + SkAlphaMulQ4(dst[5], dst_scale); } \ | |
305 if (mask & 0x02) { dst[6] = sc + SkAlphaMulQ4(dst[6], dst_scale); } \ | |
306 if (mask & 0x01) { dst[7] = sc + SkAlphaMulQ4(dst[7], dst_scale); } \ | |
307 } while (0) | |
308 | |
309 #define SK_BLITBWMASK_NAME SkARGB4444_BlendBW | |
310 #define SK_BLITBWMASK_ARGS , uint16_t sc, unsigned dst_scale | |
311 #define SK_BLITBWMASK_BLIT8(mask, dst) blend_8_pixels(mask, dst, sc, dst_sc
ale) | |
312 #define SK_BLITBWMASK_GETADDR getAddr16 | |
313 #define SK_BLITBWMASK_DEVTYPE uint16_t | |
314 #include "SkBlitBWMaskTemplate.h" | |
315 | |
316 void SkARGB4444_Blitter::blitMask(const SkMask& mask, const SkIRect& clip) { | |
317 SkASSERT(mask.fBounds.contains(clip)); | |
318 | |
319 if (0 == fScale16) { | |
320 return; | |
321 } | |
322 | |
323 if (mask.fFormat == SkMask::kBW_Format) { | |
324 if (16 == fScale16) { | |
325 SkARGB4444_BlitBW(fDevice, mask, clip, fPMColor16); | |
326 } else { | |
327 SkARGB4444_BlendBW(fDevice, mask, clip, fPMColor16, 16 - fScale16); | |
328 } | |
329 return; | |
330 } | |
331 | |
332 int x = clip.fLeft; | |
333 int y = clip.fTop; | |
334 int width = clip.width(); | |
335 int height = clip.height(); | |
336 | |
337 SkPMColor16* device = fDevice.getAddr16(x, y); | |
338 const uint8_t* alpha = mask.getAddr8(x, y); | |
339 SkPMColor16 srcColor = fPMColor16; | |
340 size_t devRB = fDevice.rowBytes() - (width << 1); | |
341 unsigned maskRB = mask.fRowBytes - width; | |
342 | |
343 do { | |
344 int w = width; | |
345 do { | |
346 unsigned aa = *alpha++; | |
347 *device = SkBlendARGB4444(srcColor, *device, aa); | |
348 device += 1; | |
349 } while (--w != 0); | |
350 device = (SkPMColor16*)((char*)device + devRB); | |
351 alpha += maskRB; | |
352 } while (--height != 0); | |
353 } | |
354 | |
355 /////////////////////////////////////////////////////////////////////////////// | |
356 | |
357 class SkARGB4444_Shader_Blitter : public SkShaderBlitter { | |
358 SkXfermode* fXfermode; | |
359 SkBlitRow::Proc fOpaqueProc; | |
360 SkBlitRow::Proc fAlphaProc; | |
361 SkPMColor* fBuffer; | |
362 uint8_t* fAAExpand; | |
363 public: | |
364 | |
365 SkARGB4444_Shader_Blitter(const SkBitmap& device, const SkPaint& paint) | |
366 : INHERITED(device, paint) { | |
367 const int width = device.width(); | |
368 fBuffer = (SkPMColor*)sk_malloc_throw(width * sizeof(SkPMColor) + width); | |
369 fAAExpand = (uint8_t*)(fBuffer + width); | |
370 | |
371 fXfermode = paint.getXfermode(); | |
372 SkSafeRef(fXfermode); | |
373 | |
374 unsigned flags = 0; | |
375 if (!(fShader->getFlags() & SkShader::kOpaqueAlpha_Flag)) { | |
376 flags |= SkBlitRow::kSrcPixelAlpha_Flag; | |
377 } | |
378 if (paint.isDither()) { | |
379 flags |= SkBlitRow::kDither_Flag; | |
380 } | |
381 fOpaqueProc = SkBlitRow::Factory(flags, SkBitmap::kARGB_4444_Config); | |
382 fAlphaProc = SkBlitRow::Factory(flags | SkBlitRow::kGlobalAlpha_Flag, | |
383 SkBitmap::kARGB_4444_Config); | |
384 } | |
385 | |
386 virtual ~SkARGB4444_Shader_Blitter() { | |
387 SkSafeUnref(fXfermode); | |
388 sk_free(fBuffer); | |
389 } | |
390 | |
391 virtual void blitH(int x, int y, int width) { | |
392 SkASSERT(x >= 0 && y >= 0 && x + width <= fDevice.width()); | |
393 | |
394 SkPMColor16* device = fDevice.getAddr16(x, y); | |
395 SkPMColor* span = fBuffer; | |
396 | |
397 fShader->shadeSpan(x, y, span, width); | |
398 if (fXfermode) { | |
399 fXfermode->xfer4444(device, span, width, NULL); | |
400 } else { | |
401 fOpaqueProc(device, span, width, 0xFF, x, y); | |
402 } | |
403 } | |
404 | |
405 virtual void blitAntiH(int x, int y, const SkAlpha antialias[], | |
406 const int16_t runs[]) { | |
407 SkPMColor* SK_RESTRICT span = fBuffer; | |
408 uint8_t* SK_RESTRICT aaExpand = fAAExpand; | |
409 SkPMColor16* device = fDevice.getAddr16(x, y); | |
410 SkShader* shader = fShader; | |
411 SkXfermode* xfer = fXfermode; | |
412 | |
413 if (NULL != xfer) { | |
414 for (;;) { | |
415 int count = *runs; | |
416 if (count <= 0) { | |
417 break; | |
418 } | |
419 int aa = *antialias; | |
420 if (aa) { | |
421 shader->shadeSpan(x, y, span, count); | |
422 if (255 == aa) { | |
423 xfer->xfer4444(device, span, count, NULL); | |
424 } else { | |
425 const uint8_t* aaBuffer = antialias; | |
426 if (count > 1) { | |
427 memset(aaExpand, aa, count); | |
428 aaBuffer = aaExpand; | |
429 } | |
430 xfer->xfer4444(device, span, count, aaBuffer); | |
431 } | |
432 } | |
433 device += count; | |
434 runs += count; | |
435 antialias += count; | |
436 x += count; | |
437 } | |
438 } else { // no xfermode | |
439 for (;;) { | |
440 int count = *runs; | |
441 if (count <= 0) { | |
442 break; | |
443 } | |
444 int aa = *antialias; | |
445 if (aa) { | |
446 fShader->shadeSpan(x, y, span, count); | |
447 if (255 == aa) { | |
448 fOpaqueProc(device, span, count, aa, x, y); | |
449 } else { | |
450 fAlphaProc(device, span, count, aa, x, y); | |
451 } | |
452 } | |
453 device += count; | |
454 runs += count; | |
455 antialias += count; | |
456 x += count; | |
457 } | |
458 } | |
459 } | |
460 | |
461 private: | |
462 typedef SkShaderBlitter INHERITED; | |
463 }; | |
464 | |
465 /////////////////////////////////////////////////////////////////////////////// | |
466 /////////////////////////////////////////////////////////////////////////////// | |
467 | |
468 SkBlitter* SkBlitter_ChooseD4444(const SkBitmap& device, | |
469 const SkPaint& paint, | |
470 void* storage, size_t storageSize) | |
471 { | |
472 SkBlitter* blitter; | |
473 | |
474 if (paint.getShader()) { | |
475 SK_PLACEMENT_NEW_ARGS(blitter, SkARGB4444_Shader_Blitter, storage, stora
geSize, (device, paint)); | |
476 } else { | |
477 SK_PLACEMENT_NEW_ARGS(blitter, SkARGB4444_Blitter, storage, storageSize,
(device, paint)); | |
478 } | |
479 return blitter; | |
480 } | |
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