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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 } | |
| OLD | NEW |
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Chromium Code Reviews
Issue 17335008:
remove dst/rendertarget support for kARGB_4444_Config (Closed)
Base URL: https://skia.googlecode.com/svn/trunk