reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame^] | 1 | /* libs/graphics/sgl/SkBlitter_A8.cpp |
| 2 | ** |
| 3 | ** Copyright 2006, The Android Open Source Project |
| 4 | ** |
| 5 | ** Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | ** you may not use this file except in compliance with the License. |
| 7 | ** You may obtain a copy of the License at |
| 8 | ** |
| 9 | ** http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | ** |
| 11 | ** Unless required by applicable law or agreed to in writing, software |
| 12 | ** distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | ** See the License for the specific language governing permissions and |
| 15 | ** limitations under the License. |
| 16 | */ |
| 17 | |
| 18 | #include "SkCoreBlitters.h" |
| 19 | #include "SkColorPriv.h" |
| 20 | #include "SkShader.h" |
| 21 | #include "SkXfermode.h" |
| 22 | |
| 23 | SkA8_Blitter::SkA8_Blitter(const SkBitmap& device, const SkPaint& paint) |
| 24 | : INHERITED(device) |
| 25 | { |
| 26 | fSrcA = SkColorGetA(paint.getColor()); |
| 27 | } |
| 28 | |
| 29 | const SkBitmap* SkA8_Blitter::justAnOpaqueColor(uint32_t* value) |
| 30 | { |
| 31 | if (255 == fSrcA) |
| 32 | { |
| 33 | *value = 255; |
| 34 | return &fDevice; |
| 35 | } |
| 36 | return NULL; |
| 37 | } |
| 38 | |
| 39 | void SkA8_Blitter::blitH(int x, int y, int width) |
| 40 | { |
| 41 | SkASSERT(x >= 0 && y >= 0 && (unsigned)(x + width) <= (unsigned)fDevice.width()); |
| 42 | |
| 43 | if (fSrcA == 0) |
| 44 | return; |
| 45 | |
| 46 | uint8_t* device = fDevice.getAddr8(x, y); |
| 47 | |
| 48 | if (fSrcA == 255) |
| 49 | { |
| 50 | memset(device, 0xFF, width); |
| 51 | } |
| 52 | else |
| 53 | { |
| 54 | unsigned scale = 256 - SkAlpha255To256(fSrcA); |
| 55 | unsigned srcA = fSrcA; |
| 56 | |
| 57 | for (int i = 0; i < width; i++) |
| 58 | { |
| 59 | device[i] = SkToU8(srcA + SkAlphaMul(device[i], scale)); |
| 60 | } |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | void SkA8_Blitter::blitAntiH(int x, int y, const SkAlpha antialias[], const int16_t runs[]) |
| 65 | { |
| 66 | if (fSrcA == 0) |
| 67 | return; |
| 68 | |
| 69 | uint8_t* device = fDevice.getAddr8(x, y); |
| 70 | unsigned srcA = fSrcA; |
| 71 | |
| 72 | for (;;) |
| 73 | { |
| 74 | int count = runs[0]; |
| 75 | SkASSERT(count >= 0); |
| 76 | if (count == 0) |
| 77 | return; |
| 78 | unsigned aa = antialias[0]; |
| 79 | |
| 80 | if (aa == 255 && srcA == 255) |
| 81 | memset(device, 0xFF, count); |
| 82 | else |
| 83 | { |
| 84 | unsigned sa = SkAlphaMul(srcA, SkAlpha255To256(aa)); |
| 85 | unsigned scale = 256 - sa; |
| 86 | |
| 87 | for (int i = 0; i < count; i++) |
| 88 | { |
| 89 | device[i] = SkToU8(sa + SkAlphaMul(device[i], scale)); |
| 90 | } |
| 91 | } |
| 92 | runs += count; |
| 93 | antialias += count; |
| 94 | device += count; |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | ///////////////////////////////////////////////////////////////////////////////////// |
| 99 | |
| 100 | #define solid_8_pixels(mask, dst) \ |
| 101 | do { \ |
| 102 | if (mask & 0x80) dst[0] = 0xFF; \ |
| 103 | if (mask & 0x40) dst[1] = 0xFF; \ |
| 104 | if (mask & 0x20) dst[2] = 0xFF; \ |
| 105 | if (mask & 0x10) dst[3] = 0xFF; \ |
| 106 | if (mask & 0x08) dst[4] = 0xFF; \ |
| 107 | if (mask & 0x04) dst[5] = 0xFF; \ |
| 108 | if (mask & 0x02) dst[6] = 0xFF; \ |
| 109 | if (mask & 0x01) dst[7] = 0xFF; \ |
| 110 | } while (0) |
| 111 | |
| 112 | #define SK_BLITBWMASK_NAME SkA8_BlitBW |
| 113 | #define SK_BLITBWMASK_ARGS |
| 114 | #define SK_BLITBWMASK_BLIT8(mask, dst) solid_8_pixels(mask, dst) |
| 115 | #define SK_BLITBWMASK_GETADDR getAddr8 |
| 116 | #define SK_BLITBWMASK_DEVTYPE uint8_t |
| 117 | #include "SkBlitBWMaskTemplate.h" |
| 118 | |
| 119 | static inline void blend_8_pixels(U8CPU bw, uint8_t dst[], U8CPU sa, unsigned dst_scale) |
| 120 | { |
| 121 | if (bw & 0x80) dst[0] = SkToU8(sa + SkAlphaMul(dst[0], dst_scale)); |
| 122 | if (bw & 0x40) dst[1] = SkToU8(sa + SkAlphaMul(dst[1], dst_scale)); |
| 123 | if (bw & 0x20) dst[2] = SkToU8(sa + SkAlphaMul(dst[2], dst_scale)); |
| 124 | if (bw & 0x10) dst[3] = SkToU8(sa + SkAlphaMul(dst[3], dst_scale)); |
| 125 | if (bw & 0x08) dst[4] = SkToU8(sa + SkAlphaMul(dst[4], dst_scale)); |
| 126 | if (bw & 0x04) dst[5] = SkToU8(sa + SkAlphaMul(dst[5], dst_scale)); |
| 127 | if (bw & 0x02) dst[6] = SkToU8(sa + SkAlphaMul(dst[6], dst_scale)); |
| 128 | if (bw & 0x01) dst[7] = SkToU8(sa + SkAlphaMul(dst[7], dst_scale)); |
| 129 | } |
| 130 | |
| 131 | #define SK_BLITBWMASK_NAME SkA8_BlendBW |
| 132 | #define SK_BLITBWMASK_ARGS , U8CPU sa, unsigned dst_scale |
| 133 | #define SK_BLITBWMASK_BLIT8(mask, dst) blend_8_pixels(mask, dst, sa, dst_scale) |
| 134 | #define SK_BLITBWMASK_GETADDR getAddr8 |
| 135 | #define SK_BLITBWMASK_DEVTYPE uint8_t |
| 136 | #include "SkBlitBWMaskTemplate.h" |
| 137 | |
| 138 | void SkA8_Blitter::blitMask(const SkMask& mask, const SkIRect& clip) |
| 139 | { |
| 140 | if (fSrcA == 0) |
| 141 | return; |
| 142 | |
| 143 | if (mask.fFormat == SkMask::kBW_Format) |
| 144 | { |
| 145 | if (fSrcA == 0xFF) |
| 146 | SkA8_BlitBW(fDevice, mask, clip); |
| 147 | else |
| 148 | SkA8_BlendBW(fDevice, mask, clip, fSrcA, SkAlpha255To256(255 - fSrcA)); |
| 149 | return; |
| 150 | } |
| 151 | |
| 152 | int x = clip.fLeft; |
| 153 | int y = clip.fTop; |
| 154 | int width = clip.width(); |
| 155 | int height = clip.height(); |
| 156 | uint8_t* device = fDevice.getAddr8(x, y); |
| 157 | const uint8_t* alpha = mask.getAddr(x, y); |
| 158 | unsigned srcA = fSrcA; |
| 159 | |
| 160 | while (--height >= 0) |
| 161 | { |
| 162 | for (int i = width - 1; i >= 0; --i) |
| 163 | { |
| 164 | unsigned sa; |
| 165 | // scale our src by the alpha value |
| 166 | { |
| 167 | int aa = alpha[i]; |
| 168 | if (aa == 0) |
| 169 | continue; |
| 170 | |
| 171 | if (aa == 255) |
| 172 | { |
| 173 | if (srcA == 255) |
| 174 | { |
| 175 | device[i] = 0xFF; |
| 176 | continue; |
| 177 | } |
| 178 | sa = srcA; |
| 179 | } |
| 180 | else |
| 181 | sa = SkAlphaMul(srcA, SkAlpha255To256(aa)); |
| 182 | } |
| 183 | |
| 184 | int scale = 256 - SkAlpha255To256(sa); |
| 185 | device[i] = SkToU8(sa + SkAlphaMul(device[i], scale)); |
| 186 | } |
| 187 | device += fDevice.rowBytes(); |
| 188 | alpha += mask.fRowBytes; |
| 189 | } |
| 190 | } |
| 191 | |
| 192 | /////////////////////////////////////////////////////////////////////////////////////// |
| 193 | |
| 194 | void SkA8_Blitter::blitV(int x, int y, int height, SkAlpha alpha) |
| 195 | { |
| 196 | if (fSrcA == 0) |
| 197 | return; |
| 198 | |
| 199 | unsigned sa = SkAlphaMul(fSrcA, SkAlpha255To256(alpha)); |
| 200 | uint8_t* device = fDevice.getAddr8(x, y); |
| 201 | int rowBytes = fDevice.rowBytes(); |
| 202 | |
| 203 | if (sa == 0xFF) |
| 204 | { |
| 205 | for (int i = 0; i < height; i++) |
| 206 | { |
| 207 | *device = SkToU8(sa); |
| 208 | device += rowBytes; |
| 209 | } |
| 210 | } |
| 211 | else |
| 212 | { |
| 213 | unsigned scale = 256 - SkAlpha255To256(sa); |
| 214 | |
| 215 | for (int i = 0; i < height; i++) |
| 216 | { |
| 217 | *device = SkToU8(sa + SkAlphaMul(*device, scale)); |
| 218 | device += rowBytes; |
| 219 | } |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | void SkA8_Blitter::blitRect(int x, int y, int width, int height) |
| 224 | { |
| 225 | SkASSERT(x >= 0 && y >= 0 && (unsigned)(x + width) <= (unsigned)fDevice.width() && (unsigned)(y + height) <= (unsigned)fDevice.height()); |
| 226 | |
| 227 | if (fSrcA == 0) |
| 228 | return; |
| 229 | |
| 230 | uint8_t* device = fDevice.getAddr8(x, y); |
| 231 | unsigned srcA = fSrcA; |
| 232 | |
| 233 | if (srcA == 255) |
| 234 | { |
| 235 | while (--height >= 0) |
| 236 | { |
| 237 | memset(device, 0xFF, width); |
| 238 | device += fDevice.rowBytes(); |
| 239 | } |
| 240 | } |
| 241 | else |
| 242 | { |
| 243 | unsigned scale = 256 - SkAlpha255To256(srcA); |
| 244 | |
| 245 | while (--height >= 0) |
| 246 | { |
| 247 | for (int i = 0; i < width; i++) |
| 248 | { |
| 249 | device[i] = SkToU8(srcA + SkAlphaMul(device[i], scale)); |
| 250 | } |
| 251 | device += fDevice.rowBytes(); |
| 252 | } |
| 253 | } |
| 254 | } |
| 255 | |
| 256 | /////////////////////////////////////////////////////////////////////// |
| 257 | |
| 258 | SkA8_Shader_Blitter::SkA8_Shader_Blitter(const SkBitmap& device, const SkPaint& paint) |
| 259 | : INHERITED(device, paint) |
| 260 | { |
| 261 | if ((fXfermode = paint.getXfermode()) != NULL) |
| 262 | { |
| 263 | fXfermode->ref(); |
| 264 | SkASSERT(fShader); |
| 265 | } |
| 266 | |
| 267 | int width = device.width(); |
| 268 | fBuffer = (SkPMColor*)sk_malloc_throw(sizeof(SkPMColor) * (width + (SkAlign4(width) >> 2))); |
| 269 | fAAExpand = (uint8_t*)(fBuffer + width); |
| 270 | } |
| 271 | |
| 272 | SkA8_Shader_Blitter::~SkA8_Shader_Blitter() |
| 273 | { |
| 274 | fXfermode->safeUnref(); |
| 275 | sk_free(fBuffer); |
| 276 | } |
| 277 | |
| 278 | void SkA8_Shader_Blitter::blitH(int x, int y, int width) |
| 279 | { |
| 280 | SkASSERT(x >= 0 && y >= 0 && (unsigned)(x + width) <= (unsigned)fDevice.width()); |
| 281 | |
| 282 | uint8_t* device = fDevice.getAddr8(x, y); |
| 283 | |
| 284 | if ((fShader->getFlags() & SkShader::kOpaqueAlpha_Flag) && fXfermode == NULL) |
| 285 | { |
| 286 | memset(device, 0xFF, width); |
| 287 | } |
| 288 | else |
| 289 | { |
| 290 | SkPMColor* span = fBuffer; |
| 291 | |
| 292 | fShader->shadeSpan(x, y, span, width); |
| 293 | if (fXfermode) |
| 294 | fXfermode->xferA8(device, span, width, NULL); |
| 295 | else |
| 296 | { |
| 297 | for (int i = width - 1; i >= 0; --i) |
| 298 | { |
| 299 | unsigned srcA = SkGetPackedA32(span[i]); |
| 300 | unsigned scale = 256 - SkAlpha255To256(srcA); |
| 301 | |
| 302 | device[i] = SkToU8(srcA + SkAlphaMul(device[i], scale)); |
| 303 | } |
| 304 | } |
| 305 | } |
| 306 | } |
| 307 | |
| 308 | static inline uint8_t aa_blend8(SkPMColor src, U8CPU da, int aa) |
| 309 | { |
| 310 | SkASSERT((unsigned)aa <= 255); |
| 311 | |
| 312 | int src_scale = SkAlpha255To256(aa); |
| 313 | int sa = SkGetPackedA32(src); |
| 314 | int dst_scale = 256 - SkAlphaMul(sa, src_scale); |
| 315 | |
| 316 | return SkToU8((sa * src_scale + da * dst_scale) >> 8); |
| 317 | } |
| 318 | |
| 319 | void SkA8_Shader_Blitter::blitAntiH(int x, int y, const SkAlpha antialias[], const int16_t runs[]) |
| 320 | { |
| 321 | SkShader* shader = fShader; |
| 322 | SkXfermode* mode = fXfermode; |
| 323 | uint8_t* aaExpand = fAAExpand; |
| 324 | SkPMColor* span = fBuffer; |
| 325 | uint8_t* device = fDevice.getAddr8(x, y); |
| 326 | int opaque = fShader->getFlags() & SkShader::kOpaqueAlpha_Flag; |
| 327 | |
| 328 | for (;;) |
| 329 | { |
| 330 | int count = *runs; |
| 331 | if (count == 0) |
| 332 | break; |
| 333 | int aa = *antialias; |
| 334 | if (aa) |
| 335 | { |
| 336 | if (opaque && aa == 255 && mode == NULL) |
| 337 | memset(device, 0xFF, count); |
| 338 | else |
| 339 | { |
| 340 | shader->shadeSpan(x, y, span, count); |
| 341 | if (mode) |
| 342 | { |
| 343 | memset(aaExpand, aa, count); |
| 344 | mode->xferA8(device, span, count, aaExpand); |
| 345 | } |
| 346 | else |
| 347 | { |
| 348 | for (int i = count - 1; i >= 0; --i) |
| 349 | device[i] = aa_blend8(span[i], device[i], aa); |
| 350 | } |
| 351 | } |
| 352 | } |
| 353 | device += count; |
| 354 | runs += count; |
| 355 | antialias += count; |
| 356 | x += count; |
| 357 | } |
| 358 | } |
| 359 | |
| 360 | void SkA8_Shader_Blitter::blitMask(const SkMask& mask, const SkIRect& clip) |
| 361 | { |
| 362 | if (mask.fFormat == SkMask::kBW_Format) |
| 363 | { |
| 364 | this->INHERITED::blitMask(mask, clip); |
| 365 | return; |
| 366 | } |
| 367 | |
| 368 | int x = clip.fLeft; |
| 369 | int y = clip.fTop; |
| 370 | int width = clip.width(); |
| 371 | int height = clip.height(); |
| 372 | uint8_t* device = fDevice.getAddr8(x, y); |
| 373 | const uint8_t* alpha = mask.getAddr(x, y); |
| 374 | |
| 375 | SkPMColor* span = fBuffer; |
| 376 | |
| 377 | while (--height >= 0) |
| 378 | { |
| 379 | fShader->shadeSpan(x, y, span, width); |
| 380 | fXfermode->xferA8(device, span, width, alpha); |
| 381 | |
| 382 | y += 1; |
| 383 | device += fDevice.rowBytes(); |
| 384 | alpha += mask.fRowBytes; |
| 385 | } |
| 386 | } |
| 387 | |