reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame^] | 1 | /* libs/graphics/sgl/SkBitmapSampler.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 "SkBitmapSampler.h" |
| 19 | |
| 20 | static SkTileModeProc get_tilemode_proc(SkShader::TileMode mode) |
| 21 | { |
| 22 | switch (mode) { |
| 23 | case SkShader::kClamp_TileMode: |
| 24 | return do_clamp; |
| 25 | case SkShader::kRepeat_TileMode: |
| 26 | return do_repeat_mod; |
| 27 | case SkShader::kMirror_TileMode: |
| 28 | return do_mirror_mod; |
| 29 | default: |
| 30 | SkASSERT(!"unknown mode"); |
| 31 | return NULL; |
| 32 | } |
| 33 | } |
| 34 | |
| 35 | SkBitmapSampler::SkBitmapSampler(const SkBitmap& bm, bool filter, |
| 36 | SkShader::TileMode tmx, SkShader::TileMode tmy) |
| 37 | : fBitmap(bm), fFilterBitmap(filter), fTileModeX(tmx), fTileModeY(tmy) |
| 38 | { |
| 39 | SkASSERT(bm.width() > 0 && bm.height() > 0); |
| 40 | |
| 41 | fMaxX = SkToU16(bm.width() - 1); |
| 42 | fMaxY = SkToU16(bm.height() - 1); |
| 43 | |
| 44 | fTileProcX = get_tilemode_proc(tmx); |
| 45 | fTileProcY = get_tilemode_proc(tmy); |
| 46 | } |
| 47 | |
| 48 | void SkBitmapSampler::setPaint(const SkPaint& paint) |
| 49 | { |
| 50 | } |
| 51 | |
| 52 | class SkNullBitmapSampler : public SkBitmapSampler { |
| 53 | public: |
| 54 | SkNullBitmapSampler(const SkBitmap& bm, bool filter, |
| 55 | SkShader::TileMode tmx, SkShader::TileMode tmy) |
| 56 | : SkBitmapSampler(bm, filter, tmx, tmy) {} |
| 57 | |
| 58 | virtual SkPMColor sample(SkFixed x, SkFixed y) const { return 0; } |
| 59 | }; |
| 60 | |
| 61 | ///////////////////////////////////////////////////////////////////////////////// |
| 62 | ///////////////////////////////////////////////////////////////////////////////// |
| 63 | |
| 64 | #define BITMAP_CLASSNAME_PREFIX(name) ARGB32##name |
| 65 | #define BITMAP_PIXEL_TO_PMCOLOR(bitmap, x, y) *bitmap.getAddr32(x, y) |
| 66 | #include "SkBitmapSamplerTemplate.h" |
| 67 | |
| 68 | #include "SkColorPriv.h" |
| 69 | |
| 70 | #define BITMAP_CLASSNAME_PREFIX(name) RGB16##name |
| 71 | #define BITMAP_PIXEL_TO_PMCOLOR(bitmap, x, y) SkPixel16ToPixel32(*bitmap.getAddr16(x, y)) |
| 72 | #include "SkBitmapSamplerTemplate.h" |
| 73 | |
| 74 | #define BITMAP_CLASSNAME_PREFIX(name) Index8##name |
| 75 | #define BITMAP_PIXEL_TO_PMCOLOR(bitmap, x, y) bitmap.getIndex8Color(x, y) |
| 76 | #include "SkBitmapSamplerTemplate.h" |
| 77 | |
| 78 | ///////////////////////////////////////////////////////////////////////////////// |
| 79 | ///////////////////////////////////////////////////////////////////////////////// |
| 80 | ///////////////// The Bilinear versions |
| 81 | |
| 82 | #include "SkFilterProc.h" |
| 83 | |
| 84 | class ARGB32_Bilinear_Sampler : public SkBitmapSampler { |
| 85 | public: |
| 86 | ARGB32_Bilinear_Sampler(const SkBitmap& bm, SkShader::TileMode tmx, SkShader::TileMode tmy) |
| 87 | : SkBitmapSampler(bm, true, tmx, tmy) |
| 88 | { |
| 89 | fPtrProcTable = SkGetBilinearFilterPtrProcTable(); |
| 90 | } |
| 91 | |
| 92 | virtual SkPMColor sample(SkFixed x, SkFixed y) const |
| 93 | { |
| 94 | const uint32_t *p00, *p01, *p10, *p11; |
| 95 | |
| 96 | // turn pixel centers into the top-left of our filter-box |
| 97 | x -= SK_FixedHalf; |
| 98 | y -= SK_FixedHalf; |
| 99 | |
| 100 | // compute our pointers |
| 101 | { |
| 102 | const SkBitmap* bitmap = &fBitmap; |
| 103 | int ix = x >> 16; |
| 104 | int iy = y >> 16; |
| 105 | |
| 106 | int maxX = fMaxX; |
| 107 | SkTileModeProc procX = fTileProcX; |
| 108 | int maxY = fMaxY; |
| 109 | SkTileModeProc procY = fTileProcY; |
| 110 | |
| 111 | int tmpx = procX(ix, maxX); |
| 112 | int tmpy = procY(iy, maxY); |
| 113 | p00 = bitmap->getAddr32(tmpx, tmpy); |
| 114 | |
| 115 | int tmpx1 = procX(ix + 1, maxX); |
| 116 | p01 = bitmap->getAddr32(tmpx1, tmpy); |
| 117 | |
| 118 | int tmpy1 = procY(iy + 1, maxY); |
| 119 | p10 = bitmap->getAddr32(tmpx, tmpy1); |
| 120 | |
| 121 | p11 = bitmap->getAddr32(tmpx1, tmpy1); |
| 122 | } |
| 123 | |
| 124 | SkFilterPtrProc proc = SkGetBilinearFilterPtrProc(fPtrProcTable, x, y); |
| 125 | return proc(p00, p01, p10, p11); |
| 126 | } |
| 127 | |
| 128 | private: |
| 129 | const SkFilterPtrProc* fPtrProcTable; |
| 130 | }; |
| 131 | |
| 132 | class RGB16_Bilinear_Sampler : public SkBitmapSampler { |
| 133 | public: |
| 134 | RGB16_Bilinear_Sampler(const SkBitmap& bm, SkShader::TileMode tmx, SkShader::TileMode tmy) |
| 135 | : SkBitmapSampler(bm, true, tmx, tmy) |
| 136 | { |
| 137 | fProcTable = SkGetBilinearFilterProcTable(); |
| 138 | } |
| 139 | |
| 140 | virtual SkPMColor sample(SkFixed x, SkFixed y) const |
| 141 | { |
| 142 | const uint16_t *p00, *p01, *p10, *p11; |
| 143 | |
| 144 | // turn pixel centers into the top-left of our filter-box |
| 145 | x -= SK_FixedHalf; |
| 146 | y -= SK_FixedHalf; |
| 147 | |
| 148 | // compute our pointers |
| 149 | { |
| 150 | const SkBitmap* bitmap = &fBitmap; |
| 151 | int ix = x >> 16; |
| 152 | int iy = y >> 16; |
| 153 | |
| 154 | int maxX = fMaxX; |
| 155 | SkTileModeProc procX = fTileProcX; |
| 156 | int maxY = fMaxY; |
| 157 | SkTileModeProc procY = fTileProcY; |
| 158 | |
| 159 | int tmpx = procX(ix, maxX); |
| 160 | int tmpy = procY(iy, maxY); |
| 161 | p00 = bitmap->getAddr16(tmpx, tmpy); |
| 162 | |
| 163 | int tmpx1 = procX(ix + 1, maxX); |
| 164 | p01 = bitmap->getAddr16(tmpx1, tmpy); |
| 165 | |
| 166 | int tmpy1 = procY(iy + 1, maxY); |
| 167 | p10 = bitmap->getAddr16(tmpx, tmpy1); |
| 168 | |
| 169 | p11 = bitmap->getAddr16(tmpx1, tmpy1); |
| 170 | } |
| 171 | |
| 172 | SkFilterProc proc = SkGetBilinearFilterProc(fProcTable, x, y); |
| 173 | uint32_t c = proc(SkExpand_rgb_16(*p00), SkExpand_rgb_16(*p01), |
| 174 | SkExpand_rgb_16(*p10), SkExpand_rgb_16(*p11)); |
| 175 | |
| 176 | return SkPixel16ToPixel32((uint16_t)SkCompact_rgb_16(c)); |
| 177 | } |
| 178 | |
| 179 | private: |
| 180 | const SkFilterProc* fProcTable; |
| 181 | }; |
| 182 | |
| 183 | // If we had a init/term method on sampler, we could avoid the per-pixel |
| 184 | // call to lockColors/unlockColors |
| 185 | |
| 186 | class Index8_Bilinear_Sampler : public SkBitmapSampler { |
| 187 | public: |
| 188 | Index8_Bilinear_Sampler(const SkBitmap& bm, SkShader::TileMode tmx, SkShader::TileMode tmy) |
| 189 | : SkBitmapSampler(bm, true, tmx, tmy) |
| 190 | { |
| 191 | fPtrProcTable = SkGetBilinearFilterPtrProcTable(); |
| 192 | } |
| 193 | |
| 194 | virtual SkPMColor sample(SkFixed x, SkFixed y) const |
| 195 | { |
| 196 | const SkBitmap* bitmap = &fBitmap; |
| 197 | |
| 198 | const uint8_t *p00, *p01, *p10, *p11; |
| 199 | |
| 200 | // turn pixel centers into the top-left of our filter-box |
| 201 | x -= SK_FixedHalf; |
| 202 | y -= SK_FixedHalf; |
| 203 | |
| 204 | // compute our pointers |
| 205 | { |
| 206 | int ix = x >> 16; |
| 207 | int iy = y >> 16; |
| 208 | |
| 209 | int maxX = fMaxX; |
| 210 | SkTileModeProc procX = fTileProcX; |
| 211 | int maxY = fMaxY; |
| 212 | SkTileModeProc procY = fTileProcY; |
| 213 | |
| 214 | int tmpx = procX(ix, maxX); |
| 215 | int tmpy = procY(iy, maxY); |
| 216 | p00 = bitmap->getAddr8(tmpx, tmpy); |
| 217 | |
| 218 | int tmpx1 = procX(ix + 1, maxX); |
| 219 | p01 = bitmap->getAddr8(tmpx1, tmpy); |
| 220 | |
| 221 | int tmpy1 = procY(iy + 1, maxY); |
| 222 | p10 = bitmap->getAddr8(tmpx, tmpy1); |
| 223 | |
| 224 | p11 = bitmap->getAddr8(tmpx1, tmpy1); |
| 225 | } |
| 226 | |
| 227 | const SkPMColor* colors = bitmap->getColorTable()->lockColors(); |
| 228 | |
| 229 | SkFilterPtrProc proc = SkGetBilinearFilterPtrProc(fPtrProcTable, x, y); |
| 230 | uint32_t c = proc(&colors[*p00], &colors[*p01], &colors[*p10], &colors[*p11]); |
| 231 | |
| 232 | bitmap->getColorTable()->unlockColors(false); |
| 233 | |
| 234 | return c; |
| 235 | } |
| 236 | |
| 237 | private: |
| 238 | const SkFilterPtrProc* fPtrProcTable; |
| 239 | }; |
| 240 | |
| 241 | class A8_Bilinear_Sampler : public SkBitmapSampler { |
| 242 | public: |
| 243 | A8_Bilinear_Sampler(const SkBitmap& bm, SkShader::TileMode tmx, SkShader::TileMode tmy) |
| 244 | : SkBitmapSampler(bm, true, tmx, tmy) |
| 245 | { |
| 246 | fProcTable = SkGetBilinearFilterProcTable(); |
| 247 | } |
| 248 | |
| 249 | virtual void setPaint(const SkPaint& paint) |
| 250 | { |
| 251 | fColor = SkPreMultiplyColor(paint.getColor()); |
| 252 | } |
| 253 | |
| 254 | virtual SkPMColor sample(SkFixed x, SkFixed y) const |
| 255 | { |
| 256 | const uint8_t *p00, *p01, *p10, *p11; |
| 257 | |
| 258 | // turn pixel centers into the top-left of our filter-box |
| 259 | x -= SK_FixedHalf; |
| 260 | y -= SK_FixedHalf; |
| 261 | |
| 262 | // compute our pointers |
| 263 | { |
| 264 | const SkBitmap* bitmap = &fBitmap; |
| 265 | int ix = x >> 16; |
| 266 | int iy = y >> 16; |
| 267 | |
| 268 | int maxX = fMaxX; |
| 269 | SkTileModeProc procX = fTileProcX; |
| 270 | int maxY = fMaxY; |
| 271 | SkTileModeProc procY = fTileProcY; |
| 272 | |
| 273 | int tmpx = procX(ix, maxX); |
| 274 | int tmpy = procY(iy, maxY); |
| 275 | p00 = bitmap->getAddr8(tmpx, tmpy); |
| 276 | |
| 277 | int tmpx1 = procX(ix + 1, maxX); |
| 278 | p01 = bitmap->getAddr8(tmpx1, tmpy); |
| 279 | |
| 280 | int tmpy1 = procY(iy + 1, maxY); |
| 281 | p10 = bitmap->getAddr8(tmpx, tmpy1); |
| 282 | |
| 283 | p11 = bitmap->getAddr8(tmpx1, tmpy1); |
| 284 | } |
| 285 | |
| 286 | SkFilterProc proc = SkGetBilinearFilterProc(fProcTable, x, y); |
| 287 | int alpha = proc(*p00, *p01, *p10, *p11); |
| 288 | return SkAlphaMulQ(fColor, SkAlpha255To256(alpha)); |
| 289 | } |
| 290 | |
| 291 | private: |
| 292 | const SkFilterProc* fProcTable; |
| 293 | SkPMColor fColor; |
| 294 | }; |
| 295 | |
| 296 | class A8_NoFilter_Sampler : public SkBitmapSampler { |
| 297 | public: |
| 298 | A8_NoFilter_Sampler(const SkBitmap& bm, SkShader::TileMode tmx, SkShader::TileMode tmy) |
| 299 | : SkBitmapSampler(bm, false, tmx, tmy) |
| 300 | { |
| 301 | } |
| 302 | |
| 303 | virtual void setPaint(const SkPaint& paint) |
| 304 | { |
| 305 | fColor = SkPreMultiplyColor(paint.getColor()); |
| 306 | } |
| 307 | |
| 308 | virtual SkPMColor sample(SkFixed x, SkFixed y) const |
| 309 | { |
| 310 | int ix = SkFixedFloor(x); |
| 311 | int iy = SkFixedFloor(y); |
| 312 | |
| 313 | int alpha = *fBitmap.getAddr8(fTileProcX(ix, fMaxX), fTileProcY(iy, fMaxY)); |
| 314 | return SkAlphaMulQ(fColor, SkAlpha255To256(alpha)); |
| 315 | } |
| 316 | |
| 317 | private: |
| 318 | const SkFilterProc* fProcTable; |
| 319 | SkPMColor fColor; |
| 320 | }; |
| 321 | |
| 322 | /////////////////////////////////////////////////////////////////////////////// |
| 323 | /////////////////////////////////////////////////////////////////////////////// |
| 324 | |
| 325 | SkBitmapSampler* SkBitmapSampler::Create(const SkBitmap& bm, bool doFilter, |
| 326 | SkShader::TileMode tmx, |
| 327 | SkShader::TileMode tmy) |
| 328 | { |
| 329 | switch (bm.getConfig()) { |
| 330 | case SkBitmap::kARGB_8888_Config: |
| 331 | if (doFilter) |
| 332 | return SkNEW_ARGS(ARGB32_Bilinear_Sampler, (bm, tmx, tmy)); |
| 333 | |
| 334 | if (tmx == tmy) { |
| 335 | switch (tmx) { |
| 336 | case SkShader::kClamp_TileMode: |
| 337 | return SkNEW_ARGS(ARGB32_Point_Clamp_Sampler, (bm)); |
| 338 | case SkShader::kRepeat_TileMode: |
| 339 | if (is_pow2(bm.width()) && is_pow2(bm.height())) |
| 340 | return SkNEW_ARGS(ARGB32_Point_Repeat_Pow2_Sampler, (bm)); |
| 341 | else |
| 342 | return SkNEW_ARGS(ARGB32_Point_Repeat_Mod_Sampler, (bm)); |
| 343 | case SkShader::kMirror_TileMode: |
| 344 | if (is_pow2(bm.width()) && is_pow2(bm.height())) |
| 345 | return SkNEW_ARGS(ARGB32_Point_Mirror_Pow2_Sampler, (bm)); |
| 346 | else |
| 347 | return SkNEW_ARGS(ARGB32_Point_Mirror_Mod_Sampler, (bm)); |
| 348 | default: |
| 349 | SkASSERT(!"unknown mode"); |
| 350 | } |
| 351 | } |
| 352 | else { // tmx != tmy |
| 353 | return SkNEW_ARGS(ARGB32_Point_Sampler, (bm, tmx, tmy)); |
| 354 | } |
| 355 | break; |
| 356 | |
| 357 | case SkBitmap::kRGB_565_Config: |
| 358 | if (doFilter) |
| 359 | return SkNEW_ARGS(RGB16_Bilinear_Sampler, (bm, tmx, tmy)); |
| 360 | |
| 361 | if (tmx == tmy) { |
| 362 | switch (tmx) { |
| 363 | case SkShader::kClamp_TileMode: |
| 364 | return SkNEW_ARGS(RGB16_Point_Clamp_Sampler, (bm)); |
| 365 | case SkShader::kRepeat_TileMode: |
| 366 | if (is_pow2(bm.width()) && is_pow2(bm.height())) |
| 367 | return SkNEW_ARGS(RGB16_Point_Repeat_Pow2_Sampler, (bm)); |
| 368 | else |
| 369 | return SkNEW_ARGS(RGB16_Point_Repeat_Mod_Sampler, (bm)); |
| 370 | case SkShader::kMirror_TileMode: |
| 371 | if (is_pow2(bm.width()) && is_pow2(bm.height())) |
| 372 | return SkNEW_ARGS(RGB16_Point_Mirror_Pow2_Sampler, (bm)); |
| 373 | else |
| 374 | return SkNEW_ARGS(RGB16_Point_Mirror_Mod_Sampler, (bm)); |
| 375 | default: |
| 376 | SkASSERT(!"unknown mode"); |
| 377 | } |
| 378 | } |
| 379 | else { // tmx != tmy |
| 380 | return SkNEW_ARGS(RGB16_Point_Sampler, (bm, tmx, tmy)); |
| 381 | } |
| 382 | break; |
| 383 | |
| 384 | case SkBitmap::kIndex8_Config: |
| 385 | if (doFilter) |
| 386 | return SkNEW_ARGS(Index8_Bilinear_Sampler, (bm, tmx, tmy)); |
| 387 | |
| 388 | if (tmx == tmy) { |
| 389 | switch (tmx) { |
| 390 | case SkShader::kClamp_TileMode: |
| 391 | return SkNEW_ARGS(Index8_Point_Clamp_Sampler, (bm)); |
| 392 | case SkShader::kRepeat_TileMode: |
| 393 | if (is_pow2(bm.width()) && is_pow2(bm.height())) |
| 394 | return SkNEW_ARGS(Index8_Point_Repeat_Pow2_Sampler, (bm)); |
| 395 | else |
| 396 | return SkNEW_ARGS(Index8_Point_Repeat_Mod_Sampler, (bm)); |
| 397 | case SkShader::kMirror_TileMode: |
| 398 | if (is_pow2(bm.width()) && is_pow2(bm.height())) |
| 399 | return SkNEW_ARGS(Index8_Point_Mirror_Pow2_Sampler, (bm)); |
| 400 | else |
| 401 | return SkNEW_ARGS(Index8_Point_Mirror_Mod_Sampler, (bm)); |
| 402 | default: |
| 403 | SkASSERT(!"unknown mode"); |
| 404 | } |
| 405 | } |
| 406 | else { // tmx != tmy |
| 407 | return SkNEW_ARGS(Index8_Point_Sampler, (bm, tmx, tmy)); |
| 408 | } |
| 409 | break; |
| 410 | |
| 411 | case SkBitmap::kA8_Config: |
| 412 | if (doFilter) |
| 413 | return SkNEW_ARGS(A8_Bilinear_Sampler, (bm, tmx, tmy)); |
| 414 | else |
| 415 | return SkNEW_ARGS(A8_NoFilter_Sampler, (bm, tmx, tmy)); |
| 416 | break; |
| 417 | |
| 418 | default: |
| 419 | SkASSERT(!"unknown device"); |
| 420 | } |
| 421 | return SkNEW_ARGS(SkNullBitmapSampler, (bm, doFilter, tmx, tmy)); |
| 422 | } |
| 423 | |