reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2006 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include "SkXfermode.h" |
| 18 | #include "SkColorPriv.h" |
| 19 | |
| 20 | #define SkAlphaMulAlpha(a, b) SkMulDiv255Round(a, b) |
| 21 | |
| 22 | static SkPMColor SkFourByteInterp(SkPMColor src, SkPMColor dst, U8CPU alpha) { |
| 23 | unsigned scale = SkAlpha255To256(alpha); |
| 24 | |
| 25 | unsigned a = SkAlphaBlend(SkGetPackedA32(src), SkGetPackedA32(dst), scale); |
| 26 | unsigned r = SkAlphaBlend(SkGetPackedR32(src), SkGetPackedR32(dst), scale); |
| 27 | unsigned g = SkAlphaBlend(SkGetPackedG32(src), SkGetPackedG32(dst), scale); |
| 28 | unsigned b = SkAlphaBlend(SkGetPackedB32(src), SkGetPackedB32(dst), scale); |
| 29 | |
| 30 | return SkPackARGB32(a, r, g, b); |
| 31 | } |
| 32 | |
reed@android.com | fc25abd | 2009-01-15 14:38:33 +0000 | [diff] [blame] | 33 | #if 0 |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 34 | // idea for higher precision blends in xfer procs (and slightly faster) |
| 35 | // see DstATop as a probable caller |
| 36 | static U8CPU mulmuldiv255round(U8CPU a, U8CPU b, U8CPU c, U8CPU d) { |
| 37 | SkASSERT(a <= 255); |
| 38 | SkASSERT(b <= 255); |
| 39 | SkASSERT(c <= 255); |
| 40 | SkASSERT(d <= 255); |
| 41 | unsigned prod = SkMulS16(a, b) + SkMulS16(c, d) + 128; |
| 42 | unsigned result = (prod + (prod >> 8)) >> 8; |
| 43 | SkASSERT(result <= 255); |
| 44 | return result; |
| 45 | } |
reed@android.com | fc25abd | 2009-01-15 14:38:33 +0000 | [diff] [blame] | 46 | #endif |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 47 | |
deanm@chromium.org | da94699 | 2009-07-03 12:54:24 +0000 | [diff] [blame] | 48 | static inline unsigned saturated_add(unsigned a, unsigned b) { |
reed@android.com | 543ed93 | 2009-04-24 12:43:40 +0000 | [diff] [blame] | 49 | SkASSERT(a <= 255); |
| 50 | SkASSERT(b <= 255); |
| 51 | unsigned sum = a + b; |
| 52 | if (sum > 255) { |
| 53 | sum = 255; |
| 54 | } |
| 55 | return sum; |
| 56 | } |
| 57 | |
deanm@chromium.org | da94699 | 2009-07-03 12:54:24 +0000 | [diff] [blame] | 58 | static inline int clamp_signed_byte(int n) { |
reed@android.com | a0f5d15 | 2009-06-22 17:38:10 +0000 | [diff] [blame] | 59 | if (n < 0) { |
| 60 | n = 0; |
| 61 | } else if (n > 255) { |
| 62 | n = 255; |
| 63 | } |
| 64 | return n; |
| 65 | } |
| 66 | |
deanm@chromium.org | da94699 | 2009-07-03 12:54:24 +0000 | [diff] [blame] | 67 | static inline int clamp_div255round(int prod) { |
reed@android.com | a0f5d15 | 2009-06-22 17:38:10 +0000 | [diff] [blame] | 68 | if (prod <= 0) { |
| 69 | return 0; |
| 70 | } else if (prod >= 255*255) { |
| 71 | return 255; |
| 72 | } else { |
| 73 | return SkDiv255Round(prod); |
| 74 | } |
| 75 | } |
| 76 | |
deanm@chromium.org | da94699 | 2009-07-03 12:54:24 +0000 | [diff] [blame] | 77 | static inline int clamp_max(int value, int max) { |
reed@android.com | a0f5d15 | 2009-06-22 17:38:10 +0000 | [diff] [blame] | 78 | if (value > max) { |
| 79 | value = max; |
| 80 | } |
| 81 | return value; |
| 82 | } |
| 83 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 84 | /////////////////////////////////////////////////////////////////////////////// |
| 85 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 86 | // kClear_Mode, //!< [0, 0] |
| 87 | static SkPMColor clear_modeproc(SkPMColor src, SkPMColor dst) { |
| 88 | return 0; |
| 89 | } |
| 90 | |
| 91 | // kSrc_Mode, //!< [Sa, Sc] |
| 92 | static SkPMColor src_modeproc(SkPMColor src, SkPMColor dst) { |
| 93 | return src; |
| 94 | } |
| 95 | |
| 96 | // kDst_Mode, //!< [Da, Dc] |
| 97 | static SkPMColor dst_modeproc(SkPMColor src, SkPMColor dst) { |
| 98 | return dst; |
| 99 | } |
| 100 | |
reed@android.com | 1116fb2 | 2009-03-03 20:31:12 +0000 | [diff] [blame] | 101 | // kSrcOver_Mode, //!< [Sa + Da - Sa*Da, Sc + (1 - Sa)*Dc] |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 102 | static SkPMColor srcover_modeproc(SkPMColor src, SkPMColor dst) { |
reed@android.com | 1116fb2 | 2009-03-03 20:31:12 +0000 | [diff] [blame] | 103 | #if 0 |
| 104 | // this is the old, more-correct way, but it doesn't guarantee that dst==255 |
| 105 | // will always stay opaque |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 106 | return src + SkAlphaMulQ(dst, SkAlpha255To256(255 - SkGetPackedA32(src))); |
reed@android.com | 1116fb2 | 2009-03-03 20:31:12 +0000 | [diff] [blame] | 107 | #else |
| 108 | // this is slightly faster, but more importantly guarantees that dst==255 |
| 109 | // will always stay opaque |
| 110 | return src + SkAlphaMulQ(dst, 256 - SkGetPackedA32(src)); |
| 111 | #endif |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 112 | } |
| 113 | |
reed@android.com | 1116fb2 | 2009-03-03 20:31:12 +0000 | [diff] [blame] | 114 | // kDstOver_Mode, //!< [Sa + Da - Sa*Da, Dc + (1 - Da)*Sc] |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 115 | static SkPMColor dstover_modeproc(SkPMColor src, SkPMColor dst) { |
reed@android.com | 1116fb2 | 2009-03-03 20:31:12 +0000 | [diff] [blame] | 116 | // this is the reverse of srcover, just flipping src and dst |
| 117 | // see srcover's comment about the 256 for opaqueness guarantees |
| 118 | return dst + SkAlphaMulQ(src, 256 - SkGetPackedA32(dst)); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 119 | } |
| 120 | |
| 121 | // kSrcIn_Mode, //!< [Sa * Da, Sc * Da] |
| 122 | static SkPMColor srcin_modeproc(SkPMColor src, SkPMColor dst) { |
| 123 | return SkAlphaMulQ(src, SkAlpha255To256(SkGetPackedA32(dst))); |
| 124 | } |
| 125 | |
| 126 | // kDstIn_Mode, //!< [Sa * Da, Sa * Dc] |
| 127 | static SkPMColor dstin_modeproc(SkPMColor src, SkPMColor dst) { |
| 128 | return SkAlphaMulQ(dst, SkAlpha255To256(SkGetPackedA32(src))); |
| 129 | } |
| 130 | |
| 131 | // kSrcOut_Mode, //!< [Sa * (1 - Da), Sc * (1 - Da)] |
| 132 | static SkPMColor srcout_modeproc(SkPMColor src, SkPMColor dst) { |
| 133 | return SkAlphaMulQ(src, SkAlpha255To256(255 - SkGetPackedA32(dst))); |
| 134 | } |
| 135 | |
| 136 | // kDstOut_Mode, //!< [Da * (1 - Sa), Dc * (1 - Sa)] |
| 137 | static SkPMColor dstout_modeproc(SkPMColor src, SkPMColor dst) { |
| 138 | return SkAlphaMulQ(dst, SkAlpha255To256(255 - SkGetPackedA32(src))); |
| 139 | } |
| 140 | |
| 141 | // kSrcATop_Mode, //!< [Da, Sc * Da + (1 - Sa) * Dc] |
| 142 | static SkPMColor srcatop_modeproc(SkPMColor src, SkPMColor dst) { |
| 143 | unsigned sa = SkGetPackedA32(src); |
| 144 | unsigned da = SkGetPackedA32(dst); |
| 145 | unsigned isa = 255 - sa; |
| 146 | |
| 147 | return SkPackARGB32(da, |
| 148 | SkAlphaMulAlpha(da, SkGetPackedR32(src)) + |
| 149 | SkAlphaMulAlpha(isa, SkGetPackedR32(dst)), |
| 150 | SkAlphaMulAlpha(da, SkGetPackedG32(src)) + |
| 151 | SkAlphaMulAlpha(isa, SkGetPackedG32(dst)), |
| 152 | SkAlphaMulAlpha(da, SkGetPackedB32(src)) + |
| 153 | SkAlphaMulAlpha(isa, SkGetPackedB32(dst))); |
| 154 | } |
| 155 | |
| 156 | // kDstATop_Mode, //!< [Sa, Sa * Dc + Sc * (1 - Da)] |
| 157 | static SkPMColor dstatop_modeproc(SkPMColor src, SkPMColor dst) { |
| 158 | unsigned sa = SkGetPackedA32(src); |
| 159 | unsigned da = SkGetPackedA32(dst); |
| 160 | unsigned ida = 255 - da; |
| 161 | |
| 162 | return SkPackARGB32(sa, |
| 163 | SkAlphaMulAlpha(ida, SkGetPackedR32(src)) + |
| 164 | SkAlphaMulAlpha(sa, SkGetPackedR32(dst)), |
| 165 | SkAlphaMulAlpha(ida, SkGetPackedG32(src)) + |
| 166 | SkAlphaMulAlpha(sa, SkGetPackedG32(dst)), |
| 167 | SkAlphaMulAlpha(ida, SkGetPackedB32(src)) + |
| 168 | SkAlphaMulAlpha(sa, SkGetPackedB32(dst))); |
| 169 | } |
| 170 | |
| 171 | // kXor_Mode [Sa + Da - 2 * Sa * Da, Sc * (1 - Da) + (1 - Sa) * Dc] |
| 172 | static SkPMColor xor_modeproc(SkPMColor src, SkPMColor dst) { |
| 173 | unsigned sa = SkGetPackedA32(src); |
| 174 | unsigned da = SkGetPackedA32(dst); |
| 175 | unsigned isa = 255 - sa; |
| 176 | unsigned ida = 255 - da; |
| 177 | |
| 178 | return SkPackARGB32(sa + da - (SkAlphaMulAlpha(sa, da) << 1), |
| 179 | SkAlphaMulAlpha(ida, SkGetPackedR32(src)) + |
| 180 | SkAlphaMulAlpha(isa, SkGetPackedR32(dst)), |
| 181 | SkAlphaMulAlpha(ida, SkGetPackedG32(src)) + |
| 182 | SkAlphaMulAlpha(isa, SkGetPackedG32(dst)), |
| 183 | SkAlphaMulAlpha(ida, SkGetPackedB32(src)) + |
| 184 | SkAlphaMulAlpha(isa, SkGetPackedB32(dst))); |
| 185 | } |
| 186 | |
reed@android.com | a0f5d15 | 2009-06-22 17:38:10 +0000 | [diff] [blame] | 187 | /////////////////////////////////////////////////////////////////////////////// |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 188 | |
reed@android.com | a0f5d15 | 2009-06-22 17:38:10 +0000 | [diff] [blame] | 189 | // kPlus_Mode |
| 190 | static SkPMColor plus_modeproc(SkPMColor src, SkPMColor dst) { |
reed@android.com | a0f5d15 | 2009-06-22 17:38:10 +0000 | [diff] [blame] | 191 | unsigned b = saturated_add(SkGetPackedB32(src), SkGetPackedB32(dst)); |
deanm@chromium.org | da94699 | 2009-07-03 12:54:24 +0000 | [diff] [blame] | 192 | unsigned g = saturated_add(SkGetPackedG32(src), SkGetPackedG32(dst)); |
| 193 | unsigned r = saturated_add(SkGetPackedR32(src), SkGetPackedR32(dst)); |
| 194 | unsigned a = saturated_add(SkGetPackedA32(src), SkGetPackedA32(dst)); |
reed@android.com | a0f5d15 | 2009-06-22 17:38:10 +0000 | [diff] [blame] | 195 | return SkPackARGB32(a, r, g, b); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 196 | } |
| 197 | |
reed@android.com | a0f5d15 | 2009-06-22 17:38:10 +0000 | [diff] [blame] | 198 | // kMultiply_Mode |
| 199 | static SkPMColor multiply_modeproc(SkPMColor src, SkPMColor dst) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 200 | int a = SkAlphaMulAlpha(SkGetPackedA32(src), SkGetPackedA32(dst)); |
| 201 | int r = SkAlphaMulAlpha(SkGetPackedR32(src), SkGetPackedR32(dst)); |
| 202 | int g = SkAlphaMulAlpha(SkGetPackedG32(src), SkGetPackedG32(dst)); |
| 203 | int b = SkAlphaMulAlpha(SkGetPackedB32(src), SkGetPackedB32(dst)); |
| 204 | return SkPackARGB32(a, r, g, b); |
| 205 | } |
| 206 | |
reed@android.com | a0f5d15 | 2009-06-22 17:38:10 +0000 | [diff] [blame] | 207 | // kScreen_Mode |
| 208 | static inline int srcover_byte(int a, int b) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 209 | return a + b - SkAlphaMulAlpha(a, b); |
| 210 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 211 | static SkPMColor screen_modeproc(SkPMColor src, SkPMColor dst) { |
reed@android.com | a0f5d15 | 2009-06-22 17:38:10 +0000 | [diff] [blame] | 212 | int a = srcover_byte(SkGetPackedA32(src), SkGetPackedA32(dst)); |
| 213 | int r = srcover_byte(SkGetPackedR32(src), SkGetPackedR32(dst)); |
| 214 | int g = srcover_byte(SkGetPackedG32(src), SkGetPackedG32(dst)); |
| 215 | int b = srcover_byte(SkGetPackedB32(src), SkGetPackedB32(dst)); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 216 | return SkPackARGB32(a, r, g, b); |
| 217 | } |
| 218 | |
reed@android.com | a0f5d15 | 2009-06-22 17:38:10 +0000 | [diff] [blame] | 219 | // kOverlay_Mode |
| 220 | static inline int overlay_byte(int sc, int dc, int sa, int da) { |
| 221 | int tmp = sc * (255 - da) + dc * (255 - sa); |
| 222 | int rc; |
| 223 | if (2 * dc <= da) { |
| 224 | rc = 2 * sc * dc; |
| 225 | } else { |
| 226 | rc = sa * da - 2 * (da - dc) * (sa - sc); |
| 227 | } |
| 228 | return clamp_div255round(rc + tmp); |
| 229 | } |
| 230 | static SkPMColor overlay_modeproc(SkPMColor src, SkPMColor dst) { |
| 231 | int sa = SkGetPackedA32(src); |
| 232 | int da = SkGetPackedA32(dst); |
| 233 | int a = srcover_byte(sa, da); |
| 234 | int r = overlay_byte(SkGetPackedR32(src), SkGetPackedR32(dst), sa, da); |
| 235 | int g = overlay_byte(SkGetPackedG32(src), SkGetPackedG32(dst), sa, da); |
| 236 | int b = overlay_byte(SkGetPackedB32(src), SkGetPackedB32(dst), sa, da); |
| 237 | return SkPackARGB32(a, r, g, b); |
| 238 | } |
| 239 | |
| 240 | // kDarken_Mode |
| 241 | static inline int darken_byte(int sc, int dc, int sa, int da) { |
| 242 | int sd = sc * da; |
| 243 | int ds = dc * sa; |
| 244 | if (sd < ds) { |
| 245 | // srcover |
| 246 | return sc + dc - SkDiv255Round(ds); |
| 247 | } else { |
| 248 | // dstover |
| 249 | return dc + sc - SkDiv255Round(sd); |
| 250 | } |
| 251 | } |
| 252 | static SkPMColor darken_modeproc(SkPMColor src, SkPMColor dst) { |
| 253 | int sa = SkGetPackedA32(src); |
| 254 | int da = SkGetPackedA32(dst); |
| 255 | int a = srcover_byte(sa, da); |
| 256 | int r = darken_byte(SkGetPackedR32(src), SkGetPackedR32(dst), sa, da); |
| 257 | int g = darken_byte(SkGetPackedG32(src), SkGetPackedG32(dst), sa, da); |
| 258 | int b = darken_byte(SkGetPackedB32(src), SkGetPackedB32(dst), sa, da); |
| 259 | return SkPackARGB32(a, r, g, b); |
| 260 | } |
| 261 | |
| 262 | // kLighten_Mode |
| 263 | static inline int lighten_byte(int sc, int dc, int sa, int da) { |
| 264 | int sd = sc * da; |
| 265 | int ds = dc * sa; |
| 266 | if (sd > ds) { |
| 267 | // srcover |
| 268 | return sc + dc - SkDiv255Round(ds); |
| 269 | } else { |
| 270 | // dstover |
| 271 | return dc + sc - SkDiv255Round(sd); |
| 272 | } |
| 273 | } |
| 274 | static SkPMColor lighten_modeproc(SkPMColor src, SkPMColor dst) { |
| 275 | int sa = SkGetPackedA32(src); |
| 276 | int da = SkGetPackedA32(dst); |
| 277 | int a = srcover_byte(sa, da); |
| 278 | int r = lighten_byte(SkGetPackedR32(src), SkGetPackedR32(dst), sa, da); |
| 279 | int g = lighten_byte(SkGetPackedG32(src), SkGetPackedG32(dst), sa, da); |
| 280 | int b = lighten_byte(SkGetPackedB32(src), SkGetPackedB32(dst), sa, da); |
| 281 | return SkPackARGB32(a, r, g, b); |
| 282 | } |
| 283 | |
| 284 | // kColorDodge_Mode |
| 285 | static inline int colordodge_byte(int sc, int dc, int sa, int da) { |
| 286 | int diff = sa - sc; |
| 287 | int rc; |
| 288 | if (0 == diff) { |
| 289 | rc = sa * da + sc * (255 - da) + dc * (255 - sa); |
| 290 | rc = SkDiv255Round(rc); |
| 291 | } else { |
| 292 | int tmp = (dc * sa << 15) / (da * diff); |
| 293 | rc = SkDiv255Round(sa * da) * tmp >> 15; |
| 294 | // don't clamp here, since we'll do it in our modeproc |
| 295 | } |
| 296 | return rc; |
| 297 | } |
| 298 | static SkPMColor colordodge_modeproc(SkPMColor src, SkPMColor dst) { |
| 299 | // added to avoid div-by-zero in colordodge_byte |
| 300 | if (0 == dst) { |
| 301 | return src; |
| 302 | } |
| 303 | |
| 304 | int sa = SkGetPackedA32(src); |
| 305 | int da = SkGetPackedA32(dst); |
| 306 | int a = srcover_byte(sa, da); |
| 307 | int r = colordodge_byte(SkGetPackedR32(src), SkGetPackedR32(dst), sa, da); |
| 308 | int g = colordodge_byte(SkGetPackedG32(src), SkGetPackedG32(dst), sa, da); |
| 309 | int b = colordodge_byte(SkGetPackedB32(src), SkGetPackedB32(dst), sa, da); |
| 310 | r = clamp_max(r, a); |
| 311 | g = clamp_max(g, a); |
| 312 | b = clamp_max(b, a); |
| 313 | return SkPackARGB32(a, r, g, b); |
| 314 | } |
| 315 | |
| 316 | // kColorBurn_Mode |
| 317 | static inline int colorburn_byte(int sc, int dc, int sa, int da) { |
| 318 | int rc; |
| 319 | if (dc == da && 0 == sc) { |
| 320 | rc = sa * da + dc * (255 - sa); |
| 321 | } else if (0 == sc) { |
| 322 | return SkAlphaMulAlpha(dc, 255 - sa); |
| 323 | } else { |
| 324 | int tmp = (sa * (da - dc) * 256) / (sc * da); |
| 325 | if (tmp > 256) { |
| 326 | tmp = 256; |
| 327 | } |
| 328 | int tmp2 = sa * da; |
| 329 | rc = tmp2 - (tmp2 * tmp >> 8) + sc * (255 - da) + dc * (255 - sa); |
| 330 | } |
| 331 | return SkDiv255Round(rc); |
| 332 | } |
| 333 | static SkPMColor colorburn_modeproc(SkPMColor src, SkPMColor dst) { |
| 334 | // added to avoid div-by-zero in colorburn_byte |
| 335 | if (0 == dst) { |
| 336 | return src; |
| 337 | } |
| 338 | |
| 339 | int sa = SkGetPackedA32(src); |
| 340 | int da = SkGetPackedA32(dst); |
| 341 | int a = srcover_byte(sa, da); |
| 342 | int r = colorburn_byte(SkGetPackedR32(src), SkGetPackedR32(dst), sa, da); |
| 343 | int g = colorburn_byte(SkGetPackedG32(src), SkGetPackedG32(dst), sa, da); |
| 344 | int b = colorburn_byte(SkGetPackedB32(src), SkGetPackedB32(dst), sa, da); |
| 345 | return SkPackARGB32(a, r, g, b); |
| 346 | } |
| 347 | |
| 348 | // kHardLight_Mode |
| 349 | static inline int hardlight_byte(int sc, int dc, int sa, int da) { |
| 350 | int rc; |
| 351 | if (2 * sc <= sa) { |
| 352 | rc = 2 * sc * dc; |
| 353 | } else { |
| 354 | rc = sa * da - 2 * (da - dc) * (sa - sc); |
| 355 | } |
| 356 | return clamp_div255round(rc + sc * (255 - da) + dc * (255 - sa)); |
| 357 | } |
| 358 | static SkPMColor hardlight_modeproc(SkPMColor src, SkPMColor dst) { |
| 359 | int sa = SkGetPackedA32(src); |
| 360 | int da = SkGetPackedA32(dst); |
| 361 | int a = srcover_byte(sa, da); |
| 362 | int r = hardlight_byte(SkGetPackedR32(src), SkGetPackedR32(dst), sa, da); |
| 363 | int g = hardlight_byte(SkGetPackedG32(src), SkGetPackedG32(dst), sa, da); |
| 364 | int b = hardlight_byte(SkGetPackedB32(src), SkGetPackedB32(dst), sa, da); |
| 365 | return SkPackARGB32(a, r, g, b); |
| 366 | } |
| 367 | |
| 368 | // returns 255 * sqrt(n/255) |
| 369 | static U8CPU sqrt_unit_byte(U8CPU n) { |
| 370 | return SkSqrtBits(n, 15+4); |
| 371 | } |
| 372 | |
| 373 | // kSoftLight_Mode |
| 374 | static inline int softlight_byte(int sc, int dc, int sa, int da) { |
| 375 | int m = da ? dc * 256 / da : 0; |
| 376 | int rc; |
| 377 | if (2 * sc <= sa) { |
| 378 | rc = dc * (sa + ((2 * sc - sa) * (256 - m) >> 8)); |
| 379 | } else if (4 * dc <= da) { |
| 380 | int tmp = (4 * m * (4 * m + 256) * (m - 256) >> 16) + 7 * m; |
| 381 | rc = dc * sa + (da * (2 * sc - sa) * tmp >> 8); |
| 382 | } else { |
| 383 | int tmp = sqrt_unit_byte(m) - m; |
| 384 | rc = dc * sa + (da * (2 * sc - sa) * tmp >> 8); |
| 385 | } |
| 386 | return clamp_div255round(rc + sc * (255 - da) + dc * (255 - sa)); |
| 387 | } |
| 388 | static SkPMColor softlight_modeproc(SkPMColor src, SkPMColor dst) { |
| 389 | int sa = SkGetPackedA32(src); |
| 390 | int da = SkGetPackedA32(dst); |
| 391 | int a = srcover_byte(sa, da); |
| 392 | int r = softlight_byte(SkGetPackedR32(src), SkGetPackedR32(dst), sa, da); |
| 393 | int g = softlight_byte(SkGetPackedG32(src), SkGetPackedG32(dst), sa, da); |
| 394 | int b = softlight_byte(SkGetPackedB32(src), SkGetPackedB32(dst), sa, da); |
| 395 | return SkPackARGB32(a, r, g, b); |
| 396 | } |
| 397 | |
| 398 | // kDifference_Mode |
| 399 | static inline int difference_byte(int sc, int dc, int sa, int da) { |
| 400 | int tmp = SkMin32(sc * da, dc * sa); |
| 401 | return clamp_signed_byte(sc + dc - 2 * SkDiv255Round(tmp)); |
| 402 | } |
| 403 | static SkPMColor difference_modeproc(SkPMColor src, SkPMColor dst) { |
| 404 | int sa = SkGetPackedA32(src); |
| 405 | int da = SkGetPackedA32(dst); |
| 406 | int a = srcover_byte(sa, da); |
| 407 | int r = difference_byte(SkGetPackedR32(src), SkGetPackedR32(dst), sa, da); |
| 408 | int g = difference_byte(SkGetPackedG32(src), SkGetPackedG32(dst), sa, da); |
| 409 | int b = difference_byte(SkGetPackedB32(src), SkGetPackedB32(dst), sa, da); |
| 410 | return SkPackARGB32(a, r, g, b); |
| 411 | } |
| 412 | |
| 413 | // kExclusion_Mode |
| 414 | static inline int exclusion_byte(int sc, int dc, int sa, int da) { |
| 415 | // this equations is wacky, wait for SVG to confirm it |
| 416 | int r = sc * da + dc * sa - 2 * sc * dc + sc * (255 - da) + dc * (255 - sa); |
| 417 | return clamp_div255round(r); |
| 418 | } |
| 419 | static SkPMColor exclusion_modeproc(SkPMColor src, SkPMColor dst) { |
| 420 | int sa = SkGetPackedA32(src); |
| 421 | int da = SkGetPackedA32(dst); |
| 422 | int a = srcover_byte(sa, da); |
| 423 | int r = exclusion_byte(SkGetPackedR32(src), SkGetPackedR32(dst), sa, da); |
| 424 | int g = exclusion_byte(SkGetPackedG32(src), SkGetPackedG32(dst), sa, da); |
| 425 | int b = exclusion_byte(SkGetPackedB32(src), SkGetPackedB32(dst), sa, da); |
reed@android.com | 543ed93 | 2009-04-24 12:43:40 +0000 | [diff] [blame] | 426 | return SkPackARGB32(a, r, g, b); |
| 427 | } |
| 428 | |
vandebo@chromium.org | 4854327 | 2011-02-08 19:28:07 +0000 | [diff] [blame] | 429 | struct ProcCoeff { |
| 430 | SkXfermodeProc fProc; |
| 431 | SkXfermode::Coeff fSC; |
| 432 | SkXfermode::Coeff fDC; |
| 433 | }; |
| 434 | |
| 435 | #define CANNOT_USE_COEFF SkXfermode::Coeff(-1) |
| 436 | |
| 437 | static const ProcCoeff gProcCoeffs[] = { |
| 438 | { clear_modeproc, SkXfermode::kZero_Coeff, SkXfermode::kZero_Coeff }, |
| 439 | { src_modeproc, SkXfermode::kOne_Coeff, SkXfermode::kZero_Coeff }, |
| 440 | { dst_modeproc, SkXfermode::kZero_Coeff, SkXfermode::kOne_Coeff }, |
| 441 | { srcover_modeproc, SkXfermode::kOne_Coeff, SkXfermode::kISA_Coeff }, |
| 442 | { dstover_modeproc, SkXfermode::kIDA_Coeff, SkXfermode::kOne_Coeff }, |
| 443 | { srcin_modeproc, SkXfermode::kDA_Coeff, SkXfermode::kZero_Coeff }, |
| 444 | { dstin_modeproc, SkXfermode::kZero_Coeff, SkXfermode::kSA_Coeff }, |
| 445 | { srcout_modeproc, SkXfermode::kIDA_Coeff, SkXfermode::kZero_Coeff }, |
| 446 | { dstout_modeproc, SkXfermode::kZero_Coeff, SkXfermode::kISA_Coeff }, |
| 447 | { srcatop_modeproc, SkXfermode::kDA_Coeff, SkXfermode::kISA_Coeff }, |
| 448 | { dstatop_modeproc, SkXfermode::kIDA_Coeff, SkXfermode::kSA_Coeff }, |
| 449 | { xor_modeproc, SkXfermode::kIDA_Coeff, SkXfermode::kISA_Coeff }, |
| 450 | |
reed@google.com | 521e34e | 2011-04-12 18:55:21 +0000 | [diff] [blame^] | 451 | { plus_modeproc, SkXfermode::kOne_Coeff, SkXfermode::kOne_Coeff }, |
| 452 | { multiply_modeproc,SkXfermode::kZero_Coeff, SkXfermode::kSC_Coeff }, |
vandebo@chromium.org | 4854327 | 2011-02-08 19:28:07 +0000 | [diff] [blame] | 453 | { screen_modeproc, CANNOT_USE_COEFF, CANNOT_USE_COEFF }, |
| 454 | { overlay_modeproc, CANNOT_USE_COEFF, CANNOT_USE_COEFF }, |
| 455 | { darken_modeproc, CANNOT_USE_COEFF, CANNOT_USE_COEFF }, |
| 456 | { lighten_modeproc, CANNOT_USE_COEFF, CANNOT_USE_COEFF }, |
| 457 | { colordodge_modeproc, CANNOT_USE_COEFF, CANNOT_USE_COEFF }, |
| 458 | { colorburn_modeproc, CANNOT_USE_COEFF, CANNOT_USE_COEFF }, |
| 459 | { hardlight_modeproc, CANNOT_USE_COEFF, CANNOT_USE_COEFF }, |
| 460 | { softlight_modeproc, CANNOT_USE_COEFF, CANNOT_USE_COEFF }, |
| 461 | { difference_modeproc, CANNOT_USE_COEFF, CANNOT_USE_COEFF }, |
| 462 | { exclusion_modeproc, CANNOT_USE_COEFF, CANNOT_USE_COEFF }, |
| 463 | }; |
| 464 | |
| 465 | /////////////////////////////////////////////////////////////////////////////// |
| 466 | |
| 467 | bool SkXfermode::asCoeff(Coeff* src, Coeff* dst) { |
| 468 | return false; |
| 469 | } |
| 470 | |
| 471 | bool SkXfermode::asMode(Mode* mode) { |
| 472 | return IsMode(this, mode); |
| 473 | } |
| 474 | |
| 475 | SkPMColor SkXfermode::xferColor(SkPMColor src, SkPMColor dst) { |
| 476 | // no-op. subclasses should override this |
| 477 | return dst; |
| 478 | } |
| 479 | |
| 480 | void SkXfermode::xfer32(SK_RESTRICT SkPMColor dst[], |
| 481 | const SK_RESTRICT SkPMColor src[], int count, |
| 482 | const SK_RESTRICT SkAlpha aa[]) { |
| 483 | SkASSERT(dst && src && count >= 0); |
| 484 | |
| 485 | if (NULL == aa) { |
| 486 | for (int i = count - 1; i >= 0; --i) { |
| 487 | dst[i] = this->xferColor(src[i], dst[i]); |
| 488 | } |
| 489 | } else { |
| 490 | for (int i = count - 1; i >= 0; --i) { |
| 491 | unsigned a = aa[i]; |
| 492 | if (0 != a) { |
| 493 | SkPMColor dstC = dst[i]; |
| 494 | SkPMColor C = this->xferColor(src[i], dstC); |
| 495 | if (0xFF != a) { |
| 496 | C = SkFourByteInterp(C, dstC, a); |
| 497 | } |
| 498 | dst[i] = C; |
| 499 | } |
| 500 | } |
| 501 | } |
| 502 | } |
| 503 | |
| 504 | void SkXfermode::xfer16(SK_RESTRICT uint16_t dst[], |
| 505 | const SK_RESTRICT SkPMColor src[], int count, |
| 506 | const SK_RESTRICT SkAlpha aa[]) { |
| 507 | SkASSERT(dst && src && count >= 0); |
| 508 | |
| 509 | if (NULL == aa) { |
| 510 | for (int i = count - 1; i >= 0; --i) { |
| 511 | SkPMColor dstC = SkPixel16ToPixel32(dst[i]); |
| 512 | dst[i] = SkPixel32ToPixel16_ToU16(this->xferColor(src[i], dstC)); |
| 513 | } |
| 514 | } else { |
| 515 | for (int i = count - 1; i >= 0; --i) { |
| 516 | unsigned a = aa[i]; |
| 517 | if (0 != a) { |
| 518 | SkPMColor dstC = SkPixel16ToPixel32(dst[i]); |
| 519 | SkPMColor C = this->xferColor(src[i], dstC); |
| 520 | if (0xFF != a) { |
| 521 | C = SkFourByteInterp(C, dstC, a); |
| 522 | } |
| 523 | dst[i] = SkPixel32ToPixel16_ToU16(C); |
| 524 | } |
| 525 | } |
| 526 | } |
| 527 | } |
| 528 | |
| 529 | void SkXfermode::xfer4444(SK_RESTRICT SkPMColor16 dst[], |
| 530 | const SK_RESTRICT SkPMColor src[], int count, |
| 531 | const SK_RESTRICT SkAlpha aa[]) |
| 532 | { |
| 533 | SkASSERT(dst && src && count >= 0); |
| 534 | |
| 535 | if (NULL == aa) { |
| 536 | for (int i = count - 1; i >= 0; --i) { |
| 537 | SkPMColor dstC = SkPixel4444ToPixel32(dst[i]); |
| 538 | dst[i] = SkPixel32ToPixel4444(this->xferColor(src[i], dstC)); |
| 539 | } |
| 540 | } else { |
| 541 | for (int i = count - 1; i >= 0; --i) { |
| 542 | unsigned a = aa[i]; |
| 543 | if (0 != a) { |
| 544 | SkPMColor dstC = SkPixel4444ToPixel32(dst[i]); |
| 545 | SkPMColor C = this->xferColor(src[i], dstC); |
| 546 | if (0xFF != a) { |
| 547 | C = SkFourByteInterp(C, dstC, a); |
| 548 | } |
| 549 | dst[i] = SkPixel32ToPixel4444(C); |
| 550 | } |
| 551 | } |
| 552 | } |
| 553 | } |
| 554 | |
| 555 | void SkXfermode::xferA8(SK_RESTRICT SkAlpha dst[], |
| 556 | const SkPMColor src[], int count, |
| 557 | const SK_RESTRICT SkAlpha aa[]) |
| 558 | { |
| 559 | SkASSERT(dst && src && count >= 0); |
| 560 | |
| 561 | if (NULL == aa) { |
| 562 | for (int i = count - 1; i >= 0; --i) { |
| 563 | SkPMColor res = this->xferColor(src[i], (dst[i] << SK_A32_SHIFT)); |
| 564 | dst[i] = SkToU8(SkGetPackedA32(res)); |
| 565 | } |
| 566 | } else { |
| 567 | for (int i = count - 1; i >= 0; --i) { |
| 568 | unsigned a = aa[i]; |
| 569 | if (0 != a) { |
| 570 | SkAlpha dstA = dst[i]; |
| 571 | unsigned A = SkGetPackedA32(this->xferColor(src[i], |
| 572 | (SkPMColor)(dstA << SK_A32_SHIFT))); |
| 573 | if (0xFF != a) { |
| 574 | A = SkAlphaBlend(A, dstA, SkAlpha255To256(a)); |
| 575 | } |
| 576 | dst[i] = SkToU8(A); |
| 577 | } |
| 578 | } |
| 579 | } |
| 580 | } |
| 581 | |
| 582 | /////////////////////////////////////////////////////////////////////////////// |
| 583 | |
| 584 | void SkProcXfermode::xfer32(SK_RESTRICT SkPMColor dst[], |
| 585 | const SK_RESTRICT SkPMColor src[], int count, |
| 586 | const SK_RESTRICT SkAlpha aa[]) { |
| 587 | SkASSERT(dst && src && count >= 0); |
| 588 | |
| 589 | SkXfermodeProc proc = fProc; |
| 590 | |
| 591 | if (NULL != proc) { |
| 592 | if (NULL == aa) { |
| 593 | for (int i = count - 1; i >= 0; --i) { |
| 594 | dst[i] = proc(src[i], dst[i]); |
| 595 | } |
| 596 | } else { |
| 597 | for (int i = count - 1; i >= 0; --i) { |
| 598 | unsigned a = aa[i]; |
| 599 | if (0 != a) { |
| 600 | SkPMColor dstC = dst[i]; |
| 601 | SkPMColor C = proc(src[i], dstC); |
| 602 | if (a != 0xFF) { |
| 603 | C = SkFourByteInterp(C, dstC, a); |
| 604 | } |
| 605 | dst[i] = C; |
| 606 | } |
| 607 | } |
| 608 | } |
| 609 | } |
| 610 | } |
| 611 | |
| 612 | void SkProcXfermode::xfer16(SK_RESTRICT uint16_t dst[], |
| 613 | const SK_RESTRICT SkPMColor src[], int count, |
| 614 | const SK_RESTRICT SkAlpha aa[]) { |
| 615 | SkASSERT(dst && src && count >= 0); |
| 616 | |
| 617 | SkXfermodeProc proc = fProc; |
| 618 | |
| 619 | if (NULL != proc) { |
| 620 | if (NULL == aa) { |
| 621 | for (int i = count - 1; i >= 0; --i) { |
| 622 | SkPMColor dstC = SkPixel16ToPixel32(dst[i]); |
| 623 | dst[i] = SkPixel32ToPixel16_ToU16(proc(src[i], dstC)); |
| 624 | } |
| 625 | } else { |
| 626 | for (int i = count - 1; i >= 0; --i) { |
| 627 | unsigned a = aa[i]; |
| 628 | if (0 != a) { |
| 629 | SkPMColor dstC = SkPixel16ToPixel32(dst[i]); |
| 630 | SkPMColor C = proc(src[i], dstC); |
| 631 | if (0xFF != a) { |
| 632 | C = SkFourByteInterp(C, dstC, a); |
| 633 | } |
| 634 | dst[i] = SkPixel32ToPixel16_ToU16(C); |
| 635 | } |
| 636 | } |
| 637 | } |
| 638 | } |
| 639 | } |
| 640 | |
| 641 | void SkProcXfermode::xfer4444(SK_RESTRICT SkPMColor16 dst[], |
| 642 | const SK_RESTRICT SkPMColor src[], int count, |
| 643 | const SK_RESTRICT SkAlpha aa[]) { |
| 644 | SkASSERT(dst && src && count >= 0); |
| 645 | |
| 646 | SkXfermodeProc proc = fProc; |
| 647 | |
| 648 | if (NULL != proc) { |
| 649 | if (NULL == aa) { |
| 650 | for (int i = count - 1; i >= 0; --i) { |
| 651 | SkPMColor dstC = SkPixel4444ToPixel32(dst[i]); |
| 652 | dst[i] = SkPixel32ToPixel4444(proc(src[i], dstC)); |
| 653 | } |
| 654 | } else { |
| 655 | for (int i = count - 1; i >= 0; --i) { |
| 656 | unsigned a = aa[i]; |
| 657 | if (0 != a) { |
| 658 | SkPMColor dstC = SkPixel4444ToPixel32(dst[i]); |
| 659 | SkPMColor C = proc(src[i], dstC); |
| 660 | if (0xFF != a) { |
| 661 | C = SkFourByteInterp(C, dstC, a); |
| 662 | } |
| 663 | dst[i] = SkPixel32ToPixel4444(C); |
| 664 | } |
| 665 | } |
| 666 | } |
| 667 | } |
| 668 | } |
| 669 | |
| 670 | void SkProcXfermode::xferA8(SK_RESTRICT SkAlpha dst[], |
| 671 | const SK_RESTRICT SkPMColor src[], int count, |
| 672 | const SK_RESTRICT SkAlpha aa[]) { |
| 673 | SkASSERT(dst && src && count >= 0); |
| 674 | |
| 675 | SkXfermodeProc proc = fProc; |
| 676 | |
| 677 | if (NULL != proc) { |
| 678 | if (NULL == aa) { |
| 679 | for (int i = count - 1; i >= 0; --i) { |
| 680 | SkPMColor res = proc(src[i], dst[i] << SK_A32_SHIFT); |
| 681 | dst[i] = SkToU8(SkGetPackedA32(res)); |
| 682 | } |
| 683 | } else { |
| 684 | for (int i = count - 1; i >= 0; --i) { |
| 685 | unsigned a = aa[i]; |
| 686 | if (0 != a) { |
| 687 | SkAlpha dstA = dst[i]; |
| 688 | SkPMColor res = proc(src[i], dstA << SK_A32_SHIFT); |
| 689 | unsigned A = SkGetPackedA32(res); |
| 690 | if (0xFF != a) { |
| 691 | A = SkAlphaBlend(A, dstA, SkAlpha255To256(a)); |
| 692 | } |
| 693 | dst[i] = SkToU8(A); |
| 694 | } |
| 695 | } |
| 696 | } |
| 697 | } |
| 698 | } |
| 699 | |
| 700 | SkProcXfermode::SkProcXfermode(SkFlattenableReadBuffer& buffer) |
| 701 | : SkXfermode(buffer) { |
| 702 | fProc = (SkXfermodeProc)buffer.readFunctionPtr(); |
| 703 | } |
| 704 | |
| 705 | void SkProcXfermode::flatten(SkFlattenableWriteBuffer& buffer) { |
| 706 | buffer.writeFunctionPtr((void*)fProc); |
| 707 | } |
| 708 | |
| 709 | bool SkProcXfermode::asMode(SkXfermode::Mode* mode) { |
| 710 | for (size_t i = 0; i < SK_ARRAY_COUNT(gProcCoeffs); i++) { |
| 711 | if (gProcCoeffs[i].fProc == fProc) { |
| 712 | if (mode) { |
| 713 | *mode = static_cast<Mode>(i); |
| 714 | } |
| 715 | return true; |
| 716 | } |
| 717 | } |
| 718 | return false; |
| 719 | } |
| 720 | |
| 721 | /////////////////////////////////////////////////////////////////////////////// |
| 722 | /////////////////////////////////////////////////////////////////////////////// |
| 723 | |
| 724 | class SkProcCoeffXfermode : public SkProcXfermode { |
| 725 | public: |
| 726 | SkProcCoeffXfermode(SkXfermodeProc proc, Coeff sc, Coeff dc) |
| 727 | : INHERITED(proc), fSrcCoeff(sc), fDstCoeff(dc) { |
| 728 | } |
| 729 | |
| 730 | virtual bool asCoeff(Coeff* sc, Coeff* dc) { |
| 731 | if (sc) { |
| 732 | *sc = fSrcCoeff; |
| 733 | } |
| 734 | if (dc) { |
| 735 | *dc = fDstCoeff; |
| 736 | } |
| 737 | return true; |
| 738 | } |
| 739 | |
| 740 | virtual Factory getFactory() { return CreateProc; } |
| 741 | virtual void flatten(SkFlattenableWriteBuffer& buffer) { |
| 742 | this->INHERITED::flatten(buffer); |
| 743 | buffer.write32(fSrcCoeff); |
| 744 | buffer.write32(fDstCoeff); |
| 745 | } |
| 746 | |
| 747 | protected: |
| 748 | SkProcCoeffXfermode(SkFlattenableReadBuffer& buffer) |
| 749 | : INHERITED(buffer) { |
| 750 | fSrcCoeff = (Coeff)buffer.readU32(); |
| 751 | fDstCoeff = (Coeff)buffer.readU32(); |
| 752 | } |
| 753 | |
| 754 | private: |
| 755 | Coeff fSrcCoeff, fDstCoeff; |
| 756 | |
| 757 | static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) { |
| 758 | return SkNEW_ARGS(SkProcCoeffXfermode, (buffer)); } |
| 759 | |
| 760 | typedef SkProcXfermode INHERITED; |
| 761 | }; |
| 762 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 763 | /////////////////////////////////////////////////////////////////////////////// |
| 764 | |
| 765 | class SkClearXfermode : public SkProcCoeffXfermode { |
| 766 | public: |
| 767 | SkClearXfermode() : SkProcCoeffXfermode(clear_modeproc, |
| 768 | kZero_Coeff, kZero_Coeff) {} |
| 769 | |
| 770 | virtual void xfer32(SK_RESTRICT SkPMColor dst[], |
| 771 | const SK_RESTRICT SkPMColor[], int count, |
| 772 | const SK_RESTRICT SkAlpha aa[]) { |
| 773 | SkASSERT(dst && count >= 0); |
| 774 | |
| 775 | if (NULL == aa) { |
| 776 | memset(dst, 0, count << 2); |
| 777 | } else { |
| 778 | for (int i = count - 1; i >= 0; --i) { |
| 779 | unsigned a = aa[i]; |
| 780 | if (0xFF == a) { |
| 781 | dst[i] = 0; |
| 782 | } else if (a != 0) { |
| 783 | dst[i] = SkAlphaMulQ(dst[i], SkAlpha255To256(255 - a)); |
| 784 | } |
| 785 | } |
| 786 | } |
| 787 | } |
| 788 | virtual void xferA8(SK_RESTRICT SkAlpha dst[], |
| 789 | const SK_RESTRICT SkPMColor[], int count, |
| 790 | const SK_RESTRICT SkAlpha aa[]) { |
| 791 | SkASSERT(dst && count >= 0); |
| 792 | |
| 793 | if (NULL == aa) { |
| 794 | memset(dst, 0, count); |
| 795 | } else { |
| 796 | for (int i = count - 1; i >= 0; --i) { |
| 797 | unsigned a = aa[i]; |
| 798 | if (0xFF == a) { |
| 799 | dst[i] = 0; |
| 800 | } else if (0 != a) { |
| 801 | dst[i] = SkAlphaMulAlpha(dst[i], 255 - a); |
| 802 | } |
| 803 | } |
| 804 | } |
| 805 | } |
| 806 | |
| 807 | virtual Factory getFactory() { return CreateProc; } |
| 808 | |
| 809 | private: |
| 810 | SkClearXfermode(SkFlattenableReadBuffer& buffer) |
| 811 | : SkProcCoeffXfermode(buffer) {} |
| 812 | |
| 813 | static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) { |
| 814 | return SkNEW_ARGS(SkClearXfermode, (buffer)); |
| 815 | } |
| 816 | }; |
| 817 | |
| 818 | /////////////////////////////////////////////////////////////////////////////// |
| 819 | |
| 820 | class SkSrcXfermode : public SkProcCoeffXfermode { |
| 821 | public: |
| 822 | SkSrcXfermode() : SkProcCoeffXfermode(src_modeproc, |
| 823 | kOne_Coeff, kZero_Coeff) {} |
| 824 | |
| 825 | virtual void xfer32(SK_RESTRICT SkPMColor dst[], |
| 826 | const SK_RESTRICT SkPMColor src[], int count, |
| 827 | const SK_RESTRICT SkAlpha aa[]) { |
| 828 | SkASSERT(dst && src && count >= 0); |
| 829 | |
| 830 | if (NULL == aa) { |
| 831 | memcpy(dst, src, count << 2); |
| 832 | } else { |
| 833 | for (int i = count - 1; i >= 0; --i) { |
| 834 | unsigned a = aa[i]; |
| 835 | if (a == 0xFF) { |
| 836 | dst[i] = src[i]; |
| 837 | } else if (a != 0) { |
| 838 | dst[i] = SkFourByteInterp(src[i], dst[i], a); |
| 839 | } |
| 840 | } |
| 841 | } |
| 842 | } |
| 843 | |
| 844 | virtual void xferA8(SK_RESTRICT SkAlpha dst[], |
| 845 | const SK_RESTRICT SkPMColor src[], int count, |
| 846 | const SK_RESTRICT SkAlpha aa[]) { |
| 847 | SkASSERT(dst && src && count >= 0); |
| 848 | |
| 849 | if (NULL == aa) { |
| 850 | for (int i = count - 1; i >= 0; --i) { |
| 851 | dst[i] = SkToU8(SkGetPackedA32(src[i])); |
| 852 | } |
| 853 | } else { |
| 854 | for (int i = count - 1; i >= 0; --i) { |
| 855 | unsigned a = aa[i]; |
| 856 | if (0 != a) { |
| 857 | unsigned srcA = SkGetPackedA32(src[i]); |
| 858 | if (a == 0xFF) { |
| 859 | dst[i] = SkToU8(srcA); |
| 860 | } else { |
| 861 | dst[i] = SkToU8(SkAlphaBlend(srcA, dst[i], a)); |
| 862 | } |
| 863 | } |
| 864 | } |
| 865 | } |
| 866 | } |
| 867 | |
| 868 | virtual Factory getFactory() { return CreateProc; } |
| 869 | |
| 870 | private: |
| 871 | SkSrcXfermode(SkFlattenableReadBuffer& buffer) |
| 872 | : SkProcCoeffXfermode(buffer) {} |
| 873 | |
| 874 | static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) { |
| 875 | return SkNEW_ARGS(SkSrcXfermode, (buffer)); |
| 876 | } |
| 877 | }; |
| 878 | |
| 879 | class SkDstInXfermode : public SkProcCoeffXfermode { |
| 880 | public: |
| 881 | SkDstInXfermode() : SkProcCoeffXfermode(dstin_modeproc, |
| 882 | kZero_Coeff, kSA_Coeff) {} |
| 883 | |
| 884 | virtual void xfer32(SK_RESTRICT SkPMColor dst[], |
| 885 | const SK_RESTRICT SkPMColor src[], int count, |
| 886 | const SK_RESTRICT SkAlpha aa[]) { |
| 887 | SkASSERT(dst && src); |
| 888 | |
| 889 | if (count <= 0) { |
| 890 | return; |
| 891 | } |
| 892 | if (NULL != aa) { |
| 893 | return this->INHERITED::xfer32(dst, src, count, aa); |
| 894 | } |
| 895 | |
| 896 | do { |
| 897 | unsigned a = SkGetPackedA32(*src); |
| 898 | *dst = SkAlphaMulQ(*dst, SkAlpha255To256(a)); |
| 899 | dst++; |
| 900 | src++; |
| 901 | } while (--count != 0); |
| 902 | } |
| 903 | |
| 904 | virtual Factory getFactory() { return CreateProc; } |
| 905 | |
| 906 | private: |
| 907 | SkDstInXfermode(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {} |
| 908 | |
| 909 | static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) { |
| 910 | return SkNEW_ARGS(SkDstInXfermode, (buffer)); |
| 911 | } |
| 912 | |
| 913 | typedef SkProcCoeffXfermode INHERITED; |
| 914 | }; |
| 915 | |
| 916 | class SkDstOutXfermode : public SkProcCoeffXfermode { |
| 917 | public: |
| 918 | SkDstOutXfermode() : SkProcCoeffXfermode(dstout_modeproc, |
| 919 | kZero_Coeff, kISA_Coeff) {} |
| 920 | |
| 921 | virtual void xfer32(SK_RESTRICT SkPMColor dst[], |
| 922 | const SK_RESTRICT SkPMColor src[], int count, |
| 923 | const SK_RESTRICT SkAlpha aa[]) { |
| 924 | SkASSERT(dst && src); |
| 925 | |
| 926 | if (count <= 0) { |
| 927 | return; |
| 928 | } |
| 929 | if (NULL != aa) { |
| 930 | return this->INHERITED::xfer32(dst, src, count, aa); |
| 931 | } |
| 932 | |
| 933 | do { |
| 934 | unsigned a = SkGetPackedA32(*src); |
| 935 | *dst = SkAlphaMulQ(*dst, SkAlpha255To256(255 - a)); |
| 936 | dst++; |
| 937 | src++; |
| 938 | } while (--count != 0); |
| 939 | } |
| 940 | |
| 941 | virtual Factory getFactory() { return CreateProc; } |
| 942 | |
| 943 | private: |
| 944 | SkDstOutXfermode(SkFlattenableReadBuffer& buffer) |
| 945 | : INHERITED(buffer) {} |
| 946 | |
| 947 | static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) { |
| 948 | return SkNEW_ARGS(SkDstOutXfermode, (buffer)); |
| 949 | } |
| 950 | |
| 951 | typedef SkProcCoeffXfermode INHERITED; |
| 952 | }; |
| 953 | |
| 954 | /////////////////////////////////////////////////////////////////////////////// |
| 955 | |
reed@android.com | a0f5d15 | 2009-06-22 17:38:10 +0000 | [diff] [blame] | 956 | SkXfermode* SkXfermode::Create(Mode mode) { |
| 957 | SkASSERT(SK_ARRAY_COUNT(gProcCoeffs) == kModeCount); |
| 958 | SkASSERT((unsigned)mode < kModeCount); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 959 | |
| 960 | switch (mode) { |
| 961 | case kClear_Mode: |
| 962 | return SkNEW(SkClearXfermode); |
| 963 | case kSrc_Mode: |
| 964 | return SkNEW(SkSrcXfermode); |
| 965 | case kSrcOver_Mode: |
| 966 | return NULL; |
| 967 | case kDstIn_Mode: |
| 968 | return SkNEW(SkDstInXfermode); |
| 969 | case kDstOut_Mode: |
| 970 | return SkNEW(SkDstOutXfermode); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 971 | // use the table |
| 972 | default: { |
| 973 | const ProcCoeff& rec = gProcCoeffs[mode]; |
reed@android.com | a0f5d15 | 2009-06-22 17:38:10 +0000 | [diff] [blame] | 974 | if ((unsigned)rec.fSC < SkXfermode::kCoeffCount && |
| 975 | (unsigned)rec.fDC < SkXfermode::kCoeffCount) { |
| 976 | return SkNEW_ARGS(SkProcCoeffXfermode, (rec.fProc, |
| 977 | rec.fSC, |
| 978 | rec.fDC)); |
| 979 | } else { |
| 980 | return SkNEW_ARGS(SkProcXfermode, (rec.fProc)); |
| 981 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 982 | } |
| 983 | } |
| 984 | } |
| 985 | |
reed@android.com | a0f5d15 | 2009-06-22 17:38:10 +0000 | [diff] [blame] | 986 | bool SkXfermode::IsMode(SkXfermode* xfer, Mode* mode) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 987 | if (NULL == xfer) { |
| 988 | if (mode) { |
| 989 | *mode = kSrcOver_Mode; |
| 990 | } |
| 991 | return true; |
| 992 | } |
| 993 | |
| 994 | SkXfermode::Coeff sc, dc; |
| 995 | if (xfer->asCoeff(&sc, &dc)) { |
| 996 | SkASSERT((unsigned)sc < (unsigned)SkXfermode::kCoeffCount); |
| 997 | SkASSERT((unsigned)dc < (unsigned)SkXfermode::kCoeffCount); |
| 998 | |
| 999 | const ProcCoeff* rec = gProcCoeffs; |
| 1000 | for (size_t i = 0; i < SK_ARRAY_COUNT(gProcCoeffs); i++) { |
| 1001 | if (rec[i].fSC == sc && rec[i].fDC == dc) { |
| 1002 | if (mode) { |
reed@android.com | a0f5d15 | 2009-06-22 17:38:10 +0000 | [diff] [blame] | 1003 | *mode = static_cast<Mode>(i); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1004 | } |
| 1005 | return true; |
| 1006 | } |
| 1007 | } |
| 1008 | } |
| 1009 | |
| 1010 | // no coefficients, or not found in our table |
| 1011 | return false; |
| 1012 | } |
| 1013 | |
reed@android.com | a0f5d15 | 2009-06-22 17:38:10 +0000 | [diff] [blame] | 1014 | SkXfermodeProc SkXfermode::GetProc(Mode mode) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1015 | SkXfermodeProc proc = NULL; |
reed@android.com | a0f5d15 | 2009-06-22 17:38:10 +0000 | [diff] [blame] | 1016 | if ((unsigned)mode < kModeCount) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1017 | proc = gProcCoeffs[mode].fProc; |
| 1018 | } |
| 1019 | return proc; |
| 1020 | } |
| 1021 | |
| 1022 | /////////////////////////////////////////////////////////////////////////////// |
| 1023 | //////////// 16bit xfermode procs |
| 1024 | |
| 1025 | #ifdef SK_DEBUG |
| 1026 | static bool require_255(SkPMColor src) { return SkGetPackedA32(src) == 0xFF; } |
| 1027 | static bool require_0(SkPMColor src) { return SkGetPackedA32(src) == 0; } |
| 1028 | #endif |
| 1029 | |
| 1030 | static uint16_t src_modeproc16_255(SkPMColor src, uint16_t dst) { |
| 1031 | SkASSERT(require_255(src)); |
| 1032 | return SkPixel32ToPixel16(src); |
| 1033 | } |
| 1034 | |
| 1035 | static uint16_t dst_modeproc16(SkPMColor src, uint16_t dst) { |
| 1036 | return dst; |
| 1037 | } |
| 1038 | |
| 1039 | static uint16_t srcover_modeproc16_0(SkPMColor src, uint16_t dst) { |
| 1040 | SkASSERT(require_0(src)); |
| 1041 | return dst; |
| 1042 | } |
| 1043 | |
| 1044 | static uint16_t srcover_modeproc16_255(SkPMColor src, uint16_t dst) { |
| 1045 | SkASSERT(require_255(src)); |
| 1046 | return SkPixel32ToPixel16(src); |
| 1047 | } |
| 1048 | |
| 1049 | static uint16_t dstover_modeproc16_0(SkPMColor src, uint16_t dst) { |
| 1050 | SkASSERT(require_0(src)); |
| 1051 | return dst; |
| 1052 | } |
| 1053 | |
| 1054 | static uint16_t dstover_modeproc16_255(SkPMColor src, uint16_t dst) { |
| 1055 | SkASSERT(require_255(src)); |
| 1056 | return dst; |
| 1057 | } |
| 1058 | |
| 1059 | static uint16_t srcin_modeproc16_255(SkPMColor src, uint16_t dst) { |
| 1060 | SkASSERT(require_255(src)); |
| 1061 | return SkPixel32ToPixel16(src); |
| 1062 | } |
| 1063 | |
| 1064 | static uint16_t dstin_modeproc16_255(SkPMColor src, uint16_t dst) { |
| 1065 | SkASSERT(require_255(src)); |
| 1066 | return dst; |
| 1067 | } |
| 1068 | |
| 1069 | static uint16_t dstout_modeproc16_0(SkPMColor src, uint16_t dst) { |
| 1070 | SkASSERT(require_0(src)); |
| 1071 | return dst; |
| 1072 | } |
| 1073 | |
| 1074 | static uint16_t srcatop_modeproc16(SkPMColor src, uint16_t dst) { |
| 1075 | unsigned isa = 255 - SkGetPackedA32(src); |
| 1076 | |
| 1077 | return SkPackRGB16( |
| 1078 | SkPacked32ToR16(src) + SkAlphaMulAlpha(SkGetPackedR16(dst), isa), |
| 1079 | SkPacked32ToG16(src) + SkAlphaMulAlpha(SkGetPackedG16(dst), isa), |
| 1080 | SkPacked32ToB16(src) + SkAlphaMulAlpha(SkGetPackedB16(dst), isa)); |
| 1081 | } |
| 1082 | |
| 1083 | static uint16_t srcatop_modeproc16_0(SkPMColor src, uint16_t dst) { |
| 1084 | SkASSERT(require_0(src)); |
| 1085 | return dst; |
| 1086 | } |
| 1087 | |
| 1088 | static uint16_t srcatop_modeproc16_255(SkPMColor src, uint16_t dst) { |
| 1089 | SkASSERT(require_255(src)); |
| 1090 | return SkPixel32ToPixel16(src); |
| 1091 | } |
| 1092 | |
| 1093 | static uint16_t dstatop_modeproc16_255(SkPMColor src, uint16_t dst) { |
| 1094 | SkASSERT(require_255(src)); |
| 1095 | return dst; |
| 1096 | } |
| 1097 | |
| 1098 | /********* |
| 1099 | darken and lighten boil down to this. |
| 1100 | |
| 1101 | darken = (1 - Sa) * Dc + min(Sc, Dc) |
| 1102 | lighten = (1 - Sa) * Dc + max(Sc, Dc) |
| 1103 | |
| 1104 | if (Sa == 0) these become |
| 1105 | darken = Dc + min(0, Dc) = 0 |
| 1106 | lighten = Dc + max(0, Dc) = Dc |
| 1107 | |
| 1108 | if (Sa == 1) these become |
| 1109 | darken = min(Sc, Dc) |
| 1110 | lighten = max(Sc, Dc) |
| 1111 | */ |
| 1112 | |
| 1113 | static uint16_t darken_modeproc16_0(SkPMColor src, uint16_t dst) { |
| 1114 | SkASSERT(require_0(src)); |
| 1115 | return 0; |
| 1116 | } |
| 1117 | |
| 1118 | static uint16_t darken_modeproc16_255(SkPMColor src, uint16_t dst) { |
| 1119 | SkASSERT(require_255(src)); |
| 1120 | unsigned r = SkFastMin32(SkPacked32ToR16(src), SkGetPackedR16(dst)); |
| 1121 | unsigned g = SkFastMin32(SkPacked32ToG16(src), SkGetPackedG16(dst)); |
| 1122 | unsigned b = SkFastMin32(SkPacked32ToB16(src), SkGetPackedB16(dst)); |
| 1123 | return SkPackRGB16(r, g, b); |
| 1124 | } |
| 1125 | |
| 1126 | static uint16_t lighten_modeproc16_0(SkPMColor src, uint16_t dst) { |
| 1127 | SkASSERT(require_0(src)); |
| 1128 | return dst; |
| 1129 | } |
| 1130 | |
| 1131 | static uint16_t lighten_modeproc16_255(SkPMColor src, uint16_t dst) { |
| 1132 | SkASSERT(require_255(src)); |
| 1133 | unsigned r = SkMax32(SkPacked32ToR16(src), SkGetPackedR16(dst)); |
| 1134 | unsigned g = SkMax32(SkPacked32ToG16(src), SkGetPackedG16(dst)); |
| 1135 | unsigned b = SkMax32(SkPacked32ToB16(src), SkGetPackedB16(dst)); |
| 1136 | return SkPackRGB16(r, g, b); |
| 1137 | } |
| 1138 | |
| 1139 | struct Proc16Rec { |
| 1140 | SkXfermodeProc16 fProc16_0; |
| 1141 | SkXfermodeProc16 fProc16_255; |
| 1142 | SkXfermodeProc16 fProc16_General; |
| 1143 | }; |
| 1144 | |
reed@android.com | a0f5d15 | 2009-06-22 17:38:10 +0000 | [diff] [blame] | 1145 | static const Proc16Rec gModeProcs16[] = { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1146 | { NULL, NULL, NULL }, // CLEAR |
| 1147 | { NULL, src_modeproc16_255, NULL }, |
| 1148 | { dst_modeproc16, dst_modeproc16, dst_modeproc16 }, |
| 1149 | { srcover_modeproc16_0, srcover_modeproc16_255, NULL }, |
| 1150 | { dstover_modeproc16_0, dstover_modeproc16_255, NULL }, |
| 1151 | { NULL, srcin_modeproc16_255, NULL }, |
| 1152 | { NULL, dstin_modeproc16_255, NULL }, |
| 1153 | { NULL, NULL, NULL },// SRC_OUT |
| 1154 | { dstout_modeproc16_0, NULL, NULL }, |
| 1155 | { srcatop_modeproc16_0, srcatop_modeproc16_255, srcatop_modeproc16 }, |
| 1156 | { NULL, dstatop_modeproc16_255, NULL }, |
| 1157 | { NULL, NULL, NULL }, // XOR |
reed@android.com | a0f5d15 | 2009-06-22 17:38:10 +0000 | [diff] [blame] | 1158 | |
| 1159 | { NULL, NULL, NULL }, // plus |
| 1160 | { NULL, NULL, NULL }, // multiply |
| 1161 | { NULL, NULL, NULL }, // screen |
| 1162 | { NULL, NULL, NULL }, // overlay |
| 1163 | { darken_modeproc16_0, darken_modeproc16_255, NULL }, // darken |
| 1164 | { lighten_modeproc16_0, lighten_modeproc16_255, NULL }, // lighten |
| 1165 | { NULL, NULL, NULL }, // colordodge |
| 1166 | { NULL, NULL, NULL }, // colorburn |
| 1167 | { NULL, NULL, NULL }, // hardlight |
| 1168 | { NULL, NULL, NULL }, // softlight |
| 1169 | { NULL, NULL, NULL }, // difference |
| 1170 | { NULL, NULL, NULL }, // exclusion |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1171 | }; |
| 1172 | |
reed@android.com | a0f5d15 | 2009-06-22 17:38:10 +0000 | [diff] [blame] | 1173 | SkXfermodeProc16 SkXfermode::GetProc16(Mode mode, SkColor srcColor) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1174 | SkXfermodeProc16 proc16 = NULL; |
reed@android.com | a0f5d15 | 2009-06-22 17:38:10 +0000 | [diff] [blame] | 1175 | if ((unsigned)mode < kModeCount) { |
| 1176 | const Proc16Rec& rec = gModeProcs16[mode]; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1177 | unsigned a = SkColorGetA(srcColor); |
| 1178 | |
| 1179 | if (0 == a) { |
| 1180 | proc16 = rec.fProc16_0; |
| 1181 | } else if (255 == a) { |
| 1182 | proc16 = rec.fProc16_255; |
| 1183 | } else { |
| 1184 | proc16 = rec.fProc16_General; |
| 1185 | } |
| 1186 | } |
| 1187 | return proc16; |
| 1188 | } |
| 1189 | |