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| 1 /* libs/graphics/effects/SkAvoidXfermode.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 "SkAvoidXfermode.h" | |
| 19 #include "SkColorPriv.h" | |
| 20 | |
| 21 SkAvoidXfermode::SkAvoidXfermode(SkColor opColor, U8CPU tolerance, Mode mode) | |
| 22 { | |
| 23 if (tolerance > 255) { | |
| 24 tolerance = 255; | |
| 25 } | |
| 26 | |
| 27 fOpColor = opColor; | |
| 28 fDistMul = (256 << 14) / (tolerance + 1); | |
| 29 fMode = mode; | |
| 30 } | |
| 31 | |
| 32 SkAvoidXfermode::SkAvoidXfermode(SkFlattenableReadBuffer& buffer) | |
| 33 : INHERITED(buffer) | |
| 34 { | |
| 35 fOpColor = buffer.readU32(); | |
| 36 fDistMul = buffer.readU32(); | |
| 37 fMode = (Mode)buffer.readU8(); | |
| 38 } | |
| 39 | |
| 40 void SkAvoidXfermode::flatten(SkFlattenableWriteBuffer& buffer) | |
| 41 { | |
| 42 this->INHERITED::flatten(buffer); | |
| 43 | |
| 44 buffer.write32(fOpColor); | |
| 45 buffer.write32(fDistMul); | |
| 46 buffer.write8(fMode); | |
| 47 } | |
| 48 | |
| 49 SkFlattenable* SkAvoidXfermode::Create(SkFlattenableReadBuffer& rb) | |
| 50 { | |
| 51 return SkNEW_ARGS(SkAvoidXfermode, (rb)); | |
| 52 } | |
| 53 | |
| 54 SkFlattenable::Factory SkAvoidXfermode::getFactory() | |
| 55 { | |
| 56 return Create; | |
| 57 } | |
| 58 | |
| 59 // returns 0..31 | |
| 60 static unsigned color_dist16(uint16_t c, unsigned r, unsigned g, unsigned b) | |
| 61 { | |
| 62 SkASSERT(r <= SK_R16_MASK); | |
| 63 SkASSERT(g <= SK_G16_MASK); | |
| 64 SkASSERT(b <= SK_B16_MASK); | |
| 65 | |
| 66 unsigned dr = SkAbs32(SkGetPackedR16(c) - r); | |
| 67 unsigned dg = SkAbs32(SkGetPackedG16(c) - g) >> (SK_G16_BITS - SK_R16_BITS); | |
| 68 unsigned db = SkAbs32(SkGetPackedB16(c) - b); | |
| 69 | |
| 70 return SkMax32(dr, SkMax32(dg, db)); | |
| 71 } | |
| 72 | |
| 73 // returns 0..15 | |
| 74 static unsigned color_dist4444(uint16_t c, unsigned r, unsigned g, unsigned b) | |
| 75 { | |
| 76 SkASSERT(r <= 0xF); | |
| 77 SkASSERT(g <= 0xF); | |
| 78 SkASSERT(b <= 0xF); | |
| 79 | |
| 80 unsigned dr = SkAbs32(SkGetPackedR4444(c) - r); | |
| 81 unsigned dg = SkAbs32(SkGetPackedG4444(c) - g); | |
| 82 unsigned db = SkAbs32(SkGetPackedB4444(c) - b); | |
| 83 | |
| 84 return SkMax32(dr, SkMax32(dg, db)); | |
| 85 } | |
| 86 | |
| 87 // returns 0..255 | |
| 88 static unsigned color_dist32(SkPMColor c, U8CPU r, U8CPU g, U8CPU b) | |
| 89 { | |
| 90 SkASSERT(r <= 0xFF); | |
| 91 SkASSERT(g <= 0xFF); | |
| 92 SkASSERT(b <= 0xFF); | |
| 93 | |
| 94 unsigned dr = SkAbs32(SkGetPackedR32(c) - r); | |
| 95 unsigned dg = SkAbs32(SkGetPackedG32(c) - g); | |
| 96 unsigned db = SkAbs32(SkGetPackedB32(c) - b); | |
| 97 | |
| 98 return SkMax32(dr, SkMax32(dg, db)); | |
| 99 } | |
| 100 | |
| 101 static int scale_dist_14(int dist, uint32_t mul, uint32_t sub) | |
| 102 { | |
| 103 int tmp = dist * mul - sub; | |
| 104 int result = (tmp + (1 << 13)) >> 14; | |
| 105 | |
| 106 return result; | |
| 107 } | |
| 108 | |
| 109 static SkPMColor SkFourByteInterp(SkPMColor src, SkPMColor dst, unsigned scale) | |
| 110 { | |
| 111 unsigned a = SkAlphaBlend(SkGetPackedA32(src), SkGetPackedA32(dst), scale); | |
| 112 unsigned r = SkAlphaBlend(SkGetPackedR32(src), SkGetPackedR32(dst), scale); | |
| 113 unsigned g = SkAlphaBlend(SkGetPackedG32(src), SkGetPackedG32(dst), scale); | |
| 114 unsigned b = SkAlphaBlend(SkGetPackedB32(src), SkGetPackedB32(dst), scale); | |
| 115 | |
| 116 return SkPackARGB32(a, r, g, b); | |
| 117 } | |
| 118 | |
| 119 void SkAvoidXfermode::xfer32(SkPMColor dst[], const SkPMColor src[], int count, | |
| 120 const SkAlpha aa[]) | |
| 121 { | |
| 122 unsigned opR = SkColorGetR(fOpColor); | |
| 123 unsigned opG = SkColorGetG(fOpColor); | |
| 124 unsigned opB = SkColorGetB(fOpColor); | |
| 125 uint32_t mul = fDistMul; | |
| 126 uint32_t sub = (fDistMul - (1 << 14)) << 8; | |
| 127 | |
| 128 int MAX, mask; | |
| 129 | |
| 130 if (kTargetColor_Mode == fMode) { | |
| 131 mask = -1; | |
| 132 MAX = 255; | |
| 133 } else { | |
| 134 mask = 0; | |
| 135 MAX = 0; | |
| 136 } | |
| 137 | |
| 138 for (int i = 0; i < count; i++) { | |
| 139 int d = color_dist32(dst[i], opR, opG, opB); | |
| 140 // now reverse d if we need to | |
| 141 d = MAX + (d ^ mask) - mask; | |
| 142 SkASSERT((unsigned)d <= 255); | |
| 143 d = SkAlpha255To256(d); | |
| 144 | |
| 145 d = scale_dist_14(d, mul, sub); | |
| 146 SkASSERT(d <= 256); | |
| 147 | |
| 148 if (d > 0) { | |
| 149 if (NULL != aa) { | |
| 150 d = SkAlphaMul(d, SkAlpha255To256(*aa++)); | |
| 151 if (0 == d) { | |
| 152 continue; | |
| 153 } | |
| 154 } | |
| 155 dst[i] = SkFourByteInterp(src[i], dst[i], d); | |
| 156 } | |
| 157 } | |
| 158 } | |
| 159 | |
| 160 static inline U16CPU SkBlend3216(SkPMColor src, U16CPU dst, unsigned scale) | |
| 161 { | |
| 162 SkASSERT(scale <= 32); | |
| 163 scale <<= 3; | |
| 164 | |
| 165 return SkPackRGB16( SkAlphaBlend(SkPacked32ToR16(src), SkGetPackedR16(dst),
scale), | |
| 166 SkAlphaBlend(SkPacked32ToG16(src), SkGetPackedG16(dst),
scale), | |
| 167 SkAlphaBlend(SkPacked32ToB16(src), SkGetPackedB16(dst),
scale)); | |
| 168 } | |
| 169 | |
| 170 void SkAvoidXfermode::xfer16(uint16_t dst[], const SkPMColor src[], int count, | |
| 171 const SkAlpha aa[]) | |
| 172 { | |
| 173 unsigned opR = SkColorGetR(fOpColor) >> (8 - SK_R16_BITS); | |
| 174 unsigned opG = SkColorGetG(fOpColor) >> (8 - SK_G16_BITS); | |
| 175 unsigned opB = SkColorGetB(fOpColor) >> (8 - SK_R16_BITS); | |
| 176 uint32_t mul = fDistMul; | |
| 177 uint32_t sub = (fDistMul - (1 << 14)) << 8; | |
| 178 | |
| 179 int MAX, mask; | |
| 180 | |
| 181 if (kTargetColor_Mode == fMode) { | |
| 182 mask = -1; | |
| 183 MAX = 31; | |
| 184 } else { | |
| 185 mask = 0; | |
| 186 MAX = 0; | |
| 187 } | |
| 188 | |
| 189 for (int i = 0; i < count; i++) { | |
| 190 int d = color_dist16(dst[i], opR, opG, opB); | |
| 191 // now reverse d if we need to | |
| 192 d = MAX + (d ^ mask) - mask; | |
| 193 SkASSERT((unsigned)d <= 31); | |
| 194 // convert from 0..31 to 0..32 | |
| 195 d += d >> 4; | |
| 196 | |
| 197 d = scale_dist_14(d, mul, sub); | |
| 198 SkASSERT(d <= 32); | |
| 199 | |
| 200 if (d > 0) { | |
| 201 if (NULL != aa) { | |
| 202 d = SkAlphaMul(d, SkAlpha255To256(*aa++)); | |
| 203 if (0 == d) { | |
| 204 continue; | |
| 205 } | |
| 206 } | |
| 207 dst[i] = SkBlend3216(src[i], dst[i], d); | |
| 208 } | |
| 209 } | |
| 210 } | |
| 211 | |
| 212 void SkAvoidXfermode::xfer4444(uint16_t dst[], const SkPMColor src[], int count, | |
| 213 const SkAlpha aa[]) | |
| 214 { | |
| 215 unsigned opR = SkColorGetR(fOpColor) >> 4; | |
| 216 unsigned opG = SkColorGetG(fOpColor) >> 4; | |
| 217 unsigned opB = SkColorGetB(fOpColor) >> 4; | |
| 218 uint32_t mul = fDistMul; | |
| 219 uint32_t sub = (fDistMul - (1 << 14)) << 8; | |
| 220 | |
| 221 int MAX, mask; | |
| 222 | |
| 223 if (kTargetColor_Mode == fMode) { | |
| 224 mask = -1; | |
| 225 MAX = 15; | |
| 226 } else { | |
| 227 mask = 0; | |
| 228 MAX = 0; | |
| 229 } | |
| 230 | |
| 231 for (int i = 0; i < count; i++) { | |
| 232 int d = color_dist4444(dst[i], opR, opG, opB); | |
| 233 // now reverse d if we need to | |
| 234 d = MAX + (d ^ mask) - mask; | |
| 235 SkASSERT((unsigned)d <= 15); | |
| 236 d = SkAlpha255To256(d); | |
| 237 | |
| 238 d = scale_dist_14(d, mul, sub); | |
| 239 SkASSERT(d <= 16); | |
| 240 | |
| 241 if (d > 0) { | |
| 242 if (NULL != aa) { | |
| 243 d = SkAlphaMul(d, SkAlpha255To256(*aa++)); | |
| 244 if (0 == d) { | |
| 245 continue; | |
| 246 } | |
| 247 } | |
| 248 dst[i] = SkBlend4444(SkPixel32ToPixel4444(src[i]), dst[i], d); | |
| 249 } | |
| 250 } | |
| 251 } | |
| 252 | |
| 253 void SkAvoidXfermode::xferA8(SkAlpha dst[], const SkPMColor src[], int count, co
nst SkAlpha aa[]) | |
| 254 { | |
| 255 // override in subclass | |
| 256 } | |
| 257 | |
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Chromium Code Reviews
Issue 113827:
Remove the remainder of the skia source code from the Chromium repo.... (Closed)
Base URL: svn://chrome-svn/chrome/trunk/src/