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1 /* | 1 /* |
2 * Copyright 2015 Google Inc. | 2 * Copyright 2015 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #ifndef Sk4pxXfermode_DEFINED | 8 #ifndef Sk4pxXfermode_DEFINED |
9 #define Sk4pxXfermode_DEFINED | 9 #define Sk4pxXfermode_DEFINED |
10 | 10 |
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61 // There's no chance of underflow, and if we subtract p before adding src+ds
t, no overflow. | 61 // There's no chance of underflow, and if we subtract p before adding src+ds
t, no overflow. |
62 return (s - p) + (d - p.zeroAlphas()); | 62 return (s - p) + (d - p.zeroAlphas()); |
63 } | 63 } |
64 | 64 |
65 XFERMODE(HardLight) { | 65 XFERMODE(HardLight) { |
66 auto alphas = SrcOver::Xfer(s,d); | 66 auto alphas = SrcOver::Xfer(s,d); |
67 | 67 |
68 auto sa = s.alphas(), | 68 auto sa = s.alphas(), |
69 da = d.alphas(); | 69 da = d.alphas(); |
70 | 70 |
71 auto isDark = s < (sa-s); | 71 auto isLite = (sa-s) < s; |
72 | 72 |
73 auto dark = s*d << 1, | 73 auto dark = s*d << 1, |
74 lite = sa*da - ((da-d)*(sa-s) << 1), | 74 lite = sa*da - ((da-d)*(sa-s) << 1), |
75 both = s*da.inv() + d*sa.inv(); | 75 both = s*da.inv() + d*sa.inv(); |
76 | 76 |
77 // TODO: do isDark in 16-bit so we only have to div255() once. | 77 // TODO: do isLite in 16-bit so we only have to div255() once. |
78 auto colors = isDark.thenElse((dark + both).div255(), | 78 auto colors = isLite.thenElse((lite + both).div255(), |
79 (lite + both).div255()); | 79 (dark + both).div255()); |
80 return alphas.zeroColors() + colors.zeroAlphas(); | 80 return alphas.zeroColors() + colors.zeroAlphas(); |
81 } | 81 } |
82 XFERMODE(Overlay) { return HardLight::Xfer(d,s); } | 82 XFERMODE(Overlay) { return HardLight::Xfer(d,s); } |
83 | 83 |
84 XFERMODE(Darken) { | 84 XFERMODE(Darken) { |
85 auto sda = s.approxMulDiv255(d.alphas()), | 85 auto sda = s.approxMulDiv255(d.alphas()), |
86 dsa = d.approxMulDiv255(s.alphas()); | 86 dsa = d.approxMulDiv255(s.alphas()); |
87 auto srcover = s + (d - dsa), | 87 auto srcover = s + (d - dsa), |
88 dstover = d + (s - sda); | 88 dstover = d + (s - sda); |
89 auto alphas = srcover, | 89 auto alphas = srcover, |
90 colors = (sda < dsa).thenElse(srcover, dstover); | 90 colors = (sda < dsa).thenElse(srcover, dstover); |
91 return alphas.zeroColors() + colors.zeroAlphas(); | 91 return alphas.zeroColors() + colors.zeroAlphas(); |
92 } | 92 } |
93 XFERMODE(Lighten) { | 93 XFERMODE(Lighten) { |
94 auto sda = s.approxMulDiv255(d.alphas()), | 94 auto sda = s.approxMulDiv255(d.alphas()), |
95 dsa = d.approxMulDiv255(s.alphas()); | 95 dsa = d.approxMulDiv255(s.alphas()); |
96 auto srcover = s + (d - dsa), | 96 auto srcover = s + (d - dsa), |
97 dstover = d + (s - sda); | 97 dstover = d + (s - sda); |
98 auto alphas = srcover, | 98 auto alphas = srcover, |
99 colors = (sda < dsa).thenElse(dstover, srcover); | 99 colors = (dsa < sda).thenElse(srcover, dstover); |
100 return alphas.zeroColors() + colors.zeroAlphas(); | 100 return alphas.zeroColors() + colors.zeroAlphas(); |
101 } | 101 } |
102 #undef XFERMODE | 102 #undef XFERMODE |
103 | 103 |
104 // Some xfermodes use math like divide or sqrt that's best done in floats 1 pixe
l at a time. | 104 // Some xfermodes use math like divide or sqrt that's best done in floats 1 pixe
l at a time. |
105 #define XFERMODE(Name) \ | 105 #define XFERMODE(Name) \ |
106 struct Name { \ | 106 struct Name { \ |
107 static SkPMFloat Xfer(const SkPMFloat&, const SkPMFloat&); \ | 107 static SkPMFloat Xfer(const SkPMFloat&, const SkPMFloat&); \ |
108 static const SkXfermode::Mode kMode = SkXfermode::k##Name##_Mode; \ | 108 static const SkXfermode::Mode kMode = SkXfermode::k##Name##_Mode; \ |
109 }; \ | 109 }; \ |
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247 #endif | 247 #endif |
248 default: break; | 248 default: break; |
249 } | 249 } |
250 #endif | 250 #endif |
251 return nullptr; | 251 return nullptr; |
252 } | 252 } |
253 | 253 |
254 } // namespace | 254 } // namespace |
255 | 255 |
256 #endif//Sk4pxXfermode_DEFINED | 256 #endif//Sk4pxXfermode_DEFINED |
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