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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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53 // There's no chance of underflow, and if we subtract m before adding s+d, n
o overflow. | 53 // There's no chance of underflow, and if we subtract m before adding s+d, n
o overflow. |
54 return (s - m) + (d - m.zeroAlphas()); | 54 return (s - m) + (d - m.zeroAlphas()); |
55 } | 55 } |
56 // [ Sa + Da - Sa*Da, Sc + Dc - 2*Sc*Dc ] | 56 // [ Sa + Da - Sa*Da, Sc + Dc - 2*Sc*Dc ] |
57 XFERMODE(Exclusion) { | 57 XFERMODE(Exclusion) { |
58 auto p = s.approxMulDiv255(d); | 58 auto p = s.approxMulDiv255(d); |
59 // There's no chance of underflow, and if we subtract p before adding src+ds
t, no overflow. | 59 // There's no chance of underflow, and if we subtract p before adding src+ds
t, no overflow. |
60 return (s - p) + (d - p.zeroAlphas()); | 60 return (s - p) + (d - p.zeroAlphas()); |
61 } | 61 } |
62 | 62 |
63 XFERMODE(HardLight) { | |
64 auto alphas = SrcOver::Xfer(s,d); | |
65 | |
66 auto sa = s.alphas(), | |
67 da = d.alphas(); | |
68 | |
69 auto isDark = s < (sa-s); | |
70 | |
71 auto dark = s*d << 1, | |
72 lite = sa*da - ((da-d)*(sa-s) << 1), | |
73 both = s*da.inv() + d*sa.inv(); | |
74 | |
75 // TODO: do isDark in 16-bit so we only have to div255() once. | |
76 auto colors = isDark.thenElse((dark + both).div255(), | |
77 (lite + both).div255()); | |
78 return alphas.zeroColors() + colors.zeroAlphas(); | |
79 } | |
80 XFERMODE(Overlay) { return HardLight::Xfer(d,s); } | |
81 | |
82 XFERMODE(Darken) { | |
83 auto sda = s.approxMulDiv255(d.alphas()), | |
84 dsa = d.approxMulDiv255(s.alphas()); | |
85 auto srcover = s + (d - dsa), | |
86 dstover = d + (s - sda); | |
87 auto alphas = srcover, | |
88 colors = (sda < dsa).thenElse(srcover, dstover); | |
89 return alphas.zeroColors() + colors.zeroAlphas(); | |
90 } | |
91 XFERMODE(Lighten) { | |
92 auto sda = s.approxMulDiv255(d.alphas()), | |
93 dsa = d.approxMulDiv255(s.alphas()); | |
94 auto srcover = s + (d - dsa), | |
95 dstover = d + (s - sda); | |
96 auto alphas = srcover, | |
97 colors = (sda < dsa).thenElse(dstover, srcover); | |
98 return alphas.zeroColors() + colors.zeroAlphas(); | |
99 } | |
100 | |
101 #undef XFERMODE | 63 #undef XFERMODE |
102 | 64 |
103 // A reasonable fallback mode for doing AA is to simply apply the transfermode f
irst, | 65 // A reasonable fallback mode for doing AA is to simply apply the transfermode f
irst, |
104 // then linearly interpolate the AA. | 66 // then linearly interpolate the AA. |
105 template <typename Mode> | 67 template <typename Mode> |
106 static Sk4px xfer_aa(const Sk4px& s, const Sk4px& d, const Sk4px& aa) { | 68 static Sk4px xfer_aa(const Sk4px& s, const Sk4px& d, const Sk4px& aa) { |
107 Sk4px bw = Mode::Xfer(s, d); | 69 Sk4px bw = Mode::Xfer(s, d); |
108 return (bw * aa + d * aa.inv()).div255(); | 70 return (bw * aa + d * aa.inv()).div255(); |
109 } | 71 } |
110 | 72 |
111 // For some transfermodes we specialize AA, either for correctness or performanc
e. | 73 // For some transfermodes we specialize AA, either for correctness or performanc
e. |
112 #define XFERMODE_AA(Name) \ | 74 #ifndef SK_NO_SPECIALIZED_AA_XFERMODES |
113 template <> Sk4px xfer_aa<Name>(const Sk4px& s, const Sk4px& d, const Sk4px&
aa) | 75 #define XFERMODE_AA(Name) \ |
| 76 template <> Sk4px xfer_aa<Name>(const Sk4px& s, const Sk4px& d, const Sk
4px& aa) |
114 | 77 |
115 // Plus' clamp needs to happen after AA. skia:3852 | 78 // Plus' clamp needs to happen after AA. skia:3852 |
116 XFERMODE_AA(Plus) { // [ clamp( (1-AA)D + (AA)(S+D) ) == clamp(D + AA*S) ] | 79 XFERMODE_AA(Plus) { // [ clamp( (1-AA)D + (AA)(S+D) ) == clamp(D + AA*S) ] |
117 return d.saturatedAdd(s.approxMulDiv255(aa)); | 80 return d.saturatedAdd(s.approxMulDiv255(aa)); |
118 } | 81 } |
119 | 82 |
120 #undef XFERMODE_AA | 83 #undef XFERMODE_AA |
| 84 #endif |
121 | 85 |
122 template <typename ProcType> | 86 template <typename ProcType> |
123 class SkT4pxXfermode : public SkProcCoeffXfermode { | 87 class SkT4pxXfermode : public SkProcCoeffXfermode { |
124 public: | 88 public: |
125 static SkProcCoeffXfermode* Create(const ProcCoeff& rec) { | 89 static SkProcCoeffXfermode* Create(const ProcCoeff& rec) { |
126 return SkNEW_ARGS(SkT4pxXfermode, (rec)); | 90 return SkNEW_ARGS(SkT4pxXfermode, (rec)); |
127 } | 91 } |
128 | 92 |
129 void xfer32(SkPMColor dst[], const SkPMColor src[], int n, const SkAlpha aa[
]) const override { | 93 void xfer32(SkPMColor dst[], const SkPMColor src[], int n, const SkAlpha aa[
]) const override { |
130 if (NULL == aa) { | 94 if (NULL == aa) { |
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159 case SkXfermode::kDstOut_Mode: return SkT4pxXfermode<DstOut>::Create
(rec); | 123 case SkXfermode::kDstOut_Mode: return SkT4pxXfermode<DstOut>::Create
(rec); |
160 case SkXfermode::kSrcATop_Mode: return SkT4pxXfermode<SrcATop>::Creat
e(rec); | 124 case SkXfermode::kSrcATop_Mode: return SkT4pxXfermode<SrcATop>::Creat
e(rec); |
161 case SkXfermode::kDstATop_Mode: return SkT4pxXfermode<DstATop>::Creat
e(rec); | 125 case SkXfermode::kDstATop_Mode: return SkT4pxXfermode<DstATop>::Creat
e(rec); |
162 case SkXfermode::kXor_Mode: return SkT4pxXfermode<Xor>::Create(re
c); | 126 case SkXfermode::kXor_Mode: return SkT4pxXfermode<Xor>::Create(re
c); |
163 case SkXfermode::kPlus_Mode: return SkT4pxXfermode<Plus>::Create(r
ec); | 127 case SkXfermode::kPlus_Mode: return SkT4pxXfermode<Plus>::Create(r
ec); |
164 case SkXfermode::kModulate_Mode: return SkT4pxXfermode<Modulate>::Crea
te(rec); | 128 case SkXfermode::kModulate_Mode: return SkT4pxXfermode<Modulate>::Crea
te(rec); |
165 case SkXfermode::kScreen_Mode: return SkT4pxXfermode<Screen>::Create
(rec); | 129 case SkXfermode::kScreen_Mode: return SkT4pxXfermode<Screen>::Create
(rec); |
166 case SkXfermode::kMultiply_Mode: return SkT4pxXfermode<Multiply>::Crea
te(rec); | 130 case SkXfermode::kMultiply_Mode: return SkT4pxXfermode<Multiply>::Crea
te(rec); |
167 case SkXfermode::kDifference_Mode: return SkT4pxXfermode<Difference>::Cr
eate(rec); | 131 case SkXfermode::kDifference_Mode: return SkT4pxXfermode<Difference>::Cr
eate(rec); |
168 case SkXfermode::kExclusion_Mode: return SkT4pxXfermode<Exclusion>::Cre
ate(rec); | 132 case SkXfermode::kExclusion_Mode: return SkT4pxXfermode<Exclusion>::Cre
ate(rec); |
169 #if !defined(SK_SUPPORT_LEGACY_XFERMODES) // For staging in Chrome (layout test
s). | |
170 case SkXfermode::kHardLight_Mode: return SkT4pxXfermode<HardLight>::Cre
ate(rec); | |
171 case SkXfermode::kOverlay_Mode: return SkT4pxXfermode<Overlay>::Creat
e(rec); | |
172 case SkXfermode::kDarken_Mode: return SkT4pxXfermode<Darken>::Create
(rec); | |
173 case SkXfermode::kLighten_Mode: return SkT4pxXfermode<Lighten>::Creat
e(rec); | |
174 #endif | |
175 default: break; | 133 default: break; |
176 } | 134 } |
177 #endif | 135 #endif |
178 return nullptr; | 136 return nullptr; |
179 } | 137 } |
180 | 138 |
181 } // namespace | 139 } // namespace |
182 | 140 |
183 #endif//Sk4pxXfermode_DEFINED | 141 #endif//Sk4pxXfermode_DEFINED |
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