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| 1 /* |
| 2 * Copyright 2016 Google Inc. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license that can be |
| 5 * found in the LICENSE file. |
| 6 */ |
| 7 |
| 8 #ifndef Sk4fGradientPriv_DEFINED |
| 9 #define Sk4fGradientPriv_DEFINED |
| 10 |
| 11 #include "SkColor.h" |
| 12 #include "SkNx.h" |
| 13 #include "SkPM4f.h" |
| 14 |
| 15 // Templates shared by various 4f gradient flavors. |
| 16 |
| 17 namespace { |
| 18 |
| 19 inline Sk4f premul_4f(const Sk4f& c) { |
| 20 const float alpha = c[SkPM4f::A]; |
| 21 // FIXME: portable swizzle? |
| 22 return c * Sk4f(alpha, alpha, alpha, 1); |
| 23 } |
| 24 |
| 25 template <bool do_premul> |
| 26 inline SkPMColor trunc_from_255(const Sk4f& c) { |
| 27 SkPMColor pmc; |
| 28 SkNx_cast<uint8_t>(c).store(&pmc); |
| 29 if (do_premul) { |
| 30 pmc = SkPreMultiplyARGB(SkGetPackedA32(pmc), SkGetPackedR32(pmc), |
| 31 SkGetPackedG32(pmc), SkGetPackedB32(pmc)); |
| 32 } |
| 33 return pmc; |
| 34 } |
| 35 |
| 36 template<typename DstType, bool do_premul> |
| 37 void store(const Sk4f& color, DstType* dst); |
| 38 |
| 39 template<> |
| 40 inline void store<SkPM4f, false>(const Sk4f& c, SkPM4f* dst) { |
| 41 c.store(dst); |
| 42 } |
| 43 |
| 44 template<> |
| 45 inline void store<SkPM4f, true>(const Sk4f& c, SkPM4f* dst) { |
| 46 store<SkPM4f, false>(premul_4f(c), dst); |
| 47 } |
| 48 |
| 49 template<> |
| 50 inline void store<SkPMColor, false>(const Sk4f& c, SkPMColor* dst) { |
| 51 *dst = trunc_from_255<false>(c); |
| 52 } |
| 53 |
| 54 template<> |
| 55 inline void store<SkPMColor, true>(const Sk4f& c, SkPMColor* dst) { |
| 56 *dst = trunc_from_255<true>(c); |
| 57 } |
| 58 |
| 59 template<typename DstType, bool do_premul> |
| 60 inline void store4x(const Sk4f& c0, |
| 61 const Sk4f& c1, |
| 62 const Sk4f& c2, |
| 63 const Sk4f& c3, |
| 64 DstType* dst) { |
| 65 store<DstType, do_premul>(c0, dst++); |
| 66 store<DstType, do_premul>(c1, dst++); |
| 67 store<DstType, do_premul>(c2, dst++); |
| 68 store<DstType, do_premul>(c3, dst++); |
| 69 } |
| 70 |
| 71 template<> |
| 72 inline void store4x<SkPMColor, false>(const Sk4f& c0, |
| 73 const Sk4f& c1, |
| 74 const Sk4f& c2, |
| 75 const Sk4f& c3, |
| 76 SkPMColor* dst) { |
| 77 Sk4f_ToBytes((uint8_t*)dst, c0, c1, c2, c3); |
| 78 } |
| 79 |
| 80 template<typename DstType> |
| 81 float dst_component_scale(); |
| 82 |
| 83 template<> |
| 84 inline float dst_component_scale<SkPM4f>() { |
| 85 return 1; |
| 86 } |
| 87 |
| 88 template<> |
| 89 inline float dst_component_scale<SkPMColor>() { |
| 90 return 255; |
| 91 } |
| 92 |
| 93 template<typename DstType> |
| 94 Sk4f dst_swizzle(const SkPM4f&); |
| 95 |
| 96 template<> |
| 97 inline Sk4f dst_swizzle<SkPM4f>(const SkPM4f& c) { |
| 98 return c.to4f(); |
| 99 } |
| 100 |
| 101 template<> |
| 102 inline Sk4f dst_swizzle<SkPMColor>(const SkPM4f& c) { |
| 103 return c.to4f_pmorder(); |
| 104 } |
| 105 |
| 106 } |
| 107 |
| 108 #endif // Sk4fGradientPriv_DEFINED |
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