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 #include "SkPM4f.h" 9 #include "SkColorPriv.h" 10 #include "SkNx.h" 11 12 static inline float get_alpha(const Sk4f& f4) { 13 return f4[SkPM4f::A]; 14 } 15 16 static inline Sk4f set_alpha(const Sk4f& f4, float alpha) { 17 static_assert(3 == SkPM4f::A, ""); 18 return Sk4f(f4[0], f4[1], f4[2], alpha); 19 } 20 21 static inline uint32_t to_4b(const Sk4f& f4) { 22 uint32_t b4; 23 SkNx_cast<uint8_t>(f4).store((uint8_t*)&b4); 24 return b4; 25 } 26 27 static inline Sk4f to_4f(uint32_t b4) { 28 return SkNx_cast<float>(Sk4b::Load((const uint8_t*)&b4)); 29 } 30 31 static inline Sk4f srgb_to_linear(const Sk4f& s4) { 32 return set_alpha(s4 * s4, get_alpha(s4)); 33 } 34 35 static inline Sk4f linear_to_srgb(const Sk4f& l4) { 36 return set_alpha(l4.sqrt(), get_alpha(l4)); 37 } 38 39 /////////////////////////////////////////////////////////////////////////////////////////////////// 40 41 static inline Sk4f Sk4f_fromL32(uint32_t src) { 42 return to_4f(src) * Sk4f(1.0f/255); 43 } 44 45 static inline Sk4f Sk4f_fromS32(uint32_t src) { 46 return srgb_to_linear(to_4f(src) * Sk4f(1.0f/255)); 47 } 48 49 static inline uint32_t Sk4f_toL32(const Sk4f& x4) { 50 return to_4b(x4 * Sk4f(255) + Sk4f(0.5f)); 51 } 52 53 static inline uint32_t Sk4f_toS32(const Sk4f& x4) { 54 return to_4b(linear_to_srgb(x4) * Sk4f(255) + Sk4f(0.5f)); 55 } 56
