reed | fbc1e29 | 2016-01-29 05:22:59 -0800 | [diff] [blame] | 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 | |
reed | dd9ffea | 2016-02-18 12:39:14 -0800 | [diff] [blame] | 8 | #include "SkPM4f.h" |
reed | fbc1e29 | 2016-01-29 05:22:59 -0800 | [diff] [blame] | 9 | #include "SkColorPriv.h" |
| 10 | #include "SkNx.h" |
| 11 | |
| 12 | static inline float get_alpha(const Sk4f& f4) { |
| 13 | return f4.kth<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.kth<0>(), f4.kth<1>(), f4.kth<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 | |
reed | 395eabe | 2016-01-30 18:52:31 -0800 | [diff] [blame] | 31 | static inline Sk4f srgb_to_linear(const Sk4f& s4) { |
reed | fbc1e29 | 2016-01-29 05:22:59 -0800 | [diff] [blame] | 32 | return set_alpha(s4 * s4, get_alpha(s4)); |
| 33 | } |
| 34 | |
reed | 395eabe | 2016-01-30 18:52:31 -0800 | [diff] [blame] | 35 | static inline Sk4f linear_to_srgb(const Sk4f& l4) { |
| 36 | return set_alpha(l4.sqrt(), get_alpha(l4)); |
reed | fbc1e29 | 2016-01-29 05:22:59 -0800 | [diff] [blame] | 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) { |
reed | 395eabe | 2016-01-30 18:52:31 -0800 | [diff] [blame] | 46 | return srgb_to_linear(to_4f(src) * Sk4f(1.0f/255)); |
reed | fbc1e29 | 2016-01-29 05:22:59 -0800 | [diff] [blame] | 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) { |
reed | 395eabe | 2016-01-30 18:52:31 -0800 | [diff] [blame] | 54 | return to_4b(linear_to_srgb(x4) * Sk4f(255) + Sk4f(0.5f)); |
reed | fbc1e29 | 2016-01-29 05:22:59 -0800 | [diff] [blame] | 55 | } |