| /* |
| * Copyright 2016 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef SkPM4fPriv_DEFINED |
| #define SkPM4fPriv_DEFINED |
| |
| #include "SkColorPriv.h" |
| #include "SkColorSpace.h" |
| #include "SkPM4f.h" |
| #include "SkSRGB.h" |
| |
| static inline Sk4f set_alpha(const Sk4f& px, float alpha) { |
| return { px[0], px[1], px[2], alpha }; |
| } |
| |
| static inline float get_alpha(const Sk4f& px) { |
| return px[3]; |
| } |
| |
| |
| static inline Sk4f Sk4f_fromL32(uint32_t px) { |
| return SkNx_cast<float>(Sk4b::Load(&px)) * (1/255.0f); |
| } |
| |
| static inline Sk4f Sk4f_fromS32(uint32_t px) { |
| return { sk_linear_from_srgb[(px >> 0) & 0xff], |
| sk_linear_from_srgb[(px >> 8) & 0xff], |
| sk_linear_from_srgb[(px >> 16) & 0xff], |
| (1/255.0f) * (px >> 24) }; |
| } |
| |
| static inline uint32_t Sk4f_toL32(const Sk4f& px) { |
| uint32_t l32; |
| SkNx_cast<uint8_t>(Sk4f_round(px * 255.0f)).store(&l32); |
| return l32; |
| } |
| |
| static inline uint32_t Sk4f_toS32(const Sk4f& px) { |
| Sk4i rgb = sk_linear_to_srgb(px), |
| srgb = { rgb[0], rgb[1], rgb[2], (int)(255.0f * px[3] + 0.5f) }; |
| |
| uint32_t s32; |
| SkNx_cast<uint8_t>(srgb).store(&s32); |
| return s32; |
| } |
| |
| |
| // SkColor handling: |
| // SkColor has an ordering of (b, g, r, a) if cast to an Sk4f, so the code swizzles r and b to |
| // produce the needed (r, g, b, a) ordering. |
| static inline Sk4f Sk4f_from_SkColor(SkColor color) { |
| return swizzle_rb(Sk4f_fromS32(color)); |
| } |
| |
| static inline void assert_unit(float x) { |
| SkASSERT(0 <= x && x <= 1); |
| } |
| |
| static inline float exact_srgb_to_linear(float srgb) { |
| assert_unit(srgb); |
| float linear; |
| if (srgb <= 0.04045) { |
| linear = srgb / 12.92f; |
| } else { |
| linear = powf((srgb + 0.055f) / 1.055f, 2.4f); |
| } |
| assert_unit(linear); |
| return linear; |
| } |
| |
| static inline SkPM4f SkPM4f_from_SkColor(SkColor color, SkColorSpace* dst) { |
| SkColor4f color4f; |
| if (dst) { |
| // sRGB gamma, sRGB gamut. |
| color4f = SkColor4f::FromColor(color); |
| // TODO: gamut transform if needed |
| } else { |
| // Linear gamma, dst gamut. |
| swizzle_rb(SkNx_cast<float>(Sk4b::Load(&color)) * (1/255.0f)).store(&color4f); |
| } |
| return color4f.premul(); |
| } |
| |
| #endif |