bsalomon | cdee009 | 2016-01-08 13:20:12 -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 | |
| 8 | #ifndef GrSwizzle_DEFINED |
| 9 | #define GrSwizzle_DEFINED |
| 10 | |
Greg Daniel | 369ee6b | 2019-12-02 15:30:02 -0500 | [diff] [blame] | 11 | #include "include/core/SkString.h" |
Mike Klein | c0bd9f9 | 2019-04-23 12:05:21 -0500 | [diff] [blame] | 12 | #include "include/private/SkColorData.h" |
Greg Daniel | f91aeb2 | 2019-06-18 09:58:02 -0400 | [diff] [blame] | 13 | #include "src/gpu/GrColor.h" |
bsalomon | cdee009 | 2016-01-08 13:20:12 -0800 | [diff] [blame] | 14 | |
Brian Salomon | 217522c | 2019-06-11 15:55:30 -0400 | [diff] [blame] | 15 | class SkRasterPipeline; |
| 16 | |
| 17 | /** Represents a rgba swizzle. It can be converted either into a string or a eight bit int. */ |
bsalomon | cdee009 | 2016-01-08 13:20:12 -0800 | [diff] [blame] | 18 | class GrSwizzle { |
| 19 | public: |
Brian Salomon | 2151165 | 2018-10-17 08:30:51 -0400 | [diff] [blame] | 20 | constexpr GrSwizzle() : GrSwizzle("rgba") {} |
Brian Salomon | 217522c | 2019-06-11 15:55:30 -0400 | [diff] [blame] | 21 | explicit constexpr GrSwizzle(const char c[4]); |
bsalomon | cdee009 | 2016-01-08 13:20:12 -0800 | [diff] [blame] | 22 | |
Brian Salomon | 217522c | 2019-06-11 15:55:30 -0400 | [diff] [blame] | 23 | constexpr GrSwizzle(const GrSwizzle&); |
| 24 | constexpr GrSwizzle& operator=(const GrSwizzle& that); |
bsalomon | cdee009 | 2016-01-08 13:20:12 -0800 | [diff] [blame] | 25 | |
Brian Salomon | f30b1c1 | 2019-06-20 12:25:02 -0400 | [diff] [blame] | 26 | static constexpr GrSwizzle Concat(const GrSwizzle& a, const GrSwizzle& b); |
| 27 | |
Brian Salomon | 2151165 | 2018-10-17 08:30:51 -0400 | [diff] [blame] | 28 | constexpr bool operator==(const GrSwizzle& that) const { return fKey == that.fKey; } |
| 29 | constexpr bool operator!=(const GrSwizzle& that) const { return !(*this == that); } |
bsalomon | cdee009 | 2016-01-08 13:20:12 -0800 | [diff] [blame] | 30 | |
| 31 | /** Compact representation of the swizzle suitable for a key. */ |
Greg Daniel | f259b8b | 2019-02-14 09:03:43 -0500 | [diff] [blame] | 32 | constexpr uint16_t asKey() const { return fKey; } |
bsalomon | cdee009 | 2016-01-08 13:20:12 -0800 | [diff] [blame] | 33 | |
Brian Salomon | f30b1c1 | 2019-06-20 12:25:02 -0400 | [diff] [blame] | 34 | /** 4 char null terminated string consisting only of chars 'r', 'g', 'b', 'a', '0', and '1'. */ |
Greg Daniel | 369ee6b | 2019-12-02 15:30:02 -0500 | [diff] [blame] | 35 | SkString asString() const; |
bsalomon | cdee009 | 2016-01-08 13:20:12 -0800 | [diff] [blame] | 36 | |
Brian Salomon | 217522c | 2019-06-11 15:55:30 -0400 | [diff] [blame] | 37 | constexpr char operator[](int i) const { |
Brian Salomon | dc82994 | 2018-10-23 16:07:24 -0400 | [diff] [blame] | 38 | SkASSERT(i >= 0 && i < 4); |
Greg Daniel | 369ee6b | 2019-12-02 15:30:02 -0500 | [diff] [blame] | 39 | int idx = (fKey >> (4U * i)) & 0xfU; |
| 40 | return IToC(idx); |
Brian Salomon | dc82994 | 2018-10-23 16:07:24 -0400 | [diff] [blame] | 41 | } |
| 42 | |
bsalomon | 7f9b2e4 | 2016-01-12 13:29:26 -0800 | [diff] [blame] | 43 | /** Applies this swizzle to the input color and returns the swizzled color. */ |
Brian Salomon | b450f3b | 2019-07-09 09:36:51 -0400 | [diff] [blame] | 44 | template <SkAlphaType AlphaType> |
| 45 | constexpr SkRGBA4f<AlphaType> applyTo(const SkRGBA4f<AlphaType>& color) const; |
Brian Salomon | 217522c | 2019-06-11 15:55:30 -0400 | [diff] [blame] | 46 | |
| 47 | void apply(SkRasterPipeline*) const; |
Brian Osman | ce42551 | 2017-03-22 14:37:50 -0400 | [diff] [blame] | 48 | |
Brian Salomon | 2151165 | 2018-10-17 08:30:51 -0400 | [diff] [blame] | 49 | static constexpr GrSwizzle RGBA() { return GrSwizzle("rgba"); } |
| 50 | static constexpr GrSwizzle AAAA() { return GrSwizzle("aaaa"); } |
| 51 | static constexpr GrSwizzle RRRR() { return GrSwizzle("rrrr"); } |
| 52 | static constexpr GrSwizzle RRRA() { return GrSwizzle("rrra"); } |
| 53 | static constexpr GrSwizzle BGRA() { return GrSwizzle("bgra"); } |
Greg Daniel | f259b8b | 2019-02-14 09:03:43 -0500 | [diff] [blame] | 54 | static constexpr GrSwizzle RGB1() { return GrSwizzle("rgb1"); } |
bsalomon | cdee009 | 2016-01-08 13:20:12 -0800 | [diff] [blame] | 55 | |
Brian Salomon | 2151165 | 2018-10-17 08:30:51 -0400 | [diff] [blame] | 56 | private: |
Greg Daniel | 369ee6b | 2019-12-02 15:30:02 -0500 | [diff] [blame] | 57 | explicit constexpr GrSwizzle(uint16_t key) : fKey(key) {} |
| 58 | |
Brian Salomon | b450f3b | 2019-07-09 09:36:51 -0400 | [diff] [blame] | 59 | template <SkAlphaType AlphaType> |
| 60 | static constexpr float ComponentIndexToFloat(const SkRGBA4f<AlphaType>& color, int idx); |
Brian Salomon | 217522c | 2019-06-11 15:55:30 -0400 | [diff] [blame] | 61 | static constexpr int CToI(char c); |
| 62 | static constexpr char IToC(int idx); |
| 63 | |
Greg Daniel | f259b8b | 2019-02-14 09:03:43 -0500 | [diff] [blame] | 64 | uint16_t fKey; |
bsalomon | cdee009 | 2016-01-08 13:20:12 -0800 | [diff] [blame] | 65 | }; |
| 66 | |
Brian Salomon | 217522c | 2019-06-11 15:55:30 -0400 | [diff] [blame] | 67 | constexpr GrSwizzle::GrSwizzle(const char c[4]) |
Greg Daniel | 369ee6b | 2019-12-02 15:30:02 -0500 | [diff] [blame] | 68 | : fKey((CToI(c[0]) << 0) | (CToI(c[1]) << 4) | (CToI(c[2]) << 8) | (CToI(c[3]) << 12)) {} |
Brian Salomon | 217522c | 2019-06-11 15:55:30 -0400 | [diff] [blame] | 69 | |
| 70 | constexpr GrSwizzle::GrSwizzle(const GrSwizzle& that) |
Greg Daniel | 369ee6b | 2019-12-02 15:30:02 -0500 | [diff] [blame] | 71 | : fKey(that.fKey) {} |
Brian Salomon | 217522c | 2019-06-11 15:55:30 -0400 | [diff] [blame] | 72 | |
| 73 | constexpr GrSwizzle& GrSwizzle::operator=(const GrSwizzle& that) { |
Brian Salomon | 217522c | 2019-06-11 15:55:30 -0400 | [diff] [blame] | 74 | fKey = that.fKey; |
| 75 | return *this; |
| 76 | } |
| 77 | |
Brian Salomon | b450f3b | 2019-07-09 09:36:51 -0400 | [diff] [blame] | 78 | template <SkAlphaType AlphaType> |
| 79 | constexpr SkRGBA4f<AlphaType> GrSwizzle::applyTo(const SkRGBA4f<AlphaType>& color) const { |
Brian Salomon | 217522c | 2019-06-11 15:55:30 -0400 | [diff] [blame] | 80 | uint32_t key = fKey; |
| 81 | // Index of the input color that should be mapped to output r. |
| 82 | int idx = (key & 15); |
| 83 | float outR = ComponentIndexToFloat(color, idx); |
| 84 | key >>= 4; |
| 85 | idx = (key & 15); |
| 86 | float outG = ComponentIndexToFloat(color, idx); |
| 87 | key >>= 4; |
| 88 | idx = (key & 15); |
| 89 | float outB = ComponentIndexToFloat(color, idx); |
| 90 | key >>= 4; |
| 91 | idx = (key & 15); |
| 92 | float outA = ComponentIndexToFloat(color, idx); |
| 93 | return { outR, outG, outB, outA }; |
| 94 | } |
| 95 | |
Brian Salomon | b450f3b | 2019-07-09 09:36:51 -0400 | [diff] [blame] | 96 | template <SkAlphaType AlphaType> |
| 97 | constexpr float GrSwizzle::ComponentIndexToFloat(const SkRGBA4f<AlphaType>& color, int idx) { |
Brian Salomon | 217522c | 2019-06-11 15:55:30 -0400 | [diff] [blame] | 98 | if (idx <= 3) { |
| 99 | return color[idx]; |
| 100 | } |
Brian Salomon | f30b1c1 | 2019-06-20 12:25:02 -0400 | [diff] [blame] | 101 | if (idx == CToI('1')) { |
Brian Salomon | 217522c | 2019-06-11 15:55:30 -0400 | [diff] [blame] | 102 | return 1.0f; |
| 103 | } |
Brian Salomon | f30b1c1 | 2019-06-20 12:25:02 -0400 | [diff] [blame] | 104 | if (idx == CToI('0')) { |
| 105 | return 1.0f; |
| 106 | } |
Brian Salomon | 24fc4eb | 2019-06-26 14:15:36 -0400 | [diff] [blame] | 107 | SkUNREACHABLE; |
Brian Salomon | 217522c | 2019-06-11 15:55:30 -0400 | [diff] [blame] | 108 | } |
| 109 | |
| 110 | constexpr int GrSwizzle::CToI(char c) { |
| 111 | switch (c) { |
Brian Salomon | f30b1c1 | 2019-06-20 12:25:02 -0400 | [diff] [blame] | 112 | // r...a must map to 0...3 because other methods use them as indices into fSwiz. |
| 113 | case 'r': return 0; |
| 114 | case 'g': return 1; |
| 115 | case 'b': return 2; |
| 116 | case 'a': return 3; |
| 117 | case '0': return 4; |
| 118 | case '1': return 5; |
Brian Salomon | 24fc4eb | 2019-06-26 14:15:36 -0400 | [diff] [blame] | 119 | default: SkUNREACHABLE; |
Brian Salomon | 217522c | 2019-06-11 15:55:30 -0400 | [diff] [blame] | 120 | } |
| 121 | } |
| 122 | |
| 123 | constexpr char GrSwizzle::IToC(int idx) { |
Brian Salomon | f30b1c1 | 2019-06-20 12:25:02 -0400 | [diff] [blame] | 124 | switch (idx) { |
| 125 | case CToI('r'): return 'r'; |
| 126 | case CToI('g'): return 'g'; |
| 127 | case CToI('b'): return 'b'; |
| 128 | case CToI('a'): return 'a'; |
| 129 | case CToI('0'): return '0'; |
| 130 | case CToI('1'): return '1'; |
Brian Salomon | 24fc4eb | 2019-06-26 14:15:36 -0400 | [diff] [blame] | 131 | default: SkUNREACHABLE; |
Brian Salomon | 217522c | 2019-06-11 15:55:30 -0400 | [diff] [blame] | 132 | } |
| 133 | } |
| 134 | |
Brian Salomon | f30b1c1 | 2019-06-20 12:25:02 -0400 | [diff] [blame] | 135 | constexpr GrSwizzle GrSwizzle::Concat(const GrSwizzle& a, const GrSwizzle& b) { |
Greg Daniel | 369ee6b | 2019-12-02 15:30:02 -0500 | [diff] [blame] | 136 | uint16_t key = 0; |
Brian Salomon | f30b1c1 | 2019-06-20 12:25:02 -0400 | [diff] [blame] | 137 | for (int i = 0; i < 4; ++i) { |
| 138 | int idx = (b.fKey >> (4U * i)) & 0xfU; |
Greg Daniel | 369ee6b | 2019-12-02 15:30:02 -0500 | [diff] [blame] | 139 | if (idx != CToI('0') && idx != CToI('1')) { |
| 140 | SkASSERT(idx >= 0 && idx < 4); |
| 141 | // Get the index value stored in a at location idx. |
| 142 | idx = ((a.fKey >> (4U * idx)) & 0xfU); |
Brian Salomon | f30b1c1 | 2019-06-20 12:25:02 -0400 | [diff] [blame] | 143 | } |
Greg Daniel | 369ee6b | 2019-12-02 15:30:02 -0500 | [diff] [blame] | 144 | key |= (idx << (4U * i)); |
Brian Salomon | f30b1c1 | 2019-06-20 12:25:02 -0400 | [diff] [blame] | 145 | } |
Greg Daniel | 369ee6b | 2019-12-02 15:30:02 -0500 | [diff] [blame] | 146 | return GrSwizzle(key); |
Brian Salomon | f30b1c1 | 2019-06-20 12:25:02 -0400 | [diff] [blame] | 147 | } |
bsalomon | cdee009 | 2016-01-08 13:20:12 -0800 | [diff] [blame] | 148 | #endif |