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colour.h - blind - suckless command-line video editing utility |
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--- |
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colour.h (5369B) |
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--- |
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1 /* See LICENSE file for copyright and license details. */ |
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2 #include <math.h> |
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3 |
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4 #define D65_XYY_X 0.312726871026564878786047074755 |
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5 #define D65_XYY_Y 0.329023206641284038376227272238 |
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6 |
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7 #define D65_XYZ_X (D65_XYY_X / D65_XYY_Y) |
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8 #define D65_XYZ_Z (1 / D65_XYY_Y - 1 - D65_XYZ_X) |
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9 |
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10 #define SRGB_ENCODE(TYPE, NAME_SUFFIX, MATH_SUFFIX)\ |
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11 static inline TYPE\ |
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12 srgb_encode##NAME_SUFFIX(TYPE t)\ |
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13 {\ |
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14 TYPE sign = 1;\ |
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15 if (t < 0) {\ |
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16 t = -t;\ |
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17 sign = -1;\ |
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18 }\ |
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19 t = t <= (TYPE)0.0031306684425217108\ |
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20 ? (TYPE)12.92 * t\ |
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21 : (TYPE)1.055 * pow##MATH_SUFFIX(t, (TYPE)1.0 / … |
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22 return t * sign;\ |
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23 } |
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24 SRGB_ENCODE(double, _d,) |
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25 SRGB_ENCODE(float, _f, f) |
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26 #undef SRGB_ENCODE |
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27 |
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28 #define SRGB_DECODE(TYPE, NAME_SUFFIX, MATH_SUFFIX)\ |
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29 static inline TYPE\ |
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30 srgb_decode##NAME_SUFFIX(TYPE t)\ |
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31 {\ |
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32 TYPE sign = 1;\ |
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33 if (t < 0) {\ |
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34 t = -t;\ |
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35 sign = -1;\ |
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36 }\ |
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37 t = t <= (TYPE)0.0031306684425217108 * (TYPE)12.92\ |
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38 ? t / (TYPE)12.92\ |
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39 : pow##MATH_SUFFIX((t + (TYPE)0.055) / (TYPE)1.0… |
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40 return t * sign;\ |
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41 } |
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42 SRGB_DECODE(double, _d,) |
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43 SRGB_DECODE(float, _f, f) |
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44 #undef SRGB_DECODE |
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45 |
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46 |
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47 #define MATRIX_MULTIPLY_FUNCTION(FUNCTION, TYPE, R1C1, R1C2, R1C3, R2C1,… |
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48 static inline void\ |
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49 FUNCTION(TYPE ia, TYPE ib, TYPE ic, TYPE *oa, TYPE *ob, TYPE *oc… |
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50 {\ |
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51 *oa = (TYPE)(R1C1) * ia + (TYPE)(R1C2) * ib + (TYPE)(R1C… |
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52 *ob = (TYPE)(R2C1) * ia + (TYPE)(R2C2) * ib + (TYPE)(R2C… |
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53 *oc = (TYPE)(R3C1) * ia + (TYPE)(R3C2) * ib + (TYPE)(R3C… |
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54 } |
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55 #define MATRIX_MULTIPLY_FUNCTIONS(FUNCTION_BASE, ...)\ |
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56 MATRIX_MULTIPLY_FUNCTION(FUNCTION_BASE##_d, double, __VA_ARGS__)\ |
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57 MATRIX_MULTIPLY_FUNCTION(FUNCTION_BASE##_f, float, __VA_ARGS__) |
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58 |
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59 MATRIX_MULTIPLY_FUNCTIONS(yuv_to_srgb, |
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60 0.9998394605874789675681313383392989635467529… |
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61 -0.0011131462925777491079770697979256510734558… |
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62 1.5956196024979483194528029343928210437297821… |
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63 0.9998394605876228524721227586269378662109375… |
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64 -0.3912437451399455312639474868774414062500000… |
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65 -0.8130420103656186281426698769791983067989349… |
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66 0.9998394605875743357259466392861213535070419… |
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67 2.0174178677237781798226023965980857610702514… |
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68 0.0011581972192616640793261240105493925511837… |
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69 |
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70 MATRIX_MULTIPLY_FUNCTIONS(srgb_to_yuv, |
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71 0.2990615856704488817463527539075585082173347… |
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72 0.5870798544208948310796358782681636512279510… |
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73 0.1140191250981231751993050238525029271841049… |
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74 -0.1484681372549019606754683309191022999584674… |
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75 -0.2907475490196078649063338161795400083065032… |
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76 0.4392156862745097978262265314697287976741790… |
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77 0.4392156862745097978262265314697287976741790… |
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78 -0.3680759803921568873441572122828802093863487… |
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79 -0.0711397058823529382376449348157620988786220… |
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80 |
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81 MATRIX_MULTIPLY_FUNCTIONS(ciexyz_to_srgb, |
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82 3.240446254647737500675930277794, |
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83 -1.537134761820080575134284117667, |
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84 -0.498530193022728718155178739835, |
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85 -0.969266606244679751469561779231, |
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86 1.876011959788370209167851498933, |
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87 0.041556042214430065351304932619, |
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88 0.055643503564352832235773149705, |
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89 -0.204026179735960239147729566866, |
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90 1.057226567722703292062647051353) |
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91 |
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92 MATRIX_MULTIPLY_FUNCTIONS(srgb_to_ciexyz, |
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93 0.412457445582367576708548995157, |
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94 0.357575865245515878143578447634, |
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95 0.180437247826399665973085006954, |
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96 0.212673370378408277403536885686, |
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97 0.715151730491031756287156895269, |
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98 0.072174899130559869164791564344, |
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99 0.019333942761673460208893260415, |
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100 0.119191955081838593666354597644, |
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101 0.950302838552371742508739771438) |
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102 |
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103 MATRIX_MULTIPLY_FUNCTIONS(scaled_yuv_to_ciexyz, |
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104 0.0000145009227232664705245415021073185357636… |
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105 0.0000034128157717418533674232691138561435195… |
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106 0.0000056093685351140681549461132482381486852… |
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107 0.0000152565722222869366430254151056900013827… |
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108 -0.0000020512466139801788471278606168501923434… |
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109 -0.0000036929733608348407281540479174530844375… |
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110 0.0000166117942545252278104851717532852717340… |
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111 0.0000285420507795943411387395993727977838716… |
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112 -0.0000009911926544591312073011158886859384153… |
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113 |
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114 MATRIX_MULTIPLY_FUNCTIONS(ciexyz_to_scaled_yuv, |
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115 26633.45812403910895227454602718353271484375 … |
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116 40527.367131481194519437849521636962890625 … |
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117 -272.000824317600745416712015867233276367187… |
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118 -11458.90154486896426533348858356475830078125, |
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119 -26662.3801805758339469321072101593017578125, |
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120 34490.0235254608633113093674182891845703125, |
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121 116394.099928013441967777907848358154296875, |
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122 -88546.58492295184987597167491912841796875, |
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123 -20281.0410136536011123098433017730712890625) |
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124 |
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125 #undef MATRIX_MULTIPLY_FUNCTIONS |
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126 #undef MATRIX_MULTIPLY_FUNCTION |
