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comparison: gfx/qcms/transform_util.h
gfx/qcms/transform_util.h
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| 1 /* vim: set ts=8 sw=8 noexpandtab: */ | |
| 2 // qcms | |
| 3 // Copyright (C) 2009 Mozilla Foundation | |
| 4 // Copyright (C) 1998-2007 Marti Maria | |
| 5 // | |
| 6 // Permission is hereby granted, free of charge, to any person obtaining | |
| 7 // a copy of this software and associated documentation files (the "Software"), | |
| 8 // to deal in the Software without restriction, including without limitation | |
| 9 // the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
| 10 // and/or sell copies of the Software, and to permit persons to whom the Software | |
| 11 // is furnished to do so, subject to the following conditions: | |
| 12 // | |
| 13 // The above copyright notice and this permission notice shall be included in | |
| 14 // all copies or substantial portions of the Software. | |
| 15 // | |
| 16 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
| 17 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO | |
| 18 // THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
| 19 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE | |
| 20 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION | |
| 21 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION | |
| 22 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
| 23 | |
| 24 #ifndef _QCMS_TRANSFORM_UTIL_H | |
| 25 #define _QCMS_TRANSFORM_UTIL_H | |
| 26 | |
| 27 #include <stdlib.h> | |
| 28 | |
| 29 #define CLU(table,x,y,z) table[(x*len + y*x_len + z*xy_len)*3] | |
| 30 | |
| 31 //XXX: could use a bettername | |
| 32 typedef uint16_t uint16_fract_t; | |
| 33 | |
| 34 float lut_interp_linear(double value, uint16_t *table, int length); | |
| 35 float lut_interp_linear_float(float value, float *table, int length); | |
| 36 uint16_t lut_interp_linear16(uint16_t input_value, uint16_t *table, int length); | |
| 37 | |
| 38 | |
| 39 static inline float lerp(float a, float b, float t) | |
| 40 { | |
| 41 return a*(1.f-t) + b*t; | |
| 42 } | |
| 43 | |
| 44 static inline unsigned char clamp_u8(float v) | |
| 45 { | |
| 46 if (v > 255.) | |
| 47 return 255; | |
| 48 else if (v < 0) | |
| 49 return 0; | |
| 50 else | |
| 51 return floorf(v+.5); | |
| 52 } | |
| 53 | |
| 54 static inline float clamp_float(float a) | |
| 55 { | |
| 56 /* One would naturally write this function as the following: | |
| 57 if (a > 1.) | |
| 58 return 1.; | |
| 59 else if (a < 0) | |
| 60 return 0; | |
| 61 else | |
| 62 return a; | |
| 63 | |
| 64 However, that version will let NaNs pass through which is undesirable | |
| 65 for most consumers. | |
| 66 */ | |
| 67 | |
| 68 if (a > 1.) | |
| 69 return 1.; | |
| 70 else if (a >= 0) | |
| 71 return a; | |
| 72 else // a < 0 or a is NaN | |
| 73 return 0; | |
| 74 } | |
| 75 | |
| 76 static inline float u8Fixed8Number_to_float(uint16_t x) | |
| 77 { | |
| 78 // 0x0000 = 0. | |
| 79 // 0x0100 = 1. | |
| 80 // 0xffff = 255 + 255/256 | |
| 81 return x/256.; | |
| 82 } | |
| 83 | |
| 84 float *build_input_gamma_table(struct curveType *TRC); | |
| 85 struct matrix build_colorant_matrix(qcms_profile *p); | |
| 86 void build_output_lut(struct curveType *trc, | |
| 87 uint16_t **output_gamma_lut, size_t *output_gamma_lut_length); | |
| 88 | |
| 89 struct matrix matrix_invert(struct matrix mat); | |
| 90 qcms_bool compute_precache(struct curveType *trc, uint8_t *output); | |
| 91 | |
| 92 | |
| 93 #endif |
