1 /* vim: set ts=8 sw=8 noexpandtab: */
3 // Copyright (C) 2009 Mozilla Foundation
4 // Copyright (C) 1998-2007 Marti Maria
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:
13 // The above copyright notice and this permission notice shall be included in
14 // all copies or substantial portions of the Software.
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.
24 #ifndef _QCMS_TRANSFORM_UTIL_H
25 #define _QCMS_TRANSFORM_UTIL_H
29 #define CLU(table,x,y,z) table[(x*len + y*x_len + z*xy_len)*3]
31 //XXX: could use a bettername
32 typedef uint16_t uint16_fract_t
;
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
);
39 static inline float lerp(float a
, float b
, float t
)
41 return a
*(1.f
-t
) + b
*t
;
44 static inline unsigned char clamp_u8(float v
)
54 static inline float clamp_float(float a
)
56 /* One would naturally write this function as the following:
64 However, that version will let NaNs pass through which is undesirable
72 else // a < 0 or a is NaN
76 static inline float u8Fixed8Number_to_float(uint16_t x
)
80 // 0xffff = 255 + 255/256
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
);
89 struct matrix
matrix_invert(struct matrix mat
);
90 qcms_bool
compute_precache(struct curveType
*trc
, uint8_t *output
);