1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/qcms/transform_util.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,93 @@
1.4 +/* vim: set ts=8 sw=8 noexpandtab: */
1.5 +// qcms
1.6 +// Copyright (C) 2009 Mozilla Foundation
1.7 +// Copyright (C) 1998-2007 Marti Maria
1.8 +//
1.9 +// Permission is hereby granted, free of charge, to any person obtaining
1.10 +// a copy of this software and associated documentation files (the "Software"),
1.11 +// to deal in the Software without restriction, including without limitation
1.12 +// the rights to use, copy, modify, merge, publish, distribute, sublicense,
1.13 +// and/or sell copies of the Software, and to permit persons to whom the Software
1.14 +// is furnished to do so, subject to the following conditions:
1.15 +//
1.16 +// The above copyright notice and this permission notice shall be included in
1.17 +// all copies or substantial portions of the Software.
1.18 +//
1.19 +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
1.20 +// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
1.21 +// THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
1.22 +// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
1.23 +// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
1.24 +// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
1.25 +// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
1.26 +
1.27 +#ifndef _QCMS_TRANSFORM_UTIL_H
1.28 +#define _QCMS_TRANSFORM_UTIL_H
1.29 +
1.30 +#include <stdlib.h>
1.31 +
1.32 +#define CLU(table,x,y,z) table[(x*len + y*x_len + z*xy_len)*3]
1.33 +
1.34 +//XXX: could use a bettername
1.35 +typedef uint16_t uint16_fract_t;
1.36 +
1.37 +float lut_interp_linear(double value, uint16_t *table, int length);
1.38 +float lut_interp_linear_float(float value, float *table, int length);
1.39 +uint16_t lut_interp_linear16(uint16_t input_value, uint16_t *table, int length);
1.40 +
1.41 +
1.42 +static inline float lerp(float a, float b, float t)
1.43 +{
1.44 + return a*(1.f-t) + b*t;
1.45 +}
1.46 +
1.47 +static inline unsigned char clamp_u8(float v)
1.48 +{
1.49 + if (v > 255.)
1.50 + return 255;
1.51 + else if (v < 0)
1.52 + return 0;
1.53 + else
1.54 + return floorf(v+.5);
1.55 +}
1.56 +
1.57 +static inline float clamp_float(float a)
1.58 +{
1.59 + /* One would naturally write this function as the following:
1.60 + if (a > 1.)
1.61 + return 1.;
1.62 + else if (a < 0)
1.63 + return 0;
1.64 + else
1.65 + return a;
1.66 +
1.67 + However, that version will let NaNs pass through which is undesirable
1.68 + for most consumers.
1.69 + */
1.70 +
1.71 + if (a > 1.)
1.72 + return 1.;
1.73 + else if (a >= 0)
1.74 + return a;
1.75 + else // a < 0 or a is NaN
1.76 + return 0;
1.77 +}
1.78 +
1.79 +static inline float u8Fixed8Number_to_float(uint16_t x)
1.80 +{
1.81 + // 0x0000 = 0.
1.82 + // 0x0100 = 1.
1.83 + // 0xffff = 255 + 255/256
1.84 + return x/256.;
1.85 +}
1.86 +
1.87 +float *build_input_gamma_table(struct curveType *TRC);
1.88 +struct matrix build_colorant_matrix(qcms_profile *p);
1.89 +void build_output_lut(struct curveType *trc,
1.90 + uint16_t **output_gamma_lut, size_t *output_gamma_lut_length);
1.91 +
1.92 +struct matrix matrix_invert(struct matrix mat);
1.93 +qcms_bool compute_precache(struct curveType *trc, uint8_t *output);
1.94 +
1.95 +
1.96 +#endif
