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94 lines
2.7 KiB
C
94 lines
2.7 KiB
C
/* vim: set ts=8 sw=8 noexpandtab: */
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// qcms
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// Copyright (C) 2009 Mozilla Foundation
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// Copyright (C) 1998-2007 Marti Maria
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the Software
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// is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
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// THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#ifndef _QCMS_TRANSFORM_UTIL_H
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#define _QCMS_TRANSFORM_UTIL_H
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#include <stdlib.h>
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#define CLU(table,x,y,z) table[(x*len + y*x_len + z*xy_len)*3]
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//XXX: could use a bettername
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typedef uint16_t uint16_fract_t;
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float lut_interp_linear(double value, uint16_t *table, int length);
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float lut_interp_linear_float(float value, float *table, int length);
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uint16_t lut_interp_linear16(uint16_t input_value, uint16_t *table, int length);
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static inline float lerp(float a, float b, float t)
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{
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return a*(1.f-t) + b*t;
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}
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static inline unsigned char clamp_u8(float v)
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{
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if (v > 255.)
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return 255;
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else if (v < 0)
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return 0;
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else
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return floorf(v+.5);
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}
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static inline float clamp_float(float a)
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{
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/* One would naturally write this function as the following:
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if (a > 1.)
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return 1.;
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else if (a < 0)
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return 0;
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else
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return a;
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However, that version will let NaNs pass through which is undesirable
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for most consumers.
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*/
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if (a > 1.)
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return 1.;
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else if (a >= 0)
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return a;
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else // a < 0 or a is NaN
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return 0;
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}
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static inline float u8Fixed8Number_to_float(uint16_t x)
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{
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// 0x0000 = 0.
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// 0x0100 = 1.
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// 0xffff = 255 + 255/256
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return x/256.;
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}
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float *build_input_gamma_table(struct curveType *TRC);
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struct matrix build_colorant_matrix(qcms_profile *p);
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void build_output_lut(struct curveType *trc,
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uint16_t **output_gamma_lut, size_t *output_gamma_lut_length);
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struct matrix matrix_invert(struct matrix mat);
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qcms_bool compute_precache(struct curveType *trc, uint8_t *output);
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#endif
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