gfx/qcms/transform_util.h
author Narcis Beleuzu <nbeleuzu@mozilla.com>
Mon, 27 May 2019 18:52:34 +0300
changeset 475669 1e50992f413317d69190830a556daea79d98fed3
parent 475664 cd1bb23b475a065640e6fa0783634636288b7f6b
child 475786 e198d4820748d4708dff1967a9d87658011291e3
permissions -rw-r--r--
Backed out 5 changesets (bug 1551084) for build bustages on transform.cpp . CLOSED TREE Backed out changeset af04f8907fab (bug 1551084) Backed out changeset 2a5ae3eb40ce (bug 1551084) Backed out changeset 99874bf89419 (bug 1551084) Backed out changeset d73949bd98e9 (bug 1551084) Backed out changeset cd1bb23b475a (bug 1551084)

/* vim: set ts=8 sw=8 noexpandtab: */
//  qcms
//  Copyright (C) 2009 Mozilla Foundation
//  Copyright (C) 1998-2007 Marti Maria
//
// Permission is hereby granted, free of charge, to any person obtaining 
// a copy of this software and associated documentation files (the "Software"), 
// to deal in the Software without restriction, including without limitation 
// the rights to use, copy, modify, merge, publish, distribute, sublicense, 
// and/or sell copies of the Software, and to permit persons to whom the Software 
// is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in 
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO 
// THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

#ifndef _QCMS_TRANSFORM_UTIL_H
#define _QCMS_TRANSFORM_UTIL_H

#include <stdlib.h>
#include <math.h>

#define CLU(table,x,y,z) table[(x*len + y*x_len + z*xy_len)*3]

//XXX: could use a bettername
typedef uint16_t uint16_fract_t;

float lut_interp_linear(double value, uint16_t *table, int length);
float lut_interp_linear_float(float value, float *table, int length);
uint16_t lut_interp_linear16(uint16_t input_value, uint16_t *table, int length);


static inline float lerp(float a, float b, float t)
{
        return a*(1.f-t) + b*t;
}

static inline unsigned char clamp_u8(float v)
{
  if (v > 255.)
    return 255;
  else if (v < 0)
    return 0;
  else
    return floorf(v+.5);
}

static inline float clamp_float(float a)
{
  /* One would naturally write this function as the following:
  if (a > 1.)
    return 1.;
  else if (a < 0)
    return 0;
  else
    return a;

  However, that version will let NaNs pass through which is undesirable
  for most consumers.
  */

  if (a > 1.)
    return 1.;
  else if (a >= 0)
    return a;
  else // a < 0 or a is NaN
    return 0;
}

static inline float u8Fixed8Number_to_float(uint16_t x)
{
  // 0x0000 = 0.
  // 0x0100 = 1.
  // 0xffff = 255  + 255/256
  return x/256.;
}

float *build_input_gamma_table(struct curveType *TRC);
struct matrix build_colorant_matrix(qcms_profile *p);
void build_output_lut(struct curveType *trc,
                      uint16_t **output_gamma_lut, size_t *output_gamma_lut_length);

struct matrix matrix_invert(struct matrix mat);
qcms_bool compute_precache(struct curveType *trc, uint8_t *output);

// Tested by GTest
#ifdef  __cplusplus
extern "C" {
#endif

uint16_fract_t lut_inverse_interp16(uint16_t Value, uint16_t LutTable[], int length);

#ifdef  __cplusplus
}
#endif

#endif