Little CMS¶

//  Little cms
//  Copyright (C) 1998-2010 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.

// Creates a devicelink that decodes TIFF8 Lab files

#include "lcms2.h"
#include <stdlib.h>
#include <math.h>

static
double DecodeAbTIFF(double ab)
{
  if (ab <= 128.)
    ab += 127.;
  else
    ab -= 127.;

  return ab;
}

static
cmsToneCurve* CreateStep(void)
{
  cmsToneCurve* Gamma;
  cmsUInt16Number* Table;
  int i;
  double a;

  Table = calloc(4096, sizeof(cmsUInt16Number));
  if (Table == NULL) return NULL;

  for (i=0; i < 4096; i++) {
    a = (double) i * 255. / 4095.;
    a = DecodeAbTIFF(a);
    Table[i] = (cmsUInt16Number) floor(a * 257. + 0.5);
  }
  Gamma = cmsBuildTabulatedToneCurve16(0, 4096, Table);
  free(Table);
  return Gamma;
}


static
cmsToneCurve* CreateLinear(void)
{
  cmsUInt16Number Linear[2] = { 0, 0xffff };
  return cmsBuildTabulatedToneCurve16(0, 2, Linear);
}



// Set the copyright and description
static
cmsBool SetTextTags(cmsHPROFILE hProfile)
{
    cmsMLU *DescriptionMLU, *CopyrightMLU;
    cmsBool  rc = FALSE;
    DescriptionMLU  = cmsMLUalloc(0, 1);
    CopyrightMLU    = cmsMLUalloc(0, 1);
    if (DescriptionMLU == NULL || CopyrightMLU == NULL) goto Error;
    if (!cmsMLUsetASCII(DescriptionMLU,  "en", "US", "Little cms Tiff8 CIELab")) goto Error;
    if (!cmsMLUsetASCII(CopyrightMLU,    "en", "US", "Copyright (c) Marti Maria, 2010. All rights reserved.")) goto Error;
    if (!cmsWriteTag(hProfile, cmsSigProfileDescriptionTag,  DescriptionMLU)) goto Error;
    if (!cmsWriteTag(hProfile, cmsSigCopyrightTag,           CopyrightMLU)) goto Error;
    rc = TRUE;

Error:
    if (DescriptionMLU)
        cmsMLUfree(DescriptionMLU);
    if (CopyrightMLU)
        cmsMLUfree(CopyrightMLU);
    return rc;
}


int main(int argc, char *argv[])
{
  cmsHPROFILE hProfile;
  cmsPipeline *AToB0;
  cmsToneCurve* PreLinear[3];
  cmsToneCurve *Lin, *Step;

  fprintf(stderr, "Creating lcmstiff8.icm...");

    remove("lcmstiff8.icm");
  hProfile = cmsOpenProfileFromFile("lcmstiff8.icm", "w");

  // Create linearization
  Lin  = CreateLinear();
  Step = CreateStep();

  PreLinear[0] = Lin;
  PreLinear[1] = Step;
  PreLinear[2] = Step;

  AToB0 = cmsPipelineAlloc(0, 3, 3);
  cmsPipelineInsertStage(AToB0,
  cmsAT_BEGIN, cmsStageAllocToneCurves(0, 3, PreLinear));
  cmsSetColorSpace(hProfile, cmsSigLabData);
  cmsSetPCS(hProfile, cmsSigLabData);
  cmsSetDeviceClass(hProfile, cmsSigLinkClass);
  cmsSetProfileVersion(hProfile, 4.2);
  cmsWriteTag(hProfile, cmsSigAToB0Tag, AToB0);
  SetTextTags(hProfile);
  cmsCloseProfile(hProfile);
  cmsFreeToneCurve(Lin);
  cmsFreeToneCurve(Step);
  cmsPipelineFree(AToB0);

  fprintf(stderr, "Done.\n");
  return 0;
}