text: /*====================================================================*
   -  Copyright (C) 2001 Leptonica.  All rights reserved.
   -
   -  Redistribution and use in source and binary forms, with or without
   -  modification, are permitted provided that the following conditions
   -  are met:
   -  1. Redistributions of source code must retain the above copyright
   -     notice, this list of conditions and the following disclaimer.
   -  2. Redistributions in binary form must reproduce the above
   -     copyright notice, this list of conditions and the following
   -     disclaimer in the documentation and/or other materials
   -     provided with the distribution.
   -
   -  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   -  ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   -  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   -  A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL ANY
   -  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   -  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   -  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   -  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
   -  OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   -  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   -  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *====================================================================*/
  
  /*
   * lightcolortest.c
   *
   *   Determines if there are light colors on the image.
   */
  
  #ifdef HAVE_CONFIG_H
  #include <config_auto.h>
  #endif  /* HAVE_CONFIG_H */
  
  #include "allheaders.h"
  
  static const l_int32  nbins = 10;
  
  int main(int    argc,
           char **argv)
  {
  char        *name, *tail;
  l_int32      i, j, n, minval, maxval, rdiff, gdiff, bdiff, maxdiff;
  l_uint32    *rau32, *gau32, *bau32, *carray, *darray;
  PIX         *pixs, *pix1, *pix2, *pix3, *pix4;
  PIXA        *pixa, *pixa1;
  SARRAY      *sa;
  static char  mainName[] = "lightcolortest";
  
      if (argc != 1)
          return ERROR_INT(" Syntax:  lightcolortest", mainName, 1);
  
      setLeptDebugOK(1);
      sa = getSortedPathnamesInDirectory( ".", "comap.", 0, 0);
      sarrayWriteStderr(sa);
      n = sarrayGetCount(sa);
      lept_stderr("n = %d\n", n);
      pixa = pixaCreate(n);
      for (i = 0; i < n; i++) {
          pixa1 = pixaCreate(2);
          name = sarrayGetString(sa, i, L_NOCOPY);
          splitPathAtDirectory(name, NULL, &tail);
          pixs = pixRead(name);
          lept_stderr("%s:\n", tail);
          pix1 = pixScaleBySampling(pixs, 0.2, 0.2);
  
          pixGetBinnedComponentRange(pix1, nbins, 2, L_SELECT_RED,
                                     &minval, &maxval, &rau32, 0);
          lept_stderr("  Red: max = %d, min = %d\n", maxval, minval);
          rdiff = maxval - minval;
          pixGetBinnedComponentRange(pix1, nbins, 2, L_SELECT_GREEN,
                                     &minval, &maxval, &gau32, 0);
          lept_stderr("  Green: max = %d, min = %d\n", maxval, minval);
          gdiff = maxval - minval;
          pixGetBinnedComponentRange(pix1, nbins, 2, L_SELECT_BLUE,
                                     &minval, &maxval, &bau32, 0);
          lept_stderr("  Blue: max = %d, min = %d\n", maxval, minval);
          bdiff = maxval - minval;
          lept_stderr("rdiff = %d, gdiff = %d, bdiff = %d\n\n",
                      rdiff, gdiff, bdiff);
          maxdiff = L_MAX(rdiff, gdiff);
          maxdiff = L_MAX(maxdiff, bdiff);
          if (maxdiff == rdiff) {
              carray = rau32;
              lept_free(gau32);
              lept_free(bau32);
          } else if (maxdiff == gdiff) {
              carray = gau32;
              lept_free(bau32);
              lept_free(rau32);
          } else {   /* maxdiff == bdiff */
              carray = bau32;
              lept_free(rau32);
              lept_free(gau32);
          }
  
          pix2 = pixDisplayColorArray(carray, nbins, 200, 5, 6);
          pixaAddPix(pixa1, pix2, L_INSERT);
  
          darray = (l_uint32 *)lept_calloc(nbins, sizeof(l_uint32));
          for (j = 0; j < nbins; j++) {
              pixelLinearMapToTargetColor(carray[j], carray[nbins - 1],
                             0xffffff00, &darray[j]);
          }
          pix3 = pixDisplayColorArray(darray, nbins, 200, 5, 6);
          pixaAddPix(pixa1, pix3, L_INSERT);
          pix4 = pixaDisplayLinearly(pixa1, L_VERT, 1.0, 0, 30, 3, NULL);
          pixaAddPix(pixa, pix4, L_INSERT);
  
          pixaDestroy(&pixa1);
          pixDestroy(&pixs);
          pixDestroy(&pix1);
          lept_free(tail);
          lept_free(carray);
          lept_free(darray);
      }
  
      lept_mkdir("lept/color");
      pixaConvertToPdf(pixa, 100, 1.0, L_FLATE_ENCODE, 0, "lightcolortest",
                       "/tmp/lept/color/lightcolortest.pdf");
      L_INFO("Generated pdf file: /tmp/lept/color/lightcolortest.pdf",
             mainName);
      pixaDestroy(&pixa);
      sarrayDestroy(&sa);
      return 0;
  }
  