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.
   *====================================================================*/
  
  /*
   * cornertest.c
   *
   *   e.g., use on witten.tif
   */
  
  #include "allheaders.h"
  
  #define   LINE_SIZE   9
  
  
  main(int    argc,
       char **argv)
  {
  char        *filein, *fileout;
  l_int32      x, y, n, i;
  PIX         *pixs;
  PTA         *pta;
  PTAA        *ptaa, *ptaa2, *ptaa3;
  static char  mainName[] = "cornertest";
  
      if (argc != 3)
  	exit(ERROR_INT(" Syntax:  cornertest filein fileout", mainName, 1));
  
      filein = argv[1];
      fileout = argv[2];
  
      if ((pixs = pixRead(filein)) == NULL)
  	exit(ERROR_INT("pixs not made", mainName, 1));
  
  	/* Clean noise in LR corner of witten.tif */
      pixSetPixel(pixs, 2252, 3051, 0);
      pixSetPixel(pixs, 2252, 3050, 0);
      pixSetPixel(pixs, 2251, 3050, 0);
  
      pta = pixFindCornerPixels(pixs);
      ptaWriteStream(stderr, pta, 1);
  
          /* Test pta and ptaa I/O */
  #if 1
      ptaa = ptaaCreate(3);
      ptaaAddPta(ptaa, pta, L_COPY);
      ptaaAddPta(ptaa, pta, L_COPY);
      ptaaAddPta(ptaa, pta, L_COPY);
      ptaaWriteStream(stderr, ptaa, 1);
      ptaaWrite("/tmp/junkptaa", ptaa, 1);
      ptaa2 = ptaaRead("/tmp/junkptaa");
      ptaaWrite("/tmp/junkptaa2", ptaa2, 1);
      ptaaWrite("/tmp/junkptaa3", ptaa, 0);
      ptaa3 = ptaaRead("/tmp/junkptaa3");
      ptaaWrite("/tmp/junkptaa4", ptaa3, 0);
      ptaaDestroy(&ptaa);
      ptaaDestroy(&ptaa2);
      ptaaDestroy(&ptaa3);
  #endif
  
  	/* mark corner pixels */
      n = ptaGetCount(pta);
      for (i = 0; i < n; i++) {
  	ptaGetIPt(pta, i, &x, &y);
  	pixRenderLine(pixs, x - LINE_SIZE, y, x + LINE_SIZE, y, 3,
  	              L_FLIP_PIXELS);
  	pixRenderLine(pixs, x, y - LINE_SIZE, x, y + LINE_SIZE, 3,
  	              L_FLIP_PIXELS);
      }
  
      pixWrite(fileout, pixs, IFF_PNG);
  
      pixDestroy(&pixs);
      ptaDestroy(&pta);
      ptaDestroy(&pta);
      return 0;
  }
  
  