/***********************************************************************
 * SIVP - Scilab Image and Video Processing toolbox
 * Copyright (C) 2006  Shiqi Yu
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 ***********************************************************************/


#include "common.h"
/************************************************************
 * im2=int_cvtcolor(im, cvt_code);
 * cvt_code = 'rgb2hsv', 'hsv2rgb', 'rgb2ycrcb', 'ycrcb2rgb'
 ************************************************************/

int int_cvtcolor(char *fname) 
{
  char * cvt_str_code = NULL; //input string code
  int cvt_code; //opencv cvt_color code

  IplImage * src_image = NULL;
  IplImage * src_f32_image = NULL;
  IplImage * dst_f32_image = NULL;
  IplImage * dst_f64_image = NULL;

  int m2, n2, l2;

  //check the number of input and output parameters
  CheckRhs(2,2);
  CheckLhs(1,1);

  GetRhsVar(2, "c", &m2, &n2, &l2);
  cvt_str_code = cstk(l2);

  //load the input image
  src_image = Mat2IplImg(1);

  // check if input image is correctly loaded
  if(src_image == NULL)
    {
      sciprint("%s error: can't load the input image.\r\n", fname);
      return -1;
    }
  //check the number of channels
  if(src_image->nChannels != 3)
    {
      sciprint("%s error: The input image must be 3-channel image.\r\n", fname);
      cvReleaseImage(&src_image);
      return -1;
    }
  //this function is called 
  //from scilab macros rgb2hsv/hsv2rgb/...
  //the input image can only be double float.
  if(src_image->depth != IPL_DEPTH_64F)
    {
      sciprint("%s error: The input image must be double type.\r\n", fname);
      cvReleaseImage(&src_image);
      return -1;
    }
  
  if( strcmp(cvt_str_code, "rgb2hsv") == 0)
    cvt_code = CV_BGR2HSV; //the channel order of IplImage in SIVP is BGR
  else if( strcmp(cvt_str_code, "hsv2rgb") == 0)
    cvt_code = CV_HSV2BGR;
  else if( strcmp(cvt_str_code, "rgb2ycrcb") == 0)
    cvt_code = CV_BGR2YCrCb;
  else if( strcmp(cvt_str_code, "ycrcb2rgb") == 0)
    cvt_code = CV_YCrCb2BGR;
  else
    {
      sciprint("%s error: unsupport convertion code %s.\r\n", fname, cvt_str_code);
      cvReleaseImage(&src_image);
      return -1;
    }
  //create images needed
  src_f32_image = cvCreateImage(cvGetSize(src_image), 
				IPL_DEPTH_32F,
				3);
  dst_f32_image = cvCreateImage(cvGetSize(src_image), 
				IPL_DEPTH_32F,
				3);
  dst_f64_image = cvCreateImage(cvGetSize(src_image), 
				IPL_DEPTH_64F,
				3);

  if(src_f32_image == NULL ||
     dst_f32_image == NULL ||
     dst_f64_image == NULL)
    {
      sciprint("Error: create image error.\r\n");
      cvReleaseImage(&src_image);
      cvReleaseImage(&src_f32_image);
      cvReleaseImage(&dst_f32_image);
      cvReleaseImage(&dst_f64_image);
      return -1;
    }

  cvConvert(src_image, src_f32_image);
 
  cvCvtColor(src_f32_image, dst_f32_image, cvt_code);
  
  cvConvert(dst_f32_image, dst_f64_image);

  IplImg2Mat(dst_f64_image, 3);
  //send the result
  LhsVar(1)=3;

  cvReleaseImage(&src_image);
  cvReleaseImage(&src_f32_image);
  cvReleaseImage(&dst_f32_image);
  cvReleaseImage(&dst_f64_image);
  
  return 0;
}