/////////////////////////////////////////////////////////////////////////////
// Rev 11/12/2003                                               
// 
// 
//                             BMP2JPG.C
//                             ---------
// 
// 
// Sylvain MARECHAL - sylvain.marechal1@libertysurf.fr
/////////////////////////////////////////////////////////////////////////////
// 
//  Convert a bmp file to jpeg.
//  should be linked with the jpeglib-6b (http://www.ijg.org/)
// 
/////////////////////////////////////////////////////////////////////////////

#include "cdjpeg.h"		/* Common decls for cjpeg/djpeg applications */
#include "jversion.h"		/* for version message */

#ifdef USE_CCOMMAND		/* command-line reader for Macintosh */
#ifdef __MWERKS__
#include <SIOUX.h>              /* Metrowerks needs this */
#include <console.h>		/* ... and this */
#endif
#ifdef THINK_C
#include <console.h>		/* Think declares it here */
#endif
#endif
#include "bmp2jpg.h"


/* Create the add-on message string table. */

#define JMESSAGE(code,string)	string ,

static const char * const cdjpeg_message_table[] = {
#include "cderror.h"
  NULL
};



#define MAIN
#ifdef MAIN
// The test program
int main( int argc, char * argv[] )
{
    if( argc != 3 )
    {
	printf( "Usage : %s <file_in.bmp> <file_out.jpg>\n" );
	return 1;
    }
    return Bmp2Jpg( argv[1], argv[2] );
}
#endif

/////////////////////////////////////////////////////////////////////////////
//
//        BMP2JPG
/////////////////////////////////////////////////////////////////////////////
//
//  DESCRIPTION
//       --Bmp2Jpg--
//
//	See jpeg-6b/cjpeg.c for details
//	(This is a dirty copy-paste)
//
//
//  ARGUMENTS
//        Argument1:  char * pszBmpFile
//        Argument2: char * pszJpgFile
//  RETOUR/RESULTAT
//        int 
//  REMARQUE
//  Rev 11/12/2003 
//////////////////////////////////////////////////////////////////////////////
int Bmp2Jpg( char * pszBmpFile, char * pszJpgFile )
{
  struct jpeg_compress_struct cinfo;
  struct jpeg_error_mgr jerr;
  cjpeg_source_ptr src_mgr;
  FILE * input_file;
  FILE * output_file;
  JDIMENSION num_scanlines;

  /* Initialize the JPEG compression object with default error handling. */
  cinfo.err = jpeg_std_error(&jerr);
  jpeg_create_compress(&cinfo);
  /* Add some application-specific error messages (from cderror.h) */
  jerr.addon_message_table = cdjpeg_message_table;
  jerr.first_addon_message = JMSG_FIRSTADDONCODE;
  jerr.last_addon_message = JMSG_LASTADDONCODE;


  /* Initialize JPEG parameters.
   * Much of this may be overridden later.
   * In particular, we don't yet know the input file's color space,
   * but we need to provide some value for jpeg_set_defaults() to work.
   */

  cinfo.in_color_space = JCS_RGB; /* arbitrary guess */
  jpeg_set_defaults(&cinfo);

  /* Open the input file. */
  if ((input_file = fopen(pszBmpFile, READ_BINARY)) == NULL) {
    return -1;
  }
  /* Open the output file. */
  if ((output_file = fopen(pszJpgFile, WRITE_BINARY)) == NULL) {
    return -1;
  }
 
  /* Figure out the input file format, and set up to read it. */
  src_mgr = (cjpeg_source_ptr)jinit_read_bmp(&cinfo);
  src_mgr->input_file = input_file;

  /* Read the input file header to obtain file size & colorspace. */
  (*src_mgr->start_input) (&cinfo, src_mgr);

  /* Now that we know input colorspace, fix colorspace-dependent defaults */
  jpeg_default_colorspace(&cinfo);

  /* Adjust default compression parameters by re-parsing the options */
  //file_index = parse_switches(&cinfo, argc, argv, 0, TRUE);

  /* Specify data destination for compression */
  jpeg_stdio_dest(&cinfo, output_file);

  /* Start compressor */
  jpeg_start_compress(&cinfo, TRUE);

  /* Process data */
  while (cinfo.next_scanline < cinfo.image_height) {
    num_scanlines = (*src_mgr->get_pixel_rows) (&cinfo, src_mgr);
    (void) jpeg_write_scanlines(&cinfo, src_mgr->buffer, num_scanlines);
  }

  /* Finish compression and release memory */
  (*src_mgr->finish_input) (&cinfo, src_mgr);
  jpeg_finish_compress(&cinfo);
  jpeg_destroy_compress(&cinfo);

  /* Close files, if we opened them */
  if (input_file != stdin)
    fclose(input_file);
  if (output_file != stdout)
    fclose(output_file);

  return 0;
}