jpegutil.cpp

这是个人脸识别程序

// $image\jpegutil.cpp 1.5 milbo$ jpeg library hooks
// Warning: this is raw research code -- expect it to be quite messy.
// milbo mar 2005 petalum

#include <windows.h>
#include <io.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <signal.h>
#include <float.h>
#include <math.h>
#include <new.h>
#include <direct.h>
#include <sys/stat.h>
#include <fstream.h>
#include <iostream.h>

extern FILE *Fopen(const char *sPath, const char *sMode);

extern "C" 
{
#define XMD_H	/* get cdjpeg.h to not issue compiler warnings */
#include "cdjpeg.h"
}

//-----------------------------------------------------------------------------

// Create the add-on message string table

#define JMESSAGE(code,string)	string ,

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

void ConvertJpgFileToBmpFile (const char sJpegFile[], FILE *pOutFile, unsigned Width)
{
static struct jpeg_decompress_struct cinfo;
static struct jpeg_error_mgr jerr;
djpeg_dest_ptr dest_mgr = NULL;
FILE *pInFile = NULL;
JDIMENSION num_scanlines;

/* Initialize the CONVERT_JPEG_TO_BMP decompression object with default error handling. */
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_decompress(&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;

pInFile = Fopen(sJpegFile, READ_BINARY);	// Fopen will exit with a msg if can't open

/* Specify data source for decompression */
jpeg_stdio_src(&cinfo, pInFile);

/* Read file header, set default decompression parameters */
(void)jpeg_read_header(&cinfo, true);

cinfo.err->trace_level = 0;
cinfo.dct_method = JDCT_ISLOW;	// milbo: this is the default in their vc libs

dest_mgr = jinit_write_bmp(&cinfo, false);

// lprintf("Decompressing %s => %s\n", sJpegFile, sBmpFile);

dest_mgr->output_file = pOutFile;

if (Width && cinfo.image_width != Width)
	{
	cinfo.scale_num = Width;
	cinfo.scale_denom = cinfo.output_width;
	}

(void)jpeg_start_decompress(&cinfo);  			/* start decompressor */

(*dest_mgr->start_output)(&cinfo, dest_mgr);	/* write output file header */

while (cinfo.output_scanline < cinfo.output_height)   	/* process data */
	{
	num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
										dest_mgr->buffer_height);

	(*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
  	}

/* Finish decompression and release memory.
 * I must do it in this order because output module has allocated memory
 * of lifespan JPOOL_IMAGE; it needs to finish before releasing memory.
 */
(*dest_mgr->finish_output) (&cinfo, dest_mgr);
(void)jpeg_finish_decompress(&cinfo);

jpeg_destroy_decompress(&cinfo);

fclose(pInFile);
}