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/********************************************************************/
/** bbox -- calculates Bounding Box of a pbmraw/ppmraw-picture **/
/** Created: Nov. 1997, revised Feb. 1998, Dec. 1999 **/
/** Author: Roland Bless <roland@bless.de> **/
/** Copyright (C) 1998-2000 Roland Bless **/
/** To compile simply use: **/
/** "cc bbox.c -o bbox" or "make bbox" **/
/********************************************************************/
/*
* $Id: bbox.c,v 1.13 2004/01/25 10:15:48 bless Exp $
*
* $Log: bbox.c,v $
* Revision 1.13 2004/01/25 10:15:48 bless
* - added %%HiResBoundingBox: output (now compatible with bbox device output of ghostscript)
*
* Revision 1.12 2003/11/09 18:16:53 bless
* - print help, license and version to stdout instead of stderr (incorporated patch from Rafael Laboissiere <rafael@debian.org>)
*
* Revision 1.11 2003/07/08 11:14:12 bless
* - added include <string.h> for strcmp()
* - removed unused argument in fprintf() call
*
* Revision 1.10 2000/08/04 08:46:47 bless
* Incorporated bugfix by Dan Blake <dblake@rose.hp.com>: read
* unsigned int into unsigned char variable via sscanf caused crash
* under HP-UX. Thanks, Dan!
*
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#if defined(_WIN32) && !defined(__CYGWIN__)
#include <io.h> /* needed for _setmode() */
#include <fcntl.h>
#endif
/**********************
* global variables *
**********************/
const char *const version= "$Revision: 1.13 $ $Date: 2004/01/25 10:15:48 $";
const char *const prgname= "bbox";
unsigned char bitval[8]=
{
1 << 7,
1 << 6,
1 << 5,
1 << 4,
1 << 3,
1 << 2,
1 << 1,
1
};
static unsigned int
minus_one(const unsigned x)
{
return (x == 0) ? x : x-1;
}
static unsigned int
plus_one(const unsigned x)
{
return (x == (unsigned int) ~0U) ? x : x+1;
}
/***************************** readppm_and_calcbb ***********************
* input: name, resolution, tight *
* output: - (stdout) *
* *
* Reads a RAWPPM or RAWPBM picture file (name or STDIN) and *
* calculates its Bounding Box on-the-fly (line-by-line). *
* *
* Parameters: *
* name: name of the PBMRAW file or NULL (input from stdin) *
* resolution: Pixel per Inch (DPI) *
* tight: boolean value, if false 1 Postscript Point is added to *
each Bounding Box parameter, otherwise the BB is tight *
* The Bounding Box is given in Postscript Points (72 dots/inch) *
* and printed to stdout *
************************************************************************/
/* calculate the bounding box in postscript points, given a resolution in dpi */
static void
readppm_and_calcbb(const char *name,
const unsigned int resolution,
const unsigned char tight)
{
FILE *inputfile;
char inputline[1024];
unsigned char magic_found= 0;
int x,y,byte_x,i;
unsigned int x_min, x_max, y_min, y_max;
unsigned int llx, lly, urx, ury; /* bounding box */
double hllx, hlly, hurx, hury; /* hires bounding box */
unsigned char *image_row, /* ImageRow */
*tmprowp;
unsigned int xmax,ymax; /* Image Size */
unsigned int byte_xmax;
unsigned char stepsize;
unsigned char colmax= 0; /* max color value */
unsigned int ui_colmax= 0; /* max color value */
if ( name == NULL )
{
inputfile = stdin;
name = "- STDIN -";
}
else
{
inputfile = fopen(name,"r");
if ( inputfile == NULL )
{
fprintf(stderr,"%s: ERROR -- could not open file %s\n",
prgname, name);
return;
}
}
/** check for magic number **/
do
{
fgets(inputline, 1024, inputfile);
#ifdef DEBUG
fprintf(stderr,"read:[%s]\n",inputline);
#endif
if ( strcmp(inputline,"P4\n") == 0 )
{
stepsize= 1;
magic_found= 4;
}
else
if ( strcmp(inputline,"P6\n") == 0 )
{
stepsize= 3;
magic_found= 6;
}
}
while ( !feof(inputfile) && !magic_found );
if ( !magic_found )
{
fprintf(stderr,"%s: ERROR -- %s is not in ppmraw or pbmraw format\n",
prgname, name);
return;
}
/** skip comments **/
do
{
fgets(inputline, 1024, inputfile);
#ifdef DEBUG
fprintf(stderr,"read:[%s]\n",inputline);
#endif
if (*inputline == '#')
continue;
else
break;
}
while ( !feof(inputfile) );
/** read picture size: width, height **/
sscanf(inputline,"%u %u",&xmax,&ymax);
if ( magic_found == 6 ) /* PPM file has maximum color-component value */
{
fgets(inputline, 1024, inputfile);
sscanf(inputline,"%u",&ui_colmax);
colmax = (unsigned char) ui_colmax; /* this is safer */
}
#ifdef DEBUG
fprintf(stderr,"\nreading picture: %s X: %u Y: %u\n",name,xmax,ymax);
#endif
x = 0; /* avoid uninitialized warning */
x_min= xmax;
x_max= 0;
y_min= ymax;
y_max= 0;
if ( magic_found == 4 ) /* PBMRAW = Bitmap */
{ /** read raw pbmfile **/
byte_xmax= xmax / 8;
if (xmax % 8 != 0)
byte_xmax++;
}
else /** assume ppm raw **/
{
byte_xmax= xmax * 3; /* we have RGB, i.e. three bytes for each pixel */
}
image_row= malloc(byte_xmax);
if ( image_row )
{
#if defined(_WIN32) && !defined(__CYGWIN__) /* this is really braindead stuff for MSVC */
i= _setmode( _fileno(stdin), _O_BINARY);
if (i == -1)
fprintf(stderr,"%s: ERROR - Cannot set binary mode for STDIN\n");
#endif
for (y= 0; y<ymax-1; y++) /* for every image row */
{
if (fread(image_row, byte_xmax, 1, inputfile) != 1)
{
fprintf(stderr,"%s: WARNING -- fread incomplete - file %s seems to be corrupt\n", prgname, name);
break;
}
tmprowp= image_row;
/* inspect this line from the left */
for (byte_x= 0; byte_x<byte_xmax; byte_x++,tmprowp++)
{
if (*tmprowp != colmax) /* there are pixels not white */
{
if (magic_found == 4)
{
for (i= 0; i<8 ; i++)
{
if (*tmprowp & bitval[i])
{
x= byte_x*8+i;
if ( x >= xmax ) break;
#ifdef DEBUG
printf("(%04d,%04d): <not white>\n",y,x);
#endif
}
} /* end for */
} /* end if magic_found 4 */
else
{ /* assume PPM */
x= byte_x/3; /* we have 3 bytes per pixel */
#ifdef DEBUG
printf("(%04d,%04d)%04d: <not %d>\n",y,x,byte_x,colmax);
#endif
}
/* update bounding box */
if ( x < x_min ) x_min= x;
if ( x > x_max ) x_max= x;
if ( y < y_min ) y_min= y;
if ( y > y_max ) y_max= y;
#ifdef DEBUG
printf("ymin,ymax:(%04d,%04d) xmin,xmax:(%04d,%04d)",
y_min,y_max,x_min,x_max);
#endif
break; /* stop here */
} /* if there are pixels not white */
} /* end for byte_x */
if ( byte_x != byte_xmax )
{ /* there was a pixel with no background color */
tmprowp= image_row+byte_xmax-1;
/* inspect this line from the right */
for (byte_x= byte_xmax-1;
byte_x >= 0;
byte_x--,tmprowp--)
{
if ( *tmprowp != colmax ) /* there are pixels not white */
{
if ( magic_found == 4 )
{
for (i= 0; i<8 ; i++)
{
if ( *tmprowp & bitval[i] )
{
x= byte_x*8+i;
if (x >= xmax) break;
#ifdef DEBUG
printf("(%04d,%04d): <not white>\n",y,x);
#endif
}
} /* end for */
} /* end if magic_found 4 */
else
{ /* assume PPM */
x= byte_x/3; /* we have 3 bytes per pixel */
}
/* update bounding box */
if ( x < x_min ) x_min= x;
if ( x > x_max ) x_max= x;
if ( y < y_min ) y_min= y;
if ( y > y_max ) y_max= y;
break;
} /* if there are pixels not white */
} /* end for byte_x */
} /* if line contained not only background color */
} /* end for y */
#ifdef DEBUG_BOX
fprintf(stderr,"(%04d,%04d), (%04d,%04d)\n", x_min,ymax-y_max,x_max,ymax-y_min);
#endif
/* distance from the left edge to the leftmost point */
hllx= (x_min*72.0)/resolution;
/* distance from the bottom edge to the bottommost point */
hlly= ((ymax-y_max)*72.0)/resolution;
/* distance from the left edge to the righmost point */
hurx= (x_max*72.0)/resolution;
/* distance from the bottom edge to the uppermost point */
hury= ((ymax-y_min)*72.0)/resolution;
if ( !tight )
{
/* distance from the left edge to the leftmost point */
llx= minus_one((unsigned int) ((unsigned long) x_min*72UL)/resolution);
/* distance from the bottom edge to the bottommost point */
lly= minus_one((unsigned int) ((unsigned long) (ymax-y_max)*72UL)/resolution);
/* distance from the left edge to the righmost point */
urx= plus_one((unsigned int) ((unsigned long) x_max*72UL)/resolution);
/* distance from the bottom edge to the uppermost point */
ury= plus_one((unsigned int) ((unsigned long) (ymax-y_min)*72UL)/resolution);
}
else /* tight bounding box */
{
/* distance from the left edge to the leftmost point */
llx= (unsigned int) ((unsigned long) x_min*72UL)/resolution;
/* distance from the bottom edge to the bottommost point */
lly= (unsigned int) ((unsigned long) (ymax-y_max)*72UL)/resolution;
/* distance from the left edge to the righmost point */
urx= (unsigned int) ((unsigned long) x_max*72UL)/resolution;
if ( (((unsigned long) x_max*72UL) % resolution) != 0 )
urx= plus_one(urx);
/* distance from the bottom edge to the uppermost point */
ury= (unsigned int) ((unsigned long) (ymax-y_min)*72UL)/resolution;
if ( (((unsigned long) (y_max-y_min)*72UL) % resolution) != 0 )
ury= plus_one(ury);
}
/* skip the rest of the file if any data is still present */
while ( !feof(inputfile) )
{
fgets(inputline, 1024, inputfile);
}
/* give out Bounding Box */
printf("%%%%BoundingBox: %d %d %d %d\n", llx, lly, urx, ury);
printf("%%%%HiResBoundingBox: %f %f %f %f\n", hllx, hlly, hurx, hury);
}
else
fprintf(stderr,"%s: ERROR -- not enough memory to read in one row of the picture\n",prgname);
fclose(inputfile);
free(image_row);
}
int
main(int argc, char **argv)
{
int i;
char *filename= NULL;
unsigned int resolution= 72; /* use 72 dpi as default resolution */
unsigned char tight= 1;
for (i= 1; i<argc; i++)
{
if ( strcmp(argv[i],"-r") == 0 )
{
if (++i<argc)
resolution= atol(argv[i]);
else
fprintf(stderr,"%s: ERROR -- Missing resolution after -r\n",prgname);
}
else
if ( strcmp(argv[i],"-l") == 0 )
{
tight= 0;
}
else
if ( strcmp(argv[i],"-V") == 0 || strcmp(argv[i],"--version")==0 )
{
printf("%s: bbox Version %s\n",prgname,version);
return 0;
}
else
if ( strcmp(argv[i],"-h")==0 || strcmp(argv[i],"--help")==0 )
{
printf("%s: Version %s\n",prgname,version);
printf(" usage: %s [-l] [-r resolution] [-V] [filename]\n",prgname);
printf(" -l: loose bounding box (bbox is expanded by 1 point)\n");
printf(" -r: resolution of picture in dpi\n");
printf(" -V: version information\n");
printf(" -h: this help\n");
printf(" bbox reads a rawppm or rawpbm file and prints out the\n");
printf(" bounding box of the image. If no filename is specified\n");
printf(" input is read from standard input.\n");
return 0;
}
else
if ( argv[i][0] == '-' ) /* unkown option */
{
fprintf(stderr,"%s: ERROR -- unknown option %s\n call %s -h for help on usage\n",
prgname, argv[i], prgname);
return 1;
}
else /* filename argument */
filename= argv[i];
}
readppm_and_calcbb(filename, resolution, tight);
return 0;
}
|