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sane-project-backends/frontend/stiff.c

494 wiersze
13 KiB
C
Czysty Wina Historia

/* Create SANE/tiff headers TIFF interfacing routines for SANE
Copyright (C) 2000 Peter Kirchgessner
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
/* Changes:
2000-11-19, PK: Color TIFF-header: write 3 values for bits per sample
*/
#ifdef _AIX
# include <lalloca.h> /* MUST come first for AIX! */
#endif
#include <stdlib.h>
#include <stdio.h>
#include <sane/config.h>
#include <sane/sane.h>
typedef struct {
int tag, typ, nvals, val;
} IFD_ENTRY;
typedef struct {
int maxtags;
int ntags;
IFD_ENTRY *ifde;
} IFD;
#define IFDE_TYP_BYTE (1)
#define IFDE_TYP_ASCII (2)
#define IFDE_TYP_SHORT (3)
#define IFDE_TYP_LONG (4)
#define IFDE_TYP_RATIONAL (5)
static IFD *
create_ifd (void)
{ IFD *ifd;
int maxtags = 10;
ifd = (IFD *)malloc (sizeof (IFD));
if (ifd == NULL) return NULL;
ifd->ifde = (IFD_ENTRY *)malloc (maxtags * sizeof (IFD_ENTRY));
if (ifd->ifde == NULL)
{
free (ifd);
return NULL;
}
ifd->ntags = 0;
ifd->maxtags = maxtags;
return ifd;
}
static void
free_ifd (IFD *ifd)
{
if (ifd == NULL) return;
if (ifd->ifde != NULL)
{
free (ifd->ifde);
ifd->ifde = NULL;
}
free (ifd);
ifd = NULL;
}
static void
add_ifd_entry (IFD *ifd, int tag, int typ, int nvals, int val)
{ IFD_ENTRY *ifde;
int add_entries = 10;
if (ifd == NULL) return;
if (ifd->ntags == ifd->maxtags)
{
ifde = (IFD_ENTRY *)realloc (ifd->ifde,
(ifd->maxtags+add_entries)*sizeof (IFD_ENTRY));
if (ifde == NULL) return;
ifd->ifde = ifde;
ifd->maxtags += add_entries;
}
ifde = &(ifd->ifde[ifd->ntags]);
ifde->tag = tag;
ifde->typ = typ;
ifde->nvals = nvals;
ifde->val = val;
(ifd->ntags)++;
}
static void
write_i2 (FILE *fptr, int val, int motorola)
{
if (motorola)
{
putc ((val >> 8) & 0xff, fptr);
putc (val & 0xff, fptr);
}
else
{
putc (val & 0xff, fptr);
putc ((val >> 8) & 0xff, fptr);
}
}
static void
write_i4 (FILE *fptr, int val, int motorola)
{
if (motorola)
{
putc ((val >> 24) & 0xff, fptr);
putc ((val >> 16) & 0xff, fptr);
putc ((val >> 8) & 0xff, fptr);
putc (val & 0xff, fptr);
}
else
{
putc (val & 0xff, fptr);
putc ((val >> 8) & 0xff, fptr);
putc ((val >> 16) & 0xff, fptr);
putc ((val >> 24) & 0xff, fptr);
}
}
static void
write_ifd (FILE *fptr, IFD *ifd, int motorola)
{int k;
IFD_ENTRY *ifde;
if (!ifd) return;
if (motorola) putc ('M', fptr), putc ('M', fptr);
else putc ('I', fptr), putc ('I', fptr);
write_i2 (fptr, 42, motorola); /* Magic */
write_i4 (fptr, 8, motorola); /* Offset to first IFD */
write_i2 (fptr, ifd->ntags, motorola);
for (k = 0; k < ifd->ntags; k++)
{
ifde = &(ifd->ifde[k]);
write_i2 (fptr, ifde->tag, motorola);
write_i2 (fptr, ifde->typ, motorola);
write_i4 (fptr, ifde->nvals, motorola);
if ((ifde->typ == IFDE_TYP_SHORT) && (ifde->nvals == 1))
{
write_i2 (fptr, ifde->val, motorola);
write_i2 (fptr, 0, motorola);
}
else
{
write_i4 (fptr, ifde->val, motorola);
}
}
write_i4 (fptr, 0, motorola); /* End of IFD chain */
}
static void
write_tiff_bw_header (FILE *fptr, int width, int height, int resolution)
{IFD *ifd;
int header_size = 8, ifd_size;
int strip_offset, data_offset, data_size;
int strip_bytecount;
int ntags;
int motorola;
ifd = create_ifd ();
strip_bytecount = ((width+7)/8) * height;
/* the following values must be known in advance */
ntags = 11;
data_size = 0;
if (resolution > 0)
{
ntags += 3;
data_size += 2*4 + 2*4;
}
ifd_size = 2 + ntags*12 + 4;
data_offset = header_size + ifd_size;
strip_offset = data_offset + data_size;
/* New subfile type */
add_ifd_entry (ifd, 254, IFDE_TYP_LONG, 1, 0);
/* image width */
add_ifd_entry (ifd, 256, (width > 0xffff) ? IFDE_TYP_LONG : IFDE_TYP_SHORT,
1, width);
/* image length */
add_ifd_entry (ifd, 257, (height > 0xffff) ? IFDE_TYP_LONG : IFDE_TYP_SHORT,
1, height);
/* bits per sample */
add_ifd_entry (ifd, 258, IFDE_TYP_SHORT, 1, 1);
/* compression (uncompressed) */
add_ifd_entry (ifd, 259, IFDE_TYP_SHORT, 1, 1);
/* photometric interpretation */
add_ifd_entry (ifd, 262, IFDE_TYP_SHORT, 1, 0);
/* strip offset */
add_ifd_entry (ifd, 273, IFDE_TYP_LONG, 1, strip_offset);
/* orientation */
add_ifd_entry (ifd, 274, IFDE_TYP_SHORT, 1, 1);
/* samples per pixel */
add_ifd_entry (ifd, 277, IFDE_TYP_SHORT, 1, 1);
/* rows per strip */
add_ifd_entry (ifd, 278, IFDE_TYP_LONG, 1, height);
/* strip bytecount */
add_ifd_entry (ifd, 279, IFDE_TYP_LONG, 1, strip_bytecount);
if (resolution > 0)
{
/* x resolution */
add_ifd_entry (ifd, 282, IFDE_TYP_RATIONAL, 1, data_offset);
data_offset += 2*4;
/* y resolution */
add_ifd_entry (ifd, 283, IFDE_TYP_RATIONAL, 1, data_offset);
data_offset += 2*4;
}
if (resolution > 0)
{
/* resolution unit (dpi) */
add_ifd_entry (ifd, 296, IFDE_TYP_SHORT, 1, 2);
}
/* I prefer motorola format. Its human readable. */
motorola = 1;
write_ifd (fptr, ifd, motorola);
/* Write x/y resolution */
if (resolution > 0)
{
write_i4 (fptr, resolution, motorola);
write_i4 (fptr, 1, motorola);
write_i4 (fptr, resolution, motorola);
write_i4 (fptr, 1, motorola);
}
free_ifd (ifd);
}
static void
write_tiff_grey_header (FILE *fptr, int width, int height, int depth,
int resolution)
{IFD *ifd;
int header_size = 8, ifd_size;
int strip_offset, data_offset, data_size;
int strip_bytecount;
int ntags;
int motorola, bps, maxsamplevalue;
ifd = create_ifd ();
bps = (depth <= 8) ? 1 : 2; /* Bytes per sample */
maxsamplevalue = (depth <= 8) ? 255 : 65535;
strip_bytecount = width * height * bps;
/* the following values must be known in advance */
ntags = 13;
data_size = 0;
if (resolution > 0)
{
ntags += 3;
data_size += 2*4 + 2*4;
}
ifd_size = 2 + ntags*12 + 4;
data_offset = header_size + ifd_size;
strip_offset = data_offset + data_size;
/* New subfile type */
add_ifd_entry (ifd, 254, IFDE_TYP_LONG, 1, 0);
/* image width */
add_ifd_entry (ifd, 256, (width > 0xffff) ? IFDE_TYP_LONG : IFDE_TYP_SHORT,
1, width);
/* image length */
add_ifd_entry (ifd, 257, (height > 0xffff) ? IFDE_TYP_LONG : IFDE_TYP_SHORT,
1, height);
/* bits per sample */
add_ifd_entry (ifd, 258, IFDE_TYP_SHORT, 1, 8);
/* compression (uncompressed) */
add_ifd_entry (ifd, 259, IFDE_TYP_SHORT, 1, 1);
/* photometric interpretation */
add_ifd_entry (ifd, 262, IFDE_TYP_SHORT, 1, 1);
/* strip offset */
add_ifd_entry (ifd, 273, IFDE_TYP_LONG, 1, strip_offset);
/* orientation */
add_ifd_entry (ifd, 274, IFDE_TYP_SHORT, 1, 1);
/* samples per pixel */
add_ifd_entry (ifd, 277, IFDE_TYP_SHORT, 1, 1);
/* rows per strip */
add_ifd_entry (ifd, 278, IFDE_TYP_LONG, 1, height);
/* strip bytecount */
add_ifd_entry (ifd, 279, IFDE_TYP_LONG, 1, strip_bytecount);
/* min sample value */
add_ifd_entry (ifd, 280, IFDE_TYP_SHORT, 1, 0);
/* max sample value */
add_ifd_entry (ifd, 281, IFDE_TYP_SHORT, 1, maxsamplevalue);
if (resolution > 0)
{
/* x resolution */
add_ifd_entry (ifd, 282, IFDE_TYP_RATIONAL, 1, data_offset);
data_offset += 2*4;
/* y resolution */
add_ifd_entry (ifd, 283, IFDE_TYP_RATIONAL, 1, data_offset);
data_offset += 2*4;
}
if (resolution > 0)
{
/* resolution unit (dpi) */
add_ifd_entry (ifd, 296, IFDE_TYP_SHORT, 1, 2);
}
/* I prefer motorola format. Its human readable. But for 16 bit, */
/* the image format is defined by SANE to be the native byte order */
if (bps == 1)
{
motorola = 1;
}
else
{int check = 1;
motorola = ((*((char *)&check)) == 0);
}
write_ifd (fptr, ifd, motorola);
/* Write x/y resolution */
if (resolution > 0)
{
write_i4 (fptr, resolution, motorola);
write_i4 (fptr, 1, motorola);
write_i4 (fptr, resolution, motorola);
write_i4 (fptr, 1, motorola);
}
free_ifd (ifd);
}
static void
write_tiff_color_header (FILE *fptr, int width, int height, int depth,
int resolution)
{IFD *ifd;
int header_size = 8, ifd_size;
int strip_offset, data_offset, data_size;
int strip_bytecount;
int ntags;
int motorola, bps, maxsamplevalue;
ifd = create_ifd ();
bps = (depth <= 8) ? 1 : 2; /* Bytes per sample */
maxsamplevalue = (depth <= 8) ? 255 : 65535;
strip_bytecount = width * height * 3 * bps;
/* the following values must be known in advance */
ntags = 13;
data_size = 3*2 + 3*2 + 3*2;
if (resolution > 0)
{
ntags += 3;
data_size += 2*4 + 2*4;
}
ifd_size = 2 + ntags*12 + 4;
data_offset = header_size + ifd_size;
strip_offset = data_offset + data_size;
/* New subfile type */
add_ifd_entry (ifd, 254, IFDE_TYP_LONG, 1, 0);
/* image width */
add_ifd_entry (ifd, 256, (width > 0xffff) ? IFDE_TYP_LONG : IFDE_TYP_SHORT,
1, width);
/* image length */
add_ifd_entry (ifd, 257, (height > 0xffff) ? IFDE_TYP_LONG : IFDE_TYP_SHORT,
1, height);
/* bits per sample */
add_ifd_entry (ifd, 258, IFDE_TYP_SHORT, 3, data_offset);
data_offset += 3*2;
/* compression (uncompressed) */
add_ifd_entry (ifd, 259, IFDE_TYP_SHORT, 1, 1);
/* photometric interpretation */
add_ifd_entry (ifd, 262, IFDE_TYP_SHORT, 1, 2);
/* strip offset */
add_ifd_entry (ifd, 273, IFDE_TYP_LONG, 1, strip_offset);
/* orientation */
add_ifd_entry (ifd, 274, IFDE_TYP_SHORT, 1, 1);
/* samples per pixel */
add_ifd_entry (ifd, 277, IFDE_TYP_SHORT, 1, 3);
/* rows per strip */
add_ifd_entry (ifd, 278, IFDE_TYP_LONG, 1, height);
/* strip bytecount */
add_ifd_entry (ifd, 279, IFDE_TYP_LONG, 1, strip_bytecount);
/* min sample value */
add_ifd_entry (ifd, 280, IFDE_TYP_SHORT, 3, data_offset);
data_offset += 3*2;
/* max sample value */
add_ifd_entry (ifd, 281, IFDE_TYP_SHORT, 3, data_offset);
data_offset += 3*2;
if (resolution > 0)
{
/* x resolution */
add_ifd_entry (ifd, 282, IFDE_TYP_RATIONAL, 1, data_offset);
data_offset += 2*4;
/* y resolution */
add_ifd_entry (ifd, 283, IFDE_TYP_RATIONAL, 1, data_offset);
data_offset += 2*4;
}
if (resolution > 0)
{
/* resolution unit (dpi) */
add_ifd_entry (ifd, 296, IFDE_TYP_SHORT, 1, 2);
}
/* I prefer motorola format. Its human readable. But for 16 bit, */
/* the image format is defined by SANE to be the native byte order */
if (bps == 1)
{
motorola = 1;
}
else
{int check = 1;
motorola = ((*((char *)&check)) == 0);
}
write_ifd (fptr, ifd, motorola);
/* Write bits per sample value values */
write_i2 (fptr, depth, motorola);
write_i2 (fptr, depth, motorola);
write_i2 (fptr, depth, motorola);
/* Write min sample value values */
write_i2 (fptr, 0, motorola);
write_i2 (fptr, 0, motorola);
write_i2 (fptr, 0, motorola);
/* Write max sample value values */
write_i2 (fptr, maxsamplevalue, motorola);
write_i2 (fptr, maxsamplevalue, motorola);
write_i2 (fptr, maxsamplevalue, motorola);
/* Write x/y resolution */
if (resolution > 0)
{
write_i4 (fptr, resolution, motorola);
write_i4 (fptr, 1, motorola);
write_i4 (fptr, resolution, motorola);
write_i4 (fptr, 1, motorola);
}
free_ifd (ifd);
}
void
sanei_write_tiff_header (SANE_Frame format, int width, int height, int depth,
int resolution)
{
#ifdef __EMX__ /* OS2 - write in binary mode. */
_fsetmode(stdout, "b");
#endif
switch (format)
{
case SANE_FRAME_RED:
case SANE_FRAME_GREEN:
case SANE_FRAME_BLUE:
case SANE_FRAME_RGB:
write_tiff_color_header (stdout, width, height, depth, resolution);
break;
default:
if (depth == 1)
write_tiff_bw_header (stdout, width, height, resolution);
else
write_tiff_grey_header (stdout, width, height, depth, resolution);
break;
}
}
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