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/*
* TIFFIO.C -- Routines to save a simple TIFF 6.0 format file. Loading is
* not supported due to the complexity of the format.
*
* writeTIFF (fa, data, w, h, ncolors, gray, r, g, b)
*/
#include <stdio.h>
#ifdef ULTRIX
#include <sys/types.h>
#endif
#include <unistd.h>
/* TIFF Tag description
*/
typedef struct {
short tag;
short type;
int count;
int offset;
} TiffTag;
typedef struct {
unsigned short red[256];
unsigned short green[256];
unsigned short blue[256];
} Colors;
static char *h_order = "MM\0*";
static char *l_order = "II*\0";
/* Tag Definitions */
#define IMAGEWIDTH 256
#define IMAGELENGTH 257
#define BITSPERSAMPLE 258
#define COMPRESSION 259
#define PHOTOMETRIC 262
#define STRIPOFFSETS 273
#define ROWSPERSTRIP 278
#define STRIPBYTECOUNT 279
#define XRESOLUTION 282
#define YRESOLUTION 283
#define RESOLUTIONUNIT 296
#define COLORMAP 320
#define MAXCOLORS 256
/* MONO returns total intensity of r,g,b components */
#define MONO(rd,gn,bl) (((rd)*11 + (gn)*16 + (bl)*5) >> 5) /*.33R+ .5G+ .17B*/
/* writeTIFF -- Write a TIFF 6.0 image.
*/
writeTIFF (fa, data, w, h, ncolors, gray, r, g, b)
FILE *fa; /* output file descriptor */
unsigned char *data; /* pixel data */
int w, h; /* image dimensions */
int ncolors; /* number of colors */
int gray; /* grayscale? */
unsigned char *r, *g, *b; /* colormap */
{
int i,size,offset;
short dirs = 12;
TiffTag *tt;
unsigned char *dta, r1, b1, g1;
unsigned short *rr, *gg, *bb;
int bitspersample=8, compression=1, photo=3, resolution=2;
int width = w, height = h;
tt = (TiffTag *) calloc (dirs, sizeof(TiffTag));
size = w * h;
dta = (unsigned char *) calloc (size+(size%4), sizeof(unsigned char));
rr = (unsigned short *) calloc (MAXCOLORS, sizeof(unsigned short));
gg = (unsigned short *) calloc (MAXCOLORS, sizeof(unsigned short));
bb = (unsigned short *) calloc (MAXCOLORS, sizeof(unsigned short));
memcpy(dta, data, size * sizeof(unsigned char));
if (is_swapped()) {
fwrite (l_order, 4, 1, fa);
} else {
fwrite (h_order, 4, 1, fa);
width = w << 16;
height = h << 16;
bitspersample <<= 16;
compression <<= 16;
photo <<= 16;
resolution <<= 16;
}
offset = 8;
fwrite (&offset, 4, 1, fa);
fwrite (&dirs, 2, 1, fa); /* number of IFD's */
/* Create TIFF IFD's.
*/
create_TIFFtag (tt+0, IMAGEWIDTH, 3, 1, (width));
create_TIFFtag (tt+1, IMAGELENGTH, 3, 1, (height));
create_TIFFtag (tt+2, BITSPERSAMPLE, 3, 1, (bitspersample));
create_TIFFtag (tt+3, COMPRESSION, 3, 1, (compression));
create_TIFFtag (tt+4, PHOTOMETRIC, 3, 1, (photo));
create_TIFFtag (tt+5, STRIPOFFSETS, 4, 1, 10+(dirs*12)+4);
create_TIFFtag (tt+6, ROWSPERSTRIP, 3, 1, (width));
create_TIFFtag (tt+7, STRIPBYTECOUNT, 4, 1, size);
create_TIFFtag (tt+8, XRESOLUTION, 5, 1,
(tt+5)->offset+(2*768)+(size+(size%4)));
create_TIFFtag (tt+9, YRESOLUTION, 5, 1,
(tt+5)->offset+(2*768)+(size+(size%4))+8);
create_TIFFtag (tt+10, RESOLUTIONUNIT, 3, 1, (resolution));
create_TIFFtag (tt+11, COLORMAP, 3, 768,
(tt+5)->offset+(size+(size%4)));
/* Write header info and tags.
*/
for (i = 0 ; i < dirs ; i++) {
fwrite ((tt+i), 12, 1, fa);
}
/* Write a 4-byte NULL -- this tells the TIFF reader that there
* are no more IFD's.
*/
i = 0;
fwrite (&i, 4, 1, fa);
/* Write data.
*/
fwrite (dta, size+(size%4), 1, fa);
/* Create unsigned short colormap.
*/
for (i = 0 ; i < ncolors ; i++) {
if (gray) {
r1 = (unsigned char) MONO (*(r+i),*(g+i),*(b+i));
g1 = (unsigned char) MONO (*(r+i),*(g+i),*(b+i));
b1 = (unsigned char) MONO (*(r+i),*(g+i),*(b+i));
*(r+i) = r1;
*(g+i) = g1;
*(b+i) = b1;
}
*(rr+i) = (unsigned short) *(r+i) | ((unsigned short) *(r+i) << 8);
*(gg+i) = (unsigned short) *(g+i) | ((unsigned short) *(g+i) << 8);
*(bb+i) = (unsigned short) *(b+i) | ((unsigned short) *(b+i) << 8);
}
/* Fill in the rest of the colortable with 0xffff's.
*/
for (i = ncolors ; i < MAXCOLORS ; i++) {
*(rr+i) = (unsigned short) 0xffff;
*(gg+i) = (unsigned short) 0xffff;
*(bb+i) = (unsigned short) 0xffff;
}
/* Write out colormap.
*/
fwrite (rr, MAXCOLORS*sizeof(unsigned short), 1, fa);
fwrite (gg, MAXCOLORS*sizeof(unsigned short), 1, fa);
fwrite (bb, MAXCOLORS*sizeof(unsigned short), 1, fa);
/* Write the XResolution.
*/
i = 1;
fwrite (&i, sizeof(int), 1, fa);
fwrite (&i, sizeof(int), 1, fa);
/* Write the YResolution.
*/
i = 1;
fwrite (&i, sizeof(int), 1, fa);
fwrite (&i, sizeof(int), 1, fa);
/* Free memory.
*/
free (tt);
free (dta);
free (rr);
free (gg);
free (bb);
}
/* create_TIFFtag - Create a TIFF IFD (Image File Directory).
*/
create_TIFFtag (tag, desig, type, count, offset)
TiffTag *tag; /* tag to create */
short desig; /* tag definition */
short type; /* scalar type of data items */
int count; /* no. of items in tag data */
int offset; /* byte offset to data items */
{
tag->tag = desig;
tag->type = type;
tag->count = count;
tag->offset = offset;
}
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