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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <tiffio.h>
#include "readers.h"
struct tiff_state {
TIFF* tif;
char emsg[1024];
tdir_t ndirs; /* Number of directories */
/* (could be interpreted as number of pages) */
uint32 width,height;
uint16 config,nsamples,depth,fillorder,photometric;
uint32* row;
uint32* image;
uint16 resunit;
float xres,yres;
};
static void*
tiff_init(FILE *fp, char *filename, unsigned int page,
struct ida_image_info *i, int thumbnail)
{
struct tiff_state *h;
fclose(fp);
h = malloc(sizeof(*h));
memset(h,0,sizeof(*h));
TIFFSetWarningHandler(NULL);
h->tif = TIFFOpen(filename,"r");
if (NULL == h->tif)
goto oops;
/* Determine number of directories */
h->ndirs = 1;
while (TIFFReadDirectory(h->tif))
h->ndirs++;
i->npages = h->ndirs;
/* Select requested directory (page) */
if (!TIFFSetDirectory(h->tif, (tdir_t)page))
goto oops;
TIFFGetField(h->tif, TIFFTAG_IMAGEWIDTH, &h->width);
TIFFGetField(h->tif, TIFFTAG_IMAGELENGTH, &h->height);
TIFFGetField(h->tif, TIFFTAG_PLANARCONFIG, &h->config);
TIFFGetField(h->tif, TIFFTAG_SAMPLESPERPIXEL, &h->nsamples);
TIFFGetField(h->tif, TIFFTAG_BITSPERSAMPLE, &h->depth);
TIFFGetField(h->tif, TIFFTAG_FILLORDER, &h->fillorder);
TIFFGetField(h->tif, TIFFTAG_PHOTOMETRIC, &h->photometric);
h->row = malloc(TIFFScanlineSize(h->tif));
if (debug)
fprintf(stderr,"tiff: %" PRId32 "x%" PRId32 ", planar=%d, "
"nsamples=%d, depth=%d fo=%d pm=%d scanline=%" PRId32 "\n",
h->width,h->height,h->config,h->nsamples,h->depth,
h->fillorder,h->photometric,
(uint32_t)TIFFScanlineSize(h->tif));
if (PHOTOMETRIC_PALETTE == h->photometric ||
PHOTOMETRIC_YCBCR == h->photometric ||
PHOTOMETRIC_SEPARATED == h->photometric ||
TIFFIsTiled(h->tif) ||
(1 != h->depth && 8 != h->depth)) {
/* for the more difficuilt cases we let libtiff
* do all the hard work. Drawback is that we lose
* progressive loading and decode everything here */
if (debug)
fprintf(stderr,"tiff: reading whole image [TIFFReadRGBAImage]\n");
h->image=malloc(4*h->width*h->height);
TIFFReadRGBAImage(h->tif, h->width, h->height, h->image, 0);
} else {
if (debug)
fprintf(stderr,"tiff: reading scanline by scanline\n");
h->row = malloc(TIFFScanlineSize(h->tif));
}
i->width = h->width;
i->height = h->height;
if (TIFFGetField(h->tif, TIFFTAG_RESOLUTIONUNIT, &h->resunit) &&
TIFFGetField(h->tif, TIFFTAG_XRESOLUTION, &h->xres) &&
TIFFGetField(h->tif, TIFFTAG_YRESOLUTION, &h->yres)) {
switch (h->resunit) {
case RESUNIT_NONE:
break;
case RESUNIT_INCH:
i->dpi = h->xres;
break;
case RESUNIT_CENTIMETER:
i->dpi = res_cm_to_inch(h->xres);
break;
}
}
return h;
oops:
if (h->tif)
TIFFClose(h->tif);
free(h);
return NULL;
}
static void
tiff_read(unsigned char *dst, unsigned int line, void *data)
{
struct tiff_state *h = data;
int s,on,off;
if (h->image) {
/* loaded whole image using TIFFReadRGBAImage() */
uint32 *row = h->image + h->width * (h->height - line -1);
load_rgba(dst,(unsigned char*)row,h->width);
return;
}
if (h->config == PLANARCONFIG_CONTIG) {
TIFFReadScanline(h->tif, h->row, line, 0);
} else if (h->config == PLANARCONFIG_SEPARATE) {
for (s = 0; s < h->nsamples; s++)
TIFFReadScanline(h->tif, h->row, line, s);
}
switch (h->nsamples) {
case 1:
if (1 == h->depth) {
/* black/white */
on = 0, off = 0;
if (PHOTOMETRIC_MINISWHITE == h->photometric)
on = 0, off = 255;
if (PHOTOMETRIC_MINISBLACK == h->photometric)
on = 255, off = 0;
#if 0
/* Huh? Does TIFFReadScanline handle this already ??? */
if (FILLORDER_MSB2LSB == h->fillorder)
load_bits_msb(dst,(unsigned char*)(h->row),h->width,on,off);
else
load_bits_lsb(dst,(unsigned char*)(h->row),h->width,on,off);
#else
load_bits_msb(dst,(unsigned char*)(h->row),h->width,on,off);
#endif
} else {
/* grayscaled */
load_gray(dst,(unsigned char*)(h->row),h->width);
}
break;
case 3:
/* rgb */
memcpy(dst,h->row,3*h->width);
break;
case 4:
/* rgb+alpha */
load_rgba(dst,(unsigned char*)(h->row),h->width);
break;
}
}
static void
tiff_done(void *data)
{
struct tiff_state *h = data;
TIFFClose(h->tif);
if (h->row)
free(h->row);
if (h->image)
free(h->image);
free(h);
}
static struct ida_loader tiff1_loader = {
magic: "MM\x00\x2a",
moff: 0,
mlen: 4,
name: "libtiff",
init: tiff_init,
read: tiff_read,
done: tiff_done,
};
static struct ida_loader tiff2_loader = {
magic: "II\x2a\x00",
moff: 0,
mlen: 4,
name: "libtiff",
init: tiff_init,
read: tiff_read,
done: tiff_done,
};
static void __init init_rd(void)
{
load_register(&tiff1_loader);
load_register(&tiff2_loader);
}
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