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/* tiff.c - load TIFF image from file
*
* Raster graphics library
*
* Copyright (c) 1997-2003 Alfredo K. Kojima
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
#include <config.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <tiff.h>
#include <tiffio.h>
#include <tiffvers.h>
#include "wraster.h"
#include "imgformat.h"
#include "wr_i18n.h"
RImage *RLoadTIFF(const char *file, int index)
{
RImage *image = NULL;
TIFF *tif;
int i, ch;
unsigned char *r, *g, *b, *a;
#if TIFFLIB_VERSION < 20210416
uint16 alpha, amode, extrasamples;
uint16 *sampleinfo;
uint32 width, height;
uint32 *data, *ptr;
#else
uint16_t alpha, amode, extrasamples;;
uint16_t *sampleinfo;
uint32_t width, height;
uint32_t *data, *ptr;
#endif
tif = TIFFOpen(file, "r");
if (!tif)
return NULL;
/* seek index */
i = index;
while (i > 0) {
if (!TIFFReadDirectory(tif)) {
RErrorCode = RERR_BADINDEX;
TIFFClose(tif);
return NULL;
}
i--;
}
/* get info */
TIFFGetField(tif, TIFFTAG_IMAGEWIDTH, &width);
TIFFGetField(tif, TIFFTAG_IMAGELENGTH, &height);
TIFFGetFieldDefaulted(tif, TIFFTAG_EXTRASAMPLES, &extrasamples, &sampleinfo);
alpha = (extrasamples == 1 &&
((sampleinfo[0] == EXTRASAMPLE_ASSOCALPHA) || (sampleinfo[0] == EXTRASAMPLE_UNASSALPHA)));
amode = (extrasamples == 1 && sampleinfo[0] == EXTRASAMPLE_ASSOCALPHA);
if (width < 1 || height < 1) {
RErrorCode = RERR_BADIMAGEFILE;
TIFFClose(tif);
return NULL;
}
/* read data */
#if TIFFLIB_VERSION < 20210416
ptr = data = (uint32 *) _TIFFmalloc(width * height * sizeof(uint32));
#else
ptr = data = (uint32_t *) _TIFFmalloc(width * height * sizeof(uint32_t));
#endif
if (!data) {
RErrorCode = RERR_NOMEMORY;
} else {
if (!TIFFReadRGBAImage(tif, width, height, data, 0)) {
RErrorCode = RERR_BADIMAGEFILE;
} else {
/* convert data */
image = RCreateImage(width, height, alpha);
if (alpha)
ch = 4;
else
ch = 3;
if (image) {
int x, y;
r = image->data;
g = image->data + 1;
b = image->data + 2;
a = image->data + 3;
/* data seems to be stored upside down */
data += width * (height - 1);
for (y = 0; y < height; y++) {
for (x = 0; x < width; x++) {
*(r) = (*data) & 0xff;
*(g) = (*data >> 8) & 0xff;
*(b) = (*data >> 16) & 0xff;
if (alpha) {
*(a) = (*data >> 24) & 0xff;
if (amode && (*a > 0)) {
*r = (*r * 255) / *(a);
*g = (*g * 255) / *(a);
*b = (*b * 255) / *(a);
}
a += 4;
}
r += ch;
g += ch;
b += ch;
data++;
}
data -= 2 * width;
}
}
}
_TIFFfree(ptr);
}
TIFFClose(tif);
return image;
}
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