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98 lines
2.5 KiB
C
98 lines
2.5 KiB
C
/*
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* io-tiff.c: GdkPixBuf I/O for TIFF files.
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* Copyright (C) 1999 Mark Crichton
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* Author: Mark Crichton <crichton@gimp.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Cambridge, MA 02139, USA.
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*
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*/
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/* Following code (almost) blatantly ripped from Imlib */
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#include <config.h>
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#include <stdio.h>
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#include <string.h>
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#include <glib.h>
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#include <tiffio.h>
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#include "gdk-pixbuf.h"
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/*#include "gdk-pixbuf-io.h" */
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GdkPixBuf *image_load(FILE * f)
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{
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GdkPixBuf *pixbuf;
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TIFF *tiff;
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art_u8 *pixels, *tmppix;
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gint w, h, x, y, num_pixs, fd;
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uint32 *rast, *tmp_rast;
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g_return_val_if_fail(f != NULL, NULL);
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fd = fileno(f);
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tiff = TIFFFdOpen(fd, "libpixbuf-tiff", "r");
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if (!tiff)
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return NULL;
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TIFFGetField(tiff, TIFFTAG_IMAGEWIDTH, &w);
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TIFFGetField(tiff, TIFFTAG_IMAGELENGTH, &h);
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num_pixs = w * h;
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/* Yes, it needs to be _TIFFMalloc... */
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rast = (uint32 *) _TIFFmalloc(num_pixs * sizeof(uint32));
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if (!rast) {
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TIFFClose(tiff);
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return NULL;
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}
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if (TIFFReadRGBAImage(tiff, w, h, rast, 0)) {
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pixels = art_alloc(num_pixs * 4);
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if (!pixels) {
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_TIFFfree(rast);
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TIFFClose(tiff);
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return NULL;
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}
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tmppix = pixels;
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for (y = 0; y < h; y++) {
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/* Unexplainable...are tiffs backwards? */
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/* Also looking at the GIMP plugin, this
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* whole reading thing can be a bit more
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* robust.
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*/
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tmp_rast = rast + ((h - y - 1) * w);
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for (x = 0; x < w; x++) {
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tmppix[0] = TIFFGetR(*tmp_rast);
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tmppix[1] = TIFFGetG(*tmp_rast);
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tmppix[2] = TIFFGetB(*tmp_rast);
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tmppix[3] = TIFFGetA(*tmp_rast);
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tmp_rast++;
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tmppix += 4;
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}
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}
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}
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_TIFFfree(rast);
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TIFFClose(tiff);
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pixbuf = gdk_pixbuf_new (art_pixbuf_new_rgba (pixels, w, h, (w * 4)),
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NULL);
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if (!pixbuf)
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art_free (pixels);
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return pixbuf;
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}
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