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/* GdkPixbuf library - JPEG image loader
*
* Copyright (C) 1999 Mark Crichton
* Copyright (C) 1999 The Free Software Foundation
*
* Authors: Mark Crichton <crichton@gimp.org>
* Federico Mena-Quintero <federico@gimp.org>
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/* Following code (almost) blatantly ripped from Imlib */
#include <config.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <tiffio.h>
#include "gdk-pixbuf.h"
#include "gdk-pixbuf-io.h"
typedef struct _TiffData TiffData;
struct _TiffData
{
ModulePreparedNotifyFunc prepare_func;
ModuleUpdatedNotifyFunc update_func;
gpointer user_data;
gchar *tempname;
FILE *file;
gboolean all_okay;
};
GdkPixbuf *
image_load_real (FILE *f, TiffData *context)
{
TIFF *tiff;
guchar *pixels = NULL;
guchar *tmppix;
gint w, h, x, y, num_pixs, fd;
uint32 *rast, *tmp_rast;
GdkPixbuf *pixbuf;
fd = fileno (f);
tiff = TIFFFdOpen (fd, "libpixbuf-tiff", "r");
if (!tiff)
return NULL;
TIFFGetField (tiff, TIFFTAG_IMAGEWIDTH, &w);
TIFFGetField (tiff, TIFFTAG_IMAGELENGTH, &h);
num_pixs = w * h;
pixbuf = gdk_pixbuf_new (ART_PIX_RGB, TRUE, 8, w, h);
if (context)
(* context->prepare_func) (pixbuf, context->user_data);
/* Yes, it needs to be _TIFFMalloc... */
rast = (uint32 *) _TIFFmalloc (num_pixs * sizeof (uint32));
if (!rast) {
TIFFClose (tiff);
return NULL;
}
if (TIFFReadRGBAImage (tiff, w, h, rast, 0)) {
pixels = gdk_pixbuf_get_pixels (pixbuf);
if (!pixels) {
_TIFFfree (rast);
TIFFClose (tiff);
return NULL;
}
tmppix = pixels;
for (y = 0; y < h; y++) {
/* Unexplainable...are tiffs backwards? */
/* Also looking at the GIMP plugin, this
* whole reading thing can be a bit more
* robust.
*/
tmp_rast = rast + ((h - y - 1) * w);
for (x = 0; x < w; x++) {
tmppix[0] = TIFFGetR (*tmp_rast);
tmppix[1] = TIFFGetG (*tmp_rast);
tmppix[2] = TIFFGetB (*tmp_rast);
tmppix[3] = TIFFGetA (*tmp_rast);
tmp_rast++;
tmppix += 4;
}
}
}
_TIFFfree (rast);
TIFFClose (tiff);
if (context) {
gdk_pixbuf_unref (pixbuf);
(* context->update_func) (pixbuf, context->user_data, 0, 0, w, h);
}
return pixbuf;
}
/* Static loader */
GdkPixbuf *
image_load (FILE *f)
{
return image_load_real (f, NULL);
}
/* Progressive loader */
/*
* Tiff loading progressively cannot be done. We write it to a file, then load
* the file when it's done. It's not pretty.
*/
gpointer
image_begin_load (ModulePreparedNotifyFunc prepare_func,
ModuleUpdatedNotifyFunc update_func,
gpointer user_data)
{
TiffData *context;
gint fd;
context = g_new (TiffData, 1);
context->prepare_func = prepare_func;
context->update_func = update_func;
context->user_data = user_data;
context->all_okay = TRUE;
context->tempname = g_strdup ("/tmp/gdkpixbuf-tif-tmp.XXXXXX");
fd = mkstemp (context->tempname);
if (fd < 0) {
g_free (context);
return NULL;
}
context->file = fdopen (fd, "w");
if (context->file == NULL) {
g_free (context);
return NULL;
}
return context;
}
void
image_stop_load (gpointer data)
{
TiffData *context = (TiffData*) data;
g_return_if_fail (data != NULL);
fflush (context->file);
rewind (context->file);
if (context->all_okay)
image_load_real (context->file, context);
fclose (context->file);
unlink (context->tempname);
g_free ((TiffData *) context);
}
gboolean
image_load_increment (gpointer data, guchar *buf, guint size)
{
TiffData *context = (TiffData *) data;
g_return_val_if_fail (data != NULL, FALSE);
if (fwrite (buf, sizeof (guchar), size, context->file) != size) {
context->all_okay = FALSE;
return FALSE;
}
return TRUE;
}
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