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/*
This file is part of libextractor.
(C) 2005, 2009 Vidyut Samanta and Christian Grothoff
libextractor is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 2, or (at your
option) any later version.
libextractor 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with libextractor; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
/**
* @file thumbnailextractor.c
* @author Christian Grothoff
* @brief this extractor produces a binary (!) encoded
* thumbnail of images (using gdk pixbuf). The bottom
* of the file includes a decoder method that can be used
* to reproduce the 128x128 PNG thumbnails.
*/
#include "platform.h"
#include "extractor.h"
#include <glib.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#define THUMBSIZE 128
/* using libgobject, needs init! */
void __attribute__ ((constructor)) ole_gobject_init ()
{
g_type_init ();
}
const char *
EXTRACTOR_thumbnailgtk_options ()
{
/*
Since the Gnome developers think that being unable to
unload plugins is an 'acceptable' limitation, we
require out-of-process execution for plugins depending
on libgsf and other glib-based plugins.
See also https://bugzilla.gnome.org/show_bug.cgi?id=374940
*/
return "oop-only";
}
int
EXTRACTOR_thumbnailgtk_extract (const char *data,
size_t size,
EXTRACTOR_MetaDataProcessor proc,
void *proc_cls,
const char *options)
{
GdkPixbufLoader *loader;
GdkPixbuf *in;
GdkPixbuf *out;
size_t length;
char *thumb;
unsigned long width;
unsigned long height;
char format[64];
int ret;
loader = gdk_pixbuf_loader_new ();
gdk_pixbuf_loader_write (loader,
(const unsigned char*) data,
size, NULL);
in = gdk_pixbuf_loader_get_pixbuf (loader);
gdk_pixbuf_loader_close (loader, NULL);
if (in == NULL)
{
g_object_unref (loader);
return 0;
}
g_object_ref (in);
g_object_unref (loader);
height = gdk_pixbuf_get_height (in);
width = gdk_pixbuf_get_width (in);
snprintf (format,
sizeof(format),
"%ux%u",
(unsigned int) width,
(unsigned int) height);
if (0 != proc (proc_cls,
"thumbnailgtk",
EXTRACTOR_METATYPE_IMAGE_DIMENSIONS,
EXTRACTOR_METAFORMAT_UTF8,
"text/plain",
format,
strlen (format) + 1))
{
g_object_unref (in);
return 1;
}
if ((height <= THUMBSIZE) && (width <= THUMBSIZE))
{
g_object_unref (in);
return 0;
}
if (height > THUMBSIZE)
{
width = width * THUMBSIZE / height;
height = THUMBSIZE;
}
if (width > THUMBSIZE)
{
height = height * THUMBSIZE / width;
width = THUMBSIZE;
}
if ( (height == 0) || (width == 0) )
{
g_object_unref (in);
return 0;
}
out = gdk_pixbuf_scale_simple (in, width, height, GDK_INTERP_BILINEAR);
g_object_unref (in);
thumb = NULL;
length = 0;
if (out == NULL)
return 0;
if (!gdk_pixbuf_save_to_buffer (out, &thumb, &length, "png", NULL,
"compression", "9", NULL))
{
g_object_unref (out);
return 0;
}
g_object_unref (out);
if (thumb == NULL)
return 0;
ret = proc (proc_cls,
"thumbnailgtk",
EXTRACTOR_METATYPE_THUMBNAIL,
EXTRACTOR_METAFORMAT_BINARY,
"image/png",
thumb, length);
free (thumb);
return ret;
}
int
EXTRACTOR_thumbnail_extract (const char *data,
size_t size,
EXTRACTOR_MetaDataProcessor proc,
void *proc_cls,
const char *options)
{
return EXTRACTOR_thumbnailgtk_extract (data, size, proc, proc_cls, options);
}
/* end of thumbnailgtk_extractor.c */
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