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livetrax/libs/tk/ydk-pixbuf/io-pixdata.c

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/* GdkPixdata loader
*
* Copyright (c) 2012 Alexander Larsson <alexl@redhat.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "gdk-pixbuf-private.h"
#include "gdk-pixdata.h"
G_MODULE_EXPORT void fill_vtable (GdkPixbufModule * module);
G_MODULE_EXPORT void fill_info (GdkPixbufFormat * info);
struct pixdata_context {
GdkPixbufModuleSizeFunc size_func;
GdkPixbufModuleUpdatedFunc updated_func;
GdkPixbufModulePreparedFunc prepared_func;
gpointer user_data;
GString *data;
GdkPixdata pixdata;
gboolean got_header;
gboolean got_pixbuf;
};
static void
free_pixdata_context (struct pixdata_context *context)
{
if (!context)
return;
g_free (context);
}
static gpointer
pixdata_image_begin_load (GdkPixbufModuleSizeFunc size_func,
GdkPixbufModulePreparedFunc prepared_func,
GdkPixbufModuleUpdatedFunc updated_func,
gpointer user_data, GError **error)
{
struct pixdata_context *context;
context = g_new0 (struct pixdata_context, 1);
if (!context)
return NULL;
context->size_func = size_func;
context->updated_func = updated_func;
context->prepared_func = prepared_func;
context->user_data = user_data;
context->data = g_string_new ("");
return context;
}
static gboolean try_load (struct pixdata_context *context, GError **error)
{
GdkPixbuf *pixbuf;
if (context->got_pixbuf)
return TRUE;
if (!gdk_pixdata_deserialize (&context->pixdata,
context->data->len,
(guchar *)context->data->str,
error))
return FALSE;
pixbuf = gdk_pixbuf_from_pixdata (&context->pixdata,
TRUE, error);
if (pixbuf == NULL)
return FALSE;
context->got_pixbuf = TRUE;
if (context->prepared_func)
(* context->prepared_func) (pixbuf,
NULL,
context->user_data);
if (context->updated_func)
(* context->updated_func) (pixbuf, 0, 0, pixbuf->width, pixbuf->height, context->user_data);
return TRUE;
}
static gboolean
pixdata_image_stop_load (gpointer data, GError **error)
{
struct pixdata_context *context = (struct pixdata_context *) data;
gboolean res;
res = try_load (context, error);
g_string_free (context->data, TRUE);
free_pixdata_context (context);
return res;
}
static gboolean
pixdata_image_load_increment (gpointer data, const guchar *buf, guint size, GError **error)
{
struct pixdata_context *context = (struct pixdata_context *) data;
g_string_append_len (context->data, (char *)buf, size);
if (!context->got_header && context->data->len >= GDK_PIXDATA_HEADER_LENGTH)
{
/* This never reads past the header anyway, and we know we have at least
the header size, so we pass it a really large size to avoid any error reporting
due to missing data */
if (!gdk_pixdata_deserialize (&context->pixdata,
G_MAXUINT,
(guchar *)context->data->str,
error))
return FALSE;
context->got_header = TRUE;
if (context->size_func)
{
gint w = context->pixdata.width;
gint h = context->pixdata.height;
(* context->size_func) (&w, &h, context->user_data);
if (w == 0 || h == 0)
{
g_set_error_literal (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_FAILED,
_("Transformed pixbuf has zero width or height."));
return FALSE;
}
}
}
try_load (context, NULL);
return TRUE;
}
/* Always included */
#define MODULE_ENTRY(function) void _gdk_pixbuf__pixdata_ ## function
MODULE_ENTRY (fill_vtable) (GdkPixbufModule * module)
{
module->begin_load = pixdata_image_begin_load;
module->stop_load = pixdata_image_stop_load;
module->load_increment = pixdata_image_load_increment;
}
MODULE_ENTRY (fill_info) (GdkPixbufFormat * info)
{
static const GdkPixbufModulePattern signature[] = {
{ "GdkP", NULL, 100 }, /* file begins with 'GdkP' at offset 0 */
{ NULL, NULL, 0 }
};
static const gchar *mime_types[] = {
"image/x-gdkpixdata",
NULL
};
static const gchar *extensions[] = {
"gdkp",
NULL
};
info->name = "GdkPixdata";
info->signature = (GdkPixbufModulePattern *) signature;
info->description = N_("The GdkPixdata format");
info->mime_types = (gchar **) mime_types;
info->extensions = (gchar **) extensions;
info->flags = GDK_PIXBUF_FORMAT_THREADSAFE;
info->license = "LGPL";
info->disabled = FALSE;
}