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/* GdkPixbuf library - Main header file
*
* Copyright (C) 1999 The Free Software Foundation
*
* Authors: Mark Crichton <crichton@gimp.org>
* Miguel de Icaza <miguel@gnu.org>
* Federico Mena-Quintero <federico@gimp.org>
* Jonathan Blandford <jrb@redhat.com>
*
* 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.
*/
#include "gdk-pixbuf-loader.h"
#include "gdk-pixbuf-io.h"
static GtkObjectClass *parent_class;
static void gdk_pixbuf_loader_class_init (GdkPixbufLoaderClass *klass);
static void gdk_pixbuf_loader_init (GdkPixbufLoader *loader);
static void gdk_pixbuf_loader_destroy (GtkObject *loader);
static void gdk_pixbuf_loader_finalize (GtkObject *loader);
/* Internal data */
typedef struct _GdkPixbufLoaderPrivate GdkPixbufLoaderPrivate;
struct _GdkPixbufLoaderPrivate
{
GdkPixbuf *pixbuf;
gboolean closed;
gchar buf[128];
gint buf_offset;
ModuleType *image_module;
};
GtkType
gdk_pixbuf_loader_get_type (void)
{
static GtkType loader_type = 0;
if (!loader_type) {
static const GtkTypeInfo loader_info = {
"GdkPixbufLoader",
sizeof (GdkPixbufLoader),
sizeof (GdkPixbufLoaderClass),
(GtkClassInitFunc) gdk_pixbuf_loader_class_init,
(GtkObjectInitFunc) gdk_pixbuf_loader_init,
/* reserved_1 */ NULL,
/* reserved_2 */ NULL,
(GtkClassInitFunc) NULL,
};
loader_type = gtk_type_unique (GTK_TYPE_OBJECT, &loader_info);
}
return loader_type;
}
static void
gdk_pixbuf_loader_class_init (GdkPixbufLoaderClass *klass)
{
parent_class = GTK_OBJECT_CLASS (klass);
parent_class->destroy = gdk_pixbuf_loader_destroy;
parent_class->finalize = gdk_pixbuf_loader_finalize;
}
static void
gdk_pixbuf_loader_init (GdkPixbufLoader *loader)
{
GdkPixbufLoaderPrivate *priv;
priv = g_new (GdkPixbufLoaderPrivate, 1);
loader->private = priv;
priv->pixbuf = NULL;
priv->closed = FALSE;
priv->buf_offset = 0;
}
static void
gdk_pixbuf_loader_destroy (GtkObject *loader)
{
GdkPixbufLoaderPrivate *priv = NULL;
priv = GDK_PIXBUF_LOADER (loader)->private;
gdk_pixbuf_unref (priv->pixbuf);
}
static void
gdk_pixbuf_loader_finalize (GtkObject *loader)
{
GdkPixbufLoader *load;
GdkPixbufLoaderPrivate *priv = NULL;
load = GTK_CHECK_CAST (loader, GDK_TYPE_PIXBUF_LOADER, GdkPixbufLoader);
priv = GDK_PIXBUF_LOADER (loader)->private;
g_free (priv);
}
/* Public functions */
GtkObject *
gdk_pixbuf_loader_new (void)
{
GdkPixbufLoader *loader;
loader = gtk_type_new (gdk_pixbuf_loader_get_type ());
return GTK_OBJECT (loader);
}
/**
* gdk_pixbuf_loader_write:
* @loader: A loader.
* @buf: The image data.
* @count: The length of @buf in bytes.
*
* This will load the next @size bytes of the image. It will return TRUE if the
* data was loaded successfully, and FALSE if an error occurred. In this case,
* the loader will be closed, and will not accept further writes.
*
* Return value: Returns TRUE if the write was successful -- FALSE if the loader
* cannot parse the buf.
**/
gboolean
gdk_pixbuf_loader_write (GdkPixbufLoader *loader, gchar *buf, gint count)
{
GdkPixbufLoaderPrivate *priv;
g_return_val_if_fail (loader != NULL, FALSE);
g_return_val_if_fail (GDK_IS_PIXBUF_LOADER (loader), FALSE);
g_return_val_if_fail (buf != NULL, FALSE);
g_return_val_if_fail (count >= 0, FALSE);
priv = loader->private;
/* we expect it's not to be closed */
g_return_val_if_fail (priv->closed == FALSE, FALSE);
if (priv->image_module == NULL) {
g_print ("buf_offset:%d:\n", priv->buf_offset);
memcpy (priv->buf + priv->buf_offset,
buf,
(priv->buf_offset + count) > 128 ? 128 - priv->buf_offset : count);
if ((priv->buf_offset + count) >= 128) {
priv->image_module = gdk_pixbuf_get_module (priv->buf, 128);
if (priv->image_module == NULL) {
g_print ("no module loaded. bummer\n");
return FALSE;
} else {
g_print ("module loaded: name is %s\n", priv->image_module->module_name);
}
} else {
priv->buf_offset += count;
}
}
return TRUE;
}
/**
* gdk_pixbuf_loader_get_pixbuf:
* @loader: A loader.
*
* Gets the GdkPixbuf that the loader is currently loading. If the loader
* hasn't been enough data via gdk_pixbuf_loader_write, then NULL is returned.
* Any application using this function should check for this value when it is
* used. The pixbuf returned will be the same in all future calls to the
* loader, so simply calling a gdk_pixbuf_ref() should be sufficient to continue
* using it.
*
* Return value: The GdkPixbuf that the loader is loading.
**/
GdkPixbuf *
gdk_pixbuf_loader_get_pixbuf (GdkPixbufLoader *loader)
{
GdkPixbufLoaderPrivate *priv;
g_return_val_if_fail (loader != NULL, NULL);
g_return_val_if_fail (GDK_IS_PIXBUF_LOADER (loader), NULL);
priv = loader->private;
return priv->pixbuf;
}
/**
* gdk_pixbuf_loader_close:
* @loader: A loader.
*
* Tells the loader to stop accepting writes
*
**/
void
gdk_pixbuf_loader_close (GdkPixbufLoader *loader)
{
GdkPixbufLoaderPrivate *priv;
g_return_if_fail (loader != NULL);
g_return_if_fail (GDK_IS_PIXBUF_LOADER (loader));
priv = loader->private;
/* we expect it's not closed */
g_return_if_fail (priv->closed == FALSE);
priv->closed = TRUE;
}
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