/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*- */ /* GdkPixbuf library - Progressive loader object * * Copyright (C) 1999 The Free Software Foundation * * Authors: Mark Crichton * Miguel de Icaza * Federico Mena-Quintero * Jonathan Blandford * * 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 . */ #include "config.h" #include #include "gdk-pixbuf-private.h" #include "gdk-pixbuf-animation.h" #include "gdk-pixbuf-scaled-anim.h" #include "gdk-pixbuf-loader.h" #include "gdk-pixbuf-marshal.h" /** * SECTION:gdk-pixbuf-loader * @Short_description: Application-driven progressive image loading. * @Title: GdkPixbufLoader * @See_also: gdk_pixbuf_new_from_file(), gdk_pixbuf_animation_new_from_file() * * #GdkPixbufLoader provides a way for applications to drive the * process of loading an image, by letting them send the image data * directly to the loader instead of having the loader read the data * from a file. Applications can use this functionality instead of * gdk_pixbuf_new_from_file() or gdk_pixbuf_animation_new_from_file() * when they need to parse image data in * small chunks. For example, it should be used when reading an * image from a (potentially) slow network connection, or when * loading an extremely large file. * * * To use #GdkPixbufLoader to load an image, just create a new one, and * call gdk_pixbuf_loader_write() to send the data to it. When done, * gdk_pixbuf_loader_close() should be called to end the stream and * finalize everything. The loader will emit three important signals * throughout the process. The first, #GdkPixbufLoader::size-prepared, * will be emitted as soon as the image has enough information to * determine the size of the image to be used. If you want to scale * the image while loading it, you can call gdk_pixbuf_loader_set_size() * in response to this signal. * * * The second signal, #GdkPixbufLoader::area-prepared, will be emitted as * soon as the pixbuf of the desired has been allocated. You can obtain it * by calling gdk_pixbuf_loader_get_pixbuf(). If you want to use it, simply * ref it. You can also call gdk_pixbuf_loader_get_pixbuf() later and get * the same pixbuf. * * The last signal, #GdkPixbufLoader::area-updated, gets emitted every time * a region is updated. This way you can update a partially completed image. * Note that you do not know anything about the completeness of an image * from the updated area. For example, in an interlaced image, you need to * make several passes before the image is done loading. * * # Loading an animation * * Loading an animation is almost as easy as loading an image. Once the first * #GdkPixbufLoader::area-prepared signal has been emitted, you can call * gdk_pixbuf_loader_get_animation() to get the #GdkPixbufAnimation struct * and gdk_pixbuf_animation_get_iter() to get a #GdkPixbufAnimationIter for * displaying it. */ enum { SIZE_PREPARED, AREA_PREPARED, AREA_UPDATED, CLOSED, LAST_SIGNAL }; static void gdk_pixbuf_loader_finalize (GObject *loader); static guint pixbuf_loader_signals[LAST_SIGNAL] = { 0 }; /* Internal data */ typedef struct { GdkPixbufAnimation *animation; gboolean closed; guchar header_buf[SNIFF_BUFFER_SIZE]; gint header_buf_offset; GdkPixbufModule *image_module; gpointer context; gint width; gint height; gboolean size_fixed; gboolean needs_scale; gchar *filename; } GdkPixbufLoaderPrivate; G_DEFINE_TYPE (GdkPixbufLoader, gdk_pixbuf_loader, G_TYPE_OBJECT) static void gdk_pixbuf_loader_class_init (GdkPixbufLoaderClass *class) { GObjectClass *object_class; object_class = (GObjectClass *) class; object_class->finalize = gdk_pixbuf_loader_finalize; /** * GdkPixbufLoader::size-prepared: * @loader: the object which received the signal. * @width: the original width of the image * @height: the original height of the image * * This signal is emitted when the pixbuf loader has been fed the * initial amount of data that is required to figure out the size * of the image that it will create. Applications can call * gdk_pixbuf_loader_set_size() in response to this signal to set * the desired size to which the image should be scaled. */ pixbuf_loader_signals[SIZE_PREPARED] = g_signal_new ("size-prepared", G_TYPE_FROM_CLASS (object_class), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GdkPixbufLoaderClass, size_prepared), NULL, NULL, _gdk_pixbuf_marshal_VOID__INT_INT, G_TYPE_NONE, 2, G_TYPE_INT, G_TYPE_INT); /** * GdkPixbufLoader::area-prepared: * @loader: the object which received the signal. * * This signal is emitted when the pixbuf loader has allocated the * pixbuf in the desired size. After this signal is emitted, * applications can call gdk_pixbuf_loader_get_pixbuf() to fetch * the partially-loaded pixbuf. */ pixbuf_loader_signals[AREA_PREPARED] = g_signal_new ("area-prepared", G_TYPE_FROM_CLASS (object_class), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GdkPixbufLoaderClass, area_prepared), NULL, NULL, _gdk_pixbuf_marshal_VOID__VOID, G_TYPE_NONE, 0); /** * GdkPixbufLoader::area-updated: * @loader: the object which received the signal. * @x: X offset of upper-left corner of the updated area. * @y: Y offset of upper-left corner of the updated area. * @width: Width of updated area. * @height: Height of updated area. * * This signal is emitted when a significant area of the image being * loaded has been updated. Normally it means that a complete * scanline has been read in, but it could be a different area as * well. Applications can use this signal to know when to repaint * areas of an image that is being loaded. */ pixbuf_loader_signals[AREA_UPDATED] = g_signal_new ("area-updated", G_TYPE_FROM_CLASS (object_class), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GdkPixbufLoaderClass, area_updated), NULL, NULL, _gdk_pixbuf_marshal_VOID__INT_INT_INT_INT, G_TYPE_NONE, 4, G_TYPE_INT, G_TYPE_INT, G_TYPE_INT, G_TYPE_INT); /** * GdkPixbufLoader::closed: * @loader: the object which received the signal. * * This signal is emitted when gdk_pixbuf_loader_close() is called. * It can be used by different parts of an application to receive * notification when an image loader is closed by the code that * drives it. */ pixbuf_loader_signals[CLOSED] = g_signal_new ("closed", G_TYPE_FROM_CLASS (object_class), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GdkPixbufLoaderClass, closed), NULL, NULL, _gdk_pixbuf_marshal_VOID__VOID, G_TYPE_NONE, 0); } static void gdk_pixbuf_loader_init (GdkPixbufLoader *loader) { GdkPixbufLoaderPrivate *priv; priv = g_new0 (GdkPixbufLoaderPrivate, 1); priv->width = -1; priv->height = -1; loader->priv = priv; } static void gdk_pixbuf_loader_finalize (GObject *object) { GdkPixbufLoader *loader; GdkPixbufLoaderPrivate *priv = NULL; loader = GDK_PIXBUF_LOADER (object); priv = loader->priv; if (!priv->closed) { g_warning ("GdkPixbufLoader finalized without calling gdk_pixbuf_loader_close() - this is not allowed. You must explicitly end the data stream to the loader before dropping the last reference."); } if (priv->animation) g_object_unref (priv->animation); g_free (priv->filename); g_free (priv); G_OBJECT_CLASS (gdk_pixbuf_loader_parent_class)->finalize (object); } /** * gdk_pixbuf_loader_set_size: * @loader: A pixbuf loader. * @width: The desired width of the image being loaded. * @height: The desired height of the image being loaded. * * Causes the image to be scaled while it is loaded. The desired * image size can be determined relative to the original size of * the image by calling gdk_pixbuf_loader_set_size() from a * signal handler for the ::size-prepared signal. * * Attempts to set the desired image size are ignored after the * emission of the ::size-prepared signal. * * Since: 2.2 */ void gdk_pixbuf_loader_set_size (GdkPixbufLoader *loader, gint width, gint height) { GdkPixbufLoaderPrivate *priv; g_return_if_fail (GDK_IS_PIXBUF_LOADER (loader)); g_return_if_fail (width >= 0 && height >= 0); priv = GDK_PIXBUF_LOADER (loader)->priv; if (!priv->size_fixed) { priv->width = width; priv->height = height; } } static void gdk_pixbuf_loader_size_func (gint *width, gint *height, gpointer loader) { GdkPixbufLoaderPrivate *priv = GDK_PIXBUF_LOADER (loader)->priv; /* allow calling gdk_pixbuf_loader_set_size() before the signal */ if (priv->width == -1 && priv->height == -1) { priv->width = *width; priv->height = *height; } g_signal_emit (loader, pixbuf_loader_signals[SIZE_PREPARED], 0, *width, *height); priv->size_fixed = TRUE; *width = priv->width; *height = priv->height; } static void gdk_pixbuf_loader_prepare (GdkPixbuf *pixbuf, GdkPixbufAnimation *anim, gpointer loader) { GdkPixbufLoaderPrivate *priv = GDK_PIXBUF_LOADER (loader)->priv; gint width, height; g_return_if_fail (pixbuf != NULL); width = anim ? gdk_pixbuf_animation_get_width (anim) : gdk_pixbuf_get_width (pixbuf); height = anim ? gdk_pixbuf_animation_get_height (anim) : gdk_pixbuf_get_height (pixbuf); if (!priv->size_fixed) { gint w = width; gint h = height; /* Defend against lazy loaders which don't call size_func */ gdk_pixbuf_loader_size_func (&w, &h, loader); } priv->needs_scale = FALSE; if (priv->width > 0 && priv->height > 0 && (priv->width != width || priv->height != height)) priv->needs_scale = TRUE; if (anim) g_object_ref (anim); else anim = gdk_pixbuf_non_anim_new (pixbuf); if (priv->needs_scale && width != 0 && height != 0) { priv->animation = GDK_PIXBUF_ANIMATION (_gdk_pixbuf_scaled_anim_new (anim, (double) priv->width / width, (double) priv->height / height, 1.0)); g_object_unref (anim); } else priv->animation = anim; if (!priv->needs_scale) g_signal_emit (loader, pixbuf_loader_signals[AREA_PREPARED], 0); } static void gdk_pixbuf_loader_update (GdkPixbuf *pixbuf, gint x, gint y, gint width, gint height, gpointer loader) { GdkPixbufLoaderPrivate *priv = GDK_PIXBUF_LOADER (loader)->priv; if (!priv->needs_scale) g_signal_emit (loader, pixbuf_loader_signals[AREA_UPDATED], 0, x, y, /* sanity check in here. Defend against an errant loader */ MIN (width, gdk_pixbuf_animation_get_width (priv->animation)), MIN (height, gdk_pixbuf_animation_get_height (priv->animation))); } /* Defense against broken loaders; DO NOT take this as a GError example! */ static void gdk_pixbuf_loader_ensure_error (GdkPixbufLoader *loader, GError **error) { GdkPixbufLoaderPrivate *priv = loader->priv; if (error == NULL || *error != NULL) return; g_warning ("Bug! loader '%s' didn't set an error on failure", priv->image_module->module_name); g_set_error (error, GDK_PIXBUF_ERROR, GDK_PIXBUF_ERROR_FAILED, _("Internal error: Image loader module “%s” failed to" " complete an operation, but didn’t give a reason for" " the failure"), priv->image_module->module_name); } static gint gdk_pixbuf_loader_load_module (GdkPixbufLoader *loader, const char *image_type, GError **error) { GdkPixbufLoaderPrivate *priv = loader->priv; if (image_type) { priv->image_module = _gdk_pixbuf_get_named_module (image_type, error); } else { priv->image_module = _gdk_pixbuf_get_module (priv->header_buf, priv->header_buf_offset, priv->filename, error); } if (priv->image_module == NULL) return 0; if (!_gdk_pixbuf_load_module (priv->image_module, error)) return 0; if (priv->image_module->module == NULL) return 0; if ((priv->image_module->begin_load == NULL) || (priv->image_module->stop_load == NULL) || (priv->image_module->load_increment == NULL)) { g_set_error (error, GDK_PIXBUF_ERROR, GDK_PIXBUF_ERROR_UNSUPPORTED_OPERATION, _("Incremental loading of image type “%s” is not supported"), priv->image_module->module_name); return 0; } priv->context = priv->image_module->begin_load (gdk_pixbuf_loader_size_func, gdk_pixbuf_loader_prepare, gdk_pixbuf_loader_update, loader, error); if (priv->context == NULL) { gdk_pixbuf_loader_ensure_error (loader, error); return 0; } if (priv->header_buf_offset && priv->image_module->load_increment (priv->context, priv->header_buf, priv->header_buf_offset, error)) return priv->header_buf_offset; return 0; } static int gdk_pixbuf_loader_eat_header_write (GdkPixbufLoader *loader, const guchar *buf, gsize count, GError **error) { gint n_bytes; GdkPixbufLoaderPrivate *priv = loader->priv; n_bytes = MIN(SNIFF_BUFFER_SIZE - priv->header_buf_offset, count); memcpy (priv->header_buf + priv->header_buf_offset, buf, n_bytes); priv->header_buf_offset += n_bytes; if (priv->header_buf_offset >= SNIFF_BUFFER_SIZE) { if (gdk_pixbuf_loader_load_module (loader, NULL, error) == 0) return 0; } return n_bytes; } /** * gdk_pixbuf_loader_write: * @loader: A pixbuf loader. * @buf: (array length=count): Pointer to image data. * @count: Length of the @buf buffer in bytes. * @error: return location for errors * * This will cause a pixbuf loader to parse the next @count bytes of * an image. It will return %TRUE if the data was loaded successfully, * and %FALSE if an error occurred. In the latter case, the loader * will be closed, and will not accept further writes. If %FALSE is * returned, @error will be set to an error from the #GDK_PIXBUF_ERROR * or #G_FILE_ERROR domains. * * Return value: %TRUE if the write was successful, or %FALSE if the loader * cannot parse the buffer. **/ gboolean gdk_pixbuf_loader_write (GdkPixbufLoader *loader, const guchar *buf, gsize count, GError **error) { GdkPixbufLoaderPrivate *priv; g_return_val_if_fail (GDK_IS_PIXBUF_LOADER (loader), FALSE); g_return_val_if_fail (buf != NULL, FALSE); g_return_val_if_fail (error == NULL || *error == NULL, FALSE); priv = loader->priv; /* we expect it's not to be closed */ g_return_val_if_fail (priv->closed == FALSE, FALSE); if (count > 0 && priv->image_module == NULL) { gint eaten; eaten = gdk_pixbuf_loader_eat_header_write (loader, buf, count, error); if (eaten <= 0) goto fail; count -= eaten; buf += eaten; } /* By this point, we expect the image_module to have been loaded. */ g_assert (count == 0 || priv->image_module != NULL); if (count > 0 && priv->image_module->load_increment != NULL) { if (!priv->image_module->load_increment (priv->context, buf, count, error)) goto fail; } return TRUE; fail: gdk_pixbuf_loader_ensure_error (loader, error); gdk_pixbuf_loader_close (loader, NULL); return FALSE; } /** * gdk_pixbuf_loader_write_bytes: * @loader: A pixbuf loader. * @buffer: The image data as a #GBytes * @error: return location for errors * * This will cause a pixbuf loader to parse a buffer inside a #GBytes * for an image. It will return %TRUE if the data was loaded successfully, * and %FALSE if an error occurred. In the latter case, the loader * will be closed, and will not accept further writes. If %FALSE is * returned, @error will be set to an error from the #GDK_PIXBUF_ERROR * or #G_FILE_ERROR domains. * * See also: gdk_pixbuf_loader_write() * * Return value: %TRUE if the write was successful, or %FALSE if the loader * cannot parse the buffer. * * Since: 2.30 */ gboolean gdk_pixbuf_loader_write_bytes (GdkPixbufLoader *loader, GBytes *buffer, GError **error) { g_return_val_if_fail (GDK_IS_PIXBUF_LOADER (loader), FALSE); g_return_val_if_fail (buffer != NULL, FALSE); g_return_val_if_fail (error == NULL || *error == NULL, FALSE); return gdk_pixbuf_loader_write (loader, g_bytes_get_data (buffer, NULL), g_bytes_get_size (buffer), error); } /** * gdk_pixbuf_loader_new: * * Creates a new pixbuf loader object. * * Return value: A newly-created pixbuf loader. **/ GdkPixbufLoader * gdk_pixbuf_loader_new (void) { return g_object_new (GDK_TYPE_PIXBUF_LOADER, NULL); } /** * gdk_pixbuf_loader_new_with_type: * @image_type: name of the image format to be loaded with the image * @error: (allow-none): return location for an allocated #GError, or %NULL to ignore errors * * Creates a new pixbuf loader object that always attempts to parse * image data as if it were an image of type @image_type, instead of * identifying the type automatically. Useful if you want an error if * the image isn't the expected type, for loading image formats * that can't be reliably identified by looking at the data, or if * the user manually forces a specific type. * * The list of supported image formats depends on what image loaders * are installed, but typically "png", "jpeg", "gif", "tiff" and * "xpm" are among the supported formats. To obtain the full list of * supported image formats, call gdk_pixbuf_format_get_name() on each * of the #GdkPixbufFormat structs returned by gdk_pixbuf_get_formats(). * * Return value: A newly-created pixbuf loader. **/ GdkPixbufLoader * gdk_pixbuf_loader_new_with_type (const char *image_type, GError **error) { GdkPixbufLoader *retval; GError *tmp; g_return_val_if_fail (error == NULL || *error == NULL, NULL); retval = g_object_new (GDK_TYPE_PIXBUF_LOADER, NULL); tmp = NULL; gdk_pixbuf_loader_load_module (retval, image_type, &tmp); if (tmp != NULL) { g_propagate_error (error, tmp); gdk_pixbuf_loader_close (retval, NULL); g_object_unref (retval); return NULL; } return retval; } /** * gdk_pixbuf_loader_new_with_mime_type: * @mime_type: the mime type to be loaded * @error: (allow-none): return location for an allocated #GError, or %NULL to ignore errors * * Creates a new pixbuf loader object that always attempts to parse * image data as if it were an image of mime type @mime_type, instead of * identifying the type automatically. Useful if you want an error if * the image isn't the expected mime type, for loading image formats * that can't be reliably identified by looking at the data, or if * the user manually forces a specific mime type. * * The list of supported mime types depends on what image loaders * are installed, but typically "image/png", "image/jpeg", "image/gif", * "image/tiff" and "image/x-xpixmap" are among the supported mime types. * To obtain the full list of supported mime types, call * gdk_pixbuf_format_get_mime_types() on each of the #GdkPixbufFormat * structs returned by gdk_pixbuf_get_formats(). * * Return value: A newly-created pixbuf loader. * Since: 2.4 **/ GdkPixbufLoader * gdk_pixbuf_loader_new_with_mime_type (const char *mime_type, GError **error) { const char * image_type = NULL; char ** mimes; GdkPixbufLoader *retval; GError *tmp; GSList * formats; GdkPixbufFormat *info; int i, j, length; formats = gdk_pixbuf_get_formats (); length = g_slist_length (formats); for (i = 0; i < length && image_type == NULL; i++) { info = (GdkPixbufFormat *)g_slist_nth_data (formats, i); mimes = info->mime_types; for (j = 0; mimes[j] != NULL; j++) if (g_ascii_strcasecmp (mimes[j], mime_type) == 0) { image_type = info->name; break; } } g_slist_free (formats); retval = g_object_new (GDK_TYPE_PIXBUF_LOADER, NULL); tmp = NULL; gdk_pixbuf_loader_load_module (retval, image_type, &tmp); if (tmp != NULL) { g_propagate_error (error, tmp); gdk_pixbuf_loader_close (retval, NULL); g_object_unref (retval); return NULL; } return retval; } GdkPixbufLoader * _gdk_pixbuf_loader_new_with_filename (const char *filename) { GdkPixbufLoader *retval; GdkPixbufLoaderPrivate *priv; retval = g_object_new (GDK_TYPE_PIXBUF_LOADER, NULL); priv = retval->priv; priv->filename = g_strdup (filename); return retval; } /** * gdk_pixbuf_loader_get_pixbuf: * @loader: A pixbuf loader. * * Queries the #GdkPixbuf that a pixbuf loader is currently creating. * In general it only makes sense to call this function after the * "area-prepared" signal has been emitted by the loader; this means * that enough data has been read to know the size of the image that * will be allocated. If the loader has not received enough data via * gdk_pixbuf_loader_write(), then this function returns %NULL. The * returned pixbuf will be the same in all future calls to the loader, * so simply calling g_object_ref() should be sufficient to continue * using it. Additionally, if the loader is an animation, it will * return the "static image" of the animation * (see gdk_pixbuf_animation_get_static_image()). * * Return value: (transfer none): The #GdkPixbuf that the loader is creating, or %NULL if not * enough data has been read to determine how to create the image buffer. **/ GdkPixbuf * gdk_pixbuf_loader_get_pixbuf (GdkPixbufLoader *loader) { GdkPixbufLoaderPrivate *priv; g_return_val_if_fail (GDK_IS_PIXBUF_LOADER (loader), NULL); priv = loader->priv; if (priv->animation) return gdk_pixbuf_animation_get_static_image (priv->animation); else return NULL; } /** * gdk_pixbuf_loader_get_animation: * @loader: A pixbuf loader * * Queries the #GdkPixbufAnimation that a pixbuf loader is currently creating. * In general it only makes sense to call this function after the "area-prepared" * signal has been emitted by the loader. If the loader doesn't have enough * bytes yet (hasn't emitted the "area-prepared" signal) this function will * return %NULL. * * Return value: (transfer none): The #GdkPixbufAnimation that the loader is loading, or %NULL if * not enough data has been read to determine the information. **/ GdkPixbufAnimation * gdk_pixbuf_loader_get_animation (GdkPixbufLoader *loader) { GdkPixbufLoaderPrivate *priv; g_return_val_if_fail (GDK_IS_PIXBUF_LOADER (loader), NULL); priv = loader->priv; return priv->animation; } /** * gdk_pixbuf_loader_close: * @loader: A pixbuf loader. * @error: (allow-none): return location for a #GError, or %NULL to ignore errors * * Informs a pixbuf loader that no further writes with * gdk_pixbuf_loader_write() will occur, so that it can free its * internal loading structures. Also, tries to parse any data that * hasn't yet been parsed; if the remaining data is partial or * corrupt, an error will be returned. If %FALSE is returned, @error * will be set to an error from the #GDK_PIXBUF_ERROR or #G_FILE_ERROR * domains. If you're just cancelling a load rather than expecting it * to be finished, passing %NULL for @error to ignore it is * reasonable. * * Remember that this does not unref the loader, so if you plan not to * use it anymore, please g_object_unref() it. * * Returns: %TRUE if all image data written so far was successfully passed out via the update_area signal **/ gboolean gdk_pixbuf_loader_close (GdkPixbufLoader *loader, GError **error) { GdkPixbufLoaderPrivate *priv; gboolean retval = TRUE; g_return_val_if_fail (GDK_IS_PIXBUF_LOADER (loader), TRUE); g_return_val_if_fail (error == NULL || *error == NULL, TRUE); priv = loader->priv; if (priv->closed) return TRUE; /* We have less than SNIFF_BUFFER_SIZE bytes in the image. * Flush it, and keep going. */ if (priv->image_module == NULL) { GError *tmp = NULL; gdk_pixbuf_loader_load_module (loader, NULL, &tmp); if (tmp != NULL) { g_propagate_error (error, tmp); retval = FALSE; } } if (priv->image_module && priv->image_module->stop_load && priv->context) { GError *tmp = NULL; if (!priv->image_module->stop_load (priv->context, &tmp) || tmp) { /* don't call gdk_pixbuf_loader_ensure_error() * here, since we might not get an error in the * gdk_pixbuf_get_file_info() case */ if (tmp) { if (error && *error == NULL) g_propagate_error (error, tmp); else g_error_free (tmp); } retval = FALSE; } } priv->closed = TRUE; if (priv->needs_scale) { g_signal_emit (loader, pixbuf_loader_signals[AREA_PREPARED], 0); g_signal_emit (loader, pixbuf_loader_signals[AREA_UPDATED], 0, 0, 0, priv->width, priv->height); } g_signal_emit (loader, pixbuf_loader_signals[CLOSED], 0); return retval; } /** * gdk_pixbuf_loader_get_format: * @loader: A pixbuf loader. * * Obtains the available information about the format of the * currently loading image file. * * Returns: (nullable) (transfer none): A #GdkPixbufFormat or * %NULL. The return value is owned by GdkPixbuf and should not be * freed. * * Since: 2.2 */ GdkPixbufFormat * gdk_pixbuf_loader_get_format (GdkPixbufLoader *loader) { GdkPixbufLoaderPrivate *priv; g_return_val_if_fail (GDK_IS_PIXBUF_LOADER (loader), NULL); priv = loader->priv; if (priv->image_module) return _gdk_pixbuf_get_format (priv->image_module); else return NULL; }