* @file imgstore.h IM Image Store API * @see @ref imgstore-signals * Purple is the legal property of its developers, whose names are too numerous * to list here. Please refer to the COPYRIGHT file distributed with this * This program 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 of the License, or * (at your option) any later version. * This program 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 this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301 USA #ifndef _PURPLE_IMGSTORE_H_ #define _PURPLE_IMGSTORE_H_ * A set of utility functions that provide a reference-counted immutable * wrapper around an image's data and filename. These functions do not * cache any data to disk. typedef struct _PurpleStoredImage PurpleStoredImage; * Create a new PurpleStoredImage. * Despite the name of this function, the image is NOT added to the image * store and no ID is assigned. If you need to reference the image by an * ID, use purple_imgstore_add_with_id() instead. * The caller owns a reference to this image and must dereference it with * purple_imgstore_unref() for it to be freed. * @param data Pointer to the image data, which the imgstore will take * ownership of and free as appropriate. If you want a * copy of the data, make it before calling this function. * @param size Image data's size. * @param filename Filename associated with image. This is for your * convenience. It could be the full path to the * image or, more commonly, the filename of the image * without any directory information. It can also be * NULL, if you don't need to keep track of a filename. * @return The stored image, or NULL if the image was not added (because of purple_imgstore_add(gpointer data, size_t size, const char *filename); * Create a PurpleStoredImage using purple_imgstore_add() by reading the * given filename from disk. * The image is not added to the image store and no ID is assigned. If you * need to reference the image by an ID, use purple_imgstore_add_with_id() * The caller owns a reference to this image and must dereference it with * purple_imgstore_unref() for it to be freed. * @param path The path to the image. * @return The stored image, or NULL if the image was not added (because of purple_imgstore_new_from_file(const char *path); * Create a PurpleStoredImage using purple_imgstore_add() and add the * image to the image store. A unique ID will be assigned to the image. * The caller owns a reference to the image and must dereference it with * purple_imgstore_unref() or purple_imgstore_unref_by_id() for it to be * @param data Pointer to the image data, which the imgstore will take * ownership of and free as appropriate. If you want a * copy of the data, make it before calling this function. * @param size Image data's size. * @param filename Filename associated with image. This is for your * convenience. It could be the full path to the * image or, more commonly, the filename of the image * without any directory information. It can also be * NULL, if you don't need to keep track of a filename. * @return ID for the image. This is a unique number that can be used * within libpurple to reference the image. 0 is returned if the * image was not added (because of empty data or size). int purple_imgstore_add_with_id(gpointer data, size_t size, const char *filename); * Retrieve an image from the store. The caller does not own a * reference to the image. * @param id The ID for the image. * @return A pointer to the requested image, or NULL if it was not found. PurpleStoredImage *purple_imgstore_find_by_id(int id); * Retrieves a pointer to the image's data. * @return A pointer to the data, which must not gconstpointer purple_imgstore_get_data(PurpleStoredImage *img); * Retrieves the length of the image's data. * @return The size of the data that the pointer returned by * purple_imgstore_get_data points to. size_t purple_imgstore_get_size(PurpleStoredImage *img); * Retrieves a pointer to the image's filename. * @return A pointer to the filename, which must not const char *purple_imgstore_get_filename(const PurpleStoredImage *img); * Looks at the magic numbers of the image data (the first few bytes) * and returns an extension corresponding to the image's file type. * @return The image's extension (for example "png") or "icon" const char *purple_imgstore_get_extension(PurpleStoredImage *img); * Increment the reference count. purple_imgstore_ref(PurpleStoredImage *img); * Decrement the reference count. * If the reference count reaches zero, the image will be freed. * @return @a img or @c NULL if the reference count reached zero. purple_imgstore_unref(PurpleStoredImage *img); * Increment the reference count using an ID. * This is a convience wrapper for purple_imgstore_find_by_id() and * purple_imgstore_ref(), so if you have a PurpleStoredImage, it'll * be more efficient to call purple_imgstore_ref() directly. * @param id The ID for the image. void purple_imgstore_ref_by_id(int id); * Decrement the reference count using an ID. * This is a convience wrapper for purple_imgstore_find_by_id() and * purple_imgstore_unref(), so if you have a PurpleStoredImage, it'll * be more efficient to call purple_imgstore_unref() directly. * @param id The ID for the image. void purple_imgstore_unref_by_id(int id); * Returns the image store subsystem handle. * @return The subsystem handle. void *purple_imgstore_get_handle(void); * Initializes the image store subsystem. void purple_imgstore_init(void); * Uninitializes the image store subsystem. void purple_imgstore_uninit(void); #endif /* _PURPLE_IMGSTORE_H_ */