gp_proxy_shm.h

//SPDX-License-Identifier: LGPL-2.0-or-later
/*
 
   Copyright (c) 2019-2020 Cyril Hrubis <metan@ucw.cz>
 
 */
 
#ifndef GP_PROXY_SHM_H
#define GP_PROXY_SHM_H
 
#include <backends/gp_proxy_proto.h>
#include <core/gp_pixmap.h>
 
typedef struct gp_proxy_shm {
        int fd;
        size_t size;
        gp_pixmap pixmap;
        struct gp_proxy_path path;
} gp_proxy_shm;
 
/*
 * Creates an SHM pixmap.
 *
 * @path in the /dev/shm/ filesystem, 64 bytes at max.
 */
gp_proxy_shm *gp_proxy_shm_init(const char *path, gp_size w, gp_size h, gp_pixel_type type);
 
/*
 * Resizes SHM image, all clients have to avoid working with the buffer once
 * this call is called and have to remap the shm before they attempt to use it again.
 *
 * @returns 0 if shm buffer haven't needed to be resized, only pixmap size has been changed
 *          1 if buffer was resized
 *          -1 on failure
 */
int gp_proxy_shm_resize(gp_proxy_shm *self, gp_size w, gp_size h);
 
void gp_proxy_shm_exit(gp_proxy_shm *self);
 
#endif /* GP_PROXY_SHM_H */