145 lines
3.6 KiB
C
145 lines
3.6 KiB
C
/*
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* poolbuf - https://codeberg.org/sewn/drwl
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*
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* Copyright (c) 2023-2024 sewn <sewn@disroot.org>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <stddef.h>
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#include <stdint.h>
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#include <sys/mman.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <wayland-client.h>
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#include "drwl.h"
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typedef struct {
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struct wl_buffer *wl_buf;
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int32_t stride;
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int32_t size;
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void *data;
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} PoolBuf;
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#if defined(__linux__) || defined(___FreeBSD__)
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#ifdef __linux__
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#include <linux/memfd.h>
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#endif
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#define __POOLBUF_HAS_MEMFD_CREATE
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int memfd_create(const char *, unsigned);
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#else
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static void
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randname(char *buf)
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{
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struct timespec ts;
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clock_gettime(CLOCK_REALTIME, &ts);
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long r = ts.tv_nsec;
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for (int i = 0; i < 6; ++i) {
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buf[i] = 'A'+(r&15)+(r&16)*2;
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r >>= 5;
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}
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}
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static int
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create_shm(void)
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{
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char name[] = "/drwl-XXXXXX";
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int retries = 100;
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do {
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randname(name + sizeof(name) - 7);
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--retries;
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int fd = shm_open(name, O_RDWR | O_CREAT | O_EXCL, 0600);
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if (fd >= 0) {
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shm_unlink(name);
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return fd;
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}
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} while (retries > 0 && errno == EEXIST);
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return -1;
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}
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#endif
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static void
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poolbuf_destroy(PoolBuf *buf)
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{
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wl_buffer_destroy(buf->wl_buf);
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munmap(buf->data, buf->size);
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free(buf);
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}
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static void
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poolbuf_buffer_release(void *data, struct wl_buffer *wl_buffer)
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{
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PoolBuf *buf = data;
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poolbuf_destroy(buf);
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}
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static struct wl_buffer_listener poolbuf_buffer_listener = {
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.release = poolbuf_buffer_release,
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};
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/* Caller must call poolbuf_destroy after finalizing usage if norelease is passed */
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static PoolBuf *
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poolbuf_create(struct wl_shm *shm, int32_t width, int32_t height, int norelease)
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{
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int fd;
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void *data;
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struct wl_shm_pool *shm_pool;
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struct wl_buffer *wl_buf;
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int32_t stride = drwl_stride(width);
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int32_t size = stride * height;
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PoolBuf *buf;
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#ifdef __POOLBUF_HAS_MEMFD_CREATE
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fd = memfd_create("drwl-shm-buffer-pool",
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MFD_CLOEXEC | MFD_ALLOW_SEALING | MFD_NOEXEC_SEAL);
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#else
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fd = create_shm();
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#endif
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if (fd < 0)
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return NULL;
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if ((ftruncate(fd, size)) < 0) {
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close(fd);
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return NULL;
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}
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data = mmap(NULL, size,
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PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
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if (data == MAP_FAILED) {
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close(fd);
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return NULL;
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}
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shm_pool = wl_shm_create_pool(shm, fd, size);
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wl_buf = wl_shm_pool_create_buffer(shm_pool, 0,
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width, height, stride, WL_SHM_FORMAT_ARGB8888);
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wl_shm_pool_destroy(shm_pool);
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close(fd);
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buf = calloc(1, sizeof(PoolBuf));
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buf->wl_buf = wl_buf;
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buf->stride = stride;
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buf->size = size;
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buf->data = data;
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if (!norelease)
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wl_buffer_add_listener(wl_buf, &poolbuf_buffer_listener, buf);
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return buf;
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}
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