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#include <string.h>
#include <sys/mman.h>
#include <unistd.h>
#include "log.h"
#include "shm.h"
#include "surface.h"
#undef MAX
#define MAX(a, b) ((a) > (b) ? (a) : (b))
void surface_init(
struct surface *surface,
struct wl_shm *wl_shm)
{
const int height = surface->height;
const int width = surface->width;
/* Assume 4 bytes per pixel for WL_SHM_FORMAT_ARGB8888 */
const int stride = width * 4;
surface->stride = stride;
/* Double-buffered pool, so allocate space for two windows */
surface->shm_pool_size =
height
* stride
* 2;
surface->shm_pool_fd = shm_allocate_file(surface->shm_pool_size);
surface->shm_pool_data = mmap(
NULL,
surface->shm_pool_size,
PROT_READ | PROT_WRITE,
MAP_SHARED,
surface->shm_pool_fd,
0);
#ifdef __linux__
/*
* On linux, ask for Transparent HugePages if available and our
* buffer's at least 2MiB. This can greatly speed up the first
* cairo_paint() by reducing page faults, but unfortunately is disabled
* for shared memory at the time of writing.
*
* MADV_HUGEPAGE isn't available on *BSD, which we could conceivably be
* running on.
*/
if (surface->shm_pool_size >= (2 << 20)) {
madvise(surface->shm_pool_data, surface->shm_pool_size, MADV_HUGEPAGE);
}
#endif
surface->wl_shm_pool = wl_shm_create_pool(
wl_shm,
surface->shm_pool_fd,
surface->shm_pool_size);
for (int i = 0; i < 2; i++) {
int offset = height * stride * i;
surface->buffers[i] = wl_shm_pool_create_buffer(
surface->wl_shm_pool,
offset,
width,
height,
stride,
WL_SHM_FORMAT_ARGB8888);
}
log_debug("Created shm file with size %d KiB.\n",
surface->shm_pool_size / 1024);
}
void surface_destroy(struct surface *surface)
{
wl_shm_pool_destroy(surface->wl_shm_pool);
munmap(surface->shm_pool_data, surface->shm_pool_size);
surface->shm_pool_data = NULL;
close(surface->shm_pool_fd);
wl_buffer_destroy(surface->buffers[0]);
wl_buffer_destroy(surface->buffers[1]);
}
void surface_draw(struct surface *surface)
{
wl_surface_attach(surface->wl_surface, surface->buffers[surface->index], 0, 0);
wl_surface_damage_buffer(surface->wl_surface, 0, 0, INT32_MAX, INT32_MAX);
wl_surface_commit(surface->wl_surface);
surface->index = !surface->index;
}
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