mirror of
https://github.com/hyprwm/wlroots-hyprland.git
synced 2024-11-22 21:05:58 +01:00
c6b009ef85
It allocates in local main memory via shm_open, and provides a FD to allow sharing with other processes. This is suitable for software rendering under the Wayland and X11 backends.
108 lines
2.9 KiB
C
108 lines
2.9 KiB
C
#include <assert.h>
|
|
#include <drm_fourcc.h>
|
|
#include <stdlib.h>
|
|
#include <sys/mman.h>
|
|
#include <unistd.h>
|
|
#include <wlr/util/log.h>
|
|
#include "render/pixel_format.h"
|
|
#include "render/shm_allocator.h"
|
|
#include "util/shm.h"
|
|
|
|
static const struct wlr_buffer_impl buffer_impl;
|
|
|
|
static struct wlr_shm_buffer *shm_buffer_from_buffer(
|
|
struct wlr_buffer *wlr_buffer) {
|
|
assert(wlr_buffer->impl == &buffer_impl);
|
|
return (struct wlr_shm_buffer *)wlr_buffer;
|
|
}
|
|
|
|
static void buffer_destroy(struct wlr_buffer *wlr_buffer) {
|
|
struct wlr_shm_buffer *buffer = shm_buffer_from_buffer(wlr_buffer);
|
|
munmap(buffer->data, buffer->size);
|
|
close(buffer->shm.fd);
|
|
free(buffer);
|
|
}
|
|
|
|
static bool buffer_get_shm(struct wlr_buffer *wlr_buffer,
|
|
struct wlr_shm_attributes *shm) {
|
|
struct wlr_shm_buffer *buffer = shm_buffer_from_buffer(wlr_buffer);
|
|
memcpy(shm, &buffer->shm, sizeof(*shm));
|
|
return true;
|
|
}
|
|
|
|
static bool buffer_get_data_ptr(struct wlr_buffer *wlr_buffer, void **data,
|
|
size_t *stride) {
|
|
struct wlr_shm_buffer *buffer = shm_buffer_from_buffer(wlr_buffer);
|
|
*data = buffer->data;
|
|
*stride = buffer->shm.stride;
|
|
return true;
|
|
}
|
|
|
|
static const struct wlr_buffer_impl buffer_impl = {
|
|
.destroy = buffer_destroy,
|
|
.get_shm = buffer_get_shm,
|
|
.get_data_ptr = buffer_get_data_ptr,
|
|
};
|
|
|
|
static struct wlr_buffer *allocator_create_buffer(
|
|
struct wlr_allocator *wlr_allocator, int width, int height,
|
|
const struct wlr_drm_format *format) {
|
|
const struct wlr_pixel_format_info *info =
|
|
drm_get_pixel_format_info(format->format);
|
|
if (info == NULL) {
|
|
wlr_log(WLR_ERROR, "Unsupported pixel format 0x%"PRIX32, format->format);
|
|
return NULL;
|
|
}
|
|
|
|
struct wlr_shm_buffer *buffer = calloc(1, sizeof(*buffer));
|
|
if (buffer == NULL) {
|
|
return NULL;
|
|
}
|
|
wlr_buffer_init(&buffer->base, &buffer_impl, width, height);
|
|
|
|
// TODO: consider using a single file for multiple buffers
|
|
int bytes_per_pixel = info->bpp / 8;
|
|
int stride = width * bytes_per_pixel; // TODO: align?
|
|
buffer->size = stride * height;
|
|
buffer->shm.fd = allocate_shm_file(buffer->size);
|
|
if (buffer->shm.fd < 0) {
|
|
free(buffer);
|
|
return NULL;
|
|
}
|
|
|
|
buffer->shm.format = format->format;
|
|
buffer->shm.width = width;
|
|
buffer->shm.height = height;
|
|
buffer->shm.stride = stride;
|
|
buffer->shm.offset = 0;
|
|
|
|
buffer->data = mmap(NULL, buffer->size, PROT_READ | PROT_WRITE, MAP_SHARED,
|
|
buffer->shm.fd, 0);
|
|
if (buffer->data == MAP_FAILED) {
|
|
wlr_log_errno(WLR_ERROR, "mmap failed");
|
|
close(buffer->shm.fd);
|
|
free(buffer);
|
|
return NULL;
|
|
}
|
|
|
|
return &buffer->base;
|
|
}
|
|
|
|
static void allocator_destroy(struct wlr_allocator *wlr_allocator) {
|
|
free(wlr_allocator);
|
|
}
|
|
|
|
static const struct wlr_allocator_interface allocator_impl = {
|
|
.destroy = allocator_destroy,
|
|
.create_buffer = allocator_create_buffer,
|
|
};
|
|
|
|
struct wlr_shm_allocator *wlr_shm_allocator_create(void) {
|
|
struct wlr_shm_allocator *allocator = calloc(1, sizeof(*allocator));
|
|
if (allocator == NULL) {
|
|
return NULL;
|
|
}
|
|
wlr_allocator_init(&allocator->base, &allocator_impl);
|
|
|
|
return allocator;
|
|
}
|