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#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/allocator/shm.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 shm_buffer_begin_data_ptr_access(struct wlr_buffer *wlr_buffer,
uint32_t flags, void **data, uint32_t *format, size_t *stride) {
struct wlr_shm_buffer *buffer = shm_buffer_from_buffer(wlr_buffer);
*data = buffer->data;
*format = buffer->shm.format;
*stride = buffer->shm.stride;
return true;
}
static void shm_buffer_end_data_ptr_access(struct wlr_buffer *wlr_buffer) {
// This space is intentionally left blank
}
static const struct wlr_buffer_impl buffer_impl = {
.destroy = buffer_destroy,
.get_shm = buffer_get_shm,
.begin_data_ptr_access = shm_buffer_begin_data_ptr_access,
.end_data_ptr_access = shm_buffer_end_data_ptr_access,
};
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_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,
WLR_BUFFER_CAP_DATA_PTR | WLR_BUFFER_CAP_SHM);
wlr_log(WLR_DEBUG, "Created shm allocator");
return &allocator->base;
}
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