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#define _XOPEN_SOURCE 500
#include <assert.h>
#include <cairo/cairo.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <pango/pangocairo.h>
#include <unistd.h>
#include <wayland-client.h>
#include "config.h"
#include "pool-buffer.h"
static int create_pool_file(size_t size, char **name) {
static const char template[] = "sway-client-XXXXXX";
const char *path = getenv("XDG_RUNTIME_DIR");
if (!path) {
return -1;
}
int ts = (path[strlen(path) - 1] == '/');
*name = malloc(
strlen(template) +
strlen(path) +
(ts ? 0 : 1) + 1);
sprintf(*name, "%s%s%s", path, ts ? "" : "/", template);
int fd = mkstemp(*name);
if (fd < 0) {
return -1;
}
if (ftruncate(fd, size) < 0) {
close(fd);
return -1;
}
return fd;
}
static void buffer_release(void *data, struct wl_buffer *wl_buffer) {
struct pool_buffer *buffer = data;
buffer->busy = false;
}
static const struct wl_buffer_listener buffer_listener = {
.release = buffer_release
};
static struct pool_buffer *create_buffer(struct wl_shm *shm,
struct pool_buffer *buf, int32_t width, int32_t height,
uint32_t format) {
uint32_t stride = width * 4;
uint32_t size = stride * height;
char *name;
int fd = create_pool_file(size, &name);
assert(fd);
void *data = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
struct wl_shm_pool *pool = wl_shm_create_pool(shm, fd, size);
buf->buffer = wl_shm_pool_create_buffer(pool, 0,
width, height, stride, format);
wl_shm_pool_destroy(pool);
close(fd);
unlink(name);
free(name);
fd = -1;
buf->width = width;
buf->height = height;
buf->surface = cairo_image_surface_create_for_data(data,
CAIRO_FORMAT_ARGB32, width, height, stride);
buf->cairo = cairo_create(buf->surface);
buf->pango = pango_cairo_create_context(buf->cairo);
wl_buffer_add_listener(buf->buffer, &buffer_listener, buf);
return buf;
}
static void destroy_buffer(struct pool_buffer *buffer) {
if (buffer->buffer) {
wl_buffer_destroy(buffer->buffer);
}
if (buffer->cairo) {
cairo_destroy(buffer->cairo);
}
if (buffer->surface) {
cairo_surface_destroy(buffer->surface);
}
if (buffer->pango) {
g_object_unref(buffer->pango);
}
memset(buffer, 0, sizeof(struct pool_buffer));
}
struct pool_buffer *get_next_buffer(struct wl_shm *shm,
struct pool_buffer pool[static 2], uint32_t width, uint32_t height) {
struct pool_buffer *buffer = NULL;
for (size_t i = 0; i < 2; ++i) {
if (pool[i].busy) {
continue;
}
buffer = &pool[i];
}
if (!buffer) {
return NULL;
}
if (buffer->width != width || buffer->height != height) {
destroy_buffer(buffer);
}
if (!buffer->buffer) {
if (!create_buffer(shm, buffer, width, height,
WL_SHM_FORMAT_ARGB8888)) {
return NULL;
}
}
return buffer;
}
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