149 lines
3.2 KiB
C
149 lines
3.2 KiB
C
#define _POSIX_C_SOURCE 200809
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#include <assert.h>
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#include <cairo/cairo.h>
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#include <fcntl.h>
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#include <pango/pangocairo.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#include <wayland-client.h>
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#include "pool-buffer.h"
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static bool set_cloexec(int fd) {
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long flags = fcntl(fd, F_GETFD);
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if (flags == -1) {
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return false;
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}
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if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) == -1) {
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return false;
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}
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return true;
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}
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static int create_pool_file(size_t size, char **name) {
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static const char template[] = "sway-client-XXXXXX";
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const char *path = getenv("XDG_RUNTIME_DIR");
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if (path == NULL) {
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fprintf(stderr, "XDG_RUNTIME_DIR is not set\n");
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return -1;
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}
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size_t name_size = strlen(template) + 1 + strlen(path) + 1;
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*name = malloc(name_size);
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if (*name == NULL) {
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fprintf(stderr, "allocation failed\n");
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return -1;
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}
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snprintf(*name, name_size, "%s/%s", path, template);
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int fd = mkstemp(*name);
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if (fd < 0) {
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return -1;
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}
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if (!set_cloexec(fd)) {
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close(fd);
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return -1;
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}
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if (ftruncate(fd, size) < 0) {
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close(fd);
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return -1;
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}
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return fd;
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}
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static void buffer_release(void *data, struct wl_buffer *wl_buffer) {
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struct pool_buffer *buffer = data;
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buffer->busy = false;
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}
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static const struct wl_buffer_listener buffer_listener = {
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.release = buffer_release
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};
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static struct pool_buffer *create_buffer(struct wl_shm *shm,
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struct pool_buffer *buf, int32_t width, int32_t height,
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uint32_t format) {
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uint32_t stride = width * 4;
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size_t size = stride * height;
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char *name;
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int fd = create_pool_file(size, &name);
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assert(fd != -1);
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void *data = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
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struct wl_shm_pool *pool = wl_shm_create_pool(shm, fd, size);
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buf->buffer = wl_shm_pool_create_buffer(pool, 0,
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width, height, stride, format);
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wl_shm_pool_destroy(pool);
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close(fd);
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unlink(name);
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free(name);
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fd = -1;
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buf->size = size;
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buf->width = width;
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buf->height = height;
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buf->data = data;
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buf->surface = cairo_image_surface_create_for_data(data,
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CAIRO_FORMAT_ARGB32, width, height, stride);
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buf->cairo = cairo_create(buf->surface);
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buf->pango = pango_cairo_create_context(buf->cairo);
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wl_buffer_add_listener(buf->buffer, &buffer_listener, buf);
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return buf;
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}
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void destroy_buffer(struct pool_buffer *buffer) {
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if (buffer->buffer) {
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wl_buffer_destroy(buffer->buffer);
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}
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if (buffer->cairo) {
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cairo_destroy(buffer->cairo);
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}
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if (buffer->surface) {
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cairo_surface_destroy(buffer->surface);
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}
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if (buffer->pango) {
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g_object_unref(buffer->pango);
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}
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if (buffer->data) {
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munmap(buffer->data, buffer->size);
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}
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memset(buffer, 0, sizeof(struct pool_buffer));
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}
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struct pool_buffer *get_next_buffer(struct wl_shm *shm,
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struct pool_buffer pool[static 2], uint32_t width, uint32_t height) {
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struct pool_buffer *buffer = NULL;
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for (size_t i = 0; i < 2; ++i) {
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if (pool[i].busy) {
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continue;
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}
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buffer = &pool[i];
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}
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if (!buffer) {
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return NULL;
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}
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if (buffer->width != width || buffer->height != height) {
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destroy_buffer(buffer);
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}
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if (!buffer->buffer) {
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if (!create_buffer(shm, buffer, width, height,
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WL_SHM_FORMAT_ARGB8888)) {
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return NULL;
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}
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}
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buffer->busy = true;
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return buffer;
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}
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