weston/clients/simple-shm.c

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/*
* Copyright © 2011 Benjamin Franzke
* Copyright © 2010 Intel Corporation
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting documentation, and
* that the name of the copyright holders not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. The copyright holders make no representations
* about the suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <assert.h>
#include <unistd.h>
#include <sys/mman.h>
#include <signal.h>
#include <wayland-client.h>
#include <wayland-egl.h>
struct display {
struct wl_display *display;
struct wl_compositor *compositor;
struct wl_shell *shell;
struct wl_shm *shm;
uint32_t formats;
uint32_t mask;
};
struct window {
struct display *display;
int width, height;
struct wl_surface *surface;
struct wl_shell_surface *shell_surface;
struct wl_buffer *buffer;
void *shm_data;
struct wl_callback *callback;
};
static struct wl_buffer *
create_shm_buffer(struct display *display,
int width, int height, uint32_t format, void **data_out)
{
char filename[] = "/tmp/wayland-shm-XXXXXX";
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struct wl_shm_pool *pool;
struct wl_buffer *buffer;
int fd, size, stride;
void *data;
fd = mkstemp(filename);
if (fd < 0) {
fprintf(stderr, "open %s failed: %m\n", filename);
return NULL;
}
stride = width * 4;
size = stride * height;
if (ftruncate(fd, size) < 0) {
fprintf(stderr, "ftruncate failed: %m\n");
close(fd);
return NULL;
}
data = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
unlink(filename);
if (data == MAP_FAILED) {
fprintf(stderr, "mmap failed: %m\n");
close(fd);
return NULL;
}
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pool = wl_shm_create_pool(display->shm, fd, size);
buffer = wl_shm_pool_create_buffer(pool, 0,
width, height, stride, format);
wl_shm_pool_destroy(pool);
close(fd);
*data_out = data;
return buffer;
}
static struct window *
create_window(struct display *display, int width, int height)
{
struct window *window;
window = malloc(sizeof *window);
window->callback = NULL;
window->display = display;
window->width = width;
window->height = height;
window->surface = wl_compositor_create_surface(display->compositor);
window->shell_surface = wl_shell_get_shell_surface(display->shell,
window->surface);
window->buffer = create_shm_buffer(display,
width, height,
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WL_SHM_FORMAT_XRGB8888,
&window->shm_data);
wl_shell_surface_set_toplevel(window->shell_surface);
return window;
}
static void
destroy_window(struct window *window)
{
if (window->callback)
wl_callback_destroy(window->callback);
wl_buffer_destroy(window->buffer);
wl_shell_surface_destroy(window->shell_surface);
wl_surface_destroy(window->surface);
free(window);
}
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static const struct wl_callback_listener frame_listener;
static void
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redraw(void *data, struct wl_callback *callback, uint32_t time)
{
struct window *window = data;
uint32_t *p;
int i, end, offset;
p = window->shm_data;
end = window->width * window->height;
offset = time >> 4;
for (i = 0; i < end; i++)
p[i] = (i + offset) * 0x0080401;
wl_surface_attach(window->surface, window->buffer, 0, 0);
wl_surface_damage(window->surface,
0, 0, window->width, window->height);
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if (callback)
wl_callback_destroy(callback);
window->callback = wl_surface_frame(window->surface);
wl_callback_add_listener(window->callback, &frame_listener, window);
}
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static const struct wl_callback_listener frame_listener = {
redraw
};
static void
shm_format(void *data, struct wl_shm *wl_shm, uint32_t format)
{
struct display *d = data;
d->formats |= (1 << format);
}
struct wl_shm_listener shm_listenter = {
shm_format
};
static void
display_handle_global(struct wl_display *display, uint32_t id,
const char *interface, uint32_t version, void *data)
{
struct display *d = data;
if (strcmp(interface, "wl_compositor") == 0) {
d->compositor =
wl_display_bind(display, id, &wl_compositor_interface);
} else if (strcmp(interface, "wl_shell") == 0) {
d->shell = wl_display_bind(display, id, &wl_shell_interface);
} else if (strcmp(interface, "wl_shm") == 0) {
d->shm = wl_display_bind(display, id, &wl_shm_interface);
wl_shm_add_listener(d->shm, &shm_listenter, d);
}
}
static int
event_mask_update(uint32_t mask, void *data)
{
struct display *d = data;
d->mask = mask;
return 0;
}
static struct display *
create_display(void)
{
struct display *display;
display = malloc(sizeof *display);
display->display = wl_display_connect(NULL);
assert(display->display);
display->formats = 0;
wl_display_add_global_listener(display->display,
display_handle_global, display);
wl_display_iterate(display->display, WL_DISPLAY_READABLE);
wl_display_roundtrip(display->display);
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if (!(display->formats & (1 << WL_SHM_FORMAT_XRGB8888))) {
fprintf(stderr, "WL_SHM_FORMAT_XRGB32 not available\n");
exit(1);
}
wl_display_get_fd(display->display, event_mask_update, display);
return display;
}
static void
destroy_display(struct display *display)
{
if (display->shm)
wl_shm_destroy(display->shm);
if (display->shell)
wl_shell_destroy(display->shell);
if (display->compositor)
wl_compositor_destroy(display->compositor);
wl_display_flush(display->display);
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wl_display_disconnect(display->display);
free(display);
}
static int running = 1;
static void
signal_int(int signum)
{
running = 0;
}
int
main(int argc, char **argv)
{
struct sigaction sigint;
struct display *display;
struct window *window;
display = create_display();
window = create_window(display, 250, 250);
sigint.sa_handler = signal_int;
sigemptyset(&sigint.sa_mask);
sigint.sa_flags = SA_RESETHAND;
sigaction(SIGINT, &sigint, NULL);
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redraw(window, NULL, 0);
while (running)
wl_display_iterate(display->display, display->mask);
fprintf(stderr, "simple-shm exiting\n");
destroy_window(window);
destroy_display(display);
return 0;
}