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weston/clients/simple-shm.c

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14 KiB

/*
* Copyright © 2011 Benjamin Franzke
* Copyright © 2010 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include "config.h"
#include <stdint.h>
#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 <errno.h>
#include <wayland-client.h>
#include "shared/os-compatibility.h"
#include <libweston/zalloc.h>
#include "xdg-shell-client-protocol.h"
#include "fullscreen-shell-unstable-v1-client-protocol.h"
struct display {
struct wl_display *display;
struct wl_registry *registry;
struct wl_compositor *compositor;
struct xdg_wm_base *wm_base;
struct zwp_fullscreen_shell_v1 *fshell;
struct wl_shm *shm;
bool has_xrgb;
};
struct buffer {
struct wl_buffer *buffer;
void *shm_data;
int busy;
};
struct window {
struct display *display;
int width, height;
struct wl_surface *surface;
struct xdg_surface *xdg_surface;
struct xdg_toplevel *xdg_toplevel;
struct buffer buffers[2];
struct buffer *prev_buffer;
struct wl_callback *callback;
bool wait_for_configure;
};
static int running = 1;
static void
redraw(void *data, struct wl_callback *callback, uint32_t time);
static void
buffer_release(void *data, struct wl_buffer *buffer)
{
struct buffer *mybuf = data;
mybuf->busy = 0;
}
static const struct wl_buffer_listener buffer_listener = {
buffer_release
};
static int
create_shm_buffer(struct display *display, struct buffer *buffer,
int width, int height, uint32_t format)
{
struct wl_shm_pool *pool;
int fd, size, stride;
void *data;
stride = width * 4;
size = stride * height;
fd = os_create_anonymous_file(size);
if (fd < 0) {
fprintf(stderr, "creating a buffer file for %d B failed: %s\n",
size, strerror(errno));
return -1;
}
data = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (data == MAP_FAILED) {
fprintf(stderr, "mmap failed: %s\n", strerror(errno));
close(fd);
return -1;
}
pool = wl_shm_create_pool(display->shm, fd, size);
buffer->buffer = wl_shm_pool_create_buffer(pool, 0,
width, height,
stride, format);
wl_buffer_add_listener(buffer->buffer, &buffer_listener, buffer);
wl_shm_pool_destroy(pool);
close(fd);
buffer->shm_data = data;
return 0;
}
static void
handle_xdg_surface_configure(void *data, struct xdg_surface *surface,
uint32_t serial)
{
struct window *window = data;
xdg_surface_ack_configure(surface, serial);
if (window->wait_for_configure) {
redraw(window, NULL, 0);
window->wait_for_configure = false;
}
}
static const struct xdg_surface_listener xdg_surface_listener = {
handle_xdg_surface_configure,
};
static void
handle_xdg_toplevel_configure(void *data, struct xdg_toplevel *xdg_toplevel,
int32_t width, int32_t height,
struct wl_array *state)
{
}
static void
handle_xdg_toplevel_close(void *data, struct xdg_toplevel *xdg_toplevel)
{
running = 0;
}
static const struct xdg_toplevel_listener xdg_toplevel_listener = {
handle_xdg_toplevel_configure,
handle_xdg_toplevel_close,
};
static struct window *
create_window(struct display *display, int width, int height)
{
struct window *window;
window = zalloc(sizeof *window);
if (!window)
return NULL;
window->callback = NULL;
window->display = display;
window->width = width;
window->height = height;
window->surface = wl_compositor_create_surface(display->compositor);
if (display->wm_base) {
window->xdg_surface =
xdg_wm_base_get_xdg_surface(display->wm_base,
window->surface);
assert(window->xdg_surface);
xdg_surface_add_listener(window->xdg_surface,
&xdg_surface_listener, window);
window->xdg_toplevel =
xdg_surface_get_toplevel(window->xdg_surface);
assert(window->xdg_toplevel);
xdg_toplevel_add_listener(window->xdg_toplevel,
&xdg_toplevel_listener, window);
xdg_toplevel_set_title(window->xdg_toplevel, "simple-shm");
xdg_toplevel_set_app_id(window->xdg_toplevel,
"org.freedesktop.weston.simple-shm");
wl_surface_commit(window->surface);
window->wait_for_configure = true;
} else if (display->fshell) {
zwp_fullscreen_shell_v1_present_surface(display->fshell,
window->surface,
ZWP_FULLSCREEN_SHELL_V1_PRESENT_METHOD_DEFAULT,
NULL);
} else {
assert(0);
}
return window;
}
static void
destroy_window(struct window *window)
{
if (window->callback)
wl_callback_destroy(window->callback);
if (window->buffers[0].buffer)
wl_buffer_destroy(window->buffers[0].buffer);
if (window->buffers[1].buffer)
wl_buffer_destroy(window->buffers[1].buffer);
if (window->xdg_toplevel)
xdg_toplevel_destroy(window->xdg_toplevel);
if (window->xdg_surface)
xdg_surface_destroy(window->xdg_surface);
wl_surface_destroy(window->surface);
free(window);
}
static struct buffer *
window_next_buffer(struct window *window)
{
struct buffer *buffer;
int ret = 0;
if (!window->buffers[0].busy)
buffer = &window->buffers[0];
else if (!window->buffers[1].busy)
buffer = &window->buffers[1];
else
return NULL;
if (!buffer->buffer) {
ret = create_shm_buffer(window->display, buffer,
window->width, window->height,
WL_SHM_FORMAT_XRGB8888);
if (ret < 0)
return NULL;
/* paint the padding */
memset(buffer->shm_data, 0xff,
window->width * window->height * 4);
}
return buffer;
}
static void
paint_pixels(void *image, int padding, int width, int height, uint32_t time)
{
const int halfh = padding + (height - padding * 2) / 2;
const int halfw = padding + (width - padding * 2) / 2;
int ir, or;
uint32_t *pixel = image;
int y;
/* squared radii thresholds */
or = (halfw < halfh ? halfw : halfh) - 8;
ir = or - 32;
or *= or;
ir *= ir;
pixel += padding * width;
for (y = padding; y < height - padding; y++) {
int x;
int y2 = (y - halfh) * (y - halfh);
pixel += padding;
for (x = padding; x < width - padding; x++) {
uint32_t v;
/* squared distance from center */
int r2 = (x - halfw) * (x - halfw) + y2;
if (r2 < ir)
v = (r2 / 32 + time / 64) * 0x0080401;
else if (r2 < or)
v = (y + time / 32) * 0x0080401;
else
v = (x + time / 16) * 0x0080401;
v &= 0x00ffffff;
/* cross if compositor uses X from XRGB as alpha */
if (abs(x - y) > 6 && abs(x + y - height) > 6)
v |= 0xff000000;
*pixel++ = v;
}
pixel += padding;
}
}
static const struct wl_callback_listener frame_listener;
static void
redraw(void *data, struct wl_callback *callback, uint32_t time)
{
struct window *window = data;
struct buffer *buffer;
buffer = window_next_buffer(window);
if (!buffer) {
fprintf(stderr,
!callback ? "Failed to create the first buffer.\n" :
"Both buffers busy at redraw(). Server bug?\n");
abort();
}
paint_pixels(buffer->shm_data, 20, window->width, window->height, time);
wl_surface_attach(window->surface, buffer->buffer, 0, 0);
wl_surface_damage(window->surface,
20, 20, window->width - 40, window->height - 40);
if (callback)
wl_callback_destroy(callback);
window->callback = wl_surface_frame(window->surface);
wl_callback_add_listener(window->callback, &frame_listener, window);
wl_surface_commit(window->surface);
buffer->busy = 1;
}
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;
if (format == WL_SHM_FORMAT_XRGB8888)
d->has_xrgb = true;
}
struct wl_shm_listener shm_listener = {
shm_format
};
static void
xdg_wm_base_ping(void *data, struct xdg_wm_base *shell, uint32_t serial)
{
xdg_wm_base_pong(shell, serial);
}
static const struct xdg_wm_base_listener xdg_wm_base_listener = {
xdg_wm_base_ping,
};
static void
registry_handle_global(void *data, struct wl_registry *registry,
uint32_t id, const char *interface, uint32_t version)
{
struct display *d = data;
if (strcmp(interface, "wl_compositor") == 0) {
d->compositor =
wl_registry_bind(registry,
id, &wl_compositor_interface, 1);
} else if (strcmp(interface, "xdg_wm_base") == 0) {
d->wm_base = wl_registry_bind(registry,
id, &xdg_wm_base_interface, 1);
xdg_wm_base_add_listener(d->wm_base, &xdg_wm_base_listener, d);
} else if (strcmp(interface, "zwp_fullscreen_shell_v1") == 0) {
d->fshell = wl_registry_bind(registry,
id, &zwp_fullscreen_shell_v1_interface, 1);
} else if (strcmp(interface, "wl_shm") == 0) {
d->shm = wl_registry_bind(registry,
id, &wl_shm_interface, 1);
wl_shm_add_listener(d->shm, &shm_listener, d);
}
}
static void
registry_handle_global_remove(void *data, struct wl_registry *registry,
uint32_t name)
{
}
static const struct wl_registry_listener registry_listener = {
registry_handle_global,
registry_handle_global_remove
};
static struct display *
create_display(void)
{
struct display *display;
display = zalloc(sizeof *display);
if (display == NULL) {
fprintf(stderr, "out of memory\n");
exit(1);
}
display->display = wl_display_connect(NULL);
assert(display->display);
display->has_xrgb = false;
display->registry = wl_display_get_registry(display->display);
wl_registry_add_listener(display->registry,
&registry_listener, display);
wl_display_roundtrip(display->display);
if (display->shm == NULL) {
fprintf(stderr, "No wl_shm global\n");
exit(1);
}
wl_display_roundtrip(display->display);
/*
* Why do we need two roundtrips here?
*
* wl_display_get_registry() sends a request to the server, to which
* the server replies by emitting the wl_registry.global events.
* The first wl_display_roundtrip() sends wl_display.sync. The server
* first processes the wl_display.get_registry which includes sending
* the global events, and then processes the sync. Therefore when the
* sync (roundtrip) returns, we are guaranteed to have received and
* processed all the global events.
*
* While we are inside the first wl_display_roundtrip(), incoming
* events are dispatched, which causes registry_handle_global() to
* be called for each global. One of these globals is wl_shm.
* registry_handle_global() sends wl_registry.bind request for the
* wl_shm global. However, wl_registry.bind request is sent after
* the first wl_display.sync, so the reply to the sync comes before
* the initial events of the wl_shm object.
*
* The initial events that get sent as a reply to binding to wl_shm
* include wl_shm.format. These tell us which pixel formats are
* supported, and we need them before we can create buffers. They
* don't change at runtime, so we receive them as part of init.
*
* When the reply to the first sync comes, the server may or may not
* have sent the initial wl_shm events. Therefore we need the second
* wl_display_roundtrip() call here.
*
* The server processes the wl_registry.bind for wl_shm first, and
* the second wl_display.sync next. During our second call to
* wl_display_roundtrip() the initial wl_shm events are received and
* processed. Finally, when the reply to the second wl_display.sync
* arrives, it guarantees we have processed all wl_shm initial events.
*
* This sequence contains two examples on how wl_display_roundtrip()
* can be used to guarantee, that all reply events to a request
* have been received and processed. This is a general Wayland
* technique.
*/
if (!display->has_xrgb) {
fprintf(stderr, "WL_SHM_FORMAT_XRGB32 not available\n");
exit(1);
}
return display;
}
static void
destroy_display(struct display *display)
{
if (display->shm)
wl_shm_destroy(display->shm);
if (display->wm_base)
xdg_wm_base_destroy(display->wm_base);
if (display->fshell)
zwp_fullscreen_shell_v1_release(display->fshell);
if (display->compositor)
wl_compositor_destroy(display->compositor);
wl_registry_destroy(display->registry);
wl_display_flush(display->display);
wl_display_disconnect(display->display);
free(display);
}
static void
signal_int(int signum)
{
running = 0;
}
int
main(int argc, char **argv)
{
struct sigaction sigint;
struct display *display;
struct window *window;
int ret = 0;
display = create_display();
window = create_window(display, 250, 250);
if (!window)
return 1;
sigint.sa_handler = signal_int;
sigemptyset(&sigint.sa_mask);
sigint.sa_flags = SA_RESETHAND;
sigaction(SIGINT, &sigint, NULL);
/* Initialise damage to full surface, so the padding gets painted */
wl_surface_damage(window->surface, 0, 0,
window->width, window->height);
if (!window->wait_for_configure)
redraw(window, NULL, 0);
while (running && ret != -1)
ret = wl_display_dispatch(display->display);
fprintf(stderr, "simple-shm exiting\n");
destroy_window(window);
destroy_display(display);
return 0;
}