weston/clients/screenshot.c

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2008-12-02 23:15:01 +03:00
/*
* Copyright © 2008 Kristian Høgsberg
*
* 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 <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <limits.h>
#include <sys/param.h>
#include <sys/mman.h>
#include <cairo.h>
#include <wayland-client.h>
#include "screenshooter-client-protocol.h"
#include "../shared/os-compatibility.h"
/* The screenshooter is a good example of a custom object exposed by
* the compositor and serves as a test bed for implementing client
* side marshalling outside libwayland.so */
static struct wl_shm *shm;
static struct screenshooter *screenshooter;
static struct wl_list output_list;
int min_x, min_y, max_x, max_y;
int buffer_copy_done;
struct screenshooter_output {
struct wl_output *output;
struct wl_buffer *buffer;
int width, height, offset_x, offset_y;
void *data;
struct wl_list link;
};
static void
display_handle_geometry(void *data,
struct wl_output *wl_output,
int x,
int y,
int physical_width,
int physical_height,
int subpixel,
const char *make,
const char *model,
int transform)
{
struct screenshooter_output *output;
output = wl_output_get_user_data(wl_output);
if (wl_output == output->output) {
output->offset_x = x;
output->offset_y = y;
}
}
static void
display_handle_mode(void *data,
struct wl_output *wl_output,
uint32_t flags,
int width,
int height,
int refresh)
{
struct screenshooter_output *output;
output = wl_output_get_user_data(wl_output);
if (wl_output == output->output && (flags & WL_OUTPUT_MODE_CURRENT)) {
output->width = width;
output->height = height;
}
}
static const struct wl_output_listener output_listener = {
display_handle_geometry,
display_handle_mode
};
static void
screenshot_done(void *data, struct screenshooter *screenshooter)
{
buffer_copy_done = 1;
}
static const struct screenshooter_listener screenshooter_listener = {
screenshot_done
};
static void
handle_global(void *data, struct wl_registry *registry,
uint32_t name, const char *interface, uint32_t version)
{
static struct screenshooter_output *output;
if (strcmp(interface, "wl_output") == 0) {
output = malloc(sizeof *output);
output->output = wl_registry_bind(registry, name,
&wl_output_interface, 1);
wl_list_insert(&output_list, &output->link);
wl_output_add_listener(output->output, &output_listener, output);
} else if (strcmp(interface, "wl_shm") == 0) {
shm = wl_registry_bind(registry, name, &wl_shm_interface, 1);
} else if (strcmp(interface, "screenshooter") == 0) {
screenshooter = wl_registry_bind(registry, name,
&screenshooter_interface, 1);
}
}
static const struct wl_registry_listener registry_listener = {
handle_global
};
static struct wl_buffer *
create_shm_buffer(int width, int height, void **data_out)
{
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struct wl_shm_pool *pool;
struct wl_buffer *buffer;
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: %m\n",
size);
return NULL;
}
data = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (data == MAP_FAILED) {
fprintf(stderr, "mmap failed: %m\n");
close(fd);
return NULL;
}
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pool = wl_shm_create_pool(shm, fd, size);
close(fd);
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buffer = wl_shm_pool_create_buffer(pool, 0, width, height, stride,
WL_SHM_FORMAT_XRGB8888);
wl_shm_pool_destroy(pool);
*data_out = data;
return buffer;
}
static void
write_png(int width, int height)
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{
int output_stride, buffer_stride, i;
cairo_surface_t *surface;
void *data, *d, *s;
struct screenshooter_output *output, *next;
buffer_stride = width * 4;
data = malloc(buffer_stride * height);
if (!data)
return;
wl_list_for_each_safe(output, next, &output_list, link) {
output_stride = output->width * 4;
s = output->data;
d = data + (output->offset_y - min_y) * buffer_stride +
(output->offset_x - min_x) * 4;
for (i = 0; i < output->height; i++) {
memcpy(d, s, output_stride);
d += buffer_stride;
s += output_stride;
}
free(output);
}
surface = cairo_image_surface_create_for_data(data,
CAIRO_FORMAT_ARGB32,
width, height, buffer_stride);
cairo_surface_write_to_png(surface, "wayland-screenshot.png");
cairo_surface_destroy(surface);
free(data);
}
static int
set_buffer_size(int *width, int *height)
{
struct screenshooter_output *output;
min_x = min_y = INT_MAX;
max_x = max_y = INT_MIN;
int position = 0;
wl_list_for_each_reverse(output, &output_list, link) {
output->offset_x = position;
position += output->width;
}
wl_list_for_each(output, &output_list, link) {
min_x = MIN(min_x, output->offset_x);
min_y = MIN(min_y, output->offset_y);
max_x = MAX(max_x, output->offset_x + output->width);
max_y = MAX(max_y, output->offset_y + output->height);
}
if (max_x <= min_x || max_y <= min_y)
return -1;
*width = max_x - min_x;
*height = max_y - min_y;
return 0;
}
int main(int argc, char *argv[])
{
struct wl_display *display;
struct wl_registry *registry;
struct screenshooter_output *output;
int width, height;
display = wl_display_connect(NULL);
if (display == NULL) {
fprintf(stderr, "failed to create display: %m\n");
return -1;
}
wl_list_init(&output_list);
registry = wl_display_get_registry(display);
wl_registry_add_listener(registry, &registry_listener, NULL);
wl_display_dispatch(display);
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wl_display_roundtrip(display);
if (screenshooter == NULL) {
fprintf(stderr, "display doesn't support screenshooter\n");
return -1;
}
screenshooter_add_listener(screenshooter, &screenshooter_listener, screenshooter);
if (set_buffer_size(&width, &height))
return -1;
wl_list_for_each(output, &output_list, link) {
output->buffer = create_shm_buffer(output->width, output->height, &output->data);
screenshooter_shoot(screenshooter, output->output, output->buffer);
buffer_copy_done = 0;
while (!buffer_copy_done)
wl_display_roundtrip(display);
}
write_png(width, height);
return 0;
}