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Diffstat (limited to 'clients/screenshot.c')
-rw-r--r-- | clients/screenshot.c | 309 |
1 files changed, 309 insertions, 0 deletions
diff --git a/clients/screenshot.c b/clients/screenshot.c new file mode 100644 index 00000000..2a6d9b32 --- /dev/null +++ b/clients/screenshot.c @@ -0,0 +1,309 @@ +/* + * 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 "config.h" + +#include <stdint.h> +#include <errno.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 * +xmalloc(size_t size) +{ + void *p; + + p = malloc(size); + if (p == NULL) { + fprintf(stderr, "%s: out of memory\n", + program_invocation_short_name); + exit(EXIT_FAILURE); + } + + return p; +} + +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 = xmalloc(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 void +handle_global_remove(void *data, struct wl_registry *registry, uint32_t name) +{ + /* XXX: unimplemented */ +} + +static const struct wl_registry_listener registry_listener = { + handle_global, + handle_global_remove +}; + +static struct wl_buffer * +create_shm_buffer(int width, int height, void **data_out) +{ + 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; + } + + pool = wl_shm_create_pool(shm, fd, size); + close(fd); + 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) +{ + int output_stride, buffer_stride, i; + cairo_surface_t *surface; + void *data, *d, *s; + struct screenshooter_output *output, *next; + + buffer_stride = width * 4; + + data = xmalloc(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; + + if (getenv("WAYLAND_SOCKET") == NULL) { + fprintf(stderr, "%s must be launched by weston.\n" + "Use the MOD+S shortcut to take a screenshot.\n", + program_invocation_short_name); + return -1; + } + + 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, ®istry_listener, NULL); + wl_display_dispatch(display); + 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; +} |