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, &registry_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;
+}