clients/screenshot.c - weston-mtk - Git at Google

 /*
  * 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 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 = 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;

 	if (getenv("WAYLAND_SOCKET") == NULL) {
 		fprintf(stderr, "%s is must be launched by weston.\n"
 			"Use the MOD+S shortcut to take a screenshot.",
 			argv[0]);
 		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;
 }
	/*
	* 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 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 = 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;

	if (getenv("WAYLAND_SOCKET") == NULL) {
	fprintf(stderr, "%s is must be launched by weston.\n"
	"Use the MOD+S shortcut to take a screenshot.",
	argv[0]);
	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;
	}