Merge pull request #120 from acrisci/feature/wlr-cursor

wlr_cursor

.gitignore

@@ -12,3 +12,4 @@ test/
 build/
 .lvimrc
 wayland-*-protocol.*
+wlr-example.ini

backend/drm/drm.c

@@ -598,6 +598,8 @@ static bool wlr_drm_output_set_cursor(struct wlr_output *_output,
 		wlr_matrix_texture(plane->matrix, plane->width, plane->height,
 			output->output.transform ^ WL_OUTPUT_TRANSFORM_FLIPPED_180);
 
+		// TODO the image needs to be rotated depending on the output rotation
+
 		plane->wlr_rend = wlr_gles2_renderer_create(&backend->backend);
 		if (!plane->wlr_rend) {
 			return false;
@@ -651,6 +653,31 @@ static bool wlr_drm_output_move_cursor(struct wlr_output *_output,
 	struct wlr_drm_output *output = (struct wlr_drm_output *)_output;
 	struct wlr_drm_backend *backend =
 		wl_container_of(output->renderer, backend, renderer);
+
+	int width, height, tmp;
+	wlr_output_effective_resolution(_output, &width, &height);
+
+	switch (_output->transform) {
+	case WL_OUTPUT_TRANSFORM_NORMAL:
+		// nothing to do
+		break;
+	case WL_OUTPUT_TRANSFORM_270:
+		tmp = x;
+		x = y;
+		y = -(tmp - width);
+		break;
+	case WL_OUTPUT_TRANSFORM_90:
+		tmp = x;
+		x = -(y - height);
+		y = tmp;
+		break;
+	default:
+		// TODO other transformations
+		wlr_log(L_ERROR, "TODO: handle surface to crtc for transformation = %d",
+			_output->transform);
+		break;
+	}
+
 	return backend->iface->crtc_move_cursor(backend, output->crtc, x, y);
 }
 

backend/libinput/pointer.c

@@ -30,6 +30,7 @@ void handle_pointer_motion(struct libinput_event *event,
 	struct libinput_event_pointer *pevent =
 		libinput_event_get_pointer_event(event);
 	struct wlr_event_pointer_motion wlr_event = { 0 };
+	wlr_event.device = wlr_dev;
 	wlr_event.time_sec = libinput_event_pointer_get_time(pevent);
 	wlr_event.time_usec = libinput_event_pointer_get_time_usec(pevent);
 	wlr_event.delta_x = libinput_event_pointer_get_dx(pevent);
@@ -48,6 +49,7 @@ void handle_pointer_motion_abs(struct libinput_event *event,
 	struct libinput_event_pointer *pevent =
 		libinput_event_get_pointer_event(event);
 	struct wlr_event_pointer_motion_absolute wlr_event = { 0 };
+	wlr_event.device = wlr_dev;
 	wlr_event.time_sec = libinput_event_pointer_get_time(pevent);
 	wlr_event.time_usec = libinput_event_pointer_get_time_usec(pevent);
 	wlr_event.x_mm = libinput_event_pointer_get_absolute_x(pevent);
@@ -67,6 +69,7 @@ void handle_pointer_button(struct libinput_event *event,
 	struct libinput_event_pointer *pevent =
 		libinput_event_get_pointer_event(event);
 	struct wlr_event_pointer_button wlr_event = { 0 };
+	wlr_event.device = wlr_dev;
 	wlr_event.time_sec = libinput_event_pointer_get_time(pevent);
 	wlr_event.time_usec = libinput_event_pointer_get_time_usec(pevent);
 	wlr_event.button = libinput_event_pointer_get_button(pevent);
@@ -92,6 +95,7 @@ void handle_pointer_axis(struct libinput_event *event,
 	struct libinput_event_pointer *pevent =
 		libinput_event_get_pointer_event(event);
 	struct wlr_event_pointer_axis wlr_event = { 0 };
+	wlr_event.device = wlr_dev;
 	wlr_event.time_sec = libinput_event_pointer_get_time(pevent);
 	wlr_event.time_usec = libinput_event_pointer_get_time_usec(pevent);
 	switch (libinput_event_pointer_get_axis_source(pevent)) {

backend/libinput/tablet_tool.c

@@ -30,6 +30,7 @@ void handle_tablet_tool_axis(struct libinput_event *event,
 	struct libinput_event_tablet_tool *tevent =
 		libinput_event_get_tablet_tool_event(event);
 	struct wlr_event_tablet_tool_axis wlr_event = { 0 };
+	wlr_event.device = wlr_dev;
 	wlr_event.time_sec = libinput_event_tablet_tool_get_time(tevent);
 	wlr_event.time_usec = libinput_event_tablet_tool_get_time_usec(tevent);
 	libinput_device_get_size(libinput_dev, &wlr_event.width_mm, &wlr_event.height_mm);
@@ -83,6 +84,7 @@ void handle_tablet_tool_proximity(struct libinput_event *event,
 	struct libinput_event_tablet_tool *tevent =
 		libinput_event_get_tablet_tool_event(event);
 	struct wlr_event_tablet_tool_proximity wlr_event = { 0 };
+	wlr_event.device = wlr_dev;
 	wlr_event.time_sec = libinput_event_tablet_tool_get_time(tevent);
 	wlr_event.time_usec = libinput_event_tablet_tool_get_time_usec(tevent);
 	switch (libinput_event_tablet_tool_get_proximity_state(tevent)) {
@@ -109,6 +111,7 @@ void handle_tablet_tool_tip(struct libinput_event *event,
 	struct libinput_event_tablet_tool *tevent =
 		libinput_event_get_tablet_tool_event(event);
 	struct wlr_event_tablet_tool_tip wlr_event = { 0 };
+	wlr_event.device = wlr_dev;
 	wlr_event.time_sec = libinput_event_tablet_tool_get_time(tevent);
 	wlr_event.time_usec = libinput_event_tablet_tool_get_time_usec(tevent);
 	switch (libinput_event_tablet_tool_get_tip_state(tevent)) {
@@ -134,6 +137,7 @@ void handle_tablet_tool_button(struct libinput_event *event,
 	struct libinput_event_tablet_tool *tevent =
 		libinput_event_get_tablet_tool_event(event);
 	struct wlr_event_tablet_tool_button wlr_event = { 0 };
+	wlr_event.device = wlr_dev;
 	wlr_event.time_sec = libinput_event_tablet_tool_get_time(tevent);
 	wlr_event.time_usec = libinput_event_tablet_tool_get_time_usec(tevent);
 	wlr_event.button = libinput_event_tablet_tool_get_button(tevent);

backend/libinput/touch.c

@@ -30,6 +30,7 @@ void handle_touch_down(struct libinput_event *event,
 	struct libinput_event_touch *tevent =
 		libinput_event_get_touch_event(event);
 	struct wlr_event_touch_down wlr_event = { 0 };
+	wlr_event.device = wlr_dev;
 	wlr_event.time_sec = libinput_event_touch_get_time(tevent);
 	wlr_event.time_usec = libinput_event_touch_get_time_usec(tevent);
 	wlr_event.slot = libinput_event_touch_get_slot(tevent);
@@ -50,6 +51,7 @@ void handle_touch_up(struct libinput_event *event,
 	struct libinput_event_touch *tevent =
 		libinput_event_get_touch_event(event);
 	struct wlr_event_touch_up wlr_event = { 0 };
+	wlr_event.device = wlr_dev;
 	wlr_event.time_sec = libinput_event_touch_get_time(tevent);
 	wlr_event.time_usec = libinput_event_touch_get_time_usec(tevent);
 	wlr_event.slot = libinput_event_touch_get_slot(tevent);
@@ -67,6 +69,7 @@ void handle_touch_motion(struct libinput_event *event,
 	struct libinput_event_touch *tevent =
 		libinput_event_get_touch_event(event);
 	struct wlr_event_touch_motion wlr_event = { 0 };
+	wlr_event.device = wlr_dev;
 	wlr_event.time_sec = libinput_event_touch_get_time(tevent);
 	wlr_event.time_usec = libinput_event_touch_get_time_usec(tevent);
 	wlr_event.slot = libinput_event_touch_get_slot(tevent);
@@ -87,6 +90,7 @@ void handle_touch_cancel(struct libinput_event *event,
 	struct libinput_event_touch *tevent =
 		libinput_event_get_touch_event(event);
 	struct wlr_event_touch_cancel wlr_event = { 0 };
+	wlr_event.device = wlr_dev;
 	wlr_event.time_sec = libinput_event_touch_get_time(tevent);
 	wlr_event.time_usec = libinput_event_touch_get_time_usec(tevent);
 	wlr_event.slot = libinput_event_touch_get_slot(tevent);

backend/wayland/wl_seat.c

@@ -51,6 +51,7 @@ static void pointer_handle_motion(void *data, struct wl_pointer *wl_pointer,
 	wl_egl_window_get_attached_size(wlr_wl_pointer->current_output->egl_window,
 		&width, &height);
 	struct wlr_event_pointer_motion_absolute wlr_event;
+	wlr_event.device = dev;
 	wlr_event.time_sec = time / 1000;
 	wlr_event.time_usec = time * 1000;
 	wlr_event.width_mm = width;
@@ -66,6 +67,7 @@ static void pointer_handle_button(void *data, struct wl_pointer *wl_pointer,
 	assert(dev && dev->pointer);
 
 	struct wlr_event_pointer_button wlr_event;
+	wlr_event.device = dev;
 	wlr_event.button = button;
 	wlr_event.state = state;
 	wlr_event.time_sec = time / 1000;
@@ -80,6 +82,7 @@ static void pointer_handle_axis(void *data, struct wl_pointer *wl_pointer,
 	struct wlr_wl_pointer *wlr_wl_pointer = (struct wlr_wl_pointer *)dev->pointer;
 
 	struct wlr_event_pointer_axis wlr_event;
+	wlr_event.device = dev;
 	wlr_event.delta = value;
 	wlr_event.orientation = axis;
 	wlr_event.time_sec = time / 1000;

examples/config.c

@@ -0,0 +1,303 @@
+#ifndef _POSIX_C_SOURCE
+#define _POSIX_C_SOURCE 200809L
+#endif
+#include <stdlib.h>
+#include <limits.h>
+#include <getopt.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/param.h>
+#include <wlr/util/log.h>
+#include <wlr/types/wlr_box.h>
+#include "shared.h"
+#include "config.h"
+#include "ini.h"
+
+static void usage(const char *name, int ret) {
+	fprintf(stderr,
+		"usage: %s [-C <FILE>]\n"
+		"\n"
+		" -C <FILE>      Path to the configuration file\n"
+		"                (default: wlr-example.ini).\n"
+		"                See `examples/wlr-example.ini.example` for config\n"
+		"                file documentation.\n", name);
+
+	exit(ret);
+}
+
+static struct wlr_box *parse_geometry(const char *str) {
+	// format: {width}x{height}+{x}+{y}
+	if (strlen(str) > 255) {
+		wlr_log(L_ERROR, "cannot parse geometry string, too long");
+		return NULL;
+	}
+
+	char *buf = strdup(str);
+	struct wlr_box *box = calloc(1, sizeof(struct wlr_box));
+
+	bool has_width = false;
+	bool has_height = false;
+	bool has_x = false;
+	bool has_y = false;
+
+	char *pch = strtok(buf, "x+");
+	while (pch != NULL) {
+		errno = 0;
+		char *endptr;
+		long val = strtol(pch, &endptr, 0);
+
+		if ((errno == ERANGE && (val == LONG_MAX || val == LONG_MIN)) ||
+				(errno != 0 && val == 0)) {
+			goto invalid_input;
+		}
+
+		if (endptr == pch) {
+			goto invalid_input;
+		}
+
+		if (!has_width) {
+			box->width = val;
+			has_width = true;
+		} else if (!has_height) {
+			box->height = val;
+			has_height = true;
+		} else if (!has_x) {
+			box->x = val;
+			has_x = true;
+		} else if (!has_y) {
+			box->y = val;
+			has_y = true;
+		} else {
+			break;
+		}
+		pch = strtok(NULL, "x+");
+	}
+
+	if (!has_width || !has_height) {
+		goto invalid_input;
+	}
+
+	free(buf);
+	return box;
+
+invalid_input:
+	wlr_log(L_ERROR, "could not parse geometry string: %s", str);
+	free(buf);
+	free(box);
+	return NULL;
+}
+
+static const char *output_prefix = "output:";
+static const char *device_prefix = "device:";
+
+static int config_ini_handler(void *user, const char *section, const char *name,
+		const char *value) {
+	struct example_config *config = user;
+	if (strncmp(output_prefix, section, strlen(output_prefix)) == 0) {
+		const char *output_name = section + strlen(output_prefix);
+		struct output_config *oc;
+		bool found = false;
+
+		wl_list_for_each(oc, &config->outputs, link) {
+			if (strcmp(oc->name, output_name) == 0) {
+				found = true;
+				break;
+			}
+		}
+
+		if (!found) {
+			oc = calloc(1, sizeof(struct output_config));
+			oc->name = strdup(output_name);
+			oc->transform = WL_OUTPUT_TRANSFORM_NORMAL;
+			wl_list_insert(&config->outputs, &oc->link);
+		}
+
+		if (strcmp(name, "x") == 0) {
+			oc->x = strtol(value, NULL, 10);
+		} else if (strcmp(name, "y") == 0) {
+			oc->y = strtol(value, NULL, 10);
+		} else if (strcmp(name, "rotate") == 0) {
+			if (strcmp(value, "90") == 0) {
+				oc->transform = WL_OUTPUT_TRANSFORM_90;
+			} else if (strcmp(value, "180") == 0) {
+				oc->transform = WL_OUTPUT_TRANSFORM_180;
+			} else if (strcmp(value, "270") == 0) {
+				oc->transform = WL_OUTPUT_TRANSFORM_270;
+			} else if (strcmp(value, "flipped") == 0) {
+				oc->transform = WL_OUTPUT_TRANSFORM_FLIPPED;
+			} else if (strcmp(value, "flipped-90") == 0) {
+				oc->transform = WL_OUTPUT_TRANSFORM_FLIPPED_90;
+			} else if (strcmp(value, "flipped-180") == 0) {
+				oc->transform = WL_OUTPUT_TRANSFORM_FLIPPED_180;
+			} else if (strcmp(value, "flipped-270") == 0) {
+				oc->transform = WL_OUTPUT_TRANSFORM_FLIPPED_270;
+			} else {
+				wlr_log(L_ERROR, "got unknown transform value: %s", value);
+			}
+		}
+	} else if (strcmp(section, "cursor") == 0) {
+		if (strcmp(name, "map-to-output") == 0) {
+			free(config->cursor.mapped_output);
+			config->cursor.mapped_output = strdup(value);
+		} else if (strcmp(name, "geometry") == 0) {
+			free(config->cursor.mapped_box);
+			config->cursor.mapped_box = parse_geometry(value);
+		} else {
+			wlr_log(L_ERROR, "got unknown cursor config: %s", name);
+		}
+	} else if (strncmp(device_prefix, section, strlen(device_prefix)) == 0) {
+		const char *device_name = section + strlen(device_prefix);
+		struct device_config *dc;
+		bool found = false;
+
+		wl_list_for_each(dc, &config->devices, link) {
+			if (strcmp(dc->name, device_name) == 0) {
+				found = true;
+				break;
+			}
+		}
+
+		if (!found) {
+			dc = calloc(1, sizeof(struct device_config));
+			dc->name = strdup(device_name);
+			wl_list_insert(&config->devices, &dc->link);
+		}
+
+		if (strcmp(name, "map-to-output") == 0) {
+			free(dc->mapped_output);
+			dc->mapped_output = strdup(value);
+		} else if (strcmp(name, "geometry") == 0) {
+			free(dc->mapped_box);
+			dc->mapped_box = parse_geometry(value);
+		} else {
+			wlr_log(L_ERROR, "got unknown device config: %s", name);
+		}
+	} else {
+		wlr_log(L_ERROR, "got unknown config section: %s", section);
+	}
+
+	return 1;
+}
+
+struct example_config *parse_args(int argc, char *argv[]) {
+	struct example_config *config = calloc(1, sizeof(struct example_config));
+	wl_list_init(&config->outputs);
+	wl_list_init(&config->devices);
+
+	int c;
+	while ((c = getopt(argc, argv, "C:h")) != -1) {
+		switch (c) {
+		case 'C':
+			config->config_path = strdup(optarg);
+			break;
+		case 'h':
+		case '?':
+			usage(argv[0], c != 'h');
+		}
+	}
+
+	if (!config->config_path) {
+		// get the config path from the current directory
+		char cwd[MAXPATHLEN];
+		if (getcwd(cwd, sizeof(cwd)) != NULL) {
+			char buf[MAXPATHLEN];
+			snprintf(buf, MAXPATHLEN, "%s/%s", cwd, "wlr-example.ini");
+			config->config_path = strdup(buf);
+		} else {
+			wlr_log(L_ERROR, "could not get cwd");
+			exit(1);
+		}
+	}
+
+	int result = ini_parse(config->config_path, config_ini_handler, config);
+
+	if (result == -1) {
+		wlr_log(L_DEBUG, "No config file found. Using empty config.");
+	} else if (result == -2) {
+		wlr_log(L_ERROR, "Could not allocate memory to parse config file");
+		exit(1);
+	} else if (result != 0) {
+		wlr_log(L_ERROR, "Could not parse config file");
+		exit(1);
+	}
+
+	return config;
+}
+
+void example_config_destroy(struct example_config *config) {
+	struct output_config *oc, *otmp = NULL;
+	wl_list_for_each_safe(oc, otmp, &config->outputs, link) {
+		free(oc->name);
+		free(oc);
+	}
+
+	struct device_config *dc, *dtmp = NULL;
+	wl_list_for_each_safe(dc, dtmp, &config->devices, link) {
+		free(dc->name);
+		if (dc->mapped_output) {
+			free(dc->mapped_output);
+		}
+		if (dc->mapped_box) {
+			free(dc->mapped_box);
+		}
+		free(dc);
+	}
+
+	if (config->config_path) {
+		free(config->config_path);
+	}
+	if (config->cursor.mapped_output) {
+		free(config->cursor.mapped_output);
+	}
+	if (config->cursor.mapped_box) {
+		free(config->cursor.mapped_box);
+	}
+	free(config);
+}
+
+struct wlr_output_layout *configure_layout(struct example_config *config,
+		struct wl_list *outputs) {
+	struct wlr_output_layout *layout = wlr_output_layout_init();
+	int max_x = INT_MIN;
+	int max_x_y = INT_MIN; // y value for the max_x output
+
+	// first add all the configured outputs
+	struct output_state *output;
+	wl_list_for_each(output, outputs, link) {
+		struct output_config *conf;
+		wl_list_for_each(conf, &config->outputs, link) {
+			if (strcmp(conf->name, output->output->name) == 0) {
+				wlr_output_layout_add(layout, output->output,
+						conf->x, conf->y);
+				wlr_output_transform(output->output, conf->transform);
+				int width, height;
+				wlr_output_effective_resolution(output->output, &width,
+					&height);
+				if (conf->x + width > max_x) {
+					max_x = conf->x + width;
+					max_x_y = conf->y;
+				}
+				break;
+			}
+		}
+	}
+
+	if (max_x == INT_MIN) {
+		// couldn't find a configured output
+		max_x = 0;
+		max_x_y = 0;
+	}
+
+	// now add all the other configured outputs in a sensible position
+	wl_list_for_each(output, outputs, link) {
+		if (wlr_output_layout_get(layout, output->output)) {
+			continue;
+		}
+		wlr_output_layout_add(layout, output->output, max_x, max_x_y);
+		int width, height;
+		wlr_output_effective_resolution(output->output, &width, &height);
+		max_x += width;
+	}
+
+	return layout;
+}

examples/config.h

@@ -0,0 +1,39 @@
+#ifndef _EXAMPLE_CONFIG_H
+#define _EXAMPLE_CONFIG_H
+#ifndef _POSIX_C_SOURCE
+#define _POSIX_C_SOURCE 200112L
+#endif
+#include <wlr/types/wlr_output_layout.h>
+
+struct output_config {
+	char *name;
+	enum wl_output_transform transform;
+	int x, y;
+	struct wl_list link;
+};
+
+struct device_config {
+	char *name;
+	char *mapped_output;
+	struct wlr_box *mapped_box;
+	struct wl_list link;
+};
+
+struct example_config {
+	struct {
+		char *mapped_output;
+		struct wlr_box *mapped_box;
+	} cursor;
+
+	struct wl_list outputs;
+	struct wl_list devices;
+	char *config_path;
+};
+
+struct example_config *parse_args(int argc, char *argv[]);
+
+void example_config_destroy(struct example_config *config);
+
+struct wlr_output_layout *configure_layout(struct example_config *config,
+		struct wl_list *outputs);
+#endif

examples/ini.c

@@ -0,0 +1,195 @@
+/* inih -- simple .INI file parser
+
+inih is released under the New BSD license (see LICENSE.txt). Go to the project
+home page for more info:
+
+https://github.com/benhoyt/inih
+
+*/
+
+#if defined(_MSC_VER) && !defined(_CRT_SECURE_NO_WARNINGS)
+#define _CRT_SECURE_NO_WARNINGS
+#endif
+
+#include <stdio.h>
+#include <ctype.h>
+#include <string.h>
+
+#include "ini.h"
+
+#if !INI_USE_STACK
+#include <stdlib.h>
+#endif
+
+#define MAX_SECTION 50
+#define MAX_NAME 50
+
+/* Strip whitespace chars off end of given string, in place. Return s. */
+static char* rstrip(char* s)
+{
+    char* p = s + strlen(s);
+    while (p > s && isspace((unsigned char)(*--p)))
+        *p = '\0';
+    return s;
+}
+
+/* Return pointer to first non-whitespace char in given string. */
+static char* lskip(const char* s)
+{
+    while (*s && isspace((unsigned char)(*s)))
+        s++;
+    return (char*)s;
+}
+
+/* Return pointer to first char (of chars) or inline comment in given string,
+   or pointer to null at end of string if neither found. Inline comment must
+   be prefixed by a whitespace character to register as a comment. */
+static char* find_chars_or_comment(const char* s, const char* chars)
+{
+#if INI_ALLOW_INLINE_COMMENTS
+    int was_space = 0;
+    while (*s && (!chars || !strchr(chars, *s)) &&
+           !(was_space && strchr(INI_INLINE_COMMENT_PREFIXES, *s))) {
+        was_space = isspace((unsigned char)(*s));
+        s++;
+    }
+#else
+    while (*s && (!chars || !strchr(chars, *s))) {
+        s++;
+    }
+#endif
+    return (char*)s;
+}
+
+/* Version of strncpy that ensures dest (size bytes) is null-terminated. */
+static char* strncpy0(char* dest, const char* src, size_t size)
+{
+    strncpy(dest, src, size);
+    dest[size - 1] = '\0';
+    return dest;
+}
+
+/* See documentation in header file. */
+int ini_parse_stream(ini_reader reader, void* stream, ini_handler handler,
+                     void* user)
+{
+    /* Uses a fair bit of stack (use heap instead if you need to) */
+#if INI_USE_STACK
+    char line[INI_MAX_LINE];
+#else
+    char* line;
+#endif
+    char section[MAX_SECTION] = "";
+    char prev_name[MAX_NAME] = "";
+
+    char* start;
+    char* end;
+    char* name;
+    char* value;
+    int lineno = 0;
+    int error = 0;
+
+#if !INI_USE_STACK
+    line = (char*)malloc(INI_MAX_LINE);
+    if (!line) {
+        return -2;
+    }
+#endif
+
+    /* Scan through stream line by line */
+    while (reader(line, INI_MAX_LINE, stream) != NULL) {
+        lineno++;
+
+        start = line;
+#if INI_ALLOW_BOM
+        if (lineno == 1 && (unsigned char)start[0] == 0xEF &&
+                           (unsigned char)start[1] == 0xBB &&
+                           (unsigned char)start[2] == 0xBF) {
+            start += 3;
+        }
+#endif
+        start = lskip(rstrip(start));
+
+        if (*start == ';' || *start == '#') {
+            /* Per Python configparser, allow both ; and # comments at the
+               start of a line */
+        }
+#if INI_ALLOW_MULTILINE
+        else if (*prev_name && *start && start > line) {
+            /* Non-blank line with leading whitespace, treat as continuation
+               of previous name's value (as per Python configparser). */
+            if (!handler(user, section, prev_name, start) && !error)
+                error = lineno;
+        }
+#endif
+        else if (*start == '[') {
+            /* A "[section]" line */
+            end = find_chars_or_comment(start + 1, "]");
+            if (*end == ']') {
+                *end = '\0';
+                strncpy0(section, start + 1, sizeof(section));
+                *prev_name = '\0';
+            }
+            else if (!error) {
+                /* No ']' found on section line */
+                error = lineno;
+            }
+        }
+        else if (*start) {
+            /* Not a comment, must be a name[=:]value pair */
+            end = find_chars_or_comment(start, "=:");
+            if (*end == '=' || *end == ':') {
+                *end = '\0';
+                name = rstrip(start);
+                value = lskip(end + 1);
+#if INI_ALLOW_INLINE_COMMENTS
+                end = find_chars_or_comment(value, NULL);
+                if (*end)
+                    *end = '\0';
+#endif
+                rstrip(value);
+
+                /* Valid name[=:]value pair found, call handler */
+                strncpy0(prev_name, name, sizeof(prev_name));
+                if (!handler(user, section, name, value) && !error)
+                    error = lineno;
+				memset(value, 0, strlen(value));
+            }
+            else if (!error) {
+                /* No '=' or ':' found on name[=:]value line */
+                error = lineno;
+            }
+        }
+
+#if INI_STOP_ON_FIRST_ERROR
+        if (error)
+            break;
+#endif
+    }
+
+#if !INI_USE_STACK
+    free(line);
+#endif
+
+    return error;
+}
+
+/* See documentation in header file. */
+int ini_parse_file(FILE* file, ini_handler handler, void* user)
+{
+    return ini_parse_stream((ini_reader)fgets, file, handler, user);
+}
+
+/* See documentation in header file. */
+int ini_parse(const char* filename, ini_handler handler, void* user)
+{
+    FILE* file;
+    int error;
+
+    file = fopen(filename, "r");
+    if (!file)
+        return -1;
+    error = ini_parse_file(file, handler, user);
+    fclose(file);
+    return error;
+}

examples/ini.h

@@ -0,0 +1,93 @@
+/* inih -- simple .INI file parser
+
+inih is released under the New BSD license (see LICENSE.txt). Go to the project
+home page for more info:
+
+https://github.com/benhoyt/inih
+
+*/
+
+#ifndef __INI_H__
+#define __INI_H__
+
+/* Make this header file easier to include in C++ code */
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdio.h>
+
+/* Typedef for prototype of handler function. */
+typedef int (*ini_handler)(void* user, const char* section,
+                           const char* name, const char* value);
+
+/* Typedef for prototype of fgets-style reader function. */
+typedef char* (*ini_reader)(char* str, int num, void* stream);
+
+/* Parse given INI-style file. May have [section]s, name=value pairs
+   (whitespace stripped), and comments starting with ';' (semicolon). Section
+   is "" if name=value pair parsed before any section heading. name:value
+   pairs are also supported as a concession to Python's configparser.
+
+   For each name=value pair parsed, call handler function with given user
+   pointer as well as section, name, and value (data only valid for duration
+   of handler call). Handler should return nonzero on success, zero on error.
+
+   Returns 0 on success, line number of first error on parse error (doesn't
+   stop on first error), -1 on file open error, or -2 on memory allocation
+   error (only when INI_USE_STACK is zero).
+*/
+int ini_parse(const char* filename, ini_handler handler, void* user);
+
+/* Same as ini_parse(), but takes a FILE* instead of filename. This doesn't
+   close the file when it's finished -- the caller must do that. */
+int ini_parse_file(FILE* file, ini_handler handler, void* user);
+
+/* Same as ini_parse(), but takes an ini_reader function pointer instead of
+   filename. Used for implementing custom or string-based I/O. */
+int ini_parse_stream(ini_reader reader, void* stream, ini_handler handler,
+                     void* user);
+
+/* Nonzero to allow multi-line value parsing, in the style of Python's
+   configparser. If allowed, ini_parse() will call the handler with the same
+   name for each subsequent line parsed. */
+#ifndef INI_ALLOW_MULTILINE
+#define INI_ALLOW_MULTILINE 1
+#endif
+
+/* Nonzero to allow a UTF-8 BOM sequence (0xEF 0xBB 0xBF) at the start of
+   the file. See http://code.google.com/p/inih/issues/detail?id=21 */
+#ifndef INI_ALLOW_BOM
+#define INI_ALLOW_BOM 1
+#endif
+
+/* Nonzero to allow inline comments (with valid inline comment characters
+   specified by INI_INLINE_COMMENT_PREFIXES). Set to 0 to turn off and match
+   Python 3.2+ configparser behaviour. */
+#ifndef INI_ALLOW_INLINE_COMMENTS
+#define INI_ALLOW_INLINE_COMMENTS 1
+#endif
+#ifndef INI_INLINE_COMMENT_PREFIXES
+#define INI_INLINE_COMMENT_PREFIXES ";"
+#endif
+
+/* Nonzero to use stack, zero to use heap (malloc/free). */
+#ifndef INI_USE_STACK
+#define INI_USE_STACK 1
+#endif
+
+/* Stop parsing on first error (default is to keep parsing). */
+#ifndef INI_STOP_ON_FIRST_ERROR
+#define INI_STOP_ON_FIRST_ERROR 0
+#endif
+
+/* Maximum line length for any line in INI file. */
+#ifndef INI_MAX_LINE
+#define INI_MAX_LINE 2000
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __INI_H__ */

examples/meson.build

@@ -1,5 +1,5 @@
 lib_shared = static_library('shared',
-  ['shared.c', 'cat.c'],
+  ['shared.c', 'cat.c', 'ini.c', 'config.c'],
   dependencies: wlroots)
 
 executable('simple', 'simple.c', dependencies: wlroots, link_with: lib_shared)

examples/output-layout.c

@@ -22,6 +22,7 @@
 #include <wlr/types/wlr_keyboard.h>
 #include <math.h>
 #include "shared.h"
+#include "config.h"
 #include "cat.h"
 
 struct sample_state {
@@ -49,8 +50,8 @@ static void handle_output_frame(struct output_state *output, struct timespec *ts
 		float matrix[16];
 
 		// transform global coordinates to local coordinates
-		int local_x = sample->x_offs;
+		double local_x = sample->x_offs;
-		int local_y = sample->y_offs;
+		double local_y = sample->y_offs;
 		wlr_output_layout_output_coords(sample->layout, output->output, &local_x,
 				&local_y);
 

examples/pointer.c

@@ -6,6 +6,7 @@
 #include <string.h>
 #include <unistd.h>
 #include <math.h>
+#include <assert.h>
 #include <wayland-server.h>
 #include <wayland-server-protocol.h>
 #include <xkbcommon/xkbcommon.h>
@@ -16,19 +17,71 @@
 #include <wlr/backend.h>
 #include <wlr/backend/session.h>
 #include <wlr/types/wlr_keyboard.h>
+#include <wlr/types/wlr_output_layout.h>
 #include <wlr/xcursor.h>
+#include <wlr/types/wlr_cursor.h>
 #include <wlr/util/log.h>
 #include "shared.h"
+#include "config.h"
 #include "cat.h"
 
+struct sample_input_device {
+	struct wlr_input_device *device;
+	struct wl_list link;
+};
+
 struct sample_state {
-	struct wlr_xcursor *cursor;
+	struct compositor_state *compositor;
+	struct example_config *config;
+	struct wlr_xcursor *xcursor;
+	struct wlr_cursor *cursor;
 	double cur_x, cur_y;
 	float default_color[4];
 	float clear_color[4];
+	struct wlr_output_layout *layout;
+	struct wl_list devices;
+
+	struct wl_listener cursor_motion;
+	struct wl_listener cursor_motion_absolute;
+	struct wl_listener cursor_button;
+	struct wl_listener cursor_axis;
+
+	struct wl_listener touch_motion;
+	struct wl_listener touch_up;
+	struct wl_listener touch_down;
+	struct wl_listener touch_cancel;
+	list_t *touch_points;
+
+	struct wl_listener tablet_tool_axis;
+	struct wl_listener tablet_tool_proxmity;
+	struct wl_listener tablet_tool_tip;
+	struct wl_listener tablet_tool_button;
 };
 
-static void handle_output_frame(struct output_state *output, struct timespec *ts) {
+struct touch_point {
+	int32_t slot;
+	double x, y;
+};
+
+static void warp_to_touch(struct sample_state *sample,
+        struct wlr_input_device *dev) {
+	if (sample->touch_points->length == 0) {
+		return;
+	}
+
+	double x = 0, y = 0;
+	for (size_t i = 0; i < sample->touch_points->length; ++i) {
+		struct touch_point *point = sample->touch_points->items[i];
+		x += point->x;
+		y += point->y;
+	}
+	x /= sample->touch_points->length;
+	y /= sample->touch_points->length;
+	wlr_cursor_warp_absolute(sample->cursor, dev, x, y);
+}
+
+static void handle_output_frame(struct output_state *output,
+        struct timespec *ts) {
 	struct compositor_state *state = output->compositor;
 	struct sample_state *sample = state->data;
 	struct wlr_output *wlr_output = output->output;
@@ -36,80 +89,64 @@ static void handle_output_frame(struct output_state *output, struct timespec *ts
 	wlr_output_make_current(wlr_output);
 
 	glClearColor(sample->clear_color[0], sample->clear_color[1],
-			sample->clear_color[2], sample->clear_color[3]);
+		sample->clear_color[2], sample->clear_color[3]);
 	glClear(GL_COLOR_BUFFER_BIT);
 
 	wlr_output_swap_buffers(wlr_output);
 }
 
-static void handle_pointer_motion(struct pointer_state *pstate,
+static void configure_devices(struct sample_state *sample) {
-		double d_x, double d_y) {
+	struct sample_input_device *dev;
-	struct sample_state *state = pstate->compositor->data;
+	struct device_config *dc;
-	state->cur_x += d_x;
-	state->cur_y += d_y;
 
-	struct wlr_xcursor_image *image = state->cursor->images[0];
+	// reset device mappings
-
+	wl_list_for_each(dev, &sample->devices, link) {
-	struct output_state *output;
+		wlr_cursor_map_input_to_output(sample->cursor, dev->device, NULL);
-	wl_list_for_each(output, &pstate->compositor->outputs, link) {
+		wl_list_for_each(dc, &sample->config->devices, link) {
-		wlr_output_move_cursor(output->output,
+			if (strcmp(dev->device->name, dc->name) == 0) {
-				state->cur_x - image->hotspot_x,
+				wlr_cursor_map_input_to_region(sample->cursor, dev->device,
-				state->cur_y - image->hotspot_y);
+					dc->mapped_box);
-	}
+			}
-}
+		}
-
+	}
-static void handle_pointer_motion_absolute(struct pointer_state *pstate,
+
-		double x, double y) {
+	struct output_state *ostate;
-	struct sample_state *state = pstate->compositor->data;
+	wl_list_for_each(ostate, &sample->compositor->outputs, link) {
-	state->cur_x = x;
+		wl_list_for_each(dc, &sample->config->devices, link) {
-	state->cur_y = y;
+			// configure device to output mappings
-
+			if (dc->mapped_output &&
-	struct wlr_xcursor_image *image = state->cursor->images[0];
+					strcmp(dc->mapped_output, ostate->output->name) == 0) {
-
+				wl_list_for_each(dev, &sample->devices, link) {
-	struct output_state *output;
+					if (strcmp(dev->device->name, dc->name) == 0) {
-	wl_list_for_each(output, &pstate->compositor->outputs, link) {
+						wlr_cursor_map_input_to_output(sample->cursor,
-		wlr_output_move_cursor(output->output,
+							dev->device, ostate->output);
-				state->cur_x - image->hotspot_x,
+					}
-				state->cur_y - image->hotspot_y);
+				}
-	}
+			}
-}
-
-static void handle_pointer_button(struct pointer_state *pstate,
-		uint32_t button, enum wlr_button_state state) {
-	struct sample_state *sample = pstate->compositor->data;
-	float (*color)[4];
-	if (state == WLR_BUTTON_RELEASED) {
-		color = &sample->default_color;
-	} else {
-		float red[4] = { 0.25f, 0.25f, 0.25f, 1 };
-		red[button % 3] = 1;
-		color = &red;
-	}
-	memcpy(&sample->clear_color, color, sizeof(*color));
-}
-
-static void handle_pointer_axis(struct pointer_state *pstate,
-	enum wlr_axis_source source,
-	enum wlr_axis_orientation orientation,
-	double delta) {
-	struct sample_state *sample = pstate->compositor->data;
-	for (size_t i = 0; i < 3; ++i) {
-		sample->default_color[i] += delta > 0 ? -0.05f : 0.05f;
-		if (sample->default_color[i] > 1.0f) {
-			sample->default_color[i] = 1.0f;
-		}
-		if (sample->default_color[i] < 0.0f) {
-			sample->default_color[i] = 0.0f;
 		}
 	}
-	memcpy(&sample->clear_color, &sample->default_color,
-			sizeof(sample->clear_color));
 }
 
 static void handle_output_add(struct output_state *ostate) {
-	struct sample_state *state = ostate->compositor->data;
+	struct sample_state *sample = ostate->compositor->data;
 	struct wlr_output *wlr_output = ostate->output;
-	struct wlr_xcursor_image *image = state->cursor->images[0];
+	struct wlr_xcursor_image *image = sample->xcursor->images[0];
+
+	// reset layout
+	wlr_output_layout_destroy(sample->layout);
+	sample->layout =
+        configure_layout(sample->config, &ostate->compositor->outputs);
+	wlr_cursor_attach_output_layout(sample->cursor, sample->layout);
+
+	// cursor configuration
+	char *mapped_output = sample->config->cursor.mapped_output;
+	if (mapped_output && strcmp(mapped_output, wlr_output->name) == 0) {
+		wlr_cursor_map_to_output(sample->cursor, wlr_output);
+	}
+
+	configure_devices(sample);
+
+	// TODO move to wlr_cursor
 	if (!wlr_output_set_cursor(wlr_output, image->buffer,
 			image->width, image->width, image->height)) {
 		wlr_log(L_DEBUG, "Failed to set hardware cursor");
@@ -120,34 +157,254 @@ static void handle_output_add(struct output_state *ostate) {
 	}
 }
 
+static void handle_output_remove(struct output_state *ostate) {
+		struct sample_state *sample = ostate->compositor->data;
+	wlr_output_layout_destroy(sample->layout);
+	sample->layout =
+        configure_layout(sample->config, &ostate->compositor->outputs);
+	wlr_cursor_attach_output_layout(sample->cursor, sample->layout);
+
+	configure_devices(sample);
+
+	char *mapped_output = sample->config->cursor.mapped_output;
+	if (mapped_output && strcmp(mapped_output, ostate->output->name) == 0) {
+		wlr_cursor_map_to_output(sample->cursor, NULL);
+	}
+}
+
+static void handle_output_resolution(struct compositor_state *state,
+		struct output_state *ostate) {
+	struct sample_state *sample = ostate->compositor->data;
+	wlr_output_layout_destroy(sample->layout);
+	sample->layout =
+        configure_layout(sample->config, &ostate->compositor->outputs);
+	wlr_cursor_attach_output_layout(sample->cursor, sample->layout);
+}
+
+static void handle_input_add(struct compositor_state *state,
+        struct wlr_input_device *device) {
+	struct sample_state *sample = state->data;
+
+	if (device->type == WLR_INPUT_DEVICE_POINTER ||
+			device->type == WLR_INPUT_DEVICE_TOUCH ||
+			device->type == WLR_INPUT_DEVICE_TABLET_TOOL) {
+		struct sample_input_device *s_device;
+		s_device = calloc(1, sizeof(struct sample_input_device));
+		s_device->device = device;
+
+		wl_list_insert(&sample->devices, &s_device->link);
+		wlr_cursor_attach_input_device(sample->cursor, device);
+		configure_devices(sample);
+	}
+}
+
+static void handle_input_remove(struct compositor_state *state,
+        struct wlr_input_device *device) {
+	struct sample_state *sample = state->data;
+	struct sample_input_device *s_device, *tmp = NULL;
+	wl_list_for_each_safe(s_device, tmp, &sample->devices, link) {
+		if (s_device->device == device) {
+			wl_list_remove(&s_device->link);
+			free(s_device);
+		}
+	}
+}
+
+static void handle_cursor_motion(struct wl_listener *listener, void *data) {
+	struct sample_state *sample =
+        wl_container_of(listener, sample, cursor_motion);
+	struct wlr_event_pointer_motion *event = data;
+	wlr_cursor_move(sample->cursor, event->device, event->delta_x,
+        event->delta_y);
+}
+
+static void handle_cursor_motion_absolute(struct wl_listener *listener,
+        void *data) {
+	struct sample_state *sample =
+        wl_container_of(listener, sample, cursor_motion_absolute);
+	struct wlr_event_pointer_motion_absolute *event = data;
+
+	sample->cur_x = event->x_mm;
+	sample->cur_y = event->y_mm;
+
+	struct wlr_xcursor_image *image = sample->xcursor->images[0];
+
+	struct output_state *output;
+	wl_list_for_each(output, &sample->compositor->outputs, link) {
+		wlr_output_move_cursor(output->output,
+				sample->cur_x - image->hotspot_x,
+				sample->cur_y - image->hotspot_y);
+	}
+}
+
+static void handle_cursor_button(struct wl_listener *listener, void *data) {
+	struct sample_state *sample =
+        wl_container_of(listener, sample, cursor_button);
+	struct wlr_event_pointer_button *event = data;
+
+	float (*color)[4];
+	if (event->state == WLR_BUTTON_RELEASED) {
+		color = &sample->default_color;
+		memcpy(&sample->clear_color, color, sizeof(*color));
+	} else {
+		float red[4] = { 0.25f, 0.25f, 0.25f, 1 };
+		red[event->button % 3] = 1;
+		color = &red;
+		memcpy(&sample->clear_color, color, sizeof(*color));
+	}
+}
+
+static void handle_cursor_axis(struct wl_listener *listener, void *data) {
+	struct sample_state *sample =
+        wl_container_of(listener, sample, cursor_axis);
+	struct wlr_event_pointer_axis *event = data;
+
+	for (size_t i = 0; i < 3; ++i) {
+		sample->default_color[i] += event->delta > 0 ? -0.05f : 0.05f;
+		if (sample->default_color[i] > 1.0f) {
+			sample->default_color[i] = 1.0f;
+		}
+		if (sample->default_color[i] < 0.0f) {
+			sample->default_color[i] = 0.0f;
+		}
+	}
+
+	memcpy(&sample->clear_color, &sample->default_color,
+			sizeof(sample->clear_color));
+}
+
+static void handle_touch_up(struct wl_listener *listener, void *data) {
+	struct sample_state *sample = wl_container_of(listener, sample, touch_up);
+	struct wlr_event_touch_up *event = data;
+	for (size_t i = 0; i < sample->touch_points->length; ++i) {
+		struct touch_point *point = sample->touch_points->items[i];
+		if (point->slot == event->slot) {
+			list_del(sample->touch_points, i);
+			break;
+		}
+	}
+
+	warp_to_touch(sample, event->device);
+}
+
+static void handle_touch_down(struct wl_listener *listener, void *data) {
+	struct sample_state *sample = wl_container_of(listener, sample, touch_down);
+	struct wlr_event_touch_down *event = data;
+	struct touch_point *point = calloc(1, sizeof(struct touch_point));
+	point->slot = event->slot;
+	point->x = event->x_mm / event->width_mm;
+	point->y = event->y_mm / event->height_mm;
+	if (list_add(sample->touch_points, point) == -1) {
+		free(point);
+	}
+
+	warp_to_touch(sample, event->device);
+}
+
+static void handle_touch_motion(struct wl_listener *listener, void *data) {
+	struct sample_state *sample =
+        wl_container_of(listener, sample, touch_motion);
+	struct wlr_event_touch_motion *event = data;
+	for (size_t i = 0; i < sample->touch_points->length; ++i) {
+		struct touch_point *point = sample->touch_points->items[i];
+		if (point->slot == event->slot) {
+			point->x = event->x_mm / event->width_mm;
+			point->y = event->y_mm / event->height_mm;
+			break;
+		}
+	}
+
+	warp_to_touch(sample, event->device);
+}
+
+static void handle_touch_cancel(struct wl_listener *listener, void *data) {
+	wlr_log(L_DEBUG, "TODO: touch cancel");
+}
+
+static void handle_tablet_tool_axis(struct wl_listener *listener, void *data) {
+	struct sample_state *sample =
+        wl_container_of(listener, sample, tablet_tool_axis);
+	struct wlr_event_tablet_tool_axis *event = data;
+	if ((event->updated_axes & WLR_TABLET_TOOL_AXIS_X) &&
+			(event->updated_axes & WLR_TABLET_TOOL_AXIS_Y)) {
+		wlr_cursor_warp_absolute(sample->cursor, event->device,
+			event->x_mm / event->width_mm, event->y_mm / event->height_mm);
+	}
+}
+
 int main(int argc, char *argv[]) {
 	struct sample_state state = {
 		.default_color = { 0.25f, 0.25f, 0.25f, 1 },
-		.clear_color = { 0.25f, 0.25f, 0.25f, 1 }
+		.clear_color = { 0.25f, 0.25f, 0.25f, 1 },
+		.touch_points = list_create(),
 	};
+
+	state.config = parse_args(argc, argv);
+	state.cursor = wlr_cursor_create();
+	wlr_cursor_map_to_region(state.cursor, state.config->cursor.mapped_box);
+	wl_list_init(&state.devices);
+
+	// pointer events
+	wl_signal_add(&state.cursor->events.motion, &state.cursor_motion);
+	state.cursor_motion.notify = handle_cursor_motion;
+
+	wl_signal_add(&state.cursor->events.motion_absolute,
+        &state.cursor_motion_absolute);
+	state.cursor_motion_absolute.notify = handle_cursor_motion_absolute;
+
+	wl_signal_add(&state.cursor->events.button, &state.cursor_button);
+	state.cursor_button.notify = handle_cursor_button;
+
+	wl_signal_add(&state.cursor->events.axis, &state.cursor_axis);
+	state.cursor_axis.notify = handle_cursor_axis;
+
+	// touch events
+	wl_signal_add(&state.cursor->events.touch_up, &state.touch_up);
+	state.touch_up.notify = handle_touch_up;
+
+	wl_signal_add(&state.cursor->events.touch_down, &state.touch_down);
+	state.touch_down.notify = handle_touch_down;
+
+	wl_signal_add(&state.cursor->events.touch_motion, &state.touch_motion);
+	state.touch_motion.notify = handle_touch_motion;
+
+	wl_signal_add(&state.cursor->events.touch_cancel, &state.touch_cancel);
+	state.touch_cancel.notify = handle_touch_cancel;
+
+	// tool events
+	wl_signal_add(&state.cursor->events.tablet_tool_axis,
+        &state.tablet_tool_axis);
+	state.tablet_tool_axis.notify = handle_tablet_tool_axis;
+
 	struct compositor_state compositor = { 0 };
 	compositor.data = &state;
 	compositor.output_add_cb = handle_output_add;
+	compositor.output_remove_cb = handle_output_remove;
+	compositor.output_resolution_cb = handle_output_resolution;
 	compositor.output_frame_cb = handle_output_frame;
-	compositor.pointer_motion_cb = handle_pointer_motion;
+	compositor.input_add_cb = handle_input_add;
-	compositor.pointer_motion_absolute_cb = handle_pointer_motion_absolute;
+	compositor.input_remove_cb = handle_input_remove;
-	compositor.pointer_button_cb = handle_pointer_button;
+
-	compositor.pointer_axis_cb = handle_pointer_axis;
+	state.compositor = &compositor;
 
 	struct wlr_xcursor_theme *theme = wlr_xcursor_theme_load("default", 16);
 	if (!theme) {
 		wlr_log(L_ERROR, "Failed to load cursor theme");
 		return 1;
 	}
-	state.cursor = wlr_xcursor_theme_get_cursor(theme, "left_ptr");
+	state.xcursor = wlr_xcursor_theme_get_cursor(theme, "left_ptr");
-	if (!state.cursor) {
+	if (!state.xcursor) {
 		wlr_log(L_ERROR, "Failed to load left_ptr cursor");
 		return 1;
 	}
 
+	wlr_cursor_set_xcursor(state.cursor, state.xcursor);
+
 	compositor_init(&compositor);
 	wl_display_run(compositor.display);
 	compositor_fini(&compositor);
 
 	wlr_xcursor_theme_destroy(theme);
+	example_config_destroy(state.config);
+	wlr_cursor_destroy(state.cursor);
 }

examples/rotation.c

@@ -19,6 +19,7 @@
 #include <wlr/util/log.h>
 #include <math.h>
 #include "shared.h"
+#include "config.h"
 #include "cat.h"
 
 struct sample_state {

examples/shared.c

@@ -18,145 +18,6 @@
 #include <wlr/util/log.h>
 #include "shared.h"
 
-static void usage(const char *name, int ret) {
-	fprintf(stderr,
-		"usage: %s [-d <name> [-r <rotation> | -f]]*\n"
-		"\n"
-		" -o <output>    The name of the DRM display. e.g. DVI-I-1.\n"
-		" -r <rotation>  The rotation counter clockwise. Valid values are 90, 180, 270.\n"
-		" -x <position>  The X-axis coordinate position of this output in the layout.\n"
-		" -y <position>  The Y-axis coordinate position of this output in the layout.\n"
-		" -f             Flip the output along the vertical axis.\n", name);
-
-	exit(ret);
-}
-
-struct example_config *parse_args(int argc, char *argv[]) {
-	struct example_config *config = calloc(1, sizeof(struct example_config));
-	wl_list_init(&config->outputs);
-	struct output_config *oc = NULL;
-
-	int c;
-	while ((c = getopt(argc, argv, "o:r:x:y:fh")) != -1) {
-		switch (c) {
-		case 'o':
-			oc = calloc(1, sizeof(*oc));
-			oc->name = optarg;
-			oc->transform = WL_OUTPUT_TRANSFORM_NORMAL;
-			wl_list_insert(&config->outputs, &oc->link);
-			break;
-		case 'r':
-			if (!oc) {
-				fprintf(stderr, "You must specify an output first\n");
-				usage(argv[0], 1);
-			}
-
-			if (oc->transform != WL_OUTPUT_TRANSFORM_NORMAL
-					&& oc->transform != WL_OUTPUT_TRANSFORM_FLIPPED) {
-				fprintf(stderr, "Rotation for %s already specified\n", oc->name);
-				usage(argv[0], 1);
-			}
-
-			if (strcmp(optarg, "90") == 0) {
-				oc->transform += WL_OUTPUT_TRANSFORM_90;
-			} else if (strcmp(optarg, "180") == 0) {
-				oc->transform += WL_OUTPUT_TRANSFORM_180;
-			} else if (strcmp(optarg, "270") == 0) {
-				oc->transform += WL_OUTPUT_TRANSFORM_270;
-			} else {
-				fprintf(stderr, "Invalid rotation '%s'\n", optarg);
-				usage(argv[0], 1);
-			}
-			break;
-		case 'x':
-			if (!oc) {
-				fprintf(stderr, "You must specify an output first\n");
-				usage(argv[0], 1);
-			}
-			oc->x = strtol(optarg, NULL, 0);
-			break;
-		case 'y':
-			if (!oc) {
-				fprintf(stderr, "You must specify an output first\n");
-				usage(argv[0], 1);
-			}
-			oc->y = strtol(optarg, NULL, 0);
-			break;
-		case 'f':
-			if (!oc) {
-				fprintf(stderr, "You must specify an output first\n");
-				usage(argv[0], 1);
-			}
-
-			if (oc->transform >= WL_OUTPUT_TRANSFORM_FLIPPED) {
-				fprintf(stderr, "Flip for %s already specified\n", oc->name);
-				usage(argv[0], 1);
-			}
-
-			oc->transform += WL_OUTPUT_TRANSFORM_FLIPPED;
-			break;
-		case 'h':
-		case '?':
-			usage(argv[0], c != 'h');
-		}
-	}
-
-	return config;
-}
-
-void example_config_destroy(struct example_config *config) {
-	struct output_config *oc, *tmp = NULL;
-	wl_list_for_each_safe(oc, tmp, &config->outputs, link) {
-		free(oc);
-	}
-	free(config);
-}
-
-struct wlr_output_layout *configure_layout(struct example_config *config, struct wl_list *outputs) {
-	struct wlr_output_layout *layout = wlr_output_layout_init();
-	int max_x = INT_MIN;
-	int max_x_y = INT_MIN; // y value for the max_x output
-
-	// first add all the configured outputs
-	struct output_state *output;
-	wl_list_for_each(output, outputs, link) {
-		struct output_config *conf;
-		wl_list_for_each(conf, &config->outputs, link) {
-			if (strcmp(conf->name, output->output->name) == 0) {
-				wlr_output_layout_add(layout, output->output,
-						conf->x, conf->y);
-				wlr_output_transform(output->output, conf->transform);
-				int width, height;
-				wlr_output_effective_resolution(output->output, &width, &height);
-				if (conf->x + width > max_x) {
-					max_x = conf->x + width;
-					max_x_y = conf->y;
-				}
-				break;
-			}
-		}
-	}
-
-	if (max_x == INT_MIN) {
-		// couldn't find a configured output
-		max_x = 0;
-		max_x_y = 0;
-	}
-
-	// now add all the other configured outputs in a sensible position
-	wl_list_for_each(output, outputs, link) {
-		if (wlr_output_layout_get(layout, output->output)) {
-			continue;
-		}
-		wlr_output_layout_add(layout, output->output, max_x, max_x_y);
-		int width, height;
-		wlr_output_effective_resolution(output->output, &width, &height);
-		max_x += width;
-	}
-
-	return layout;
-}
-
 
 static void keyboard_led_update(struct keyboard_state *kbstate) {
 	uint32_t leds = 0;
@@ -441,6 +302,10 @@ static void input_add_notify(struct wl_listener *listener, void *data) {
 	default:
 		break;
 	}
+
+	if (state->input_add_cb) {
+		state->input_add_cb(state, device);
+	}
 }
 
 static void keyboard_remove(struct wlr_input_device *device, struct compositor_state *state) {
@@ -536,6 +401,11 @@ static void tablet_pad_remove(struct wlr_input_device *device, struct compositor
 static void input_remove_notify(struct wl_listener *listener, void *data) {
 	struct wlr_input_device *device = data;
 	struct compositor_state *state = wl_container_of(listener, state, input_remove);
+
+	if (state->input_remove_cb) {
+		state->input_remove_cb(state, device);
+	}
+
 	switch (device->type) {
 	case WLR_INPUT_DEVICE_KEYBOARD:
 		keyboard_remove(device, state);

examples/shared.h

@@ -12,24 +12,6 @@
 #include <wlr/types/wlr_output.h>
 #include <wlr/types/wlr_input_device.h>
 
-struct output_config {
-	char *name;
-	enum wl_output_transform transform;
-	int x, y;
-	struct wl_list link;
-};
-
-struct example_config {
-	struct wl_list outputs;
-};
-
-struct example_config *parse_args(int argc, char *argv[]);
-
-void example_config_destroy(struct example_config *config);
-
-struct wlr_output_layout *configure_layout(struct example_config *config,
-		struct wl_list *outputs);
-
 struct output_state {
 	struct compositor_state *compositor;
 	struct wlr_output *output;
@@ -93,6 +75,10 @@ struct tablet_pad_state {
 };
 
 struct compositor_state {
+	void (*input_add_cb)(struct compositor_state *compositor,
+			struct wlr_input_device *device);
+	void (*input_remove_cb)(struct compositor_state *compositor,
+			struct wlr_input_device *device);
 	void (*output_add_cb)(struct output_state *s);
 	void (*keyboard_add_cb)(struct keyboard_state *s);
 	void (*output_frame_cb)(struct output_state *s, struct timespec *ts);

examples/touch.c

@@ -61,7 +61,7 @@ static void handle_output_frame(struct output_state *output, struct timespec *ts
 static void handle_touch_down(struct touch_state *tstate, int32_t slot,
 		double x, double y, double width, double height) {
 	struct sample_state *sample = tstate->compositor->data;
-	struct touch_point *point = calloc(1, sizeof(struct touch_state));
+	struct touch_point *point = calloc(1, sizeof(struct touch_point));
 	point->slot = slot;
 	point->x = x / width;
 	point->y = y / height;

examples/wlr-example.ini.example

@@ -0,0 +1,57 @@
+# Configuration
+# -------------
+# Some examples will read a configuration file. Not all examples will use all of
+# the configuration options. The configuration file will be loaded from
+# `wlr-example.ini` from the current directory or the path can be specified by the
+# `-C` option given on the command line.
+#
+# Output configuration
+# ~~~~~~~~~~~~~~~~~~~~
+# Each output is specified in a section named [output:{NAME}] where NAME is the
+# drm name for this output.
+#
+# Value "x" specifies the x-coordinate in the output layout.
+#
+# Value "y" specifies the y-coordinate in the output layout.
+#
+# Value "rotate" specifies output rotation and can be 90, 180, 270, flipped,
+# flipped-90, flipped-180, or flipped-270
+[output:HDMI-A-1]
+x=3000
+y=0
+rotate=90
+
+[output:DP-1]
+x=0
+y=0
+rotate=270
+
+[output:DVI-D-1]
+x=1080
+y=232
+
+# Cursor Configuration
+# ~~~~~~~~~~~~~~~~~~~~
+# Value "map-to-output" specifies the output to which the cursor is
+# constrained.
+#
+# Value "geometry" specifies the geometry (widthxheight+x+y) to which the cursor
+# is constrained.
+[cursor]
+map-to-output=HDMI-A-1
+geometry=500x700+50+50
+
+# Device Configuration
+# ~~~~~~~~~~~~~~~~~~~~
+# Each device is specified in a section named [device:{NAME}] where NAME is the
+# name given to this device. See a log file for device names.
+#
+# Value "map-to-output" specifies the output to which the device is constrained.
+#
+# Value "geometry" specifies the geometry (widthxheight+x+y) to which the device
+# is constrained.
+[device:Razer Razer DeathAdder 2013]
+map-to-output=DP-1
+geometry=500x700+50+50
+
+# vim:filetype=dosini

include/wlr/types/wlr_box.h

@@ -0,0 +1,20 @@
+#ifndef _WLR_TYPES_GEOMETRY_H
+#define _WLR_TYPES_GEOMETRY_H
+#include <stdbool.h>
+
+struct wlr_box {
+	int x, y;
+	int width, height;
+};
+
+void wlr_box_closest_point(struct wlr_box *box, double x, double y,
+		double *dest_x, double *dest_y);
+
+bool wlr_box_intersection(struct wlr_box *box_a,
+		struct wlr_box *box_b, struct wlr_box **dest);
+
+bool wlr_box_contains_point(struct wlr_box *box, double x, double y);
+
+bool wlr_box_empty(struct wlr_box *box);
+
+#endif

include/wlr/types/wlr_cursor.h

@@ -0,0 +1,112 @@
+#ifndef _WLR_TYPES_CURSOR_H
+#define _WLR_TYPES_CURSOR_H
+#include <wayland-server.h>
+#include <wlr/types/wlr_output.h>
+#include <wlr/types/wlr_output_layout.h>
+#include <wlr/types/wlr_input_device.h>
+#include <wlr/types/wlr_box.h>
+#include <wlr/xcursor.h>
+
+struct wlr_cursor_state;
+
+struct wlr_cursor {
+	struct wlr_cursor_state *state;
+	int x, y;
+
+	struct {
+		struct wl_signal motion;
+		struct wl_signal motion_absolute;
+		struct wl_signal button;
+		struct wl_signal axis;
+
+		struct wl_signal touch_up;
+		struct wl_signal touch_down;
+		struct wl_signal touch_motion;
+		struct wl_signal touch_cancel;
+
+		struct wl_signal tablet_tool_axis;
+		struct wl_signal tablet_tool_proximity;
+		struct wl_signal tablet_tool_tip;
+		struct wl_signal tablet_tool_button;
+	} events;
+};
+
+struct wlr_cursor *wlr_cursor_create();
+
+void wlr_cursor_destroy(struct wlr_cursor *cur);
+
+void wlr_cursor_set_xcursor(struct wlr_cursor *cur, struct wlr_xcursor *xcur);
+
+/**
+ * Warp the cursor to the given x and y in layout coordinates. If x and y are
+ * out of the layout boundaries or constraints, no warp will happen.
+ *
+ * `dev` may be passed to respect device mapping constraints. If `dev` is NULL,
+ * device mapping constraints will be ignored.
+ *
+ * Returns true when the mouse warp was successful.
+ */
+bool wlr_cursor_warp(struct wlr_cursor *cur, struct wlr_input_device *dev,
+		double x, double y);
+
+void wlr_cursor_warp_absolute(struct wlr_cursor *cur,
+		struct wlr_input_device *dev, double x_mm, double y_mm);
+
+/**
+ * Move the cursor in the direction of the given x and y coordinates.
+ *
+ * `dev` may be passed to respect device mapping constraints. If `dev` is NULL,
+ * device mapping constraints will be ignored.
+ */
+void wlr_cursor_move(struct wlr_cursor *cur, struct wlr_input_device *dev,
+		double delta_x, double delta_y);
+
+/**
+ * Attaches this input device to this cursor. The input device must be one of:
+ *
+ * - WLR_INPUT_DEVICE_POINTER
+ * - WLR_INPUT_DEVICE_TOUCH
+ * - WLR_INPUT_DEVICE_TABLET_TOOL
+ */
+void wlr_cursor_attach_input_device(struct wlr_cursor *cur,
+		struct wlr_input_device *dev);
+
+void wlr_cursor_detach_input_device(struct wlr_cursor *cur,
+		struct wlr_input_device *dev);
+/**
+ * Uses the given layout to establish the boundaries and movement semantics of
+ * this cursor. Cursors without an output layout allow infinite movement in any
+ * direction and do not support absolute input events.
+ */
+void wlr_cursor_attach_output_layout(struct wlr_cursor *cur,
+		struct wlr_output_layout *l);
+
+/**
+ * Attaches this cursor to the given output, which must be among the outputs in
+ * the current output_layout for this cursor. This call is invalid for a cursor
+ * without an associated output layout.
+ */
+void wlr_cursor_map_to_output(struct wlr_cursor *cur,
+		struct wlr_output *output);
+
+/**
+ * Maps all input from a specific input device to a given output. The input
+ * device must be attached to this cursor and the output must be among the
+ * outputs in the attached output layout.
+ */
+void wlr_cursor_map_input_to_output(struct wlr_cursor *cur,
+		struct wlr_input_device *dev, struct wlr_output *output);
+
+/**
+ * Maps this cursor to an arbitrary region on the associated wlr_output_layout.
+ */
+void wlr_cursor_map_to_region(struct wlr_cursor *cur, struct wlr_box *box);
+
+/**
+ * Maps inputs from this input device to an arbitrary region on the associated
+ * wlr_output_layout.
+ */
+void wlr_cursor_map_input_to_region(struct wlr_cursor *cur,
+		struct wlr_input_device *dev, struct wlr_box *box);
+
+#endif

include/wlr/types/wlr_input_device.h

@@ -40,6 +40,10 @@ struct wlr_input_device {
 		struct wlr_tablet_pad *tablet_pad;
 	};
 
+	struct {
+		struct wl_signal destroy;
+	} events;
+
 	void *data;
 };
 

include/wlr/types/wlr_output_layout.h

@@ -4,14 +4,20 @@
 #include <wayland-util.h>
 #include <stdbool.h>
 
+struct wlr_output_layout_state;
+
 struct wlr_output_layout {
-    struct wl_list outputs;
+	struct wl_list outputs;
+	struct wlr_output_layout_state *state;
 };
 
+struct wlr_output_layout_output_state;
+
 struct wlr_output_layout_output {
-    struct wlr_output *output;
+	struct wlr_output *output;
-    int x, y;
+	int x, y;
-    struct wl_list link;
+	struct wl_list link;
+	struct wlr_output_layout_output_state *state;
 };
 
 struct wlr_output_layout *wlr_output_layout_init();
@@ -38,7 +44,7 @@ void wlr_output_layout_remove(struct wlr_output_layout *layout,
  * coordinates relative to the given reference output.
  */
 void wlr_output_layout_output_coords(struct wlr_output_layout *layout,
-		struct wlr_output *reference, int *x, int *y);
+		struct wlr_output *reference, double *x, double *y);
 
 bool wlr_output_layout_contains_point(struct wlr_output_layout *layout,
 		struct wlr_output *reference, int x, int y);
@@ -46,4 +52,19 @@ bool wlr_output_layout_contains_point(struct wlr_output_layout *layout,
 bool wlr_output_layout_intersects(struct wlr_output_layout *layout,
 		struct wlr_output *reference, int x1, int y1, int x2, int y2);
 
+/**
+ * Get the closest point on this layout from the given point from the reference
+ * output. If reference is NULL, gets the closest point from the entire layout.
+ */
+void wlr_output_layout_closest_point(struct wlr_output_layout *layout,
+		struct wlr_output *reference, double x, double y, double *dest_x,
+		double *dest_y);
+
+/**
+ * Get the box of the layout for the given reference output. If `reference`
+ * is NULL, the box will be for the extents of the entire layout.
+ */
+struct wlr_box *wlr_output_layout_get_box(
+		struct wlr_output_layout *layout, struct wlr_output *reference);
+
 #endif

include/wlr/types/wlr_pointer.h

@@ -20,12 +20,14 @@ struct wlr_pointer {
 };
 
 struct wlr_event_pointer_motion {
+	struct wlr_input_device *device;
 	uint32_t time_sec;
 	uint64_t time_usec;
 	double delta_x, delta_y;
 };
 
 struct wlr_event_pointer_motion_absolute {
+	struct wlr_input_device *device;
 	uint32_t time_sec;
 	uint64_t time_usec;
 	double x_mm, y_mm;
@@ -33,6 +35,7 @@ struct wlr_event_pointer_motion_absolute {
 };
 
 struct wlr_event_pointer_button {
+	struct wlr_input_device *device;
 	uint32_t time_sec;
 	uint64_t time_usec;
 	uint32_t button;
@@ -52,6 +55,7 @@ enum wlr_axis_orientation {
 };
 
 struct wlr_event_pointer_axis {
+	struct wlr_input_device *device;
 	uint32_t time_sec;
 	uint64_t time_usec;
 	enum wlr_axis_source source;

include/wlr/types/wlr_tablet_tool.h

@@ -32,6 +32,7 @@ enum wlr_tablet_tool_axes {
 };
 
 struct wlr_event_tablet_tool_axis {
+	struct wlr_input_device *device;
 	uint32_t time_sec;
 	uint64_t time_usec;
 	uint32_t updated_axes;
@@ -51,9 +52,10 @@ enum wlr_tablet_tool_proximity_state {
 };
 
 struct wlr_event_tablet_tool_proximity {
+	struct wlr_input_device *device;
 	uint32_t time_sec;
 	uint64_t time_usec;
-	double x, y;
+	double x_mm, y_mm;
 	double width_mm, height_mm;
 	enum wlr_tablet_tool_proximity_state state;
 };
@@ -64,14 +66,16 @@ enum wlr_tablet_tool_tip_state {
 };
 
 struct wlr_event_tablet_tool_tip {
+	struct wlr_input_device *device;
 	uint32_t time_sec;
 	uint64_t time_usec;
-	double x, y;
+	double x_mm, y_mm;
 	double width_mm, height_mm;
 	enum wlr_tablet_tool_tip_state state;
 };
 
 struct wlr_event_tablet_tool_button {
+	struct wlr_input_device *device;
 	uint32_t time_sec;
 	uint64_t time_usec;
 	uint32_t button;

include/wlr/types/wlr_touch.h

@@ -19,6 +19,7 @@ struct wlr_touch {
 };
 
 struct wlr_event_touch_down {
+	struct wlr_input_device *device;
 	uint32_t time_sec;
 	uint64_t time_usec;
 	int32_t slot;
@@ -27,12 +28,14 @@ struct wlr_event_touch_down {
 };
 
 struct wlr_event_touch_up {
+	struct wlr_input_device *device;
 	uint32_t time_sec;
 	uint64_t time_usec;
 	int32_t slot;
 };
 
 struct wlr_event_touch_motion {
+	struct wlr_input_device *device;
 	uint32_t time_sec;
 	uint64_t time_usec;
 	int32_t slot;
@@ -41,6 +44,7 @@ struct wlr_event_touch_motion {
 };
 
 struct wlr_event_touch_cancel {
+	struct wlr_input_device *device;
 	uint32_t time_sec;
 	uint64_t time_usec;
 	int32_t slot;

types/meson.build

@@ -6,6 +6,7 @@ lib_wlr_types = static_library('wlr_types', files(
     'wlr_output.c',
     'wlr_output_layout.c',
     'wlr_pointer.c',
+    'wlr_cursor.c',
     'wlr_region.c',
     'wlr_seat.c',
     'wlr_surface.c',
@@ -15,6 +16,7 @@ lib_wlr_types = static_library('wlr_types', files(
     'wlr_xdg_shell_v6.c',
     'wlr_wl_shell.c',
     'wlr_compositor.c',
+    'wlr_box.c',
   ),
   include_directories: wlr_inc,
   dependencies: [wayland_server, pixman, wlr_protos])

types/wlr_box.c

@@ -0,0 +1,67 @@
+#include <limits.h>
+#include <stdlib.h>
+#include <math.h>
+#include <stdbool.h>
+#include <wlr/types/wlr_box.h>
+#include <wlr/util/log.h>
+
+void wlr_box_closest_point(struct wlr_box *box, double x, double y,
+		double *dest_x, double *dest_y) {
+	// find the closest x point
+	if (x < box->x) {
+		*dest_x = box->x;
+	} else if (x > box->x + box->width) {
+		*dest_x = box->x + box->width;
+	} else {
+		*dest_x = x;
+	}
+
+	// find closest y point
+	if (y < box->y) {
+		*dest_y = box->y;
+	} else if (y > box->y + box->height) {
+		*dest_y = box->y + box->height;
+	} else {
+		*dest_y = y;
+	}
+}
+
+bool wlr_box_empty(struct wlr_box *box) {
+	return box == NULL || box->width <= 0 || box->height <= 0;
+}
+
+bool wlr_box_intersection(struct wlr_box *box_a,
+		struct wlr_box *box_b, struct wlr_box **box_dest) {
+	struct wlr_box *dest = *box_dest;
+	bool a_empty = wlr_box_empty(box_a);
+	bool b_empty = wlr_box_empty(box_b);
+
+	if (a_empty || b_empty) {
+		dest->x = 0;
+		dest->y = 0;
+		dest->width = -100;
+		dest->height = -100;
+		return false;
+	}
+
+	int x1 = fmax(box_a->x, box_b->x);
+	int y1 = fmax(box_a->y, box_b->y);
+	int x2 = fmin(box_a->x + box_a->width, box_b->x + box_b->width);
+	int y2 = fmin(box_a->y + box_a->height, box_b->y + box_b->height);
+
+	dest->x = x1;
+	dest->y = y1;
+	dest->width = x2 - x1;
+	dest->height = y2 - y1;
+
+	return !wlr_box_empty(dest);
+}
+
+bool wlr_box_contains_point(struct wlr_box *box, double x, double y) {
+	if (wlr_box_empty(box)) {
+		return false;
+	} else {
+		return x >= box->x && x <= box->x + box->width &&
+			y >= box->y && y <= box->y + box->height;
+	}
+}

types/wlr_cursor.c

@@ -0,0 +1,481 @@
+#include <wlr/types/wlr_cursor.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <limits.h>
+#include <wlr/util/log.h>
+#include <wayland-server.h>
+#include <wlr/types/wlr_output.h>
+#include <wlr/types/wlr_output_layout.h>
+#include <wlr/types/wlr_input_device.h>
+
+struct wlr_cursor_device {
+	struct wlr_cursor *cursor;
+	struct wlr_input_device *device;
+	struct wl_list link;
+	struct wlr_output *mapped_output;
+	struct wlr_box *mapped_box;
+
+	struct wl_listener motion;
+	struct wl_listener motion_absolute;
+	struct wl_listener button;
+	struct wl_listener axis;
+
+	struct wl_listener touch_down;
+	struct wl_listener touch_up;
+	struct wl_listener touch_motion;
+	struct wl_listener touch_cancel;
+
+	struct wl_listener tablet_tool_axis;
+	struct wl_listener tablet_tool_proximity;
+	struct wl_listener tablet_tool_tip;
+	struct wl_listener tablet_tool_button;
+
+	struct wl_listener destroy;
+};
+
+struct wlr_cursor_state {
+	struct wl_list devices;
+	struct wlr_output_layout *layout;
+	struct wlr_xcursor *xcursor;
+	struct wlr_output *mapped_output;
+	struct wlr_box *mapped_box;
+};
+
+struct wlr_cursor *wlr_cursor_create() {
+	struct wlr_cursor *cur = calloc(1, sizeof(struct wlr_cursor));
+	if (!cur) {
+		wlr_log(L_ERROR, "Failed to allocate wlr_cursor");
+		return NULL;
+	}
+
+	cur->state = calloc(1, sizeof(struct wlr_cursor_state));
+	if (!cur->state) {
+		wlr_log(L_ERROR, "Failed to allocate wlr_cursor_state");
+		free(cur);
+		return NULL;
+	}
+
+	cur->state->mapped_output = NULL;
+
+	wl_list_init(&cur->state->devices);
+
+	// pointer signals
+	wl_signal_init(&cur->events.motion);
+	wl_signal_init(&cur->events.motion_absolute);
+	wl_signal_init(&cur->events.button);
+	wl_signal_init(&cur->events.axis);
+
+	// touch signals
+	wl_signal_init(&cur->events.touch_up);
+	wl_signal_init(&cur->events.touch_down);
+	wl_signal_init(&cur->events.touch_motion);
+	wl_signal_init(&cur->events.touch_cancel);
+
+	// tablet tool signals
+	wl_signal_init(&cur->events.tablet_tool_tip);
+	wl_signal_init(&cur->events.tablet_tool_axis);
+	wl_signal_init(&cur->events.tablet_tool_button);
+	wl_signal_init(&cur->events.tablet_tool_proximity);
+
+	cur->x = 100;
+	cur->y = 100;
+
+	return cur;
+}
+
+void wlr_cursor_destroy(struct wlr_cursor *cur) {
+	struct wlr_cursor_device *device, *device_tmp = NULL;
+	wl_list_for_each_safe(device, device_tmp, &cur->state->devices, link) {
+		wl_list_remove(&device->link);
+		free(device);
+	}
+
+	free(cur);
+}
+
+void wlr_cursor_set_xcursor(struct wlr_cursor *cur, struct wlr_xcursor *xcur) {
+	cur->state->xcursor = xcur;
+}
+
+static struct wlr_cursor_device *get_cursor_device(struct wlr_cursor *cur,
+		struct wlr_input_device *device) {
+	struct wlr_cursor_device *c_device, *ret = NULL;
+	wl_list_for_each(c_device, &cur->state->devices, link) {
+		if (c_device->device == device) {
+			ret = c_device;
+			break;
+		}
+	}
+
+	return ret;
+}
+
+static void wlr_cursor_warp_unchecked(struct wlr_cursor *cur,
+		double x, double y) {
+	assert(cur->state->layout);
+	int hotspot_x = 0;
+	int hotspot_y = 0;
+
+	if (cur->state->xcursor && cur->state->xcursor->image_count > 0) {
+		struct wlr_xcursor_image *image = cur->state->xcursor->images[0];
+		hotspot_x = image->hotspot_x;
+		hotspot_y = image->hotspot_y;
+	}
+
+
+	struct wlr_output_layout_output *l_output;
+	wl_list_for_each(l_output, &cur->state->layout->outputs, link) {
+		double output_x = x;
+		double output_y = y;
+
+		wlr_output_layout_output_coords(cur->state->layout,
+			l_output->output, &output_x, &output_y);
+		wlr_output_move_cursor(l_output->output, output_x - hotspot_x,
+			output_y - hotspot_y);
+	}
+
+	cur->x = x;
+	cur->y = y;
+}
+
+/**
+ * Get the most specific mapping box for the device in this order:
+ *
+ * 1. device geometry mapping
+ * 2. device output mapping
+ * 3. cursor geometry mapping
+ * 4. cursor output mapping
+ *
+ * Absolute movement for touch and pen devices will be relative to this box and
+ * pointer movement will be constrained to this box.
+ *
+ * If none of these are set, returns NULL and absolute movement should be
+ * relative to the extents of the layout.
+ */
+static struct wlr_box *get_mapping(struct wlr_cursor *cur,
+		struct wlr_input_device *dev) {
+	assert(cur->state->layout);
+	struct wlr_cursor_device *c_device = get_cursor_device(cur, dev);
+
+	if (c_device) {
+		if (c_device->mapped_box) {
+			return c_device->mapped_box;
+		}
+		if (c_device->mapped_output) {
+			return wlr_output_layout_get_box(cur->state->layout,
+				c_device->mapped_output);
+		}
+	}
+
+	if (cur->state->mapped_box) {
+		return cur->state->mapped_box;
+	}
+	if (cur->state->mapped_output) {
+		return wlr_output_layout_get_box(cur->state->layout,
+			cur->state->mapped_output);
+	}
+
+	return NULL;
+}
+
+bool wlr_cursor_warp(struct wlr_cursor *cur, struct wlr_input_device *dev,
+		double x, double y) {
+	assert(cur->state->layout);
+	bool result = false;
+
+	struct wlr_box *mapping = get_mapping(cur, dev);
+
+	if (mapping) {
+		if (wlr_box_contains_point(mapping, x, y)) {
+			wlr_cursor_warp_unchecked(cur, x, y);
+			result = true;
+		}
+	} else if (wlr_output_layout_contains_point(cur->state->layout, NULL,
+				x, y)) {
+		wlr_cursor_warp_unchecked(cur, x, y);
+		result = true;
+	}
+
+	return result;
+}
+
+void wlr_cursor_warp_absolute(struct wlr_cursor *cur,
+		struct wlr_input_device *dev, double x_mm, double y_mm) {
+	assert(cur->state->layout);
+
+	struct wlr_box *mapping = get_mapping(cur, dev);
+	if (!mapping) {
+		mapping = wlr_output_layout_get_box(cur->state->layout, NULL);
+	}
+
+	double x = mapping->width * x_mm + mapping->x;
+	double y = mapping->height * y_mm + mapping->y;
+
+	wlr_cursor_warp_unchecked(cur, x, y);
+}
+
+void wlr_cursor_move(struct wlr_cursor *cur, struct wlr_input_device *dev,
+		double delta_x, double delta_y) {
+	assert(cur->state->layout);
+
+	double x = cur->x + delta_x;
+	double y = cur->y + delta_y;
+
+	struct wlr_box *mapping = get_mapping(cur, dev);
+
+	if (mapping) {
+		double closest_x, closest_y;
+		if (!wlr_box_contains_point(mapping, x, y)) {
+			wlr_box_closest_point(mapping, x, y, &closest_x,
+				&closest_y);
+			x = closest_x;
+			y = closest_y;
+		}
+	} else {
+		if (!wlr_output_layout_contains_point(cur->state->layout, NULL, x, y)) {
+			double layout_x, layout_y;
+			wlr_output_layout_closest_point(cur->state->layout, NULL, x, y,
+				&layout_x, &layout_y);
+			x = layout_x;
+			y = layout_y;
+		}
+	}
+
+	wlr_cursor_warp_unchecked(cur, x, y);
+}
+
+static void handle_pointer_motion(struct wl_listener *listener, void *data) {
+	struct wlr_event_pointer_motion *event = data;
+	struct wlr_cursor_device *device =
+		wl_container_of(listener, device, motion);
+	wl_signal_emit(&device->cursor->events.motion, event);
+}
+
+static void handle_pointer_motion_absolute(struct wl_listener *listener,
+		void *data) {
+	struct wlr_event_pointer_motion_absolute *event = data;
+	struct wlr_cursor_device *device =
+		wl_container_of(listener, device, motion_absolute);
+	wl_signal_emit(&device->cursor->events.motion_absolute, event);
+}
+
+static void handle_pointer_button(struct wl_listener *listener, void *data) {
+	struct wlr_event_pointer_button *event = data;
+	struct wlr_cursor_device *device =
+		wl_container_of(listener, device, button);
+	wl_signal_emit(&device->cursor->events.button, event);
+}
+
+static void handle_pointer_axis(struct wl_listener *listener, void *data) {
+	struct wlr_event_pointer_axis *event = data;
+	struct wlr_cursor_device *device = wl_container_of(listener, device, axis);
+	wl_signal_emit(&device->cursor->events.axis, event);
+}
+
+static void handle_touch_up(struct wl_listener *listener, void *data) {
+	struct wlr_event_touch_up *event = data;
+	struct wlr_cursor_device *device;
+	device = wl_container_of(listener, device, touch_up);
+	wl_signal_emit(&device->cursor->events.touch_up, event);
+}
+
+static void handle_touch_down(struct wl_listener *listener, void *data) {
+	struct wlr_event_touch_down *event = data;
+	struct wlr_cursor_device *device;
+	device = wl_container_of(listener, device, touch_down);
+	wl_signal_emit(&device->cursor->events.touch_down, event);
+}
+
+static void handle_touch_motion(struct wl_listener *listener, void *data) {
+	struct wlr_event_touch_motion *event = data;
+	struct wlr_cursor_device *device;
+	device = wl_container_of(listener, device, touch_motion);
+	wl_signal_emit(&device->cursor->events.touch_motion, event);
+}
+
+static void handle_touch_cancel(struct wl_listener *listener, void *data) {
+	struct wlr_event_touch_cancel *event = data;
+	struct wlr_cursor_device *device;
+	device = wl_container_of(listener, device, touch_cancel);
+	wl_signal_emit(&device->cursor->events.touch_cancel, event);
+}
+
+static void handle_tablet_tool_tip(struct wl_listener *listener, void *data) {
+	struct wlr_event_tablet_tool_tip *event = data;
+	struct wlr_cursor_device *device;
+	device = wl_container_of(listener, device, tablet_tool_tip);
+	wl_signal_emit(&device->cursor->events.tablet_tool_tip, event);
+}
+
+static void handle_tablet_tool_axis(struct wl_listener *listener, void *data) {
+	struct wlr_event_tablet_tool_axis *event = data;
+	struct wlr_cursor_device *device;
+	device = wl_container_of(listener, device, tablet_tool_axis);
+	wl_signal_emit(&device->cursor->events.tablet_tool_axis, event);
+}
+
+static void handle_tablet_tool_button(struct wl_listener *listener,
+		void *data) {
+	struct wlr_event_tablet_tool_button *event = data;
+	struct wlr_cursor_device *device;
+	device = wl_container_of(listener, device, tablet_tool_button);
+	wl_signal_emit(&device->cursor->events.tablet_tool_button, event);
+}
+
+static void handle_tablet_tool_proximity(struct wl_listener *listener,
+		void *data) {
+	struct wlr_event_tablet_tool_proximity *event = data;
+	struct wlr_cursor_device *device;
+	device = wl_container_of(listener, device, tablet_tool_proximity);
+	wl_signal_emit(&device->cursor->events.tablet_tool_proximity, event);
+}
+
+static void handle_device_destroy(struct wl_listener *listener, void *data) {
+	struct wlr_cursor_device *c_device;
+	c_device = wl_container_of(listener, c_device, destroy);
+	wlr_cursor_detach_input_device(c_device->cursor, c_device->device);
+}
+
+void wlr_cursor_attach_input_device(struct wlr_cursor *cur,
+		struct wlr_input_device *dev) {
+	if (dev->type != WLR_INPUT_DEVICE_POINTER &&
+			dev->type != WLR_INPUT_DEVICE_TOUCH &&
+			dev->type != WLR_INPUT_DEVICE_TABLET_TOOL) {
+		wlr_log(L_ERROR, "only device types of pointer, touch or tablet tool"
+				"are supported");
+		return;
+	}
+
+	// make sure it is not already attached
+	struct wlr_cursor_device *_dev;
+	wl_list_for_each(_dev, &cur->state->devices, link) {
+		if (_dev->device == dev) {
+			return;
+		}
+	}
+
+	struct wlr_cursor_device *device;
+	device = calloc(1, sizeof(struct wlr_cursor_device));
+	if (!device) {
+		wlr_log(L_ERROR, "Failed to allocate wlr_cursor_device");
+		return;
+	}
+
+	device->cursor = cur;
+	device->device = dev;
+
+	// listen to events
+
+	wl_signal_add(&dev->events.destroy, &device->destroy);
+	device->destroy.notify = handle_device_destroy;
+
+	if (dev->type == WLR_INPUT_DEVICE_POINTER) {
+		wl_signal_add(&dev->pointer->events.motion, &device->motion);
+		device->motion.notify = handle_pointer_motion;
+
+		wl_signal_add(&dev->pointer->events.motion_absolute,
+			&device->motion_absolute);
+		device->motion_absolute.notify = handle_pointer_motion_absolute;
+
+		wl_signal_add(&dev->pointer->events.button, &device->button);
+		device->button.notify = handle_pointer_button;
+
+		wl_signal_add(&dev->pointer->events.axis, &device->axis);
+		device->axis.notify = handle_pointer_axis;
+	} else if (dev->type == WLR_INPUT_DEVICE_TOUCH) {
+		wl_signal_add(&dev->touch->events.motion, &device->touch_motion);
+		device->touch_motion.notify = handle_touch_motion;
+
+		wl_signal_add(&dev->touch->events.down, &device->touch_down);
+		device->touch_down.notify = handle_touch_down;
+
+		wl_signal_add(&dev->touch->events.up, &device->touch_up);
+		device->touch_up.notify = handle_touch_up;
+
+		wl_signal_add(&dev->touch->events.cancel, &device->touch_cancel);
+		device->touch_cancel.notify = handle_touch_cancel;
+	} else if (dev->type == WLR_INPUT_DEVICE_TABLET_TOOL) {
+		wl_signal_add(&dev->tablet_tool->events.tip, &device->tablet_tool_tip);
+		device->tablet_tool_tip.notify = handle_tablet_tool_tip;
+
+		wl_signal_add(&dev->tablet_tool->events.proximity,
+			&device->tablet_tool_proximity);
+		device->tablet_tool_proximity.notify = handle_tablet_tool_proximity;
+
+		wl_signal_add(&dev->tablet_tool->events.axis,
+			&device->tablet_tool_axis);
+		device->tablet_tool_axis.notify = handle_tablet_tool_axis;
+
+		wl_signal_add(&dev->tablet_tool->events.button,
+			&device->tablet_tool_button);
+		device->tablet_tool_button.notify = handle_tablet_tool_button;
+	}
+
+	wl_list_insert(&cur->state->devices, &device->link);
+}
+
+void wlr_cursor_detach_input_device(struct wlr_cursor *cur,
+		struct wlr_input_device *dev) {
+	struct wlr_cursor_device *target_device = NULL, *_device = NULL;
+	wl_list_for_each(_device, &cur->state->devices, link) {
+		if (_device->device == dev) {
+			target_device = _device;
+			break;
+		}
+	}
+
+	if (target_device) {
+		wl_list_remove(&target_device->link);
+		free(target_device);
+	}
+}
+
+void wlr_cursor_attach_output_layout(struct wlr_cursor *cur,
+		struct wlr_output_layout *l) {
+	cur->state->layout = l;
+}
+
+void wlr_cursor_map_to_output(struct wlr_cursor *cur,
+		struct wlr_output *output) {
+	cur->state->mapped_output = output;
+}
+
+void wlr_cursor_map_input_to_output(struct wlr_cursor *cur,
+		struct wlr_input_device *dev, struct wlr_output *output) {
+	struct wlr_cursor_device *c_device = get_cursor_device(cur, dev);
+	if (!c_device) {
+		wlr_log(L_ERROR, "Cannot map device \"%s\" to output"
+			"(not found in this cursor)", dev->name);
+		return;
+	}
+
+	c_device->mapped_output = output;
+}
+
+void wlr_cursor_map_to_region(struct wlr_cursor *cur,
+		struct wlr_box *box) {
+	if (box && wlr_box_empty(box)) {
+		wlr_log(L_ERROR, "cannot map cursor to an empty region");
+		return;
+	}
+
+	cur->state->mapped_box = box;
+}
+
+void wlr_cursor_map_input_to_region(struct wlr_cursor *cur,
+		struct wlr_input_device *dev, struct wlr_box *box) {
+	if (box && wlr_box_empty(box)) {
+		wlr_log(L_ERROR, "cannot map device \"%s\" input to an empty region",
+			dev->name);
+		return;
+	}
+
+	struct wlr_cursor_device *c_device = get_cursor_device(cur, dev);
+	if (!c_device) {
+		wlr_log(L_ERROR, "Cannot map device \"%s\" to geometry (not found in"
+			"this cursor)", dev->name);
+		return;
+	}
+
+	c_device->mapped_box = box;
+}

types/wlr_input_device.c

@@ -20,12 +20,16 @@ void wlr_input_device_init(struct wlr_input_device *dev,
 	dev->name = strdup(name);
 	dev->vendor = vendor;
 	dev->product = product;
+
+	wl_signal_init(&dev->events.destroy);
 }
 
 void wlr_input_device_destroy(struct wlr_input_device *dev) {
 	if (!dev) {
 		return;
 	}
+
+	wl_signal_emit(&dev->events.destroy, dev);
 	
 	if (dev->_device) {
 		switch (dev->type) {

types/wlr_output_layout.c

@@ -1,15 +1,37 @@
 #include <wlr/util/log.h>
 #include <wlr/types/wlr_output.h>
 #include <wlr/types/wlr_output_layout.h>
+#include <wlr/types/wlr_box.h>
+#include <limits.h>
+#include <float.h>
 #include <stdlib.h>
 #include <assert.h>
 
+struct wlr_output_layout_state {
+	struct wlr_box *_box;
+};
+
+struct wlr_output_layout_output_state {
+	struct wlr_box *_box;
+};
+
 struct wlr_output_layout *wlr_output_layout_init() {
-	struct wlr_output_layout *layout = calloc(1, sizeof(struct wlr_output_layout));
+	struct wlr_output_layout *layout =
+		calloc(1, sizeof(struct wlr_output_layout));
+	layout->state = calloc(1, sizeof(struct wlr_output_layout_state));
+	layout->state->_box = calloc(1, sizeof(struct wlr_box));
 	wl_list_init(&layout->outputs);
 	return layout;
 }
 
+static void wlr_output_layout_output_destroy(
+		struct wlr_output_layout_output *l_output) {
+	wl_list_remove(&l_output->link);
+	free(l_output->state->_box);
+	free(l_output->state);
+	free(l_output);
+}
+
 void wlr_output_layout_destroy(struct wlr_output_layout *layout) {
 	if (!layout) {
 		return;
@@ -17,28 +39,32 @@ void wlr_output_layout_destroy(struct wlr_output_layout *layout) {
 
 	struct wlr_output_layout_output *_output, *temp = NULL;
 	wl_list_for_each_safe(_output, temp, &layout->outputs, link) {
-		wl_list_remove(&_output->link);
+		wlr_output_layout_output_destroy(_output);
-		free(_output);
 	}
 
+	free(layout->state->_box);
+	free(layout->state);
 	free(layout);
 }
 
 void wlr_output_layout_add(struct wlr_output_layout *layout,
 		struct wlr_output *output, int x, int y) {
-	struct wlr_output_layout_output *layout_output = calloc(1, sizeof(struct wlr_output_layout_output));
+	struct wlr_output_layout_output *l_output;
-	layout_output->output = output;
+	l_output= calloc(1, sizeof(struct wlr_output_layout_output));
-	layout_output->x = x;
+	l_output->state = calloc(1, sizeof(struct wlr_output_layout_output_state));
-	layout_output->y = y;
+	l_output->state->_box = calloc(1, sizeof(struct wlr_box));
-	wl_list_insert(&layout->outputs, &layout_output->link);
+	l_output->output = output;
+	l_output->x = x;
+	l_output->y = y;
+	wl_list_insert(&layout->outputs, &l_output->link);
 }
 
 struct wlr_output_layout_output *wlr_output_layout_get(
 		struct wlr_output_layout *layout, struct wlr_output *reference) {
-	struct wlr_output_layout_output *_output;
+	struct wlr_output_layout_output *l_output;
-	wl_list_for_each(_output, &layout->outputs, link) {
+	wl_list_for_each(l_output, &layout->outputs, link) {
-		if (_output->output == reference) {
+		if (l_output->output == reference) {
-			return _output;
+			return l_output;
 		}
 	}
 	return NULL;
@@ -52,15 +78,21 @@ static bool output_contains_point( struct wlr_output_layout_output *l_output,
 
 bool wlr_output_layout_contains_point(struct wlr_output_layout *layout,
 		struct wlr_output *reference, int x, int y) {
-	struct wlr_output_layout_output *layout_output = wlr_output_layout_get(layout, reference);
+	if (reference) {
-	int width, height;
+		struct wlr_output_layout_output *layout_output =
-	wlr_output_effective_resolution(layout_output->output, &width, &height);
+			wlr_output_layout_get(layout, reference);
-	return output_contains_point(layout_output, x, y, width, height);
+		int width, height;
+		wlr_output_effective_resolution(layout_output->output, &width, &height);
+		return output_contains_point(layout_output, x, y, width, height);
+	} else {
+		return !!wlr_output_layout_output_at(layout, x, y);
+	}
 }
 
 bool wlr_output_layout_intersects(struct wlr_output_layout *layout,
 		struct wlr_output *reference, int x1, int y1, int x2, int y2) {
-	struct wlr_output_layout_output *l_output = wlr_output_layout_get(layout, reference);
+	struct wlr_output_layout_output *l_output =
+		wlr_output_layout_get(layout, reference);
 	if (!l_output) {
 		return false;
 	}
@@ -76,15 +108,15 @@ bool wlr_output_layout_intersects(struct wlr_output_layout *layout,
 
 struct wlr_output *wlr_output_layout_output_at(struct wlr_output_layout *layout,
 		double x, double y) {
-	struct wlr_output_layout_output *_output;
+	struct wlr_output_layout_output *l_output;
-	wl_list_for_each(_output, &layout->outputs, link) {
+	wl_list_for_each(l_output, &layout->outputs, link) {
-		if (_output->output) {
+		if (l_output->output) {
 			int width, height;
-			wlr_output_effective_resolution(_output->output, &width, &height);
+			wlr_output_effective_resolution(l_output->output, &width, &height);
-			bool has_x = x >= _output->x && x <= _output->x + width;
+			bool has_x = x >= l_output->x && x <= l_output->x + width;
-			bool has_y = y >= _output->y && y <= _output->y + height;
+			bool has_y = y >= l_output->y && y <= l_output->y + height;
 			if (has_x && has_y) {
-				return _output->output;
+				return l_output->output;
 			}
 		}
 	}
@@ -93,36 +125,112 @@ struct wlr_output *wlr_output_layout_output_at(struct wlr_output_layout *layout,
 
 void wlr_output_layout_move(struct wlr_output_layout *layout,
 		struct wlr_output *output, int x, int y) {
-	struct wlr_output_layout_output *layout_output =
+	struct wlr_output_layout_output *l_output =
-			wlr_output_layout_get(layout, output);
+		wlr_output_layout_get(layout, output);
-	if (layout_output) {
+	if (l_output) {
-		layout_output->x = x;
+		l_output->x = x;
-		layout_output->y = y;
+		l_output->y = y;
 	}
 }
 
 void wlr_output_layout_remove(struct wlr_output_layout *layout,
 		struct wlr_output *output) {
-	struct wlr_output_layout_output *layout_output =
+	struct wlr_output_layout_output *l_output;
-			wlr_output_layout_get(layout, output);
+	l_output= wlr_output_layout_get(layout, output);
-	if (layout_output) {
+	if (l_output) {
-		wl_list_remove(&layout_output->link);
+		wlr_output_layout_output_destroy(l_output);
-		free(layout_output);
 	}
 }
 
 void wlr_output_layout_output_coords(struct wlr_output_layout *layout,
-		struct wlr_output *reference, int *x, int *y) {
+		struct wlr_output *reference, double *x, double *y) {
 	assert(layout && reference);
-	int src_x = *x;
+	double src_x = *x;
-	int src_y = *y;
+	double src_y = *y;
 
-	struct wlr_output_layout_output *_output;
+	struct wlr_output_layout_output *l_output;
-	wl_list_for_each(_output, &layout->outputs, link) {
+	wl_list_for_each(l_output, &layout->outputs, link) {
-		if (_output->output == reference) {
+		if (l_output->output == reference) {
-			*x = src_x - _output->x;
+			*x = src_x - (double)l_output->x;
-			*y = src_y - _output->y;
+			*y = src_y - (double)l_output->y;
 			return;
 		}
 	}
 }
+
+static struct wlr_box *wlr_output_layout_output_get_box(
+		struct wlr_output_layout_output *l_output) {
+		l_output->state->_box->x = l_output->x;
+		l_output->state->_box->y = l_output->y;
+		wlr_output_effective_resolution(l_output->output,
+			&l_output->state->_box->width, &l_output->state->_box->height);
+		return l_output->state->_box;
+}
+
+void wlr_output_layout_closest_point(struct wlr_output_layout *layout,
+		struct wlr_output *reference, double x, double y, double *dest_x,
+		double *dest_y) {
+	double min_x = DBL_MAX, min_y = DBL_MAX, min_distance = DBL_MAX;
+	struct wlr_output_layout_output *l_output;
+	wl_list_for_each(l_output, &layout->outputs, link) {
+		if (reference != NULL && reference != l_output->output) {
+			continue;
+		}
+
+		double output_x, output_y, output_distance;
+		struct wlr_box *box = wlr_output_layout_output_get_box(l_output);
+		wlr_box_closest_point(box, x, y, &output_x, &output_y);
+
+		// calculate squared distance suitable for comparison
+		output_distance =
+			(x - output_x) * (x - output_x) + (y - output_y) * (y - output_y);
+
+		if (output_distance < min_distance) {
+			min_x = output_x;
+			min_y = output_y;
+			min_distance = output_distance;
+		}
+	}
+
+	*dest_x = min_x;
+	*dest_y = min_y;
+}
+
+struct wlr_box *wlr_output_layout_get_box(
+		struct wlr_output_layout *layout, struct wlr_output *reference) {
+	struct wlr_output_layout_output *l_output;
+	if (reference) {
+		// output extents
+		l_output= wlr_output_layout_get(layout, reference);
+		return wlr_output_layout_output_get_box(l_output);
+	} else {
+		// layout extents
+		int min_x = INT_MAX, min_y = INT_MAX;
+		int max_x = INT_MIN, max_y = INT_MIN;
+		wl_list_for_each(l_output, &layout->outputs, link) {
+			int width, height;
+			wlr_output_effective_resolution(l_output->output, &width, &height);
+			if (l_output->x < min_x) {
+				min_x = l_output->x;
+			}
+			if (l_output->y < min_y) {
+				min_y = l_output->y;
+			}
+			if (l_output->x + width > max_x) {
+				max_x = l_output->x + width;
+			}
+			if (l_output->y + height > max_y) {
+				max_y = l_output->y + height;
+			}
+		}
+
+		layout->state->_box->x = min_x;
+		layout->state->_box->y = min_y;
+		layout->state->_box->width = max_x - min_x;
+		layout->state->_box->height = max_y - min_y;
+
+		return layout->state->_box;
+	}
+
+	// not reached
+}