types/wlr_input_device: move width_mm and height_mm fields to wlr_tablet and wlr_touch

backend/libinput/tablet_tool.c

@@ -25,6 +25,9 @@ void init_device_tablet(struct wlr_libinput_input_device *dev) {
 	wlr_tablet->base.vendor = libinput_device_get_id_vendor(dev->handle);
 	wlr_tablet->base.product = libinput_device_get_id_product(dev->handle);
 
+	libinput_device_get_size(dev->handle, &wlr_tablet->width_mm,
+		&wlr_tablet->height_mm);
+
 	struct udev_device *udev = libinput_device_get_udev_device(dev->handle);
 	char **dst = wl_array_add(&wlr_tablet->paths, sizeof(char *));
 	*dst = strdup(udev_device_get_syspath(udev));

backend/libinput/touch.c

@@ -14,6 +14,9 @@ void init_device_touch(struct wlr_libinput_input_device *dev) {
 	wlr_touch_init(wlr_touch, &libinput_touch_impl, name);
 	wlr_touch->base.vendor = libinput_device_get_id_vendor(dev->handle);
 	wlr_touch->base.product = libinput_device_get_id_product(dev->handle);
+
+	libinput_device_get_size(dev->handle, &wlr_touch->width_mm,
+		&wlr_touch->height_mm);
 }
 
 struct wlr_libinput_input_device *device_from_touch(

examples/tablet.c

@@ -320,11 +320,12 @@ static void new_input_notify(struct wl_listener *listener, void *data) {
 		wl_signal_add(&device->tablet_pad->events.ring, &pstate->ring);
 		wl_list_insert(&sample->tablet_pads, &pstate->link);
 		break;
-	case WLR_INPUT_DEVICE_TABLET_TOOL:
-		sample->width_mm = device->width_mm == 0 ?
-			20 : device->width_mm;
-		sample->height_mm = device->height_mm == 0 ?
-			10 : device->height_mm;
+	case WLR_INPUT_DEVICE_TABLET_TOOL:;
+		struct wlr_tablet *tablet = device->tablet;
+		sample->width_mm = tablet->width_mm == 0 ?
+			20 : tablet->width_mm;
+		sample->height_mm = tablet->height_mm == 0 ?
+			10 : tablet->height_mm;
 
 		struct tablet_tool_state *tstate = calloc(sizeof(struct tablet_tool_state), 1);
 		tstate->device = device;
@@ -344,7 +345,6 @@ static void new_input_notify(struct wl_listener *listener, void *data) {
 	}
 }
 
-
 int main(int argc, char *argv[]) {
 	wlr_log_init(WLR_DEBUG, NULL);
 	struct wl_display *display = wl_display_create();

include/wlr/types/wlr_input_device.h

@@ -29,8 +29,6 @@ struct wlr_input_device {
 	enum wlr_input_device_type type;
 	unsigned int vendor, product;
 	char *name;
-	// Or 0 if not applicable to this device
-	double width_mm, height_mm;
 
 	/* wlr_input_device.type determines which of these is valid */
 	union {

include/wlr/types/wlr_tablet_tool.h

@@ -64,6 +64,8 @@ struct wlr_tablet {
 
 	const struct wlr_tablet_impl *impl;
 
+	double width_mm, height_mm;
+
 	struct {
 		struct wl_signal axis;
 		struct wl_signal proximity;

include/wlr/types/wlr_touch.h

@@ -21,6 +21,7 @@ struct wlr_touch {
 	const struct wlr_touch_impl *impl;
 
 	char *output_name;
+	double width_mm, height_mm;
 
 	struct {
 		struct wl_signal down; // struct wlr_event_touch_down