From 272030652a73fd54472726e3ccd693402868fd35 Mon Sep 17 00:00:00 2001
From: nyorain <nyorain@gmail.com>
Date: Thu, 22 Jun 2017 17:54:51 +0200
Subject: [PATCH] Implement absolute motion events for wayland

---
 backend/wayland/backend.c | 13 ++++++++++++-
 backend/wayland/wl_seat.c | 39 ++++++++++++++++++++++-----------------
 include/backend/wayland.h |  7 ++++---
 3 files changed, 38 insertions(+), 21 deletions(-)

diff --git a/backend/wayland/backend.c b/backend/wayland/backend.c
index a6029500..ef480c18 100644
--- a/backend/wayland/backend.c
+++ b/backend/wayland/backend.c
@@ -63,7 +63,7 @@ static bool wlr_wl_backend_init(struct wlr_backend_state* state) {
 	state->remote_display_src = wl_event_loop_add_fd(loop, fd, events,
 			dispatch_events, state);
 	wl_event_source_check(state->remote_display_src);
-	
+
 	return true;
 }
 
@@ -102,6 +102,17 @@ bool wlr_backend_is_wl(struct wlr_backend *b) {
 	return b->impl == &backend_impl;
 }
 
+struct wlr_output *wlr_wl_output_for_surface(struct wlr_backend_state *backend,
+	struct wl_surface *surface) {
+	for (size_t i = 0; i < backend->outputs->length; ++i) {
+		struct wlr_output *output = backend->outputs->items[i];
+		if(output->state->surface == surface)
+			return output;
+	}
+
+	return NULL;
+}
+
 struct wlr_backend *wlr_wl_backend_create(struct wl_display *display) {
 	wlr_log(L_INFO, "Creating wayland backend");
 
diff --git a/backend/wayland/wl_seat.c b/backend/wayland/wl_seat.c
index f4d3cd52..6d3b8b05 100644
--- a/backend/wayland/wl_seat.c
+++ b/backend/wayland/wl_seat.c
@@ -17,9 +17,15 @@ static void pointer_handle_enter(void *data, struct wl_pointer *wl_pointer,
 		wl_fixed_t surface_y) {
 	struct wlr_input_device *dev = data;
 	assert(dev && dev->pointer && dev->pointer->state);
-	struct wlr_pointer_state *state = dev->pointer->state;
-	state->surface_x = wl_fixed_to_double(surface_x);
-	state->surface_y = wl_fixed_to_double(surface_y);
+	struct wlr_output* output = wlr_wl_output_for_surface(dev->state->backend,
+			surface);
+
+	if (!output) {
+		wlr_log(L_ERROR, "pointer entered invalid surface");
+		return;
+	}
+
+	dev->pointer->state->current_output = output;
 }
 
 static void pointer_handle_leave(void *data, struct wl_pointer *wl_pointer,
@@ -32,22 +38,20 @@ static void pointer_handle_motion(void *data, struct wl_pointer *wl_pointer,
 	struct wlr_input_device *dev = data;
 	assert(dev && dev->pointer && dev->pointer->state);
 	struct wlr_pointer_state *state = dev->pointer->state;
+	assert(state->current_output);
 
-	double x = wl_fixed_to_double(surface_x);
-	double y = wl_fixed_to_double(surface_y);
+	int width, height;
+	wl_egl_window_get_attached_size(state->current_output->state->egl_window,
+		&width, &height);
 
-	if (x == state->surface_x && y == state->surface_y)
-		return;
-
-	struct wlr_event_pointer_motion wlr_event;
+	struct wlr_event_pointer_motion_absolute wlr_event;
 	wlr_event.time_sec = time / 1000;
 	wlr_event.time_usec = time * 1000;
-	wlr_event.delta_x = x - state->surface_x;
-	wlr_event.delta_y = y - state->surface_y;
-	wl_signal_emit(&dev->pointer->events.motion, &wlr_event);
-
-	state->surface_x = x;
-	state->surface_y = y;
+	wlr_event.width_mm = width;
+	wlr_event.height_mm = height;
+	wlr_event.x_mm = wl_fixed_to_double(surface_x);
+	wlr_event.y_mm = wl_fixed_to_double(surface_y);
+	wl_signal_emit(&dev->pointer->events.motion_absolute, &wlr_event);
 }
 
 static void pointer_handle_button(void *data, struct wl_pointer *wl_pointer,
@@ -73,7 +77,7 @@ static void pointer_handle_axis(void *data, struct wl_pointer *wl_pointer,
 	wlr_event.orientation = axis;
 	wlr_event.time_sec = time / 1000;
 	wlr_event.time_usec = time * 1000;
-	wlr_event.source = WLR_AXIS_SOURCE_CONTINUOUS; // TODO
+	wlr_event.source = WLR_AXIS_SOURCE_CONTINUOUS;
 	wl_signal_emit(&dev->pointer->events.axis, &wlr_event);
 }
 
@@ -182,7 +186,8 @@ static struct wlr_input_device *allocate_device(struct wlr_backend_state *state,
 		return NULL;
 	}
 
-	// TODO: any way to retrieve those information?
+	devstate->backend = state;
+
 	int vendor = 0;
 	int product = 0;
 	const char *name = "wayland";
diff --git a/include/backend/wayland.h b/include/backend/wayland.h
index 8138101c..df817598 100644
--- a/include/backend/wayland.h
+++ b/include/backend/wayland.h
@@ -39,16 +39,17 @@ struct wlr_output_state {
 };
 
 struct wlr_input_device_state {
-	enum wlr_input_device_type type;
+	struct wlr_backend_state* backend;
 	void *resource;
 };
 
 struct wlr_pointer_state {
-	double surface_x;
-	double surface_y;
+	struct wlr_output *current_output;
 };
 
 void wlr_wl_registry_poll(struct wlr_backend_state *backend);
+struct wlr_output *wlr_wl_output_for_surface(struct wlr_backend_state *backend,
+	struct wl_surface *surface);
 
 extern const struct wl_seat_listener seat_listener;