From 8931452e1d653cb2cf20b0b0a9892cfc11b24af9 Mon Sep 17 00:00:00 2001
From: Markus Ongyerth <ongy@ongy.net>
Date: Tue, 8 May 2018 15:19:31 +0200
Subject: add wlr_layer_surface_surface_at

Adds wlr_layer_surface_surface_at, this is consistent with the other
shell implementations, and simplifies handling in compositors.
---
 include/wlr/types/wlr_layer_shell.h |  8 ++++++++
 rootston/desktop.c                  | 31 +++++++++----------------------
 types/wlr_layer_shell.c             | 22 ++++++++++++++++++++++
 3 files changed, 39 insertions(+), 22 deletions(-)

diff --git a/include/wlr/types/wlr_layer_shell.h b/include/wlr/types/wlr_layer_shell.h
index 22352906..1477989d 100644
--- a/include/wlr/types/wlr_layer_shell.h
+++ b/include/wlr/types/wlr_layer_shell.h
@@ -113,4 +113,12 @@ struct wlr_layer_surface *wlr_layer_surface_from_wlr_surface(
 void wlr_layer_surface_for_each_surface(struct wlr_layer_surface *surface,
 		wlr_surface_iterator_func_t iterator, void *user_data);
 
+/**
+ * Find a surface within this layer-surface tree at the given surface-local
+ * coordinates. Returns the surface and coordinates in the leaf surface
+ * coordinate system or NULL if no surface is found at that location.
+ */
+struct wlr_surface *wlr_layer_surface_surface_at(
+		struct wlr_layer_surface *surface, double sx, double sy,
+		double *sub_x, double *sub_y);
 #endif
diff --git a/rootston/desktop.c b/rootston/desktop.c
index 6ac665bc..192c7da0 100644
--- a/rootston/desktop.c
+++ b/rootston/desktop.c
@@ -641,30 +641,17 @@ static struct wlr_surface *layer_surface_at(struct roots_output *output,
 		struct wl_list *layer, double ox, double oy, double *sx, double *sy) {
 	struct roots_layer_surface *roots_surface;
 	wl_list_for_each_reverse(roots_surface, layer, link) {
-		struct wlr_surface *wlr_surface;
-		double _sx, _sy;
-		struct wlr_xdg_popup *popup;
-		wl_list_for_each(popup, &roots_surface->layer_surface->popups, link) {
-			wlr_surface = popup->base->surface;
-			 _sx = ox - roots_surface->geo.x - popup->geometry.x;
-			 _sy = oy - roots_surface->geo.y - popup->geometry.y;
-			if (wlr_surface_point_accepts_input(wlr_surface, _sx, _sy)) {
-				*sx = _sx;
-				*sy = _sy;
-				return wlr_surface;
-			}
-			// TODO: popups can have popups
-		}
-		// TODO: Test subsurfaces
-		wlr_surface = roots_surface->layer_surface->surface;
-		 _sx = ox - roots_surface->geo.x;
-		 _sy = oy - roots_surface->geo.y;
-		if (wlr_surface_point_accepts_input(wlr_surface, _sx, _sy)) {
-			*sx = _sx;
-			*sy = _sy;
-			return wlr_surface;
+		double _sx = ox - roots_surface->geo.x;
+		double _sy = oy - roots_surface->geo.y;
+
+		struct wlr_surface *sub = wlr_layer_surface_surface_at(
+			roots_surface->layer_surface, _sx, _sy, sx, sy);
+
+		if (sub) {
+			return sub;
 		}
 	}
+
 	return NULL;
 }
 
diff --git a/types/wlr_layer_shell.c b/types/wlr_layer_shell.c
index fd7bc659..0fae048c 100644
--- a/types/wlr_layer_shell.c
+++ b/types/wlr_layer_shell.c
@@ -531,3 +531,25 @@ void wlr_layer_surface_for_each_surface(struct wlr_layer_surface *surface,
 		wlr_surface_iterator_func_t iterator, void *user_data) {
 	layer_surface_for_each_surface(surface, 0, 0, iterator, user_data);
 }
+
+struct wlr_surface *wlr_layer_surface_surface_at(
+		struct wlr_layer_surface *surface, double sx, double sy,
+		double *sub_x, double *sub_y) {
+	struct wlr_xdg_popup *popup_state;
+	wl_list_for_each(popup_state, &surface->popups, link) {
+		struct wlr_xdg_surface *popup = popup_state->base;
+
+		double popup_sx = popup_state->geometry.x - popup->geometry.x;
+		double popup_sy = popup_state->geometry.y - popup->geometry.y;
+
+		struct wlr_surface *sub = wlr_xdg_surface_surface_at(popup,
+			sx - popup_sx,
+			sy - popup_sy,
+			sub_x, sub_y);
+		if (sub != NULL) {
+			return sub;
+		}
+	}
+
+	return wlr_surface_surface_at(surface->surface, sx, sy, sub_x, sub_y);
+}
-- 
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