compositor: Add weston_layer_mask_is_infinite

As a counterpart to weston_layer_set_mask_infinite(), returning if the
mask is the same as what is set.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>

libweston/compositor.c

@@ -2746,6 +2746,15 @@ weston_layer_set_mask_infinite(struct weston_layer *layer)
 				     UINT32_MAX, UINT32_MAX);
 }
 
+WL_EXPORT bool
+weston_layer_mask_is_infinite(struct weston_layer *layer)
+{
+	return layer->mask.x1 == INT32_MIN &&
+	       layer->mask.y1 == INT32_MIN &&
+	       layer->mask.x2 == INT32_MIN + UINT32_MAX &&
+	       layer->mask.y2 == INT32_MIN + UINT32_MAX;
+}
+
 WL_EXPORT void
 weston_output_schedule_repaint(struct weston_output *output)
 {

libweston/compositor.h

@@ -1685,6 +1685,9 @@ weston_layer_set_mask(struct weston_layer *layer, int x, int y, int width, int h
 void
 weston_layer_set_mask_infinite(struct weston_layer *layer);
 
+bool
+weston_layer_mask_is_infinite(struct weston_layer *layer);
+
 void
 weston_plane_init(struct weston_plane *plane,
 			struct weston_compositor *ec,