Make positions hidden by overlays range-based rather than character-based,

from Anindya Mukherjee.

1 files changed, 48 insertions, 0 deletions

diff --git a/server-client.c b/server-client.c
index 51988799..dc5074e7 100644
--- a/server-client.c
+++ b/server-client.c
@@ -147,6 +147,54 @@ server_client_clear_overlay(struct client *c)
 	server_redraw_client(c);
 }
 
+/*
+ * Given overlay position and dimensions, return parts of the input range which
+ * are visible.
+ */
+void
+server_client_overlay_range(u_int x, u_int y, u_int sx, u_int sy, u_int px,
+    u_int py, u_int nx, struct overlay_ranges *r)
+{
+	u_int	ox, onx;
+
+	/* Return up to 2 ranges. */
+	r->px[2] = 0;
+	r->nx[2] = 0;
+
+	/* Trivial case of no overlap in the y direction. */
+	if (py < y || py > y + sy - 1) {
+		r->px[0] = px;
+		r->nx[0] = nx;
+		r->px[1] = 0;
+		r->nx[1] = 0;
+		return;
+	}
+
+	/* Visible bit to the left of the popup. */
+	if (px < x) {
+		r->px[0] = px;
+		r->nx[0] = x - px;
+		if (r->nx[0] > nx)
+			r->nx[0] = nx;
+	} else {
+		r->px[0] = 0;
+		r->nx[0] = 0;
+	}
+
+	/* Visible bit to the right of the popup. */
+	ox = x + sx;
+	if (px > ox)
+		ox = px;
+	onx = px + nx;
+	if (onx > ox) {
+		r->px[1] = ox;
+		r->nx[1] = onx - ox;
+	} else {
+		r->px[1] = 0;
+		r->nx[1] = 0;
+	}
+}
+
 /* Check if this client is inside this server. */
 int
 server_client_check_nested(struct client *c)