clip: fix rectclipline.

mixed up CLIP[TB] and the slope was being computed as
an integer division, which caused artifacts.

1 files changed, 1 insertions, 1 deletions

diff --git a/internal.h b/internal.h
index a982f2c..6e66229 100644
--- a/internal.h
+++ b/internal.h
@@ -52,7 +52,7 @@ void fprintvattrs(int, Vertex*);
 
 /* clip */
 int clipprimitive(Primitive*);
-void rectclipline(Rectangle, Point*, Point*);
+int rectclipline(Rectangle, Point*, Point*);
 
 /* util */
 int min(int, int);