Fix the linear interpolation during weight mapping

Fixes https://gitlab.freedesktop.org/fontconfig/fontconfig/issues/164
2019-06-19 11:45:05 +02:00 · 2019-06-19 11:45:05 +02:00 · f2d4291d12
parent c0dc76268b
commit f2d4291d12
1 changed files with 1 additions and 1 deletions
--- a/src/fcweight.c
+++ b/src/fcweight.c
@ -46,7 +46,7 @@ static double lerp(double x, int x1, int x2, int y1, int y2)
  int dx = x2 - x1;
  int dy = y2 - y1;
  assert (dx > 0 && dy >= 0 && x1 <= x && x <= x2);
-  return y1 + (dy*(x-x1) + dx/2) / dx;
+  return y1 + (x-x1) * dy / dx;
 }

 double