* src/psaux/pshints.c (cf2_hintmap_insertHint): Fix midpoint computation.

Replace '(start + end) / 2' with 'start + (end - start) / 2' to avoid overflow. Fixes #1180.
2 years ago · de8f14a8e4
parent 2adb810c3d
commit de8f14a8e4
1 changed files with 4 additions and 2 deletions
--- a/src/psaux/pshints.c
+++ b/src/psaux/pshints.c
@ -693,8 +693,10 @@
        CF2_Fixed  midpoint =
                     cf2_hintmap_map(
                       hintmap->initialHintMap,
-                       ADD_INT32( secondHintEdge->csCoord,
-                                  firstHintEdge->csCoord ) / 2 );
+                       ADD_INT32(
+                         firstHintEdge->csCoord,
+                         SUB_INT32 ( secondHintEdge->csCoord,
+                                     firstHintEdge->csCoord ) / 2 ) );
        CF2_Fixed  halfWidth =
                     FT_MulFix( SUB_INT32( secondHintEdge->csCoord,
                                           firstHintEdge->csCoord ) / 2,