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-rw-r--r--libass/ass_parse.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/libass/ass_parse.c b/libass/ass_parse.c
index 1d97a31..63bce2b 100644
--- a/libass/ass_parse.c
+++ b/libass/ass_parse.c
@@ -207,11 +207,11 @@ inline uint32_t mult_alpha(uint32_t a, uint32_t b)
* \brief Calculate alpha value by piecewise linear function
* Used for \fad, \fade implementation.
*/
-static unsigned
+static int
interpolate_alpha(long long now, long long t1, long long t2, long long t3,
- long long t4, unsigned a1, unsigned a2, unsigned a3)
+ long long t4, int a1, int a2, int a3)
{
- unsigned a;
+ int a;
double cf;
if (now < t1) {