From: Oleg Oshmyan <chortos@inbox.lv>
Date: Wed, 30 Apr 2014 23:32:50 +0000 (+0100)
Subject: Make \be animatable
X-Git-Tag: 0.12.0~29
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=b3c2b31e71b5d4e64954146658ef58be7d459e19;p=libass

Make \be animatable

VSFilter has supported this since version 2.39.

Use the raw floating-point value of the \be argument in the animation
formula, like xy-VSFilter has done since version 3.0.0.45 (404301a3).
---

diff --git a/libass/ass_parse.c b/libass/ass_parse.c
index c572955..b8c2547 100644
--- a/libass/ass_parse.c
+++ b/libass/ass_parse.c
@@ -730,8 +730,11 @@ char *parse_tag(ASS_Renderer *render_priv, char *p, double pwr)
         } else
             reset_render_context(render_priv, NULL);
     } else if (mystrcmp(&p, "be")) {
-        int val;
-        if (mystrtoi(&p, &val)) {
+        double dval;
+        if (mystrtod(&p, &dval)) {
+            int val;
+            // VSFilter always adds +0.5, even if the value is negative
+            val = (int) (render_priv->state.be * (1 - pwr) + dval * pwr + 0.5);
             // Clamp to a safe upper limit, since high values need excessive CPU
             val = (val < 0) ? 0 : val;
             val = (val > MAX_BE) ? MAX_BE : val;