From 2ed7b0016cd39709730dcd7e4daad0a077dde495 Mon Sep 17 00:00:00 2001
From: Vasily <just.one.man@yandex.ru>
Date: Tue, 24 Mar 2020 13:47:46 +0300
Subject: [PATCH] Make octopus.setDropAnimations(true) mean something

Cherry-picked from: https://github.com/jellyfin/JavascriptSubtitlesOctopus/commit/971a9979517738ec1847350cb057d61c8840d605
---
 src/SubtitleOctopus.cpp | 24 +++++++++++++++++++-----
 1 file changed, 19 insertions(+), 5 deletions(-)

diff --git a/src/SubtitleOctopus.cpp b/src/SubtitleOctopus.cpp
index bfd837c..3f94b4d 100644
--- a/src/SubtitleOctopus.cpp
+++ b/src/SubtitleOctopus.cpp
@@ -165,11 +165,19 @@ static int _is_animated_tag(char *begin, char *end) {
     return 0;
 }
 
-static int _is_event_animated(ASS_Event *event) {
+static void _remove_tag(char *begin, char *end) {
+    // overwrite the tag with whitespace so libass won't see it
+    for (; begin < end; begin++) *begin = ' ';
+}
+
+static int _is_event_animated(ASS_Event *event, bool drop_animations) {
     // event is complex if it's animated in any way,
     // either by having non-empty Effect or
     // by having tags (enclosed in '{}' in Text)
-    if (event->Effect && event->Effect[0] != '\0') return 1;
+    if (event->Effect && event->Effect[0] != '\0') {
+        if (!drop_animations) return 1;
+        event->Effect[0] = '\0';
+    }
 
     int escaped = 0;
     char *tagStart = NULL;
@@ -183,13 +191,19 @@ static int _is_event_animated(ASS_Event *event) {
                 break;
             case '}':
                 if (!escaped && tagStart != NULL) {
-                    if (_is_animated_tag(tagStart, p)) return 1;
+                    if (_is_animated_tag(tagStart, p)) {
+                        if (!drop_animations) return 1;
+                        _remove_tag(tagStart, p);
+                    }
                     tagStart = NULL;
                 }
                 break;
             case ';':
                 if (tagStart != NULL) {
-                    if (_is_animated_tag(tagStart, p)) return 1;
+                    if (_is_animated_tag(tagStart, p)) {
+                        if (!drop_animations) return 1;
+                        _remove_tag(tagStart, p + 1 /* +1 is because we want to drop ';' as well */);
+                    }
                 }
                 tagStart = p + 1;
                 break;
@@ -556,7 +570,7 @@ public:
         ASS_Event *cur = track->events;
         int *animated = m_is_event_animated;
         for (int i = 0; i < track->n_events; i++, cur++, animated++) {
-            *animated = _is_event_animated(cur);
+            *animated = _is_event_animated(cur, m_drop_animations);
         }
     }