new function swf_OptimizeTagOrder.

[swftools.git] / lib / rfxswf.c

diff --git a/lib/rfxswf.c b/lib/rfxswf.c
index 7824dee..28891e4 100644 (file)
--- a/lib/rfxswf.c
+++ b/lib/rfxswf.c
@@ -865,6 +865,56 @@ void swf_UnFoldAll(SWF*swf)
     }
 }
 
+void swf_OptimizeTagOrder(SWF*swf)
+{
+  TAG*tag,*next;
+  TAG*level0;
+  int level;
+  int changes;
+  swf_UnFoldAll(swf);
+  /* at the moment, we don't actually do optimizing,
+     only fixing of non-spec-conformant things like
+     sprite tags */
+
+  do {
+    changes = 0;
+    level = 0;
+    level0 = 0;
+    tag = swf->firstTag;
+    while(tag) {
+      next = tag->next;
+      if(tag->id == ST_DEFINESPRITE) {
+       level++;
+       if(level==1) {
+         level0 = tag;
+         tag = next;
+         continue;
+       }
+      }
+      if(level>=1) {
+       /* move non-sprite tags out of sprite */
+       if(!swf_isAllowedSpriteTag(tag) || level>=2) {
+         /* remove tag from current position */
+         tag->prev->next = tag->next;
+         tag->next->prev = tag->prev;
+
+         /* insert before tag level0 */
+         tag->next = level0;
+         tag->prev = level0->prev;
+         level0->prev = tag;
+         tag->prev->next = tag;
+         changes = 1;
+       }
+      }
+      if(tag->id == ST_END) {
+       level--;
+      }
+
+      tag = next;
+    }
+  } while(changes);
+}
+
 // Movie Functions
 
 int swf_ReadSWF2(struct reader_t*reader, SWF * swf)   // Reads SWF to memory (malloc'ed), returns length or <0 if fails