Add hack to support empty lines of text

Consecutive forced breaks (\N\N) can be used to create empty lines of
text in other renderers. This doesn't work with the current text
layouter (wrap_lines_smart). This hack inserts a space glyph between two
consecutive forced breaks to get around this limitation.

diff --git a/libass/ass_render.c b/libass/ass_render.c
index f2a34b2d0763cd3cafea83b22c3e68952efbe1d5..870623e23e375270fab23cbe668a4a1f2db54743 100644 (file)
--- a/libass/ass_render.c
+++ b/libass/ass_render.c
@@ -2224,6 +2224,14 @@ ass_render_event(ass_renderer_t *render_priv, ass_event_t *event,
         if (code == 0)
             break;
 
+        // Insert space between two forced breaks to create empty lines
+        // FIXME: should probably be done in wrap_lines_smart,
+        // this is a hack
+        if (previous == '\n' && code == '\n') {
+            code = ' ';
+            p -= 2;
+        }
+
         if (text_info->length >= text_info->max_glyphs) {
             // Raise maximum number of glyphs
             text_info->max_glyphs *= 2;