From a9571fcc0f3d8c3f9033170660dc3b39103b2867 Mon Sep 17 00:00:00 2001
From: wm4 <wm4@nowhere>
Date: Tue, 29 Aug 2017 15:15:34 +0200
Subject: vo_opengl: don't discard buffered video on redundant resize calls

If a VO-area option changes, gl_video_resize() is called
unconditionally. This function does something even if the size does not
change (at least it discards buffered frames for interpolation), which
can lead to stutter when you keep firing option change events during
playback.

Check for an actual resize, and if nothing changes, exit early.
---
 sub/osd.c | 2 +-
 sub/osd.h | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

(limited to 'sub')

diff --git a/sub/osd.c b/sub/osd.c
index 9517595ff3..0d594cd24d 100644
--- a/sub/osd.c
+++ b/sub/osd.c
@@ -104,7 +104,7 @@ const struct m_sub_options sub_style_conf = {
     .change_flags = UPDATE_OSD,
 };
 
-static bool osd_res_equals(struct mp_osd_res a, struct mp_osd_res b)
+bool osd_res_equals(struct mp_osd_res a, struct mp_osd_res b)
 {
     return a.w == b.w && a.h == b.h && a.ml == b.ml && a.mt == b.mt
         && a.mr == b.mr && a.mb == b.mb
diff --git a/sub/osd.h b/sub/osd.h
index d139647718..114ab4a8f1 100644
--- a/sub/osd.h
+++ b/sub/osd.h
@@ -82,6 +82,8 @@ struct mp_osd_res {
     double display_par;
 };
 
+bool osd_res_equals(struct mp_osd_res a, struct mp_osd_res b);
+
 // 0 <= sub_bitmaps.render_index < MAX_OSD_PARTS
 #define MAX_OSD_PARTS 5
 
-- 
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