Make doublebuffering of the timeline sub-window a compile-time option.

Makefile

@@ -57,6 +57,10 @@ ifeq ($(USE_UNOPTIMIZED_DRAWING),yes)
 	CFLAGS+=-DUSE_UNOPTIMIZED_DRAWING
 endif
 
+ifeq ($(USE_SINGLEBUFFERED_TIMELINE),yes)
+	CFLAGS+=-DUSE_SINGLEBUFFERED_TIMELINE
+endif
+
 CFLAGS+=-DVERSION=\"$(VERSION)\" \
 	-DINSTALL_PREFIX=\"$(prefix)\" \
 	-DSYSTEM_PATH=\"$(SYSTEM_PATH)\" \

Timeline/Timeline.C

@@ -46,6 +46,11 @@
 #include "const.h"
 #include "util/debug.h"
 
+#ifdef USE_SINGLEBUFFERED_TIMELINE
+#warning Using singlebuffered timeline window. This may cause flicker and makes the cursors invisible.
+#define redraw_overlay()
+#endif
+
 
 
 bool Timeline::draw_with_measure_lines = true;

Timeline/Timeline.H

@@ -51,18 +51,11 @@ class Scalebar;
 class Sequence;
 class Sequence_Widget;
 
-// disables double-buffering to make unnecessary redrawing more apparent
+#ifndef USE_SINGLEBUFFERED_TIMELINE
-// #define DEBUG_TIMELINE_DRAWING
-
-#ifndef DEBUG_TIMELINE_DRAWING
-
 #include <Fl/Fl_Overlay_Window.H>
-
 #else
-
 #include <FL/Fl_Single_Window.H>
 #define Fl_Overlay_Window Fl_Single_Window
-#define redraw_overlay()
 #endif
 
 struct position_info;

configure

@@ -13,7 +13,11 @@ ask "Installation prefix" prefix /usr/local
 ask "Use the LASH Audio Session Handler" USE_LASH yes
 ask "Build for debugging" USE_DEBUG no
 
-using DEBUG && ask "Use unoptimized drawing routines" USE_UNOPTIMIZED_DRAWING no
+using DEBUG && 
+{ 
+    ask "Use unoptimized drawing routines" USE_UNOPTIMIZED_DRAWING no
+    ask "Use singlebuffered timeline" USE_SINGLEBUFFERED_TIMELINE no
+}
 
 begin_tests