Make optimized drawing of timeline canvas a compile-time option.

Makefile

@@ -52,6 +52,11 @@ else
 	CXXFLAGS := -fno-rtti -fno-exceptions
 endif
 
+
+ifeq ($(USE_UNOPTIMIZED_DRAWING),yes)
+	CFLAGS+=-DUSE_UNOPTIMIZED_DRAWING
+endif
+
 CFLAGS+=-DVERSION=\"$(VERSION)\" \
 	-DINSTALL_PREFIX=\"$(prefix)\" \
 	-DSYSTEM_PATH=\"$(SYSTEM_PATH)\" \

Timeline/Timeline.C

@@ -896,7 +896,11 @@ Timeline::draw ( void )
 
     adjust_vscroll();
 
+#ifndef USE_UNOPTIMIZED_DRAWING
     if ( ( damage() & FL_DAMAGE_ALL ) || ( damage() & FL_DAMAGE_EXPOSE ) )
+#else
+    #warning Optimized drawing of timeline disabled. This will waste your CPU.
+#endif
     {
         DMESSAGE( "complete redraw" );
 

configure

@@ -13,6 +13,8 @@ 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
+
 begin_tests
 
 require_FLTK 1.1.7 images