From http://www.jwz.org/xscreensaver/xscreensaver-5.27.tar.gz

[xscreensaver] / OSX / XScreenSaverView.h

diff --git a/OSX/XScreenSaverView.h b/OSX/XScreenSaverView.h
index ffb9327dbf2e5fc6cad291e35e5b77a4d8b3e085..5ca2fb8b49137106df4f0d84cc247b0159b94381 100644 (file)
--- a/OSX/XScreenSaverView.h
+++ b/OSX/XScreenSaverView.h
@@ -53,7 +53,10 @@
 
 
 #define USE_BACKBUFFER  // must be in sync with jwxyz.m
-#define USE_CALAYER     // requires USE_BACKBUFFER; required by iOS.
+
+// If USE_BACKBUFFER is enabled, one of these must also be enabled.
+// #define BACKBUFFER_CGCONTEXT   // Not supported by iOS.
+#define BACKBUFFER_CALAYER
 
 @interface XScreenSaverView : ScreenSaverView
 # ifdef USE_IPHONE
@@ -102,7 +105,7 @@
   CGSize backbuffer_size;
   CGColorSpaceRef colorspace;
 
-#  ifndef USE_CALAYER
+#  ifdef BACKBUFFER_CGCONTEXT
   CGContextRef window_ctx;
 #  endif