issue #364, clip window support

csrc/u8g2.h

@@ -89,7 +89,7 @@
   Setting a clip window will restrict all drawing to this window.
   Clip window support requires about 200 bytes flash memory on AVR systems
 */
-//#define U8G2_WITH_CLIP_WINDOW_SUPPORT
+#define U8G2_WITH_CLIP_WINDOW_SUPPORT
 
 
 /*

sys/utf8/clip_test_picture_loop/main.c

@@ -48,6 +48,9 @@ int main(void)
   
   u8g2_SetFontDirection(&u8g2, 0);
   
+  u8g2_SetClipWindow(&u8g2, 10, 10, 50, 60 );
+  
+  
   u8g2_SetDisplayRotation(&u8g2, U8G2_R0);  
   u8g2_FirstPage(&u8g2);
   do