X-Git-Url: https://git.artsoft.org/?a=blobdiff_plain;f=src%2Flibgame%2Fsystem.h;h=11670c698785428a14fad8d5844908f03e6a0c45;hb=80aa0e4b2b060112407417a9d2896395023a21cc;hp=df95c9d336ff7ed064fb095c09572b5149b947b0;hpb=0c6144aa1196e8121ba38716f9f95836d0ccbb9e;p=rocksndiamonds.git

diff --git a/src/libgame/system.h b/src/libgame/system.h
index df95c9d3..11670c69 100644
--- a/src/libgame/system.h
+++ b/src/libgame/system.h
@@ -285,7 +285,18 @@
 				 REDRAW_TILES | \
 				 REDRAW_MICROLEVEL)
 #define REDRAW_FPS		(1 << 11)
+
+#if defined(TARGET_X11)
+/* on old-style, classic and potentially slow graphics systems, redraw single
+   tiles instead of the whole playfield unless a certain threshold is reached;
+   when using the X11 target, this method should still be fast on all systems */
 #define REDRAWTILES_THRESHOLD	(SCR_FIELDX * SCR_FIELDY / 2)
+#else
+/* on modern graphics systems and when using the SDL target, this tile redraw
+   optimization can slow things down a lot due to many small blits compared to
+   one single playfield-sized blit (especially observed on Mac OS X with SDL) */
+#define REDRAWTILES_THRESHOLD	0
+#endif
 
 #define IN_GFX_SCREEN(x, y)	(x >= gfx.sx && x < gfx.sx + gfx.sxsize && \
 				 y >= gfx.sy && y < gfx.sy + gfx.sysize)