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-rw-r--r--docs/release/src/emu/digfx.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/docs/release/src/emu/digfx.h b/docs/release/src/emu/digfx.h
index 5b77ca691a5..7359aa4d340 100644
--- a/docs/release/src/emu/digfx.h
+++ b/docs/release/src/emu/digfx.h
@@ -72,7 +72,8 @@ const gfx_layout name = { width, height, RGN_FRAC(1,1), 8, { GFX_RAW }, { 0 }, {
#define STEP1024(START,STEP) STEP512(START,STEP),STEP512((START)+512*(STEP),STEP)
#define STEP2048(START,STEP) STEP1024(START,STEP),STEP1024((START)+1024*(STEP),STEP)
-
+#define STEP2_INV(START,STEP) (START)+(STEP),(START)
+#define STEP4_INV(START,STEP) STEP2_INV(START+2*STEP,STEP),STEP2_INV(START,STEP)
//**************************************************************************
// GRAPHICS INFO MACROS