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games/md: fix interlace at scale 2

--- a/sys/src/games/md/md.c

+++ b/sys/src/games/md/md.c

@@ -131,10 +131,11 @@

 void

 screenproc(void *)

 {

-	extern u8int pic[320*224*4*3];

+	extern u8int pic[320*224*4*4];

+	extern int intla;

 	Rectangle r;

 	uchar *s;

-	int w;

+	int w, h;

 	enum { AMOUSE, ARESIZE, AFLUSH, AEND };

 	Alt a[AEND+1] = {

@@ -159,10 +160,13 @@

 				s = pic;

 				r = picr;

 				w = 320*4*scale;

+				h = scale;

+				if(intla && (h & 1) == 0)

+					h >>= 1;

 				while(r.min.y < picr.max.y){

 					loadimage(tmp, tmp->r, s, w);

 					s += w;

-					r.max.y = r.min.y+scale;

+					r.max.y = r.min.y+h;

 					draw(screen, r, tmp, nil, ZP);

 					r.min.y = r.max.y;

 				}

--- a/sys/src/games/md/vdp.c

+++ b/sys/src/games/md/vdp.c

@@ -4,7 +4,7 @@

 #include "dat.h"

 #include "fns.h"

-u8int pic[320*224*4*3];

+u8int pic[320*224*4*4];

 u16int vdpstat = 0x3400;

 int vdpx, vdpy, vdpyy, frame, intla;

 u16int hctr;

-- 

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