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page: fix draw performance problem on t23

--- a/sys/src/cmd/page.c

+++ b/sys/src/cmd/page.c

@@ -936,7 +936,7 @@

 	Point a;

 	if(f <= 1){

-		gendrawdiff(d, r, top, s, sp, nil, ZP, S);

+		gendrawdiff(d, r, top, s, sp, nil, ZP, SoverD);

 		return;

 	}

 	a = ZP;

@@ -966,7 +966,7 @@

 	}

 	sp = r.min;

 	for(x=r.min.x; x<r.max.x; x++){

-		gendrawdiff(d, Rect(x, r.min.y, x+1, r.max.y), top, t, sp, nil, ZP, S);

+		gendrawdiff(d, Rect(x, r.min.y, x+1, r.max.y), top, t, sp, nil, ZP, SoverD);

 		if(++a.x == f){

 			a.x = 0;

 			sp.x++;

@@ -1002,7 +1002,7 @@

 		r = rectaddpt(Rpt(ZP, pagesize(p)), addpt(pos, screen->r.min));

 		zoomdraw(screen, r, ZR, i, i->r.min, zoom);

 	}

-	gendrawdiff(screen, screen->r, r, background, ZP, nil, ZP, S);

+	gendrawdiff(screen, screen->r, r, background, ZP, nil, ZP, SoverD);

 	border(screen, r, -Borderwidth, display->black, ZP);

 	flushimage(display, 1);

 }

@@ -1023,7 +1023,7 @@

 	rectclip(&or, screen->r);

 	draw(screen, rectaddpt(or, d), screen, nil, or.min);

 	zoomdraw(screen, nr, rectaddpt(or, d), i, i->r.min, zoom);

-	gendrawdiff(screen, screen->r, nr, background, ZP, nil, ZP, S);

+	gendrawdiff(screen, screen->r, nr, background, ZP, nil, ZP, SoverD);

 	border(screen, nr, -Borderwidth, display->black, ZP);

 	flushimage(display, 1);

 }

-- 

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