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libdraw: remove image area limit from badrect(2)

--- a/sys/src/libdraw/badrect.c

+++ b/sys/src/libdraw/badrect.c

@@ -15,7 +15,7 @@

 	y = Dy(r);

 	if(x > 0 && y > 0){

 		z = x*y;

-		if(z/x == y && z < 0x10000000)

+		if(z/x == y)

 			return 0;

 	}

 	return 1;

--- a/sys/src/libdraw/eenter.c

+++ b/sys/src/libdraw/eenter.c

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

 extern int genenter(char *ask, char *buf, int len, Mouse *m, void *kc, int (*_input)(Mouse*, void*, Rune*), Screen *scr);

 static int

-_input(Mouse *m, void *kc, Rune *k)

+_input(Mouse *m, void *, Rune *k)

 {

 	Event ev;

--- a/sys/src/libdraw/loadimage.c

+++ b/sys/src/libdraw/loadimage.c

@@ -30,7 +30,7 @@

 			dy = chunk/bpl;

 		if(dy <= 0){

 			dy = 1;

-			dx = ((chunk*dx)/bpl) & ~7;

+			dx = (((vlong)chunk*dx)/bpl) & ~7;

 			n = bytesperline(Rect(r.min.x, r.min.y, r.min.x+dx, r.min.y+dy), i->depth);

 			if(loadimage(i, Rect(r.min.x+dx, r.min.y, r.max.x, r.min.y+dy), data+n, bpl-n) < 0)

 				return -1;

-- 

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