shithub: vcrop

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fix transparent images artefacts when cropped

	we were using DNofill instead of DTransparent as the cropped image
	background which lead to display artefacts.
	Also use the source image chan type instead of the screen one to be
	sure we keep the same configuration between the source and the
	cropped image.

--- a/vcrop.c

+++ b/vcrop.c

@@ -58,7 +58,7 @@

 	if(o.y < n->r.min.y) o.y = n->r.min.y;

 	if((o.x + Dx(r)) > n->r.max.x) r.max.x = r.min.x + n->r.max.x - o.x;

 	if((o.y + Dy(r)) > n->r.max.y) r.max.y = r.min.y + n->r.max.y - o.y;

-	i = allocimage(display, r, screen->chan, 0, DNofill);

+	i = allocimage(display, r, n->chan, 0, DTransparent);

 	if(i==nil)

 		sysfatal("allocimage: %r");

 	draw(i, i->r, n, nil, o);