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ctm: initialize with CropBox info, not MediaBox

--- a/op.c

+++ b/op.c

@@ -1214,14 +1214,13 @@

 void

 ctminit(Page *p, double *ctm)

 {

-	Object *mediabox;

+	Object *cropbox;

 	double mx, my;

 	matidentity(ctm);

-	/* TODO: check if it's legal for MediaBox to be absent */

-	if((mediabox = dictget(p->obj, "MediaBox")) == nil)

+	if((cropbox = dictget(p->obj, "CropBox")) == nil)

 		return;

-	mx = arrayget(mediabox, 2)->num.d;

-	my = arrayget(mediabox, 3)->num.d;

+	mx = arrayget(cropbox, 2)->num.d;

+	my = arrayget(cropbox, 3)->num.d;

 	ctm[0] = 850 / mx;

 	ctm[3] = 1100 / my;

 }