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ctm: CropBox defaults to MediaBox

--- a/op.c

+++ b/op.c

@@ -1361,6 +1361,15 @@

 	page->TS.y = 0;

 }

+Object*

+pagecropbox(Page *p)

+{

+	Object *o = dictget(p->obj, "CropBox");

+	if(o == &null)

+		o = dictget(p->obj, "MediaBox");

+	return o;

+}

+

 void

 ctminit(Page *p, double *ctm)

 {

@@ -1367,8 +1376,7 @@

 	Object *cropbox;

 	double mx, my;

 	matidentity(ctm);

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

-		return;

+	cropbox = pagecropbox(p);

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

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

 	ctm[0] = 850 / mx;