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ctm: initialize from MediaBox, if found

--- a/op.c

+++ b/op.c

@@ -1193,14 +1193,26 @@

 }

 void

+ctminit(Page *p, double *ctm)

+{

+	Object *mediabox;

+	double mx, my;

+	matidentity(ctm);

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

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

+		return;

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

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

+	ctm[0] = 850 / mx;

+	ctm[3] = 1100 / my;

+}

+

+void

 gsinit(Page *p, GS *gs)

 {

 	USED(p);

 	/* todo: actually initialize the full state */

-	/* CTM maps user coords to device coords. 

-	TODO: use mediabox and screen info to init CTM

-	*/

-	matidentity(gs->CTM);

+	ctminit(p, gs->CTM);

 	gs->LW = 1;

 	gs->LC = 0;

 	gs->LJ = 0;