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gs: implement color space setting

--- a/op.c

+++ b/op.c

@@ -339,10 +339,50 @@

 	return 0;

 }

+char *colorspacedevices[] = {"DeviceGray", "DeviceRGB", "DeviceCMYK"};

+ColorSpace colorspacechans[] = {

+	[1] = DeviceGray,

+	[3] = DeviceRGB,

+	[4] = DeviceCMYK,

+};

+

 static int

+iccbasedcspace(Object *icc, ColorSpace *c)

+{

+	Object *o;

+	*c = colorspacechans[dictint(icc, "N")];

+	if((o = dictget(icc, "Alternate")) != &null){

+		if(*c > 2 || strcmp(colorspacedevices[*c], o->name) != 0){

+			werrstr("ICCBased cspace: TODO: handle non-device alternate '%s'", o->name);

+			return 0;

+		}

+	}

+	return 1;

+}

+

+static int

 cspace(Op *op, Page *p)

 {

-	USED(op, p);

+	ColorSpace *c = (op->flags & Nonstroking) ? &p->GSactive->NSCS : &p->GSactive->SCS;

+	char *s = arrayget(p->stack, 0)->name;

+	Object *o;

+	int i;

+	for(i = 0; i < 3; i += 1)

+		if(strcmp(s, colorspacedevices[i]) == 0){

+			*c = i;

+			return 1;

+		}

+	if((o = dictget(dictget(p->obj, "Resources"), "ColorSpace")) == &null

+		|| (o = dictget(o, s)) == &null){

+		werrstr("colorspace '%s' not found", s);

+		return 0;

+	}

+	if(strcmp(arrayget(o, 0)->name, "ICCBased") == 0){

+		/* Don't support ICC; fall back to Alternate or default */

+		o = arrayget(o, 1);

+		return iccbasedcspace(o, c);

+	}

+	werrstr("cspace: TODO: %s color space", arrayget(o, 0)->name);

 	return 0;

 }