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gs: implement RGB color support

--- a/op.c

+++ b/op.c

@@ -394,7 +394,12 @@

 static int

 ccolour(Op *op, Page *p)

 {

-	USED(op, p);

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

+	u32int *color = op->flags & Nonstroking ? &p->GSactive->NSC : &p->GSactive->SC;

+	if(c == DeviceRGB){

+		*color = ((u8int)(255 * arrayget(p->stack, 0)->num.d)) << 24 | ((u8int)(255 * arrayget(p->stack, 1)->num.d)) << 16 | ((u8int)(255 * arrayget(p->stack, 2)->num.d)) << 8 | 0xff;

+		return 1;

+	}

 	return 0;

 }

@@ -404,7 +409,6 @@

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

 	if(c < 3)

 		return ccolour(op, p);

-	USED(op, p);

 	return 0;

 }

@@ -752,6 +756,7 @@

 {

 	double Tfs = p->GSactive->Font.size;

 	double Trm[6];

+	Memimage *ink;

 	double tx;

 	int i;

 	/* Text rendering matrix converts coordinates from font space to device space */

@@ -774,8 +779,18 @@

 		werrstr("tchar: failed to write character: %r");

  		return 0;

 	}

-	if(p->buf.b != nil)

-		memimagestring(p->image, Pt(Trm[4], Trm[5]), memblack, Pt(0,0), getmemdefont(), (char*)p->buf.b + oend);

+	if(p->buf.b != nil){

+		ink = allocmemimage(Rect(0,0,1,1),RGB24);

+		if(ink == nil){

+			werrstr("failed to allocate ink");

+			return 0;

+		}

+		ink->flags |= Frepl;

+		ink->clipr = Rect(-0x3FFFFFF, -0x3FFFFFF, 0x3FFFFFF, 0x3FFFFFF);

+		memfillcolor(ink, p->GSactive->NSC);

+		memimagestring(p->image, Pt(Trm[4], Trm[5]), ink, Pt(0,0), getmemdefont(), (char*)p->buf.b + oend);

+		freememimage(ink);

+	}

 	tx = glyphspacing(p, c);

 	mattrans(p->TS.Tm, tx, 0, p->TS.Tm);

 	p->TS.x = Trm[4] + tx;