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;;; -*- Mode:Lisp; Package:XLIB; Syntax:COMMON-LISP; Base:10; Lowercase:T -*-
;;; CLX interface for Bezier Spline Extension.
;;;
;;; TEXAS INSTRUMENTS INCORPORATED
;;; P.O. BOX 2909
;;; AUSTIN, TEXAS 78769
;;;
;;; Copyright (C) 1987 Texas Instruments Incorporated.
;;;
;;; Permission is granted to any individual or institution to use, copy, modify,
;;; and distribute this software, provided that this complete copyright and
;;; permission notice is maintained, intact, in all copies and supporting
;;; documentation.
;;;
;;; Texas Instruments Incorporated provides this software "as is" without
;;; express or implied warranty.
;;;
(in-package :xlib)
(export 'draw-curves)
(define-extension "bezier")
(defun draw-curves (drawable gcontext points)
;; Draw Bezier splines on drawable using gcontext.
;; Points are a list of (x0 y0 x1 y1 x2 y2 x3 y3)
(declare (type drawable drawable)
(type gcontext gcontext)
(type sequence points))
(let* ((display (drawable-display drawable))
(opcode (extension-opcode display "bezier")))
(with-buffer-request (display opcode :gc-force gcontext)
((data card8) 1) ;; X_PolyBezier - The minor_opcode for PolyBezier
(drawable drawable)
(gcontext gcontext)
((sequence :format int16) points))))
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