/usr/share/common-lisp/source/mcclim/Extensions/Bitmap-formats/gif.lisp is in cl-mcclim 0.9.6.dfsg.cvs20100315-2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 | ;;; -*- Mode: Lisp; Package: MCCLIM-IMAGES -*-
;;; (c) copyright 2008 by
;;; Troels Henriksen (athas@sigkill.dk)
;;; This library is free software; you can redistribute it and/or
;;; modify it under the terms of the GNU Library General Public
;;; License as published by the Free Software Foundation; either
;;; version 2 of the License, or (at your option) any later version.
;;;
;;; This library is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;; Library General Public License for more details.
;;;
;;; You should have received a copy of the GNU Library General Public
;;; License along with this library; if not, write to the
;;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;;; Boston, MA 02111-1307 USA.
(in-package :clim-internals)
(define-bitmap-file-reader :gif (image-pathname)
(let* ((data-stream (skippy:load-data-stream image-pathname))
(first-image (aref (skippy:images data-stream) 0))
(image-height (skippy:height first-image))
(image-width (skippy:width first-image))
(pattern-array (make-array (list image-height image-width)))
(designs (coerce (loop with color-table = (skippy:color-table data-stream)
with transparency-index = (skippy:transparency-index first-image)
for i below (skippy:color-table-size color-table)
when (and transparency-index (= i transparency-index))
collect +transparent-ink+
else collect
(multiple-value-bind (r g b)
(skippy:color-rgb (skippy:color-table-entry color-table i))
(make-rgb-color (/ r 255) (/ g 255) (/ b 255))))
'vector)))
(dotimes (y image-height)
(dotimes (x image-width)
(setf (aref pattern-array y x) (skippy:pixel-ref first-image x y))))
(values pattern-array designs)))
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