2 ;;; Copyright (c) 2007 Zachary Beane, All Rights Reserved
4 ;;; Redistribution and use in source and binary forms, with or without
5 ;;; modification, are permitted provided that the following conditions
8 ;;; * Redistributions of source code must retain the above copyright
9 ;;; notice, this list of conditions and the following disclaimer.
11 ;;; * Redistributions in binary form must reproduce the above
12 ;;; copyright notice, this list of conditions and the following
13 ;;; disclaimer in the documentation and/or other materials
14 ;;; provided with the distribution.
16 ;;; THIS SOFTWARE IS PROVIDED BY THE AUTHOR 'AS IS' AND ANY EXPRESSED
17 ;;; OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 ;;; WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 ;;; ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
20 ;;; DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 ;;; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
22 ;;; GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 ;;; INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 ;;; WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
25 ;;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
26 ;;; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 (:grayscale-alpha .
4)
36 (:truecolor-alpha .
6)))
38 (defvar *png-signature
*
40 :element-type
'(unsigned-byte 8)
41 :initial-contents
'(137 80 78 71 13 10 26 10)))
43 (defconstant +png-compression-method
+ 0)
44 (defconstant +png-filtering
+ 0)
45 (defconstant +png-interlace
+ 0)