/usr/share/common-lisp/source/zpb-ttf/kern.lisp is in cl-zpb-ttf 0.7-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 | ;;; Copyright (c) 2006 Zachary Beane, All Rights Reserved
;;;
;;; Redistribution and use in source and binary forms, with or without
;;; modification, are permitted provided that the following conditions
;;; are met:
;;;
;;; * Redistributions of source code must retain the above copyright
;;; notice, this list of conditions and the following disclaimer.
;;;
;;; * Redistributions in binary form must reproduce the above
;;; copyright notice, this list of conditions and the following
;;; disclaimer in the documentation and/or other materials
;;; provided with the distribution.
;;;
;;; THIS SOFTWARE IS PROVIDED BY THE AUTHOR 'AS IS' AND ANY EXPRESSED
;;; OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
;;; WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
;;; ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
;;; DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
;;; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
;;; GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
;;; INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
;;; WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
;;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
;;; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;;;
;;; "kern" table functions
;;;
;;; http://www.microsoft.com/OpenType/OTSpec/kern.htm
;;; http://developer.apple.com/fonts/TTRefMan/RM06/Chap6kern.html
;;;
;;; kern.lisp,v 1.8 2006/03/28 14:38:37 xach Exp
(in-package #:zpb-ttf)
(defun load-kerning-format-1 (table stream)
"Return a hash table keyed on a UINT32 key that represents the glyph
index in the left and right halves with a value of the kerning
distance between the pair."
(let ((pair-count (read-uint16 stream))
(search-range (read-uint16 stream))
(entry-selector (read-uint16 stream))
(range-shift (read-uint16 stream)))
(declare (ignore search-range entry-selector range-shift))
(dotimes (i pair-count)
(setf (gethash (read-uint32 stream) table)
(read-int16 stream)))))
(defmethod load-kerning-subtable ((font-loader font-loader) format)
(when (/= 1 format)
(error 'unsupported-format
:description "kerning subtable"
:size 1
:expected-values (list 1)
:actual-value format))
(load-kerning-format-1 (kerning-table font-loader)
(input-stream font-loader)))
(defmethod load-kern-info ((font-loader font-loader))
(when (table-exists-p "kern" font-loader)
(seek-to-table "kern" font-loader)
(let* ((stream (input-stream font-loader))
(maybe-version (read-uint16 stream))
(maybe-table-count (read-uint16 stream))
(version 0)
(table-count 0))
;; These shenanegins are because Apple documents one style of
;; kern table and Microsoft documents another. This code
;; implements Microsoft's version.
;; See:
;; http://developer.apple.com/fonts/TTRefMan/RM06/Chap6kern.html
;; http://www.microsoft.com/OpenType/OTSpec/kern.htm
(if (zerop version)
(setf version maybe-version
table-count maybe-table-count)
(setf version (logand (ash maybe-version 16) maybe-table-count)
table-count (read-uint32 stream)))
(check-version "\"kern\" table" version 0)
(dotimes (i table-count)
(let ((version (read-uint16 stream))
(length (read-uint16 stream))
(coverage-flags (read-uint8 stream))
(format (read-uint8 stream)))
(declare (ignore version length coverage-flags))
(load-kerning-subtable font-loader format))))))
(defmethod all-kerning-pairs ((font-loader font-loader))
(let ((pairs nil))
(maphash (lambda (k v)
(let* ((left-index (ldb (byte 16 16) k))
(right-index (ldb (byte 16 0) k))
(left (index-glyph left-index font-loader))
(right (index-glyph right-index font-loader)))
(push (list left right v) pairs)))
(kerning-table font-loader))
pairs))
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