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;;; 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.
;;;
;;; Interface functions for creating, initializing, and closing a
;;; FONT-LOADER object.
;;;
;;; $Id: font-loader-interface.lisp,v 1.6 2006/03/23 22:20:35 xach Exp $
(in-package #:zpb-ttf)
(defun arrange-finalization (object stream)
(flet ((quietly-close (&optional object)
(declare (ignore object))
(ignore-errors (close stream))))
#+sbcl
(sb-ext:finalize object #'quietly-close)
#+cmucl
(ext:finalize object #'quietly-close)
#+clisp
(ext:finalize object #'quietly-close)
#+allegro
(excl:schedule-finalization object #'quietly-close)))
(defun check-magic (magic &rest ok)
(cond
((member magic ok)
t)
((= magic (tag->number "typ1"))
(error 'unsupported-format
:location "font header"
:description "Old style of PostScript font housed in a sfnt wrapper not supported."
:actual-value magic
:expected-values ok))
((= magic (tag->number "OTTO"))
(error 'unsupported-format
:location "font header"
:description "OpenType font with PostScript outlines not supported."
:actual-value magic
:expected-values ok))
(t
(error 'bad-magic
:location "font header"
:expected-values ok
:actual-value magic))))
;;;
;;; FIXME: move most/all of this stuff into initialize-instance
;;;
(defun open-font-loader-from-stream (input-stream &key (collection-index 0))
(let ((magic (read-uint32 input-stream))
(font-count))
(check-magic magic #x00010000
(tag->number "true")
(tag->number "ttcf"))
(when (= magic (tag->number "ttcf"))
(let ((version (read-uint32 input-stream)))
(check-version "ttc header" version #x00010000 #x00020000)
(setf font-count (read-uint32 input-stream))
(let* ((offset-table (make-array font-count))
(dsig))
(when (> collection-index font-count)
(error 'unsupported-value
:description "Font index out of range"
:actual-value collection-index
:expected-values (list font-count)))
(loop for i below font-count
do (setf (aref offset-table i) (read-uint32 input-stream)))
(when (= version #x00020000)
(let ((flag (read-uint32 input-stream))
(length (read-uint32 input-stream))
(offset (read-uint32 input-stream)))
(list flag length offset)
(when (= #x44534947 flag)
(setf dsig (list length offset)))))
;; seek to font offset table
(file-position input-stream (aref offset-table collection-index))
(let ((magic2 (read-uint32 input-stream)))
(check-magic magic2 #x00010000 (tag->number "true"))))))
(let* ((table-count (read-uint16 input-stream))
(font-loader (make-instance 'font-loader
:input-stream input-stream
:table-count table-count
:collection-font-cont font-count
:collection-font-index
(when font-count
collection-index))))
;; skip the unused stuff:
;; searchRange, entrySelector, rangeShift
(read-uint16 input-stream)
(read-uint16 input-stream)
(read-uint16 input-stream)
(loop repeat table-count
for tag = (read-uint32 input-stream)
for checksum = (read-uint32 input-stream)
for offset = (read-uint32 input-stream)
for size = (read-uint32 input-stream)
do (setf (gethash tag (tables font-loader))
(make-instance 'table-info
:offset offset
:name (number->tag tag)
:size size)))
(load-maxp-info font-loader)
(load-head-info font-loader)
(load-kern-info font-loader)
(load-loca-info font-loader)
(load-name-info font-loader)
(load-cmap-info font-loader)
(load-post-info font-loader)
(load-hhea-info font-loader)
(load-hmtx-info font-loader)
(load-vhea-info font-loader)
(load-vmtx-info font-loader)
(setf (glyph-cache font-loader)
(make-array (glyph-count font-loader) :initial-element nil))
font-loader)))
(defun open-font-loader-from-file (thing &key (collection-index 0))
(let ((stream (open thing
:direction :input
:element-type '(unsigned-byte 8)
#+ccl :sharing #+ccl :external)))
(let ((font-loader (open-font-loader-from-stream
stream :collection-index collection-index)))
(arrange-finalization font-loader stream)
font-loader)))
(defun open-font-loader (thing &key (collection-index 0))
(typecase thing
(font-loader
(cond
;; We either don't have a collection, or want same font from
;; collection.
((or (not (collection-font-index thing))
(= collection-index (collection-font-index thing)))
(unless (open-stream-p (input-stream thing))
(setf (input-stream thing) (open (input-stream thing))))
thing)
(t
(open-font-loader-from-file (input-stream thing)
:collection-index collection-index))))
(stream
(if (open-stream-p thing)
(open-font-loader-from-stream thing :collection-index collection-index)
(error "~A is not an open stream" thing)))
(t
(open-font-loader-from-file thing :collection-index collection-index))))
(defun close-font-loader (loader)
(close (input-stream loader)))
(defmacro with-font-loader ((loader file &key (collection-index 0)) &body body)
`(let (,loader)
(unwind-protect
(progn
(setf ,loader (open-font-loader ,file
:collection-index ,collection-index))
,@body)
(when ,loader
(close-font-loader ,loader)))))
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