-;; As an excercise, do it with records.
-;; Should use GOOPS, really.
+;;;; font.scm -- construct font trees
+;;;;
+;;;; source file of the GNU LilyPond music typesetter
+;;;;
+;;;; (c) 2004--2008 Han-Wen Nienhuys <hanwen@xs4all.nl>
;; TODO:
;;
;; lookup-font should be written in C.
;;
-;; should dump tree to .texi as internal documentation
-;;
-;; * should extract design sizes from fonts.
-(define font-tree-record
- (make-record-type
- "font-tree-node"
- '(qualifier default children)))
+(define-class <Font-tree-element>
+ ())
-(define-public font-tree-node?
- (record-predicate font-tree-record))
-(define-public font-tree-default
- (record-accessor font-tree-record 'default))
-(define-public font-tree-qualifier
- (record-accessor font-tree-record 'qualifier))
-(define-public font-tree-children
- (record-accessor font-tree-record 'children))
+(define-class <Font-tree-leaf> (<Font-tree-element>)
+ (default-size #:init-keyword #:default-size)
+ (size-vector #:init-keyword #:size-vector))
+(define-class <Font-tree-node> (<Font-tree-element>)
+ (qualifier #:init-keyword #:qualifier #:accessor font-qualifier)
+ (default #:init-keyword #:default #:accessor font-default)
+ (children #:init-keyword #:children #:accessor font-children))
+
+(define (make-font-tree-leaf size size-font-vector)
+ (make <Font-tree-leaf> #:default-size size #:size-vector size-font-vector))
(define (make-font-tree-node
qualifier default)
- ((record-constructor font-tree-record)
- qualifier
- default
- (make-hash-table 11))) ;ugh. hardcoded.
+ (make <Font-tree-node>
+ #:qualifier qualifier
+ #:default default
+ #:children (make-hash-table 11)))
+
+(define-method (display (leaf <Font-tree-leaf>) port)
+ (map (lambda (x) (display x port))
+ (list
+ "#<Font-size-family:\n"
+ (slot-ref leaf 'default-size)
+ (slot-ref leaf 'size-vector)
+ "#>"
+ )))
+
+(define-method (display (node <Font-tree-node>) port)
+ (map
+ (lambda (x)
+ (display x port))
+ (list
+ "Font_node {\nqual: "
+ (font-qualifier node)
+ "(def: "
+ (font-default node)
+ ") {\n"))
+ (for-each
+ (lambda (x)
+ (display "\n")
+ (display (car x) port)
+ (display "=" port)
+ (display (cdr x) port))
+ (hash-table->alist (font-children node)))
+ (display "} }\n"))
(define default-qualifier-order
'(font-encoding font-family font-shape font-series))
-
-(define-public (add-font node fprops size-family)
+(define-method (add-font (node <Font-tree-node>) fprops size-family)
(define (assoc-delete key alist)
(assoc-remove! (list-copy alist) key))
+
(define (make-node fprops size-family)
(if (null? fprops)
- size-family
- (let*
- ((qual (next-qualifier default-qualifier-order fprops)))
+ (make-font-tree-leaf (car size-family) (cdr size-family))
+ (let* ((qual (next-qualifier default-qualifier-order fprops)))
(make-font-tree-node qual
- (assoc-get qual fprops)))
- ))
+ (assoc-get qual fprops)))))
+
(define (next-qualifier order props)
(cond
((and (null? props) (null? order))
(else
(if (assoc-get (car order) props)
(car order)
- (next-qualifier (cdr order) props))
- )))
-
- (if (font-tree-node? node)
- (let*
- ((q (font-tree-qualifier node))
- (d (font-tree-default node))
- (v (assoc-get q fprops d))
- (new-fprops (assoc-delete q fprops))
- (child (hashq-ref (font-tree-children node)
- v #f)))
-
-
- (if (not child)
- (begin
- (set! child (make-node new-fprops size-family))
- (hashq-set! (font-tree-children node) v child)))
-
- (add-font child new-fprops size-family))
- (if (not (equal? size-family node))
- (throw 'invalid-font props size-family)))
- )
-
-(define-public (display-font-node node . rest)
- (let*
- ((port (if (pair? rest) (car rest) (current-output-port)))
- )
- (cond
- ((font-tree-node? node)
- (map
- (lambda (x)
- (display x port))
-
- (list
- "Font_node { \nqual: "
- (font-tree-qualifier node)
- "(def: "
- (font-tree-default node)
- ") {\n"))
- (for-each
- (lambda (x)
- (display "\n")
- (display (car x) port)
- (display "=" port)
- (display-font-node (cdr x) port))
- (hash-table->alist (font-tree-children node)))
- (display "} } \n"))
-
- (else
- (display node port))))
- )
-
-(define-public (lookup-font node alist-chain)
- (cond
- ((font-tree-node? node)
- (let*
- ((qual (font-tree-qualifier node))
- (def (font-tree-default node))
+ (next-qualifier (cdr order) props)))))
+
+ (let* ((q (font-qualifier node))
+ (d (font-default node))
+ (v (assoc-get q fprops d))
+ (new-fprops (assoc-delete q fprops))
+ (child (hashq-ref (slot-ref node 'children)
+ v #f)))
+ (if (not child)
+ (begin
+ (set! child (make-node new-fprops size-family))
+ (hashq-set! (slot-ref node 'children) v child)))
+ (if (pair? new-fprops)
+ (add-font child new-fprops size-family))))
+
+(define-method (add-font (node <Font-tree-leaf>) fprops size-family)
+ (throw "must add to node, not leaf"))
+
+(define-method (g-lookup-font (node <Font-tree-node>) alist-chain)
+ (let* ((qual (font-qualifier node))
+ (def (font-default node))
(val (chain-assoc-get qual alist-chain def))
- (desired-font (lookup-font
- (hashq-ref (font-tree-children node)
- val) alist-chain))
- (font (if desired-font
- desired-font
- (lookup-font (hashq-ref (font-tree-children node)
- def) alist-chain)))
- )
- font))
- (else node)))
-
-(define-public (make-font-tree factor)
- (let*
- ((n (make-font-tree-node 'font-encoding 'music))
- )
-
- (for-each
- (lambda (x)
- (add-font n
- (list (cons 'font-encoding (car x)))
- (cons (* factor (cadr x))
- (caddr x))))
- '((number 10
- #((3.82 . "feta-nummer4")
- (5.5 . "feta-nummer6")
- (8.0 . "feta-nummer8")
- (10.0 . "feta-nummer10")
- (12.0 . "feta-nummer12")
- (16.0 . "feta-nummer16")))
- (dynamic 14.0 #((6.0 . "feta-din6")
- (8.0 . "feta-din8")
- (10.0 . "feta-din10")
- (12.0 . "feta-din12")
- (14.0 . "feta-din14")
- (17.0 . "feta-din17")
- ))
- (math 10 #((10.0 . "msam10")))
- (music 20.0
- #((11.22 . ("feta11" "parmesan11"))
- (12.60 . ("feta13" "parmesan13"))
- (14.14 . ("feta14" "parmesan14"))
- (15.87 . ("feta16" "parmesan16"))
- (17.82 . ("feta18" "parmesan18"))
- (20.0 . ("feta20" "parmesan20"))
- (22.45 . ("feta23" "parmesan23"))
- (25.20 . ("feta26" "parmesan26"))
- ))
- (braces 10 #((10.0 . ("feta-braces00"
- "feta-braces10"
- "feta-braces20"
- "feta-braces30"
- "feta-braces40"
- "feta-braces50"
- "feta-braces60"
- "feta-braces70"
- "feta-braces80"))
- ))))
-
- (for-each
- (lambda (x)
- (add-font
- n
- `((font-encoding . text)
- (font-series . ,(vector-ref (car x) 2))
- (font-shape . ,(vector-ref (car x) 1))
- (font-family . ,(vector-ref (car x) 0)))
- (cons (* factor (cadr x))
- (cddr x))
- ))
- '((#(roman upright medium) .
- (10.0 . #((6.0 . "cmr6")
- (8.0 . "cmr8")
- (10.0 . "cmr10")
- (17.0 . "cmr17")
- )))
-
- (#(roman upright bold) .
- (10.0 . #((6.0 . "cmbx6")
- (8.0 . "cmbx8")
- (10.0 . "cmbx10")
- (12.0 . "cmbx12")
- )))
-
- (#(roman italic medium) .
- (10.0 . #((7.0 . "cmti7")
- (10.0 . "cmti10")
- (12.0 . "cmti12")
- )))
- (#(roman italic bold) .
- (10.0 . #((8.0 . "cmbxti8")
- (10.0 . "cmbxti10")
- (14.0 . "cmbxti14")
- )))
-
- (#(roman caps medium) .
- (10.0 . #((10.0 . "cmcsc10"))))
-
- (#(roman upright bold-narrow ) .
- (10.0 . #((10.0 . "cmb10")
- )))
-
- (#(sans upright medium) .
- (10.0 . #((8.0 . "cmss8")
- (10.0 . "cmss10")
- (12.0 . "cmss12")
- (17.0 . "cmss17")
- )))
- (#(typewriter upright medium) .
- (10.0 . #((8.0 . "cmtt8")
- (10.0 . "cmtt10")
- (12.0 . "cmtt12")
- )))
- ))
+ (desired-child (hashq-ref (font-children node) val)))
+
+ (if desired-child
+ (g-lookup-font desired-child alist-chain)
+ (g-lookup-font (hashq-ref (font-children node) def) alist-chain))))
+
+(define-method (g-lookup-font (node <Font-tree-leaf>) alist-chain)
+ node)
+
+;; two step call is handy for debugging.
+(define (lookup-font node alist-chain)
+ (g-lookup-font node alist-chain))
+
+
+;; Ugh. Currently, we load the PFB Feta fonts for `fetaDynamic' with
+;; Pango. This should be changed to load the Emmentaler fonts instead
+;; (with Pango too), but then we need support for a `font-style'
+;; property which isn't implemented yet.
+(define feta-alphabet-size-vector
+ (list->vector
+ (map (lambda (tup)
+ (cons (ly:pt (cdr tup))
+ (format "feta-alphabet~a ~a"
+ (car tup)
+ (ly:pt (cdr tup)))))
+ '((11 . 11.22)
+ (13 . 12.60)
+ (14 . 14.14)
+ (16 . 15.87)
+ (18 . 17.82)
+ (20 . 20)
+ (23 . 22.45)
+ (26 . 25.20)))))
+
+;; Each size family is a vector of fonts, loaded with a delay. The
+;; vector should be sorted according to ascending design size.
+(define-public (add-music-fonts node factor)
+ (for-each
+ (lambda (x)
+ (add-font node
+ (list (cons 'font-encoding (car x)))
+ (cons (* factor (cadr x))
+ (caddr x))))
+ `((fetaDynamic ,(ly:pt 20.0) ,feta-alphabet-size-vector)
+ (fetaNumber ,(ly:pt 20.0) ,feta-alphabet-size-vector)
+ (fetaMusic ,(ly:pt 20.0)
+ #(,(delay (ly:system-font-load "emmentaler-11"))
+ ,(delay (ly:system-font-load "emmentaler-13"))
+ ,(delay (ly:system-font-load "emmentaler-14"))
+ ,(delay (ly:system-font-load "emmentaler-16"))
+ ,(delay (ly:system-font-load "emmentaler-18"))
+ ,(delay (ly:system-font-load "emmentaler-20"))
+ ,(delay (ly:system-font-load "emmentaler-23"))
+ ,(delay (ly:system-font-load "emmentaler-26"))))
+ (fetaBraces ,(ly:pt 20.0)
+ #(,(delay (ly:system-font-load "aybabtu")))))))
+
+(define-public (add-pango-fonts node lily-family family factor)
+ (define (add-node shape series)
+ (add-font node
+ `((font-family . ,lily-family)
+ (font-shape . ,shape)
+ (font-series . ,series)
+ (font-encoding . latin1) ;; ugh.
+ )
+ `(,(ly:pt (* factor 11.0))
+ . #(,(cons
+ (ly:pt 12)
+ (ly:make-pango-description-string
+ `(((font-family . ,family)
+ (font-series . ,series)
+ (font-shape . ,shape)))
+ (ly:pt 12)))))))
+
+ (add-node 'upright 'normal)
+ (add-node 'caps 'normal)
+ (add-node 'upright 'bold)
+ (add-node 'italic 'normal)
+ (add-node 'italic 'bold))
+
+(define-public (make-pango-font-tree roman-str sans-str typewrite-str factor)
+ (let ((n (make-font-tree-node 'font-encoding 'fetaMusic)))
+ (add-music-fonts n factor)
+ (add-pango-fonts n 'roman roman-str factor)
+ (add-pango-fonts n 'sans sans-str factor)
+ (add-pango-fonts n 'typewriter typewrite-str factor)
n))
-(define-public (magstep x)
- (exp (* (/ x 6) (log 2))))
+(define-public (make-century-schoolbook-tree factor)
+ (make-pango-font-tree
+ "Century Schoolbook L"
+ "Sans" "Mono" factor))
+
+(define-public (magstep s)
+ (exp (* (/ s 6) (log 2))))
+
+(define-public (magnification->font-size m)
+ (* 6 (/ (log m) (log 2))))
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