|
|
#lang debug racket
|
|
|
(require xenomorph
|
|
|
"tables.rkt"
|
|
|
"struct.rkt"
|
|
|
(for-syntax "tables.rkt"))
|
|
|
(provide (all-defined-out))
|
|
|
|
|
|
(define-syntax (define-table-getters stx)
|
|
|
(syntax-case stx ()
|
|
|
[(_)
|
|
|
(with-syntax ([(TABLE-TAG ...) (hash-keys table-codecs)])
|
|
|
(with-syntax ([(GETTER-ID ...) (map (λ (tag) (datum->syntax stx (string->symbol (format "get-~a-table" (syntax->datum tag)))))
|
|
|
(syntax->list #'(TABLE-TAG ...)))]
|
|
|
[(HAS-ID? ...) (map (λ (tag) (datum->syntax stx (string->symbol (format "has-~a-table?" (syntax->datum tag)))))
|
|
|
(syntax->list #'(TABLE-TAG ...)))])
|
|
|
#'(begin
|
|
|
(define (GETTER-ID this) (get-table this 'TABLE-TAG)) ...
|
|
|
(define (HAS-ID? this) (has-table? this 'TABLE-TAG)) ...)))]))
|
|
|
|
|
|
(define (has-table? this tag)
|
|
|
#;((or/c bytes? symbol?) . ->m . boolean?)
|
|
|
(define directory (force (ttf-font-directory this)))
|
|
|
(hash-has-key? (hash-ref directory 'tables) (match tag
|
|
|
[(? bytes?) (string->symbol (bytes->string/latin-1 tag))]
|
|
|
[_ tag])))
|
|
|
|
|
|
(define (get-table this table-tag)
|
|
|
(unless (has-table? this table-tag)
|
|
|
(raise-argument-error 'get-table "table that exists in font" table-tag))
|
|
|
(hash-ref! (ttf-font-decoded-tables this) table-tag (λ () (decode-table this table-tag))))
|
|
|
|
|
|
(define-table-getters)
|
|
|
|
|
|
(define (get-table-stream this tag)
|
|
|
(define directory (force (ttf-font-directory this)))
|
|
|
(define table (hash-ref (hash-ref directory 'tables) tag))
|
|
|
(and table (pos (ttf-font-port this) (hash-ref table 'offset)) (ttf-font-port this)))
|
|
|
|
|
|
(define (decode-table this table-tag)
|
|
|
(unless (hash-has-key? table-codecs table-tag)
|
|
|
(raise-argument-error 'decode-table "decodable table" table-tag))
|
|
|
(define directory (force (ttf-font-directory this)))
|
|
|
(define table (hash-ref (hash-ref directory 'tables) table-tag))
|
|
|
;; todo: possible to avoid copying the bytes here?
|
|
|
(pos (ttf-font-port this) (hash-ref table 'offset))
|
|
|
(define table-bytes (open-input-bytes (peek-bytes (hash-ref table 'length) 0 (ttf-font-port this))))
|
|
|
(define table-decoder (hash-ref table-codecs table-tag))
|
|
|
(decode table-decoder table-bytes #:parent this))
|
|
|
|