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features test

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Matthew Butterick 6 years ago
parent abbd3b654a
commit 3007f8715d
1 changed files with 58 additions and 31 deletions
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89
fontland/fontland/harfbuzz-ffi.rkt
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@ -1,9 +1,8 @@
#lang racket/base
#lang debug racket/base
(require ffi/unsafe
ffi/unsafe/define
racket/draw/private/libs
"harfbuzz-helper.rkt"
racket/string racket/format)
"harfbuzz-helper.rkt")
(define-runtime-lib harfbuzz-lib
[(unix) (ffi-lib "libharfbuzz" '("1" ""))]
@ -18,13 +17,10 @@
;; types
(define _void-pointer (_cpointer 'void-pointer))
(define _char _byte)
(define _char-pointer (_cpointer 'char-pointer))
(define _uchar _ubyte)
(define _hb_buffer_t _pointer)
(define _one-char-array (make-array-type _char 1))
(define-cstruct _hb_language_impl_t
([s _one-char-array]))
(define _hb_language_t _hb_language_impl_t-pointer)
(define _bstring _bytes)
(define _hb_buffer_t (_cpointer 'hb_buffer_t))
(define _hb_language_t (_cpointer 'hb_language_t))
(define _hb_bool_t _int)
(define-harfbuzz hb_version (_fun (major : (_ptr o _uint))
(minor : (_ptr o _uint))
@ -32,7 +28,12 @@
-> _void
-> (format "~a.~a.~a" major minor micro)))
(define-harfbuzz hb_buffer_create (_fun -> _hb_buffer_t))
(define-harfbuzz hb_buffer_create (_fun -> (buf : _hb_buffer_t)
-> (let ()
(hb_buffer_set_direction buf 'HB_DIRECTION_LTR)
(hb_buffer_set_script buf 'HB_SCRIPT_LATIN)
(hb_buffer_set_language buf (hb_language_from_string #"en" -1))
buf)))
(define-harfbuzz hb_buffer_add_utf8 (_fun _hb_buffer_t _string/utf-8 _int _uint _int -> _void))
@ -44,8 +45,8 @@
(define-harfbuzz hb_buffer_set_script (_fun _hb_buffer_t _hb_script_t -> _void))
(define-harfbuzz hb_buffer_get_script (_fun _hb_buffer_t -> _hb_script_t))
(define-harfbuzz hb_language_from_string (_fun _bytes _int -> _hb_language_t))
(define-harfbuzz hb_language_to_string (_fun _hb_language_t -> _bytes))
(define-harfbuzz hb_language_from_string (_fun _bstring _int -> _hb_language_t))
(define-harfbuzz hb_language_to_string (_fun _hb_language_t -> _bstring))
(define-harfbuzz hb_buffer_set_language (_fun _hb_buffer_t _hb_language_t -> _void))
(define-harfbuzz hb_buffer_get_language (_fun _hb_buffer_t -> _hb_language_t))
@ -63,7 +64,21 @@
[end _uint]))
(define _hb_features_t (_or-null _hb_feature_t-pointer))
(define-harfbuzz hb_shape (_fun _hb_font_t _hb_buffer_t _hb_features_t _uint -> _void))
(define-harfbuzz hb_shape (_fun _hb_font_t
_hb_buffer_t
(feats : (_list i _hb_feature_t))
(_uint = (length feats))
-> _void))
(define-harfbuzz hb_feature_from_string (_fun (bstr : _bstring)
(_int = (bytes-length bstr))
(fs : (_ptr o _hb_feature_t))
-> (success? : _hb_bool_t)
-> (if success? fs (error 'hb_feature_from_string))))
#;(define-harfbuzz hb_feature_to_string (_fun _hb_feature_t
(buf : (_ptr o (make-array-type _byte 128)))
(_int = 128)
-> _void))
(define _hb_codepoint_t _uint32)
(define _hb_mask_t _uint32)
@ -109,12 +124,8 @@
(hb_buffer_add_utf8 buf text -1 0 -1)
;; Set the script, language and direction of the buffer.
(hb_buffer_set_direction buf 'HB_DIRECTION_LTR)
(check-true (eq? 'HB_DIRECTION_LTR (hb_buffer_get_direction buf)))
(hb_buffer_set_script buf 'HB_SCRIPT_LATIN)
(check-true (eq? 'HB_SCRIPT_LATIN (hb_buffer_get_script buf)))
(define buf-lang (hb_language_from_string #"en" -1))
(hb_buffer_set_language buf buf-lang)
(check-equal? #"en" (hb_language_to_string (hb_buffer_get_language buf)))
;; Create a face and a font, using FreeType for now.
@ -122,7 +133,7 @@
(define font (hb_ft_font_create face #f))
;; Shape!
(hb_shape font buf #f 0)
(hb_shape font buf null)
;; Get the glyph and position information.
(define glyph_infos (hb_buffer_get_glyph_infos buf))
@ -139,26 +150,42 @@
(define face (FT_New_Face ft-lib path-string 0))
(hb_ft_font_create face #f))
(define (shape font text)
(define HB_FEATURE_GLOBAL_START 0)
(define HB_FEATURE_GLOBAL_END 4294967295)
(define liga_on (hb_feature_from_string #"liga"))
(define liga_off (make-hb_feature_t (->tag #"liga") 0 0 4294967295))
(define kern_on (hb_feature_from_string #"kern"))
(define kern_off (make-hb_feature_t (->tag #"kern") 0 0 4294967295))
(define onum_on (hb_feature_from_string #"onum"))
(define onum_off (make-hb_feature_t (->tag #"onum") 0 0 4294967295))
(define (shape font text [feats null])
(define buf (hb_buffer_create))
(hb_buffer_set_direction buf 'HB_DIRECTION_LTR)
(hb_buffer_set_script buf 'HB_SCRIPT_LATIN)
(define buf-lang (hb_language_from_string #"en" -1))
(hb_buffer_set_language buf buf-lang)
(hb_buffer_set_language buf (hb_language_from_string #"en" -1))
(hb_buffer_add_utf8 buf text -1 0 -1)
(hb_shape font buf #f 0)
(hb_shape font buf feats)
(begin0
(list (map hb_glyph_info_t-codepoint (hb_buffer_get_glyph_infos buf))
(map hb_glyph_position_t-x_advance (hb_buffer_get_glyph_positions buf)))
(map cons (map hb_glyph_info_t-codepoint (hb_buffer_get_glyph_infos buf))
(map hb_glyph_position_t-x_advance (hb_buffer_get_glyph_positions buf)))
(hb_buffer_destroy buf)))
(require racket/list)
(define (random-string len)
(define chars (map integer->char (range 65 91)))
(list->string (for/list ([i (in-range len)])
(list-ref chars (random (length chars))))))
(list-ref chars (random (length chars))))))
(define f (make-font "charter.ttf"))
(require sugar/debug racket/list)
(shape f (random-string 10))
(module+ test
(define f (make-font "fira.ttf"))
(define test-str "Tofl 3")
(check-equal?
(shape f test-str)
'((249 . 432) (555 . 581) (732 . 590) (3 . 268) (2017 . 496)))
(check-equal?
(shape f test-str (list kern_off liga_off))
'((249 . 512) (555 . 581) (450 . 332) (514 . 291) (3 . 268) (2017 . 496)))
(check-equal?
(shape f test-str (list kern_on liga_on onum_on))
'((249 . 432) (555 . 581) (732 . 590) (3 . 268) (2027 . 487))))

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