1 ! Copyright (C) 2005, 2009 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: alien alien.accessors alien.c-types arrays io kernel libc
4 math math.vectors namespaces opengl opengl.gl opengl.sprites assocs
5 sequences io.files continuations freetype
6 ui.gadgets.worlds ui.text ui.text.private ui.backend
7 byte-arrays accessors locals specialized-arrays.direct.uchar
11 SINGLETON: freetype-renderer
15 : freetype-error ( n -- )
16 zero? [ "FreeType error" throw ] unless ;
20 : init-freetype ( -- )
22 f <void*> dup FT_Init_FreeType freetype-error
24 H{ } clone open-fonts set
27 : freetype ( -- alien )
28 \ freetype get-global expired? [ init-freetype ] when
29 \ freetype get-global ;
31 TUPLE: freetype-font < identity-tuple
32 ascent descent height handle widths ;
34 M: freetype-font hashcode* drop freetype-font hashcode* ;
36 : close-font ( font -- ) handle>> FT_Done_Face ;
38 : close-freetype ( -- )
40 open-fonts [ [ drop close-font ] assoc-each f ] change
41 freetype [ FT_Done_FreeType f ] change
44 M: freetype-renderer free-fonts ( world -- )
45 values [ second free-sprites ] each ;
47 : ttf-name ( font -- name )
48 [ [ name>> ] [ bold?>> ] [ italic?>> ] tri ] output>array H{
49 { { "monospace" f f } "VeraMono" }
50 { { "monospace" t f } "VeraMoBd" }
51 { { "monospace" t t } "VeraMoBI" }
52 { { "monospace" f t } "VeraMoIt" }
53 { { "sans-serif" f f } "Vera" }
54 { { "sans-serif" t f } "VeraBd" }
55 { { "sans-serif" t t } "VeraBI" }
56 { { "sans-serif" f t } "VeraIt" }
57 { { "serif" f f } "VeraSe" }
58 { { "serif" t f } "VeraSeBd" }
59 { { "serif" t t } "VeraBI" }
60 { { "serif" f t } "VeraIt" }
63 : ttf-path ( name -- string )
64 "resource:fonts/" ".ttf" surround ;
66 : (open-face) ( path length -- face )
67 #! We use FT_New_Memory_Face, not FT_New_Face, since
68 #! FT_New_Face only takes an ASCII path name and causes
69 #! problems on localized versions of Windows
70 [ freetype ] 2dip 0 f <void*> [
71 FT_New_Memory_Face freetype-error
74 : open-face ( font -- face )
75 ttf-name ttf-path malloc-file-contents (open-face) ;
81 : ft-floor ( m -- n ) -6 shift ; inline
83 : ft-ceil ( m -- n ) 63 + -64 bitand -6 shift ; inline
85 : font-units>pixels ( n font -- n )
86 face-size face-size-y-scale FT_MulFix ;
88 : init-ascent ( font face -- font )
89 dup face-y-max swap font-units>pixels >>ascent ; inline
91 : init-descent ( font face -- font )
92 dup face-y-min swap font-units>pixels >>descent ; inline
94 : init-font ( font -- font )
95 dup handle>> init-ascent
96 dup handle>> init-descent
97 dup [ ascent>> ] [ descent>> ] bi - ft-ceil >>height ; inline
99 : set-char-size ( open-font size -- open-font )
100 [ dup handle>> 0 ] dip
101 6 shift dpi get-global dup FT_Set_Char_Size freetype-error ;
103 : <freetype-font> ( font -- open-font )
106 over open-face >>handle
107 swap size>> set-char-size
110 : open-font ( font -- open-font )
111 freetype drop open-fonts get [ <freetype-font> ] cache ;
113 : load-glyph ( font char -- glyph )
114 [ handle>> dup ] dip 0 FT_Load_Char
115 freetype-error face-glyph ;
117 : char-width ( open-font char -- w )
119 dupd load-glyph glyph-hori-advance ft-ceil
122 M: freetype-renderer string-width ( font string -- w )
123 [ [ 0 ] dip open-font ] dip [ char-width + ] with each ;
125 M: freetype-renderer string-height ( font string -- h )
126 drop open-font height>> ;
128 : glyph-size ( glyph -- dim )
129 [ glyph-hori-advance ft-ceil ]
130 [ glyph-height ft-ceil ]
133 : render-glyph ( font char -- bitmap )
135 FT_RENDER_MODE_NORMAL FT_Render_Glyph freetype-error ;
137 :: copy-pixel ( i j bitmap texture -- i j )
138 255 j texture set-nth
139 i bitmap nth j 1 + texture set-nth
142 :: (copy-row) ( i j bitmap texture end -- )
144 i j bitmap texture copy-pixel
145 bitmap texture end (copy-row)
146 ] when ; inline recursive
148 :: copy-row ( i j bitmap texture width width2 -- i j )
149 i j bitmap texture i width + (copy-row)
153 :: copy-bitmap ( glyph texture -- )
154 [let* | bitmap [ glyph glyph-bitmap-buffer ]
155 rows [ glyph glyph-bitmap-rows ]
156 width [ glyph glyph-bitmap-width ]
157 width2 [ width next-power-of-2 2 * ] |
159 bitmap rows width * <direct-uchar-array> :> bitmap'
161 rows [ bitmap' texture width width2 copy-row ] times
166 : bitmap>texture ( glyph sprite -- id )
167 tuck dim2>> product 2 * <byte-array>
168 [ copy-bitmap ] keep [ dim2>> ] dip
169 GL_LUMINANCE_ALPHA GL_UNSIGNED_BYTE make-texture ;
171 : glyph-texture-loc ( glyph font -- loc )
172 [ drop glyph-hori-bearing-x ft-floor ]
173 [ ascent>> swap glyph-hori-bearing-y - ft-floor ]
176 : glyph-texture-size ( glyph -- dim )
177 [ glyph-bitmap-width next-power-of-2 ]
178 [ glyph-bitmap-rows next-power-of-2 ]
181 : <char-sprite> ( open-font char -- sprite )
182 over [ render-glyph dup ] dip glyph-texture-loc
183 over glyph-size pick glyph-texture-size <sprite>
184 [ bitmap>texture ] keep [ init-sprite ] keep ;
186 :: char-sprite ( open-font sprites char -- sprite )
187 char sprites [ open-font swap <char-sprite> ] cache ;
189 : draw-char ( open-font sprites char loc -- )
192 char-sprite dlist>> glCallList
195 : char-widths ( open-font string -- widths )
196 [ char-width ] with { } map-as ;
198 : scan-sums ( seq -- seq' )
199 0 [ + ] accumulate nip ;
201 :: (draw-string) ( open-font sprites string loc -- )
204 string open-font string char-widths scan-sums [
205 [ open-font sprites ] 2dip draw-char
210 : font-sprites ( font world -- open-font sprites )
211 fonts>> [ open-font H{ } clone 2array ] cache first2 ;
213 M: freetype-renderer draw-string ( font string loc -- )
214 [ world get font-sprites ] 2dip (draw-string) ;
216 : run-char-widths ( open-font string -- widths )
217 char-widths [ scan-sums ] [ 2 v/n ] bi v+ ;
219 M: freetype-renderer x>offset ( x font string -- n )
221 [ run-char-widths [ <= ] with find drop ] keep swap
224 M:: freetype-renderer offset>x ( n font string -- x )
225 font open-font string n head string-width ;
227 freetype-renderer font-renderer set-global