1 ! Copyright (C) 2009 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: accessors alien.c-types alien.data alien.syntax arrays
4 assocs cache classes colors combinators core-foundation
5 core-foundation.attributed-strings core-foundation.strings
6 core-graphics core-graphics.types core-text.fonts destructors
7 fonts init kernel locals make math math.functions math.order
8 math.vectors memoize namespaces sequences strings
9 io.encodings.utf16n io.encodings.string ;
12 TYPEDEF: void* CTLineRef
14 C-GLOBAL: CFStringRef kCTFontAttributeName
15 C-GLOBAL: CFStringRef kCTKernAttributeName
16 C-GLOBAL: CFStringRef kCTLigatureAttributeName
17 C-GLOBAL: CFStringRef kCTForegroundColorAttributeName
18 C-GLOBAL: CFStringRef kCTParagraphStyleAttributeName
19 C-GLOBAL: CFStringRef kCTUnderlineStyleAttributeName
20 C-GLOBAL: CFStringRef kCTVerticalFormsAttributeName
21 C-GLOBAL: CFStringRef kCTGlyphInfoAttributeName
23 FUNCTION: CTLineRef CTLineCreateWithAttributedString ( CFAttributedStringRef string )
25 FUNCTION: void CTLineDraw ( CTLineRef line, CGContextRef context )
27 FUNCTION: CGFloat CTLineGetOffsetForStringIndex ( CTLineRef line, CFIndex charIndex, CGFloat* secondaryOffset )
29 FUNCTION: CFIndex CTLineGetStringIndexForPosition ( CTLineRef line, CGPoint position )
31 FUNCTION: double CTLineGetTypographicBounds ( CTLineRef line, CGFloat* ascent, CGFloat* descent, CGFloat* leading )
33 FUNCTION: CGRect CTLineGetImageBounds ( CTLineRef line, CGContextRef context )
37 MEMO: make-attributes ( open-font color -- hashtable )
39 kCTForegroundColorAttributeName ,,
40 kCTFontAttributeName ,,
43 : <CTLine> ( string open-font color -- line )
46 dup selection? [ string>> ] when
49 make-attributes <CFAttributedString> &CFRelease
50 CTLineCreateWithAttributedString
53 TUPLE: line < disposable font string line metrics image loc dim
54 render-loc render-dim ;
56 : typographic-bounds ( line -- width ascent descent leading )
57 { CGFloat CGFloat CGFloat }
58 [ CTLineGetTypographicBounds ] with-out-parameters ; inline
60 : store-typographic-bounds ( metrics width ascent descent leading -- metrics )
68 : compute-font-metrics ( metrics font -- metrics )
69 [ CTFontGetCapHeight >>cap-height ]
70 [ CTFontGetXHeight >>x-height ]
73 : compute-line-metrics ( open-font line -- line-metrics )
75 [ compute-font-metrics ]
76 [ typographic-bounds store-typographic-bounds ] bi*
79 : metrics>dim ( bounds -- dim )
80 [ width>> ] [ [ ascent>> ] [ descent>> ] bi + ] bi 2array ;
82 : fill-background ( context font dim -- )
83 [ background>> >rgba-components CGContextSetRGBFillColor ]
84 [ [ 0 0 ] dip first2 <CGRect> CGContextFillRect ]
87 : selection-rect ( dim line selection -- rect )
88 [let [ start>> ] [ end>> ] [ string>> ] tri :> ( start end string )
89 start end [ 0 swap string subseq utf16n encode length 2 /i ] bi@
91 [ f CTLineGetOffsetForStringIndex round ] bi-curry@ bi
92 [ drop nip 0 ] [ swap - swap second ] 3bi <CGRect> ;
94 : CGRect-translate-x ( CGRect x -- CGRect' )
95 [ dup CGRect-x ] dip - over set-CGRect-x ;
97 :: fill-selection-background ( context loc dim line string -- )
99 context string color>> >rgba-components CGContextSetRGBFillColor
100 context dim line string selection-rect
101 loc first CGRect-translate-x
105 : line-rect ( line -- rect )
106 dummy-context CTLineGetImageBounds ;
108 : set-text-position ( context loc -- )
109 first2 [ neg ] bi@ CGContextSetTextPosition ;
111 :: line-loc ( metrics loc dim -- loc )
113 metrics ascent>> ceiling dim second loc second + - 2array ;
115 :: <line> ( font string -- line )
118 font retina? get-global [ cache-font@2x ] [ cache-font ] if :> open-font
119 string open-font font foreground>> <CTLine> |CFRelease :> line
120 open-font line compute-line-metrics
121 [ >>metrics ] [ metrics>dim >>dim ] bi
127 :: render ( line -- line image )
128 line line>> :> ctline
129 line string>> :> string
134 ctline line-rect :> rect
135 rect origin>> CGPoint>loc :> (loc)
136 rect size>> CGSize>dim :> (dim)
138 (loc) (dim) v+ vceiling :> ext
139 ext loc [ - >integer 1 max ] 2map :> dim
141 loc line render-loc<<
142 dim line render-dim<<
144 line metrics>> loc dim line-loc line loc<<
148 line render-loc>> :> loc
149 line render-dim>> :> dim
153 [ font dim fill-background ]
154 [ loc dim ctline string fill-selection-background ]
155 [ loc set-text-position ]
156 [ [ ctline ] dip CTLineDraw ]
158 ] make-bitmap-image retina? get-global >>2x? ;
160 : line>image ( line -- image )
161 dup image>> [ render >>image ] unless image>> ;
163 M: line dispose* line>> CFRelease ;
167 : cached-line ( font string -- line )
168 cached-lines get-global [ <line> ] 2cache ;
170 [ <cache-assoc> cached-lines set-global f retina? set-global ] "core-text" add-startup-hook