118 lines
3.9 KiB
Factor
118 lines
3.9 KiB
Factor
! Copyright (C) 2009 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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USING: arrays alien alien.c-types alien.syntax kernel destructors
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accessors fry words hashtables strings sequences memoize assocs math
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math.functions locals init namespaces combinators fonts colors cache
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core-foundation core-foundation.strings core-foundation.attributed-strings
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core-foundation.utilities core-graphics core-graphics.types
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core-text.fonts core-text.utilities ;
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IN: core-text
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TYPEDEF: void* CTLineRef
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C-GLOBAL: kCTFontAttributeName
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C-GLOBAL: kCTKernAttributeName
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C-GLOBAL: kCTLigatureAttributeName
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C-GLOBAL: kCTForegroundColorAttributeName
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C-GLOBAL: kCTParagraphStyleAttributeName
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C-GLOBAL: kCTUnderlineStyleAttributeName
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C-GLOBAL: kCTVerticalFormsAttributeName
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C-GLOBAL: kCTGlyphInfoAttributeName
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FUNCTION: CTLineRef CTLineCreateWithAttributedString ( CFAttributedStringRef string ) ;
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FUNCTION: void CTLineDraw ( CTLineRef line, CGContextRef context ) ;
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FUNCTION: CGFloat CTLineGetOffsetForStringIndex ( CTLineRef line, CFIndex charIndex, CGFloat* secondaryOffset ) ;
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FUNCTION: CFIndex CTLineGetStringIndexForPosition ( CTLineRef line, CGPoint position ) ;
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FUNCTION: double CTLineGetTypographicBounds ( CTLineRef line, CGFloat* ascent, CGFloat* descent, CGFloat* leading ) ;
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FUNCTION: CGRect CTLineGetImageBounds ( CTLineRef line, CGContextRef context ) ;
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ERROR: not-a-string object ;
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: <CTLine> ( string open-font color -- line )
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[
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[
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dup selection? [ string>> ] when
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dup string? [ not-a-string ] unless
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] 2dip
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[
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kCTForegroundColorAttributeName set
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kCTFontAttributeName set
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] H{ } make-assoc <CFAttributedString> &CFRelease
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CTLineCreateWithAttributedString
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] with-destructors ;
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TUPLE: line font line metrics image disposed ;
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: compute-line-metrics ( open-font line -- line-metrics )
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[
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[ metrics new ] dip
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[ CTFontGetCapHeight >>cap-height ]
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[ CTFontGetXHeight >>x-height ]
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bi
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] dip
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0 <CGFloat> 0 <CGFloat> 0 <CGFloat>
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[ CTLineGetTypographicBounds ] 3keep
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{
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[ >>width ]
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[ *CGFloat >>ascent ]
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[ *CGFloat >>descent ]
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[ *CGFloat >>leading ]
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} spread
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dup compute-height ;
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: bounds>dim ( bounds -- dim )
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[ width>> ] [ [ ascent>> ] [ descent>> ] bi + ] bi
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[ ceiling >integer ]
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bi@ 2array ;
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: fill-background ( context font dim -- )
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[ background>> >rgba-components CGContextSetRGBFillColor ]
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[ [ 0 0 ] dip first2 <CGRect> CGContextFillRect ]
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bi-curry* bi ;
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: selection-rect ( dim line selection -- rect )
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[ start>> ] [ end>> ] bi
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[ f CTLineGetOffsetForStringIndex round ] bi-curry@ bi
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[ drop nip 0 ] [ swap - swap second ] 3bi <CGRect> ;
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:: fill-selection-background ( context dim line string -- )
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string selection? [
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context string color>> >rgba-components CGContextSetRGBFillColor
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context dim line string selection-rect CGContextFillRect
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] when ;
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: set-text-position ( context metrics -- )
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[ 0 ] dip descent>> ceiling CGContextSetTextPosition ;
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:: <line> ( font string -- line )
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[
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[let* | open-font [ font cache-font CFRetain |CFRelease ]
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line [ string open-font font foreground>> <CTLine> |CFRelease ]
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metrics [ open-font line compute-line-metrics ]
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dim [ metrics bounds>dim ] |
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open-font line metrics
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dim [
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{
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[ font dim fill-background ]
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[ dim line string fill-selection-background ]
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[ metrics set-text-position ]
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[ [ line ] dip CTLineDraw ]
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} cleave
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] make-bitmap-image
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]
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f line boa
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] with-destructors ;
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M: line dispose* [ font>> CFRelease ] [ line>> CFRelease ] bi ;
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SYMBOL: cached-lines
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: cached-line ( font string -- line )
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cached-lines get [ <line> ] 2cache ;
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[ <cache-assoc> cached-lines set-global ] "core-text" add-init-hook |