57 lines
1.5 KiB
Factor
57 lines
1.5 KiB
Factor
USING: alien alien.c-types
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math kernel byte-arrays freetype
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opengl.gadgets accessors pango
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ui.gadgets memoize
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arrays sequences libc opengl.gl
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system combinators alien.syntax
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pango.layouts ;
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IN: pango.ft2
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<< "pangoft2" {
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{ [ os winnt? ] [ "libpangocairo-1.0-0.dll" ] }
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{ [ os macosx? ] [ "libpangocairo-1.0.0.dylib" ] }
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{ [ os unix? ] [ "libpangoft2-1.0.so" ] }
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} cond "cdecl" add-library >>
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LIBRARY: pangoft2
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FUNCTION: PangoFontMap*
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pango_ft2_font_map_new ( ) ;
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FUNCTION: PangoContext*
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pango_ft2_font_map_create_context ( PangoFT2FontMap* fontmap ) ;
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FUNCTION: void
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pango_ft2_render_layout ( FT_Bitmap* bitmap, PangoLayout* layout, int x, int y ) ;
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: 4*-ceil ( n -- k*4 )
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3 + 4 /i 4 * ;
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: <ft-bitmap> ( width height -- ft-bitmap )
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swap dup
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2dup * 4*-ceil
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"uchar" malloc-array
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256
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FT_PIXEL_MODE_GRAY
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"FT_Bitmap" <c-object> dup >r
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{
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[ set-FT_Bitmap-pixel_mode ]
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[ set-FT_Bitmap-num_grays ]
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[ set-FT_Bitmap-buffer ]
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[ set-FT_Bitmap-pitch ]
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[ set-FT_Bitmap-width ]
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[ set-FT_Bitmap-rows ]
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} cleave r> ;
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: render-layout ( layout -- dims alien )
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[
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pango-layout-get-pixel-size
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2array dup 2^-bounds first2 <ft-bitmap> dup
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] [ 0 0 pango_ft2_render_layout ] bi FT_Bitmap-buffer ;
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MEMO: ft2-context ( -- PangoContext* )
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pango_ft2_font_map_new pango_ft2_font_map_create_context ;
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: with-ft2-layout ( quot -- )
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ft2-context pango_layout_new swap with-layout ; inline
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