! Copyright (C) 2009, 2010 Slava Pestov.
! See http://factorcode.org/license.txt for BSD license.
-USING: accessors assocs cache kernel math math.vectors
-namespaces pango pango.cairo ui.text ui.text.private
-sequences ;
+USING: accessors alien.c-types alien.strings arrays assocs cache cairo
+cairo.ffi classes.struct combinators destructors fonts fry
+init io.encodings.utf8 kernel math math.rectangles math.vectors
+memoize namespaces sequences ui.text ui.text.private
+gobject gobject.ffi pango pango.ffi pango.cairo pango.cairo.ffi ;
IN: ui.text.pango
+: pango>float ( n -- x ) PANGO_SCALE /f ; inline
+: float>pango ( x -- n ) PANGO_SCALE * >integer ; inline
+
+MEMO: (cache-font-description) ( font -- description )
+ [
+ [ pango_font_description_new |pango_font_description_free ] dip {
+ [ name>> utf8 string>alien pango_font_description_set_family ]
+ [ size>> float>pango pango_font_description_set_size ]
+ [ bold?>> PANGO_WEIGHT_BOLD PANGO_WEIGHT_NORMAL ? pango_font_description_set_weight ]
+ [ italic?>> PANGO_STYLE_ITALIC PANGO_STYLE_NORMAL ? pango_font_description_set_style ]
+ [ drop ]
+ } 2cleave
+ ] with-destructors ;
+
+: cache-font-description ( font -- description )
+ strip-font-colors (cache-font-description) ;
+
+
+TUPLE: layout < disposable font string selection layout metrics ink-rect logical-rect image ;
+
+SYMBOL: dpi
+
+72 dpi set-global
+
+: set-layout-font ( font layout -- )
+ swap cache-font-description pango_layout_set_font_description ;
+
+: set-layout-text ( str layout -- )
+ swap utf8 string>alien -1 pango_layout_set_text ;
+
+: PangoRectangle>rect ( PangoRectangle -- rect )
+ [ [ x>> pango>float ] [ y>> pango>float ] bi 2array ]
+ [ [ width>> pango>float ] [ height>> pango>float ] bi 2array ] bi
+ <rect> ;
+
+: layout-extents ( layout -- ink-rect logical-rect )
+ PangoRectangle <struct>
+ PangoRectangle <struct>
+ [ pango_layout_get_extents ] 2keep
+ [ PangoRectangle>rect ] bi@ ;
+
+: layout-baseline ( layout -- baseline )
+ pango_layout_get_iter &pango_layout_iter_free
+ pango_layout_iter_get_baseline
+ pango>float ;
+
+: set-foreground ( cr font -- )
+ foreground>> set-source-color ;
+
+: fill-background ( cr font dim -- )
+ [ background>> set-source-color ]
+ [ [ { 0 0 } ] dip <rect> fill-rect ] bi-curry* bi ;
+
+: rect-translate-x ( rect x -- rect' )
+ '[ _ 0 2array v- ] change-loc ;
+
+: first-line ( layout -- line )
+ layout>> 0 pango_layout_get_line_readonly ;
+
+: line-offset>x ( layout n -- x )
+ #! n is an index into the UTF8 encoding of the text
+ [ drop first-line ] [ swap string>> >utf8-index ] 2bi
+ 0 0 <int> [ pango_layout_line_index_to_x ] keep
+ *int pango>float ;
+
+: x>line-offset ( layout x -- n )
+ #! n is an index into the UTF8 encoding of the text
+ [
+ [ first-line ] dip
+ float>pango 0 <int> 0 <int>
+ [ pango_layout_line_x_to_index drop ] 2keep
+ [ *int ] bi@ swap
+ ] [ drop string>> ] 2bi utf8-index> + ;
+
+: selection-start/end ( selection -- start end )
+ selection>> [ start>> ] [ end>> ] bi ;
+
+: selection-rect ( layout -- rect )
+ [ ink-rect>> dim>> ] [ ] [ selection-start/end ] tri [ line-offset>x ] bi-curry@ bi
+ [ drop nip 0 2array ] [ swap - swap second 2array ] 3bi <rect> ;
+
+: fill-selection-background ( cr layout -- )
+ dup selection>> [
+ [ selection>> color>> set-source-color ]
+ [
+ [ selection-rect ] [ ink-rect>> loc>> first ] bi
+ rect-translate-x
+ fill-rect
+ ] 2bi
+ ] [ 2drop ] if ;
+
+: text-position ( layout -- loc )
+ [ logical-rect>> ] [ ink-rect>> ] bi [ loc>> ] bi@ v- ;
+
+: set-text-position ( cr loc -- )
+ first2 cairo_move_to ;
+
+: draw-layout ( layout -- image )
+ dup ink-rect>> dim>> [ >fixnum ] map [
+ swap {
+ [ layout>> pango_cairo_update_layout ]
+ [ [ font>> ] [ ink-rect>> dim>> ] bi fill-background ]
+ [ fill-selection-background ]
+ [ text-position set-text-position ]
+ [ font>> set-foreground ]
+ [ layout>> pango_cairo_show_layout ]
+ } 2cleave
+ ] make-bitmap-image ;
+
+: escape-nulls ( str -- str' )
+ #! Replace nulls with something else since Pango uses null-terminated
+ #! strings
+ { { 0 CHAR: zero-width-no-break-space } } substitute ;
+
+: unpack-selection ( layout string/selection -- layout )
+ dup selection? [
+ [ string>> escape-nulls >>string ] [ >>selection ] bi
+ ] [ escape-nulls >>string ] if ; inline
+
+: set-layout-resolution ( layout -- )
+ pango_layout_get_context dpi get pango_cairo_context_set_resolution ;
+
+: <PangoLayout> ( text font -- layout )
+ dummy-cairo pango_cairo_create_layout |g_object_unref
+ [ set-layout-resolution ] keep
+ [ set-layout-font ] keep
+ [ set-layout-text ] keep ;
+
+: glyph-height ( font string -- y )
+ swap <PangoLayout> &g_object_unref layout-extents drop dim>> second ;
+
+MEMO: missing-font-metrics ( font -- metrics )
+ #! Pango doesn't provide x-height and cap-height but Core Text does, so we
+ #! simulate them on Pango.
+ [
+ [ metrics new ] dip
+ [ "x" glyph-height >>x-height ]
+ [ "Y" glyph-height >>cap-height ] bi
+ ] with-destructors ;
+
+: layout-metrics ( layout -- metrics )
+ dup font>> missing-font-metrics clone
+ swap
+ [ layout>> layout-baseline >>ascent ]
+ [ logical-rect>> dim>> [ first >>width ] [ second >>height ] bi ] bi
+ dup [ height>> ] [ ascent>> ] bi - >>descent ;
+
+: <layout> ( font string -- line )
+ [
+ layout new-disposable
+ swap unpack-selection
+ swap >>font
+ dup [ string>> ] [ font>> ] bi <PangoLayout> >>layout
+ dup layout>> layout-extents [ >>ink-rect ] [ >>logical-rect ] bi*
+ dup layout-metrics >>metrics
+ dup draw-layout >>image
+ ] with-destructors ;
+
+M: layout dispose* layout>> g_object_unref ;
+
+SYMBOL: cached-layouts
+
+: cached-layout ( font string -- layout )
+ cached-layouts get [ <layout> ] 2cache ;
+
+: cached-line ( font string -- line )
+ cached-layout layout>> first-line ;
+
SINGLETON: pango-renderer
M: pango-renderer string-dim
[ cached-layout metrics>> ]
if-empty ;
+[
+ \ (cache-font-description) reset-memoized
+ <cache-assoc> cached-layouts set-global
+] "ui.text.pango" add-startup-hook
+
pango-renderer font-renderer set-global
+
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