! See http://factorcode.org/license.txt for BSD license.
!
! pangocairo bindings, from pango/pangocairo.h
-USING: alien alien.syntax combinators system cairo.ffi ;
+USING: arrays sequences alien alien.c-types alien.data
+alien.destructors alien.libraries alien.syntax math
+math.functions math.vectors destructors combinators colors fonts
+accessors assocs namespaces kernel pango pango.fonts
+pango.layouts glib unicode.data images cache init system
+math.rectangles fry memoize io.encodings.utf8 classes.struct
+cairo cairo.ffi ;
IN: pango.cairo
<< {
- { [ os winnt? ] [ "pangocairo" "libpangocairo-1.0-0.dll" "cdecl" add-library ] }
- { [ os macosx? ] [ "pangocairo" "/opt/local/lib/libpangocairo-1.0.0.dylib" "cdecl" add-library ] }
+ { [ os winnt? ] [ "pangocairo" "libpangocairo-1.0-0.dll" cdecl add-library ] }
+ { [ os macosx? ] [ "pangocairo" "/opt/local/lib/libpangocairo-1.0.0.dylib" cdecl add-library ] }
{ [ os unix? ] [ ] }
} cond >>
LIBRARY: pangocairo
+C-TYPE: PangoCairoFontMap
+C-TYPE: PangoCairoFont
+
FUNCTION: PangoFontMap*
pango_cairo_font_map_new ( ) ;
pango_cairo_layout_path ( cairo_t* cr, PangoLayout* layout ) ;
FUNCTION: void
-pango_cairo_error_underline_path ( cairo_t* cr, double x, double y, double width, double height ) ;
\ No newline at end of file
+pango_cairo_error_underline_path ( cairo_t* cr, double x, double y, double width, double height ) ;
+
+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 -- )
+ #! Replace nulls with something else since Pango uses null-terminated
+ #! strings
+ swap -1 pango_layout_set_text ;
+
+: 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 { int } [ pango_layout_line_index_to_x ] [ ] with-out-parameters
+ pango>float ;
+
+: x>line-offset ( layout x -- n )
+ #! n is an index into the UTF8 encoding of the text
+ [
+ [ first-line ] dip
+ float>pango
+ { int int }
+ [ pango_layout_line_x_to_index drop ] [ ] with-out-parameters
+ 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' )
+ { { 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 ;
+
+[ <cache-assoc> cached-layouts set-global ] "pango.cairo" add-startup-hook
projects / factor.git / blobdiff