PangoFcFont

PangoFcFont — Base font class for Fontconfig-based backends

Properties

PangoFcFontMap * fontmap Read / Write
gpointer pattern Read / Write / Construct Only

Types and Values

Object Hierarchy

    GObject
    ╰── PangoFont
        ╰── PangoFcFont
            ╰── PangoXftFont

Description

PangoFcFont is a base class for font implementation using the Fontconfig and FreeType libraries. It is used in the

Xft and FreeType

backends shipped with Pango, but can also be used when creating new backends. Any backend deriving from this base class will take advantage of the wide range of shapers implemented using FreeType that come with Pango.

Functions

pango_fc_font_lock_face ()

FT_Face
pango_fc_font_lock_face (PangoFcFont *font);

Gets the FreeType FT_Face associated with a font, This face will be kept around until you call pango_fc_font_unlock_face().

Parameters

font

a PangoFcFont.

 

Returns

the FreeType FT_Face associated with font .

Since: 1.4


pango_fc_font_unlock_face ()

void
pango_fc_font_unlock_face (PangoFcFont *font);

Releases a font previously obtained with pango_fc_font_lock_face().

Parameters

font

a PangoFcFont.

 

Since: 1.4


pango_fc_font_has_char ()

gboolean
pango_fc_font_has_char (PangoFcFont *font,
                        gunichar wc);

Determines whether font has a glyph for the codepoint wc .

Parameters

font

a PangoFcFont

 

wc

Unicode codepoint to look up

 

Returns

TRUE if font has the requested codepoint.

Since: 1.4


pango_fc_font_get_glyph ()

guint
pango_fc_font_get_glyph (PangoFcFont *font,
                         gunichar wc);

Gets the glyph index for a given Unicode character for font . If you only want to determine whether the font has the glyph, use pango_fc_font_has_char().

Parameters

font

a PangoFcFont

 

wc

Unicode character to look up

 

Returns

the glyph index, or 0, if the Unicode character doesn't exist in the font.

Since: 1.4


pango_fc_font_get_unknown_glyph ()

PangoGlyph
pango_fc_font_get_unknown_glyph (PangoFcFont *font,
                                 gunichar wc);

pango_fc_font_get_unknown_glyph is deprecated and should not be used in newly-written code.

Returns the index of a glyph suitable for drawing wc as an unknown character.

Use PANGO_GET_UNKNOWN_GLYPH() instead.

Parameters

font

a PangoFcFont

 

wc

the Unicode character for which a glyph is needed.

 

Returns

a glyph index into font .

Since: 1.4


pango_fc_font_kern_glyphs ()

void
pango_fc_font_kern_glyphs (PangoFcFont *font,
                           PangoGlyphString *glyphs);

pango_fc_font_kern_glyphs has been deprecated since version 1.32 and should not be used in newly-written code.

Adjust each adjacent pair of glyphs in glyphs according to kerning information in font .

Parameters

font

a PangoFcFont

 

glyphs

a PangoGlyphString

 

Since: 1.4

Types and Values

struct PangoFcFont

struct PangoFcFont;

PangoFcFont is a base class for font implementations using the Fontconfig and FreeType libraries and is used in conjunction with PangoFcFontMap. When deriving from this class, you need to implement all of its virtual functions other than shutdown() along with the get_glyph_extents() virtual function from PangoFont.


struct PangoFcFontClass

struct PangoFcFontClass {
  FT_Face    (*lock_face)         (PangoFcFont      *font);
  void       (*unlock_face)       (PangoFcFont      *font);
  gboolean   (*has_char)          (PangoFcFont      *font,
				   gunichar          wc);
  guint      (*get_glyph)         (PangoFcFont      *font,
				   gunichar          wc);
  PangoGlyph (*get_unknown_glyph) (PangoFcFont      *font,
				   gunichar          wc);
  void       (*shutdown)          (PangoFcFont      *font);
};

Class structure for PangoFcFont.

Members

lock_face ()

Returns the FT_Face of the font and increases the reference count for the face by one.

 

unlock_face ()

Decreases the reference count for the FT_Face of the font by one. When the count is zero, the PangoFcFont subclass is allowed to free the FT_Face.

 

has_char ()

Return TRUE if the the font contains a glyph corresponding to the specified character.

 

get_glyph ()

Gets the glyph that corresponds to the given Unicode character.

 

get_unknown_glyph ()

Gets the glyph that should be used to display an unknown-glyph indication for the specified Unicode character. May be NULL.

[nullable]

shutdown ()

Performs any font-specific shutdown code that needs to be done when pango_fc_font_map_shutdown is called. May be NULL.

[nullable]

PANGO_RENDER_TYPE_FC

#define PANGO_RENDER_TYPE_FC "PangoRenderFc"

A string constant used to identify shape engines that work with the fontconfig based backends. See the engine_type field of PangoEngineInfo.

Property Details

The “fontmap” property

  “fontmap”                  PangoFcFontMap *

The PangoFc font map this font is associated with (Since: 1.26).

Flags: Read / Write


The “pattern” property

  “pattern”                  gpointer

The fontconfig pattern for this font.

Flags: Read / Write / Construct Only

See Also

PangoFcFontMap

The base class for font maps; creating a new Fontconfig-based backend involves deriving from both PangoFcFontMap and PangoFcFont.