GI.Pango.Objects.FontMap

The FontMap represents the set of fonts available for a particular rendering system. This is a virtual object with implementations being specific to particular rendering systems. To create an implementation of a FontMap, the rendering-system specific code should allocate a larger structure that contains a nested FontMap, fill in the <structfield>klass</structfield> member of the nested FontMap with a pointer to a appropriate FontMapClass, then call pango_font_map_init() on the structure.

The FontMap structure contains one member which the implementation fills in.

Exported types

newtype FontMap

Memory-managed wrapper type.

Constructors

FontMap (ManagedPtr FontMap)

Instances

GObject FontMap

Defined in GI.Pango.Objects.FontMap

Methods

gobjectType :: IO GType

HasParentTypes FontMap

Defined in GI.Pango.Objects.FontMap

type ParentTypes FontMap

Defined in GI.Pango.Objects.FontMap

type ParentTypes FontMap = Object ': ([] :: [Type])

class (GObject o, IsDescendantOf FontMap o) => IsFontMap o

Type class for types which can be safely cast to FontMap, for instance with toFontMap.

Instances

(GObject o, IsDescendantOf FontMap o) => IsFontMap o

Defined in GI.Pango.Objects.FontMap

toFontMap :: (MonadIO m, IsFontMap o) => o -> m FontMap

Cast to FontMap, for types for which this is known to be safe. For general casts, use castTo.

noFontMap :: Maybe FontMap

A convenience alias for Nothing :: Maybe FontMap.

Methods

changed

fontMapChanged

Arguments

:: (HasCallStack, MonadIO m, IsFontMap a)

=> a

fontmap: a FontMap

-> m ()

Forces a change in the context, which will cause any Context using this fontmap to change.

This function is only useful when implementing a new backend for Pango, something applications won't do. Backends should call this function if they have attached extra data to the context and such data is changed.

Since: 1.34

createContext

fontMapCreateContext

Arguments

:: (HasCallStack, MonadIO m, IsFontMap a)

=> a

fontmap: a FontMap

-> m Context

Returns: the newly allocated Context, which should be freed with objectUnref.

Creates a Context connected to fontmap. This is equivalent to contextNew followed by contextSetFontMap.

If you are using Pango as part of a higher-level system, that system may have it's own way of create a Context. For instance, the GTK+ toolkit has, among others, gdk_pango_context_get_for_screen(), and gtk_widget_get_pango_context(). Use those instead.

Since: 1.22

getSerial

fontMapGetSerial

Arguments

:: (HasCallStack, MonadIO m, IsFontMap a)

=> a

fontmap: a FontMap

-> m Word32

Returns: The current serial number of fontmap.

Returns the current serial number of fontmap. The serial number is initialized to an small number larger than zero when a new fontmap is created and is increased whenever the fontmap is changed. It may wrap, but will never have the value 0. Since it can wrap, never compare it with "less than", always use "not equals".

The fontmap can only be changed using backend-specific API, like changing fontmap resolution.

This can be used to automatically detect changes to a FontMap, like in Context.

Since: 1.32.4

getShapeEngineType

fontMapGetShapeEngineType

Arguments

:: (HasCallStack, MonadIO m, IsFontMap a)

=> a

fontmap: a FontMap

-> m Text

Returns: the ID string for shape engines for this fontmap. Owned by Pango, should not be modified or freed.

Deprecated: (Since version 1.38)

Returns the render ID for shape engines for this fontmap. See the <structfield>render_type</structfield> field of EngineInfo.

Since: 1.4

listFamilies

fontMapListFamilies

Arguments

:: (HasCallStack, MonadIO m, IsFontMap a)

=> a

fontmap: a FontMap

-> m [FontFamily]

List all families for a fontmap.

loadFont

fontMapLoadFont

Arguments

:: (HasCallStack, MonadIO m, IsFontMap a, IsContext b)

=> a

fontmap: a FontMap

-> b

context: the Context the font will be used with

-> FontDescription

desc: a FontDescription describing the font to load

-> m (Maybe Font)

Returns: the newly allocated Font loaded, or Nothing if no font matched.

Load the font in the fontmap that is the closest match for desc.

loadFontset

fontMapLoadFontset

Arguments

:: (HasCallStack, MonadIO m, IsFontMap a, IsContext b)

=> a

fontmap: a FontMap

-> b

context: the Context the font will be used with

-> FontDescription

desc: a FontDescription describing the font to load

-> Language

language: a Language the fonts will be used for

-> m (Maybe Fontset)

Returns: the newly allocated Fontset loaded, or Nothing if no font matched.

Load a set of fonts in the fontmap that can be used to render a font matching desc.