Struct pangocairo::prelude::FontMap[][src]

pub struct FontMap(_);
Expand description

FontMap is an interface exported by font maps for use with Cairo. The actual type of the font map will depend on the particular font technology Cairo was compiled to use.

Implements

FontMapExt, trait@pango::prelude::FontMapExt, FontMapExtManual

Implementations

Gets a default FontMap to use with Cairo.

Note that the type of the returned object will depend on the particular font backend Cairo was compiled to use; You generally should only use the pango::FontMap and FontMap interfaces on the returned object.

The default Cairo fontmap can be changed by using [FontMapExtManual::set_default()][crate::prelude::FontMapExtManual::set_default()]. This can be used to change the Cairo font backend that the default fontmap uses for example.

Note that since Pango 1.32.6, the default fontmap is per-thread. Each thread gets its own default fontmap. In this way, PangoCairo can be used safely from multiple threads.

Returns

the default PangoCairo fontmap for the current thread. This object is owned by Pango and must not be freed.

Creates a new FontMap object; a fontmap is used to cache information about available fonts, and holds certain global parameters such as the resolution. In most cases, you can use default() instead.

Note that the type of the returned object will depend on the particular font backend Cairo was compiled to use; You generally should only use the pango::FontMap and FontMap interfaces on the returned object.

You can override the type of backend returned by using an environment variable PANGOCAIRO_BACKEND. Supported types, based on your build, are fc (fontconfig), win32, and coretext. If requested type is not available, NULL is returned. Ie. this is only useful for testing, when at least two backends are compiled in.

Returns

the newly allocated pango::FontMap, which should be freed with g_object_unref().

Trait Implementations

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

Formats the value using the given formatter. Read more

Formats the value using the given formatter. Read more

Feeds this value into the given Hasher. Read more

Feeds a slice of this type into the given Hasher. Read more

This method returns an Ordering between self and other. Read more

Compares and returns the maximum of two values. Read more

Compares and returns the minimum of two values. Read more

Restrict a value to a certain interval. Read more

This method tests for self and other values to be equal, and is used by ==. Read more

This method tests for !=.

This method returns an ordering between self and other values if one exists. Read more

This method tests less than (for self and other) and is used by the < operator. Read more

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more

This method tests greater than (for self and other) and is used by the > operator. Read more

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more

Returns the type identifier of Self.

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Upcasts an object to a superclass or interface T. Read more

Upcasts an object to a reference of its superclass or interface T. Read more

Tries to downcast to a subclass or interface implementor T. Read more

Tries to downcast to a reference of its subclass or interface implementor T. Read more

Tries to cast to an object of type T. This handles upcasting, downcasting and casting between interface and interface implementors. All checks are performed at runtime, while downcast and upcast will do many checks at compile-time already. Read more

Tries to cast to reference to an object of type T. This handles upcasting, downcasting and casting between interface and interface implementors. All checks are performed at runtime, while downcast and upcast will do many checks at compile-time already. Read more

Casts to T unconditionally. Read more

Casts to &T unconditionally. Read more

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

Creates a Context connected to self. This is equivalent to Context::new() followed by Context::set_font_map(). Read more

This is supported on crate feature v1_46 only.

Gets a font family by name. Read more

Returns the current serial number of self. 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”. Read more

List all families for a fontmap. Read more

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

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

Performs the conversion.

Performs the conversion.

Returns true if the object is an instance of (can be cast to) T.

Safety Read more

Safety Read more

Safety Read more

Safety Read more

Safety Read more

Safety Read more

Same as connect but takes a SignalId instead of a signal name.

Same as connect_local but takes a SignalId instead of a signal name.

Same as connect_unsafe but takes a SignalId instead of a signal name.

Emit signal by signal id.

Emit signal with details by signal id.

Emit signal by it’s name.

Same as emit but takes Value for the arguments.

Same as emit_by_name but takes Value for the arguments.

Same as emit_with_details but takes Value for the arguments.

The resulting type after obtaining ownership.

Creates owned data from borrowed data, usually by cloning. Read more

🔬 This is a nightly-only experimental API. (toowned_clone_into)

recently added

Uses borrowed data to replace owned data, usually by cloning. Read more

Returns a SendValue clone of self.

Converts the given value to a String. Read more

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.