Creates a new Pango::Context initialized to default values.

This function is not particularly useful as it should always be followed by a Pango::Context#font_map= call, and the function Pango::FontMap#create_context does these two steps together and hence users are recommended to use that.

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

Returns the type id (GType) registered in GLib type system.

Retrieves the base direction for the context.

See Pango::Context#base_dir=.

Sets the base direction for the context.

The base direction is used in applying the Unicode bidirectional algorithm; if the @direction is %PANGO_DIRECTION_LTR or %PANGO_DIRECTION_RTL, then the value will be used as the paragraph direction in the Unicode bidirectional algorithm. A value of %PANGO_DIRECTION_WEAK_LTR or %PANGO_DIRECTION_WEAK_RTL is used only for paragraphs that do not contain any strong characters themselves.

Retrieves the base gravity for the context.

See Pango::Context#base_gravity=.

Sets the base gravity for the context.

The base gravity is used in laying vertical text out.

Forces a change in the context, which will cause any Pango::Layout using this context to re-layout.

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.

Retrieve the default font description for the context.

Set the default font description for the context

Gets the Pango::FontMap used to look up fonts for this context.

Sets the font map to be searched when fonts are looked-up in this context.

This is only for internal use by Pango backends, a Pango::Context obtained via one of the recommended methods should already have a suitable font map.

Retrieves the gravity for the context.

This is similar to Pango::Context#base_gravity, except for when the base gravity is %PANGO_GRAVITY_AUTO for which Pango::Gravity#for_matrix is used to return the gravity from the current context matrix.

Retrieves the gravity hint for the context.

See Pango::Context#gravity_hint= for details.

Sets the gravity hint for the context.

The gravity hint is used in laying vertical text out, and is only relevant if gravity of the context as returned by Pango::Context#gravity is set to %PANGO_GRAVITY_EAST or %PANGO_GRAVITY_WEST.

Retrieves the global language tag for the context.

Sets the global language tag for the context.

The default language for the locale of the running process can be found using Pango::Language#default.

List all families for a context.

Loads the font in one of the fontmaps in the context that is the closest match for @desc.

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

Gets the transformation matrix that will be applied when rendering with this context.

See Pango::Context#matrix=.

Sets the transformation matrix that will be applied when rendering with this context.

Note that reported metrics are in the user space coordinates before the application of the matrix, not device-space coordinates after the application of the matrix. So, they don't scale with the matrix, though they may change slightly for different matrices, depending on how the text is fit to the pixel grid.

Get overall metric information for a particular font description.

Since the metrics may be substantially different for different scripts, a language tag can be provided to indicate that the metrics should be retrieved that correspond to the script(s) used by that language.

The Pango::FontDescription is interpreted in the same way as by #itemize, and the family name may be a comma separated list of names. If characters from multiple of these families would be used to render the string, then the returned fonts would be a composite of the metrics for the fonts loaded for the individual families.

Returns whether font rendering with this context should round glyph positions and widths.

Sets whether font rendering with this context should round glyph positions and widths to integral positions, in device units.

This is useful when the renderer can't handle subpixel positioning of glyphs.

The default value is to round glyph positions, to remain compatible with previous Pango behavior.

Returns the current serial number of @context.

The serial number is initialized to an small number larger than zero when a new context is created and is increased whenever the context is changed using any of the setter functions, or the Pango::FontMap it uses to find fonts has changed. The serial may wrap, but will never have the value 0. Since it can wrap, never compare it with "less than", always use "not equals".

This can be used to automatically detect changes to a Pango::Context, and is only useful when implementing objects that need update when their Pango::Context changes, like Pango::Layout.