Functions
pango_context_changed ()
void
pango_context_changed (PangoContext *context);
Forces a change in the context, which will cause any PangoLayout
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.
Since: 1.32.4
pango_context_get_serial ()
guint
pango_context_get_serial (PangoContext *context);
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 PangoFontMap 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 PangoContext, and
is only useful when implementing objects that need update when their
PangoContext changes, like PangoLayout.
Returns
The current serial number of context
.
Since: 1.32.4
pango_context_set_font_map ()
void
pango_context_set_font_map (PangoContext *context,
PangoFontMap *font_map);
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 PangoContext obtained
via one of the recommended methods should already have a suitable font map.
pango_context_get_font_map ()
PangoFontMap *
pango_context_get_font_map (PangoContext *context);
Gets the PangoFontMap used to look up fonts for this context.
Returns
the font map for the PangoContext.
This value is owned by Pango and should not be unreferenced.
[transfer none]
Since: 1.6
pango_context_get_font_description ()
PangoFontDescription *
pango_context_get_font_description (PangoContext *context);
Retrieve the default font description for the context.
Returns
a pointer to the context's default font
description. This value must not be modified or freed.
[transfer none]
pango_context_set_font_description ()
void
pango_context_set_font_description (PangoContext *context,
const PangoFontDescription *desc);
Set the default font description for the context
pango_context_get_language ()
PangoLanguage *
pango_context_get_language (PangoContext *context);
Retrieves the global language tag for the context.
Returns
the global language tag.
pango_context_set_language ()
void
pango_context_set_language (PangoContext *context,
PangoLanguage *language);
Sets the global language tag for the context. The default language
for the locale of the running process can be found using
pango_language_get_default().
pango_context_set_base_gravity ()
void
pango_context_set_base_gravity (PangoContext *context,
PangoGravity gravity);
Sets the base gravity for the context.
The base gravity is used in laying vertical text out.
Since: 1.16
pango_context_get_matrix ()
const PangoMatrix *
pango_context_get_matrix (PangoContext *context);
Gets the transformation matrix that will be applied when
rendering with this context. See pango_context_set_matrix().
Returns
the matrix, or NULL if no matrix has
been set (which is the same as the identity matrix). The returned
matrix is owned by Pango and must not be modified or freed.
[nullable]
Since: 1.6
pango_context_set_matrix ()
void
pango_context_set_matrix (PangoContext *context,
const PangoMatrix *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.
Since: 1.6
pango_context_get_round_glyph_positions ()
gboolean
pango_context_get_round_glyph_positions
(PangoContext *context);
Returns whether font rendering with this context should
round glyph positions and widths.
Since: 1.44
pango_context_set_round_glyph_positions ()
void
pango_context_set_round_glyph_positions
(PangoContext *context,
gboolean round_positions);
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.
Since: 1.44
pango_context_load_font ()
PangoFont *
pango_context_load_font (PangoContext *context,
const PangoFontDescription *desc);
Loads the font in one of the fontmaps in the context
that is the closest match for desc
.
Returns
the newly allocated PangoFont
that was loaded, or NULL if no font matched.
[transfer full][nullable]
pango_context_get_metrics ()
PangoFontMetrics *
pango_context_get_metrics (PangoContext *context,
const PangoFontDescription *desc,
PangoLanguage *language);
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 PangoFontDescription is interpreted in the same way as
by pango_itemize(), and the family name may be a comma separated
list of figures. 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.
pango_context_list_families ()
void
pango_context_list_families (PangoContext *context,
PangoFontFamily ***families,
int *n_families);
List all families for a context.