:right-sidebar: True

Buffer
===================================================================

.. currentmodule:: gi.repository.PangoOT





.. class:: Buffer(**kwargs)
   :no-contents-entry:






:Constructors:

::

    new(font:PangoFc.Font) -> PangoOT.Buffer



Constructors
------------

.. rst-class:: interim-class

.. class:: Buffer
   :no-index:


   .. classmethod:: new(font: ~gi.repository.PangoFc.Font) -> ~gi.repository.PangoOT.Buffer

      Creates a new ``PangoOTBuffer`` for the given OpenType font.



      .. versionadded:: 1.4





      :param font: a ``PangoFcFont``









Methods
-------

.. rst-class:: interim-class

.. class:: Buffer
   :no-index:


   .. method:: add_glyph(glyph: int, properties: int, cluster: int) -> None

      Appends a glyph to a ``PangoOTBuffer``, with ``properties`` identifying which
      features should be applied on this glyph.

      See :obj:`~gi.repository.PangoOT.Ruleset.add_feature`.



      .. versionadded:: 1.4





      :param glyph: the glyph index to add, like a ``PangoGlyph``


      :param properties: the glyph properties


      :param cluster: the cluster that this glyph belongs to





   .. method:: clear() -> None

      Empties a ``PangoOTBuffer``, make it ready to add glyphs to.



      .. versionadded:: 1.4








   .. method:: destroy() -> None

      Destroys a ``PangoOTBuffer`` and free all associated memory.



      .. versionadded:: 1.4








   .. method:: get_glyphs() -> list[~gi.repository.PangoOT.Glyph]

      Gets the glyph array contained in a ``PangoOTBuffer``.

      The glyphs are owned by the buffer and should not be freed,
      and are only valid as long as buffer is not modified.



      .. versionadded:: 1.4








   .. method:: output(glyphs: ~gi.repository.Pango.GlyphString) -> None

      Exports the glyphs in a ``PangoOTBuffer`` into a ``PangoGlyphString``.

      This is typically used after the OpenType layout processing
      is over, to convert the resulting glyphs into a generic Pango
      glyph string.



      .. versionadded:: 1.4





      :param glyphs: a ``PangoGlyphString``





   .. method:: set_rtl(rtl: bool) -> None

      Sets whether glyphs will be rendered right-to-left.

      This setting is needed for proper horizontal positioning
      of right-to-left scripts.



      .. versionadded:: 1.4





      :param rtl: :const:`True` for right-to-left text





   .. method:: set_zero_width_marks(zero_width_marks: bool) -> None

      Sets whether characters with a mark class should be forced to zero width.

      This setting is needed for proper positioning of Arabic accents,
      but will produce incorrect results with standard OpenType Indic
      fonts.



      .. versionadded:: 1.6





      :param zero_width_marks: :const:`True` if characters with a mark class should
         be forced to zero width