73 lines
2.6 KiB
C
73 lines
2.6 KiB
C
/* Pango
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* pango-direction.h: Unicode text direction
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*
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* Copyright (C) 2018 Matthias Clasen
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __PANGO_DIRECTION_H__
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#define __PANGO_DIRECTION_H__
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#include <glib.h>
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G_BEGIN_DECLS
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/**
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* PangoDirection:
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* @PANGO_DIRECTION_LTR: A strong left-to-right direction
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* @PANGO_DIRECTION_RTL: A strong right-to-left direction
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* @PANGO_DIRECTION_TTB_LTR: Deprecated value; treated the
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* same as `PANGO_DIRECTION_RTL`.
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* @PANGO_DIRECTION_TTB_RTL: Deprecated value; treated the
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* same as `PANGO_DIRECTION_LTR`
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* @PANGO_DIRECTION_WEAK_LTR: A weak left-to-right direction
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* @PANGO_DIRECTION_WEAK_RTL: A weak right-to-left direction
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* @PANGO_DIRECTION_NEUTRAL: No direction specified
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*
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* `PangoDirection` represents a direction in the Unicode bidirectional
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* algorithm.
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*
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* Not every value in this enumeration makes sense for every usage of
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* `PangoDirection`; for example, the return value of [func@unichar_direction]
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* and [func@find_base_dir] cannot be `PANGO_DIRECTION_WEAK_LTR` or
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* `PANGO_DIRECTION_WEAK_RTL`, since every character is either neutral
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* or has a strong direction; on the other hand `PANGO_DIRECTION_NEUTRAL`
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* doesn't make sense to pass to [func@itemize_with_base_dir].
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*
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* The `PANGO_DIRECTION_TTB_LTR`, `PANGO_DIRECTION_TTB_RTL` values come from
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* an earlier interpretation of this enumeration as the writing direction
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* of a block of text and are no longer used. See `PangoGravity` for how
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* vertical text is handled in Pango.
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*
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* If you are interested in text direction, you should really use fribidi
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* directly. `PangoDirection` is only retained because it is used in some
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* public apis.
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*/
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typedef enum {
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PANGO_DIRECTION_LTR,
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PANGO_DIRECTION_RTL,
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PANGO_DIRECTION_TTB_LTR,
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PANGO_DIRECTION_TTB_RTL,
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PANGO_DIRECTION_WEAK_LTR,
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PANGO_DIRECTION_WEAK_RTL,
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PANGO_DIRECTION_NEUTRAL
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} PangoDirection;
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G_END_DECLS
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#endif /* __PANGO_DIRECTION_H__ */
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