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/* Pango
* pango-gravity.h: Gravity routines
*
* Copyright (C) 2006, 2007 Red Hat Software
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef __PANGO_GRAVITY_H__
#define __PANGO_GRAVITY_H__
#include <glib.h>
G_BEGIN_DECLS
/**
* PangoGravity:
* @PANGO_GRAVITY_SOUTH: Glyphs stand upright (default)
* @PANGO_GRAVITY_EAST: Glyphs are rotated 90 degrees clockwise
* @PANGO_GRAVITY_NORTH: Glyphs are upside-down
* @PANGO_GRAVITY_WEST: Glyphs are rotated 90 degrees counter-clockwise
* @PANGO_GRAVITY_AUTO: Gravity is resolved from the context matrix
*
* The #PangoGravity type represents the orientation of glyphs in a segment
* of text. This is useful when rendering vertical text layouts. In
* those situations, the layout is rotated using a non-identity PangoMatrix,
* and then glyph orientation is controlled using #PangoGravity.
* Not every value in this enumeration makes sense for every usage of
* #PangoGravity; for example, %PANGO_GRAVITY_AUTO only can be passed to
* pango_context_set_base_gravity() and can only be returned by
* pango_context_get_base_gravity().
*
* See also: #PangoGravityHint
*
* Since: 1.16
**/
typedef enum {
PANGO_GRAVITY_SOUTH,
PANGO_GRAVITY_EAST,
PANGO_GRAVITY_NORTH,
PANGO_GRAVITY_WEST,
PANGO_GRAVITY_AUTO
} PangoGravity;
/**
* PangoGravityHint:
* @PANGO_GRAVITY_HINT_NATURAL: scripts will take their natural gravity based
* on the base gravity and the script. This is the default.
* @PANGO_GRAVITY_HINT_STRONG: always use the base gravity set, regardless of
* the script.
* @PANGO_GRAVITY_HINT_LINE: for scripts not in their natural direction (eg.
* Latin in East gravity), choose per-script gravity such that every script
* respects the line progression. This means, Latin and Arabic will take
* opposite gravities and both flow top-to-bottom for example.
*
* The #PangoGravityHint defines how horizontal scripts should behave in a
* vertical context. That is, English excerpt in a vertical paragraph for
* example.
*
* See #PangoGravity.
*
* Since: 1.16
**/
typedef enum {
PANGO_GRAVITY_HINT_NATURAL,
PANGO_GRAVITY_HINT_STRONG,
PANGO_GRAVITY_HINT_LINE
} PangoGravityHint;
/**
* PANGO_GRAVITY_IS_VERTICAL:
* @gravity: the #PangoGravity to check
*
* Whether a #PangoGravity represents vertical writing directions.
*
* Returns: %TRUE if @gravity is %PANGO_GRAVITY_EAST or %PANGO_GRAVITY_WEST,
* %FALSE otherwise.
*
* Since: 1.16
**/
#define PANGO_GRAVITY_IS_VERTICAL(gravity) \
((gravity) == PANGO_GRAVITY_EAST || (gravity) == PANGO_GRAVITY_WEST)
/**
* PANGO_GRAVITY_IS_IMPROPER:
* @gravity: the #PangoGravity to check
*
* Whether a #PangoGravity represents a gravity that results in reversal of text direction.
*
* Returns: %TRUE if @gravity is %PANGO_GRAVITY_WEST or %PANGO_GRAVITY_NORTH,
* %FALSE otherwise.
*
* Since: 1.32
**/
#define PANGO_GRAVITY_IS_IMPROPER(gravity) \
((gravity) == PANGO_GRAVITY_WEST || (gravity) == PANGO_GRAVITY_NORTH)
#include <pango/pango-matrix.h>
#include <pango/pango-script.h>
double pango_gravity_to_rotation (PangoGravity gravity) G_GNUC_CONST;
PangoGravity pango_gravity_get_for_matrix (const PangoMatrix *matrix) G_GNUC_PURE;
PangoGravity pango_gravity_get_for_script (PangoScript script,
PangoGravity base_gravity,
PangoGravityHint hint) G_GNUC_CONST;
PangoGravity pango_gravity_get_for_script_and_width
(PangoScript script,
gboolean wide,
PangoGravity base_gravity,
PangoGravityHint hint) G_GNUC_CONST;
G_END_DECLS
#endif /* __PANGO_GRAVITY_H__ */
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