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/*
* Copyright (C) 2006, 2007 Red Hat Software
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <glib.h>
G_BEGIN_DECLS
/**
* Pango2Gravity:
* @PANGO2_GRAVITY_SOUTH: Glyphs stand upright (default) <img align="right" valign="center" src="m-south.png">
* @PANGO2_GRAVITY_EAST: Glyphs are rotated 90 degrees counter-clockwise. <img align="right" valign="center" src="m-east.png">
* @PANGO2_GRAVITY_NORTH: Glyphs are upside-down. <img align="right" valign="cener" src="m-north.png">
* @PANGO2_GRAVITY_WEST: Glyphs are rotated 90 degrees clockwise. <img align="right" valign="center" src="m-west.png">
* @PANGO2_GRAVITY_AUTO: Gravity is resolved from the context matrix
*
* `Pango2Gravity` 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 [struct@Pango2.Matrix], and then
* glyph orientation is controlled using `Pango2Gravity`.
*
* Not every value in this enumeration makes sense for every usage of
* `Pango2Gravity`; for example, %PANGO2_GRAVITY_AUTO only can be passed to
* [method@Pango2.Context.set_base_gravity] and can only be returned by
* [method@Pango2.Context.get_base_gravity].
*
* See also: [enum@Pango2.GravityHint]
*/
typedef enum {
PANGO2_GRAVITY_SOUTH,
PANGO2_GRAVITY_EAST,
PANGO2_GRAVITY_NORTH,
PANGO2_GRAVITY_WEST,
PANGO2_GRAVITY_AUTO
} Pango2Gravity;
/**
* Pango2GravityHint:
* @PANGO2_GRAVITY_HINT_NATURAL: scripts will take their natural gravity based
* on the base gravity and the script. This is the default.
* @PANGO2_GRAVITY_HINT_STRONG: always use the base gravity set, regardless of
* the script.
* @PANGO2_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.
*
* `Pango2GravityHint` defines how horizontal scripts should behave in a
* vertical context.
*
* That is, English excerpts in a vertical paragraph for example.
*
* See also [enum@Pango2.Gravity]
*/
typedef enum {
PANGO2_GRAVITY_HINT_NATURAL,
PANGO2_GRAVITY_HINT_STRONG,
PANGO2_GRAVITY_HINT_LINE
} Pango2GravityHint;
/**
* PANGO2_GRAVITY_IS_VERTICAL:
* @gravity: the `Pango2Gravity` to check
*
* Whether a `Pango2Gravity` represents vertical writing directions.
*
* Returns: %TRUE if @gravity is %PANGO2_GRAVITY_EAST or %PANGO2_GRAVITY_WEST,
* %FALSE otherwise.
*/
#define PANGO2_GRAVITY_IS_VERTICAL(gravity) \
((gravity) == PANGO2_GRAVITY_EAST || (gravity) == PANGO2_GRAVITY_WEST)
/**
* PANGO2_GRAVITY_IS_IMPROPER:
* @gravity: the `Pango2Gravity` to check
*
* Whether a `Pango2Gravity` represents a gravity that results in reversal
* of text direction.
*
* Returns: %TRUE if @gravity is %PANGO2_GRAVITY_WEST or %PANGO2_GRAVITY_NORTH,
* %FALSE otherwise.
*/
#define PANGO2_GRAVITY_IS_IMPROPER(gravity) \
((gravity) == PANGO2_GRAVITY_WEST || (gravity) == PANGO2_GRAVITY_NORTH)
#include <pango/pango-matrix.h>
#include <pango/pango-script.h>
PANGO2_AVAILABLE_IN_ALL
double pango2_gravity_to_rotation (Pango2Gravity gravity) G_GNUC_CONST;
PANGO2_AVAILABLE_IN_ALL
Pango2Gravity pango2_gravity_get_for_matrix (const Pango2Matrix *matrix) G_GNUC_PURE;
PANGO2_AVAILABLE_IN_ALL
Pango2Gravity pango2_gravity_get_for_script (GUnicodeScript script,
Pango2Gravity base_gravity,
Pango2GravityHint hint) G_GNUC_CONST;
PANGO2_AVAILABLE_IN_ALL
Pango2Gravity pango2_gravity_get_for_script_and_width
(GUnicodeScript script,
gboolean wide,
Pango2Gravity base_gravity,
Pango2GravityHint hint) G_GNUC_CONST;
G_END_DECLS
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