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/* Pango
* pango-types.h:
*
* Copyright (C) 1999 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_TYPES_H__
#define __PANGO_TYPES_H__
#include <glib.h>
#include <glib-object.h>
#include <pango/pango-version-macros.h>
G_BEGIN_DECLS
typedef struct _PangoLogAttr PangoLogAttr;
#ifndef __GI_SCANNER__
typedef struct _PangoEngineLang PangoEngineLang;
typedef struct _PangoEngineShape PangoEngineShape;
#endif
typedef struct _PangoFont PangoFont;
typedef struct _PangoFontMap PangoFontMap;
typedef struct _PangoRectangle PangoRectangle;
/* A index of a glyph into a font. Rendering system dependent */
/**
* PangoGlyph:
*
* A `PangoGlyph` represents a single glyph in the output form of a string.
*/
typedef guint32 PangoGlyph;
/**
* PANGO_SCALE:
*
* The scale between dimensions used for Pango distances and device units.
*
* The definition of device units is dependent on the output device; it will
* typically be pixels for a screen, and points for a printer. %PANGO_SCALE is
* currently 1024, but this may be changed in the future.
*
* When setting font sizes, device units are always considered to be
* points (as in "12 point font"), rather than pixels.
*/
/**
* PANGO_PIXELS:
* @d: a dimension in Pango units.
*
* Converts a dimension to device units by rounding.
*
* Return value: rounded dimension in device units.
*/
/**
* PANGO_PIXELS_FLOOR:
* @d: a dimension in Pango units.
*
* Converts a dimension to device units by flooring.
*
* Return value: floored dimension in device units.
* Since: 1.14
*/
/**
* PANGO_PIXELS_CEIL:
* @d: a dimension in Pango units.
*
* Converts a dimension to device units by ceiling.
*
* Return value: ceiled dimension in device units.
* Since: 1.14
*/
#define PANGO_SCALE 1024
#define PANGO_PIXELS(d) (((int)(d) + 512) >> 10)
#define PANGO_PIXELS_FLOOR(d) (((int)(d)) >> 10)
#define PANGO_PIXELS_CEIL(d) (((int)(d) + 1023) >> 10)
/* The above expressions are just slightly wrong for floating point d;
* For example we'd expect PANGO_PIXELS(-512.5) => -1 but instead we get 0.
* That's unlikely to matter for practical use and the expression is much
* more compact and faster than alternatives that work exactly for both
* integers and floating point.
*
* PANGO_PIXELS also behaves differently for +512 and -512.
*/
/**
* PANGO_UNITS_ROUND:
* @d: a dimension in Pango units.
*
* Rounds a dimension to whole device units, but does not
* convert it to device units.
*
* Return value: rounded dimension in Pango units.
* Since: 1.18
*/
#define PANGO_UNITS_ROUND(d) \
(((d) + (PANGO_SCALE >> 1)) & ~(PANGO_SCALE - 1))
PANGO_AVAILABLE_IN_1_16
int pango_units_from_double (double d) G_GNUC_CONST;
PANGO_AVAILABLE_IN_1_16
double pango_units_to_double (int i) G_GNUC_CONST;
/**
* PangoRectangle:
* @x: X coordinate of the left side of the rectangle.
* @y: Y coordinate of the the top side of the rectangle.
* @width: width of the rectangle.
* @height: height of the rectangle.
*
* The `PangoRectangle` structure represents a rectangle.
*
* `PangoRectangle` is frequently used to represent the logical or ink
* extents of a single glyph or section of text. (See, for instance,
* [method@Pango.Font.get_glyph_extents].)
*/
struct _PangoRectangle
{
int x;
int y;
int width;
int height;
};
/* Macros to translate from extents rectangles to ascent/descent/lbearing/rbearing
*/
/**
* PANGO_ASCENT:
* @rect: a `PangoRectangle`
*
* Extracts the *ascent* from a `PangoRectangle`
* representing glyph extents.
*
* The ascent is the distance from the baseline to the
* highest point of the character. This is positive if the
* glyph ascends above the baseline.
*/
/**
* PANGO_DESCENT:
* @rect: a `PangoRectangle`
*
* Extracts the *descent* from a `PangoRectangle`
* representing glyph extents.
*
* The descent is the distance from the baseline to the
* lowest point of the character. This is positive if the
* glyph descends below the baseline.
*/
/**
* PANGO_LBEARING:
* @rect: a `PangoRectangle`
*
* Extracts the *left bearing* from a `PangoRectangle`
* representing glyph extents.
*
* The left bearing is the distance from the horizontal
* origin to the farthest left point of the character.
* This is positive for characters drawn completely to
* the right of the glyph origin.
*/
/**
* PANGO_RBEARING:
* @rect: a `PangoRectangle`
*
* Extracts the *right bearing* from a `PangoRectangle`
* representing glyph extents.
*
* The right bearing is the distance from the horizontal
* origin to the farthest right point of the character.
* This is positive except for characters drawn completely
* to the left of the horizontal origin.
*/
#define PANGO_ASCENT(rect) (-(rect).y)
#define PANGO_DESCENT(rect) ((rect).y + (rect).height)
#define PANGO_LBEARING(rect) ((rect).x)
#define PANGO_RBEARING(rect) ((rect).x + (rect).width)
PANGO_AVAILABLE_IN_1_16
void pango_extents_to_pixels (PangoRectangle *inclusive,
PangoRectangle *nearest);
#include <pango/pango-gravity.h>
#include <pango/pango-language.h>
#include <pango/pango-matrix.h>
#include <pango/pango-script.h>
#include <pango/pango-bidi-type.h>
G_END_DECLS
#endif /* __PANGO_TYPES_H__ */
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