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/* Pango
* pango-glyph.h: Glyph storage
*
* Copyright (C) 2000 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_GLYPH_H__
#define __PANGO_GLYPH_H__
#include <pango/pango-types.h>
#include <pango/pango-item.h>
G_BEGIN_DECLS
typedef struct _PangoGlyphGeometry PangoGlyphGeometry;
typedef struct _PangoGlyphVisAttr PangoGlyphVisAttr;
typedef struct _PangoGlyphInfo PangoGlyphInfo;
typedef struct _PangoGlyphString PangoGlyphString;
/* 1024ths of a device unit */
/**
* PangoGlyphUnit:
*
* The #PangoGlyphUnit type is used to store dimensions within
* Pango. Dimensions are stored in 1/%PANGO_SCALE of a device unit.
* (A device unit might be a pixel for screen display, or
* a point on a printer.) %PANGO_SCALE is currently 1024, and
* may change in the future (unlikely though), but you should not
* depend on its exact value. The PANGO_PIXELS() macro can be used
* to convert from glyph units into device units with correct rounding.
*/
typedef gint32 PangoGlyphUnit;
/* Positioning information about a glyph
*/
/**
* PangoGlyphGeometry:
* @width: the logical width to use for the the character.
* @x_offset: horizontal offset from nominal character position.
* @y_offset: vertical offset from nominal character position.
*
* The #PangoGlyphGeometry structure contains width and positioning
* information for a single glyph.
*/
struct _PangoGlyphGeometry
{
PangoGlyphUnit width;
PangoGlyphUnit x_offset;
PangoGlyphUnit y_offset;
};
/* Visual attributes of a glyph
*/
/**
* PangoGlyphVisAttr:
* @is_cluster_start: set for the first logical glyph in each cluster. (Clusters
* are stored in visual order, within the cluster, glyphs
* are always ordered in logical order, since visual
* order is meaningless; that is, in Arabic text, accent glyphs
* follow the glyphs for the base character.)
*
* The PangoGlyphVisAttr is used to communicate information between
* the shaping phase and the rendering phase. More attributes may be
* added in the future.
*/
struct _PangoGlyphVisAttr
{
guint is_cluster_start : 1;
};
/* A single glyph
*/
/**
* PangoGlyphInfo:
* @glyph: the glyph itself.
* @geometry: the positional information about the glyph.
* @attr: the visual attributes of the glyph.
*
* The #PangoGlyphInfo structure represents a single glyph together with
* positioning information and visual attributes.
* It contains the following fields.
*/
struct _PangoGlyphInfo
{
PangoGlyph glyph;
PangoGlyphGeometry geometry;
PangoGlyphVisAttr attr;
};
/* A string of glyphs with positional information and visual attributes -
* ready for drawing
*/
/**
* PangoGlyphString:
* @num_glyphs: number of the glyphs in this glyph string.
* @glyphs: (array length=num_glyphs): array of glyph information
* for the glyph string.
* @log_clusters: logical cluster info, indexed by the byte index
* within the text corresponding to the glyph string.
*
* The #PangoGlyphString structure is used to store strings
* of glyphs with geometry and visual attribute information.
* The storage for the glyph information is owned
* by the structure which simplifies memory management.
*/
struct _PangoGlyphString {
gint num_glyphs;
PangoGlyphInfo *glyphs;
/* This is a memory inefficient way of representing the information
* here - each value gives the byte index within the text
* corresponding to the glyph string of the start of the cluster to
* which the glyph belongs.
*/
gint *log_clusters;
/*< private >*/
gint space;
};
/**
* PANGO_TYPE_GLYPH_STRING:
*
* The #GObject type for #PangoGlyphString.
*/
#define PANGO_TYPE_GLYPH_STRING (pango_glyph_string_get_type ())
PangoGlyphString *pango_glyph_string_new (void);
void pango_glyph_string_set_size (PangoGlyphString *string,
gint new_len);
GType pango_glyph_string_get_type (void) G_GNUC_CONST;
PangoGlyphString *pango_glyph_string_copy (PangoGlyphString *string);
void pango_glyph_string_free (PangoGlyphString *string);
void pango_glyph_string_extents (PangoGlyphString *glyphs,
PangoFont *font,
PangoRectangle *ink_rect,
PangoRectangle *logical_rect);
int pango_glyph_string_get_width(PangoGlyphString *glyphs);
void pango_glyph_string_extents_range (PangoGlyphString *glyphs,
int start,
int end,
PangoFont *font,
PangoRectangle *ink_rect,
PangoRectangle *logical_rect);
void pango_glyph_string_get_logical_widths (PangoGlyphString *glyphs,
const char *text,
int length,
int embedding_level,
int *logical_widths);
void pango_glyph_string_index_to_x (PangoGlyphString *glyphs,
char *text,
int length,
PangoAnalysis *analysis,
int index_,
gboolean trailing,
int *x_pos);
void pango_glyph_string_x_to_index (PangoGlyphString *glyphs,
char *text,
int length,
PangoAnalysis *analysis,
int x_pos,
int *index_,
int *trailing);
/* Turn a string of characters into a string of glyphs
*/
void pango_shape (const gchar *text,
gint length,
const PangoAnalysis *analysis,
PangoGlyphString *glyphs);
void pango_shape_full (const gchar *item_text,
gint item_length,
const gchar *paragraph_text,
gint paragraph_length,
const PangoAnalysis *analysis,
PangoGlyphString *glyphs);
GList *pango_reorder_items (GList *logical_items);
G_END_DECLS
#endif /* __PANGO_GLYPH_H__ */
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