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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>
#include <pango/pango-break.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.
*
* Note that @width is not guaranteed to be the same as the glyph
* extents. Kerning and other positioning applied during shaping will
* affect both the @width and the @x_offset for the glyphs in the
* glyph string that results from shaping.
*
* The information in this struct is intended for rendering the glyphs,
* as follows:
*
* 1. Render the current glyph at (x + x_offset, y + y_offset),
* where (x, y) is the current point
* 2. Advance the current point to (x + xoffset, y)
* 3. Render the next 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.)
*
* A `PangoGlyphVisAttr` structure communicates information between
* the shaping and rendering phases.
*
* Currently, it contains only cluster start information. 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.
*
* A `PangoGlyphInfo` structure represents a single glyph with
* positioning information and visual attributes.
*/
struct _PangoGlyphInfo
{
PangoGlyph glyph;
PangoGlyphGeometry geometry;
PangoGlyphVisAttr attr;
};
/**
* 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.
*
* A `PangoGlyphString` 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 {
int num_glyphs;
PangoGlyphInfo *glyphs;
int *log_clusters;
/*< private >*/
int space;
};
#define PANGO_TYPE_GLYPH_STRING (pango_glyph_string_get_type ())
PANGO_AVAILABLE_IN_ALL
GType pango_glyph_string_get_type (void) G_GNUC_CONST;
PANGO_AVAILABLE_IN_ALL
PangoGlyphString * pango_glyph_string_new (void);
PANGO_AVAILABLE_IN_ALL
void pango_glyph_string_set_size (PangoGlyphString *string,
int new_len);
PANGO_AVAILABLE_IN_ALL
PangoGlyphString * pango_glyph_string_copy (PangoGlyphString *string);
PANGO_AVAILABLE_IN_ALL
void pango_glyph_string_free (PangoGlyphString *string);
PANGO_AVAILABLE_IN_ALL
void pango_glyph_string_extents (PangoGlyphString *glyphs,
PangoFont *font,
PangoRectangle *ink_rect,
PangoRectangle *logical_rect);
PANGO_AVAILABLE_IN_1_14
int pango_glyph_string_get_width (PangoGlyphString *glyphs);
PANGO_AVAILABLE_IN_ALL
void pango_glyph_string_extents_range (PangoGlyphString *glyphs,
int start,
int end,
PangoFont *font,
PangoRectangle *ink_rect,
PangoRectangle *logical_rect);
PANGO_AVAILABLE_IN_ALL
void pango_glyph_string_get_logical_widths (PangoGlyphString *glyphs,
const char *text,
int length,
int embedding_level,
int *logical_widths);
PANGO_AVAILABLE_IN_ALL
void pango_glyph_string_index_to_x (PangoGlyphString *glyphs,
const char *text,
int length,
PangoAnalysis *analysis,
int index_,
gboolean trailing,
int *x_pos);
PANGO_AVAILABLE_IN_ALL
void pango_glyph_string_x_to_index (PangoGlyphString *glyphs,
const char *text,
int length,
PangoAnalysis *analysis,
int x_pos,
int *index_,
int *trailing);
PANGO_AVAILABLE_IN_1_50
void pango_glyph_string_index_to_x_full (PangoGlyphString *glyphs,
const char *text,
int length,
PangoAnalysis *analysis,
PangoLogAttr *attrs,
int index_,
gboolean trailing,
int *x_pos);
/* Shaping */
/**
* PangoShapeFlags:
* @PANGO_SHAPE_NONE: Default value.
* @PANGO_SHAPE_ROUND_POSITIONS: Round glyph positions
* and widths to whole device units. This option should
* be set if the target renderer can't do subpixel
* positioning of glyphs.
*
* Flags influencing the shaping process.
*
* `PangoShapeFlags` can be passed to [func@Pango.shape_with_flags].
*/
typedef enum {
PANGO_SHAPE_NONE = 0,
PANGO_SHAPE_ROUND_POSITIONS = 1 << 0,
} PangoShapeFlags;
PANGO_AVAILABLE_IN_ALL
void pango_shape (const char *text,
int length,
const PangoAnalysis *analysis,
PangoGlyphString *glyphs);
PANGO_AVAILABLE_IN_1_32
void pango_shape_full (const char *item_text,
int item_length,
const char *paragraph_text,
int paragraph_length,
const PangoAnalysis *analysis,
PangoGlyphString *glyphs);
PANGO_AVAILABLE_IN_1_44
void pango_shape_with_flags (const char *item_text,
int item_length,
const char *paragraph_text,
int paragraph_length,
const PangoAnalysis *analysis,
PangoGlyphString *glyphs,
PangoShapeFlags flags);
PANGO_AVAILABLE_IN_1_50
void pango_shape_item (PangoItem *item,
const char *paragraph_text,
int paragraph_length,
PangoLogAttr *log_attrs,
PangoGlyphString *glyphs,
PangoShapeFlags flags);
G_END_DECLS
#endif /* __PANGO_GLYPH_H__ */
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