hb-ot-layout.hh File Reference

#include "hb.hh"
#include "hb-font.hh"
#include "hb-buffer.hh"
#include "hb-open-type.hh"
#include "hb-ot-shape.hh"
#include "hb-set-digest.hh"

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Namespaces
	OT
	OT::Layout
	OT::Layout::GSUB

Macros
#define	unicode_props()   var2.u16[0]
#define	glyph_props()   var1.u16[0] /* GDEF glyph properties */
#define	lig_props()   var1.u8[2] /* GSUB/GPOS ligature tracking */
#define	syllable()   var1.u8[3] /* GSUB/GPOS shaping boundaries */
#define	foreach_syllable(buffer, start, end)
#define	info_cc(info)   (_hb_glyph_info_get_modified_combining_class (&(info)))
#define	foreach_grapheme(buffer, start, end)    foreach_group (buffer, start, end, _hb_grapheme_group_func)
#define	IS_LIG_BASE   0x10

Enumerations
enum	hb_ot_layout_glyph_props_flags_t {   HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH = 0x02u , HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE = 0x04u , HB_OT_LAYOUT_GLYPH_PROPS_MARK = 0x08u , HB_OT_LAYOUT_GLYPH_PROPS_SUBSTITUTED = 0x10u ,   HB_OT_LAYOUT_GLYPH_PROPS_LIGATED = 0x20u , HB_OT_LAYOUT_GLYPH_PROPS_MULTIPLIED = 0x40u , HB_OT_LAYOUT_GLYPH_PROPS_PRESERVE }
enum	hb_unicode_props_flags_t {   UPROPS_MASK_GEN_CAT = 0x001Fu , UPROPS_MASK_IGNORABLE = 0x0020u , UPROPS_MASK_HIDDEN = 0x0040u , UPROPS_MASK_CONTINUATION =0x0080u ,   UPROPS_MASK_Cf_ZWJ = 0x0100u , UPROPS_MASK_Cf_ZWNJ = 0x0200u }

Functions
HB_INTERNAL bool	hb_ot_layout_has_kerning (hb_face_t *face)
HB_INTERNAL bool	hb_ot_layout_has_machine_kerning (hb_face_t *face)
HB_INTERNAL bool	hb_ot_layout_has_cross_kerning (hb_face_t *face)
HB_INTERNAL void	hb_ot_layout_kern (const hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer)
HB_INTERNAL bool	hb_ot_layout_table_find_feature (hb_face_t *face, hb_tag_t table_tag, hb_tag_t feature_tag, unsigned int *feature_index)
	HB_MARK_AS_FLAG_T (hb_ot_layout_glyph_props_flags_t)
HB_INTERNAL void	hb_ot_layout_substitute_start (hb_font_t *font, hb_buffer_t *buffer)
HB_INTERNAL void	hb_ot_layout_delete_glyphs_inplace (hb_buffer_t *buffer, bool(*filter)(const hb_glyph_info_t *info))
HB_INTERNAL void	hb_ot_layout_substitute_lookup (OT::hb_ot_apply_context_t *c, const OT::Layout::GSUB::SubstLookup &lookup, const OT::hb_ot_layout_lookup_accelerator_t &accel)
HB_INTERNAL void	hb_ot_layout_position_start (hb_font_t *font, hb_buffer_t *buffer)
HB_INTERNAL void	hb_ot_layout_position_finish_advances (hb_font_t *font, hb_buffer_t *buffer)
HB_INTERNAL void	hb_ot_layout_position_finish_offsets (hb_font_t *font, hb_buffer_t *buffer)
	HB_MARK_AS_FLAG_T (hb_unicode_props_flags_t)

Macro Definition Documentation

foreach_grapheme

#define foreach_grapheme	(		buffer,
			start,
			end
	)		foreach_group (buffer, start, end, _hb_grapheme_group_func)

Definition at line 352 of file hb-ot-layout.hh.

foreach_syllable

#define foreach_syllable	(		buffer,
			start,
			end
	)

Value:

  for (unsigned int \
       _count = buffer->len, \
       start = 0, end = _count ? _hb_next_syllable (buffer, 0) : 0; \
       start < _count; \
       start = end, end = _hb_next_syllable (buffer, start))

Definition at line 155 of file hb-ot-layout.hh.

glyph_props

#define glyph_props

(

)

var1.u16[0] /* GDEF glyph properties */

Definition at line 149 of file hb-ot-layout.hh.

info_cc

#define info_cc

(

info

)

(_hb_glyph_info_get_modified_combining_class (&(info)))

Definition at line 287 of file hb-ot-layout.hh.

IS_LIG_BASE

#define IS_LIG_BASE   0x10

Definition at line 422 of file hb-ot-layout.hh.

lig_props

#define lig_props

(

)

var1.u8[2] /* GSUB/GPOS ligature tracking */

Definition at line 150 of file hb-ot-layout.hh.

syllable

#define syllable

(

)

var1.u8[3] /* GSUB/GPOS shaping boundaries */

Definition at line 151 of file hb-ot-layout.hh.

unicode_props

#define unicode_props

(

)

var2.u16[0]

Definition at line 146 of file hb-ot-layout.hh.

Enumeration Type Documentation

hb_ot_layout_glyph_props_flags_t

enum hb_ot_layout_glyph_props_flags_t

Enumerator
HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH
HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE
HB_OT_LAYOUT_GLYPH_PROPS_MARK
HB_OT_LAYOUT_GLYPH_PROPS_SUBSTITUTED
HB_OT_LAYOUT_GLYPH_PROPS_LIGATED
HB_OT_LAYOUT_GLYPH_PROPS_MULTIPLIED
HB_OT_LAYOUT_GLYPH_PROPS_PRESERVE

Definition at line 76 of file hb-ot-layout.hh.

hb_unicode_props_flags_t

enum hb_unicode_props_flags_t

Enumerator
UPROPS_MASK_GEN_CAT
UPROPS_MASK_IGNORABLE
UPROPS_MASK_HIDDEN
UPROPS_MASK_CONTINUATION
UPROPS_MASK_Cf_ZWJ
UPROPS_MASK_Cf_ZWNJ

Definition at line 195 of file hb-ot-layout.hh.

Function Documentation

HB_MARK_AS_FLAG_T() [1/2]

HB_MARK_AS_FLAG_T

(

hb_ot_layout_glyph_props_flags_t

)

HB_MARK_AS_FLAG_T() [2/2]

HB_MARK_AS_FLAG_T

(

hb_unicode_props_flags_t

)

hb_ot_layout_delete_glyphs_inplace()

HB_INTERNAL void hb_ot_layout_delete_glyphs_inplace	(	hb_buffer_t *	buffer,
		bool(*)(const hb_glyph_info_t *info)	filter
	)

Definition at line 1438 of file hb-ot-layout.cc.

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hb_ot_layout_has_cross_kerning()

HB_INTERNAL bool hb_ot_layout_has_cross_kerning

(

hb_face_t *

face

)

hb_ot_layout_has_cross_kerning: @face: The hb_face_t to work on

Tests whether a face has any cross-stream kerning (i.e., kerns that make adjustments perpendicular to the direction of the text flow: Y adjustments in horizontal text or X adjustments in vertical text) in the 'kern' table.

Does NOT examine the GPOS table.

Return value: true is data found, false otherwise

Definition at line 121 of file hb-ot-layout.cc.

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hb_ot_layout_has_kerning()

HB_INTERNAL bool hb_ot_layout_has_kerning

(

hb_face_t *

face

)

SECTION:hb-ot-layout @title: hb-ot-layout @short_description: OpenType Layout hb-ot.h

Functions for querying OpenType Layout features in the font face. hb_ot_layout_has_kerning: @face: The hb_face_t to work on

Tests whether a face includes any kerning data in the 'kern' table. Does NOT test for kerning lookups in the GPOS table.

Return value: true if data found, false otherwise

Definition at line 85 of file hb-ot-layout.cc.

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hb_ot_layout_has_machine_kerning()

HB_INTERNAL bool hb_ot_layout_has_machine_kerning

(

hb_face_t *

face

)

hb_ot_layout_has_machine_kerning: @face: The hb_face_t to work on

Tests whether a face includes any state-machine kerning in the 'kern' table. Does NOT examine the GPOS table.

Return value: true if data found, false otherwise

Definition at line 101 of file hb-ot-layout.cc.

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hb_ot_layout_kern()

HB_INTERNAL void hb_ot_layout_kern	(	const hb_ot_shape_plan_t *	plan,
		hb_font_t *	font,
		hb_buffer_t *	buffer
	)

Definition at line 127 of file hb-ot-layout.cc.

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hb_ot_layout_position_finish_advances()

HB_INTERNAL void hb_ot_layout_position_finish_advances	(	hb_font_t *	font,
		hb_buffer_t *	buffer
	)

hb_ot_layout_position_finish_advances: @font: hb_font_t to use @buffer: hb_buffer_t buffer to work upon

Called after positioning lookups are performed, to finish glyph advances.

Definition at line 1604 of file hb-ot-layout.cc.

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hb_ot_layout_position_finish_offsets()

HB_INTERNAL void hb_ot_layout_position_finish_offsets	(	hb_font_t *	font,
		hb_buffer_t *	buffer
	)

hb_ot_layout_position_finish_offsets: @font: hb_font_t to use @buffer: hb_buffer_t buffer to work upon

Called after positioning lookups are performed, to finish glyph offsets.

Definition at line 1618 of file hb-ot-layout.cc.

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hb_ot_layout_position_start()

HB_INTERNAL void hb_ot_layout_position_start	(	hb_font_t *	font,
		hb_buffer_t *	buffer
	)

hb_ot_layout_position_start: @font: hb_font_t to use @buffer: hb_buffer_t buffer to work upon

Called before positioning lookups are performed, to ensure that glyph attachment types and glyph-attachment chains are set for the glyphs in the buffer.

Definition at line 1589 of file hb-ot-layout.cc.

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hb_ot_layout_substitute_lookup()

HB_INTERNAL void hb_ot_layout_substitute_lookup	(	OT::hb_ot_apply_context_t *	c,
		const OT::Layout::GSUB::SubstLookup &	lookup,
		const OT::hb_ot_layout_lookup_accelerator_t &	accel
	)

Definition at line 1964 of file hb-ot-layout.cc.

hb_ot_layout_substitute_start()

HB_INTERNAL void hb_ot_layout_substitute_start	(	hb_font_t *	font,
		hb_buffer_t *	buffer
	)

hb_ot_layout_substitute_start: @font: hb_font_t to use @buffer: hb_buffer_t buffer to work upon

Called before substitution lookups are performed, to ensure that glyph class and other properties are set on the glyphs in the buffer.

Definition at line 1431 of file hb-ot-layout.cc.

hb_ot_layout_table_find_feature()

HB_INTERNAL bool hb_ot_layout_table_find_feature	(	hb_face_t *	face,
		hb_tag_t	table_tag,
		hb_tag_t	feature_tag,
		unsigned int *	feature_index
	)

hb_ot_layout_table_find_feature: @face: hb_face_t to work upon @table_tag: HB_OT_TAG_GSUB or HB_OT_TAG_GPOS @feature_tag: The hb_tag_t of the requested feature tag @feature_index: (out): The index of the requested feature

Fetches the index for a given feature tag in the specified face's GSUB table or GPOS table.

Return value: true if the feature is found, false otherwise

Definition at line 634 of file hb-ot-layout.cc.