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/*******************************************************************
*
* Copyright 2007 Trolltech ASA
*
* This is part of HarfBuzz, an OpenType Layout engine library.
*
* See the file name COPYING for licensing information.
*
******************************************************************/
#ifndef HARFBUZZ_SHAPER_H
#define HARFBUZZ_SHAPER_H
#include <harfbuzz.h>
HB_BEGIN_HEADER
typedef enum {
HB_Script_Common,
HB_Script_Greek,
HB_Script_Cyrillic,
HB_Script_Armenian,
HB_Script_Hebrew,
HB_Script_Arabic,
HB_Script_Syriac,
HB_Script_Thaana,
HB_Script_Devanagari,
HB_Script_Bengali,
HB_Script_Gurmukhi,
HB_Script_Gujarati,
HB_Script_Oriya,
HB_Script_Tamil,
HB_Script_Telugu,
HB_Script_Kannada,
HB_Script_Malayalam,
HB_Script_Sinhala,
HB_Script_Thai,
HB_Script_Lao,
HB_Script_Tibetan,
HB_Script_Myanmar,
HB_Script_Georgian,
HB_Script_Hangul,
HB_Script_Ogham,
HB_Script_Runic,
HB_Script_Khmer,
HB_Script_Inherited,
HB_ScriptCount = HB_Script_Inherited
/*
HB_Script_Latin = Common,
HB_Script_Ethiopic = Common,
HB_Script_Cherokee = Common,
HB_Script_CanadianAboriginal = Common,
HB_Script_Mongolian = Common,
HB_Script_Hiragana = Common,
HB_Script_Katakana = Common,
HB_Script_Bopomofo = Common,
HB_Script_Han = Common,
HB_Script_Yi = Common,
HB_Script_OldItalic = Common,
HB_Script_Gothic = Common,
HB_Script_Deseret = Common,
HB_Script_Tagalog = Common,
HB_Script_Hanunoo = Common,
HB_Script_Buhid = Common,
HB_Script_Tagbanwa = Common,
HB_Script_Limbu = Common,
HB_Script_TaiLe = Common,
HB_Script_LinearB = Common,
HB_Script_Ugaritic = Common,
HB_Script_Shavian = Common,
HB_Script_Osmanya = Common,
HB_Script_Cypriot = Common,
HB_Script_Braille = Common,
HB_Script_Buginese = Common,
HB_Script_Coptic = Common,
HB_Script_NewTaiLue = Common,
HB_Script_Glagolitic = Common,
HB_Script_Tifinagh = Common,
HB_Script_SylotiNagri = Common,
HB_Script_OldPersian = Common,
HB_Script_Kharoshthi = Common,
HB_Script_Balinese = Common,
HB_Script_Cuneiform = Common,
HB_Script_Phoenician = Common,
HB_Script_PhagsPa = Common,
HB_Script_Nko = Common
*/
} HB_Script;
typedef struct
{
uint32_t pos;
uint32_t length;
HB_Script script;
uint8_t bidiLevel;
} HB_ScriptItem;
typedef enum {
HB_NoBreak,
HB_SoftHyphen,
HB_Break,
HB_ForcedBreak
} HB_LineBreakType;
typedef struct {
HB_LineBreakType lineBreakType :2;
HB_Bool whiteSpace :1; // A unicode whitespace character, except NBSP, ZWNBSP
HB_Bool charStop :1; // Valid cursor position (for left/right arrow)
uint8_t unused :4;
} HB_CharAttributes;
void HB_GetCharAttributes(const HB_UChar16 *string, uint32_t stringLength,
const HB_ScriptItem *items, uint32_t numItems,
HB_CharAttributes *attributes);
typedef enum {
HB_LeftToRight = 0,
HB_RightToLeft = 1
} HB_StringToGlyphsFlags;
typedef enum {
HB_ShaperFlag_Default = 0,
HB_ShaperFlag_NoKerning = 1,
HB_ShaperFlag_UseDesignMetrics = 2
} HB_ShaperFlag;
// highest value means highest priority for justification. Justification is done by first inserting kashidas
// starting with the highest priority positions, then stretching spaces, afterwards extending inter char
// spacing, and last spacing between arabic words.
// NoJustification is for example set for arabic where no Kashida can be inserted or for diacritics.
typedef enum {
HB_NoJustification= 0, // Justification can't be applied after this glyph
HB_Arabic_Space = 1, // This glyph represents a space inside arabic text
HB_Character = 2, // Inter-character justification point follows this glyph
HB_Space = 4, // This glyph represents a blank outside an Arabic run
HB_Arabic_Normal = 7, // Normal Middle-Of-Word glyph that connects to the right (begin)
HB_Arabic_Waw = 8, // Next character is final form of Waw/Ain/Qaf/Fa
HB_Arabic_BaRa = 9, // Next two chars are Ba + Ra/Ya/AlefMaksura
HB_Arabic_Alef = 10, // Next character is final form of Alef/Tah/Lam/Kaf/Gaf
HB_Arabic_HaaDal = 11, // Next character is final form of Haa/Dal/Taa Marbutah
HB_Arabic_Seen = 12, // Initial or Medial form Of Seen/Sad
HB_Arabic_Kashida = 13 // Kashida(U+640) in middle of word
} HB_JustificationClass;
typedef struct {
unsigned short justification :4; // Justification class
unsigned short clusterStart :1; // First glyph of representation of cluster
unsigned short mark :1; // needs to be positioned around base char
unsigned short zeroWidth :1; // ZWJ, ZWNJ etc, with no width
unsigned short dontPrint :1;
unsigned short combiningClass :8;
} HB_GlyphAttributes;
typedef struct {
HB_Bool isSymbolFont;
HB_GDEF gdef;
HB_GSUB gsub;
HB_GPOS gpos;
HB_Bool supported_scripts[HB_ScriptCount];
HB_Buffer buffer;
HB_Script current_script;
int current_flags; // HB_ShaperFlags
HB_Bool has_opentype_kerning;
HB_Bool glyphs_substituted;
HB_GlyphAttributes *tmpAttributes;
unsigned int *tmpLogClusters;
int length;
int orig_nglyphs;
} HB_FaceRec, *HB_Face;
HB_Face HB_NewFace(HB_Font font);
void HB_FreeFace(HB_Face face);
typedef struct {
HB_Bool (*stringToGlyphs)(HB_Font font, const HB_UChar16 *string, uint32_t length, HB_Glyph *glyphs, uint32_t *numGlyphs, HB_Bool rightToLeft);
void (*getAdvances)(HB_Font font, const HB_Glyph *glyphs, int numGlyphs, HB_Fixed *advances, int flags /*HB_ShaperFlag*/);
HB_Bool (*canRender)(HB_Font font, const HB_UChar16 *string, uint32_t length);
HB_Stream (*getSFntTable)(HB_Font font, HB_Tag tag);
HB_Error (*getPointInOutline)(HB_Font font, HB_Glyph glyph, int load_flags, uint32_t point, HB_Fixed *xpos, HB_Fixed *ypos, uint32_t *nPoints);
} HB_FontClass;
typedef struct HB_Font_ {
const HB_FontClass *klass;
FT_Face freetypeFace;
void *userData;
} HB_FontRec;
typedef struct {
const HB_UChar16 *string;
uint32_t stringLength;
HB_ScriptItem item;
HB_Font font;
HB_Face face;
int shaperFlags; // HB_ShaperFlags
uint32_t num_glyphs; // in: available glyphs out: glyphs used/needed
HB_Glyph *glyphs; // out parameter
HB_GlyphAttributes *attributes; // out
HB_Fixed *advances; // out
HB_FixedPoint *offsets; // out
unsigned short *log_clusters; // out
// internal
HB_Bool kerning_applied; // out: kerning applied by shaper
} HB_ShaperItem;
HB_Bool HB_ShapeItem(HB_ShaperItem *item);
HB_END_HEADER
#endif // HARFBUZZ_SHAPER_H
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