[gdef] Initial implementation
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#ifndef HARFBUZZ_GDEF_PRIVATE_H
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#define HARFBUZZ_GDEF_PRIVATE_H
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#include "harfbuzz-private.h"
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#include "harfbuzz-gdef.h"
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#include "harfbuzz-open-private.h"
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struct GDEFHeader {
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Fixed version; /* Version of the GDEF table--initially
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* 0x00010000 */
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Offset glyphClassDef; /* Offset to class definition table
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* for glyph type--from beginning of
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* GDEF header (may be NULL) */
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Offset attachList; /* Offset to list of glyphs with
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* attachment points--from beginning
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* of GDEF header (may be NULL) */
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Offset ligCaretList; /* Offset to list of positioning points
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* for ligature carets--from beginning
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* of GDEF header (may be NULL) */
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Offset markAttachClassDef; /* Offset to class definition table for
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* mark attachment type--from beginning
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* of GDEF header (may be NULL) */
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};
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struct GlyphClassDef : ClassDef {
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static const uint16_t BaseGlyph = 0x0001u;
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static const uint16_t LigatureGlyph = 0x0002u;
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static const uint16_t MarkGlyph = 0x0003u;
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static const uint16_t ComponentGlyph = 0x0004u;
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};
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struct AttachList {
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/* XXX */
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Offset coverage; /* Offset to Coverage table -- from
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* beginning of AttachList table */
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USHORT glyphCount; /* Number of glyphs with attachment
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* points */
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Offset attachPoint[]; /* Array of offsets to AttachPoint
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* tables--from beginning of AttachList
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* table--in Coverage Index order */
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};
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struct AttachPoint {
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/* XXX */
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USHORT pointCount; /* Number of attachment points on
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* this glyph */
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USHORT pointIndex[]; /* Array of contour point indices--in
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* increasing numerical order */
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};
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/*
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* Ligature Caret Table
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*/
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struct CaretValue;
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struct LigCaretList {
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/* XXX */
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Offset coverage; /* Offset to Coverage table--from
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* beginning of LigCaretList table */
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USHORT ligGlyphCount; /* Number of ligature glyphs */
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Offset ligGlyph[]; /* Array of offsets to LigGlyph
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* tables--from beginning of
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* LigCaretList table--in Coverage
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* Index order */
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};
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struct LigGlyph {
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/* Caret value tables, in increasing coordinate order */
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DEFINE_OFFSET_ARRAY_TYPE (CaretValue, caretValue, caretCount);
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/* XXX */
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USHORT caretCount; /* Number of CaretValues for this
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* ligature (components - 1) */
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Offset caretValue[]; /* Array of offsets to CaretValue
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* tables--from beginning of LigGlyph
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* table--in increasing coordinate
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* order */
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};
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struct CaretValueFormat1 {
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USHORT caretValueFormat; /* Format identifier--format = 1 */
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SHORT coordinate; /* X or Y value, in design units */
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inline int get_caret_value (int ppem) const {
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return /* XXX garbage */ coordinate / ppem;
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}
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};
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struct CaretValueFormat2 {
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USHORT caretValueFormat; /* Format identifier--format = 2 */
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USHORT caretValuePoint; /* Contour point index on glyph */
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inline int get_caret_value (int ppem) const {
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return /* XXX garbage */ 0 / ppem;
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}
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};
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struct CaretValueFormat3 {
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inline const Device* get_device (void) const {
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return (const Device*)((const char*)this + deviceTable);
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}
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USHORT caretValueFormat; /* Format identifier--format = 3 */
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SHORT coordinate; /* X or Y value, in design units */
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Offset deviceTable; /* Offset to Device table for X or Y
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* value--from beginning of CaretValue
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* table */
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inline int get_caret_value (int ppem) const {
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return /* XXX garbage */ (coordinate + get_device()->get_delta (ppem)) / ppem;
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}
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};
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struct CaretValue {
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DEFINE_NON_INSTANTIABLE(CaretValue);
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inline unsigned int get_size (void) const {
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switch (u.caretValueFormat) {
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case 1: return sizeof (u.format1);
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case 2: return sizeof (u.format2);
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case 3: return sizeof (u.format3);
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default:return sizeof (u.caretValueFormat);
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}
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}
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/* XXX we need access to a load-contour-point vfunc here */
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inline int get_caret_value (int ppem) const {
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switch (u.caretValueFormat) {
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case 1: return u.format1.get_caret_value(ppem);
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case 2: return u.format2.get_caret_value(ppem);
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case 3: return u.format3.get_caret_value(ppem);
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default:return 0;
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}
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}
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union {
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USHORT caretValueFormat; /* Format identifier */
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CaretValueFormat1 format1;
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CaretValueFormat2 format2;
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CaretValueFormat3 format3;
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/* XXX old HarfBuzz code has a format 4 here! */
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} u;
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};
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#endif /* HARFBUZZ_GDEF_PRIVATE_H */
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