[gdef] Initial implementation

src/harfbuzz-gdef-private.h

@@ -1,8 +1,148 @@
 #ifndef HARFBUZZ_GDEF_PRIVATE_H
 #define HARFBUZZ_GDEF_PRIVATE_H
 
-#include "harfbuzz-private.h"
-#include "harfbuzz-gdef.h"
+#include "harfbuzz-open-private.h"
 
+struct GDEFHeader {
+  Fixed		version;		/* Version of the GDEF table--initially
+					 * 0x00010000 */
+  Offset	glyphClassDef;		/* Offset to class definition table
+					 * for glyph type--from beginning of
+					 * GDEF header (may be NULL) */
+  Offset	attachList;		/* Offset to list of glyphs with
+					 * attachment points--from beginning
+					 * of GDEF header (may be NULL) */
+  Offset	ligCaretList;		/* Offset to list of positioning points
+					 * for ligature carets--from beginning
+					 * of GDEF header (may be NULL) */
+  Offset	markAttachClassDef;	/* Offset to class definition table for
+					 * mark attachment type--from beginning
+					 * of GDEF header (may be NULL) */
+};
+
+struct GlyphClassDef : ClassDef {
+  static const uint16_t BaseGlyph		= 0x0001u;
+  static const uint16_t LigatureGlyph		= 0x0002u;
+  static const uint16_t MarkGlyph		= 0x0003u;
+  static const uint16_t ComponentGlyph		= 0x0004u;
+};
+
+
+struct AttachList {
+  /* XXX */
+
+  Offset	coverage;		/* Offset to Coverage table -- from
+					 * beginning of AttachList table */
+  USHORT	glyphCount;		/* Number of glyphs with attachment
+					 * points */
+  Offset	attachPoint[];		/* Array of offsets to AttachPoint
+					 * tables--from beginning of AttachList
+					 * table--in Coverage Index order */
+};
+
+struct AttachPoint {
+  /* XXX */
+
+  USHORT	pointCount;		/* Number of attachment points on
+					 * this glyph */
+  USHORT	pointIndex[];		/* Array of contour point indices--in
+					 * increasing numerical order */
+};
+
+/*
+ * Ligature Caret Table
+ */
+
+struct CaretValue;
+
+struct LigCaretList {
+  /* XXX */
+
+  Offset	coverage;		/* Offset to Coverage table--from
+					 * beginning of LigCaretList table */
+  USHORT	ligGlyphCount;		/* Number of ligature glyphs */
+  Offset	ligGlyph[];		/* Array of offsets to LigGlyph
+					 * tables--from beginning of
+					 * LigCaretList table--in Coverage
+					 * Index order */
+};
+
+struct LigGlyph {
+  /* Caret value tables, in increasing coordinate order */
+  DEFINE_OFFSET_ARRAY_TYPE (CaretValue, caretValue, caretCount);
+  /* XXX */
+
+  USHORT	caretCount;		/* Number of CaretValues for this
+					 * ligature (components - 1) */
+  Offset	caretValue[];		/* Array of offsets to CaretValue
+					 * tables--from beginning of LigGlyph
+					 * table--in increasing coordinate
+					 * order */
+};
+
+struct CaretValueFormat1 {
+  USHORT	caretValueFormat;	/* Format identifier--format = 1 */
+  SHORT		coordinate;		/* X or Y value, in design units */
+
+  inline int get_caret_value (int ppem) const {
+    return /* XXX garbage */ coordinate / ppem;
+  }
+};
+
+struct CaretValueFormat2 {
+  USHORT	caretValueFormat;	/* Format identifier--format = 2 */
+  USHORT	caretValuePoint;	/* Contour point index on glyph */
+
+  inline int get_caret_value (int ppem) const {
+    return /* XXX garbage */ 0 / ppem;
+  }
+};
+
+struct CaretValueFormat3 {
+  inline const Device* get_device (void) const {
+    return (const Device*)((const char*)this + deviceTable);
+  }
+
+  USHORT	caretValueFormat;	/* Format identifier--format = 3 */
+  SHORT		coordinate;		/* X or Y value, in design units */
+  Offset	deviceTable;		/* Offset to Device table for X or Y
+					 * value--from beginning of CaretValue
+					 * table */
+
+  inline int get_caret_value (int ppem) const {
+    return /* XXX garbage */ (coordinate + get_device()->get_delta (ppem)) / ppem;
+  }
+};
+
+struct CaretValue {
+  DEFINE_NON_INSTANTIABLE(CaretValue);
+
+  inline unsigned int get_size (void) const {
+    switch (u.caretValueFormat) {
+    case 1: return sizeof (u.format1);
+    case 2: return sizeof (u.format2);
+    case 3: return sizeof (u.format3);
+    default:return sizeof (u.caretValueFormat);
+    }
+  }
+
+  /* XXX  we need access to a load-contour-point vfunc here */
+  inline int get_caret_value (int ppem) const {
+    switch (u.caretValueFormat) {
+    case 1: return u.format1.get_caret_value(ppem);
+    case 2: return u.format2.get_caret_value(ppem);
+    case 3: return u.format3.get_caret_value(ppem);
+    default:return 0;
+    }
+  }
+
+  union {
+  USHORT	caretValueFormat;	/* Format identifier */
+  CaretValueFormat1	format1;
+  CaretValueFormat2	format2;
+  CaretValueFormat3	format3;
+  /* XXX old HarfBuzz code has a format 4 here! */
+  } u;
+};
 
 #endif /* HARFBUZZ_GDEF_PRIVATE_H */