[pango/harfbuzz-ng] [HB] Add ArrayOf<>

[Behdad Esfahbod <behdad src gnome org>]

commit 3d6f115c751830cff0b7389ae6e0c33322f1dcce
Author: Behdad Esfahbod <behdad behdad org>
Date:   Sun May 17 00:54:25 2009 -0400

    [HB] Add ArrayOf<>
---
 pango/opentype/hb-ot-layout-gdef-private.h |   62 +++++-----------------
 pango/opentype/hb-ot-layout-open-private.h |   77 ++++++++++++++++++++-------
 2 files changed, 71 insertions(+), 68 deletions(-)

diff --git a/pango/opentype/hb-ot-layout-gdef-private.h b/pango/opentype/hb-ot-layout-gdef-private.h
index f5de2b8..989c294 100644
--- a/pango/opentype/hb-ot-layout-gdef-private.h
+++ b/pango/opentype/hb-ot-layout-gdef-private.h
@@ -32,9 +32,9 @@
 #include "hb-ot-layout-open-private.h"
 
 
-#define DEFINE_INDIRECT_GLYPH_ARRAY_LOOKUP(Type, name) \
+#define DEFINE_INDIRECT_GLYPH_ARRAY_LOOKUP(Type, array, name) \
   inline const Type& name (hb_codepoint_t glyph) { \
-    return (*this)[(this+coverage)(glyph)]; \
+    return this+array[(this+coverage)(glyph)]; \
   }
 
 
@@ -50,42 +50,23 @@ struct GlyphClassDef : ClassDef {
  */
 
 struct AttachPoint {
-
-  friend struct AttachList;
-
-  private:
-  /* countour point indices, in increasing numerical order */
-  DEFINE_ARRAY_TYPE (USHORT, pointIndex, pointCount);
-
-  private:
-  USHORT	pointCount;		/* Number of attachment points on
-					 * this glyph */
-  USHORT	pointIndex[];		/* Array of contour point indices--in
+  Array		pointIndex;		/* Array of contour point indices--in
 					 * increasing numerical order */
 };
 ASSERT_SIZE (AttachPoint, 2);
 
 struct AttachList {
 
-  friend struct GDEF;
-
-  private:
   /* const AttachPoint& get_attach_points (hb_codepoint_t glyph); */
-  DEFINE_INDIRECT_GLYPH_ARRAY_LOOKUP (AttachPoint, get_attach_points);
-
-  private:
-  /* AttachPoint tables, in Coverage Index order */
-  DEFINE_OFFSET_ARRAY_TYPE (AttachPoint, attachPoint, glyphCount);
+  DEFINE_INDIRECT_GLYPH_ARRAY_LOOKUP (AttachPoint, attachPoint, get_attach_points);
 
  private:
   OffsetTo<Coverage>
 		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 */
+  OffsetArrayOf<AttachPoint>
+		attachPoint;		/* Array of AttachPoint tables
+					 * in Coverage Index order */
 };
 ASSERT_SIZE (AttachList, 4);
 
@@ -171,18 +152,9 @@ struct LigGlyph {
 
   friend struct LigCaretList;
 
-  private:
-  /* Caret value tables, in increasing coordinate order */
-  DEFINE_OFFSET_ARRAY_TYPE (CaretValue, caretValue, caretCount);
-  /* TODO */
-
-  private:
-  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 */
+  OffsetArrayOf<CaretValue>
+		caret;			/* Array of CaretValue tables
+					 * in increasing coordinate order */
 };
 ASSERT_SIZE (LigGlyph, 2);
 
@@ -192,21 +164,15 @@ struct LigCaretList {
 
   private:
   /* const LigGlyph& get_lig_glyph (hb_codepoint_t glyph); */
-  DEFINE_INDIRECT_GLYPH_ARRAY_LOOKUP (LigGlyph, get_lig_glyph);
-
-  private:
-  /* LigGlyph tables, in Coverage Index order */
-  DEFINE_OFFSET_ARRAY_TYPE (LigGlyph, ligGlyph, ligGlyphCount);
+  DEFINE_INDIRECT_GLYPH_ARRAY_LOOKUP (LigGlyph, ligGlyph, get_lig_glyph);
 
   private:
   OffsetTo<Coverage>
 		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 */
+  OffsetArrayOf<LigGlyph>
+		ligGlyph;		/* Array of LigGlyph tables
+					 * in Coverage Index order */
 };
 ASSERT_SIZE (LigCaretList, 4);
 
diff --git a/pango/opentype/hb-ot-layout-open-private.h b/pango/opentype/hb-ot-layout-open-private.h
index f68e59f..e11bb90 100644
--- a/pango/opentype/hb-ot-layout-open-private.h
+++ b/pango/opentype/hb-ot-layout-open-private.h
@@ -41,26 +41,6 @@
 
 
 /*
- * Int types
- */
-
-/* XXX define these as structs of chars on machines that do not allow
- * unaligned access (using templates?). */
-#define DEFINE_INT_TYPE1(NAME, TYPE, BIG_ENDIAN) \
-  inline NAME& operator = (TYPE i) { v = BIG_ENDIAN(i); return *this; } \
-  inline operator TYPE(void) const { return BIG_ENDIAN(v); } \
-  inline bool operator== (NAME o) const { return v == o.v; } \
-  private: TYPE v; \
-  public:
-#define DEFINE_INT_TYPE0(NAME, type) DEFINE_INT_TYPE1 (NAME, type, hb_be_##type)
-#define DEFINE_INT_TYPE(NAME, u, w)  DEFINE_INT_TYPE0 (NAME, u##int##w##_t)
-#define DEFINE_INT_TYPE_STRUCT(NAME, u, w) \
-  struct NAME { \
-    DEFINE_INT_TYPE(NAME, u, w) \
-  }; \
-  ASSERT_SIZE (NAME, w / 8)
-
-/*
  * Array types
  */
 
@@ -254,6 +234,26 @@ struct Null <Type> { \
 /* "The following data types are used in the OpenType font file.
  *  All OpenType fonts use Motorola-style byte ordering (Big Endian):" */
 
+/*
+ * Int types
+ */
+
+/* XXX define these as structs of chars on machines that do not allow
+ * unaligned access (using templates?). */
+#define DEFINE_INT_TYPE1(NAME, TYPE, BIG_ENDIAN) \
+  inline NAME& operator = (TYPE i) { v = BIG_ENDIAN(i); return *this; } \
+  inline operator TYPE(void) const { return BIG_ENDIAN(v); } \
+  inline bool operator== (NAME o) const { return v == o.v; } \
+  private: TYPE v; \
+  public:
+#define DEFINE_INT_TYPE0(NAME, type) DEFINE_INT_TYPE1 (NAME, type, hb_be_##type)
+#define DEFINE_INT_TYPE(NAME, u, w)  DEFINE_INT_TYPE0 (NAME, u##int##w##_t)
+#define DEFINE_INT_TYPE_STRUCT(NAME, u, w) \
+  struct NAME { \
+    DEFINE_INT_TYPE(NAME, u, w) \
+  }; \
+  ASSERT_SIZE (NAME, w / 8)
+
 
 DEFINE_INT_TYPE_STRUCT (BYTE,	 u,  8);	/*  8-bit unsigned integer. */
 DEFINE_INT_TYPE_STRUCT (CHAR,	  ,  8);	/*  8-bit signed integer. */
@@ -371,6 +371,43 @@ struct Fixed_Version : Fixed {
 };
 ASSERT_SIZE (Fixed_Version, 4);
 
+/*
+ * Array Types
+ */
+
+/* An array with a USHORT number of elements. */
+template <typename Type>
+struct ArrayOf {
+  inline const Type& operator [] (unsigned int i) const {
+    if (HB_UNLIKELY (i >= len)) return Null(Type);
+    return array[i];
+  }
+
+  USHORT len;
+  private:
+  Type array[];
+};
+
+/* Array of USHORT's */
+typedef ArrayOf<USHORT> Array;
+
+/* Array of Offset's */
+template <typename Type>
+struct OffsetArrayOf : ArrayOf<OffsetTo<Type> > {
+};
+
+/* An array type is one that contains a variable number of objects
+ * as its last item.  An array object is extended with get_len()
+ * methods, as well as overloaded [] operator. */
+#define DEFINE_ARRAY_TYPE(Type, array, num) \
+  DEFINE_INDEX_OPERATOR(Type, array, num) \
+  DEFINE_LEN(Type, array, num)
+#define DEFINE_INDEX_OPERATOR(Type, array, num) \
+  inline const Type& operator[] (unsigned int i) const { \
+    if (HB_UNLIKELY (i >= num)) return Null(Type); \
+    return array[i]; \
+  }
+
 
 /*
  * Organization of an OpenType Font