Imported Upstream version 1.8.1

[platform/upstream/harfbuzz.git] / src / hb-ot-head-table.hh

diff --git a/src/hb-ot-head-table.hh b/src/hb-ot-head-table.hh
index 3a94512..965e30a 100644 (file)
--- a/src/hb-ot-head-table.hh
+++ b/src/hb-ot-head-table.hh
@@ -31,40 +31,46 @@
 
 #include "hb-open-type-private.hh"
 
-
-namespace OT {
-
-
 /*
  * head -- Font Header
+ * https://docs.microsoft.com/en-us/typography/opentype/spec/head
  */
-
 #define HB_OT_TAG_head HB_TAG('h','e','a','d')
 
+
+namespace OT {
+
+
 struct head
 {
-  static const hb_tag_t Tag    = HB_OT_TAG_head;
+  friend struct OffsetTable;
+
+  static const hb_tag_t tableTag       = HB_OT_TAG_head;
 
-  inline unsigned int get_upem (void) const {
+  inline unsigned int get_upem (void) const
+  {
     unsigned int upem = unitsPerEm;
     /* If no valid head table found, assume 1000, which matches typical Type1 usage. */
     return 16 <= upem && upem <= 16384 ? upem : 1000;
   }
 
-  inline bool sanitize (hb_sanitize_context_t *c) {
+  inline bool sanitize (hb_sanitize_context_t *c) const
+  {
     TRACE_SANITIZE (this);
-    return TRACE_RETURN (c->check_struct (this) && likely (version.major == 1));
+    return_trace (c->check_struct (this) &&
+                 version.major == 1 &&
+                 magicNumber == 0x5F0F3CF5u);
   }
 
   protected:
-  FixedVersion version;                /* Version of the head table--currently
-                                        * 0x00010000 for version 1.0. */
-  FixedVersion fontRevision;           /* Set by font manufacturer. */
-  ULONG                checkSumAdjustment;     /* To compute: set it to 0, sum the
-                                        * entire font as ULONG, then store
-                                        * 0xB1B0AFBA - sum. */
-  ULONG                magicNumber;            /* Set to 0x5F0F3CF5. */
-  USHORT       flags;                  /* Bit 0: Baseline for font at y=0;
+  FixedVersion<>version;               /* Version of the head table--currently
+                                        * 0x00010000u for version 1.0. */
+  FixedVersion<>fontRevision;          /* Set by font manufacturer. */
+  HBUINT32     checkSumAdjustment;     /* To compute: set it to 0, sum the
+                                        * entire font as HBUINT32, then store
+                                        * 0xB1B0AFBAu - sum. */
+  HBUINT32     magicNumber;            /* Set to 0x5F0F3CF5u. */
+  HBUINT16     flags;                  /* Bit 0: Baseline for font at y=0;
                                         * Bit 1: Left sidebearing point at x=0;
                                         * Bit 2: Instructions may depend on point size;
                                         * Bit 3: Force ppem to integer values for all
@@ -72,7 +78,6 @@ struct head
                                         *   ppem sizes if this bit is clear;
                                         * Bit 4: Instructions may alter advance width
                                         *   (the advance widths might not scale linearly);
-
                                         * Bits 5-10: These should be set according to
                                         *   Apple's specification. However, they are not
                                         *   implemented in OpenType.
@@ -92,7 +97,6 @@ struct head
                                         *   contains any strong right-to-left glyphs.
                                         * Bit 10: This bit should be set if the font
                                         *   contains Indic-style rearrangement effects.
-
                                         * Bit 11: Font data is 'lossless,' as a result
                                         *   of having been compressed and decompressed
                                         *   with the Agfa MicroType Express engine.
@@ -110,18 +114,18 @@ struct head
                                         * encoded in the cmap subtables represent proper
                                         * support for those code points.
                                         * Bit 15: Reserved, set to 0. */
-  USHORT       unitsPerEm;             /* Valid range is from 16 to 16384. This value
+  HBUINT16     unitsPerEm;             /* Valid range is from 16 to 16384. This value
                                         * should be a power of 2 for fonts that have
                                         * TrueType outlines. */
   LONGDATETIME created;                /* Number of seconds since 12:00 midnight,
                                           January 1, 1904. 64-bit integer */
   LONGDATETIME modified;               /* Number of seconds since 12:00 midnight,
                                           January 1, 1904. 64-bit integer */
-  SHORT                xMin;                   /* For all glyph bounding boxes. */
-  SHORT                yMin;                   /* For all glyph bounding boxes. */
-  SHORT                xMax;                   /* For all glyph bounding boxes. */
-  SHORT                yMax;                   /* For all glyph bounding boxes. */
-  USHORT       macStyle;               /* Bit 0: Bold (if set to 1);
+  HBINT16      xMin;                   /* For all glyph bounding boxes. */
+  HBINT16      yMin;                   /* For all glyph bounding boxes. */
+  HBINT16      xMax;                   /* For all glyph bounding boxes. */
+  HBINT16      yMax;                   /* For all glyph bounding boxes. */
+  HBUINT16     macStyle;               /* Bit 0: Bold (if set to 1);
                                         * Bit 1: Italic (if set to 1)
                                         * Bit 2: Underline (if set to 1)
                                         * Bit 3: Outline (if set to 1)
@@ -129,16 +133,17 @@ struct head
                                         * Bit 5: Condensed (if set to 1)
                                         * Bit 6: Extended (if set to 1)
                                         * Bits 7-15: Reserved (set to 0). */
-  USHORT       lowestRecPPEM;          /* Smallest readable size in pixels. */
-  SHORT                fontDirectionHint;      /* Deprecated (Set to 2).
+  HBUINT16     lowestRecPPEM;          /* Smallest readable size in pixels. */
+  HBINT16      fontDirectionHint;      /* Deprecated (Set to 2).
                                         * 0: Fully mixed directional glyphs;
                                         * 1: Only strongly left to right;
                                         * 2: Like 1 but also contains neutrals;
                                         * -1: Only strongly right to left;
                                         * -2: Like -1 but also contains neutrals. */
-  SHORT                indexToLocFormat;       /* 0 for short offsets, 1 for long. */
-  SHORT                glyphDataFormat;        /* 0 for current format. */
   public:
+  HBINT16      indexToLocFormat;       /* 0 for short offsets, 1 for long. */
+  HBINT16      glyphDataFormat;        /* 0 for current format. */
+
   DEFINE_SIZE_STATIC (54);
 };