Roll Chrome into Mojo.

third_party/harfbuzz-ng/src/hb-ot-hhea-table.hh

 /*
  * Copyright © 2011,2012  Google, Inc.
  *
  *  This is part of HarfBuzz, a text shaping library.
  *
  * Permission is hereby granted, without written agreement and without
  * license or royalty fees, to use, copy, modify, and distribute this
  * software and its documentation for any purpose, provided that the
  * above copyright notice and the following two paragraphs appear in
  * all copies of this software.
@@ skipping 17 matching lines @@
 #define HB_OT_HHEA_TABLE_HH
 
 #include "hb-open-type-private.hh"
 
 
 namespace OT {
 
 
 /*
  * hhea -- The Horizontal Header Table
+ * vhea -- The Vertical Header Table
  */
 
 #define HB_OT_TAG_hhea HB_TAG('h','h','e','a')
+#define HB_OT_TAG_vhea HB_TAG('v','h','e','a')
 
 
-struct hhea
+struct _hea
 {
-  static const hb_tag_t tableTag        = HB_OT_TAG_hhea;
+  static const hb_tag_t tableTag = HB_TAG('_','h','e','a');
+
+  static const hb_tag_t hheaTag = HB_OT_TAG_hhea;
+  static const hb_tag_t vheaTag = HB_OT_TAG_vhea;
 
   inline bool sanitize (hb_sanitize_context_t *c) {
     TRACE_SANITIZE (this);
     return TRACE_RETURN (c->check_struct (this) && likely (version.major == 1));
   }
 
   public:
   FixedVersion  version;                /* 0x00010000u for version 1.0. */
-  FWORD         ascender;               /* Typographic ascent. <a
-                                         * href="http://developer.apple.com/fonts/TTRefMan/RM06/Chap6hhea.html">
-                                         * (Distance from baseline of highest
-                                         * ascender)</a> */
-  FWORD         descender;              /* Typographic descent. <a
-                                         * href="http://developer.apple.com/fonts/TTRefMan/RM06/Chap6hhea.html">
-                                         * (Distance from baseline of lowest
-                                         * descender)</a> */
-  FWORD         lineGap;                /* Typographic line gap. Negative
-                                         * LineGap values are treated as zero
-                                         * in Windows 3.1, System 6, and
-                                         * System 7. */
-  UFWORD        advanceWidthMax;        /* Maximum advance width value in
-                                         * 'hmtx' table. */
-  FWORD         minLeftSideBearing;     /* Minimum left sidebearing value in
-                                         * 'hmtx' table. */
-  FWORD         minRightSideBearing;    /* Minimum right sidebearing value;
+  FWORD         ascender;               /* Typographic ascent. */
+  FWORD         descender;              /* Typographic descent. */
+  FWORD         lineGap;                /* Typographic line gap. */
+  UFWORD        advanceMax;             /* Maximum advance width/height value in
+                                         * metrics table. */
+  FWORD         minLeadingBearing;      /* Minimum left/top sidebearing value in
+                                         * metrics table. */
+  FWORD         minTrailingBearing;     /* Minimum right/bottom sidebearing value;
                                          * calculated as Min(aw - lsb -
-                                         * (xMax - xMin)). */
-  FWORD         xMaxExtent;             /* Max(lsb + (xMax - xMin)). */
+                                         * (xMax - xMin)) for horizontal. */
+  FWORD         maxExtent;              /* horizontal: Max(lsb + (xMax - xMin)),
+                                         * vertical: minLeadingBearing+(yMax-yMin). */
   SHORT         caretSlopeRise;         /* Used to calculate the slope of the
-                                         * cursor (rise/run); 1 for vertical. */
-  SHORT         caretSlopeRun;          /* 0 for vertical. */
+                                         * cursor (rise/run); 1 for vertical caret,
+                                         * 0 for horizontal.*/
+  SHORT         caretSlopeRun;          /* 0 for vertical caret, 1 for horizontal. */
   SHORT         caretOffset;            /* The amount by which a slanted
                                          * highlight on a glyph needs
                                          * to be shifted to produce the
                                          * best appearance. Set to 0 for
-                                         * non--slanted fonts */
-  SHORT         reserved1;              /* set to 0 */
-  SHORT         reserved2;              /* set to 0 */
-  SHORT         reserved3;              /* set to 0 */
-  SHORT         reserved4;              /* set to 0 */
+                                         * non-slanted fonts. */
+  SHORT         reserved1;              /* Set to 0. */
+  SHORT         reserved2;              /* Set to 0. */
+  SHORT         reserved3;              /* Set to 0. */
+  SHORT         reserved4;              /* Set to 0. */
   SHORT         metricDataFormat;       /* 0 for current format. */
-  USHORT        numberOfHMetrics;       /* Number of hMetric entries in 'hmtx'
-                                         * table */
+  USHORT        numberOfLongMetrics;    /* Number of LongMetric entries in metric
+                                         * table. */
   public:
   DEFINE_SIZE_STATIC (36);
 };
 
+struct hhea : _hea {
+  static const hb_tag_t tableTag        = HB_OT_TAG_hhea;
+};
+struct vhea : _hea {
+  static const hb_tag_t tableTag        = HB_OT_TAG_vhea;
+};
+
 
 } /* namespace OT */
 
 
 #endif /* HB_OT_HHEA_TABLE_HH */