Add hb-ot-hmtx-table.hh

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+/*
+ * Copyright © 2011  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.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#ifndef HB_OT_HMTX_TABLE_HH
+#define HB_OT_HMTX_TABLE_HH
+
+#include "hb-open-type-private.hh"
+
+
+
+/*
+ * hmtx -- The Horizontal Metrics Table
+ */
+
+#define HB_OT_TAG_hmtx HB_TAG('h','m','t','x')
+
+
+struct LongHorMetric
+{
+  USHORT       advanceWidth;
+  SHORT                lsb;
+  public:
+  DEFINE_SIZE_STATIC (4);
+};
+
+struct hmtx
+{
+  static const hb_tag_t Tag    = HB_OT_TAG_hmtx;
+
+  inline bool sanitize (hb_sanitize_context_t *c) {
+    TRACE_SANITIZE ();
+    /* We don't check for anything specific here.  The users of the
+     * struct do all the hard work... */
+    return true;
+  }
+
+  private:
+  LongHorMetric        longHorMetric[VAR];     /* Paired advance width and left side
+                                        * bearing values for each glyph. The
+                                        * value numOfHMetrics comes from
+                                        * the 'hhea' table. If the font is
+                                        * monospaced, only one entry need
+                                        * be in the array, but that entry is
+                                        * required. The last entry applies to
+                                        * all subsequent glyphs. */
+  SHORT                leftSideBearingX[VAR];  /* Here the advanceWidth is assumed
+                                        * to be the same as the advanceWidth
+                                        * for the last entry above. The
+                                        * number of entries in this array is
+                                        * derived from numGlyphs (from 'maxp'
+                                        * table) minus numberOfHMetrics. This
+                                        * generally is used with a run of
+                                        * monospaced glyphs (e.g., Kanji
+                                        * fonts or Courier fonts). Only one
+                                        * run is allowed and it must be at
+                                        * the end. This allows a monospaced
+                                        * font to vary the left side bearing
+                                        * values for each glyph. */
+  public:
+  DEFINE_SIZE_ARRAY2 (0, longHorMetric, leftSideBearingX);
+};
+
+#endif /* HB_OT_HMTX_TABLE_HH */