Roll HarfBuzz to 1.4.6

third_party/harfbuzz-ng/src/hb-ot-var-mvar-table.hh

+/*
+ * Copyright © 2017  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_VAR_MVAR_TABLE_HH
+#define HB_OT_VAR_MVAR_TABLE_HH
+
+#include "hb-ot-layout-common-private.hh"
+
+
+namespace OT {
+
+
+struct VariationValueRecord
+{
+  inline bool sanitize (hb_sanitize_context_t *c) const
+  {
+    TRACE_SANITIZE (this);
+    return_trace (c->check_struct (this));
+  }
+
+  public:
+  Tag           valueTag;       /* Four-byte tag identifying a font-wide measure. */
+  ULONG         varIdx;         /* Outer/inner index into VariationStore item. */
+
+  public:
+  DEFINE_SIZE_STATIC (8);
+};
+
+
+/*
+ * MVAR -- Metrics Variations Table
+ */
+
+#define HB_OT_TAG_MVAR HB_TAG('M','V','A','R')
+
+struct MVAR
+{
+  static const hb_tag_t tableTag        = HB_OT_TAG_MVAR;
+
+  inline bool sanitize (hb_sanitize_context_t *c) const
+  {
+    TRACE_SANITIZE (this);
+    return_trace (version.sanitize (c) &&
+                  likely (version.major == 1) &&
+                  c->check_struct (this) &&
+                  valueRecordSize >= VariationValueRecord::static_size &&
+                  varStore.sanitize (c, this) &&
+                  c->check_array (values, valueRecordSize, valueRecordCount));
+  }
+
+  inline float get_var (hb_tag_t tag,
+                        int *coords, unsigned int coord_count) const
+  {
+    const VariationValueRecord *record;
+    record = (VariationValueRecord *) bsearch (&tag, values,
+                                               valueRecordCount, valueRecordSize,
+                                               (hb_compare_func_t) tag_compare);
+    if (!record)
+      return 0.;
+
+    return (this+varStore).get_delta (record->varIdx, coords, coord_count);
+  }
+
+protected:
+  static inline int tag_compare (const hb_tag_t *a, const Tag *b)
+  { return b->cmp (*a); }
+
+  protected:
+  FixedVersion<>version;        /* Version of the metrics variation table
+                                 * initially set to 0x00010000u */
+  USHORT        reserved;       /* Not used; set to 0. */
+  USHORT        valueRecordSize;/* The size in bytes of each value record —
+                                 * must be greater than zero. */
+  USHORT        valueRecordCount;/* The number of value records — may be zero. */
+  OffsetTo<VariationStore>
+                varStore;       /* Offset to item variation store table. */
+  BYTE          values[VAR];    /* Array of value records. The records must be
+                                 * in binary order of their valueTag field. */
+
+  public:
+  DEFINE_SIZE_ARRAY (12, values);
+};
+
+} /* namespace OT */
+
+
+#endif /* HB_OT_VAR_MVAR_TABLE_HH */