// Copyright (c) Six Labors.
// Licensed under the Six Labors Split License.

namespace SixLabors.Fonts.Tables.AdvancedTypographic {
  /// <summary>
  /// The GSUB and GPOS tables use the Glyph Class Definition table (GlyphClassDef) to identify which glyph classes to adjust with lookups.
  /// <see href="https://docs.microsoft.com/en-us/typography/opentype/spec/gdef#glyph-class-definition-table"/>
  /// </summary>
  public enum GlyphClassDef
  {
      /// <summary>
      /// Base glyph (single character, spacing glyph).
      /// </summary>
      BaseGlyph = 1,

      /// <summary>
      /// Ligature glyph (multiple character, spacing glyph).
      /// </summary>
      LigatureGlyph = 2,

      /// <summary>
      /// Mark glyph (non-spacing combining glyph).
      /// </summary>
      MarkGlyph = 3,

      /// <summary>
      /// Component glyph (part of single character, spacing glyph).
      /// </summary>
      ComponentGlyph = 4,
  }
}