GlyphIndices属性如何在GlyphRun对象中编码？

Question

I am trying to build a GlyphRun object, and I can't seem to understand how GlyphIndices property is encoded.

For example, the following XAML string creates "hello world". It is obvious that the following rules hold:

• 43 -> h
• 72 -> e
• 79 -> l

But what is this coding scheme? I tried ASCII and it doesn't seem to fit.

Do you have any idea?

---

<GlyphRunDrawing ForegroundBrush="Black">
  <GlyphRunDrawing.GlyphRun>
    <GlyphRun 
      CaretStops="{x:Null}" 
      ClusterMap="{x:Null}" 
      IsSideways="False" 
      GlyphOffsets="{x:Null}" 
      GlyphIndices="43 72 79 79 82 3 58 82 85 79 71" 
      BaselineOrigin="0,12.29"  
      FontRenderingEmSize="13.333333333333334" 
      DeviceFontName="{x:Null}" 
      AdvanceWidths="9.62666666666667 7.41333333333333 2.96 2.96 7.41333333333333 3.70666666666667 12.5866666666667 7.41333333333333 4.44 2.96 7.41333333333333" 
      BidiLevel="0">
      <GlyphRun.GlyphTypeface>
        <GlyphTypeface FontUri="C:\WINDOWS\Fonts\TIMES.TTF" />
      </GlyphRun.GlyphTypeface>
    </GlyphRun>
  </GlyphRunDrawing.GlyphRun>
</GlyphRunDrawing>

Answer 1

Use this code to convert a Unicode code point to a glyph index:

GlyphTypeface glyphTypeface = new GlyphTypeface(new Uri(@"C:\WINDOWS\Fonts\TIMES.TTF"));
const char character = 'и';
ushort glyphIndex;
glyphTypeface.CharacterToGlyphMap.TryGetValue(character, out glyphIndex); 
MessageBox.Show("Index = " + glyphIndex);

The sample above returns 610 for the Cyrillic и character.