private int GetShapeableSymbolsWidth(TextShapeableSymbols textRun)
{
int result = 0;
int text_length = textRun.Length;
int[] advance_widths = new int[text_length];
GCHandle pin_handle;
CharacterBuffer char_buf = textRun.CharacterBufferReference.CharacterBuffer;
unsafe
{
IntPtr run_characters = char_buf.PinAndGetCharacterPointer(textRun.CharacterBufferReference.OffsetToFirstChar, out pin_handle);
try
{
fixed(int *widths_ptr = advance_widths)
{
textRun.GetAdvanceWidthsUnshaped((char *)run_characters.ToPointer(), text_length, TextFormatterImp.ToIdeal, widths_ptr);
}
}
finally
{
char_buf.UnpinCharacterPointer(pin_handle);
}
}
for (int i = 0; i < text_length; i++)
{
result += advance_widths[i];
}
return(result);
}