true type fonts - a negative unsigned int? -


I'm trying to wrap my head around the truetype specification. On the 'cmap' format 4 , the parameter idDelta is listed as an unsigned 16-bit integer (UInt16) in the section. Nevertheless, below are some examples, and here are the values ​​of idDelta-9, -18, -27 and 1. How is this possible?

The definition and usage of idDelta on that page is not compatible. It is defined as the int16 in the Stret subheader , while the first one subtitle is listed as UInt16 * 4 is done.

This is probably a bug in fiction.

If you look at the actual implementation, you will see that idDelta is usually signed: 

  typedef struct SUBHEADER {USHORT firstCode; / * The first valid low byte * for subheaders / USAArt entry quotes; / * Valid low bytes for sub header * / short idDelta; / * To get the base glyph index to the original adder * / USARR IDRR offset; / * Offset for byte off from right * glyphIndexArray * SUBHEADER;   
 Or view implementation with:  
  Strobe subheader {USHORT firstCode; USHORT entry quote; Short ID Delta; USHort IDRR };

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