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OTF CFF cmap / encoding question

New Here ,
Mar 27, 2013 Mar 27, 2013

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I am currently writing the implemenation for subsetting a OTF CFF font. I have written the code to generate the cmap and everything in the CFF data apart from the encoding array. What is confusing me is why there is a need for an encoding array if the cmap is there. Say I have written "hello world" and I will create a subset for those characters from the font e.g.

h = gid 1

e = gid 2

l = gid 3

o = gid 4

etc...

What I have done is create the cmap so that the unicode codes map to those new gid's. Looking at the encoding array though, surely it performs the same task? If I were to have both in my font, would one  take precedence? If I leave out the encoding array from the CFF data in my font, will it correctly use the cmap, or use the StandardEncoding instead? If so, why is the cmap a required table if it is not used for anything with CFF extensions.

Some clarification on this would be helpful.

Thanks

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