Consider making the glyf table just fit the loaded glyphs

[bstell]

Making the glyf table smaller:

• saves Javascript memory
• reduces the Blob URL transfer time
• requires bulk moves of the glyf data
• requires re-writing the cmaps

[bstell]

A Blob is used for both the SetFont() and idb.put().

Blobs are built from an array of objects. Logically breaking up an ArrrayBuffer could be done using DataView objects for the data before and after the new data. This would eliminate the need to move the bytes in the ArrayBuffer.

[bstell]

For subsequent uses the array of items in the blob can be converted to a single ArrayBuffer:
http://langweiligeszeug.tumblr.com/post/15735711576/arraybuffer-blob-binarystring-conversion