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Modeless bitmaps

The TDS specifies using utility names as mode names for those utilities which generate bitmaps, e.g., `texmf/fonts/pk/gsftopk/'. An alternative was to introduce a single directory `modeless/' below which all such directories could be gathered. This has the considerable advantage of not requiring each such directory name to be listed in a search path.

But it has disadvantages, too: it would use the last available directory level, preventing any future expansions; and it would put `PK' files at different depths in the tree, possibly hindering search strategies and certainly a likely source of confusion. We decided to stay with existing practice and keep the utility name at the same level as the mode names.

We are making an implicit assumption that METAFONT is the only program producing mode-dependent bitmaps. If this becomes false we could add an abbreviation for the program to mode names, as in `mfcx' vs. `xyzcx' for a hypothetical program Xyz, or we could at that time add an additional program name level uniformly to the tree. For our present purposes, it seems more important to concisely represent the current situation than to take account of hypothetical possibilities that may never be realized.


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