Greg Hitchcock from MS provided some information regarding the gasp
table format, version 1. I'm only listing the differences.
field description
version 1
rangeGaspBehavior bit 3: GASP_SYMMETRIC_SMOOTHING
Use smoothing along multiple axis with
ClearType.
bit 4: GASP_SYMMETRIC_SMOOTHING
Use gridfitting with ClearType symmetric
smoothing.
Bits 0 and 1 (GASP_DOGRAY and GASP_GRIDFIT)
operate independently of bits 2 and 3. If font
smoothing is enabled, then the first two bit
flags are used. If ClearType is enabled, then
the following two bit flags are used.
The version number has been increased to avoid tri-states of the bits
(set, unset, and undefined) due to the introduction of the parallel
interpretation of `rangeGaspBehavior' (this is, with and without
ClearType).
Additionally, bit 13 in the `flags' field of the `head' table got a
meaning:
Font optimized for ClearType. If this flag is cleared, East Asian
fonts in the Windows Presentation Framework (formerly known as
`Avalon') will not be hinted. Setting this flag will enable
hinting.
Werner
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