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@startuml v5_split_downconvert
title
How to split and down-convert a DesignSpace version 5
<size:14>so that existing tools can work with it
end title
start
#lightgrey:DesignSpace 5.0
- with STAT data
- optional instance names
- with discrete axes
- with multiple VFs]
note left
- STAT data means that compilers will need
to write that data to the ouput TTFs
- optional instance names means that
compilers will need to generate any missing
names using the STAT data
- discrete axes mean that not all sources
are compatible for interpolation
- multiple VFs means that compilers will
need to output several TTFs for one DS
end note
split
split again
:""splitInterpolating()"";
note left
- Create one DS document per interpolating
sub-space, for example: with a discrete
axis for Upright vs Italics, create 2
DesignSpaces, one for the Uprights, and
one for the Italics.
- Expand all missing instance names using
the STAT data.
- Drop all the STAT data because as we start
taking out discrete axes, the sub-documents
lose STAT data anyway (only the full
document at the start of the process should
be used to generate the STAT table)
end note
split
#lightgrey:DesignSpace 5.0
- (no STAT data)
- (explicit instance names)
- (at discrete location #1)
- with multiple VFs]
note left
All sources in this sub-space are
(supposed to be) compatible for
interpolation
end note
split again
#lightgrey:DesignSpace 5.0
- (no STAT data)
- (explicit instance names)
- (at discrete location #2)
- with multiple VFs]
detach
split again
#lightgrey:etc
...]
detach
end split
:check compatibility;
:build compatible master TTFs with cu2qu;
:""splitVariableFonts()"";
note left
Create one DS document per variable font,
for example: the above document may
describe a weight and width space, out of
which we'll build 3 variable fonts:
full weight + width, weight only, width only.
end note
split
#lightgrey:DesignSpace 5.0
- (no STAT data)
- (explicit instance names)
- (at discrete location #1)
- (describing just VF #1)]
note left
This document looks very much
like version 4.1, you can just
change the version number at
the top and feed it to a tool
that doesn't know about v5;
see ""convert5to4()"".
end note
split again
#lightgrey:DesignSpace 5.0
- (no STAT data)
- (explicit instance names)
- (at discrete location #1)
- (describing just VF #2)]
detach
split again
#lightgrey:etc
...]
detach
end split
:""varLib.build()"";
#lightgrey:Variable font TTF
No STAT data]
end split
:""buildVFStatTable()"";
note left
Apply STAT data using the full document
from the start of the process + filtering
entries based on this VF's location
end note
#lightgrey:Variable font TTF
With STAT data]
end
@enduml
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