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[ft-devel] Dynamic limits for TrueType bytecode execution
From: |
Werner LEMBERG |
Subject: |
[ft-devel] Dynamic limits for TrueType bytecode execution |
Date: |
Tue, 27 Sep 2016 09:15:20 +0200 (CEST) |
>From the CHANGES file:
- Some limits for TrueType bytecode execution have been tightened
to speed up FreeType's handling of malformed fonts, in
particular to quickly abort endless loops.
- The number of twilight points can no longer be set to an
arbitrarily large value.
- The total number of jump opcode instructions (like JMPR) with
negative arguments is dynamically restricted; the same holds
for the total number of iterations in LOOPCALL opcodes.
The dynamic limits are based on the number of points in a glyph
and the number of CVT entries. Please report if you encounter a
font where the selected values are not adequate.
So: Please test and report :-)
Werner
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