[HarfBuzz] How harfbuzz handles memory alignment?
behdad at behdad.org
Fri Dec 2 00:36:33 UTC 2016
Right. Note that on Arm, gcc aligns even byte-structs to 4 bytes. That's
why we have -mstructure-size-boundary=8 in configure.ac on arm.
On Sun, Nov 27, 2016 at 1:22 PM, Ebrahim Byagowi <ebraminio at gmail.com>
> didn't know about byte array alignment trick, thanks :)
> On Sun, Nov 27, 2016 at 6:16 PM, Richard Wordingham <
> richard.wordingham at ntlworld.com> wrote:
>> On Sat, 26 Nov 2016 23:52:40 +0330
>> Ebrahim Byagowi <ebraminio at gmail.com> wrote:
>> > Hey guys, just like to know how harfbuzz handles memory alignment
>> > without having even one #pragma pack around? Does `IntType`
>> > <https://github.com/behdad/harfbuzz/blob/02bfd965af588640250
>> > handles padding somehow or harfbuzz copies its own structs? Thanks.
>> If you look at the specialisations of struct BEInt immediately above
>> in the same file, you'll see that the values are handled as arrays of
>> unsigned bytes (type uint8_t). Endianity and misalignment are handled
>> One OpenType table that may contain misaligned data is the name table
>> - nothing forces UTF-16 characters to be aligned on 2-byte boundaries,
>> and I've seen fonts where it isn't so aligned.
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