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Bug#717076: tech-ctte: Decide what jpeg library the Debian project will use

On Tue, Jul 23, 2013 at 02:52:43PM -0700, Don Armstrong wrote:
> 1) Does libjpeg-turbo (LJT) now completely support the libjpeg8 ABI?

I think it is more relevant to follow the ABI used by the rest of Linux
community. Pretty much everyone but Debian is moving to LJT, most users
still using the IJG libjpeg are using it for historic reasons.

libjpeg8 ABI is not really a well drafted ABI for long term use,
it is libjpeg62b + some new features. Using libjpeg8 ABI as a
yardstick of technical readiness feels misguided. Even the IJG 
itself moved to a new ABI (libjpeg9).

> 2) Do we have benchmark results which indicates that LJT is
> actually faster than IJG?

Some results from Linaro's testing on X86 and ARM:


I think relevant questions for Debian are what is better for Debian

 Fast JPEG encoding and decoding of baseline JPEG images (LJT), 
 or an slower library that is also a development platform for new
 JPEG image format and ABI features (IJG) ?

And how Debian works as part of the wider community:

 Are the features provided by IJG libjpeg so important, it is worth
 further fragmenting Linux binary compatibility (most distributions are
 going LJT) and breaking the universal JPEG image compatibility?


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