Latest revision as of 11:47, 2 July 2010

[edit] Replace libjpeg by libjpeg-turbo

[edit] Summary

libjpeg-turbo is fork of the original libjpeg project. It contains numerous performance related enhancements and is at least twice faster in JPEG compression/decompression than original libjpeg on platforms with MMX/SSE instruction set. It has same API/ABI like original libjpeg and also runs on non-SSE platforms where is around 25% faster.

[edit] Owner

• Name: Adam Tkac

[edit] Current status

• Targeted release: Fedora 14
• Last updated: 2010-07-02
• Percentage of completion: 100%

[edit] Detailed Description

Everything is written in summary.

[edit] Benefit to Fedora

Much faster JPEG compression/decompression library. JPEG codec is widely used and it is good to speed up core library which implements it. Additionally, libjpeg-turbo is developed in more open-source manner than original libjpeg.

[edit] Scope

libjpeg-turbo has same API/ABI as libjpeg so no package needs to be rebuilt

[edit] How To Test

You can use any program which uses libjpeg-turbo code. You should try to perform JPEG compression/decompression to and check if you don't see artefacts. You can also compare speed of the libjpeg-turbo against libjpeg, you should be able to visually check that libjpeg-turbo is really faster.

[edit] User Experience

A lot faster JPEG compression/decompression

[edit] Dependencies

462 packages (repoquery --alldeps --whatrequires libjpeg |wc -l) but no rebuild is needed due API/ABI compatibility

[edit] Contingency Plan

Revert to libjpeg when libjpeg-turbo hits some serious problems.

[edit] Documentation

• http://sourceforge.net/projects/libjpeg-turbo

[edit] Release Notes

libjpeg library has been replaced by libjpeg-turbo library which has same API/ABI but is at least twice faster on all primary architectures and about 25% faster on secondary architectures

[edit] Comments and Discussion

• See Talk:Features/libjpeg-turbo