Re: [Lcms-user] Improvement for TYPE_BGRA_8.

[Marti M. <mar...@li...>]

Hi Sebastien ,

Nice. After reviewing this change I think is perfectly valid and I have 
committed it to
the GIT main sources. Thanks! Now you are in the contributors list.

Regarding the copyright, this is a good point. I put copyright Marti 
blah blah
to have some proof of prior art in the case of anybody trying to patent 
any lcms
algorithm. But many people has contributed to the code, so I can't 
pretend to
be the author of contributed code.

if you  (or any other contributor) wants a specific notice of copyright 
on his part,
please  let me know. Actually I keep a contributors list in the authors 
file, but I'm not
a lawyer  and probably this is not enough.

Merci bien.

Best regards
Marti Maria
The LittleCMS project
http://www.littlecms.com



El 18/12/2012 14:48, Sebastien Leon escribió:
> Hi,
>
> I use Qt framework (Qt3/4/5) and default true colors images are
> TYPE_BGRA_8 on Mac/Linux/Windows.
> This WE, I traced step by step LittleCMS to understand its logic and to
> extend it to manage alpha linked images.
> At this occasion, I realized that TYPE_BGRA_8 has not been optimized in
> the decompressor list.
> It was a trivial code to implement but once I get it, I get an
> interesting boot on performance :
>
> Bench results :
>   * 39 ms with LittleCMS 2.4
>   * 22 ms with LittleCMS 2.4 including an optimized decompressor for
> TYPE_BGRA_8.
>
> As Qt and Win32 DIBs (also TYPE_BGRA_8) are widely used, I think that my
> modifications could be of any use...
> Here is a link to the modified cmspack.c file :
>
> http://sebastienleon.com/info/littleCMS/cmspack.withBGRA_8.c
> (obviously, I give all copyrights to Marti)
>
> I'll shot another email regarding the support of Premultiplied Alpha
> images (linked alpha).
>
> Best regards
>
> Sébastien Léon
>
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