From: "Vladimir 'φ-coder/phcoder' Serbinenko" <phcoder@gmail.com>
To: The development of GNU GRUB <grub-devel@gnu.org>
Subject: Re: Adam7 and narrow PNG
Date: Wed, 02 Oct 2013 11:28:52 +0200 [thread overview]
Message-ID: <524BE754.9090807@gmail.com> (raw)
In-Reply-To: <BBCDB0B9B472124D9EED8CB900AA04CA1F92A3F1@corpappl747.corp.saab.se>
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On 02.10.2013 08:57, Melki Christian (consultant) wrote:
> Limited usefullness. I've used a lot of PNG's in GRUB lately and can't think of a reason why I would use either.
> Maybe paletted 8-bit (if-that’s what you meant?) to save space..
8-bit palette is an easy one. The tricky one is 4-/2-/1-bit palettes
(16-/4-/2-color) since then PNG packs several pixels in a single byte.
Usefulness of it to compress image is debatable since although it saves
space by itself, it messes with filter and huffman.
> but adam7? It's still going to be loaded as a bitmap.
> If I had some web png's and was to lazy to pass them through a converter...
The compatibility is the idea. Or if editor used by artist defaults to
adam7 and doesn't have an option (at least not easily accessible one) to
change this behaviour
> That beeing said, the work is done and unless it adds rediculous ammount of code size or execution time I'd be fine with the support.
>
>> -----Original Message-----
>> From: grub-devel-bounces+christian.melki=saabgroup.com@gnu.org
>> [mailto:grub-devel-bounces+christian.melki=saabgroup.com@gnu.org] On
>> Behalf Of Vladimir 'f-coder/phcoder' Serbinenko
>> Sent: den 2 oktober 2013 02:25
>> To: The development of GRUB 2
>> Subject: Adam7 and narrow PNG
>>
>> It was reported that GRUB doesn't support Adam7 and paletteed PNGs.
>> Attached patch would implement both of them but combining them results
>> in quite complex code since PNG works on bytes even if bpp <= 4 but
>> adam7 works on pixels. Does anyone have thoughts on adam7 and narrow
>> PNG usefulness?
> _______________________________________________
> Grub-devel mailing list
> Grub-devel@gnu.org
> https://lists.gnu.org/mailman/listinfo/grub-devel
>
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next prev parent reply other threads:[~2013-10-02 9:29 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-02 0:24 Adam7 and narrow PNG Vladimir 'φ-coder/phcoder' Serbinenko
2013-10-02 6:57 ` Melki Christian (consultant)
2013-10-02 9:28 ` Vladimir 'φ-coder/phcoder' Serbinenko [this message]
2013-10-02 12:05 ` Vladimir 'φ-coder/phcoder' Serbinenko
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