[Bug 13096] Enhancement: Set single component for pixel

https://www.w3.org/Bugs/Public/show_bug.cgi?id=13096

Ian 'Hixie' Hickson <ian@hixie.ch> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|                            |NEEDSINFO

--- Comment #4 from Ian 'Hixie' Hickson <ian@hixie.ch> 2011-12-02 17:10:35 UTC ---
EDITOR'S RESPONSE: This is an Editor's Response to your comment. If you are
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Status: Did Not Understand Request
Change Description: no spec change
Rationale: Do you have data showing that setting all four bytes of a pixel at a
time is actually a performance problem? It seems highly unlikely to me that
with modern architectures there would be any practical difference. If anything,
setting one byte out of a 32bit word would seem to likely be more expensive
that setting all 4 bytes. Certainly if you're manipulating more than one pixel
at a time (which I assume in reality you would almost always be, since changing
just one pixel every 20ms would be an imperceptibly slow change to an image)
then it's quicker to just blit the entire image as one solid memory block than
it is to try to just push over the channels that have changed.

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Received on Friday, 2 December 2011 17:10:38 UTC