Re: [PATCH] [2.5.21] CyberPro 32bit support and other fixes

Russell King (rmk@arm.linux.org.uk)
Sat, 15 Jun 2002 13:30:50 +0100

On Sat, Jun 15, 2002 at 12:55:47PM +0200, Denis Oliver Kropp wrote:
> > > There's no speed benefit and
> > > applications running in true/direct color would look wrong.
> >
> > For userland no but for the kernel we do have a benifiet.
>
> There's no speed benefit if you write "index|index|index" into the
> framebuffer instead of "red|green|blue".

You're actually asking the wrong question. "Why is there such a thing as
directcolor" would be a better question. After all, if there's no "speed
benefit" when why do manufacturers bother implementing it?

Could it be because it allows colours to be dynamically allocated? Given
a "good enough" allocator which looks over your complete colour usage, you
could probably make better use of the available colours than truecolor
allows.

-- 
Russell King (rmk@arm.linux.org.uk)                The developer of ARM Linux
             http://www.arm.linux.org.uk/personal/aboutme.html


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