--- Michael Glickman <michaelg@linx.com.au> wrote:
> # To subscribers of the xforms list from Michael Glickman
> <michaelg@linx.com.au> :
>
> Sorry, but 32 bits per pixel does make sense.
> One thing is the number of bits per pixel (i.e.
> screen depth), another thing is how many bits
> are actually used to represent the colour.
>
> In this case we have 32 bits per pixel, but only
> 24 bits are actually used for the colour.
depth is NOT bpp.
You may
> argue that 8 extra bits for each pixel is just a
> waste of video memory. However, the fact that
> each pixel requires exactly one 32bit word,
> makes it easier and more efficient for programming
> the video frame buffer.
>
> Some cards and XServers (including XFree86)
> support both 24bit and 32bit modes, that effectively
> is the same, but 24bit should be all right (at least
> I don't have troubles with it).
>
> I wonder, where xdpyinfo get significant bits in color
> specification. It could be a part of Visual structure.
> This could give a clue to the actual number of bits
> used for colours. Anyway it is better than hardcoding:
> "32bits is equivalent to 24bits"
>
> Regards, Michael
>
>
> > -----Original Message-----
> > From: T.C. Zhao [SMTP:tc_zhao@yahoo.com]
> > Sent: Wednesday, 22 September 1999 14:54 EST
> > To: xforms@bob.usuhs.mil
> > Subject: Re: XForms: XForms crashes with LinuxPPC + 32 bpp
> >
> >
> > depth==32 ? This is really interesting. Frankly I think this is
> > just plainly wrong. See below.
> > so it looks like we have 8bits of red, 8bits of green and
> > 8bits of blue, packed GBR. Looks like a depth==24 to me
> > (bits per pixel can be whatever the server likes, but depth
> > has meaning, i.e.,if depth is k, I would expect I can get 2^k-1
> > colors).
> >
> > In any case, xforms tried 1<<depth-1, and got a minus 1, which
> > was subsequently used to communicate with the server and really
> > upsets it. I'll try add some workaround.
> >
> >
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