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    SubjectRe: [Linux-fbdev-devel] Re: FBdev updates.
    On Thu, 2003-03-06 at 04:23, James Simmons wrote:
    > > > And one (or two...) generic questions: why is not pseudo_palette
    > > > u32* pseudo_palette, or even directly u32 pseudo_palette[17] ?
    > >
    > > Yes, all drivers should treat the pseudo_palette as u32* anyway, so why
    > > not change pseudo-palette from void* to u32*?
    > See other email.
    > > > And why we do not fill this pseudo_palette with
    > > > i * 0x01010101U for 8bpp pseudocolor and i * 0x11111111U for 4bpp
    > > > pseudocolor? This allowed me to remove couple of switches and tests
    > > > from acceleration fastpaths (and from cfb_imageblit and cfb_fillrect,
    > > > but I did not changed these two in my benchmarks below).
    > >
    > > I also agree for a different reason. Cards with unconventional formats
    > > (such as monochrome at 8 bpp - 0 for black , 0xff for white) will not
    > > work with the current code.
    > Isn't that the job of setcolreg?
    setcolreg does that for directcolor and truecolor modes, because they're
    the only ones that uses the pseudo_palette. See all driver codes, the
    pseudo_palette is never initialized if in pseudo_color.

    The purpose of the pseudo_palette is to enable to write pixels to the
    framebuffer without knowing the color format at all. So, if you have
    monochrome, then black is 0 and white is 1. But for monochrome 8bpp,
    black is 0 and white is 0xff.

    fbcon will send 0's and 1's, thus 0 and 1 will be written to the
    framebuffer. If the drawing functions referred to the pseudo_palette,
    whatever the visual format, then 0 and 0xff will be written, as it
    should be.

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