On Tue, 4 Sep 2001, Michel Lespinasse wrote:
> Hi,
>
> I'm asking about a clarification to the DGA2 API.
>
> The function XDGASetMode returns a pointer to an XDGADevice, where the
> "data" field should be set to either NULL or a pointer to the DGA
> framebuffer.
>
> Am I correct to assume that if xdgadev->data is not NULL, it will
> point to the first pixel of the screen ? i.e. there will be no offset
> between the start of the framebuffer memory and the first pixel ?
In theory. Doesn't mean there aren't bugs though. And
actually, looking at the code, it's probably broken if the
offset doesn't lie on a page boundary. The library appears
to map (base+offset) rather than mapping base and returning
(virtual(base) + offset) like it should.
Mark.
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