Re: Scan Size Clarification and JPEG/whatever format data

David Mosberger-Tang (David.Mosberger@acm.org)
Fri, 23 Oct 1998 09:47:57 -0700

>>>>> On Fri, 23 Oct 1998 03:52:30 -0600, Sean Reifschneider <jafo@tummy.com> said:

Sean> It's not entirely clear to me from the draft document how soon
Sean> after doing a "start scan" that it's expected the X and Y
Sean> image size will be known. The back-end I'm working on right
Sean> now doesn't actually have the exact size (only an estimate
Sean> because of auto-page-size detection) until after the first
Sean> data read has completed.

Actually, I think the draft is pretty clear:

"The returned parameters are guaranteed to be accurate between
the time a scan has been started (sane_start() has
been called) and the completion of that request."

Sean> I suspect that some front-ends will expect it to be accurate
Sean> before reading the first data-block (for writing a header or
Sean> allocating the image buffer).

Yup, this is correct. Maybe you can buffer the first line?

--david

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