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Re: Pixel-based display functions

From: Eli Zaretskii
Subject: Re: Pixel-based display functions
Date: Sat, 07 Feb 2015 16:03:54 +0200

> Date: Sat, 07 Feb 2015 14:51:10 +0100
> From: martin rudalics <address@hidden>
> CC: address@hidden, address@hidden
>  >> The latter calls `vertical-motion' so this should work indeed.  But does
>  >> `vertical-motion' have to go back to the beginning of a logical line
>  >> when it's broken into several visual lines?
>  >
>  > Yes, it does.  There's no other place where the display engine can
>  > _know_ that the X coordinate is zero.
>  >
>  >> This would mean that we'd always have to rescan from the beginning
>  >> of the logical line for each visual line break
>  >
>  > Yes.
> This would get us quadratic time.  We should stay linear.

The only way to stay linear is to display the entire physical line in
one go.

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