Rockbox mail archiveSubject: Re: Another list optimization
Re: Another list optimization
From: Dave Hooper <dave_at_beermex.com>
Date: Sun, 25 Jun 2006 14:26:50 +0100
I'm secretly sorta surprised that using two framebuffers (one for the background and one for the foreground/text) would make a significant difference to just blitting the background and rewriting the text (as we currently do). If it does make a significant difference doesn't it just mean our text blit code is in need of optimising?
----- Original Message -----
From: Paul Louden
To: Rockbox development
Sent: Sunday, June 25, 2006 12:45 PM
Subject: Re: Another list optimization
Isn't the text and the mask the same thing? You just have two framebuffers. The "foreground" which is only drawn in the foreground color and is primarily text. And the actual framebuffer. The backdrop is stored wherever it is currently (which I suppose you could call a framebuffer but it never changes really.) Since the foreground image is always 1-bit, 1 is drawn in the foreground color, 0 uses the pixel at that location from the backdrop buffer instead, right?
I'll admit that I don't know the code at all, but it seems kinda simple since text is always drawn 1-bit. I'm probably missing something.
On 6/25/06, postmaster_at_diffenbach.org <postmaster_at_diffenbach.org> wrote:
> I've now implemented another optimization, used when items "move off"
> the top or bottom of the list. The implementation just copies the
> framebuffer over itself, to move the unchanged items up or down in the
If you have a 60 GB ipod only, you can try it here:
Received on 2006-06-25