[boot scriptor] Re: BMP images Size

I do not know whether this is possible or not: keep using the 320 x 240 BMP,
but change your code to display it in 640 x 480 resolution instead of
filling it into full screen which may mean 800 x 600 or larger.

Best regards

----- Original Message -----
From: "Michael K Ter Louw" <mterlouw@xxxxxxx>
To: <bscript@xxxxxxxxxxxxx>
Sent: Monday, November 18, 2002 11:33 PM
Subject: [boot scriptor] Re: BMP images Size


>
> Hi Michael,
>
> > The new feature of displaying BMP images in Version 1.2.14b
> > is a very good value-added feature.  However, when a 320 x
> > 240 BMP is amplified into a 800 x 600 screen or even larger,
> > the displaying quality is  not admirable.  It will be nice if
> > we can restrict the displaying size of the BMP images to 640
> > x 480.
>
> Yes, I know the image is extremely low resolution, and I'd really like
> to have 640x480 true-color images.  There are a couple reasons why the
> current limitation is set:
>
> 1. I've never programmed Vesa BIOS Extensions (VBE) before.
> 2. High-res, high-color images would take a lot of memory to store
> (about 900kb), which isn't really doable in Boot Scriptor's current
> state.  So I guess that leaves streaming the image directly off the
> CD/DVD into VRAM as the only option.  This may in fact work, now that I
> think about it, since true-color BMP's don't need the intermediate
> decoding stage.
>
> But it may be slow.  I think if I was to do this, I'd require at least 2
> pages of VRAM which would allow me to show a blank screen while loading
> the image.  That would require a minimum of about 2Mb on the adapter.
> This shouldn't rule out too many VBE compliant systems I don't think, so
> unless there are any objections this will probably be acceptable.
>
> Maybe there should also be the capability for Boot Scriptor to do a
> (crude) down-sample of the image and use it as 320x240x8 if either VBE
> or 2Mb VRAM isn't available, but that's a lot more work.
>
> Now all I need is the time and the inclination.  My #1 priority still is
> to get Boot Scriptor 1.2 stable on as many systems as possible.
>
> Mike
>
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