* [Qemu-devel] VGA 2bit mode
@ 2008-04-25 18:04 Samuel Thibault
2008-04-28 10:30 ` [Qemu-devel] " Samuel Thibault
0 siblings, 1 reply; 3+ messages in thread
From: Samuel Thibault @ 2008-04-25 18:04 UTC (permalink / raw)
To: qemu-devel
Hello,
I don't have a VGA book right here to check, but I don't understand
vga_draw_line2_:
d += BPP * 8;
s += 4;
i.e. 4 bytes for 8 pixels and vga_draw_line4_:
d += BPP * 8;
s += 4;
i.e. 4 bytes for 8 pixels too. Does VGA 2bit mode voluntarily waste
memory?
Samuel
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Qemu-devel] Re: VGA 2bit mode
2008-04-25 18:04 [Qemu-devel] VGA 2bit mode Samuel Thibault
@ 2008-04-28 10:30 ` Samuel Thibault
2008-04-28 14:03 ` Stuart Brady
0 siblings, 1 reply; 3+ messages in thread
From: Samuel Thibault @ 2008-04-28 10:30 UTC (permalink / raw)
To: qemu-devel
Answering to myself:
Samuel Thibault, le Fri 25 Apr 2008 19:04:06 +0100, a écrit :
> I don't have a VGA book right here to check, but I don't understand
> vga_draw_line2_:
>
> d += BPP * 8;
> s += 4;
>
> i.e. 4 bytes for 8 pixels and vga_draw_line4_:
>
> d += BPP * 8;
> s += 4;
>
> i.e. 4 bytes for 8 pixels too. Does VGA 2bit mode voluntarily waste
> memory?
Looks like it does, yes.
Samuel
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Qemu-devel] Re: VGA 2bit mode
2008-04-28 10:30 ` [Qemu-devel] " Samuel Thibault
@ 2008-04-28 14:03 ` Stuart Brady
0 siblings, 0 replies; 3+ messages in thread
From: Stuart Brady @ 2008-04-28 14:03 UTC (permalink / raw)
To: qemu-devel
On Mon, Apr 28, 2008 at 11:30:06AM +0100, Samuel Thibault wrote:
> Answering to myself:
>
> > Does VGA 2bit mode voluntarily waste memory?
>
> Looks like it does, yes.
Of course, if the comment explaining this were not missing, you would
not need to ask the question. :-)
--
Stuart Brady
^ permalink raw reply [flat|nested] 3+ messages in thread
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2008-04-25 18:04 [Qemu-devel] VGA 2bit mode Samuel Thibault
2008-04-28 10:30 ` [Qemu-devel] " Samuel Thibault
2008-04-28 14:03 ` Stuart Brady
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