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Re: [Qemu-block] [Qemu-devel] [RFC v3 04/10] hw/m68k: add video card

From: Gerd Hoffmann
Subject: Re: [Qemu-block] [Qemu-devel] [RFC v3 04/10] hw/m68k: add video card
Date: Tue, 7 Aug 2018 10:44:51 +0200
User-agent: NeoMutt/20180622

> > +#define WRITE_BITS 8
> > +#include "macfb-template.h"
> > +
> > +#define WRITE_BITS 16
> > +#include "macfb-template.h"
> > +
> > +#define WRITE_BITS 24
> > +#include "macfb-template.h"
> > +
> > +#define WRITE_BITS 32
> > +#include "macfb-template.h"
> Not sure, but do we still need all these "destination" bit depth
> nowadays? I thought QEMU only supports 32 bit depths these days?

Well, qemu UI code can handle non-32 bit depths too (pretty much
anything pixman supports to be exact).

But, yes, qemu hands out 32bit DisplaySurfaces by default, i.e. when
using qemu_console_resize() or qemu_create_displaysurface() in display
device emulation.

You can ask for something else, using qemu_create_displaysurface_from(),
which is typically used in case the backing storage for the
DisplaySurface is guest memory, to avoid copying/converting display
data.  The code above probably doesn't look like it is doing that though.


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