[Vm-dev] pb with primitive #primitiveScreenDepth on Linux ?
bert at freudenbergs.de
Tue Jan 31 17:18:40 UTC 2017
On Tue, Jan 31, 2017 at 10:44 AM, Christophe Demarey <
christophe.demarey at inria.fr> wrote:
> With Pavel, we discovered a strange behavior of the primitive
> #primitiveScreenDepth on Linux. It returns a value of 24 bits per pixel
> (True colors) that looks valid but not supported (at least by Pharo).
> DisplayScreen actualScreenDepth "(calling the primitive screenDepth)"
> => 32 on OS X [OK]
> => 24 on Linux [KO]
> Also, it is not consistent with the primitive 91
> DisplayScreen new supportsDisplayDepth: DisplayScreen actualScreenDepth
> => true on OS X
> => false on Linux
> There are some safeguard image-side but it would be great if someone could
> check that vm side.
That seems wrong indeed, since BitBlt can only handle power-of-two depths
currently. It should answer 32 or -32 in this case.
Actually ... is there a difference in pixel layout for 32 bit MSB vs LSB
forms? A quick test in SqueakJS suggests there isn't.
- Bert -
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Vm-dev