[Spice-devel] A question about QXL

[Van Yu]

Got it.  So DrvXXX is still the final leaves. Thank you very much ：）


> On Oct 31, 2016, at 5:57 PM, Frediano Ziglio <fziglio at redhat.com> wrote:
> 
>> 
>> Hi experts,
>> 
>>  Recently I’m studying QXL XDDM driver to see how the display are
>>  accelerated.
>> 
>>  One thing I do not understand is that I thought some updates should be
>>  missing on clients.
>>  Say in the implementation of DrvBitBlt function, if it is not supported.
>>  the implemention will punt to EngBitBlt.
>> 
>>  However, in such case, no QXL command is pushed to cmd ring. So how does
>>  spice client notice the frame buffer change
>> made by EngBitBlt?
>> 
>>  Can anyone help provide guidance on this?
>> 
>>  Thanks.
> 
> Hi,
>  basically when EngBitBlt is called Windows implements the command
> using different calls so basically EngBitBlt will call others Drv* functions
> to implement DrvBitBlt for QXL driver. That Drv* functions will push commands
> to the ring.
> 
> Frediano