[Spice-devel] Client Graphics Filtering

[Noel Van Hook]

If I recall my windows drivers correctly, I don't think the driver
even knows what application owns the buffer it is drawing into.

Noel

On Tue, Apr 24, 2012 at 11:43 AM, Yonit Halperin <yhalperi at redhat.com> wrote:
> Hi,
>
> On 04/24/2012 09:12 AM, Alon Levy wrote:
>>
>> On Tue, Apr 24, 2012 at 09:47:47AM +0800, 蒋媛园 wrote:
>>>
>>>  Hi
>>>    I want to filter the graphics to the client. For example, only the
>>> graphics of a calculator(in guest OS Win7) are send to the client.
>>>    I know that there is always the possibility of falling all the way
>>> back to CPU drawing to a memory bitmap which is then copied to the client.
>>>    Now, I have filtered the drawing commands on device-managed surfaces
>>> which belong to some app.exe. However I don't know how to control the
>>> engine-managed surfaces, namely those pre-rendered bitmaps. I didn't find
>>> related code in QXL driver.
>>>    Could you please give me some advice? I really need some help.
>>>
> I'm not sure I understand exactly what you mean. I guess that by
> engine-managed, you mean gdi bitmaps? When the destination of a drawing
> operation is a gdi bitmap, the client doesn't know about this operation. The
> driver renders the src* of the operation if needed (if it is a device
> managed bitmap), copies the relevant src area to a new gdi bitmap, and
> fallback to a Gdi call, with the "copied src" and original dest.
> If the destination is a device managed bitmap, and the src* is a gdi managed
> bitmap, the gdi bitmap is copied to the device memory, and the corresponding
> qxl drawing command is sent to the server together with the reference to the
> copied bitmap.
>
> * There can be multiple references to bitmaps in one qxl command
> (src/mask/brush), and each one can be a bitmap (gdi/device)
>
> Regards,
> Yonit.
>>
>>
>> Great to hear someone is working on this, I don't have an answer though,
>> Yonit, any idea maybe?
>>
>>>
>>> Thanks in advance
>>>  Best Regards!
>>>
>>>
>>>
>>>
>>>
>>> 网易Lofter，专注兴趣，分享创作！
>>
>>
>
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Noel Van Hook - Intelligraphics, Inc
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