[haiku-appserver] Re: clipping
- From: Adi Oanca <adioanca@xxxxxxxxxxxxx>
- To: haiku-appserver@xxxxxxxxxxxxx
- Date: Fri, 25 Mar 2005 20:36:28 +0200
Hi,
DarkWyrm wrote:
>>Hi,
>>
>>while I'm still cleaning up and shuffling arround code, could someone
>>explain to me how clipping is supposed to work in app_server? The
>>clipping region is passed in the DrawData object, but what coordinate
>>space is this supposed to be in, screen space? Why is there a
>
> Everything which takes place in the DisplayDriver is in screen
> coordinates. I _think_ that the region objects kept in Layer are
> relative to the layer itself, if not, then they are relative to the
> parent. Adi?
All regions are in screen space. At least that the intention. :-)
>>DrawBitmap call, that takes an additional clipping region? It seems
>>to
>>be the only DrawBitmap call in actual use (by ServerWindow), while
>>the
>>other one has neither a DisplayDriver nor ViewDriver implementation
>>(but DirectDriver and BitmapDriver implement it, but those are not in
>>regular use, are they?). PicturePlayer uses the second form of
>
> The unused one is probably cruft. PicturePlayer is so old and crusty
> that it actually has mold growing on it. :P
=))
>>DrawBitmap(), the one which isn't actually implemented. In which
>>coordinate space is the clipreg member of PicturePlayer?
>>Do all drawing commands allways get the screen coordinate system?
Yes. If it's not like that, it should be.
>>What
>>about scaled and scrolled BViews, is that taken into account already?
Taken into account, yes. Implemented no.
>>If so, where is the origin of the scale supposed to be then?
LayerData::coordOrigin
bye,
Adi
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