BalloonCanvas question
Hilaire Fernandes
hilaire2006 at laposte.net
Mon Nov 20 19:45:32 UTC 2006
Bert Freudenberg a écrit :
>
> On Nov 20, 2006, at 17:04 , Hilaire Fernandes wrote:
>
>> Karl a écrit :
>>> Bert Freudenberg wrote:
>>>>
>>>> On Nov 19, 2006, at 12:41 , Hilaire Fernandes wrote:
>>>>
>>>>> Bert Freudenberg a écrit :
>>>>>> On Nov 19, 2006, at 10:22 , Hilaire Fernandes wrote:
>>>>>>> What is the use of the ifNoTransformWithIn: method?
>>>>>>> When I use the BalloonCanvas within a morph drawOn: method, the
>>>>>>> ifNoTransformWithIn: is forcing the use of the super graphic
>>>>>>> method, so no anti-aliasing take place.
>>>>>>> I am sure there are pretty good reason, but I don't get it.
>>>>>> An axis-aligned rectangle can be drawn much faster using BitBlt
>>>>>> than using Balloon. That case is detected by the method.
>>>>>
>>>>> Ok, so it is a feature. However in that case the AA is off and
>>>>> there are no way to get it back, right?
>>>>
>>>> BitBlt does no AA, right.
>>> I did some hacking a few years ago and did some overriding of the
>>> super calls and did get anti alias with a speed penalty.
>>> karl
>>
>> Thanks for your info.
>>
>> I guess that all of my consideration will become more or less obsolete
>> with the coming CAIRO support. I have not yet checked Rome, but I
>> guess in that situation the cairo graphic functions could be used in
>> the drawOn: morphic methods. Is it that?
>
> If you speak of Rome, it defines a new Canvas protocol, which is
> similar, but not exactly as the old Canvas. It currently renders into an
> offscreen bitmap (registered in SurfacePlugin), which can be copied to
> the screeb using BitBlt. Rome specifically is *not* a Cairo binding, but
> happens to use the Cairo library as one of its backends.
Thanks for the clarification.
Rome being more than a Cairo binding looks exiting!
Is the Rome canvas upward compatible with the old canvas?
Could we use Rome to render custom Morph?
Hilaire
More information about the Squeak-dev
mailing list
|