[fpc-devel] TFPCustomCanvas Expanded Clipping

Hans-Peter Diettrich DrDiettrich1 at aol.com
Wed Dec 7 14:43:54 CET 2011

Felipe Monteiro de Carvalho schrieb:
> On Wed, Dec 7, 2011 at 11:27 AM, Hans-Peter Diettrich
> <DrDiettrich1 at aol.com> wrote:
>> IMO the fastest implementation paints everything to a bitmap, then masks the
>> painting with the region. This should be faster than clipping every single
>> drawing primitve.
> Please prove with test cases which take into account both speed and
> memory usage and are executed against my implementation and also
> against whatever else proposed =)
> Things in practice are much more complex then one might initially
> imagine. My regions implementation is reused for several things:
> 1> Drawing clipping
> 2> Drawing complex objects like poligons, polybeziers, arbitrary regions
> 3> To clip mouse/touch events

Thanks, this finally answers my old question, what's the purpose of 
regions in your model. My suggestion was about clipping regions only, 
not about regions as paint objects.


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