| Re: [AD] update bitmap drawing after addition of transformations |
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- To: Coordination of admins/developers of the game programming library Allegro <alleg-developers@xxxxxxxxxx>
- Subject: Re: [AD] update bitmap drawing after addition of transformations
- From: Elias Pschernig <elias.pschernig@xxxxxxxxxx>
- Date: Fri, 13 Aug 2010 13:01:28 +0200
On Fri, 2010-08-13 at 10:57 +1000, Peter Wang wrote:
>
> I have not benchmarked it yet, but I imagine the performance loss will be
> significant. If it is, can we not make the memory draw_bitmap_region
> implementation infer the rotate/scale special cases from the transformation
> matrix and call the specialised functions?
>
We can check for identity transform and for only scaled transform quite
easily I think.
Not sure about rotation. Would there be a big difference for it? What
the rasterizer has to do in both cases is draw a textured quad... so I
hope it doesn't really matter.
(My long-term plan actually was to get rid of this archaic
parallelogram_map function completely - a software polygon rasterizer
doesn't fit into the core lib in my picture of how things should be
organized :P)
--
Elias Pschernig <elias.pschernig@xxxxxxxxxx>