[Lazarus] Help with algorithm

[Hans-Peter Diettrich]

Leonardo M. Ramé schrieb:

> I'm thinking of copying the buffer into an two dimensional matrix, apply
> transformations, then extract the overlapping part and lastly paint.

Overlapping is typically handled in the graphics library (or card).

> Before doing so, I'm asking here, because I'm afraid it could take too
> long to apply "n" transformations before displaying the final result.

That's my suspicion as well :-(

I'd suggest that you use some existing library for image processing, 
because these make use of hardware features built into graphics cards. 
That's how 3D animations work, which require more transformations than 
you intend to use. Details depend on your audience, i.e. a solution for 
your personal machine only, or for use on any machine.

Otherwise I'd implement specialized functions as you mentioned (VFlip, 
HFlip...), possibly with an wrapper that calls the appropriate 
functions. Then you also can exchange the implementation of the wrapper, 
with no impact on the rest of your program.

DoDi