RectangleBorder optimisations

donotturnoff / display

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RectangleBorder optimisations #20

Open donotturnoff opened 3 months ago

donotturnoff commented 3 months ago

We can optimise in these cases and possibly more:

A neighbouring side has the same colour
A neighbouring side has the same thickness
A neighbouring side has 0 thickness
The side is entirely in the clipping bounds

donotturnoff commented 3 months ago

A big optimisation would be to render the top and bottom overhangs of the left and right along with the top and bottom borders. This would probably improve cache efficiency, would allow the break position calculations to be done once rather than twice, would make the code simpler, and would make the other optimisations simpler