Jonathan G Rennison 8f442500ea Change how dirty screen, window and viewport areas are tracked for later redrawing ...

Track dirty viewport areas seperately form general screen redraws.
Maintain a dirty block grid per viewport, with a smaller block size.
Use even smaller block size in viewport map mode.

Use a rectangle array for general screen redraws instead of a block grid.

Add a dirty bit to windows and widgets, to simplify the common case
of repainting a whole window or widget, without catching
neighbouring windows or viewports.

2020-03-05 00:27:17 +00:00

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