what's the diff between the accumulated bounding rectangle & the update region ?

[Rainstorm]

what's the difference between the accumulated bounding rectangle & the update region ?
..other than the accumulated bounding rectangle can be stopped & started


thanks!

[Tedd]

At a guess..

Update Region = the region of pixels that needs to be redrawn - may be any combination of multiple shapes (not just rectangles.)

Bounding Rectangle = the smallest rectangle that encloses the update region.

[Rainstorm]

tedd,  thanks :wink

it seems, maybe to offer some control too.. in that it can be switched on & off, so you'd get only a specific portion of the update region(assuming more stuff got added to the update region after that) if that was done i think. . without immediately updating the window.