Tom 95434d70ed LibGfx: Allow specifying a separate source bitmap for Filter::apply ...

By allowing to specify a separate source bitmap when calling Filter::apply
the same filter can be applied to multiple areas, and also doesn't need
to use a temporary bitmap. This also enables us to apply the filter to
multiple regions properly, even if they are (almost) adjacent.

If no separate source bitmap is supplied then a temporary bitmap is still
necessary.

2020-10-12 20:04:48 +02:00

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