op/paint: add opacity operation

The new paint.PushOpacity allows for adjusting the opacity of a group
of drawing operations.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2023-09-07 14:44:56 -05:00
parent ae43d18ced
commit ae3bd2a1e1
8 changed files with 270 additions and 53 deletions
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