Previously, a picture with a half-translucent mask would not function correctly.
This fix addresses the bug by applying the expected composition step.
Note: Even after applying this patch, a half-translucent mask with shape fill alpha will still not work properly.
We should consider removing the fill alpha property, as it duplicates the Paint opacity.
@Issue: https://github.com/thorvg/thorvg/issues/1423
../src/examples/Performance.cpp:32:8: error: 'uint' does not name a type; did you mean 'u_int'?
32 | static uint cnt = 0;
| ^~~~
| u_int
@Issues: https://github.com/Samsung/thorvg/issues/1247