I believe on the good/best patch you are worried about the freeing of
the filter array. However in commit 756b54f6 you made pixman_set_filter
always copy the one provided by the caller. This means my code works
because the filter cannot be changed away from/to good/best without also
freeing the previous data.
The commit just says "Add boolean returns to various setters" so I am
wondering if this is a mistake. There is also a comparison of the
old/new pointers which won't work if the filter array is copied.
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