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[0.17 backport] Fix source crop + performance improvement for pixman renderer

Consolatis requested to merge Consolatis/wlroots:backport_017/pixman_render_perf_and_fixup into 0.17

This MR backports the pixman renderer performance improvement (!4659 (merged), also fixes source crop for pixman) and its fixup (!4690 (merged)). I left out the half pixel shift commit (77006e55) and the corresponding revert (d7f63ab7).

Fixing only the source crop issue in the 0.17 branch without also backporting the performance improvement was deemed too complicated for little gain and also creates a 0.17 specific code path that has to be maintained.

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