Add PS-specific reference images for 4 tests

The following 4 tests recently started drawing with native operations
in the place of image fallbacks, so we need ps-specific reference images
to account for minor rasterization differences: over-above-source,
over-around-source, over-below-source, and trap-clip.

1 files changed, 0 insertions, 0 deletions

diff --git a/test/over-below-source-ps-argb32-ref.png b/test/over-below-source-ps-argb32-ref.png
new file mode 100644
index 00000000..980ad5f9
--- /dev/null
+++ b/test/over-below-source-ps-argb32-ref.png