The CPU and GPU implementations of the compositor Texture node sample
the texture at different locations, producing differences. This is
primarly an issue with half pixel offsets to evaluate the texture at the
center of the pixels.
The CPU compositor only adds the offsets if interpolation is disabled,
regardless if the texture is of type image or not. Further the offset
was wrong, since it was not a half pixel offset, but a full pixel one.
The offsets should always be added, since it won't make a difference in
the non interpolated case, and it should always be added especially if
interpolation is enabled. A comment in the old code mentions something
about artifacts, but it is possible that this is a consequence of the
wrong offset that was used.
This patch always adds a half pixel offset, following the GPU code.
Pull Request: https://projects.blender.org/blender/blender/pulls/118377
9ab72eae38