Use BWIPP postscript templates

[adamchainz]

Following #496 (comment)

This isn't quite functinoal, the images are weirdly cropped

[adamchainz]

I fixed the cropping by dividing the translate x/y values by 2.

@terryburton perhaps that needs updating in https://github.com/bwipp/postscriptbarcode/wiki/Developing-a-Frontend-to-BWIPP#generating-cropped-images-via-eps ? This change makes treepoem follow that process pretty closely, apart from this divide-by-2, and using %%HiResBoundingBox.

[terryburton]

I fixed the cropping by dividing the translate x/y values by 2.

I assume this is a result of scaling by 2 in your processing? So that's fine.

If at any point you export the EPS then you'll need to include the BoundingBox for DSC conformance purposes. It can just be floor/ceiling of the HiResBoundingBox values (maximising the enclosure).

[adamchainz]

I assume this is a result of scaling by 2 in your processing? So that's fine.

Ah, yes. Had a little bug there with different scale values, fixed by moving the scale out of postscript.

If at any point you export the EPS then you'll need to include the BoundingBox for DSC conformance purposes. It can just be floor/ceiling of the HiResBoundingBox values (maximising the enclosure).

Thanks, although we don't export the EPS, I'll add that now just in case.