Clip path ignored except by pdfwrite

[Paul Wessel]

Hi gs maintainers-

The Generic Mapping Tools (GMT; gmt.soest.hawaii.edu) uses PostScript for 
plotting.  For some contour labels and texts we set up clip paths based on 
bounding boxes around each text item to ensure that later plot items do not 
overwrite the labels.  We then turn clipping off.  However, we believe we have 
found a bug in gs affecting this situation.

The attached file both2.ps illustrates the problem. The top panel places two 
rectangular text boxes as clip paths and the bottom places two rounded 
rectangles as clip paths [we are not showing the texts in either case].  Both 
panels are then overwritten by a rectangular hachure image, and due to clipping 
the boxes should be visible in page white.  Converting the PS file to PDF 
works: gs, Preview, Distiller, and PS printers all render the correct result.  
However, when we use gs to produce a raster file (JPG, TIFF, PNG, etc) or use 
gv (which presumably needs to produce a raster as well) the clipping is absent 
and no errors are reported.  We thus suspect there is a bug in the function 
that rasterizes the PS.

My particular gs version is 9.10 installed from macports under OS X 10.9.2, but 
reports from Linux and Windows are similar.  I have reduced the PS file down as 
much as I could to minimize unnecessary code.

Sincerely, Paul Wessel