Improved rendering of shadings type6 and type7.
Improved rendering of shadings type6 and type7.

Ignore-this: ab8d04d777b79ac08a18fa0981b9c62d

darcs-hash:20100419013806-86a4e-3e9ae0718eb46813121c29c823166ea04ce290c5.gz

nqv/mupdf,nqv/mupdf,nqv/mupdf,nqv/mupdf,nqv/mupdf,nqv/mupdf