Use floats in radial shading code, also fix some whitespace inconsistencies.
Use floats in radial shading code, also fix some whitespace inconsistencies.

Ignore-this: db46d129e0e6c1eaae93a2cf2663bbf7

darcs-hash:20100626194738-86a4e-4fef5cb07dd8ccc3dd9d9b7f317f07cb09cd148f.gz

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