[poppler] [PATCH] Improve linear gradients in cairo backend

[Carlos Garcia Campos]

Hi all, 

when drawing gradients with cairo, we don't need to fill a path for
every region, we can just fill the bounding box with the gradient
pattern, but this only works when shading->getExtend0() ==
shading->getExtend1(), since we can use CAIRO_EXTEND_NONE when they are
FALSE and CAIRO_EXTEND_PAD when they are TRUE. When they are different,
we could just use the current approach, adding a path for every region.
This is exactly what the attached patch does.

-- 
Carlos Garcia Campos
PGP key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x523E6462
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