[poppler] Implement Type 4, 5, 6, 7 shadings using cairo mesh gradients

[Carlos Garcia Campos]

Excerpts from Albert Astals Cid's message of lun ene 24 19:53:50 +0100 2011:
> A Dilluns, 24 de gener de 2011, Thomas Freitag va escriure:
> > Am 24.01.2011 14:17, schrieb Carlos Garcia Campos:
> > > Cairo 1.11.2 has a new mesh pattern that can be used to implement 6/7
> > > type gradients. Adrian has an updated poppler branch that implements
> > > mesh gradients in cairo backend:
> > > 
> > > http://cgit.freedesktop.org/~ajohnson/poppler/log/?h=mesh
> > > 
> > > I've tried it and it works great, it fixes bugs #28836 and #32791 (and
> > > maybe others). I haven't pushed the patch yet becuase it contains
> > > minimal changes in Gfx.cc. If nobody objects I'll push it to master
> > > branch only.
> > 
> > I had a quick look at what Adrian has done in Gfc.cc, and think, that is
> > a little bit misusing of out->gouraudTriangleShadedFill( state, shading)
> > and out->patchMeshShadedFill( state, shading):
> > 
> > When these functions returns gTrue, this indicates that all work has
> > already be done in the output device. How Adrian implements it is very
> > special to Cairo. But it is quite ease to change it:
> > Just move the lines
> 
> Agreed with Thomas.

contentIsHidden() is private to Gfx, and all other patterns do the
clip and fill in Gfx

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