It seems that this lack of functionality is affecting pdf viewers/backends such as poppler (see bug #5589):
See how this manifests itself visually:
The problem is present in latest cairo 1.4.6 / poppler 0.5.4 / evince 0.9.0.
Using cairo 1.4.10, poppler 0.5.9 and evince 0.9.2, I think I get even worse results (see atached image acrobatvsevince.png).
I hope it helps,
Created attachment 10739 [details]
bitmaps display in acroread and evince
I guess the bug above was wrong reported, because the bug might have been introduced in poppler-0.5.9 (see bug 5589 for that).
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