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Message #126773
[Bug 145604]
I am trying to enable subpixel rendering on poppler and I found my
rendering result is suboptimal. After gdbing into cairo, I am surprise
that cairo is still using the legacy filter as the "default". To the
the situation even worse, cairo removed the interfaces to set the
lcdfiler (cairo_font_options_set_lcd_filter) because "they are too
specific to FreeType".
Well, maybe that is true. But now how can I use the real Freetype
default filter (FIR5) in the newest cairo without pathcing it? I think
maybe manually set a FcPattern is OK but I really do not want to
learn/invoke/rely Fontconfig just for setting a filter that should be
default.
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https://bugs.launchpad.net/bugs/145604
Title:
VRGB sub-pixel hinting causes black-on-black text rendering
Status in libcairo:
Confirmed
Status in cairo package in Ubuntu:
Triaged
Status in compiz package in Ubuntu:
Invalid
Status in compiz-fusion-plugins-main package in Ubuntu:
Invalid
Bug description:
Binary package hint: libcairo2
There is a long-standing problem (Gutsy, Hardy, Intrepid - possibly
Jaunty too) with sub-pixel rendering which affects metacity or compiz
composition (see the images attached to this bug) when VRGB is chosen
as the sub-pixel format. Comment #15 by MoMaT demonstrates a non-
compiz scenario. My comments #2 and #10 demonstrate the issue with
Compiz enabled.
The underlying issue essentially seems to be: where should sub-pixel
rendering should be done - in libcairo or in the font renderer
(FreeType in this case) ?
There have been two versions of the Ubuntu patch in
libcairo/libcairo2. Reports seem to suggest that both versions may be
responsible for the VRGB problem (however, that supposition needs
checking - see Bob McElrath's comment #19).
We need to be aware that libcairo (libcairo 1.5.4 in Universe) and
libcairo2 (cairo 1.6.0 in Main) are similarly patched and will need
similar fixes.
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