Replacing the entire body of PreparePatternForUntiledDrawing with
{
aPattern->SetExtend(gfxPattern::EXTEND_NONE);
aPattern->SetFilter(gfxPattern::FILTER_FAST);
}
reproduces the 3.6 behavior. Replacing it with
{
aPattern->SetExtend(gfxPattern::EXTEND_PAD);
aPattern->SetFilter(gfxPattern::FILTER_FAST);
}
produces behavior which is _nearly_ correct; the image itself is
upscaled correctly (instead of being gradientified and fattened), and
there aren't black lines under the image at any zoom level, but some of
the lines still get black blobs at their right edges at some zoom
levels, and also now sometimes at their left edges. However, this
happens much less often.
Based on this I feel relatively confident in diagnosing a video driver
bug, and my recommendation is still to rip out the entire mess and use
EXTEND_PAD and a good filter unconditionally, then to work with the
X.org folks to get the video drivers fixed.
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https://bugs.launchpad.net/bugs/263661
Title:
Black Line appears next to gif and png images
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