[Poppler-bugs] [Bug 61719] Image renders as black blob

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=61719

--- Comment #11 from Thomas Freitag <Thomas.Freitag at alfa.de> ---
(In reply to comment #10)
> Thomas two things i was wondering, have you run this on "default" mode and
> seen how much stuff it changes?

Hmmh, I started a test with the wrong implementation (looking at the line
width), but I broke it after 150 tests because 30% of tests failed. It's now
probably better, because I reduced the limit from less than 1 pixel to less
than 0.2 pixel and look correctly at the width or height of the clipping area. 
BUT: The problem here is that a PDF is converted to EPS, loosing it tiling
pattern, and then converted back to PDF. So it's not a "normal" PDF, and since
I don't get a "normal" PDF with such a problem I don't like to change the
accepted rendering behaviour.
And because the "pattern" are thin lines, I think that to choose "Enhance thin
lines" is the right switch (even if somewhat misused, but I don't want to
increase the number of switches every time we get a new, not general solvable
problem)

> 
> Also, do you think that instead of calculating xMinFP all the time we create
> a SplashXPath maybe we could do it just when we're going to use it?

In the constructor of XPath the path elements are already adjusted according to
the hints, so the result is no more usable for our case. So we have to run once
again over the path points and transform them to get the bounding box. But if
You think that it is too expensive to do it always in the constructor and that
we need it nowhere else in futur, of course it is doable (and at least we will
only do it if we have a "single point width or height rectangle"). Just give a
go if You accept the output behaviour but want to have it only if definitely
needed and I'll implement a helper function in Splash.

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