[Poppler-bugs] [Bug 105905] Blank page when tiling pattern's cell is too far

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105905

--- Comment #6 from Marek Kasik <mkasik at redhat.com> ---
Hi,

I'm sorry for late answer.

(In reply to Jason Crain from comment #5)
> I'm not sure if I understand how this works. Can you tell me if I've got
> this right?

I think that you've got this right :).

> You're transforming the translation components of pmat by pmat^(-1) to find
> how far that point is in the pattern's coordinate system. You set xoffset
> and yoffset to the number of repetitions of the pattern that are required to
> get there. Then shift pattern_matrix over by that amount?

Yes, I have to shift the pattern_matrix so that when it is applied to the cairo
context in "cairo_transform (cairo, &pattern_matrix)" we get closer to (0,0).
Otherwise, cairo tries to allocate huge bitmap for the pattern.

I've tested the patch also for different types of translations (scale, skew and
rotation).

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