[Poppler-bugs] [Bug 90570] pdftoppm shows black line artifacts with aaVector enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90570

--- Comment #1 from William Bader <williambader at hotmail.com> ---
Created attachment 115961
  --> https://bugs.freedesktop.org/attachment.cgi?id=115961&action=edit
incorrect output with diagonal line artifacts

output from
pdftoppm -png 203170.pdf 203170
The png is 1/10 the size of the ppm and shows the problem also.
The black diagonal lines show in all output formats, so the problem is in the
splash rasterization and not in the final image file generation.
The lines seem to be one pixel in the image, no matter what I use as the
resolution, so maybe a fill or crop calculation is not symmetrical and two
adjacent regions end up with an unfilled gap between them.
xpdf-3.04 works correctly, but the splash code has diverged enough that it is
hard to compare.  vectorAntialias is used mostly in Splash.cc.
This PDF uses Splash::blitImageClipped, Splash::fillWithPattern and
Splash::gouraudTriangleShadedFill.

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