[Poppler-bugs] [Bug 84693] Dotted lines not rendered correctly

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84693

--- Comment #16 from Thomas Freitag <Thomas.Freitag at alfa.de> ---
(In reply to Albert Astals Cid from comment #15)
> I see some small changes in rendering in
> page 60 of bug-poppler77549-3.pdf (bottom right)
> and
> page 114 of title_font_compresses.pdf
> 
> Not sure if you have those files
> 

I have bug-poppler77549-3.pdf, but I can't find title_font_compresses.pdf.

I looked at the page 60 and can confirm that the output is different with and
without the patch, but to be true, I can't see the difference, neither in
comparing the PNG's nor by looking at the difference picture, even if rendered
with 300 dpi. So I created an histogram of the difference picture (300 dpi,
colorspace grey):

  Histogram:
 155530745: (  0,  0,  0) #000000 gray(0,0,0)
         1: (  0,  0,  0) #000000 gray(0,0,0)
         3: (  1,  1,  1) #010101 gray(1,1,1)
        18: (  2,  2,  2) #020202 gray(2,2,2)
        14: (  3,  3,  3) #030303 gray(3,3,3)
        12: (  4,  4,  4) #040404 gray(4,4,4)
         1: (  5,  5,  5) #050505 gray(5,5,5)
         1: (  6,  6,  6) #060606 gray(6,6,6)
         5: ( 18, 18, 18) #121212 gray(18,18,18)

I interprete this that from round about 155 million pixels there are 55 pixels
different, with a highest difference of 18, so not completely different but
there are differences in anti aliasing effects.
And when I look at the page itself I encounter that there are a lot "dashed"
vertical or horizontal lines, and my patch omit join styles for horizontal and
vertical lines, which seems to be correct according to the PDF spec.

If You have another opinion please give me more information where You worry
about.

If You think that the differences of title_font_compresses.pdf has other
reasons please send me that pdf so that I can have a look at it.

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