[Okular-devel] [okular] [Bug 348580] New: PDF gradient incorrectly rendered

[vanboxem.ruben at gmail.com]

https://bugs.kde.org/show_bug.cgi?id=348580

            Bug ID: 348580
           Summary: PDF gradient incorrectly rendered
           Product: okular
           Version: 0.22.1
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: vanboxem.ruben at gmail.com

PDF gradients are incorrectly rendered in Okular.


Reproducible: Always

Steps to Reproduce:
When rendering the PDF file generated by pdflatex from this source:

\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{shadings}

\begin{document}
\begin{tikzpicture}
\shade[shading=color wheel, opacity=.6, shading angle=220] (0,0) circle (1);
\end{tikzpicture}
\end{document}

Actual Results:  
Okular renders this incorrectly: grid lines and very bad gradient resolution
(see screenshots). The grid lines disappear when "shading angle=220" is removed
from the source.

Expected Results:  
The gradient should render smoothly (see screenshots)

IIRC, I reported a bug about this to qpdfview, which didn't show the grid lines
as okular does, but did show a squar texture pattern, albeit interpolated.

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