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https://issues.apache.org/jira/browse/FOP-2846?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16778535#comment-16778535
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Jan Tošovský commented on FOP-2846:
-----------------------------------
I've tweaked Batik code a bit to handle opacity of shapes in same way as
fill/stroke opacity if these are not defined. Now I understand why the result
is rasterized as I got unexpected results. The fill and stroke are both
rendered with the same opacity, so overlapping parts (inner half of strokes)
are darker. So both fill and stroke have to be rendered opaque to some
temporary canvas and the transparency has to be applied to the result. This
cannot be done with simple vector shapes.
> SVG not handled / rendered / embedded properly
> ----------------------------------------------
>
> Key: FOP-2846
> URL: https://issues.apache.org/jira/browse/FOP-2846
> Project: FOP
> Issue Type: Bug
> Affects Versions: 2.3
> Reporter: Björn Kautler
> Priority: Major
> Attachments: image-2019-02-21-12-15-39-802.png,
> image-2019-02-21-12-17-26-206.png, image-2019-02-21-13-35-21-628.png,
> image-2019-02-21-14-41-29-088.png, image-2019-02-21-14-42-11-550.png,
> med-folder-journal.svg, roadsign-attention.svg, svg-test.fo, svg-test.pdf
>
>
> It seems FOP does not handle all SVGs properly.
> The attached [^svg-test.fo] which displays the attached files
> [^roadsign-attention.svg] and [^med-folder-journal.svg] demonstrate the
> problem.
> The result of {{fop-2.3/fop/fop svg-test.fo svg-test.pdf}} can be seen in
> [^svg-test.pdf], especially if you zoom in.
> The {{med-folder-journal.svg}} is properly displayed and scaled, the
> {{roadsign-attention.svg}} looks like the triangle is rendered to pixels that
> scale up, but the exclamation mark properly scales.
> Here the PDF content as screenshot on 1200%:
> !image-2019-02-21-12-15-39-802.png!
> Using the code at [https://xmlgraphics.apache.org/batik/using/swing.html]
> shows that Batik 1.10 can perfectly fine scale up the SVG:
> !image-2019-02-21-12-17-26-206.png!
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