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https://issues.apache.org/jira/browse/FOP-2846?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16776412#comment-16776412
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Jan Tošovský commented on FOP-2846:
-----------------------------------
Looking into FOP/Batik code I found transparency is supported for both stroke
and fills, but only if specified by fill-opacity/stroke-opacity properties. If
general opacity is used, the graphics is considered as too complex for
rendering using primitive methods, so it is rasterized.
Parsing fill-opacity is done in batik-bridge class
PaintServer.convertFillPaint()
Parsing opacity is done in batik-bridge classes
AbstractGraphicsNodeBridge.buildGraphicsNode() -> CSSUtilities.convertOpacity()
Deciding if element is rasterized is done in batik-gvt class
AbstractGraphicsNode.isOffscreenBufferNeeded()
I suppose in case of SVG path elements (+ other shapes) the general opacity
could be treated in same way as fill-opacity and stroke-opacity and excluded
from cases triggering the rasterization.
> 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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