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Prevent vectorizing images when creating svg

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This change deletes the potrace rules from imagemagick. Otherwise it tries to use potrace, which is not installed and would create ugly monochrome slides. Without this change, d8350f813c/bbb-common-web/src/main/java/org/bigbluebutton/presentation/imp/SvgImageCreatorImp.java (L223) fails in the docker version of BBB. The users see this effect as blank slides. This path is triggered by type 3 fonts in the page. 

Background: bbb-web tries to avoid pdftocairo for pages with type 3 fonts, see https://gitlab.freedesktop.org/poppler/poppler/-/issues/268
And imagemagick changed its behaviour around version 7.0.8-65, see https://legacy.imagemagick.org/discourse-server/viewtopic.php?t=36777
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rottaran 2022-01-27 22:23:55 +01:00 committed by GitHub
parent f2f929f1bb
commit cdfdfca51b
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mod/bbb-web/Dockerfile
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@ -81,7 +81,9 @@ RUN mkdir -p /usr/share/bigbluebutton/blank \
https://raw.githubusercontent.com/bigbluebutton/bigbluebutton/v2.4.0/bigbluebutton-config/slides/blank-thumb.png \
https://raw.githubusercontent.com/bigbluebutton/bigbluebutton/v2.4.0/bigbluebutton-config/slides/blank-presentation.pdf \
https://raw.githubusercontent.com/bigbluebutton/bigbluebutton/v2.4.0/bigbluebutton-config/slides/blank-png.png \
&& sed -i 's/<policy domain="coder" rights="none" pattern="PDF" \/>/<policy domain="coder" rights="write" pattern="PDF" \/>/g' /etc/ImageMagick-6/policy.xml
&& sed -i 's/<policy domain="coder" rights="none" pattern="PDF" \/>/<policy domain="coder" rights="write" pattern="PDF" \/>/g' /etc/ImageMagick-6/policy.xml \
&& sed -i '/potrace/d' /etc/ImageMagick-6/delegates.xml
# get bbb-web
COPY --from=builder /dist /usr/share/bbb-web