Ubuntu
human-icon-theme package

Very bloated SVG in notification icons

Bug #361667 reported by Krzysztof Kosinski on 2009-04-15

Affects		Status	Importance	Assigned to	Milestone
	human-icon-theme (Ubuntu)	New	Undecided	Unassigned

Bug Description

Binary package hint: human-icon-theme

Icons like notification-network-wireless-high in the Human theme are very large (100 KB). The problem stems from the fact that Adobe Illustrator injects a definition of its Polka Dot pattern into the file, but it's not used anywhere, and moreover it's not inside <svg:defs>, which means it is not valid SVG at all. This can be fixed by opening the file in Inkscape and deleting the offending <svg:pattern> element in the XML editor. The size of most icons drops by c.a. 90% as a result of this.

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Erik Dahlström (ed-opera) wrote on 2009-04-15:

Note that It's perfectly valid to have <pattern> outside of <defs>, see the svg spec(s).

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Krzysztof Kosinski (tweenk) wrote on 2009-04-15:

Yes, I checked the specification more thoroughly and it doesn't prohibit doing this. Still, the icons could be much smaller if the unused pattern definition was removed.

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codedread (codedread) wrote on 2009-04-15:

Do you have a link to one of these icons? I have been working on a project that cleans up SVG files: http://launchpad.net/scour and I'd be curious to see if I handle this scenario yet.

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Krzysztof Kosinski (tweenk) wrote on 2009-04-15:

Icon bloat fixes Edit (368.7 KiB, text/plain)

This patch reduces the size of scalable icons when unpacked by c.a. 6 MB

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Krzysztof Kosinski (tweenk) wrote on 2009-04-15:

codedread:
bzr co -r 90 http://bazaar.launchpad.net/%7Eubuntu-art-pkg/human-icon-theme/ubuntu/ human-icon-theme-bzr

Example icon with this problem: scalable/status/notification-audio-next.svg

By the way, the patch is against current BZR (revision 90)

codedread (codedread) on 2009-04-15

summary:

- Very bloated and invalid SVG in notification icons
+ Very bloated SVG in notification icons

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codedread (codedread) wrote on 2009-04-15:

Ok, I've updated scour to remove unreferenced patterns and gradients outside of a <defs> element. Please give it a try on your icons and let me know the results. For notification-audio-next.svg I get a visually identical file with:

Original file size: 102987 kb; new file size: 3624 kb (0.035x)

You can download scour at http://codedread.com/scour/ or from the bzr trunk on lp

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codedread (codedread) wrote on 2009-04-28:

FYI, latest trunk version of scour (0.11) now produces:

File: fulltests/notification-audio-next.svg
Time taken: 0.3s
Number of unreferenced id attributes removed: 0
Number of elements removed: 4
Number of attributes removed: 6
Number of style properties fixed: 0
Number of raster images embedded inline: 0
Number of path segments reduced/removed: 23
Number of bytes saved in path data: 430
Original file size: 102987 bytes; new file size: 3424 bytes (0.033x)