[Clipart] thumbnails size

[Carl Worth]

On Wed, 1 Sep 2004 11:48:42 -0700 (PDT), Bryce Harrington wrote:
> One thing to look at regarding thumbnails is using svg2png instead of
> inkscape, because (in theory) it should run faster.

I've started taking a look at this.

We've got svg2png installed on the freedesktop.org server so others can
play with this too.

I have no idea how fast inkscape is, but svg2png takes about 2 minutes
to make width-80 thumbnails for everything in release 0.06. It also
failed to parse 6 of the images, (I'm not sure why yet).

	~/openclipart-0.06:$ time for svg in `find . -name '*.svg'`; do svg2png --width=80 $svg ${svg/.svg/-svg2png.png}; done
	svg2png: failed to render ./icons/palette.svg
	svg2png: failed to render ./Examples/00_strawberry_border/strawberry_border.svg
	svg2png: failed to render ./computer/palette.svg
	svg2png: failed to render ./decorations/flourish_two_vertical_01.svg
	svg2png: failed to render ./flourish/flourish_two_horizontal_01.svg
	svg2png: failed to render ./shapes/flourish_two_vertical_01.svg
	
	real    2m0.831s
	user    1m12.080s
	sys     0m10.580s

Note that this was on the second run of this command. The first run took
over 10 minutes, (presumably the disk cache helped a lot the second
time).

I've looked through a few directories of the resulting images, and
beyond those 6 failures, svg2png still has a few rendering problems,
(some of these are known bugs in cairo already):

	1) Cairo does not properly dash splines

	2) Cairo is not apply caps properly to all dash segments

	3) Cairo is not properly putting caps on all sub-strokes in a
           complex path

	4) On some stroked ellipses, svg2png is drawing a segmeent from
           the center out to one edge.

	5) There seems to be a disagreement between svg2png and inkscape
           on the opacity of gradients. This is most noticeable in
           seahorse.svg.

Other than those issues, the results are quite comparable for the most
part, (at least for the few directories of images I looked through).

So, it doesn't look like svg2png is quite ready today, (from the point
of view of functionality), but none of these bugs look impossibly hard.

So, thank you very much, Open Clipart Library, for the large number of
test cases! This is great for svg2png/cairo, as we've definitely seen a
new bug or two here. Any help fixing those would of course be
appreciated.

-Carl