performance problems and possible remedies?
by Yale Zhang
Hi. I'm using Inkscape to author a comic and the slow speed for certain
things is very annoying. I'm already have OpenMP turned on and using 4
1. *large blurs are slow* - I'm an expert with writing SIMD code, so I was
thinking about vectorizing the Gaussian IIR filter with SIMD intrinsics,
even though it's harder than for a FIR. But I noticed there isn't any SIMD
code in Inkscape so does that mean it's something to avoid.
I'm pretty sure no current compiler is smart enough to vectorize it, and
besides, Inkscape is compiled with -O2, meaning -ftree-vectorize isn't on
2. *when there's a large image (raster based) background - scrolling in a
zoomed region is very slow*
I compiled the latest 0.49 code with GCC profiling and it shows this:
33.98 22.47 22.47 exp2l
21.29 36.55 14.08 log2l
17.57 48.17 11.62 pow
7.12 52.88 4.71 658 0.01 0.01
6.72 57.32 4.44 563 0.01 0.01
5.51 60.96 3.64 1216 0.00 0.00
5.23 64.42 3.46 internal_modf
0.59 64.81 0.39 _mcount_private
0.41 65.08 0.27 __fentry__
0.12 65.16 0.08 GC_mark_from
0.09 65.22 0.06 5579 0.00 0.00
Geom::parse_svg_path(char const*, Geom::SVGPathSink&)
0.06 65.26 0.04 35320 0.00 0.00
std::allocator<Geom::Path> > const&, Geom::Affine const&)
0.06 65.30 0.04 8 0.01 0.01
0.05 65.33 0.03 885444 0.00 0.00
std::vector<Geom::Linear, std::allocator<Geom::Linear> > >, unsigned long
long, Geom::Linear const&)
The cost is absolutely dominated by ink_cairo_surface_srgb_to_linear() and
ink_cairo_surface_linear_to_srgb(). My first instinct was to optimize
those 2 functions, but then I thought why are those even being called every
time I scroll through the image?
Why not convert the images up front to linear and stay that way in memory?
If that can't be done, then my optimization approach is:
1. replace ink_cairo_surface_srgb_to_linear() with a simple 3rd degree
polynomial approximation (0.902590573087882 - 0.010238759806148x +
0.002825455367280x^2 + 0.000004414767235x^3) and vectorize with SSE
intrinsics. The approximation was calculated by minimizing the square error
(maxError = 0.313) over the range [10, 255]. For x < 10, it uses simple
2. replace ink_surface_linear_to_srgb() with a vectorized implementation
of pow(). Unlike srgb_to_linear(), a low degree polynomial can't be used
due to the curve having larger high order derivatives. An alternative would
be piece wise, low order polynomials.
The main question I have is what degree of accuracy is desired? Certainly,
it doesn't need double precision pow() since the input is only 8 bits! Is
+- 0.5 from the true value (before quantization) OK or do people depend on
getting pixel perfect results?
6 years, 6 months
Create releases more regularly
by Sebastian Zartner
I initially asked at
was told to better post my request to this mailing list.
I wonder if it wouldn't be possible to create releases more regularly.
Currently there are many months or even years between each release of
Bug fixes should get out more quickly and it should be possible to try out
new features of upcoming versions. Most users don't have the possibility to
build Inkscape by their own, so they have to wait for the next release.
Unfortunately the provided development downloads are not synchronized,
hosted on different third-party web sites and out of date (currently
especially the Windows version).
So I suggest to create a (more or less) fixed fast release cycle for normal
releases (e.g. every two or three months) and periodically (e.g. every one
or two weeks) create alpha versions.
Alpha versions should be built (maybe even automatically) for all supported
OSes and hosted directly on inkscape.org.
7 years, 1 month
Re: [Inkscape-devel] Devlibs 46 too slow
by Mark Titchener
I tried your modified build with an NVidia Quadro 1000M on Windows 7 and it
seemed okay to me.
> Le Jeudi 21 novembre 2013 9h09, Nicolas Dufour <nicoduf@...48...> a ?crit
> > I'm still investigating the issue, and just found out that the computers
> > used to reproduced the bug were all using an Intel GPU. Tests with an
> > GeForce 210 (GT218) show no slowness at all.
> Could some Windows users help me? I'd like to confirm the slowness only
> affects Intel graphics cards. Could you test a modified Inkscape binary
> (from ftp://download.tuxfamily.org/inkscape/inkscape-12282-cairo-184.108.40.206z),
> give your graphic card model and tell me if it's slow or not? IMHO it could
> be a blocker for 0.49 on Windows.
7 years, 1 month
non-Unicode symbol fonts do not work on Windows. Bug 165665. Do we need the flag USE_PANGO_WIN32 ?
by Alvin Penner
ref : https://bugs.launchpad.net/inkscape/+bug/165665
I believe this bug can be fixed by disabling the flag USE_PANGO_WIN32 in
line 19 of src/libnrtype/FontFactory.h. When I do this on Windows XP, I gain
about 35 new fonts. Not all of these new fonts are useable, but the most
interesting ones, such as CommercialPi, Symbol, Technic, Webdings,
Wingdings, MonoType Sorts, TechnicLite are working well, both in Inkscape
and in IE9.
This is a Windows-specific bug which hides symbol fonts, and does not
occur in Gimp 2.6 on Win XP. As far as I can tell, the Gimp source code does
not contain any analogue or equivalent of the flag USE_PANGO_WIN32.
Would there be any objection if I disable this flag, or does it serve a
specific purpose that is essential?
- Alvin Penner
View this message in context: http://old.nabble.com/non-Unicode-symbol-fonts-do-not-work-on-Windows.-Bu...
Sent from the Inkscape - Dev mailing list archive at Nabble.com.
7 years, 10 months
C++11 for Experimental Branch?
by Tavmjong Bah
I noticed a bunch of 'for' loops in Liam's code and that got me
wondering about using C++11 in the experimental branch as 'auto' is so
much nicer that "std::map<SPDocument*,int>::iterator iter". When can we
start using C++11?
I noticed that http://wiki.inkscape.org/wiki/index.php/C%2B%2B11 only
shows results for one Window's compiler. Is there a test program we can
run? Fedora 20 is using GCC 4.8 and clang 3.4; both support 'auto' (GCC
8 years, 4 months
0.91 Bug Hunt Status
by Bryce Harrington
Development focus: 0.91.x series
Pts Bug Age Date Assignee Description
=== === === ==== ======== ===========
6 1299948 0 05/11 Liam P. White LPEs with linked paths sometimes do not recalculate after undo
6 1310266 0 05/10 jazzynico Update the man page with '-i -j' for plain SVG export options
6 1315416 0 05/03 jazzynico [0.91 Tutorial Review] issues with "Basic" tutorial
6 1315453 0 05/05 Ryan Lerch [0.91 Tutorial Review] issues with "Shapes" tutorial
6 1315457 0 05/06 Ryan Lerch [0.91 Tutorial Review] issues with "Advanced" tutorial
6 1315480 0 05/06 Ryan Lerch [0.91 Tutorial Review] issues with " Bitmap tracing" tutorial
6 1315483 0 05/06 Ryan Lerch [0.91 Tutorial Review] issues with " Calligraphy" tutorial
6 1315485 0 05/05 Ryan Lerch [0.91 Tutorial Review] issues with "Elements of Design" tutorial
6 1315487 0 05/06 Ryan Lerch [0.91 Tutorial Review] issues with "tips and tricks" tutorial
6 1316591 0 05/06 Mohamed IKBEL Boulabiar copy-paste typo in the dbus document interface
6 1318289 0 05/11 Masato HASHIMOTO preferences > bitmap > rendering shows po file headers
6 1318345 0 05/11 Masato HASHIMOTO untranslatable strings in trunk-r13348
12 1318532 0 05/12 Masato HASHIMOTO Extension/Guides creator: Render fails
3 1247448 0 05/10 bcrowell INKSCAPE_PORTABLE_PROFILE_DIR should be on man page
3 1317140 0 05/09 jazzynico Tutorials: supported generic font names in trunk have changed
3 1318328 0 05/11 Masato HASHIMOTO typo in trunk-r13348
3 1318671 0 05/12 Masato HASHIMOTO url for New in This Version is obsolete
3 1314910 0 05/01 Claus Johansen Font size specification
Total Score: 99 / 1500
12, 9, 6, 3 for importances critical, high, medium and low
+1 point per year of the bug report's age
x2 if bug is tagged 'regression'
x2 if closed the week it was declared Bug of the Week
Bug of the Week
Ryan Lerch closed 30 points worth of bugs, due to hammering our
tutorials into shape. Ryan, would you please find us a good Bug of the
Week for May 12-18?
8 years, 5 months
0.48.5 packages needed
by Krzysztof Kosiński
The Windows installer is up at sourceforge.net, and the tarballs are
at Launchpad. We still need the portable version and the Mac bundle
before we can announce the new release. Anyone up for it?
8 years, 8 months
GSoC Project Update
by Krzysztof Kosiński
The midterm evaluations are near due, so here's a public update on my
The schedule this year was very bad for me, and dealing with
university stuff ate most of my time in the first half of the project,
so I didn't do nearly as much as I hoped for. I have however made a
prototype CGAL-based implementation of boolops. It is available in
2Geom trunk; you have to have CGAL installed, its headers available in
your default include path, and set the CMake option CGAL_TOYS=ON to
compile it. Saying "sudo apt-get install libcgal-dev" suffices to
satisfy the first two requirements on Ubuntu 14.04.
The results of playing with this toy are rather disappointing. CGAL
produces visibly imprecise results even for simple shapes (see
attached pictures), and for some inputs (e.g. when sliding two bananas
over each other so that they nearly match) it crashes with an
assertion. It seems that its boolean operation algorithm for Beziers
is of very poor quality. This means I will have to write the boolops
code from scratch.
I've found a MIT-licensed Objective-C library that implements boolops
on Bezier paths, which may serve as an inspiration.
During the remaining time before midterm, I'll work on path-related
APIs in 2Geom. This will be useful when implementing boolops, and will
allow us to get rid of ugly ancient stuff in Inkscape, such as
SPCurve. After the midterm, I will have to complete a final assignment
at the university, and should have much more time to get useful work
done in the second half of the project.
8 years, 8 months
Math function problem
by Jabiertxo Arraiza Cenoz
Hi to all.
I try this in my debian calculator:
"4 / 3 * (sqrt(2) - 1)" and return 0,55228475
in C++ return 0.414214
I want 0,55228475.
Where i lost? I have the cmath header
8 years, 9 months
Threading problem in extension system
by Johan Engelen
There is a threading problem with the extension system. It results in
a crash when saving a document and quitting while the save is happening.
Have a look here:
I don't know enough about glib's threading to fix this bug. I do not
fully understand where the execution flow is going after the fork
(/src/extension/implementation/script.cpp, line 1017,
_main_loop->run();), nor where the fork is terminated.
I hope someone who knows more about this can have a look. I'm afraid it
may lead to pretty weird bugs when running time consuming extensions and
doing stuff meanwhile. (gdb reports illegal mem accesses when doing
stuff while an extension is running, for example).
Is this asynchronous extension execution so important, or can we disable
it for now to improve stability?
8 years, 9 months