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
cores.
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
by default.
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
ink_cairo_surface_srgb_to_linear(_cairo_surface*)
6.72 57.32 4.44 563 0.01 0.01
ink_cairo_surface_linear_to_srgb(_cairo_surface*)
5.51 60.96 3.64 1216 0.00 0.00
Inkscape::Filters::FilterGaussian::~FilterGaussian()
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
bounds_exact_transformed(std::vector<Geom::Path,
std::allocator<Geom::Path> > const&, Geom::Affine const&)
0.06 65.30 0.04 8 0.01 0.01
convert_pixbuf_normal_to_argb32(_GdkPixbuf*)
0.05 65.33 0.03 885444 0.00 0.00
std::vector<Geom::Linear, std::allocator<Geom::Linear>
>::_M_fill_insert(__gnu_cxx::__normal_iterator<Geom::Linear*,
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
scaling.
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?
UJ
6 years, 5 months
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?
tia
- Alvin Penner
--
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7 years, 10 months
Improved gears extension
by Jürgen Weigert
Just saw braingram's rack gear extension coming in. Nice work! Thank you.
But that reminds me that I also have a small contribution to share. Here is
an enhanced version of the gears plugin, please also consider this for
future inclusion
git@...2977...:jnweiger/inkscape-extensions-gears-dev.git
cheers, JW-
8 years, 10 months
Mac OS X Mountain Lion x86_64 packaging of 0.48.4
by Valerio Aimale
Hello,
I am not an official packager, but I was eager to have an updated
version of Inkscape for Mac OS X and I noticed that nobody is packaging
the new version.
I've packaged it for Mountain Lion and x86_64. It should be considered a
beta packaging. I've packaged from version 0.48+devel r12005
You can download it at:
https://rapidshare.com/files/3885726044/Inkscape_MountainLion_x86_64.dmg
The Mac Os X packaging infrastructure in the source tree is a bit
ancient. Things I've noticed:
- configure.ac uses syntax that is not conforming anymore with
autoconf/automake/authohear 1.13. Going forward that should be updated.
- the scripts osx-build.sh os-app.sh needs update for the newest Xcode
versions. they don't work out of the box.
- the dylib base relocation infrastructure needed to be rewritten
- the Platypus-derived ScriptExec executable might not be needed anymore
- in this version, the app bundle executes the sh script directly.
Features:
- The version I packaged runs gtk-2.0+quartz. It does not need
X11/Xquartz anymore to run. This is the direction GIMP has gone to as well.
- It uses the same theme as GIMP. I think it's a good consistency
decision, and it's the theme that looks best on Mtn Lion.
If somebody want to try and report problems, I'd appreciate it
Valerio
9 years, 1 month
Devlibs 46 too slow
by LucaDC
After updating to devlibs r46 moving objects around becomes too slow in my
system and Inkscape is nearly unusable even for simple drawings.
Open a new document, draw a rectangle and move it around: the lag is huge.
Even changings of the cursor when hovering over it are updated with delays
of 1 s or more. Moving and snapping guides (not to guides), on the other
hand, is very fast.
My system is a Pentium 4, 3,2 GHz, 2 Gb RAM with Windows XP SP3.
Reverting to devlibs r45 (trunk 12277) gives back the previous (acceptable)
response time. I know my system is old, but with r45 it's fine for all my
needs.
Isn't this terrible performance drop avoidable? Inkscape is already not a
jaguar...
Regards.
Luca
--
View this message in context: http://inkscape.13.x6.nabble.com/Devlibs-46-too-slow-tp4966631.html
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9 years, 3 months
Fwd: Re: [scribus-dev] C++11
by Johan Engelen
Hi all,
I asked the Scribus guys what their plans are regarding C++11. They
had not thought about it much, but I got a very interesting reply, that
is relevant for us too. Please read below.
regards,
Johan
-------- Original Message --------
From: - Thu Nov 07 23:35:19 2013
Date: Thu, 07 Nov 2013 02:21:04 +0100
From: Jean Ghali <jghali@...373...>
To: Scribus Development Mailing List <scribus-dev@...3050...>,
jbc.engelen@...2592...
Subject: Re: [scribus-dev] C++11
Hi,
For making the switch to C++11, all C++ dependencies have to be compiled using C++11 too.
It is indeed dangerous to link C++11 objects and C++ objects compiled according to
previous standards:
- http://gcc.gnu.org/wiki/Cxx11AbiCompatibility
- http://stackoverflow.com/questions/9408656/do-we-need-to-recompile-librar...
- http://stackoverflow.com/questions/10065055/why-is-stdlist-bigger-on-c11
So basically the main requirements for us to switch to C++11 would be that qt binaries
provided by distros are compiled according to C++11. I don't known if this is the case
currently but i doubt it.
Cheers,
Jean Ghali
Le 06/11/2013 20:05, Johan Engelen a écrit :
> Hi all,
> I'm rooting for requiring C++11 for lib2geom ASAP. How badly would this hurt Scribus
> development? ;)
> Are there any plans about when to make the switch to C++11 for Scribus?
>
> (I'm not subscribed to the list, so please also send replies directly to my address)
>
> Cheers,
> Johan
> (Inkscape and 2geom developer)
9 years, 3 months
Re: [Inkscape-devel] Inkscape and SMIL support
by Susan Spencer
As mentioned previously in this thread,
details of fundraising are typically
discussed *after* a proper estimate is
developed.
If this is a serious discussion (which I believe it is)
then the following actions are up next:
1. Identify the programmers, testers, documenters and users
who will participate. (Participants can assume multiple roles)
2. The programmers collaborate to create & share the
requirements and constraints
3. The testers specify & share the testing and signoff
requirements, based on output of #2
4. All participants specify documentation requirements to meet
needs of both the users and the future developers/maintainers
5. Estimate the cost & delivery schedule
6. Design the fundraising campaign (which is another separate effort)
if you're going to raise funds from the public then
you can't be code cowboys about this, no matter
if you believe this is a relatively small effort.
Performing the above steps and publishing the results
helps build momentum for public monetary support
and creates tremendous public confidence.
it also gives the tech media something to report
regularly building up to the fundraising
start date. Use the machine wisely, publicity never hurts!
Assuming that remote collaboration results require
more time than face-to-face sprints,
we can shoot for 30 to 60 days for #1-5,
30 days maximum for #6,
so max 90 days till fundraising.
My skills aren't in programming,
but if you would like me to I can help with
project development & fundraising.
If there are others more connected to Inkscape than I
who would like to step up for this work, please do!
- Susan
>
9 years, 3 months
Removing ID attribute from group (XML editor) causes crash
by Bryan Hoyt | Brush Technology
While editing an Inkscape-created document, if I delete the ID attribute of
a group (or any other element, on further investigation) using the XML
editor, and then select that element in the visual editor, Inkscape crashes.
The ID in question is not referenced elsewhere in the document.
Is it valid SVG to have objects without IDs? It certainly seems like it
should be, particularly for hand-crafted SVG.
I can reproduce this trivially in Inkscape's trunk build from 22 Sep 2013
on a blank document with nothing but a plain rectangle.
- Bryan
--
Bryan Hoyt, *Software Developer* -- Brush Technology
*Ph:* +64 3 741 1204 *Mobile:* +64 21 238 7955
*Web:* brush.co.nz
9 years, 3 months
Inkscape and SMIL support
by HadiM
Hi guys,
I wonder to know if you have a mid term plan to add animation support on
inkscape (with a nice GUI and all that stuff...). I you do, are you
planning to use SMIL or DOM manipulation script ?
I saw on your wiki some pages related to animation support but they are all
old and do not seems updated.
If you don't have time to work on it, could you consider launching an
indigogo or kickstarter campaign to raise some funds. I am sure many people
will give you money to give that support.
In my opinion with HTML5 / CSS3, modern browser, video support and
inkscape, animation support in inkscape is the only key missing to be able
te replace PowerPoint.
I except to see many software based on SVG+animation emerge in the next few
years with the HTML5 explosion. It will be sad to see a new proprietary
software emerging and becoming the standard in SVG animation.
Best,
--
HadiM
9 years, 3 months
