GIMP Layers

Sven Neumann: online help for gimp 2.6

neo — Mon, 07 Jul 2008 14:45:36 +0000

One of the new features for GIMP 2.6, that I have been working on lately, is support for reading the user manual online. So far the user experience with the GIMP help system has sometimes been somewhat disappointing. The user asks for help and all she gets is an error message telling her that the user manual is not installed. It’s not too difficult to install the user manual, but it’s a large download and the exact procedure differs on each platform/distribution. So we have added the possibility to read the user manual online. Where GIMP 2.4 used to show an error message, this dialog will be shown instead:

My main grief with this is that I implemented the download of the help index using GIO. From a programming point of view this works nicely for local and online help. And in fact it does work nicely on a system that has the HTTP backend installed. But I only just realized that there is very little chance to get this to work on the Windows platform. It appears that only local file I/O is implemented for Win32. That renders GIO/GVFS pretty much useless for a cross-platform application like GIMP. Is there any hope that this could work in time for the 2.6 release? Or do I really have to go through the hassle of adding extra code for Win32, probably using libcurl?

Shlomi Fish: Predicting Three Comebacks

Mon, 07 Jul 2008 09:10:38 +0000

Well, it's a common belief that comebacks in technology don't happen often, but this time I predict three comebacks. I cannot recommend that you base your decisions (much less investment plans) based on it, but here they are.

Comeback #1: Non-x86 Machines

Once upon a time, companies spent a fortune on costy UNIX servers or even IBM mainframes, just to be able to run their operation. Since then, x86-based computers have become faster and more capable, enough to make people be able to run Microsoft Windows NT or Unix-based Operating systems on them. This is now the most popular setup on the Internet for servers (much less clients and workstations).

However, these x86 machines are not as integrated as their non-x86 equivalents (UltraSPARC, PowerPC, etc.), are still much slower (due to the limitations of the x86 architecture vs. the superior RISC family of architectures). This costs in a lot of time of maintenance, many hardware failures, and sub-optimal lifetime. It is well-known that there are some PC XT machines which are still running. However, finding a low-end desktop Pentium I machine that's still OK is an exercise in futility. And even the high-end x86 servers suffer from many problems.

Human time is much more costy than shelling some money for getting a good RISC machine. And with the portability and stability of the GNU system, and portable and free operating systems such as Linux, or the BSDs, you can easily run a server there at ease.

So what can Sun and IBM (and friends) do about it?. They should phase out their own OSes in favour of Linux, as people have grown to dislike Solaris (to say nothing of AIX, HP-UX, or greater brain-damages). Don't get me wrong - Solaris has its place and I'm sure is a fine piece of engineering. But GNU/Linux is better for trying to promote the hardware.

Sun should also make the OpenSolaris licence GPLv2 and GPLv3 compatible, to allow it to borrow code from Linux and other GPLed-products (and vice versa). And they should also start supporting Perl, PHP, CPython, CRuby, Mono etc. etc. instead of just Java or whatever has been hyped. (Similar to what Microsoft have been doing recently for its MS-Windows OSes).

All of this will allow selling more hardware, getting more support and ergo - more profits. I think the transition to non-x86 machines will happen anyhow, but that will make it faster, and much more profitable for them.

Note that it is not the end of either Intel or much less the end of Microsoft. I still see workstations dominated by x86 in the near future, and both MS and Intel are insanely profitable and have enough time to re-invent themselves. But I think (and hope) we'll be seeing more and more non-x86 servers and to a lesser extent workstations.

Comeback #2 : Mandriva

Once upon a time, the Mandriva Linux distribution (formerly Mandrake) was the de-facto standard for home Linux desktops. Then vocal Debian people started spreading a lot of pro-Debian and anti-everything-else FUD, and Ubuntu also became the over-hyped distribution-of-the-moment. Meanwhile, naturally, Mandriva suffered from lack of popularity and negative FUD, but also still continued to improve.

Right now, as Ubuntu Hardy (which I nicknamed "Hardly") tends to hang up or worse so often, and Ubuntu as a general rule seems to be infested with red-tape, it seems that there's an opening for Mandriva and distributions that are very good, but were not as hyped as Ubuntu.

Here are some Israelis who converted away from Ubuntu lately:

These are all Linux experts and FOSS contributors. It's harder to tell what the common joe who wants to install Linux at home will choose. But I think that they will tend to hear a recommendation from the experts, too.

Will Mandriva become the hottest distribution? Maybe not. But it doesn't matter - Mandriva was never about hype. Naturally, Mandriva has had and still have its share of bugs and problems (mostly non-critical). But so do most other distributions, including such whose users were spreading anti-hype against it.

Writing this from a Cooker (which is the Mandriva equivalent of something like Debian Testing or Unstable) system.

Comeback #3: Perl

And now we come to the third and final comeback - Perl. You can often here that "Perl is dead", or that "Perl is dying", etc. It's a matter of image, more than technology or mindshare. Many people would blame it on the anti-Perl FUD we can hear from various sources. But I believe the problem has lied in the Perl world itself. To quote an email I sent:

The Perl technology is in an excellent shape. It's fast, feature-rich, powerful, easy to use and learn, under active development, relatively bug-free, with many automated tests, and with many 1st party, 2nd party and 3rd party enhancements (re CPAN).

However, the Perl community is sick. Not dying - but sick.

This sickness was not caused by external attacks. Instead it was created from within the Perl community. By a leadership/intelligencia who were more keen on writing and selling closed books (see my essay about it) than on promoting the core Perl technology, documentation and community. It was caused by an "official" IRC network (which is still the first hit on a Google search for "irc perl") which is full of ego, abuse and hostility - where kicking, bannings (and seemingly K-lines) are not only common, but tolerated and seem desirable. It was caused by administrators and leaders who became too "busy" (and as a result heavily unproductive) to have time for Perl, which is what have been placing food on their table. It was caused by central sites whose source code and data were hidden from the public due to a lot of unknown bad reasons, and for absolutely no good ones. (We advocate openness after all).

But most of all it was caused by the many competent and active Perl contributors who did not take the initiative to replace the existing and sick infrastructure by a more independent and decentralised effort.

(I had written something relatively similar in the pre-Web-2.0 era as part of my "Usability of the Perl World for Newcomers Essay". Nevertheless perlbuzz.com deserves credit for presenting it better, making it public knowledge, and making it more obvious.)

But the situation is now getting better. There are more independent developers who have started to set up sites and help resources of their own. More people blog about their Perl experiences. I'm also going to continue giving my share of the contribution by setting up Perl-Speak (Please don't register yet - the E-mail does not work yet due to problems with my hosting), by contributing to the FAQs, documentation and wikis, and by helping with coding. People like me would also like to complement the inadequate, "official", and completely non-open *.perl.org infrastructure, which has been suffering from bitrot and neglect.

Lately, I've had the pleasure of talking to many people on IRC who have decided to learn Perl for various reasons, and some of them are young or even underage. Along with CPAN and perl5, Perl offers some clear advantages that no language has.

Again, Perl is also not about hype. Some people have privately raved about Perl and recommended it to their friends, but otherwise Perl was promoted quietly, bottom-up and mostly by word-of-mouth. It's hard to know if Perl will become the "hottest" language again. But I believe it will still become more popular, even among new programmers.

Dave Neary: Malt Appreciation Society

Dave Neary — Sat, 05 Jul 2008 21:16:28 +0000

So when’s the Malt Appreciation Society meeting this year? I have a bottle of cask strength 12yo Glengoyne I picked up today & was planning to bring along - no idea if it’s any good. So… when do I get to find out???

Also, anyone interested in going for an early morning run (not the day after the Malt Appreciation Society meeting) drop me a line, especially if you’re in or near the Golden Horn Sirkeci… we can do some early morning tourism at about 12km/h.

Akkana Peck: Learning about Firefox 3 extensions

Sat, 05 Jul 2008 03:30:11 +0000

Oops! Right after I posted that last entry, I discovered that my little kitfox extension wasn't working as well as I'd thought. And the more I hacked it, the less well it worked, and the more I discovered was missing, like a chrome.manifest file (which firefox 2 hadn't seemed to need).

Eventually some very helpful folks on #extdev pointed me to Ted Mielczarek's excellent Extension Wizard. Give it some details about your extension (its name and version, your name, and a couple things you might want like a toolbar button, a prefs panel and a context menu) and it generates a zipped directory containing a bare bones extension, even including niceties like internationalized strings.

Even better, your new extension skeleton includes a readme that tells you how to leave the extension expanded while you work on it. That's quite a bit easier than building the XPI file and installing it each time.

So kitfox has a 0.3 version (in the unlikely event that anybody besides me wants it).

There's a project called fizzypop to develop and extend useful Mozilla dev tools like the Extension Wizard ... watch that space for more details.

Akkana Peck: Making Firefox 3 livable

Fri, 04 Jul 2008 18:00:23 +0000

I finally broke down and spent the time to get Firefox 3 working properly for me ... meaning, mostly, finding replacement extensions for the bare minimum of what I need in a browser: control over cookies (specifically, enabling/disabling them for specific sites), flashblock, and blocking of animated images. I'd downloaded extensions for all those a few weeks ago, but I found that although Firefox 3.0 said the FF3 extensions were active, and Firefox 2 said the old ones were, neither set actually worked.

I decided to start from scratch: remove all extensions -- rm -rf .mozilla/firefox/extensions/* .mozilla/firefox/extensions.* plus apt-get remove firefox-2-dom-inspector -- then install a new set of Firefox 3 add-ons.

After much hunting (I sure wish addons.mozilla.org would offer a way to limit the view to only extensions that work with Firefox 3! Combing through 15 pages of extensions looking for the handful that will actually install gets old fast) I found the replacements I needed: CS Lite for the cookie controls, a newer Flashblock, and Custom Toolbar Buttons as a stopgap for image animation (though I suspect updating anidisable will be a better solution in the long run). This time, with the old firefox 2 extensions purged, the new ones took hold and worked.

I also added a nice extension called OpenBook that fixes the horrible Firefox "Add bookmark" dialog. You know: the one that has two nearly identical dropdown category menus side by side, with the bigger one giving you only a tiny subset of your bookmark categories, and the smaller one being the real one. The one that doesn't offer a space for keyword, so to set up a bookmarklet you have to Add Bookmark, OK, Organize Bookmarks, find the bookmark you just added, Ctrl-I to get the Bookmark info dialog, and finally you can add your keyword. OpenBook gives you a dialog where you can set the keyword to begin with, and it only gives you one menu to list categories so you aren't constantly tempted to click on the wrong one.

Now for the urlbar -- that new firefox 3 "smarter" urlbar that slows down typing in the middle of a word so it can pop up a big fancy window full of guesses (all wrong) about where I might be trying to go. Actually, even if the guesses were right, it wouldn't help, because I'd have to stop typing, search the list visually, then if one of the suggestions was right, move my hand to the mouse or the arrow keys to choose that suggestion. That takes way longer than just typing the url.

But I guess I don't mind unhelpful suggestions popping up as long as it doesn't mess up focus (preventing me from clicking or tabbing to other apps on my screen) or slow down typing. Firefox 3 seems to be handling the focus issue better than firefox 2 did, but the slowdown was quite noticeable on the poor old laptop. So I wanted a way to disable the behavior. A little googling revealed that the Firefox crew immodestly calls their new urlbar the "awesomebar", which aside from giggle factor also proves quite useful in googling: a search on firefox disable awesomebar reveals that I'm not the only one who doesn't like it, and got me several preferences I could tweak in about:config plus a couple of extensions to turn it off entirely. I won't try to summarize, since the best settings depend on your machine's spec, plus personal preference.

Making progress! Now the only issue was getting my urlbar tweaks working, so that typing <Ctrl-Return> after typing a URL opened the URL in a new tab instead of tacking on various silly extensions (oh, yes, of course I wanted to go to http://www.firefox disable awesomebar.com rather than googling for those terms in a new tab). Fortunately, it turned out that the javascript that runs the urlbar has changed very little since firefox 2, and I hardly needed to change anything to get my kitfox extension (v. 0.2) working in Firefox 3.

Only one more issue: this blog. The CSS that handles the right sidebar wasn't displaying right. Seems that Firefox 2 has changed something about its interpretation of CSS, so it was floating the right sidebar way down to the bottom of the page below the last content line. Eventually (after adding firefox-3.0-dom-inspector, another extension that had stopped working in the transition) I discovered the problem: the #content was set to width: 77% while the #rightsidebar's left-margin was at 76%. Apparently Firefox 2 rounded up as needed, whereas Firefox 3 just ignores the left-margin if it would overlap the content, and then floats the sidebar anywhere it thinks it can fit it. Fixing those percentages helped quite a bit, and I added an overflow-x: hidden (on a tip from a helpful person in #firefox) so that wide calendar doesn't hurt layout for narrow windows. I think it's working now ... any readers having problems with the layout in any browser, by all means let me know.

Dave Neary: Ooopsie!

Dave Neary — Fri, 04 Jul 2008 14:14:44 +0000

I rebooted my computer and went out for lunch with some friends. When I came back, it was particularly unresponsive, so I went hunting, and top showed me this:

19055 root      20   0 1343m 453m 1524 D  0.3 45.3   1:46.13 rsvg-convert

A quick ps…

dneary@sligo:~$ ps -ef | grep 19055
root     19055 19054  0 12:25 ?        00:01:45
  /usr/bin/rsvg-convert -o /var/log/bootchart/hardy-20080704-1.png
  /var/log/bootchart/bootchart.svgz

Ouch!

Does bootchart run until you log in? Is this normal behaviour? 1.3G of virtual memory is an awful lot…

Dave Neary: dpkg-reconfigure xserver-xorg

Dave Neary — Fri, 04 Jul 2008 09:11:07 +0000

For anyone who has experienced pain when upgrading to a more recent version of Ubuntu with X and xrandr on Intel hardware, consider running this fabulous command.

This goes in particular for anyone who needed i915resolution before for wide-screens, and had a “ForceBIOS” option in xorg.conf. The driver to use for the hardware changed, and the xorg.conf got about 100 times smaller since Ubuntu 6.06 or 7.04.

This is the major weakness in the Ubuntu upgrade process, really… if hacks are needed to work around falings in previous versions, those hacks are (silently, IIRC) kept after an upgrade, even though they’re no longer necessary (and are, in fact, harmful).

Many thanks once again to Claude Paroz, wo helped me work through the projector problem & got me moving towards the fix.

Dave Neary: Live from RMLL

Dave Neary — Thu, 03 Jul 2008 12:52:29 +0000

I’m coming to the end of my two days in Mont de Marsan (and, as it happens, to the end of the charge in my laptop battery). I think the GNOME Accessibility presentation I gave went very well, certainly people seemed to get a lot from it. I’ll put my slides online at some stage (before the weekend), and I was filmed, when I have a link to the video I’ll throw that up too.

As usual, the great thing about conferences is meeting old friends, and making new ones, and there are a lot of familiar faces around.

One thing that did come out of my presentation is the need for those storyboards I proposed a while back. In particular, I tripped up when demoing Orca (no real plan to show off its functionality, other than turning on TTS, and “doing stuff”, then turning on magnification, and “doing stuff”, etc…), Dasher (it’d be handy to have a few phrases to type rather than coming up with something on the spot), and sticky & slow keys.

I hit a few problems with the keyboard a11y. When I had both sticky & slow keys activated, I got double letters (I’m sure it was a configuration issue, but anyway…). And when I used the keyboard shortcut to navigate to the top bar, I hit two bugs - if I open a menu in the top menubar, I can’t navigate away with the keyboard (Ctrl-Alt-Tab doesn’t work any more), and I can’t navigate to the notification area with the keyboard. And I got some comments on MouseTweaks (”we need a way to temporarily disable it for times when you’re reading a document or a web page, for example”) and Dasher (”not really suitable for certain classes of users” - I’ll try to get more information).

Yesterday’s presentation “Building bridges” went less well - it was a dry run for my GUADEC presentation, and I’ve taken away 3 or 4 good ideas for improvements. But like all the English presentations here, attendance was poor - I have about 10 or 12 attendees. And at 9am this morning, there was one person who turned up for my presentation in English on accessibility in GNOME - lucky enough, since when I tested my laptop with the projector, I had a bunch of problems! Many thanks to Claude Paroz, who helped me identify the problem (old driver + options which were necessary in Ubuntu 6.06 and 7.04, but have since been deprecated) and the solution (dpkg-reconfigure xserver-xorg). My laptop works with projectors! Yay!

Akkana Peck: Not a combination I'd think of

Thu, 03 Jul 2008 06:00:17 +0000

There's a store down the road from me that offers an unusual combination of items. It always makes me stop and wonder when I pass by.

It must be my naivety and lack of marketing accumen, but it never would have occurred to me that cigarettes and pure water were two products that ought to be sold side by side.

The most amazing part is that another store just a few blocks away has started offering the same combination! (Though their sign is much less striking.)

Akkana Peck: Nature updates

Thu, 03 Jul 2008 06:00:17 +0000

Part of my reason for keeping this blog is keeping records of when particular events happen. If there's no story attached, that doesn't necessarily make for interesting reading. So I'll be brief, and just mention that last weekend the mysterious chlorine smell (Dave calls it a bleach smell) was fairly strong up on Skyline near Castle Rock; but it was not noticable at all the previous super-hot week. There goes the theory that it's temperature related.

And the bullfrogs are back at Walden West pond, though they're not croaking very actively. We even managed to spot a (huge!) tadpole, and the feet of something that looked like a crab but was probably a crayfish.