Squeak-dev December 2000

squeak-dev@lists.squeakfoundation.org

96 participants
272 discussions

IRC channel on OpenProjects.net
by Brian Rice 05 Dec '00

05 Dec '00

Hey all, I don't post much because my interest is mostly research as far as Squeak is concerned, but I've been following for at least a year, and have learned quite a bit about the system in that time. This is my way of giving back for now: I'm hosting a channel for new squeakers and gurus, mostly as a fallback when Nebraska isn't working right, or just to set things up for it without having to personally know a guru. Also it helps for low-bandwidth connections. The server is irc.openprojects.net, and I will be personally available most evenings from 6PM to 11PM, PST, on weekdays and most of the day on weekends. There's also a channel logger, which may prove useful at some point, but for now it's there just in case we need it. I don't want it to detract from the mailing list, though. This place is a great forum for just discussing issues and when newbies bring up issues, it's often important that the gurus notice the problems. Any comments are welcome. Thanks, ~

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UDP sockets???
by jchludzinski＠worldkey.net 05 Dec '00

05 Dec '00

Does #waitForDataUntil: applies to UDP sockets? I'm having a hard time telling which methods apply to UDP sockets, TCP sockets, or both. I'm trying to confine myself to the methods in the category "datagrams". But the examples (in the class methods) don't seem to bother (using methods in "datagram"). Why? ---John

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PDA Squeak, questions...
by Kevin Fisher 05 Dec '00

05 Dec '00

Hi! Well I gave in to the pre-xmas urge to spend (on myself :) and ordered an iPaq. I plan on experimenting heavily with it (probably using one of the micro-Linux ports, and Squeak). My Question: As far as PDA's go, what kind of displays does Squeak currently run on? Has anyone tried it with nano-X? Are there any ports (or plans to port) Squeak to embedded-Qt (no Xserver required)? (http://www.trolltech.com/company/announce/embeddeddl.html for details, http://www.trolltech.com/products/qt/embedded/qpe.html to see an application of Qt/E in action :) I guess somewhat related...is there a port of Squeak that runs on the raw display device (no Xwindows) under Linux (ie SVGAlib, GGI or fbdev)? Thanks.

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Re: [BUG?]New Event Architecture Queue Sequencing?
by Bob Arning 05 Dec '00

05 Dec '00

On Mon, 4 Dec 2000 15:12:09 -0800 John M McIntosh <johnmci(a)smalltalkconsulting.com> wrote: >Try the latest 2.9.6 VM There was some changes to the logic with >regard to duplicate idle events, but I'm not sure this will clean up >the problem. Bob did have his fingers in the event logic with a >change to improve performance by stealing time from background >applications, but I think that feature isn't turned on by default? It is off by default. In unsuccessfully trying to duplicate Andrew's problem, I tried it both ways and saw no change. Cheers, Bob

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Re: [BUG?]New Event Architecture Queue Sequencing?
by Andrew C. Greenberg 05 Dec '00

05 Dec '00

At 2:18 PM +0100 12/4/00, Hans-Martin Mosner wrote: >"Andrew C. Greenberg" wrote: > >> Sorry, my retraction of the bug report appears premature. It repeats >> with regularity now on my iMac, with current changesets and the B5 >> MacOS VM. The problem, as mentioned, is that events, after a bunch >> have backed up, tend to fire off at the rate of about 1 per second, >> which can only be heightened by, for example, pressing the shift key, >> or the like. > >Andrew, >could it be that you're using a PowerBook? Squeak does not interact with >the Power Manager, so the processor slows down when it thinks that you >don't do anything. I've also noticed this with every version of Squeak but >did not have the time to look into the matter. >Having some strategy for dealing with power management would certainly be >great especially for the PDA Squeak ports... I was, in fact, testing with one of the new Firewire iBooks. It is interesting that the "slow event" firings can be sped up simply by pressing the shift key a few times, and slows back down when you stop. There are no serious delays in real time, however, almost as soon as you stop typing, the delay kicks in.

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Re: Looking for help with BitBlit and BMP files...
by Tim Olson 04 Dec '00

04 Dec '00

>My problem is if leftEyeImage and rightEyeImage was saved as a BMP file >from Photoshop4 then I get "blank holes (white)" in my final anaglyphImage >where pure black should be. > >If leftEyeImage and rightEyeImage was saved as a jpg file then everything >seems as expected (black is black). > >Do you think this would be from: > >1) my BitBlit code below >2) Squeaks BMP vrs JPEG reading code >3) Photoshop4 Probably 2): >From the comment in Color >> PixelValueForDepth: "Details: For depths of 8 or less, the result is a colorMap index. For depths of 16 and 32, it is a direct color value with 5 or 8 bits per color component." "Transparency: The pixel value zero is reserved for transparent. For depths greater than 8, black maps to the darkest possible blue." So Squeak reserves the pixel bit pattern of all zeros for transparent. Any code in Squeak that directly generates bitmaps from external sources should take this into account and substitute the bit pattern ..0001 for any pure black color. The code in the JPEG reader handles this during color conversion and clipping, but perhaps the BMP reader (I don't seem to have this in my image) doesn't do this. -- tim

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Looking for help with BitBlit and BMP files...
by ret＠deltanet.com 04 Dec '00

04 Dec '00

Hello, I am playing with some stereo photo 3-D in Squeak... Time to get out those goofey red and blue glasses;-) I have run across something that seems a bit odd to me, maybe someone could point out what I my be missing here... My problem is if leftEyeImage and rightEyeImage was saved as a BMP file from Photoshop4 then I get "blank holes (white)" in my final anaglyphImage where pure black should be. If leftEyeImage and rightEyeImage was saved as a jpg file then everything seems as expected (black is black). Do you think this would be from: 1) my BitBlit code below 2) Squeaks BMP vrs JPEG reading code 3) Photoshop4 leftEyeImage is a Form of depth 32 rightEyeImage is a Form of depth 32 rgbADD is 20 rgbSUB is 21 code snip... anaglyphImage _ rightEyeImage deepCopy. "Remove the red channel from the right eye image..." (BitBlt destForm: anaglyphImage sourceForm: rightEyeImage fillColor: Color red combinationRule: self rgbSUB destOrigin: 0 @ 0 sourceOrigin: 0 @ 0 extent: rightEyeImage extent clipRect: rightEyeImage boundingBox) copyBits. "Now add the red channel from the left eye image..." (BitBlt destForm: anaglyphImage sourceForm: leftEyeImage fillColor: Color red combinationRule: self rgbADD destOrigin: 0 @ 0 sourceOrigin: 0 @ 0 extent: leftEyeImage extent clipRect: leftEyeImage boundingBox) copyBits Any other Ideas? Or a faster way to do this? Cordially, -Rick- PS - Anyone up for adding an anaglyph camera to Wonderland? Or how about an Interlaced camera? PS - Is anyone out there doing a "blue screen" compositor in Squeak? "All you've got to do is own up to your ignorance honestly, and you'll find people who are eager to fill your head with information." - Walt Disney -

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RE: QKS and .NET (was: RE: Pentium 4 tinyBenchmark results)
by George Bosworth 04 Dec '00

04 Dec '00

>Isn't the .NET technology based on QKS' Smalltalk Agents? no. QKS was one of a number of companies and institutions that ported their stuff on top of an early pre-beta version of .NET -----Original Message----- From: Jeff Szuhay [mailto:jeff@szuhay.org] Sent: Monday, December 04, 2000 10:53 AM To: Squeak Public Maliing List Subject: QKS and .NET (was: RE: Pentium 4 tinyBenchmark results) >P.S. Just got the betas of Micro$oft's Visual Studio.NET. >Give me Smalltalk over C# any day! Isn't the .NET technology based on QKS' Smalltalk Agents? imagine the "innovation"... taking a now 20 year old technology and basing a product strategy on it? BTW, I was reminded this weekend of the value of longevity of certain technologies, in this case film. The remark was that any 100 year old negative could be used to make a picture. Can we say that about computer media? -- ************************************************** Jeff Szuhay A randomly-directed www.szuhay.org chaotical wetware pattern jeff(a)szuhay.org recognizer/generator. Make things as simple as possible, but not simpler. -- Albert Einstein

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Q: Process priority and some other stuff ?
by Karl Ramberg 04 Dec '00

04 Dec '00

Hi, I'm hacking on the MPEGPlayer and the _big_ issue is speed. I have three processes that handles audio and video. The first audio process is feeding a buffer and spend most it's time in wait (3000 milliseconds). The second audio process is SoundPlayer. And the video process is reading into a form and synching to real-time. My questions are 1 How do I let the system know that a process have some cycles to spear ? 2 The SoundPlayer process runs at userInterruptPriority (5) Is there anything to gain by increasing this to priority 6 or 7 ? Is there anything for the video process to gain from running at 6 or 7 ? ( Latest released MPEGPlayer code runs at priority 4) 3 I'm trying to understand semaphores. Are there any Cliff's Notes on semaphores out there ? If not, have I understood correctly if I think of semaphores as a flag to start/resume another process that is idle ? Thanks for the patients, Karl

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QKS and .NET (was: RE: Pentium 4 tinyBenchmark results)
by Jeff Szuhay 04 Dec '00

04 Dec '00

>P.S. Just got the betas of Micro$oft's Visual Studio.NET. >Give me Smalltalk over C# any day! Isn't the .NET technology based on QKS' Smalltalk Agents? imagine the "innovation"... taking a now 20 year old technology and basing a product strategy on it? BTW, I was reminded this weekend of the value of longevity of certain technologies, in this case film. The remark was that any 100 year old negative could be used to make a picture. Can we say that about computer media? -- ************************************************** Jeff Szuhay A randomly-directed www.szuhay.org chaotical wetware pattern jeff(a)szuhay.org recognizer/generator. Make things as simple as possible, but not simpler. -- Albert Einstein

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