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Cross-platform BBC BASIC (Windows, Linux x86, Mac OS-X, Android, iOS, Raspberry Pi)
Re: Creating Bitmap
« Reply #8 on: Nov 1st, 2017, 12:42am »
Thanks Richard.
Up to now I have been using temp files and it has been working fine.
The person I am writing the application for was trying it out on various (old) hardware and had an issue with a certain low spec machine that was taking 1-2 seconds to save the temp file which made the program unusable.
I was just exploring an alternative approach to see if it made any difference, which it did in this case so now the person can continue to use the program on his preferred device.
I guess if I was really motivated I would just rewrite the whole thing in C and be done with it but part of fun was having a BBC Basic version of the program as that is where this whole project started.
It's been interesting to see how far we could take a basic program but really it's becoming more and more departed from what it was when it started a while back.
Thanks for the advice... if anyone interested feel free to have a look at the current code and offer any further tips.
a certain low spec machine that was taking 1-2 seconds to save the temp file
Taking 'seconds' is almost unbelievable. I've measured the time it takes to save a 640x512 window on my two slowest machines, an ancient Windows 95 (yes, really!) PC and the Raspberry Pi: they were 230 ms and 100 ms respectively. On the modern laptop I'm using to write this, it was 6 ms!
Quote:
I guess if I was really motivated I would just rewrite the whole thing in C and be done with it
Graphics operations are almost invariably dominated by the OS and the GPU, not by the programming language used. Writing it in C would probably make no discernable difference to the speed.
Re: Creating Bitmap
« Reply #10 on: Feb 18th, 2018, 08:55am »
One possible explanation might be if the computer in question is a laptop and turns the hard drive off after every access - I had one that did that. You had to wait for the drive to come up to speed before any read or write. Most frustrating!
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