C to Pascal conversion hq2x

[jdarling]

Updated the download link above with Setharian's version. I did make one minor change from longword to hq2xnumber this way in 64 bit compilers it should be easy to find the right type when someone decides to change it.

I've also started to convert the cimage unit, as it seems that RGB won't work due to the internal pixel format . The converted cimage.pas file doesn't work properly right now. There are problems with the convert16 and convert24 methods. Basically I ran the C source through a converter and then cleaned it up until it compiled. Looking at the output of the images after convert16 is called it appears that I have my pointers jacked up again , the colors are quite off but the pattern is correct.

Thanks everyone for the help so far, hopefully soon we will have a pure pascal version of hq2x. When this is complete I think working on 2xSAI would make sense. Any interest on converting this one as well?

[savage]

So any screenies from this project yet?

[jdarling]

Not yet, I'm still working on getting cimage working in its converted state. The hq2x download listed above, or in my zip file, seems to do exactly what its supposed to but needs a 16bit surface to work against. So until I get cimage converted I think it is almost useless as I can't find any image component for Lazarus that uses 16bit.

I will say that you get some pretty cool and interesting results pushing a Laz RGB image into the routine though

[jdarling]

Ok, well sorta... Using the Vampyre Imaging Library I am able to prove that the conversion of hq2x works perfectly! It loads, scales, and saves out an image just fine.

This brings in an interesting problem though. I can load the resulting image in anything except for a Lazarus TImage. Oh well, loading with paint and then resaving works just fine. I wonder if I used Vampyre to save it to a more compatible format if it would work ok.

Anyways, the download link above has the updated code that works fine.

Here are the two samples, input and output, sorry for the bitmap posting but thats the format hq2x plays in and I don't want to show 3rd party conversions.



Just in case, here is the download link (same as above) again:
http://www.eonclash.com/PGD/hq2x.zip

[savage]

Looks good. Did it take you long to find the last few pointer issues?
How quick is it compared to other scalers?

[jdarling]

Looks good. Did it take you long to find the last few pointer issues?
How quick is it compared to other scalers?

I still haven't managed to fix cimage, but when Vampyre worked I stopped looking .

As for speed, I don't know haven't actually benchmarked many 2x scalers in my life. On my system it performs a scale of a 256x256 image easily at 60fps real time.

[WILL]

If it performs well in window mode, I might just have to take advantage of it for my final version of S33.

Nice work Jeremy.

[Galfar]

This brings in an interesting problem though. I can load the resulting image in anything except for a Lazarus TImage. Oh well, loading with paint and then resaving works just fine. I wonder if I used Vampyre to save it to a more compatible format if it would work ok.

I noticed that too. Lazarus' bitmap loader for some reason only loads bottom-up and not top-down bitmaps (which Imaging creates). I'll probably change bitmap saver in Imaging to save bitmaps as bottom-up instead (these should work everywhere).

[savage]

Jeremy, are there any plans to write an SDL compatible implementation by any chance ?

[jdarling]

Well, Galfar actually fixed my original translation so I'll have to get to where I understand his changes. But, yes, I plan on building out a version that works with SDL images eventually.