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I have made my parallel resampling of bitmaps now as fast as I can get it. Now I would find it interesting to know, how the algorithm performs on other systems, and it would be super to get suggestions for improvement. The procedures can be found in the unit uScale under Algorithms in the attached zip. I have tested against Windows StretchBlt-Half_Tone, WICImage and Graphics32. On my PC (AMD Ryzen 7 1700, 8-core) I see a substantial improvement in speed. The threads are based on TThread rather than TTask or TParallel, because I had failures using the latter two, whereas the oldfashioned threads haven't failed me ever in gazillions of runs. If you want to compile and run the comparison project, you need to include the source folder of Graphics32 (latest version) in your search path. For convenience it is included in the zip under Algorithms. I couldn't find a way to divvy out only the units needed for resampling. The test against Graphics32 might be slightly unfair, because of bitmaps being assigned to TBitmap32 before the processing. Right now, the procedure itself cannot be run in concurrent threads, because the array of TThreads is a global variable, I need to change the design (ideas welcome). There might be still room for improvement by minimizing the cache misses, but my head can't handle it at the moment. Hope you find it useful. Renate Bitmap Scaling.zip

You may remember that I was forced to reduce GExperts support for Delphi 6 a while ago, because the IDE no longer started on my computer. It turns out that it was a GExperts bug after all. The fix was simple once I knew what the problem was. And I only found out because carrchri, one of the few GExperts for Delphi 6 users, debugged it and told me. Thanks a lot! When I was able to use the Delphi 6 IDE again I also fixed incompatibilities in the DFMs that prevented some of the dialogs open in Delphi 6. So here is a new release. Apart from these two Delphi 6 related bug fixes there are some improvements ... read on in the blog post.