Hi, I implemented the pdiff [1] algorithm in PHP, just converted the cpp code to PHP, and it is far to slow, to even think of possible optimizations (and I don't see any real optimizations). It takes about 1m and 30s to compare a single small image on my machine. This would be a major slow down of our test cases, as I currently compare about 75 bitmaps in my tests (would result in a 2h run, without code coverage ;).
So what are the options? 1) pdiff now compiles without patching and can compare PNGs with one patch [2] in no time. Is it an option to wait for the patch beeing included and make it an requirement for testing the bitmap stuff? 2) We could convert the cpp code to c and make a pecl extension out of it. This would be far easier to install, on not a really big issue. 3) Evaluate other algorithms / alternatives. The pdiff algorithm works really well (and it is beautiful, look at the code :), and I personally ran out of options. 4) Stay with imagemagick compare, and increase the expected maximum noise distance, but I think we are already beyond any proper testing with the current maximum noise distances. [1] http://sourceforge.net/projects/pdiff [2] http://sourceforge.net/tracker/index.php?func=detail&aid=1748226&group_id=166838&atid=840552 I attached my (not completely working) PHP implementation, if you want to test it yourself, or take a more detailed look at the code. It still has some bug, but fixing this wouldn't solve the performance problem. -- Mit freundlichen Grüßen / Med vennlig hilsen Kore Nordmann (GPG: 0xDDC70BBB) eZ Components Developer eZ systems Headquaters tel +49 (0) 231-9742-7750 | fax +49 (0) 231-9742-7751 [EMAIL PROTECTED] | eZ systems | ez.no
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