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how to compare two bitmaps for equality fast?

Posted on 2009-05-19
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Hi, I have two bitmaps both 19px wide and 54px high..Just want to know if they are the same visually or not..I am currently using scanline looping through both bitmaps till i find different pixels or else they are the same..but i read somewher that this approach is slow relative to what is possible..How can I use GetDIbits for this purpose?
thanks
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Question by:Alavna
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irishbuddha earned 1500 total points
ID: 24424277
From EFGs Reference Library: http://www.efg2.com

http://www.efg2.com/Lab/Library/UseNet/2002/0114.txt
"Andrew Rybenkov's UseNet Post       about using GetDIBits/SetDIBits as an alternative to Scanline"

You end up using a PColorArray as seen in the example (array of TColorRec, describing each pixel).

Given the types defined there, and using that sample, you can then compare the arrays "pixel by pixel" via the TColorRec byte properties for equaltiy, bailing on your first inequality.

Don't have any personal code, but this has been a great reference site for me in the past and the code is pretty lean.


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