How can I (as fast as possible) determine if two bitmaps are the same, by value, and not by reference? Is there any fast way of doing it?
What if the comparison doesn’t need to be very precise?
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How can I (as fast as possible) determine if two bitmaps are the same, by value, and not by reference? Is there any fast way of doing it?
What if the comparison doesn’t need to be very precise?
you can check the dimensions first – and abort the comparison if they differ.
For the comparison itself you can use a variaty of ways:
very fast but possibly wrong… can be used as a first check, if it differs they are dfferent… otherwise further checking needed
not so fast but rather precise
XOR the image content… abort when the first difference comes up…