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How should such declaration be converted to delphi?
void method (void *pixels);
And I have also the information that I should pre-allocate that variable.
could someone give me a hint?
If you need to stick to the original declaration format (as for example when converting C DLL headers), and the conversion would be:
You can find dome more information on converting C headers to Delphi here
On the other hand, if you are converting the whole method or class you might want to adapt it to a more Delphi-like code. I do not know what “pixels” is, so I can hardly guess which would be the best option.
On a wild guess, if it is a matrix with some information about each pixel (position, color, alpha channel?) you can easily handle such a structure like that with object lists or create your own class to handle it.
HTH