On Sep 18, 2010, at 2:45 AM, Felipe Monteiro de Carvalho wrote:
I would do it like this:
1> Work with a bitmap canvas instead of the image canvas
2> Draw your image to the bitmap
3> Convert the bitmap to a TLazIntfImage
4> It should now be trivial to build an image inversion function, you
can just create a loop to read and change the pixels
5> Convert the TLazIntfImage back to the bitmap
6> Draw the bitmap in the image canvas
More info here:
http://wiki.lazarus.freepascal.org/Developing_with_Graphics#Working_with_TLazIntfImage
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Felipe Monteiro de Carvalho
Thanks for the tip, Felipe - I will give it a try over the weekend.
I'm a bit concerned about the looping, though, as this is a more or
less real time display of a waveform ... <sigh> ... lots of pixels...
Be well,
Dave H.
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