#3 Improve "const correctness"

[Markus Elfring]

Would you like to apply the advices from the article
"http://en.wikipedia.org/wiki/Const_correctness" to
your sources?
I suggest to add the key word "const" to the type
specifiers for parameters like the following examples.

http://cvs.sourceforge.net/viewcvs.py/cpcd/cpcd/src/cpcd.h?rev=1.3&view=markup
src, w, h (function "ImageConverter")
src , src_w, src_h, src_pitch, dest_w, dest_h,
dest_pitch (function "image_stretch")

[Markus Elfring]

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Sorry - I'd like to refer to this:
http://cvs.sourceforge.net/viewcvs.py/effectv/EffecTV-newapi/src/image.h?rev=1.7&view=markup