can't reuse a pure c++ .h file's methods and classes

[marcel]

You should stick to RGB32.
The problem is in line 31 of the code you posted:

pixel = rgbImage(x,y);

pixel = rgbImage(x,y);

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As before, you can't assign that directly.
First convert it to qRgb, using qRed, etc...
It is the reverse transformation of what you did before.

EDIT: Actually, I think it is better to use the macros from your header to extract the components and build a qRgb:

#define RED(pixel) ((pixel) & 0xff)
#define GREEN(pixel) (((pixel)>>8) & 0xff)
#define BLUE(pixel) (((pixel)>>16) & 0xff)

#define RED(pixel) ((pixel) & 0xff)
#define GREEN(pixel) (((pixel)>>8) & 0xff)
#define BLUE(pixel) (((pixel)>>16) & 0xff)

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Regards