It would be exactly a quine, you'd just ram the generated source code through the image generation algorithm rather than printing to stdout. So yes, the existe

It would be exactly a quine, you'd just ram the generated source code through the image generation algorithm rather than printing to stdout. So yes, the existence of quines means that it must be possible. It'd probably be about twice as long, though, based on the typical shape of C/C++ quines.