> > I'm less keen on this idea - I think maybe some old version of libpng > > might not provide png_get_valid, but I think maybe all have > > png_read_info, so png_read_info is better for testing the lib is > > available...? Yes, I think so too, at least that was why I choosed this new one and did not pasted the old one (png_set_tRNS_to_alpha). Just look cleaner and simpler to figure out to me.
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