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由 Glenn Randers-Pehrson 提交于
in pngpriv.h in case the user forgot to define them in their pngusr.h. This means it is safe for people not building a DLL to omit these defines from pngusr.h.
4f108d8a
in pngpriv.h in case the user forgot to define them in their pngusr.h. This means it is safe for people not building a DLL to omit these defines from pngusr.h.