c_gdk_pixbuf_save_to_buffer

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
int function(GdkPixbuf* pixbuf, char** buffer, size_t* bufferSize, const(char)* type, GError** error, ...) c_gdk_pixbuf_save_to_buffer;

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