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handling png_struct members rearranged - partly to reorder to avoid packing, partly to put frequently accessed members at the start and partly to make the grouping more clear. png_set_filter code has been rewritten and the code shared with png_write_start_row moved to a common function. Comments in png.h have been made more clear. Minor fixes to contrib/libtests/timepng.c and some of the png_*_tRNS logic, including more error detection in png_set_tRNS.