png_do_read_swap_alpha 1853 third_party/libpng/pngrtran.c png_do_read_swap_alpha(png_row_infop row_info, png_bytep row)
png_do_read_swap_alpha  188 third_party/libpng/pngusr.h #define png_do_read_swap_alpha          wk_png_do_read_swap_alpha