png_do_write_swap_alpha 199 third_party/libpng/pngusr.h #define png_do_write_swap_alpha wk_png_do_write_swap_alpha png_do_write_swap_alpha 344 third_party/libpng/pngwtran.c png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)