png_set_shift    1766 third_party/libpng/png.h extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr,
png_set_shift    1446 third_party/libpng/pngread.c       png_set_shift(png_ptr, sig_bit);
png_set_shift    1533 third_party/libpng/pngwrite.c       png_set_shift(png_ptr, &info_ptr->sig_bit);