png_text_compress  829 third_party/libpng/pngwutil.c       profile_len = png_text_compress(png_ptr, profile,
png_text_compress 1427 third_party/libpng/pngwutil.c    text_len = png_text_compress(png_ptr, text, text_len, compression,
png_text_compress 1492 third_party/libpng/pngwutil.c    text_len = png_text_compress(png_ptr, text, text_len, compression-2,