The libwebp package contains a library and support programs to encode and decode images in WebP format.
libwebp：http://www.linuxfromscratch.org/blfs/view/systemd/general/libwebp.html
- cwebp: compresses an image using the WebP format.
- dwebp: decompresses WebP files into PNG, PAM, PPM or PGM images.
- gif2webp: converts a GIF image to a WebP image.
- vwebp: decompress a WebP file and display it in a window.
