Size statictics of WebP on the different levels.

webpStatistics.d

#!/usr/bin/env dub
/+ dub.json:
{
    "name": "lalala",
    "authors": [
        "Георгий Устинов"
    ],
    "license": "Unlicense",
    "dependencies": {
        "dlib-webp": "~>0.0.6",
        "emsi_containers": "~>0.5.2"
    }
}
+/

// Usage:
//   dub build --single lalala.d 
//   ./lalala > sizes.csv

import dlib.image;
import dlibwebp;
import containers.treemap;
import std.file;
import std.stdio : writeln, write, writef, stderr;
import std.conv;
import std.path;

const string[] directories = [
    "3kImages_webp_q0/",
    "3kImages_webp_q24/",
    "3kImages_webp_q65/",
    "3kImages_webp_q85/",
    "3kImages_webp_q95/",
    "3kImages_webp_lossless/"
];

void main() {
    
    TreeMap!(string, ulong[]) result;
    
    for (int i = 0; i < directories.length; i++) {
        auto files = dirEntries(directories[i],"*.webp", SpanMode.shallow);
        foreach (file; files) {
            string resultKey = baseName(file.name);
            if (!result.containsKey(resultKey)) {
                auto row = new ulong[directories.length + 1];
                // I know, there is a much faster way to do this, but it's too late. I mean, it's night.
                SuperImage image = loadWEBP(file.name);
                row[0] = image.width * image.height;
                result[resultKey] = row;
            }
            auto row = result[resultKey];
            row[i + 1] = file.size;
            result.remove(resultKey);
            result[resultKey] = row;
            stderr.writef("%s completed\n", resultKey);
        }
    }
    
    foreach (k; result.keys()) {
        write(k, ";");
        foreach (number; result[k]) {
            write(number, ";");
        }
        writeln();
    }
}