// Takes a 3 character or 6 character hex color value
// and returns a pointer to an array of three RGB values.
// Assumes valid hex value.

int * hex2rgb(string hex) {
    int* rgb = new int[3];
    stringstream ss;
    string str;

    // Drop a hash if the value has one
    if (hex[0] == '#') {
        hex.erase(0,1);
    }

    int size = hex.size();

    for (int i = 0; i < 3; i++) {
        // Determine 3 or 6 character format.
        if (size == 3) { str = string(2, hex[i]); }
        else if (size == 6) { str = hex.substr(i * 2, 2); }
        else { break; }

        ss << std::hex << str;
        ss >> rgb[i];
        ss.clear();
    }

    return rgb;
}

Posted: March 20, 2023

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