/*
#
# File : captcha.cpp
# ( C++ source file )
#
# Description : Captcha images generator.
# This file is a part of the CImg Library project.
# ( http://cimg.sourceforge.net )
#
# Copyright : David Tschumperle
# ( http://tschumperle.users.greyc.fr/ )
#
# License : CeCILL v2.0
# ( http://www.cecill.info/licences/Licence_CeCILL_V2-en.html )
#
# This software is governed by the CeCILL license under French law and
# abiding by the rules of distribution of free software. You can use,
# modify and/ or redistribute the software under the terms of the CeCILL
# license as circulated by CEA, CNRS and INRIA at the following URL
# "http://www.cecill.info".
#
# As a counterpart to the access to the source code and rights to copy,
# modify and redistribute granted by the license, users are provided only
# with a limited warranty and the software's author, the holder of the
# economic rights, and the successive licensors have only limited
# liability.
#
# In this respect, the user's attention is drawn to the risks associated
# with loading, using, modifying and/or developing or reproducing the
# software by the user in light of its specific status of free software,
# that may mean that it is complicated to manipulate, and that also
# therefore means that it is reserved for developers and experienced
# professionals having in-depth computer knowledge. Users are therefore
# encouraged to load and test the software's suitability as regards their
# requirements in conditions enabling the security of their systems and/or
# data to be ensured and, more generally, to use and operate it in the
# same conditions as regards security.
#
# The fact that you are presently reading this means that you have had
# knowledge of the CeCILL license and that you accept its terms.
#
*/
#ifndef cimg_debug
#define cimg_debug 1
#endif
#include "CImg.h"
using namespace cimg_library;
#undef min
#undef max
// Main procedure
//----------------
int main(int argc,char **argv) {
// Read command line parameters
//------------------------------
cimg_usage("Simple captcha generator.");
const char *file_o = cimg_option("-o",(const char*)0,"Output image file");
const bool add_border = cimg_option("-b",true,"Add border to captcha image");
const bool visu = cimg_option("-visu",true,"Enable visualization if no output file");
// Generate captcha text (6 char max).
//------------------------------------
const char *predef_words[] = {
"aarrgh", "abacas", "abacus", "abakas", "abamps", "abased", "abaser", "abases", "abasia", "abated", "abater", "abates", "abatis", "abator",
"baobab", "barbal", "barbed", "barbel", "barber", "barbes", "barbet", "barbie", "barbut", "barcas", "barded", "bardes", "bardic", "barege",
"cavies", "cavils", "caving", "cavity", "cavort", "cawing", "cayman", "cayuse", "ceased", "ceases", "cebids", "ceboid", "cecity", "cedarn",
"dicast", "dicers", "dicier", "dicing", "dicker", "dickey", "dickie", "dicots", "dictum", "didact", "diddle", "diddly", "didies", "didoes",
"emails", "embalm", "embank", "embark", "embars", "embays", "embeds", "embers", "emblem", "embody", "emboli", "emboly", "embosk", "emboss",
"fluffy", "fluids", "fluish", "fluked", "flukes", "flukey", "flumed", "flumes", "flumps", "flunks", "flunky", "fluors", "flurry", "fluted",
"genome", "genoms", "genres", "genros", "gentes", "gentil", "gentle", "gently", "gentry", "geodes", "geodic", "geoids", "gerahs", "gerbil",
"hotter", "hottie", "houdah", "hounds", "houris", "hourly", "housed", "housel", "houser", "houses", "hovels", "hovers", "howdah", "howdie",
"inland", "inlays", "inlets", "inlier", "inmate", "inmesh", "inmost", "innage", "innate", "inners", "inning", "inpour", "inputs", "inroad",
"joypop", "jubbah", "jubhah", "jubile", "judder", "judged", "judger", "judges", "judoka", "jugate", "jugful", "jugged", "juggle", "jugula",
"knifer", "knifes", "knight", "knives", "knobby", "knocks", "knolls", "knolly", "knosps", "knotty", "knouts", "knower", "knowns", "knubby",
"legate", "legato", "legend", "legers", "legged", "leggin", "legion", "legist", "legits", "legman", "legmen", "legong", "legume", "lehuas",
"mammal", "mammas", "mammee", "mammer", "mammet", "mammey", "mammie", "mammon", "mamzer", "manage", "manana", "manats", "manche", "manege",
"nihils", "nilgai", "nilgau", "nilled", "nimble", "nimbly", "nimbus", "nimmed", "nimrod", "ninety", "ninjas", "ninons", "ninths", "niobic",
"offish", "offkey", "offset", "oftest", "ogdoad", "oghams", "ogival", "ogives", "oglers", "ogling", "ogress", "ogrish", "ogrism", "ohmage",
"papaws", "papaya", "papers", "papery", "pappus", "papula", "papule", "papyri", "parade", "paramo", "parang", "paraph", "parcel", "pardah",
"quasar", "quatre", "quaver", "qubits", "qubyte", "queans", "queasy", "queazy", "queens", "queers", "quelea", "quells", "quench", "querns",
"raised", "raiser", "raises", "raisin", "raitas", "rajahs", "rakees", "rakers", "raking", "rakish", "rallye", "ralphs", "ramada", "ramate",
"savory", "savour", "savoys", "sawers", "sawfly", "sawing", "sawlog", "sawney", "sawyer", "saxony", "sayeds", "sayers", "sayest", "sayids",
"tondos", "toneme", "toners", "tongas", "tonged", "tonger", "tongue", "tonics", "tonier", "toning", "tonish", "tonlet", "tonner", "tonnes",
"uredia", "uredos", "ureide", "uremia", "uremic", "ureter", "uretic", "urgent", "urgers", "urging", "urials", "urinal", "urines", "uropod",
"villus", "vimina", "vinals", "vincas", "vineal", "vinery", "vinier", "vinify", "vining", "vinous", "vinyls", "violas", "violet", "violin",
"webfed", "weblog", "wechts", "wedded", "wedder", "wedeln", "wedels", "wedged", "wedges", "wedgie", "weeded", "weeder", "weekly", "weened",
"xystoi", "xystos", "xystus", "yabber", "yabbie", "yachts", "yacked", "yaffed", "yagers", "yahoos", "yairds", "yakked", "yakker", "yakuza",
"zigged", "zigzag", "zillah", "zinced", "zincic", "zincky", "zinebs", "zinged", "zinger", "zinnia", "zipped", "zipper", "zirams", "zircon" };
cimg::srand();
const char *const captcha_text = predef_words[std::rand()%(sizeof(predef_words)/sizeof(char*))];
// Create captcha image
//----------------------
// Write colored and distorted text
CImg<unsigned char> captcha(256,64,1,3,0), color(3);
char letter[2] = { 0 };
for (unsigned int k = 0; k<6; ++k) {
CImg<unsigned char> tmp;
*letter = captcha_text[k];
if (*letter) {
cimg_forX(color,i) color[i] = (unsigned char)(128+(std::rand()%127));
tmp.draw_text((int)(2+8*cimg::rand()),
(int)(12*cimg::rand()),
letter,color.data(),0,1,std::rand()%2?38:57).resize(-100,-100,1,3);
const unsigned int dir = std::rand()%4, wph = tmp.width()+tmp.height();
cimg_forXYC(tmp,x,y,v) {
const int val = dir==0?x+y:(dir==1?x+tmp.height()-y:(dir==2?y+tmp.width()-x:tmp.width()-x+tmp.height()-y));
tmp(x,y,v) = (unsigned char)cimg::max(0.0f,cimg::min(255.0f,1.5f*tmp(x,y,v)*val/wph));
}
if (std::rand()%2) tmp = (tmp.get_dilate(3)-=tmp);
tmp.blur((float)cimg::rand()*0.8f).normalize(0,255);
const float sin_offset = (float)cimg::crand()*3, sin_freq = (float)cimg::crand()/7;
cimg_forYC(captcha,y,v) captcha.get_shared_row(y,0,v).shift((int)(4*std::cos(y*sin_freq+sin_offset)));
captcha.draw_image(6+40*k,tmp);
}
}
// Add geometric and random noise
CImg<unsigned char> copy = (+captcha).fill(0);
for (unsigned int l = 0; l<3; ++l) {
if (l) copy.blur(0.5f).normalize(0,148);
for (unsigned int k = 0; k<10; ++k) {
cimg_forX(color,i) color[i] = (unsigned char)(128 + cimg::rand()*127);
if (cimg::rand()<0.5f) copy.draw_circle((int)(cimg::rand()*captcha.width()),
(int)(cimg::rand()*captcha.height()),
(int)(cimg::rand()*30),
color.data(),0.6f,~0U);
else copy.draw_line((int)(cimg::rand()*captcha.width()),
(int)(cimg::rand()*captcha.height()),
(int)(cimg::rand()*captcha.width()),
(int)(cimg::rand()*captcha.height()),
color.data(),0.6f);
}
}
captcha|=copy;
captcha.noise(10,2);
if (add_border) captcha.draw_rectangle(0,0,captcha.width()-1,captcha.height()-1,CImg<unsigned char>::vector(255,255,255).data(),1.0f,~0U);
captcha = (+captcha).fill(255) - captcha;
// Write output image and captcha text
//-------------------------------------
std::printf("%s\n",captcha_text);
if (file_o) captcha.save(file_o);
else if (visu) {
CImgDisplay disp(CImg<unsigned char>(512,128,1,3,180).draw_image(128,32,captcha),captcha_text,0);
while (!disp.is_closed() && !disp.key()) { disp.wait(); if (disp.is_resized()) disp.resize(disp).wait(100); }
}
return 0;
}