Squashed 'third_party/cimg/' content from commit 4b66369
Change-Id: I7454d9107a08dba899fd4659731733049165ae0a
git-subtree-dir: third_party/cimg
git-subtree-split: 4b66369ab4e34a46119d6c43e9adce061bb40f4b
diff --git a/examples/image2ascii.cpp b/examples/image2ascii.cpp
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+/*
+ #
+ # File : image2ascii.cpp
+ # ( C++ source file )
+ #
+ # Description : A basic image to ASCII-art converter.
+ # This file is a part of the CImg Library project.
+ # ( http://cimg.eu )
+ #
+ # 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.
+ #
+*/
+
+// Tell CImg not to use display capabilities.
+#undef cimg_display
+#define cimg_display 0
+#include "CImg.h"
+using namespace cimg_library;
+
+/*---------------------------
+
+ Main procedure
+
+ --------------------------*/
+int main(int argc,char **argv) {
+ cimg_usage("A simple image to ASCII-art converter.\n\nUsage : image2ascii [options] image");
+
+ // Read command line parameters
+ const char *const file_i = cimg_option("-i",(char*)0,"Input image");
+ const char *const geom = cimg_option("-g","79x40","Output size");
+ const int alphabet = cimg_option("-a",0,"Alphabet type (0=full, 1=numbers, 2=letters, 3=signs, 4=minimal");
+ const bool invert = cimg_option("-invert",false,"Invert image intensities");
+ const float contour = (float)cimg_option("-contour",0.0f,"Use image contours higher than specified threshold");
+ const float blur = (float)cimg_option("-blur",0.8f,"Image pre-blur");
+ const float sigma = (float)cimg_option("-sigma",10.0f,"Font pre-blur");
+
+ int w = 79, h = 40;
+ std::sscanf(geom,"%d%*c%d",&w,&h);
+ if (cimg_option("-h",false,0)) std::exit(0);
+
+ // Init fonts
+ CImgList<> font_full = CImgList<>::font(13,false);
+ font_full.remove(0,255);
+ const int fw = font_full['A'].width(), fh = font_full['A'].height();
+ CImgList<> font, font_blur;
+ CImgList<unsigned char> font_code;
+
+ switch (alphabet) {
+ case 1: {
+ font_code.insert(CImg<>::vector(' '));
+ for (unsigned char l='0'; l<='9'; l++) font_code.insert(CImg<>::vector(l));
+ } break;
+ case 2: {
+ font_code.insert(CImg<>::vector(' '));
+ for (unsigned char l='A'; l<='Z'; l++) font_code.insert(CImg<>::vector(l));
+ } break;
+ case 3: {
+ font_code.insert(CImg<>::vector(' '));
+ font_code.insert(CImg<>::vector('-'));
+ font_code.insert(CImg<>::vector('_'));
+ font_code.insert(CImg<>::vector('|'));
+ font_code.insert(CImg<>::vector('/'));
+ font_code.insert(CImg<>::vector('\\'));
+ font_code.insert(CImg<>::vector('+'));
+ font_code.insert(CImg<>::vector('.'));
+ font_code.insert(CImg<>::vector('*'));
+ font_code.insert(CImg<>::vector('='));
+ font_code.insert(CImg<>::vector(']'));
+ font_code.insert(CImg<>::vector('['));
+ font_code.insert(CImg<>::vector('('));
+ font_code.insert(CImg<>::vector(')'));
+ font_code.insert(CImg<>::vector('{'));
+ font_code.insert(CImg<>::vector('}'));
+ font_code.insert(CImg<>::vector('"'));
+ font_code.insert(CImg<>::vector('!'));
+ font_code.insert(CImg<>::vector('$'));
+ } break;
+ case 4: {
+ font_code.insert(CImg<>::vector(' '));
+ font_code.insert(CImg<>::vector('.'));
+ font_code.insert(CImg<>::vector('/'));
+ font_code.insert(CImg<>::vector('\\'));
+ font_code.insert(CImg<>::vector('_'));
+ font_code.insert(CImg<>::vector('_'));
+ font_code.insert(CImg<>::vector('|'));
+ } break;
+ default: { for (unsigned char l=' '; l<='~'; l++) font_code.insert(CImg<>::vector(l)); } break;
+ }
+ cimglist_for(font_code,l) {
+ font.insert(font_full(font_code[l](0)));
+ font_blur.insert(font[l].get_resize(fw,fh,1,1).blur(sigma).normalize(0,255));
+ }
+
+ // Init images
+ CImg<> img;
+ if (!file_i) { float white[3] = { 255,255,255 }; img.assign().draw_text(0,0," CImg\nRocks !",white); }
+ else img.assign(file_i);
+ img.norm().resize(fw*w,fh*h);
+ if (blur) img.blur(blur);
+ if (contour>0) {
+ CImgList<> grad = img.get_gradient("xy",4);
+ img = (grad[0].pow(2) + grad[1].pow(2)).sqrt().normalize(0,100).threshold(contour);
+ }
+ img.normalize(0,255);
+ if (invert) img = 255.0f - img;
+ CImg<unsigned char> dest(w,h,1,1,0);
+
+ // Render ASCII-art image, using a simple correlation method.
+ CImg<> neigh;
+ cimg_forY(dest,y) { cimg_forX(dest,x) {
+ neigh = img.get_crop(x*fw,y*fh,(x + 1)*fw,(y + 1)*fh);
+ float scoremin = 2e28f;
+ unsigned int best = 0;
+ cimglist_for(font_code,l) {
+ const CImg<>& letter = font_blur[l];
+ const float score = (float)((letter - neigh).pow(2).sum());
+ if (score<scoremin) { scoremin = score; best = l; }
+ }
+ dest(x,y) = (unsigned char)best;
+ std::fprintf(stdout,"%c",font_code[dest(x,y)](0));
+ }
+ std::fprintf(stdout,"\n");
+ }
+
+ std::exit(0);
+ return 0;
+}