colorHistogram.cpp

// This may look like C code, but it is really -*- C++ -*-
//
// Copyright Bob Friesenhahn, 2003
//
// Test STL colorHistogram function
//
 
#undef USE_VECTOR
#define USE_MAP
 
#include <Magick++.h>
#include <string>
#include <iostream>
#include <iomanip>
#if defined(USE_VECTOR)
#  include <vector>
#  include <utility>
#endif
#if defined(USE_MAP)
#  include <map>
#endif
 
using namespace std;
 
using namespace Magick;
 
int main( int /*argc*/, char ** argv)
{
 
  // Initialize ImageMagick install location for Windows
  MagickPlusPlusGenesis genesis(*argv);
 
  int failures=0;
 
  try {
 
    string srcdir("");
    if(getenv("SRCDIR") != 0)
      srcdir = getenv("SRCDIR");
 
    // Read image
    Image image;
    image.read( srcdir + "test_image.miff" );
 
    // Create histogram vector
#if defined(USE_MAP)
    std::map<Color,size_t> histogram;
#elif defined(USE_VECTOR)
    std::vector<std::pair<Color,size_t> > histogram;
#endif
 
    colorHistogram( &histogram, image );
 
    // Print out histogram
#if (MAGICKCORE_QUANTUM_DEPTH == 8)
    int quantum_width=3;
#elif (MAGICKCORE_QUANTUM_DEPTH == 16)
    int quantum_width=5;
#else
    int quantum_width=10;
#endif
 
    cout << "Histogram for file \"" << image.fileName() << "\"" << endl
         << histogram.size() << " entries:" << endl;
 
#if defined(USE_MAP)
    std::map<Color,size_t>::const_iterator p=histogram.begin();
#elif defined(USE_VECTOR)
    std::vector<std::pair<Color,size_t> >::const_iterator p=histogram.begin();
#endif
    while (p != histogram.end())
      {
        cout << setw(10) << (int)p->second << ": ("
             << setw(quantum_width) << (int)p->first.quantumRed() << ","
             << setw(quantum_width) << (int)p->first.quantumGreen() << ","
             << setw(quantum_width) << (int)p->first.quantumBlue() << ")"
             << endl;
        p++;
      }
  }
 
  catch( Exception &error_ )
    {
      cout << "Caught exception: " << error_.what() << endl;
      return 1;
    }
  catch( exception &error_ )
    {
      cout << "Caught exception: " << error_.what() << endl;
      return 1;
    }
 
  if ( failures )
    {
      cout << failures << " failures" << endl;
      return 1;
    }
  
  return 0;
}