(C++) ImageToVector

 

Graphics code snippet to convert a VCL TImage to a 2D std::vector. To do the opposite, use VectorToImage.

 

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#include <cassert> #include <vector> #include <vcl.h> //Creates a 2D-std::vector (y-x-ordered) from a TImage //From http://www.richelbilderbeek.nl/CppImageToVector.htm const std::vector<std::vector<int> > ImageToVector(const TImage * const image) {   assert(image!=0 && "Image must not be NULL");   assert(image->Picture->Bitmap!=0 && "Bitmap must not be NULL");   assert(image->Picture->Bitmap->PixelFormat == pf24bit && "Bitmap must be 24 bit");   const int width  = image->Picture->Bitmap->Width;   const int height = image->Picture->Bitmap->Height;   std::vector<std::vector<int> > v(height, std::vector<int>(width));   for (int y=0; y!=height; ++y)   {     assert(y >= 0);     assert(y < static_cast<int>(v.size()));     std::vector<int>& vLine = v[y];     const unsigned char * const line       = static_cast<const unsigned char *>(image->Picture->Bitmap->ScanLine[y]);     for (int x=0; x!=width; ++x)     {       assert(x >= 0);       assert(x < static_cast<int>(vLine.size()));       const double grey = static_cast<double>(line[x*3+0] + line[x*3+1] + line[x*3+2])         / 3.0;       vLine[x] = grey;       assert(grey>=0.0 && grey<256.0);     }   }   return v; }