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(C++) VectorToImage

Graphics code snippet to let a 2D std::vector be drawn on a VCL TImage. To do the opposite, use ImageToVector.

* View the code of 'VectorToImage' in plain text.

#include <cassert>

#include <vector>

#include <vcl.h>

//Draws a (grey) TImage from a 2D-std::vector (y-x-ordered)

//From http://www.richelbilderbeek.nl/CppVectorToImage.htm

void VectorToImage(const std::vector < std::vector <int> >& v, 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 height = v.size();

const int width = v[0].size();

image->Picture->Bitmap->Height = height;

image->Picture->Bitmap->Width = width;

for (int y=0; y!=height; ++y)

{

assert(y >= 0);

assert(y < static_cast<int>(v.size()));

const std::vector<int>& vLine = v[y];

unsigned char * const line

= static_cast<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 int grey = vLine[x];

line[x*3+2] = grey; //Red

line[x*3+1] = grey; //Green

line[x*3+0] = grey; //Blue

}

}

}

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