(C++) Pixelate

 

The 'pixelate' function generalizes multiple pixels into one. The function relies heavily on the GetPixel, GetGreyness, SetPixel and SetGreyness functions.

 

'Pixelate' works under both CLX and VCL.

 

• View an example image demonstrating the 'Pixelate' function

 

 

 

 

 

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#include <cassert> #include <algorithm> //From http://www.richelbilderbeek.nl void DoPixelateRgb(   const TImage * const imageOriginal,   TImage * const imageResult,   const int pixelSize) {   assert(imageOriginal!=0);   assert(imageResult!=0);   imageResult->Picture->Graphic = imageOriginal->Picture->Graphic;   assert(imageOriginal->Picture->Bitmap->Width  == imageResult->Picture->Bitmap->Width );   assert(imageOriginal->Picture->Bitmap->Height == imageResult->Picture->Bitmap->Height);   const int width  = imageOriginal->Picture->Bitmap->Width;   const int height = imageOriginal->Picture->Bitmap->Height;   const int maxx = 1 + (width  / pixelSize);   const int maxy = 1 + (height / pixelSize);   for (int y=0; y!=maxy; ++y)   {     const int y1 = (y * pixelSize);     if (y1 >= height) continue;     const int y2 = std::min( y1 + pixelSize, height);     assert(y1 <= height);     assert(y2 <= height);     assert(y1!=y2);     for (int x=0; x!=maxx; ++x)     {       const int x1 = (x * pixelSize);       if (x1 >= width) continue;       const int x2 = std::min( x1 + pixelSize, width);       assert(x1 <= width);       assert(x2 <= width);       assert(x1!=x2);       unsigned char r,g,b;       GetPixel(imageOriginal,         x1, y1, x2, y2,         r,g,b);       SetPixel(         imageResult,         x1, y1, x2, y2,         r,g,b);     }   } } #include <cassert> #include <algorithm> //From http://www.richelbilderbeek.nl void DoPixelateGrey(   const TImage * const imageOriginal,   TImage * const imageResult,   const int pixelSize) {   assert(imageOriginal!=0);   assert(imageResult!=0);   imageResult->Picture->Graphic = imageOriginal->Picture->Graphic;   assert(imageOriginal->Picture->Bitmap->Width  == imageResult->Picture->Bitmap->Width );   assert(imageOriginal->Picture->Bitmap->Height == imageResult->Picture->Bitmap->Height);   const int width  = imageOriginal->Picture->Bitmap->Width;   const int height = imageOriginal->Picture->Bitmap->Height;   const int maxx = 1 + (width  / pixelSize);   const int maxy = 1 + (height / pixelSize);   for (int y=0; y!=maxy; ++y)   {     const int y1 = (y * pixelSize);     if (y1 >= height) continue;     const int y2 = std::min( y1 + pixelSize, height );     assert(y1 <= height);     assert(y2 <= height);     assert(y1!=y2);     for (int x=0; x!=maxx; ++x)     {       const int x1 = (x * pixelSize);       if (x1 >= width) continue;       const int x2 = std::min( x1 + pixelSize, width );       assert(x1 <= width);       assert(x2 <= width);       assert(x1!=x2);       const int grey = GetGreyness(imageOriginal,x1,y1,x2,y2);       SetGreyness(imageResult,x1,y1,x2,y2,grey);     }   } }