polygon.h

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#ifndef POLYGON_H_
#define POLYGON_H_
 
#include <cstring>
 
template<typename Pixel>
class Bitmap
{
  public:
    int width   { 0 };
    int height  { 0 };
    int extra;
    Pixel *data { nullptr };
 
    explicit Bitmap(int e = 0) : extra(e) {}
    ~Bitmap() { delete[] data; }
 
    void size(int w,int h)
    {
        delete[] data;
        width = w;
        height = h;
        data = new Pixel[2*w*h+extra];
        clear();
    }
  
    void clear()
    {
        memset(data,0,sizeof (Pixel)*(2*width*height+extra));
    }
};
#endif