simplepic.h

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/****************************************************************************
* VCGLib                                                            o o     *
* Visual and Computer Graphics Library                            o     o   *
*                                                                _   O  _   *
* Copyright(C) 2004                                                \/)\/    *
* Visual Computing Lab                                            /\/|      *
* ISTI - Italian National Research Council                           |      *
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* for more details.                                                         *
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#ifndef __VCG_SIMPLE_PIC
#define __VCG_SIMPLE_PIC
#include <vcg/math/matrix44.h>

namespace vcg {
  template <class PixType> 
  class SimplePic
  {public:
    std::vector<PixType> img;
   int sx,sy;
   void Create(int tx,int ty)
   {
     sx=tx;sy=ty;
     img.resize(sx*sy);
   }
   PixType &Pix(int x, int y) {return img[sx*y+x];}

   void OpenGLSnap(GLenum format=0)
        {
                int vp[4];
                glGetIntegerv( GL_VIEWPORT,vp );                // Lettura viewport
                glPixelStorei( GL_PACK_ROW_LENGTH, 0);
                glPixelStorei( GL_PACK_ALIGNMENT, 1);
                int tx = vp[2];
                int ty = vp[3];

                Create(tx,ty);

                GLenum mtype  = 0;

                if(format==0) {
                                format = GL_RGBA;
        mtype = GL_UNSIGNED_BYTE;
                }
                if(format==GL_DEPTH_COMPONENT) {
                                format = GL_DEPTH_COMPONENT;
        mtype = GL_FLOAT;
                }
                glReadPixels(vp[0],vp[1],vp[2],vp[3],format,mtype,(GLvoid *)&img[0]);
        }
        bool SavePPM( const char * filename )
        {
                FILE * fp = fopen(filename,"wb");
                if(fp==0) return false;


                        fprintf(fp,"P6\n%d %d\n255\n",sx,sy);

                        for(int i=0;i<sx*sy;++i)
                        {
                         fwrite(&(img[i]),3,1,fp);
                        }
        
                fclose(fp);
                return true;
        }

};

}
#endif // __VCG_MESH_VISIBILITY