source: abuse/trunk/src/smoosh.cpp @ 129 Tweet

/*
 *  Abuse - dark 2D side-scrolling platform game
 *  Copyright (c) 1995 Crack dot Com
 *
 *  This software was released into the Public Domain. As with most public
 *  domain software, no warranty is made or implied by Crack dot Com or
 *  Jonathan Clark.
 */

#include "config.h"

#define PARTICLE_SIZE 2            // 2x2 block of pixels

class particle
{
public :
  unsigned char *pict;
  int x,y;
  particle *left,*right,*up,*down;
  particle(int X, int Y, int size);
  ~particle() { free(pict); }
} ;

particle::particle(int X, int Y, image *im, int size);
{
  x=X; y=Y;
  left=right=up=down=NULL;
  pict=(unsigned char *)malloc(size*size);
}

class particle_image
{
  int particles;
  particle *top;
  int size;
public :
  particle_image(image *im, int particle_size);       // im will be erased!
} ;


particle_image::particle_image(image *im, int particle_size)
{
  int x,y,py,p;
  unsigned char *sl,*sl2;
  top=NULL;
  size=particle_size;

  int matw=(im->width()+size-1)/size,math=(im->height()+size-1)/size;
  particle *matrix[matw*math];


  // break the image up into particles and store in a big matrix
  for (y=0;y<im->height();y++)
  {
    sl=im->scan_line(y);
    py=y/size;
    for (x=0;x<im->width();x++,sl+=px)
    {
      px=x/size;
      sl2=matrix[py*matw+px]->pict+(y%size)*size;      // address of particle image memory

      int copy_size;

      memset(sl2,0,size);

      if (*sl)
      {
    px=x/size;
    py=y/size;
      }

  }
  if (px<0)       // couldn't find any non-blank pixels
    particles=0;
  else
    add_particle_line(px,py,im);
}