PxPGetandSet.java

//-------------------------------------------------------
// our function for getting color components , it requires that you have global variables
// R,G,B   (not elegant but the simples way to go, see the example PxP methods in object for 
// a more elegant solution
int R, G, B, A;          // you must have these global varables to use the PxPGetPixel()
void PxPGetPixel(int x, int y, int[] pixelArray, int pixelsWidth) {
  int thisPixel=pixelArray[x+y*pixelsWidth];     // getting the colors as an int from the pixels[]
  A = (thisPixel >> 24) & 0xFF;                  // we need to shift and mask to get each component alone
  R = (thisPixel >> 16) & 0xFF;                  // this is faster than calling red(), green() , blue()
  G = (thisPixel >> 8) & 0xFF;   
  B = thisPixel & 0xFF;
}


//our function for setting color components RGB into the pixels[] , we need to efine the XY of where
// to set the pixel, the RGB values we want and the pixels[] array we want to use and it's width

void PxPSetPixel(int x, int y, int r, int g, int b, int a, int[] pixelArray, int pixelsWidth) {
  a =(a << 24);                       
  r = r << 16;                       // We are packing all 4 composents into one int
  g = g << 8;                        // so we need to shift them to their places
  color argb = a | r | g | b;        // binary "or" operation adds them all into one int
  pixelArray[x+y*pixelsWidth]= argb;    // finaly we set the int with te colors into the pixels[]
}