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    /*****************************************************************************
    *                                                                             
    *   BitMask.cpp                                                            
    *                                                                             
    *   Electrical Engineering Faculty - Software Lab                             
    *   Spring semester 1998                                                      
    *                                                                             
    *   Tanks game                                                                
    *                                                                             
    *   Module description: Each game object has one or more bitmaps. In order to 
    *                       calculate collision detection between 2 objects, we 
    *                       need to find which part of the object's bitmap is 
    *                       overlapping the other object's bitmap. 
    *                       If we find at least one pixel overlapping,
    *                       that is not a background colored pixel,
    *                       than we have a collision. To save the effort of 
    *                       comparing bitmaps of 24 bpp, we make a mask for each
    *                       bitmap, of only 1 byte per pixel - a pixel w/ value
    *                       0 is a background (transparent) one, and w/ value 1 is
    *                       part of the game object.
    *                       
    *                                                                             
    *   Authors: Eran Yariv - 28484475                                           
    *            Moshe Zur  - 24070856                                           
    *                                                                            
    *                                                                            
    *   Date: 23/09/98                                                           
    *                                                                            
    ******************************************************************************/
    #include "stdafx.h"
    #include "BitMask.h"
    #include "GameConsts.h"
    
    /*------------------------------------------------------------------------------
    
      Function: Constructor.
    
      Purpose:  Constructs a bit mask for the associated bitmap.
    
      Input:    dib: A game object bitmap.
    
      Output:   None.
    
      Remarks:  Along with the bit mask, we calculate the borders of the object 
                actuall image inside the bitmap.
    
    ------------------------------------------------------------------------------*/
    CBitMask::CBitMask(CDIB& dib) : m_Size(dib.Size()), m_BitMask(new BYTE[m_Size.cy * m_Size.cx])
    {
        ASSERT(m_BitMask);
        PPIXEL Bits = (PPIXEL)dib.m_pBits;
        BYTE *Masks = m_BitMask;
        m_ActualRect.top = m_ActualRect.left = LONG_MAX; 
        m_ActualRect.right = m_ActualRect.bottom = LONG_MIN; 
        for (int x = 0; x < m_Size.cx; x++)
            for (int y = 0; y < m_Size.cy; y++)
            {
                *Masks++ = (*Bits++ != TRANSP_COLOR);
                if (TRANSP_COLOR != dib.ColorAt (x,y))
                {   // Real pixel
                    m_ActualRect.top = min (m_ActualRect.top, y);
                    m_ActualRect.left = min (m_ActualRect.left, x);
                    m_ActualRect.right = max (m_ActualRect.right, x);
                    m_ActualRect.bottom = max (m_ActualRect.bottom, y);
                }
            }
    }
    
    

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