childfrm.cpp

C:Documents and SettingsAdministrator桌面VC++多媒体特效制作百例CHAR03PCXView

// ChildFrm.cpp : implementation of the CChildFrame class
//

#include "stdafx.h"
#include "PCXView.h"

#include <io.h>            // _filelength()

#include "ChildFrm.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CChildFrame

IMPLEMENT_DYNCREATE(CChildFrame, CMDIChildWnd)

BEGIN_MESSAGE_MAP(CChildFrame, CMDIChildWnd)
	//{{AFX_MSG_MAP(CChildFrame)
	ON_COMMAND(ID_FILE_CLOSE, OnFileClose)
	ON_WM_CREATE()
	ON_WM_SETFOCUS()
	ON_WM_ERASEBKGND()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CChildFrame construction/destruction

CChildFrame::CChildFrame() : psBmpInfo(NULL), pabRawBitmap(NULL),
                             BitmapSize(CSize(0,0))
{
	// TODO: add member initialization code here
	
}

CChildFrame::~CChildFrame()
{
   if ( psBmpInfo )
      delete [] psBmpInfo;
   if ( pabRawBitmap )
      delete [] pabRawBitmap;

}

BOOL CChildFrame::PreCreateWindow(CREATESTRUCT& cs)
{
	if( !CMDIChildWnd::PreCreateWindow(cs) )
		return FALSE;

	cs.style = WS_CHILD | WS_VISIBLE | WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU
		| FWS_ADDTOTITLE | WS_THICKFRAME;
	cs.dwExStyle &= ~WS_EX_CLIENTEDGE;
	cs.lpszClass = AfxRegisterWndClass(0);


	return TRUE;
}



/////////////////////////////////////////////////////////////////////////////
// CChildFrame diagnostics

#ifdef _DEBUG
void CChildFrame::AssertValid() const
{
	CMDIChildWnd::AssertValid();
}

void CChildFrame::Dump(CDumpContext& dc) const
{
	CMDIChildWnd::Dump(dc);
}

#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CChildFrame message handlers

void CChildFrame::OnFileClose() 
{
	SendMessage(WM_CLOSE);
}

int CChildFrame::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
	if (CMDIChildWnd::OnCreate(lpCreateStruct) == -1)
		return -1;
	
	// create a view to occupy the client area of the frame
	if (!m_wndView.Create(NULL, NULL, AFX_WS_DEFAULT_VIEW, 
		CRect(0, 0, 0, 0), this, AFX_IDW_PANE_FIRST, NULL))
	{
		TRACE0("Failed to create view window\n");
		return -1;
	}

   return 0;
}

void CChildFrame::OnSetFocus(CWnd* pOldWnd) 
{
	CMDIChildWnd::OnSetFocus(pOldWnd);
	
	m_wndView.SetFocus();
	
}

BOOL CChildFrame::OnCmdMsg(UINT nID, int nCode, void* pExtra, AFX_CMDHANDLERINFO* pHandlerInfo) 
{
	// let the view have first crack at the command
	if (m_wndView.OnCmdMsg(nID, nCode, pExtra, pHandlerInfo))
		return TRUE;
	
	// otherwise, do default handling
	return CMDIChildWnd::OnCmdMsg(nID, nCode, pExtra, pHandlerInfo);
}

//
// *** LoadPCX
//
void CChildFrame::LoadPCX( LPCSTR lpcszFilename )
{
   // Standard PCX header
   struct PCXHead {
     char   ID;
     char   Version;
     char   Encoding;
     char   BitPerPixel;
     short  X1;
     short  Y1;
     short  X2;
     short  Y2;
     short  HRes;
     short  VRes;
     char   ClrMap[16*3];
     char   Reserved1;
     char   NumPlanes;
     short  BPL;
     short  Pal_t;
     char   Filler[58];
   } sHeader;

   // Open the file and put its entire content in memory
   FILE *pFile = fopen( lpcszFilename, "rb" );
   if ( !pFile )
   {
      MessageBox("Unable to open the PCX file");
      return;
   }
   const long clFileSize = _filelength(_fileno(pFile));
   BYTE *pabFileData = (BYTE *)new BYTE[ clFileSize ];
   fread( pabFileData, clFileSize, 1, pFile );
   fclose( pFile );

   // Get the header
   memcpy( &sHeader, pabFileData, sizeof(sHeader) );

   // Each scan line MUST have a size that can be divided by a 'long' data type
   int iScanLineSize = sHeader.NumPlanes * sHeader.BPL;
   ldiv_t sDivResult = ldiv( iScanLineSize, sizeof(long) );
   if ( sDivResult.rem > 0 )
      iScanLineSize = (iScanLineSize/sizeof(long)+1) * sizeof(long);

   // Set the bitmap size data member
   BitmapSize = CSize( sHeader.X2-sHeader.X1+1, sHeader.Y2-sHeader.Y1+1 );
   const long clImageSize = iScanLineSize * BitmapSize.cy;

   // Set the bitmap information
   psBmpInfo = (BITMAPINFO *)new BYTE[ sizeof(BITMAPINFOHEADER) +
                                             (sizeof(RGBQUAD)*256) ];
   psBmpInfo->bmiHeader.biSize           = sizeof(BITMAPINFOHEADER);
   psBmpInfo->bmiHeader.biWidth          = BitmapSize.cx;
   psBmpInfo->bmiHeader.biHeight         = -BitmapSize.cy;
   psBmpInfo->bmiHeader.biPlanes         = sHeader.NumPlanes;
   psBmpInfo->bmiHeader.biBitCount       = sHeader.BitPerPixel;
   psBmpInfo->bmiHeader.biCompression    = BI_RGB;
   psBmpInfo->bmiHeader.biSizeImage      = 0;
   psBmpInfo->bmiHeader.biXPelsPerMeter  = 0;
   psBmpInfo->bmiHeader.biYPelsPerMeter  = 0;
   psBmpInfo->bmiHeader.biClrUsed        = 0;
   psBmpInfo->bmiHeader.biClrImportant   = 0;

   // Prepare a buffer large enough to hold the image
   pabRawBitmap = (BYTE *)new BYTE[ clImageSize ];
   if ( !pabRawBitmap )
   {
      MessageBox( "Can't allocate memory for the image" );
      delete [] pabFileData;
      return;
   }

   // Get the compressed image
   long lDataPos = 0;
   long lPos = 128;     // That's where the data begins

   for ( int iY=0; iY < BitmapSize.cy; iY++ )
   {
      // Decompress the scan line
      for ( int iX=0; iX < sHeader.BPL; )
      {
         UINT uiValue = pabFileData[lPos++];
         if ( uiValue > 192 ) {  // Two high bits are set = Repeat
            uiValue -= 192;                  // Repeat how many times?
            BYTE Color = pabFileData[lPos++];  // What color?

            if ( iX <= BitmapSize.cx )
            {  // Image data.  Place in the raw bitmap.
               for ( BYTE bRepeat=0; bRepeat < uiValue; bRepeat++ )
               {
                  pabRawBitmap[lDataPos++] = Color;
                  iX++;
               }
            }
            else
               iX += uiValue; // Outside the image.  Skip.
         }
         else
         {
            if ( iX <= BitmapSize.cx )
               pabRawBitmap[lDataPos++] = uiValue;
            iX++;
         }
      }

      // Pad the rest with zeros
      if ( iX < iScanLineSize )
      {
         for ( ;iX < iScanLineSize; iX++ )
            pabRawBitmap[lDataPos++] = 0;
      }
   }

   if ( pabFileData[lPos++] == 12 )          // Simple validation
      // Get the palette
      for ( short Entry=0; Entry < 256; Entry++ )
      {
         psBmpInfo->bmiColors[Entry].rgbRed       = pabFileData[lPos++];
         psBmpInfo->bmiColors[Entry].rgbGreen     = pabFileData[lPos++];
         psBmpInfo->bmiColors[Entry].rgbBlue      = pabFileData[lPos++];
         psBmpInfo->bmiColors[Entry].rgbReserved  = 0;
      }

   delete [] pabFileData;

   // Resize/Repaint the window
   const CSize BorderSize( GetSystemMetrics( SM_CXEDGE ) +
                           GetSystemMetrics( SM_CXFRAME ) - 1,
                           GetSystemMetrics( SM_CYEDGE ) +
                           GetSystemMetrics( SM_CYFRAME ) - 1 );
   SetWindowPos( NULL, 0, 0, BitmapSize.cx + (BorderSize.cx*2),
                 BitmapSize.cy + (BorderSize.cy*2)+GetSystemMetrics(SM_CYCAPTION),
                 SWP_NOMOVE | SWP_NOZORDER );
}

BOOL CChildFrame::OnEraseBkgnd(CDC* pDC) 
{
   if ( pabRawBitmap && psBmpInfo )
      // Display the image
      SetDIBitsToDevice( *pDC, 0, 0,
                         BitmapSize.cx, BitmapSize.cy, 0, 0,
                         0, BitmapSize.cy,
                         pabRawBitmap, psBmpInfo, DIB_RGB_COLORS);
	
	return CMDIChildWnd::OnEraseBkgnd(pDC);;
}