// DIB.cpp
#include "stdafx.h"
#include "DIB.h"
CDib::CDib()
{
// Set the Dib pointer to
// NULL so we know if it's
// been loaded.
m_pDib = NULL;
}
CDib::~CDib()
{
// If a Dib has been loaded,
// delete the memory.
if( m_pDib != NULL )
delete [] m_pDib;
}
BOOL CDib::Load( const char *pszFilename )
{
CFile cf;
// Attempt to open the Dib file for reading.
if( !cf.Open( pszFilename, CFile::modeRead ) )
return( FALSE );
// Get the size of the file and store
// in a local variable. Subtract the
// size of the BITMAPFILEHEADER structure
// since we won't keep that in memory.
DWORD dwDibSize;
dwDibSize =
cf.GetLength() - sizeof( BITMAPFILEHEADER );
// Attempt to allocate the Dib memory.
unsigned char *pDib;
pDib = new unsigned char [dwDibSize];
if( pDib == NULL )
return( FALSE );
BITMAPFILEHEADER BFH;
// Read in the Dib header and data.
try{
// Did we read in the entire BITMAPFILEHEADER?
if( cf.Read( &BFH, sizeof( BITMAPFILEHEADER ) )
!= sizeof( BITMAPFILEHEADER ) ||
// Is the type 'MB'?
BFH.bfType != 'MB' ||
// Did we read in the remaining data?
cf.Read( pDib, dwDibSize ) != dwDibSize ){
// Delete the memory if we had any
// errors and return FALSE.
delete [] pDib;
return( FALSE );
}
}
// If we catch an exception, delete the
// exception, the temporary Dib memory,
// and return FALSE.
catch( CFileException *e ){
e->Delete();
delete [] pDib;
return( FALSE );
}
// If we got to this point, the Dib has been
// loaded. If a Dib was already loaded into
// this class, we must now delete it.
if( m_pDib != NULL )
delete m_pDib;
// Store the local Dib data pointer and
// Dib size variables in the class member
// variables.
m_pDib = pDib;
m_dwDibSize = dwDibSize;
// Pointer our BITMAPINFOHEADER and RGBQUAD
// variables to the correct place in the Dib data.
m_pBIH = (BITMAPINFOHEADER *) m_pDib;
m_pPalette =
(RGBQUAD *) &m_pDib[sizeof(BITMAPINFOHEADER)];
// Calculate the number of palette entries.
m_nPaletteEntries = 1 << m_pBIH->biBitCount;
if( m_pBIH->biBitCount > 8 )
m_nPaletteEntries = 0;
else if( m_pBIH->biClrUsed != 0 )
m_nPaletteEntries = m_pBIH->biClrUsed;
// Point m_pDibBits to the actual Dib bits data.
m_pDibBits =
&m_pDib[sizeof(BITMAPINFOHEADER)+
m_nPaletteEntries*sizeof(RGBQUAD)];
// If we have a valid palette, delete it.
if( m_Palette.GetSafeHandle() != NULL )
m_Palette.DeleteObject();
// If there are palette entries, we'll need
// to create a LOGPALETTE then create the
// CPalette palette.
if( m_nPaletteEntries != 0 ){
// Allocate the LOGPALETTE structure.
LOGPALETTE *pLogPal = (LOGPALETTE *) new char
[sizeof(LOGPALETTE)+
m_nPaletteEntries*sizeof(PALETTEENTRY)];
if( pLogPal != NULL ){
// Set the LOGPALETTE to version 0x300
// and store the number of palette
// entries.
pLogPal->palVersion = 0x300;
pLogPal->palNumEntries = m_nPaletteEntries;
// Store the RGB values into each
// PALETTEENTRY element.
for( int i=0; i<m_nPaletteEntries; i++ ){
pLogPal->palPalEntry[i].peRed =
m_pPalette[i].rgbRed;
pLogPal->palPalEntry[i].peGreen =
m_pPalette[i].rgbGreen;
pLogPal->palPalEntry[i].peBlue =
m_pPalette[i].rgbBlue;
}
// Create the CPalette object and
// delete the LOGPALETTE memory.
m_Palette.CreatePalette( pLogPal );
delete [] pLogPal;
}
}
return( TRUE );
}
BOOL CDib::Save( const char *pszFilename )
{
// If we have no data, we can't save.
if( m_pDib == NULL )
return( FALSE );
CFile cf;
// Attempt to create the file.
if( !cf.Open( pszFilename,
CFile::modeCreate | CFile::modeWrite ) )
return( FALSE );
// Write the data.
try{
// First, create a BITMAPFILEHEADER
// with the correct data.
BITMAPFILEHEADER BFH;
memset( &BFH, 0, sizeof( BITMAPFILEHEADER ) );
BFH.bfType = 'MB';
BFH.bfSize = sizeof( BITMAPFILEHEADER ) + m_dwDibSize;
BFH.bfOffBits = sizeof( BITMAPFILEHEADER ) +
sizeof( BITMAPINFOHEADER ) +
m_nPaletteEntries * sizeof( RGBQUAD );
// Write the BITMAPFILEHEADER and the
// Dib data.
cf.Write( &BFH, sizeof( BITMAPFILEHEADER ) );
cf.Write( m_pDib, m_dwDibSize );
}
// If we get an exception, delete the exception and
// return FALSE.
catch( CFileException *e ){
e->Delete();
return( FALSE );
}
return( TRUE );
}
BOOL CDib::Draw( CDC *pDC, int nX, int nY, int nWidth, int nHeight )
{
// If we have not data we can't draw.
if( m_pDib == NULL )
return( FALSE );
// Check for the default values of -1
// in the width and height arguments. If
// we find -1 in either, we'll set them
// to the value that's in the BITMAPINFOHEADER.
if( nWidth == -1 )
nWidth = m_pBIH->biWidth;
if( nHeight == -1 )
nHeight = m_pBIH->biHeight;
// Use StretchDIBits to draw the Dib.
StretchDIBits( pDC->m_hDC, nX, nY,
nWidth, nHeight,
0, 0,
m_pBIH->biWidth, m_pBIH->biHeight,
m_pDibBits,
(BITMAPINFO *) m_pBIH,
BI_RGB, SRCCOPY );
return( TRUE );
}
BOOL CDib::SetPalette( CDC *pDC )
{
// If we have not data we
// won't want to set the palette.
if( m_pDib == NULL )
return( FALSE );
// Check to see if we have a palette
// handle. For Dibs greater than 8 bits,
// this will be NULL.
if( m_Palette.GetSafeHandle() == NULL )
return( TRUE );
// Select the palette, realize the palette,
// then finally restore the old palette.
CPalette *pOldPalette;
pOldPalette = pDC->SelectPalette( &m_Palette, FALSE );
pDC->RealizePalette();
pDC->SelectPalette( pOldPalette, FALSE );
return( TRUE );
}
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Implement the MFC source shown in the image
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jnlrxzi1.rar (22个子文件)
ShowDIB.dsp 4KB
Resource.h 495B
ShowDIB.h 1KB
ShowDIBView.cpp 2KB
Sample1.BMP 324KB
ShowDIB.plg 2KB
res
ShowDIB.rc2 399B
ShowDIBDoc.ico 1KB
ShowDIB.ico 1KB
ShowDIB.dsw 537B
ShowDIB.cpp 3KB
ShowDIB.clw 2KB
StdAfx.cpp 205B
3kDIB.cpp 6KB
ShowDIBDoc.cpp 1KB
MainFrm.h 1KB
StdAfx.h 928B
ShowDIB.rc 10KB
uDIB.h 453B
ShowDIBView.h 2KB
ShowDIBDoc.h 1KB
vMainFrm.cpp 1KB
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