C / C++ / MFC

m_blendfunc.BlendOp = AC_SRC_OVER;
m_blendfunc.BlendFlags = 0;
m_blendfunc.SourceConstantAlpha = 0;
m_blendfunc.AlphaFormat = AC_SRC_ALPHA;

AlphaBlend( hmemdc, prc->left	- m_shadowPosX + Border, prc->top + m_shadowPosY  + Border,  	
		    prc->right  - prc->left + borderRatio, prc->bottom - prc->top + borderRatio, 
		    hSrcDc, 0, 0, bmp.bmWidth, bmp.bmHeight, m_blendfunc );

void CPipWnd::ReplaceColor( HBITMAP &_hBmp, COLORREF _cOldColor, COLORREF _cNewColor, 
							   bool _selectRange )
{
	if ( _hBmp )
	{	
		HDC hbufferDC = CreateCompatibleDC( NULL );	// DC for Source Bitmap
		if ( hbufferDC )
		{
			HGDIOBJ hpreviousBufferObject = SelectObject( hbufferDC, _hBmp );
			// here hbufferDC contains the bitmap
			
			HDC hdirectDC = CreateCompatibleDC( NULL );	// DC for working		
			if( hdirectDC )
			{
				// Get bitmap size
				BITMAP bm;
				GetObject( _hBmp, sizeof( bm ), &bm );
				
				// create a BITMAPINFO with minimal initilisation for the CreateDIBSection
				BITMAPINFO RGB32BitsBITMAPINFO; 
				ZeroMemory( &RGB32BitsBITMAPINFO, sizeof( BITMAPINFO ) );
				RGB32BitsBITMAPINFO.bmiHeader.biSize     = sizeof( BITMAPINFOHEADER );
				RGB32BitsBITMAPINFO.bmiHeader.biWidth    = bm.bmWidth;
				RGB32BitsBITMAPINFO.bmiHeader.biHeight   = bm.bmHeight;
				RGB32BitsBITMAPINFO.bmiHeader.biPlanes   = 1;
				RGB32BitsBITMAPINFO.bmiHeader.biBitCount = 32;
				UINT * ptPixels;	// pointer used for direct Bitmap pixels access
				
				HBITMAP hdirectBitmap = CreateDIBSection( hdirectDC, ( BITMAPINFO* )&RGB32BitsBITMAPINFO, 
					DIB_RGB_COLORS, ( void** )&ptPixels, NULL, 0 );

				if ( hdirectBitmap )
				{
					// here hdirectBitmap!=NULL so ptPixels!=NULL no need to test
					HGDIOBJ hpreviousObject = SelectObject( hdirectDC, hdirectBitmap );
					BitBlt( hdirectDC, 0, 0, bm.bmWidth, bm.bmHeight, hbufferDC, 0, 0, SRCCOPY );			
					// here the hdirectDC contains the bitmap

					// Convert COLORREF to RGB 
					_cOldColor = COLORREF2RGB( _cOldColor );
					_cNewColor = COLORREF2RGB( _cNewColor );
                					
					// After all the inits we can do the job : Replace Color
					for ( int i = ( ( bm.bmWidth * bm.bmHeight ) - 1 ); i >= 0; --i )
					{
						if( _selectRange )
						{
							//if ( ptPixels[i] >= _cOldColor )	
                                                            //ptPixels[i] = _cNewColor;
							{
								
								COLORREF clrRef = COLORREF( ptPixels[i] );
								clrRef = COLORREF2RGB( clrRef );
								BYTE r = GetRValue( _cNewColor );
								BYTE g = GetGValue( _cNewColor );
								BYTE b = GetBValue( _cNewColor );
								BYTE *ptr = reinterpret_cast<BYTE*>( &clrRef );
								ptr[0] = *ptr;
								ptr[1] = r;
								ptr[2] = g;
								ptr[3] = b;
								ptPixels[i] = clrRef;
								
							}
						}
						else
						{
							if ( ptPixels[i] <= _cOldColor )
                                                            ptPixels[i] = _cNewColor;
						}
					}
					
					// Don't delete the result of SelectObject because it's our modified bitmap (hdirectBitmap)
					SelectObject( hdirectDC, hpreviousObject );
					// finish
				//<VIVEK.MANE> Start 2008/Jan/19
					if( _hBmp )
					{
						DeleteObject( _hBmp );
						_hBmp = NULL;
					}
					_hBmp = hdirectBitmap;
				//<VIVEK.MANE> End 2008/Jan/19
				}
				// clean up
				DeleteDC( hdirectDC );
			}
			SelectObject( hbufferDC, hpreviousBufferObject );
			// hdufferDC is now useless
			DeleteDC( hbufferDC );
		}
	}
}