Invert (mirror) a bitmap

Two functions have been listed below, one of them will draw the image onto a device context after inverting it and the other will create a new bitmap with the inverted image.

Function 1: DrawInvertedBitmap

// DrawInvertedBitmap	- Draws the bitmap after inverting it
// hBimtap		- Bitmap handle
// hPal			- Palette to use when drawing the bitmap
// bLateral		- Flag to indicate whether to invert laterally or vertically
// xDest		- X coordinate of top left corner to draw at
// yDest		- Y coordinate of top left corner to draw at
void DrawInvertedBitmap( CDC *pDC, HBITMAP hBitmap, HPALETTE hPal, BOOL bLateral, 
							int xDest, int yDest )
{
	// Create a memory DC compatible with the destination DC
	CDC memDC;
	memDC.CreateCompatibleDC( pDC );

	// Get logical coordinates
	BITMAP bm;
	::GetObject( hBitmap, sizeof( bm ), &bm );

	//memDC.SelectObject( &bitmap );
	HBITMAP hBmOld = (HBITMAP)::SelectObject( memDC.m_hDC, hBitmap );
	
	
	// Select and realize the palette
	if( hPal && pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE)
	{
		SelectPalette( pDC->GetSafeHdc(), hPal, FALSE );
		pDC->RealizePalette();
	}
	if( bLateral )
		pDC->StretchBlt( xDest, yDest, bm.bmWidth, bm.bmHeight, &memDC, 
				bm.bmWidth-1, 0, -bm.bmWidth, bm.bmHeight, SRCCOPY );
	else
		pDC->StretchBlt( xDest, yDest, bm.bmWidth, bm.bmHeight, &memDC, 
				0, bm.bmHeight-1, bm.bmWidth, -bm.bmHeight, SRCCOPY );

	// Restore the old bitmap
	::SelectObject( memDC.m_hDC, hBmOld );
}

Function 2: GetInvertedBitmap

// GetInvertedBitmap	- Creates a new bitmap with the inverted image
// Returns		- Handle to a new bitmap with inverted image
// hBitmap		- Bitmap to invert
// bLateral		- Flag to indicate whether to invert laterally or vertically
HBITMAP GetInvertedBitmap( HBITMAP hBitmap, BOOL bLateral )
{
	// Create a memory DC compatible with the display
	CDC sourceDC, destDC;
	sourceDC.CreateCompatibleDC( NULL );
	destDC.CreateCompatibleDC( NULL );

	// Get logical coordinates
	BITMAP bm;
	::GetObject( hBitmap, sizeof( bm ), &bm );

	// Create a bitmap to hold the result
	HBITMAP hbmResult = ::CreateCompatibleBitmap(CClientDC(NULL), 
						bm.bmWidth, bm.bmHeight);

	// Select bitmaps into the DCs
	HBITMAP hbmOldSource = (HBITMAP)::SelectObject( sourceDC.m_hDC, hBitmap );
	HBITMAP hbmOldDest = (HBITMAP)::SelectObject( destDC.m_hDC, hbmResult );
	
	if( bLateral )
		destDC.StretchBlt( 0, 0, bm.bmWidth, bm.bmHeight, &sourceDC, 
				bm.bmWidth-1, 0, -bm.bmWidth, bm.bmHeight, SRCCOPY );
	else
		destDC.StretchBlt( 0, 0, bm.bmWidth, bm.bmHeight, &sourceDC, 
				0, bm.bmHeight-1, bm.bmWidth, -bm.bmHeight, SRCCOPY );

	// Reselect the old bitmaps
	::SelectObject( sourceDC.m_hDC, hbmOldSource );
	::SelectObject( destDC.m_hDC, hbmOldDest );

	return hbmResult;
}