cegraphics.cpp

windows mobile应用的图形库

/* ---------------------------------------------------------------------------------------------------
 *  
 *                          Windows CE Graphics Libary v1.00.0000
 *  
 *        
 *    Written by James.
 *    Bug report : [e-mail]
 *                                                             Copyright 2001
 */
//-----------------------------------------------------------------------------------------------------

/*
 * Created by James D. 2001.
 * Date: 01/11/2001
 */

#include "StdAfx.h"
#include "CEGraphics.h"
#include "CEGDefine.h"

//
// Function : CEGraphics()
// Purpose  : Construction function.
//
CCEGraphics::CCEGraphics()
{
	m_pVB           = NULL;
	m_pDoubleBuffer = NULL;
	m_bSuspend      = FALSE;
	m_bDirectDraw   = FALSE;
	m_dwDrawState   = 0;
	m_dwLastError   = 0;
}

//
// Function : CEGraphics()
// Purpose  : Destruction function.
//
CCEGraphics::~CCEGraphics()
{
	// Release the memory buffer.
	if( NULL != m_pDoubleBuffer ) 
	{
		free( m_pDoubleBuffer );
		m_pDoubleBuffer = NULL;
	}
}

//
// Function : Create( HWND hWnd )
// Purpose  : Create the CEGraphics Object, And Open the Display for use.
//
HRESULT CCEGraphics::Create( HWND hWnd )
{
	if( GXOpenDisplay( hWnd, GX_FULLSCREEN ) == 0 )
	{
		// Error in open display.
		m_dwLastError = CEG_GRAPH_OPENDISP_FAILED;
		return ::GetLastError();
	}

	if( GXOpenInput() == 0 )
	{
		// Error in Open the direct input key.
		m_dwLastError = CEG_GRAPH_OPENINPUT_FAILED;
		return ::GetLastError();
	}

	// Get the display properties.
	m_gxdp = GXGetDisplayProperties();
	// Get the default key properties.
	m_gxkl = GXGetDefaultKeys(GX_NORMALKEYS);

	//if( m_gxdp.ffFormat & kfDirect555 ) MessageBox( NULL, L"kfDirect555", L"Test", MB_OK );
	//if( m_gxdp.ffFormat & kfDirect565 ) MessageBox( NULL, L"kfDirect565", L"Test", MB_OK );
	//if( m_gxdp.ffFormat & kfDirect444 ) MessageBox( NULL, L"kfDirect444", L"Test", MB_OK );
	//if( m_gxdp.ffFormat & kfDirectInverted ) MessageBox( NULL, L"kfInverted", L"Test", MB_OK );
	// Calc the X and Y Pitch's
	m_cbxPitch = m_gxdp.cbxPitch;
	m_cbyPitch = m_gxdp.cbyPitch;

	// Create the back buffer...
	m_lMemorySize = m_gxdp.cxWidth * m_gxdp.cyHeight * m_gxdp.cBPP / 8;

	m_pDoubleBuffer = (unsigned char*)malloc( m_lMemorySize );
	// Failed to alloc memory.
	if( NULL == m_pDoubleBuffer ) 
	{
		m_dwLastError = CEG_GRAPH_MEMALLOC_FAILED;
		return FALSE;
	}
	m_pVB = m_pDoubleBuffer; // copy the backbuffer address

	/* --- Set the back buffer to the right position --- */
	if( m_cbxPitch < 0 ) m_pVB += m_gxdp.cxWidth * ( - m_cbxPitch );
	if( m_cbyPitch < 0 ) m_pVB += m_gxdp.cyHeight * ( - m_cbyPitch );
    /* --- End ---*/

	// Save the windows handel.
	m_hWnd = hWnd;

	return TRUE;
}

//
// Function : Release()
// Purpose  : Release the CEGraphics Object.
//
HRESULT CCEGraphics::Release()
{
	if( GXCloseInput() == 0 )
	{
		// Error...
		m_dwLastError = CEG_GRAPH_CLOSEINPUT_FAILED;
		return ::GetLastError();
	}
	if( GXCloseDisplay() == 0 )
	{
		// Error...
		m_dwLastError = CEG_GRAPH_CLOSEDISP_FAILED;
		return ::GetLastError();
	}
	if( NULL != m_pDoubleBuffer ) 
	{
		free( m_pDoubleBuffer );
		m_pDoubleBuffer = NULL;
	}
	return TRUE;
}

//
// Function : BeginDraw( void )
// Purpose  : Prepares the display for writing
//	          Lock the video memory and return the buffer pointer to the variary m_pVB.
//
HRESULT CCEGraphics::BeginDraw( void )
{
	// if the system suspend, do not call the gxbegindraw()
	if( m_bSuspend ) 
	{
		m_dwLastError = CEG_GRAPH_SUSPENDED;
		return FALSE;
	}

	// Check the background buffer...
	if( NULL == m_pDoubleBuffer )
	{
		// Return false
		m_dwLastError = CEG_GRAPH_BEGINDRAW_FAILED;
		return FALSE;
	}

	// Drawing....
	m_dwDrawState = 1;

	return TRUE;
}

//
// Function : EndDraw( void )
// Purpose  : Finished drawing.
//
HRESULT CCEGraphics::EndDraw( void )
{
	// if the system suspend, do not call the gxenddraw()
	if( m_bSuspend ) 
	{
		m_dwLastError = CEG_GRAPH_SUSPENDED;
		return FALSE;
	}
	if( NULL == m_pDoubleBuffer ) 
	{
		m_dwLastError = CEG_GRAPH_VB_NULL;
		return FALSE;
	}

	// Set the drawstate NULL
	m_dwDrawState    = 0;
	return TRUE;
}

//
// Function : Flip ()
// Purpose  : Take the page flip.
//
HRESULT	CCEGraphics::Flip( void )
{
	if( m_bSuspend ) 
	{
		m_dwLastError = CEG_GRAPH_SUSPENDED;
		return FALSE;
	}
	if( NULL == m_pDoubleBuffer )
	{
		m_dwLastError = CEG_GRAPH_VB_NULL;
		return FALSE;
	}
	// Get the video system buffer...
	m_pDisplayMemory = (unsigned char*)GXBeginDraw();
	if( NULL == m_pDisplayMemory )
	{
		// Return false
		m_dwLastError = CEG_GRAPH_BEGINDRAW_FAILED;
		return FALSE;
	}

	// Persent the memory flip....
	// Copy the memory buffer to the display memory.
	memcpy( (m_pDisplayMemory + ( m_pDoubleBuffer - m_pVB ) ) , m_pDoubleBuffer, m_lMemorySize );
	// End the gx draw.
	if( GXEndDraw() == 0 )
	{
		// Error...
		m_dwLastError = CEG_GRAPH_ENDDRAW_FAILED;
		return GetLastError();
	}
	m_pDisplayMemory = NULL;
	return TRUE;
}

//
// Function : Suspend() & Resume()
// Purpose  : Suspend and Resume the operations.
//
HRESULT CCEGraphics::Suspend( void )
{
	if( GXSuspend() == 0 )
	{
		// Error....
		m_dwLastError = CEG_GRAPH_SUSPEND_FAILED;
		return ::GetLastError();
	}
	// if the system suspend, do not call the gxbegindraw()
	m_bSuspend = TRUE;
	return TRUE;
}

HRESULT CCEGraphics::Resume( void )
{
	if( GXResume() == 0 )
	{
		// Error....
		m_dwLastError = CEG_GRAPH_RESUME_FAILED;
		return ::GetLastError();
	}
	m_bSuspend = FALSE;
	return TRUE;
}

//
// Function : SetDrawMode()
// Purpose  : Do Not Use Page flip, direct draw screen only!!!
// NOTE     : Must careful use this function!!!!!!!!!!!
//
HRESULT CCEGraphics::SetDrawMode( DWORD dwMode )
{
	BOOL bDirectDraw;
	// Set the draw mode
	if( dwMode == CEG_DRAWMODE_DIRECTDRAW ) bDirectDraw = TRUE;
	else bDirectDraw = FALSE;

	// Return False if the Video buffer null
	if( m_pVB == NULL ) return FALSE;
	// SetDirectDraw can not been used in begindraw/enddraw
	if( m_dwDrawState == 1 ) return FALSE;

	if( bDirectDraw != m_bDirectDraw )
	{
		if( bDirectDraw )
		{
			// Get the video buffer...
			m_pDisplayMemory = (unsigned char*)GXBeginDraw();
			if( NULL == m_pDisplayMemory )
			{
				// Return false
				return FALSE;
			}
			// Save the buffer pointer...
			unsigned char* pTemp = m_pVB;
			m_pVB                = m_pDisplayMemory;
			m_pDisplayMemory     = pTemp;
			m_bDirectDraw        = bDirectDraw;
		}
		else if ( bDirectDraw == FALSE && m_pVB != NULL )
		{
			if( GXEndDraw() == 0 )
			{
				// Error...
				return ::GetLastError();
			}
			m_pVB            = m_pDisplayMemory;
			m_pDisplayMemory = NULL;
			m_bDirectDraw    = bDirectDraw;
		}
		
	}

	// Return successfully.
	return TRUE;
}