ccdc.cpp

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// $Id: ccdc.cpp 1354 2006-06-23 20:23:25Z alex $
/* @@tag:xara-cn@@ DO NOT MODIFY THIS LINE
================================XARAHEADERSTART===========================
 
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----------------------------------

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 */

// CC super version of the MFC CDC class

/*
*/

#include "camtypes.h"
#include "ccdc.h"
//#include "fixmem.h" - in camtypes.h [AUTOMATICALLY REMOVED]
//#include "ensure.h" - in camtypes.h [AUTOMATICALLY REMOVED]
//#include "gdimagic.h"
//#include "tim.h"
//#include "errors.h" - in camtypes.h [AUTOMATICALLY REMOVED]
//#include "colmodel.h" - in camtypes.h [AUTOMATICALLY REMOVED]
#include "camelot.h"


// How many individual regions should allow before we stick them all together
// It is set to be 10 rectangles by default.
#define MAX_REGIONS (sizeof(RGNDATAHEADER) + (40 * sizeof(RECT)))



/********************************************************************************************

>   class CCDC : public CDC

    Author:     Andy_Pennell (Xara Group Ltd) <camelotdev@xara.com>
    Created:    9/11/93
    Purpose:    A layer above the MFC CDC class which contains additional information,
                including a type word (see RenderType) and rectangle list information. Note 
                that is is derived from an MFC class, not CCObject so take care with 'new's
                and ISRUNTIME checks.
    SeeAlso:    CDC;CCPaintDC

********************************************************************************************/



// so we can runtime-check it

CC_IMPLEMENT_DYNAMIC( CCDC, ListItem )
CC_IMPLEMENT_DYNAMIC( CCPaintDC, CCDC )
CC_IMPLEMENT_DYNAMIC( CCClientDC, CCDC )
CC_IMPLEMENT_DYNAMIC( CCDummyDC, CCDC )

List CCDC::s_DCList;


/*********************************************************************************************

>   CCDC::CCDC(RenderType rType)

    Author:     Andy_Pennell (Xara Group Ltd) <camelotdev@xara.com>
    Created:    11/10/93
    Inputs:     The type of CCDC that is required.
    Outputs:    None
    Returns:    None
    Purpose:    Constructor for CCDC. Stores type and zeros rectangle list.
    Errors:     -
    Scope:      Public
    SeeAlso:    RenderType

*********************************************************************************************/ 

CCDC::CCDC( RenderType rType )
{
    lpRgnData = NULL;
    Type = rType;
    m_pDC = NULL;
    m_bDeleteDC = TRUE;
}

/*********************************************************************************************

>   CCDC::CCDC(CDC *cdc, RenderType rType)

    Author:     Andy_Pennell (Xara Group Ltd) <camelotdev@xara.com>
    Created:    11/10/93
    Inputs:     An exisiting CDC and the type of CCDC that is required.
    Outputs:    None
    Returns:    None
    Purpose:    Constructor for CCDC to base it on an existing CDC. The CDC on which this
                is based MUST stay in existance while this CCDC is in existence as it
                'borrows' the members from the doner CDC.
    Errors:     -
    Scope:      Public

*********************************************************************************************/ 

CCDC::CCDC( CNativeDC *pDC, RenderType rType )
{
    lpRgnData = NULL;
    Type = rType;
    m_pDC=NULL;
    m_bDeleteDC = FALSE;
    SetDC(pDC, FALSE); // previously m_pDC = pDC;
}

/*********************************************************************************************

>   CCDC::~CCDC()

    Author:     Andy_Pennell (Xara Group Ltd) <camelotdev@xara.com>
    Created:    11/10/93
    Inputs:     None
    Outputs:    None
    Returns:    None
    Purpose:    Destructor for CCDC.
    Errors:     -
    Scope:      Public

*********************************************************************************************/ 

CCDC::~CCDC()
{
    SetDC(NULL);
    CCFree(lpRgnData);
    lpRgnData = NULL;

    // Karim 06/06/2000 - NULLify our handles.
//  m_hDC = NULL;
//  m_hAttribDC = NULL;
}

/*********************************************************************************************

>   static CCDC *CCDC::ConvertFromNativeDC( CNativeDC* pDC )

    Author:     Andy_Pennell (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/10/93
    Inputs:     Pointer to a CDC.
    Outputs:    None
    Returns:    A pointer to a CCDC, or NULL if it cannot be safely cast.
    Purpose:    See if a CDC* is really a CCDC* which we can get useful extra information
                from.
    Errors:     -
    Scope:      Public

*********************************************************************************************/ 

CCDC *CCDC::ConvertFromNativeDC( CNativeDC* pDC )
{
    if (!pDC)
        return NULL;

    // Scan the DCList to find the item
    CCDC * pItem = (CCDC*)s_DCList.GetHead();
    while (pItem)
    {
        if (pItem->GetDC() == pDC)
            return pItem;

        pItem = (CCDC*)s_DCList.GetNext(pItem);
    }

    return NULL;
}

/*********************************************************************************************

>   static UINT32 CCDC::GetRectangleList( CDC*, wxRect **lpRect )

    Author:     Andy_Pennell (Xara Group Ltd) <camelotdev@xara.com>
    Created:    11/10/93
    Inputs:     None
    Outputs:    lpRect will point to a rectangle list. XRECT is a 32-bit rectangle, defined
                in gdimagic.h
    Returns:    Number of rectangles in list, or 0 for don't know.
    Purpose:    The whole point of CCDCs over normal CDCs is to get additional information.
                This call allows access to the clipping rectangle list. A zero return is not
                an error, it just means that the rectangle list is not known.
    Errors:     -
    Scope:      Public

*********************************************************************************************/ 

UINT32 CCDC::GetRectangleList( wxDC* pCDC, wxRect **lpRect)
{
    const CCDC *pCCDC = ConvertFromNativeDC(pCDC);

    if (pCCDC == NULL)
        return 0;                                       // if not a CCDC

#ifndef EXCLUDE_FROM_XARALX
    // Multi-region draw hints are only supported on MSW
#if defined( __WXMSW__ )
    if (pCCDC->lpRgnData && (pCCDC->lpRgnData->rdh.iType == RDH_RECTANGLES) )
    {
        *lpRect = (wxRect *)( &pCCDC->lpRgnData->Buffer );  // the address of the rectangle list
        return (UINT32)(pCCDC->lpRgnData->rdh.nCount);
    }
#endif
#endif
    return 0;
}

/*********************************************************************************************

>   static RenderType CCDC::GetType( CDC* pCDC, BOOL bCalculate)

    Author:     Andy_Pennell (Xara Group Ltd) <camelotdev@xara.com>
    Created:    11/10/93
    Inputs:     Pointer to a wxDC, bCalculate makes it return a valid type for wxDCs by
                asking GDI what the pCDC really points to. If bCalculate is FALSE and pCDC
                cannot be safely cast to a CCDC, returns RENDERTYPE_NONE as we cannot tell.
    Outputs:    None
    Returns:    The type of the CCDC
    Purpose:    Get an indication of the type of the render destination.
    Errors:     -
    Scope:      Public
    SeeAlso:    RenderType

*********************************************************************************************/ 

RenderType CCDC::GetType( CNativeDC* pDC, BOOL bCalculate)
{
    const CCDC *pCCDC = ConvertFromNativeDC( pDC );

    if (pCCDC == NULL)
    {
        PORTNOTETRACE("other","CCDC::GetType - can't calculate device type yet");
#ifndef EXCLUDE_FROM_XARALX
        if (bCalculate)
        {
            // work out the type from the HDC if he can. We don't use the MFC fn as
            // it gets the type from the attrib, not the actual HDC, though this screws
            // up with Print Preview
            switch ( ::GetDeviceCaps( pDC->m_hDC, TECHNOLOGY ) )
            {
                case DT_RASDISPLAY:
                    return RENDERTYPE_SCREEN;

                case DT_PLOTTER:
                case DT_RASPRINTER:
                    // Need to detect if this is a PostScript printer - this requires
                    // different code on different OSs.
                    // (This code taken from MSDN - PSS ID Number: Q124135)
                    WORD wEscape;                   

                    if (IsWin32NT() || IsWin32c())
                    {
                        wEscape = POSTSCRIPT_PASSTHROUGH; // Fails with Win16 driver
                        if (pDC->Escape(QUERYESCSUPPORT, sizeof(WORD), (LPCSTR) &wEscape, NULL) > 0)
                        {
                            // Found a PS printer
                            return RENDERTYPE_PRINTER_PS;
                        }
                    }
                    else if (IsWin32s())
                    {
                        // use printer escape to determine printer type.
                        wEscape = GETTECHNOLOGY;
                        if (pDC->Escape(QUERYESCSUPPORT, sizeof(WORD), (LPCSTR) &wEscape, NULL) > 0)
                        {
                            // Supports Escapes - get the technology info.
                            char Technology[256];
                            pDC->Escape(GETTECHNOLOGY, 0, NULL, 255, Technology);

                            // Does the technology description start with "postscript"?
                            if (_tcsncicmp(Technology, "postscript", 10) == 0)
                            {
                                // Ok - does it support passthrough?
                                wEscape = PASSTHROUGH;
                                if (pDC->Escape(QUERYESCSUPPORT, sizeof(WORD), 
                                                 (LPCSTR) &wEscape, NULL) > 0)
                                {
                                    // Found a PS printer
                                    return RENDERTYPE_PRINTER_PS;
                                }
                            }

                            // GETTECHNOLOGY might not work on some printer drivers, so
                            // try another escape - EPSPRINTING - should only work on PS!
                            wEscape = EPSPRINTING;
                            if (pDC->Escape(QUERYESCSUPPORT, sizeof(WORD), (LPCSTR) &wEscape, NULL) > 0)
                            {
                                // Supports EPS printing - must be PostScript.
                                return RENDERTYPE_PRINTER_PS;
                            }
                        }
                    }

                    // If we've got here its a normal (non-PS) printer.
                    return RENDERTYPE_PRINTER;

                case DT_METAFILE:
                    return RENDERTYPE_METAFILE16;               // 32-bit metafiles return their
                                                                // context device, which we
                                                                // cannot create anyway as yet
            }
        }
#endif

        return RENDERTYPE_NONE;
    }

    // its an actual CCDC so its type is well-known
    return pCCDC->Type;
}

/*********************************************************************************************

>   static BOOL CCDC::IsPaperWanted( RenderType )

    Author:     Andy_Pennell (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/10/93
    Inputs:     Type of rendering device
    Outputs:    None
    Returns:    TRUE if the device wants paper rendered (pages, backgrounds etc), FALSE
                if it does not.
    Purpose:    Used by the document renderer to decide whether paper-like things should be
                drawn.
    Errors:     -
    Scope:      Public

*********************************************************************************************/ 

BOOL CCDC::IsPaperWanted( RenderType rType )
{
    switch (rType)
    {
        case RENDERTYPE_SCREEN:
        case RENDERTYPE_SCREENXOR:
            return TRUE;

        case RENDERTYPE_PRINTER:
            return FALSE;

        case RENDERTYPE_MONOBITMAP:
            return FALSE;
        
        case RENDERTYPE_HITDETECT:
            return FALSE;
        
        case RENDERTYPE_COLOURBITMAP:
            return TRUE;

        case RENDERTYPE_METAFILE16:
        case RENDERTYPE_METAFILE32:
            return FALSE;

        default:
            TRACE( _T("Bad rendertype %d in IsPaperWanted\n"), rType );
            return TRUE;
    }
}


BOOL CCDC::CleanUpDCs(void)
{
    // Delete all the entries in the list (the item destructors will delete the DCs)
    s_DCList.DeleteAll();

    return(TRUE);
}


void CCDC::SetDC (CNativeDC * dc, BOOL bDeleteDC /*= TRUE*/)
{
    if (m_pDC == dc)
        return;

    if (m_pDC)
    {
        if (m_bDeleteDC)
            delete (m_pDC);
        // take us off the list
        s_DCList.RemoveItem(this);
    }
    m_pDC = dc;
    if (m_pDC)
    {
        m_bDeleteDC = bDeleteDC;
        // put us on the list
        s_DCList.AddTail(this);
    }
}

/********************************************************************************************

>   class CCPaintDC : public CCDC

    Author:     Andy_Pennell (Xara Group Ltd) <camelotdev@xara.com>
    Created:    9/11/93
    Purpose:    Similar to a CPaintDC but also gives us the functionality of a CCDC. In
                particular we can get at the clipping rectangle list.
    SeeAlso:    CCDC;CPaintDC

********************************************************************************************/


/*********************************************************************************************

>   CCPaintDC::CCPaintDC(CWnd* pWnd)

    Author:     Andy_Pennell (Xara Group Ltd) <camelotdev@xara.com>
    Created:    11/10/93
    Inputs:     Pointer to owner window.
    Outputs:    None
    Returns:    None
    Purpose:    Constructor for CCPaintDC which gets the update rectangle list before doing
                a BeginPaint.
    Errors:     -
    Scope:      Public
    SeeAlso:    CCDC;RenderType

*********************************************************************************************/ 

CCPaintDC::CCPaintDC(wxWindow *pWnd) : CCDC(RENDERTYPE_SCREEN), m_DC(pWnd)
{
    // Register this DC with the DC type system and set that it is temporary
    CCDC::SetDC(&m_DC, FALSE);

#ifndef EXCLUDE_FROM_XARALX
    // Loose the old region data
    CCFree( lpRgnData );
    lpRgnData = NULL;

    // Setup the DC
//  m_pDc       = this;
    m_clipping  = true;

#if defined(__WXMSW__)
    // before the BeginPaint we must extract
    // the update region. This is so we can more efficiently paint the window, especially after
    // diagonal scrolls.
    HRGN                hRgn = CreateRectRgn(0,0,0,0);
    if( hRgn )
    {
        INT32 result = ::GetUpdateRgn( HWND(pWnd->GetHandle()), hRgn, FALSE );
        if (result==COMPLEXREGION)
        {
            // How many regions are there in there
            DWORD res = GetRegionData( hRgn, 0, NULL );

            // If there are some and there are less than our limit then get the info about them
            if ((res!=0) && (res<MAX_REGIONS))
            {
                // alloc space to put the region data in
                lpRgnData = (LPRGNDATA)CCMalloc( res );
                if (lpRgnData)
                {
                    // alloced buffer - use it
                    lpRgnData->rdh.dwSize = sizeof(RGNDATAHEADER);
                    DWORD newres = GetRegionData( hRgn, res, lpRgnData );

                    // Note GetRegionData is documented wrongly - when it works it returns the size, not 1
                    if (newres!=res)
                    {
                        // error occurred somehow so tidy up heap
                        CCFree( lpRgnData );
                        lpRgnData = NULL;

                        if (newres!=0)
                            TRACE( _T("GetRegionData changed from %lu to %lu\n"), res, newres);
                    }
                }
            }
        }
        DeleteObject( hRgn );
    }
#endif
#endif
}


/*********************************************************************************************

>   CCPaintDC::~CCPaintDC()

    Author:     Andy_Pennell (Xara Group Ltd) <camelotdev@xara.com>
    Created:    11/10/93
    Inputs:     None
    Outputs:    None
    Returns:    None
    Purpose:    Destructor for CCPaintDC which does an EndPaint.
    Errors:     -
    Scope:      Public

*********************************************************************************************/ 

CCPaintDC::~CCPaintDC()
{
}

/*********************************************************************************************

>   CCClientDC::CCClientDC(CWnd* pWnd)

    Author:     Andy_Pennell (Xara Group Ltd) <camelotdev@xara.com>
    Created:    11/10/93
    Inputs:     Pointer to owner window.
    Outputs:    None
    Returns:    None
    Purpose:    Constructor for CCClientDC which gets the update rectangle list before doing
                a BeginPaint.
    Errors:     -
    Scope:      Public
    SeeAlso:    CCDC;RenderType

*********************************************************************************************/ 

CCClientDC::CCClientDC(wxWindow *pWnd) : CCDC(RENDERTYPE_SCREEN), m_DC(pWnd)
{
    // Register this DC with the DC type system and set that it is temporary
    CCDC::SetDC(&m_DC, FALSE);
}


/*********************************************************************************************

>   CCClientDC::~CCClientDC()

    Author:     Andy_Pennell (Xara Group Ltd) <camelotdev@xara.com>
    Created:    11/10/93
    Inputs:     None
    Outputs:    None
    Returns:    None
    Purpose:    Destructor for CCClientDC which does an EndPaint.
    Errors:     -
    Scope:      Public

*********************************************************************************************/ 

CCClientDC::~CCClientDC()
{
}

---