src/msw/metafile.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        src/msw/metafile.cpp
// Purpose:     wxMetafileDC etc.
// Author:      Julian Smart
// Modified by: VZ 07.01.00: implemented wxMetaFileDataObject
// Created:     04/01/98
// RCS-ID:      $Id$
// Copyright:   (c) Julian Smart
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

// ============================================================================
// declarations
// ============================================================================

// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
    #pragma hdrstop
#endif

#ifndef WX_PRECOMP
    #include "wx/utils.h"
    #include "wx/app.h"
#endif

#include "wx/metafile.h"

#if wxUSE_METAFILE && !defined(wxMETAFILE_IS_ENH)

#include "wx/clipbrd.h"
#include "wx/msw/private.h"

#include <stdio.h>
#include <string.h>

// ----------------------------------------------------------------------------
// wxWin macros
// ----------------------------------------------------------------------------

IMPLEMENT_DYNAMIC_CLASS(wxMetafile, wxObject)
IMPLEMENT_ABSTRACT_CLASS(wxMetafileDC, wxDC)

// ============================================================================
// implementation
// ============================================================================

// ----------------------------------------------------------------------------
// wxMetafileRefData
// ----------------------------------------------------------------------------

/*
 * Metafiles
 * Currently, the only purpose for making a metafile is to put
 * it on the clipboard.
 */

wxMetafileRefData::wxMetafileRefData()
{
    m_metafile = 0;
    m_windowsMappingMode = wxMM_ANISOTROPIC;
    m_width = m_height = 0;
}

wxMetafileRefData::~wxMetafileRefData()
{
    if (m_metafile)
    {
        DeleteMetaFile((HMETAFILE) m_metafile);
        m_metafile = 0;
    }
}

// ----------------------------------------------------------------------------
// wxMetafile
// ----------------------------------------------------------------------------

wxMetafile::wxMetafile(const wxString& file)
{
    m_refData = new wxMetafileRefData;

    M_METAFILEDATA->m_windowsMappingMode = wxMM_ANISOTROPIC;
    M_METAFILEDATA->m_metafile = 0;
    if (!file.empty())
        M_METAFILEDATA->m_metafile = (WXHANDLE) GetMetaFile(file);
}

wxMetafile::~wxMetafile()
{
}

bool wxMetafile::SetClipboard(int width, int height)
{
#if !wxUSE_CLIPBOARD
    return false;
#else
    if (!m_refData)
        return false;

    bool alreadyOpen = wxClipboardOpen();
    if (!alreadyOpen)
    {
        wxOpenClipboard();
        if (!wxEmptyClipboard())
            return false;
    }
    bool success = wxSetClipboardData(wxDF_METAFILE, this, width,height);
    if (!alreadyOpen)
        wxCloseClipboard();

    return success;
#endif
}

bool wxMetafile::Play(wxDC *dc)
{
    if (!m_refData)
        return false;

    dc->BeginDrawing();

    if (dc->GetHDC() && M_METAFILEDATA->m_metafile)
    {
        if ( !::PlayMetaFile(GetHdcOf(*dc), (HMETAFILE)
                             M_METAFILEDATA->m_metafile) )
        {
            wxLogLastError(_T("PlayMetaFile"));
        }
    }

    dc->EndDrawing();

    return true;
}

void wxMetafile::SetHMETAFILE(WXHANDLE mf)
{
    if (!m_refData)
        m_refData = new wxMetafileRefData;

    M_METAFILEDATA->m_metafile = mf;
}

void wxMetafile::SetWindowsMappingMode(int mm)
{
    if (!m_refData)
        m_refData = new wxMetafileRefData;

    M_METAFILEDATA->m_windowsMappingMode = mm;
}

// ----------------------------------------------------------------------------
// Metafile device context
// ----------------------------------------------------------------------------

// Original constructor that does not takes origin and extent. If you use this,
// *DO* give origin/extent arguments to wxMakeMetafilePlaceable.
wxMetafileDC::wxMetafileDC(const wxString& file)
{
    m_metaFile = NULL;
    m_minX = 10000;
    m_minY = 10000;
    m_maxX = -10000;
    m_maxY = -10000;
    //  m_title = NULL;

    if (!file.IsNull() && wxFileExists(file))
        wxRemoveFile(file);

    if (!file.IsNull() && (file != wxEmptyString))
        m_hDC = (WXHDC) CreateMetaFile(file);
    else
        m_hDC = (WXHDC) CreateMetaFile(NULL);

    m_ok = (m_hDC != (WXHDC) 0) ;

    // Actual Windows mapping mode, for future reference.
    m_windowsMappingMode = wxMM_TEXT;

    SetMapMode(wxMM_TEXT); // NOTE: does not set HDC mapmode (this is correct)
}

// New constructor that takes origin and extent. If you use this, don't
// give origin/extent arguments to wxMakeMetafilePlaceable.
wxMetafileDC::wxMetafileDC(const wxString& file, int xext, int yext, int xorg, int yorg)
{
    m_minX = 10000;
    m_minY = 10000;
    m_maxX = -10000;
    m_maxY = -10000;
    if ( !file.empty() && wxFileExists(file))
        wxRemoveFile(file);
    m_hDC = (WXHDC) CreateMetaFile(file);

    m_ok = true;

    ::SetWindowOrgEx((HDC) m_hDC,xorg,yorg, NULL);
    ::SetWindowExtEx((HDC) m_hDC,xext,yext, NULL);

    // Actual Windows mapping mode, for future reference.
    m_windowsMappingMode = wxMM_ANISOTROPIC;

    SetMapMode(wxMM_TEXT); // NOTE: does not set HDC mapmode (this is correct)
}

wxMetafileDC::~wxMetafileDC()
{
    m_hDC = 0;
}

void wxMetafileDC::GetTextExtent(const wxString& string, long *x, long *y,
                                 long *descent, long *externalLeading, wxFont *theFont, bool WXUNUSED(use16bit)) const
{
    wxFont *fontToUse = theFont;
    if (!fontToUse)
        fontToUse = (wxFont*) &m_font;

    HDC dc = GetDC(NULL);

    SIZE sizeRect;
    TEXTMETRIC tm;
    ::GetTextExtentPoint32(dc, WXSTRINGCAST string, wxStrlen(WXSTRINGCAST string), &sizeRect);
    GetTextMetrics(dc, &tm);

    ReleaseDC(NULL, dc);

    if ( x )
        *x = sizeRect.cx;
    if ( y )
        *y = sizeRect.cy;
    if ( descent )
        *descent = tm.tmDescent;
    if ( externalLeading )
        *externalLeading = tm.tmExternalLeading;
}

void wxMetafileDC::DoGetSize(int *width, int *height) const
{
    wxCHECK_RET( m_refData, _T("invalid wxMetafileDC") );

    if ( width )
        *width = M_METAFILEDATA->m_width;
    if ( height )
        *height = M_METAFILEDATA->m_height;
}

wxMetafile *wxMetafileDC::Close()
{
    SelectOldObjects(m_hDC);
    HANDLE mf = CloseMetaFile((HDC) m_hDC);
    m_hDC = 0;
    if (mf)
    {
        wxMetafile *wx_mf = new wxMetafile;
        wx_mf->SetHMETAFILE((WXHANDLE) mf);
        wx_mf->SetWindowsMappingMode(m_windowsMappingMode);
        return wx_mf;
    }
    return NULL;
}

void wxMetafileDC::SetMapMode(int mode)
{
    m_mappingMode = mode;

    //  int pixel_width = 0;
    //  int pixel_height = 0;
    //  int mm_width = 0;
    //  int mm_height = 0;

    float mm2pixelsX = 10.0;
    float mm2pixelsY = 10.0;

    switch (mode)
    {
        case wxMM_TWIPS:
            {
                m_logicalScaleX = (float)(twips2mm * mm2pixelsX);
                m_logicalScaleY = (float)(twips2mm * mm2pixelsY);
                break;
            }
        case wxMM_POINTS:
            {
                m_logicalScaleX = (float)(pt2mm * mm2pixelsX);
                m_logicalScaleY = (float)(pt2mm * mm2pixelsY);
                break;
            }
        case wxMM_METRIC:
            {
                m_logicalScaleX = mm2pixelsX;
                m_logicalScaleY = mm2pixelsY;
                break;
            }
        case wxMM_LOMETRIC:
            {
                m_logicalScaleX = (float)(mm2pixelsX/10.0);
                m_logicalScaleY = (float)(mm2pixelsY/10.0);
                break;
            }
        default:
        case wxMM_TEXT:
            {
                m_logicalScaleX = 1.0;
                m_logicalScaleY = 1.0;
                break;
            }
    }
}

// ----------------------------------------------------------------------------
// wxMakeMetafilePlaceable
// ----------------------------------------------------------------------------

#ifdef __WIN32__
struct RECT32
{
  short left;
  short top;
  short right;
  short bottom;
};

struct mfPLACEABLEHEADER {
    DWORD    key;
    short    hmf;
    RECT32    bbox;
    WORD    inch;
    DWORD    reserved;
    WORD    checksum;
};
#else
struct mfPLACEABLEHEADER {
    DWORD    key;
    HANDLE    hmf;
    RECT    bbox;
    WORD    inch;
    DWORD    reserved;
    WORD    checksum;
};
#endif

/*
 * Pass filename of existing non-placeable metafile, and bounding box.
 * Adds a placeable metafile header, sets the mapping mode to anisotropic,
 * and sets the window origin and extent to mimic the wxMM_TEXT mapping mode.
 *
 */

bool wxMakeMetafilePlaceable(const wxString& filename, float scale)
{
    return wxMakeMetafilePlaceable(filename, 0, 0, 0, 0, scale, false);
}

bool wxMakeMetafilePlaceable(const wxString& filename, int x1, int y1, int x2, int y2, float scale, bool useOriginAndExtent)
{
    // I'm not sure if this is the correct way of suggesting a scale
    // to the client application, but it's the only way I can find.
    int unitsPerInch = (int)(576/scale);

    mfPLACEABLEHEADER header;
    header.key = 0x9AC6CDD7L;
    header.hmf = 0;
    header.bbox.left = (int)(x1);
    header.bbox.top = (int)(y1);
    header.bbox.right = (int)(x2);
    header.bbox.bottom = (int)(y2);
    header.inch = unitsPerInch;
    header.reserved = 0;

    // Calculate checksum
    WORD *p;
    mfPLACEABLEHEADER *pMFHead = &header;
    for (p =(WORD *)pMFHead,pMFHead -> checksum = 0;
            p < (WORD *)&pMFHead ->checksum; ++p)
        pMFHead ->checksum ^= *p;

    FILE *fd = wxFopen(filename.fn_str(), _T("rb"));
    if (!fd) return false;

    wxChar tempFileBuf[256];
    wxGetTempFileName(wxT("mf"), tempFileBuf);
    FILE *fHandle = wxFopen(wxFNCONV(tempFileBuf), _T("wb"));
    if (!fHandle)
        return false;
    fwrite((void *)&header, sizeof(unsigned char), sizeof(mfPLACEABLEHEADER), fHandle);

    // Calculate origin and extent
    int originX = x1;
    int originY = y1;
    int extentX = x2 - x1;
    int extentY = (y2 - y1);

    // Read metafile header and write
    METAHEADER metaHeader;
    fread((void *)&metaHeader, sizeof(unsigned char), sizeof(metaHeader), fd);

    if (useOriginAndExtent)
        metaHeader.mtSize += 15;
    else
        metaHeader.mtSize += 5;

    fwrite((void *)&metaHeader, sizeof(unsigned char), sizeof(metaHeader), fHandle);

    // Write SetMapMode, SetWindowOrigin and SetWindowExt records
    char modeBuffer[8];
    char originBuffer[10];
    char extentBuffer[10];
    METARECORD *modeRecord = (METARECORD *)&modeBuffer;

    METARECORD *originRecord = (METARECORD *)&originBuffer;
    METARECORD *extentRecord = (METARECORD *)&extentBuffer;

    modeRecord->rdSize = 4;
    modeRecord->rdFunction = META_SETMAPMODE;
    modeRecord->rdParm[0] = MM_ANISOTROPIC;

    originRecord->rdSize = 5;
    originRecord->rdFunction = META_SETWINDOWORG;
    originRecord->rdParm[0] = originY;
    originRecord->rdParm[1] = originX;

    extentRecord->rdSize = 5;
    extentRecord->rdFunction = META_SETWINDOWEXT;
    extentRecord->rdParm[0] = extentY;
    extentRecord->rdParm[1] = extentX;

    fwrite((void *)modeBuffer, sizeof(char), 8, fHandle);

    if (useOriginAndExtent)
    {
        fwrite((void *)originBuffer, sizeof(char), 10, fHandle);
        fwrite((void *)extentBuffer, sizeof(char), 10, fHandle);
    }

    int ch = -2;
    while (ch != EOF)
    {
        ch = getc(fd);
        if (ch != EOF)
        {
            putc(ch, fHandle);
        }
    }
    fclose(fHandle);
    fclose(fd);
    wxRemoveFile(filename);
    wxCopyFile(tempFileBuf, filename);
    wxRemoveFile(tempFileBuf);
    return true;
}


#if wxUSE_DRAG_AND_DROP

// ----------------------------------------------------------------------------
// wxMetafileDataObject
// ----------------------------------------------------------------------------

size_t wxMetafileDataObject::GetDataSize() const
{
    return sizeof(METAFILEPICT);
}

bool wxMetafileDataObject::GetDataHere(void *buf) const
{
    METAFILEPICT *mfpict = (METAFILEPICT *)buf;
    const wxMetafile& mf = GetMetafile();

    wxCHECK_MSG( mf.GetHMETAFILE(), false, _T("copying invalid metafile") );

    // doesn't seem to work with any other mapping mode...
    mfpict->mm   = MM_ANISOTROPIC; //mf.GetWindowsMappingMode();
    mfpict->xExt = mf.GetWidth();
    mfpict->yExt = mf.GetHeight();

    // transform the picture size to HIMETRIC units (0.01mm) - as we don't know
    // what DC the picture will be rendered to, use the default display one
    PixelToHIMETRIC(&mfpict->xExt, &mfpict->yExt);

    mfpict->hMF  = CopyMetaFile((HMETAFILE)mf.GetHMETAFILE(), NULL);

    return true;
}

bool wxMetafileDataObject::SetData(size_t WXUNUSED(len), const void *buf)
{
    const METAFILEPICT *mfpict = (const METAFILEPICT *)buf;

    wxMetafile mf;
    mf.SetWindowsMappingMode(mfpict->mm);

    LONG w = mfpict->xExt,
         h = mfpict->yExt;
    if ( mfpict->mm == MM_ANISOTROPIC )
    {
        // in this case xExt and yExt contain suggested size in HIMETRIC units
        // (0.01 mm) - transform this to something more reasonable (pixels)
        HIMETRICToPixel(&w, &h);
    }

    mf.SetWidth(w);
    mf.SetHeight(h);
    mf.SetHMETAFILE((WXHANDLE)mfpict->hMF);

    wxCHECK_MSG( mfpict->hMF, false, _T("pasting invalid metafile") );

    SetMetafile(mf);

    return true;
}

#endif // wxUSE_DRAG_AND_DROP

#endif // wxUSE_METAFILE
Commit	Line	Data
	1	/////////////////////////////////////////////////////////////////////////////
	2	// Name: src/msw/metafile.cpp
	3	// Purpose: wxMetafileDC etc.
	4	// Author: Julian Smart
	5	// Modified by: VZ 07.01.00: implemented wxMetaFileDataObject
	6	// Created: 04/01/98
	7	// RCS-ID: $Id$
	8	// Copyright: (c) Julian Smart
	9	// Licence: wxWindows licence
	10	/////////////////////////////////////////////////////////////////////////////
	11
	12	// ============================================================================
	13	// declarations
	14	// ============================================================================
	15
	16	// ----------------------------------------------------------------------------
	17	// headers
	18	// ----------------------------------------------------------------------------
	19
	20	// For compilers that support precompilation, includes "wx.h".
	21	#include "wx/wxprec.h"
	22
	23	#ifdef __BORLANDC__
	24	#pragma hdrstop
	25	#endif
	26
	27	#ifndef WX_PRECOMP
	28	#include "wx/utils.h"
	29	#include "wx/app.h"
	30	#endif
	31
	32	#include "wx/metafile.h"
	33
	34	#if wxUSE_METAFILE && !defined(wxMETAFILE_IS_ENH)
	35
	36	#include "wx/clipbrd.h"
	37	#include "wx/msw/private.h"
	38
	39	#include <stdio.h>
	40	#include <string.h>
	41
	42	// ----------------------------------------------------------------------------
	43	// wxWin macros
	44	// ----------------------------------------------------------------------------
	45
	46	IMPLEMENT_DYNAMIC_CLASS(wxMetafile, wxObject)
	47	IMPLEMENT_ABSTRACT_CLASS(wxMetafileDC, wxDC)
	48
	49	// ============================================================================
	50	// implementation
	51	// ============================================================================
	52
	53	// ----------------------------------------------------------------------------
	54	// wxMetafileRefData
	55	// ----------------------------------------------------------------------------
	56
	57	/*
	58	* Metafiles
	59	* Currently, the only purpose for making a metafile is to put
	60	* it on the clipboard.
	61	*/
	62
	63	wxMetafileRefData::wxMetafileRefData()
	64	{
	65	m_metafile = 0;
	66	m_windowsMappingMode = wxMM_ANISOTROPIC;
	67	m_width = m_height = 0;
	68	}
	69
	70	wxMetafileRefData::~wxMetafileRefData()
	71	{
	72	if (m_metafile)
	73	{
	74	DeleteMetaFile((HMETAFILE) m_metafile);
	75	m_metafile = 0;
	76	}
	77	}
	78
	79	// ----------------------------------------------------------------------------
	80	// wxMetafile
	81	// ----------------------------------------------------------------------------
	82
	83	wxMetafile::wxMetafile(const wxString& file)
	84	{
	85	m_refData = new wxMetafileRefData;
	86
	87	M_METAFILEDATA->m_windowsMappingMode = wxMM_ANISOTROPIC;
	88	M_METAFILEDATA->m_metafile = 0;
	89	if (!file.empty())
	90	M_METAFILEDATA->m_metafile = (WXHANDLE) GetMetaFile(file);
	91	}
	92
	93	wxMetafile::~wxMetafile()
	94	{
	95	}
	96
	97	bool wxMetafile::SetClipboard(int width, int height)
	98	{
	99	#if !wxUSE_CLIPBOARD
	100	return false;
	101	#else
	102	if (!m_refData)
	103	return false;
	104
	105	bool alreadyOpen = wxClipboardOpen();
	106	if (!alreadyOpen)
	107	{
	108	wxOpenClipboard();
	109	if (!wxEmptyClipboard())
	110	return false;
	111	}
	112	bool success = wxSetClipboardData(wxDF_METAFILE, this, width,height);
	113	if (!alreadyOpen)
	114	wxCloseClipboard();
	115
	116	return success;
	117	#endif
	118	}
	119
	120	bool wxMetafile::Play(wxDC *dc)
	121	{
	122	if (!m_refData)
	123	return false;
	124
	125	dc->BeginDrawing();
	126
	127	if (dc->GetHDC() && M_METAFILEDATA->m_metafile)
	128	{
	129	if ( !::PlayMetaFile(GetHdcOf(*dc), (HMETAFILE)
	130	M_METAFILEDATA->m_metafile) )
	131	{
	132	wxLogLastError(_T("PlayMetaFile"));
	133	}
	134	}
	135
	136	dc->EndDrawing();
	137
	138	return true;
	139	}
	140
	141	void wxMetafile::SetHMETAFILE(WXHANDLE mf)
	142	{
	143	if (!m_refData)
	144	m_refData = new wxMetafileRefData;
	145
	146	M_METAFILEDATA->m_metafile = mf;
	147	}
	148
	149	void wxMetafile::SetWindowsMappingMode(int mm)
	150	{
	151	if (!m_refData)
	152	m_refData = new wxMetafileRefData;
	153
	154	M_METAFILEDATA->m_windowsMappingMode = mm;
	155	}
	156
	157	// ----------------------------------------------------------------------------
	158	// Metafile device context
	159	// ----------------------------------------------------------------------------
	160
	161	// Original constructor that does not takes origin and extent. If you use this,
	162	// DO give origin/extent arguments to wxMakeMetafilePlaceable.
	163	wxMetafileDC::wxMetafileDC(const wxString& file)
	164	{
	165	m_metaFile = NULL;
	166	m_minX = 10000;
	167	m_minY = 10000;
	168	m_maxX = -10000;
	169	m_maxY = -10000;
	170	// m_title = NULL;
	171
	172	if (!file.IsNull() && wxFileExists(file))
	173	wxRemoveFile(file);
	174
	175	if (!file.IsNull() && (file != wxEmptyString))
	176	m_hDC = (WXHDC) CreateMetaFile(file);
	177	else
	178	m_hDC = (WXHDC) CreateMetaFile(NULL);
	179
	180	m_ok = (m_hDC != (WXHDC) 0) ;
	181
	182	// Actual Windows mapping mode, for future reference.
	183	m_windowsMappingMode = wxMM_TEXT;
	184
	185	SetMapMode(wxMM_TEXT); // NOTE: does not set HDC mapmode (this is correct)
	186	}
	187
	188	// New constructor that takes origin and extent. If you use this, don't
	189	// give origin/extent arguments to wxMakeMetafilePlaceable.
	190	wxMetafileDC::wxMetafileDC(const wxString& file, int xext, int yext, int xorg, int yorg)
	191	{
	192	m_minX = 10000;
	193	m_minY = 10000;
	194	m_maxX = -10000;
	195	m_maxY = -10000;
	196	if ( !file.empty() && wxFileExists(file))
	197	wxRemoveFile(file);
	198	m_hDC = (WXHDC) CreateMetaFile(file);
	199
	200	m_ok = true;
	201
	202	::SetWindowOrgEx((HDC) m_hDC,xorg,yorg, NULL);
	203	::SetWindowExtEx((HDC) m_hDC,xext,yext, NULL);
	204
	205	// Actual Windows mapping mode, for future reference.
	206	m_windowsMappingMode = wxMM_ANISOTROPIC;
	207
	208	SetMapMode(wxMM_TEXT); // NOTE: does not set HDC mapmode (this is correct)
	209	}
	210
	211	wxMetafileDC::~wxMetafileDC()
	212	{
	213	m_hDC = 0;
	214	}
	215
	216	void wxMetafileDC::GetTextExtent(const wxString& string, long x, long y,
	217	long descent, long externalLeading, wxFont *theFont, bool WXUNUSED(use16bit)) const
	218	{
	219	wxFont *fontToUse = theFont;
	220	if (!fontToUse)
	221	fontToUse = (wxFont*) &m_font;
	222
	223	HDC dc = GetDC(NULL);
	224
	225	SIZE sizeRect;
	226	TEXTMETRIC tm;
	227	::GetTextExtentPoint32(dc, WXSTRINGCAST string, wxStrlen(WXSTRINGCAST string), &sizeRect);
	228	GetTextMetrics(dc, &tm);
	229
	230	ReleaseDC(NULL, dc);
	231
	232	if ( x )
	233	*x = sizeRect.cx;
	234	if ( y )
	235	*y = sizeRect.cy;
	236	if ( descent )
	237	*descent = tm.tmDescent;
	238	if ( externalLeading )
	239	*externalLeading = tm.tmExternalLeading;
	240	}
	241
	242	void wxMetafileDC::DoGetSize(int width, int height) const
	243	{
	244	wxCHECK_RET( m_refData, _T("invalid wxMetafileDC") );
	245
	246	if ( width )
	247	*width = M_METAFILEDATA->m_width;
	248	if ( height )
	249	*height = M_METAFILEDATA->m_height;
	250	}
	251
	252	wxMetafile *wxMetafileDC::Close()
	253	{
	254	SelectOldObjects(m_hDC);
	255	HANDLE mf = CloseMetaFile((HDC) m_hDC);
	256	m_hDC = 0;
	257	if (mf)
	258	{
	259	wxMetafile *wx_mf = new wxMetafile;
	260	wx_mf->SetHMETAFILE((WXHANDLE) mf);
	261	wx_mf->SetWindowsMappingMode(m_windowsMappingMode);
	262	return wx_mf;
	263	}
	264	return NULL;
	265	}
	266
	267	void wxMetafileDC::SetMapMode(int mode)
	268	{
	269	m_mappingMode = mode;
	270
	271	// int pixel_width = 0;
	272	// int pixel_height = 0;
	273	// int mm_width = 0;
	274	// int mm_height = 0;
	275
	276	float mm2pixelsX = 10.0;
	277	float mm2pixelsY = 10.0;
	278
	279	switch (mode)
	280	{
	281	case wxMM_TWIPS:
	282	{
	283	m_logicalScaleX = (float)(twips2mm * mm2pixelsX);
	284	m_logicalScaleY = (float)(twips2mm * mm2pixelsY);
	285	break;
	286	}
	287	case wxMM_POINTS:
	288	{
	289	m_logicalScaleX = (float)(pt2mm * mm2pixelsX);
	290	m_logicalScaleY = (float)(pt2mm * mm2pixelsY);
	291	break;
	292	}
	293	case wxMM_METRIC:
	294	{
	295	m_logicalScaleX = mm2pixelsX;
	296	m_logicalScaleY = mm2pixelsY;
	297	break;
	298	}
	299	case wxMM_LOMETRIC:
	300	{
	301	m_logicalScaleX = (float)(mm2pixelsX/10.0);
	302	m_logicalScaleY = (float)(mm2pixelsY/10.0);
	303	break;
	304	}
	305	default:
	306	case wxMM_TEXT:
	307	{
	308	m_logicalScaleX = 1.0;
	309	m_logicalScaleY = 1.0;
	310	break;
	311	}
	312	}
	313	}
	314
	315	// ----------------------------------------------------------------------------
	316	// wxMakeMetafilePlaceable
	317	// ----------------------------------------------------------------------------
	318
	319	#ifdef __WIN32__
	320	struct RECT32
	321	{
	322	short left;
	323	short top;
	324	short right;
	325	short bottom;
	326	};
	327
	328	struct mfPLACEABLEHEADER {
	329	DWORD key;
	330	short hmf;
	331	RECT32 bbox;
	332	WORD inch;
	333	DWORD reserved;
	334	WORD checksum;
	335	};
	336	#else
	337	struct mfPLACEABLEHEADER {
	338	DWORD key;
	339	HANDLE hmf;
	340	RECT bbox;
	341	WORD inch;
	342	DWORD reserved;
	343	WORD checksum;
	344	};
	345	#endif
	346
	347	/*
	348	* Pass filename of existing non-placeable metafile, and bounding box.
	349	* Adds a placeable metafile header, sets the mapping mode to anisotropic,
	350	* and sets the window origin and extent to mimic the wxMM_TEXT mapping mode.
	351	*
	352	*/
	353
	354	bool wxMakeMetafilePlaceable(const wxString& filename, float scale)
	355	{
	356	return wxMakeMetafilePlaceable(filename, 0, 0, 0, 0, scale, false);
	357	}
	358
	359	bool wxMakeMetafilePlaceable(const wxString& filename, int x1, int y1, int x2, int y2, float scale, bool useOriginAndExtent)
	360	{
	361	// I'm not sure if this is the correct way of suggesting a scale
	362	// to the client application, but it's the only way I can find.
	363	int unitsPerInch = (int)(576/scale);
	364
	365	mfPLACEABLEHEADER header;
	366	header.key = 0x9AC6CDD7L;
	367	header.hmf = 0;
	368	header.bbox.left = (int)(x1);
	369	header.bbox.top = (int)(y1);
	370	header.bbox.right = (int)(x2);
	371	header.bbox.bottom = (int)(y2);
	372	header.inch = unitsPerInch;
	373	header.reserved = 0;
	374
	375	// Calculate checksum
	376	WORD *p;
	377	mfPLACEABLEHEADER *pMFHead = &header;
	378	for (p =(WORD *)pMFHead,pMFHead -> checksum = 0;
	379	p < (WORD *)&pMFHead ->checksum; ++p)
	380	pMFHead ->checksum ^= *p;
	381
	382	FILE *fd = wxFopen(filename.fn_str(), _T("rb"));
	383	if (!fd) return false;
	384
	385	wxChar tempFileBuf[256];
	386	wxGetTempFileName(wxT("mf"), tempFileBuf);
	387	FILE *fHandle = wxFopen(wxFNCONV(tempFileBuf), _T("wb"));
	388	if (!fHandle)
	389	return false;
	390	fwrite((void *)&header, sizeof(unsigned char), sizeof(mfPLACEABLEHEADER), fHandle);
	391
	392	// Calculate origin and extent
	393	int originX = x1;
	394	int originY = y1;
	395	int extentX = x2 - x1;
	396	int extentY = (y2 - y1);
	397
	398	// Read metafile header and write
	399	METAHEADER metaHeader;
	400	fread((void *)&metaHeader, sizeof(unsigned char), sizeof(metaHeader), fd);
	401
	402	if (useOriginAndExtent)
	403	metaHeader.mtSize += 15;
	404	else
	405	metaHeader.mtSize += 5;
	406
	407	fwrite((void *)&metaHeader, sizeof(unsigned char), sizeof(metaHeader), fHandle);
	408
	409	// Write SetMapMode, SetWindowOrigin and SetWindowExt records
	410	char modeBuffer[8];
	411	char originBuffer[10];
	412	char extentBuffer[10];
	413	METARECORD modeRecord = (METARECORD )&modeBuffer;
	414
	415	METARECORD originRecord = (METARECORD )&originBuffer;
	416	METARECORD extentRecord = (METARECORD )&extentBuffer;
	417
	418	modeRecord->rdSize = 4;
	419	modeRecord->rdFunction = META_SETMAPMODE;
	420	modeRecord->rdParm[0] = MM_ANISOTROPIC;
	421
	422	originRecord->rdSize = 5;
	423	originRecord->rdFunction = META_SETWINDOWORG;
	424	originRecord->rdParm[0] = originY;
	425	originRecord->rdParm[1] = originX;
	426
	427	extentRecord->rdSize = 5;
	428	extentRecord->rdFunction = META_SETWINDOWEXT;
	429	extentRecord->rdParm[0] = extentY;
	430	extentRecord->rdParm[1] = extentX;
	431
	432	fwrite((void *)modeBuffer, sizeof(char), 8, fHandle);
	433
	434	if (useOriginAndExtent)
	435	{
	436	fwrite((void *)originBuffer, sizeof(char), 10, fHandle);
	437	fwrite((void *)extentBuffer, sizeof(char), 10, fHandle);
	438	}
	439
	440	int ch = -2;
	441	while (ch != EOF)
	442	{
	443	ch = getc(fd);
	444	if (ch != EOF)
	445	{
	446	putc(ch, fHandle);
	447	}
	448	}
	449	fclose(fHandle);
	450	fclose(fd);
	451	wxRemoveFile(filename);
	452	wxCopyFile(tempFileBuf, filename);
	453	wxRemoveFile(tempFileBuf);
	454	return true;
	455	}
	456
	457
	458	#if wxUSE_DRAG_AND_DROP
	459
	460	// ----------------------------------------------------------------------------
	461	// wxMetafileDataObject
	462	// ----------------------------------------------------------------------------
	463
	464	size_t wxMetafileDataObject::GetDataSize() const
	465	{
	466	return sizeof(METAFILEPICT);
	467	}
	468
	469	bool wxMetafileDataObject::GetDataHere(void *buf) const
	470	{
	471	METAFILEPICT mfpict = (METAFILEPICT )buf;
	472	const wxMetafile& mf = GetMetafile();
	473
	474	wxCHECK_MSG( mf.GetHMETAFILE(), false, _T("copying invalid metafile") );
	475
	476	// doesn't seem to work with any other mapping mode...
	477	mfpict->mm = MM_ANISOTROPIC; //mf.GetWindowsMappingMode();
	478	mfpict->xExt = mf.GetWidth();
	479	mfpict->yExt = mf.GetHeight();
	480
	481	// transform the picture size to HIMETRIC units (0.01mm) - as we don't know
	482	// what DC the picture will be rendered to, use the default display one
	483	PixelToHIMETRIC(&mfpict->xExt, &mfpict->yExt);
	484
	485	mfpict->hMF = CopyMetaFile((HMETAFILE)mf.GetHMETAFILE(), NULL);
	486
	487	return true;
	488	}
	489
	490	bool wxMetafileDataObject::SetData(size_t WXUNUSED(len), const void *buf)
	491	{
	492	const METAFILEPICT mfpict = (const METAFILEPICT )buf;
	493
	494	wxMetafile mf;
	495	mf.SetWindowsMappingMode(mfpict->mm);
	496
	497	LONG w = mfpict->xExt,
	498	h = mfpict->yExt;
	499	if ( mfpict->mm == MM_ANISOTROPIC )
	500	{
	501	// in this case xExt and yExt contain suggested size in HIMETRIC units
	502	// (0.01 mm) - transform this to something more reasonable (pixels)
	503	HIMETRICToPixel(&w, &h);
	504	}
	505
	506	mf.SetWidth(w);
	507	mf.SetHeight(h);
	508	mf.SetHMETAFILE((WXHANDLE)mfpict->hMF);
	509
	510	wxCHECK_MSG( mfpict->hMF, false, _T("pasting invalid metafile") );
	511
	512	SetMetafile(mf);
	513
	514	return true;
	515	}
	516
	517	#endif // wxUSE_DRAG_AND_DROP
	518
	519	#endif // wxUSE_METAFILE