]> git.saurik.com Git - wxWidgets.git/blobdiff - src/msw/dcprint.cpp
added (wxMSW-only) wxToolTip::SetMaxWidth() and improve its default behaviour (#2817)
[wxWidgets.git] / src / msw / dcprint.cpp
index ed38d9fe6479936e9264a6f2e2c6290cd00dda69..dfa9d3e656c0f81799343daaa3321b98922b9a35 100644 (file)
@@ -5,7 +5,7 @@
 // Modified by:
 // Created:     01/02/97
 // RCS-ID:      $Id$
-// Copyright:   (c) Julian Smart and Markus Holzem
+// Copyright:   (c) Julian Smart
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
 // headers
 // ----------------------------------------------------------------------------
 
-#ifdef __GNUG__
-    #pragma implementation "dcprint.h"
-#endif
-
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
     #pragma hdrstop
 #endif
 
+#if wxUSE_PRINTING_ARCHITECTURE
+
+#include "wx/dcprint.h"
+#include "wx/msw/dcprint.h"
+
 #ifndef WX_PRECOMP
+    #include "wx/msw/wrapcdlg.h"
     #include "wx/string.h"
     #include "wx/log.h"
     #include "wx/window.h"
     #include "wx/dcmemory.h"
+    #include "wx/math.h"
 #endif
 
-#if wxUSE_PRINTING_ARCHITECTURE
-
 #include "wx/msw/private.h"
-#include "wx/dcprint.h"
-#include "math.h"
 
-#if wxUSE_COMMON_DIALOGS || defined(__WXWINE__)
-    #include <commdlg.h>
+#if wxUSE_WXDIB
+    #include "wx/msw/dib.h"
 #endif
 
+#include "wx/printdlg.h"
+#include "wx/msw/printdlg.h"
+
 #ifndef __WIN32__
     #include <print.h>
 #endif
 
 // mingw32 defines GDI_ERROR incorrectly
-#ifdef __GNUWIN32__
+#if defined(__GNUWIN32__) || !defined(GDI_ERROR)
     #undef GDI_ERROR
     #define GDI_ERROR ((int)-1)
 #endif
 
+#if defined(__WXUNIVERSAL__) && wxUSE_POSTSCRIPT_ARCHITECTURE_IN_MSW
+    #define wxUSE_PS_PRINTING 1
+#else
+    #define wxUSE_PS_PRINTING 0
+#endif
+
 // ----------------------------------------------------------------------------
 // wxWin macros
 // ----------------------------------------------------------------------------
 
-IMPLEMENT_CLASS(wxPrinterDC, wxDC)
+IMPLEMENT_ABSTRACT_CLASS(wxPrinterDCImpl, wxMSWDCImpl)
 
 // ============================================================================
 // implementation
@@ -69,6 +77,7 @@ IMPLEMENT_CLASS(wxPrinterDC, wxDC)
 // wxPrinterDC construction
 // ----------------------------------------------------------------------------
 
+#if 0
 // This form is deprecated
 wxPrinterDC::wxPrinterDC(const wxString& driver_name,
                          const wxString& device_name,
@@ -109,7 +118,10 @@ wxPrinterDC::wxPrinterDC(const wxString& driver_name,
     {
         if ( !driver_name.empty() && !device_name.empty() && !file.empty() )
         {
-            m_hDC = (WXHDC) CreateDC(driver_name, device_name, file, NULL);
+            m_hDC = (WXHDC) CreateDC(driver_name.wx_str(),
+                                     device_name.wx_str(),
+                                     file.fn_str(),
+                                     NULL);
         }
         else // we don't have all parameters, ask the user
         {
@@ -118,39 +130,42 @@ wxPrinterDC::wxPrinterDC(const wxString& driver_name,
             m_hDC = wxGetPrinterDC(printData);
         }
 
-        m_ok = m_hDC ? TRUE: FALSE;
+        m_ok = m_hDC ? true: false;
 
         // as we created it, we must delete it as well
-        m_bOwnsDC = TRUE;
+        m_bOwnsDC = true;
     }
 
     Init();
 }
+#endif
 
-wxPrinterDC::wxPrinterDC(const wxPrintData& printData)
+wxPrinterDCImpl::wxPrinterDCImpl( wxPrinterDC *owner, const wxPrintData& printData ) :
+    wxMSWDCImpl( owner )
 {
     m_printData = printData;
 
-    m_isInteractive = FALSE;
+    m_isInteractive = false;
 
     m_hDC = wxGetPrinterDC(printData);
     m_ok = m_hDC != 0;
-    m_bOwnsDC = TRUE;
+    m_bOwnsDC = true;
 
     Init();
 }
 
 
-wxPrinterDC::wxPrinterDC(WXHDC dc)
+wxPrinterDCImpl::wxPrinterDCImpl( wxPrinterDC *owner, WXHDC dc ) :
+    wxMSWDCImpl( owner )
 {
-    m_isInteractive = FALSE;
+    m_isInteractive = false;
 
     m_hDC = dc;
-    m_bOwnsDC = TRUE;
-    m_ok = TRUE;
+    m_bOwnsDC = true;
+    m_ok = true;
 }
 
-void wxPrinterDC::Init()
+void wxPrinterDCImpl::Init()
 {
     if ( m_hDC )
     {
@@ -164,67 +179,75 @@ void wxPrinterDC::Init()
 }
 
 // ----------------------------------------------------------------------------
-// wxPrinterDC {Start/End}{Page/Doc} methods
+// wxPrinterDCImpl {Start/End}{Page/Doc} methods
 // ----------------------------------------------------------------------------
 
-bool wxPrinterDC::StartDoc(const wxString& message)
+bool wxPrinterDCImpl::StartDoc(const wxString& message)
 {
     DOCINFO docinfo;
     docinfo.cbSize = sizeof(DOCINFO);
-    docinfo.lpszDocName = (const wxChar*)message;
+    docinfo.lpszDocName = message.wx_str();
 
     wxString filename(m_printData.GetFilename());
 
-    if (filename.IsEmpty())
+    if (filename.empty())
         docinfo.lpszOutput = NULL;
     else
-        docinfo.lpszOutput = (const wxChar *) filename;
+        docinfo.lpszOutput = filename.wx_str();
 
-#if defined(__WIN95__)
     docinfo.lpszDatatype = NULL;
     docinfo.fwType = 0;
-#endif
 
     if (!m_hDC)
-        return FALSE;
+        return false;
 
-    int ret = ::StartDoc(GetHdc(), &docinfo);
-
-#ifndef __WIN16__
-    if (ret <= 0)
+    if ( ::StartDoc(GetHdc(), &docinfo) <= 0 )
     {
-        DWORD lastError = GetLastError();
-        wxLogDebug(wxT("wxDC::StartDoc failed with error: %ld\n"), lastError);
+        wxLogLastError(wxT("StartDoc"));
+        return false;
     }
-#endif
 
-    return (ret > 0);
+    return true;
 }
 
-void wxPrinterDC::EndDoc()
+void wxPrinterDCImpl::EndDoc()
 {
     if (m_hDC) ::EndDoc((HDC) m_hDC);
 }
 
-void wxPrinterDC::StartPage()
+void wxPrinterDCImpl::StartPage()
 {
     if (m_hDC)
         ::StartPage((HDC) m_hDC);
 }
 
-void wxPrinterDC::EndPage()
+void wxPrinterDCImpl::EndPage()
 {
     if (m_hDC)
         ::EndPage((HDC) m_hDC);
 }
 
+
+wxRect wxPrinterDCImpl::GetPaperRect() const
+
+{
+    if (!IsOk()) return wxRect(0, 0, 0, 0);
+    int w = ::GetDeviceCaps((HDC) m_hDC, PHYSICALWIDTH);
+    int h = ::GetDeviceCaps((HDC) m_hDC, PHYSICALHEIGHT);
+    int x = -::GetDeviceCaps((HDC) m_hDC, PHYSICALOFFSETX);
+    int y = -::GetDeviceCaps((HDC) m_hDC, PHYSICALOFFSETY);
+    return wxRect(x, y, w, h);
+}
+
+
+#if !wxUSE_PS_PRINTING
+
 // Returns default device and port names
 static bool wxGetDefaultDeviceName(wxString& deviceName, wxString& portName)
 {
     deviceName.clear();
 
     LPDEVNAMES  lpDevNames;
-    LPTSTR      lpszDriverName;
     LPTSTR      lpszDeviceName;
     LPTSTR      lpszPortName;
 
@@ -252,13 +275,12 @@ static bool wxGetDefaultDeviceName(wxString& deviceName, wxString& portName)
         if (pd.hDevNames)
             GlobalFree(pd.hDevNames);
 
-        return FALSE;
+        return false;
     }
 
     if (pd.hDevNames)
     {
         lpDevNames = (LPDEVNAMES)GlobalLock(pd.hDevNames);
-        lpszDriverName = (LPTSTR)lpDevNames + lpDevNames->wDriverOffset;
         lpszDeviceName = (LPTSTR)lpDevNames + lpDevNames->wDeviceOffset;
         lpszPortName   = (LPTSTR)lpDevNames + lpDevNames->wOutputOffset;
 
@@ -275,152 +297,105 @@ static bool wxGetDefaultDeviceName(wxString& deviceName, wxString& portName)
         GlobalFree(pd.hDevMode);
         pd.hDevMode=NULL;
     }
-    return ( deviceName != wxT("") );
+    return ( !deviceName.empty() );
 }
 
-#if 0
-// This uses defaults, except for orientation, so we should eliminate this function
-// and use the 2nd form (passing wxPrintData) instead.
-WXHDC wxGetPrinterDC(int orientation)
-{
-    HDC         hDC;
-    LPDEVMODE   lpDevMode = NULL;
-    LPDEVNAMES  lpDevNames;
-    LPSTR       lpszDriverName;
-    LPSTR       lpszDeviceName;
-    LPSTR       lpszPortName;
+#endif // !wxUSE_PS_PRINTING
 
-    PRINTDLG    pd;
-    // __GNUWIN32__ has trouble believing PRINTDLG is 66 bytes - thinks it is 68
-#ifdef __GNUWIN32__
-    pd.lStructSize    = 66; // sizeof(PRINTDLG);
-#else
-    pd.lStructSize    = sizeof(PRINTDLG);
-#endif
-    pd.hwndOwner      = (HWND)NULL;
-    pd.hDevMode       = NULL; // Will be created by PrintDlg
-    pd.hDevNames      = NULL; // Ditto
-    pd.Flags          = PD_RETURNDEFAULT;
-    pd.nCopies        = 1;
-
-    if (!PrintDlg((LPPRINTDLG)&pd))
-    {
-        if ( pd.hDevMode )
-            GlobalFree(pd.hDevMode);
-        if (pd.hDevNames)
-            GlobalFree(pd.hDevNames);
-
-        return(0);
-    }
-
-    if (!pd.hDevNames)
+// Gets an HDC for the specified printer configuration
+WXHDC WXDLLEXPORT wxGetPrinterDC(const wxPrintData& printDataConst)
+{
+#if wxUSE_PS_PRINTING
+    // TODO
+    wxUnusedVar(printDataConst);
+    return 0;
+#else // native Windows printing
+    wxWindowsPrintNativeData *data =
+        (wxWindowsPrintNativeData *) printDataConst.GetNativeData();
+
+    data->TransferFrom( printDataConst );
+
+    wxString deviceName = printDataConst.GetPrinterName();
+    if ( deviceName.empty() )
     {
-        if ( pd.hDevMode )
-            GlobalFree(pd.hDevMode);
+        // Retrieve the default device name
+        wxString portName;
+        if ( !wxGetDefaultDeviceName(deviceName, portName) )
+        {
+            return 0; // Could not get default device name
+        }
     }
 
-    lpDevNames = (LPDEVNAMES)GlobalLock(pd.hDevNames);
-    lpszDriverName = (LPSTR)lpDevNames + lpDevNames->wDriverOffset;
-    lpszDeviceName = (LPSTR)lpDevNames + lpDevNames->wDeviceOffset;
-    lpszPortName   = (LPSTR)lpDevNames + lpDevNames->wOutputOffset;
-    GlobalUnlock(pd.hDevNames);
-
-    if ( pd.hDevMode )
-    {
-        lpDevMode = (DEVMODE*) GlobalLock(pd.hDevMode);
-        lpDevMode->dmOrientation = orientation;
-        lpDevMode->dmFields |= DM_ORIENTATION;
-    }
 
-#ifdef __WIN32__
-    hDC = CreateDC(lpszDriverName, lpszDeviceName, lpszPortName, (DEVMODE *)lpDevMode);
-#else
-    hDC = CreateDC(lpszDriverName, lpszDeviceName, lpszPortName, (LPSTR)lpDevMode);
-#endif
+    GlobalPtrLock lockDevMode;
+    const HGLOBAL devMode = data->GetDevMode();
+    if ( devMode )
+        lockDevMode.Init(devMode);
 
-    if (pd.hDevMode && lpDevMode)
-        GlobalUnlock(pd.hDevMode);
+    HDC hDC = ::CreateDC
+                (
+                    NULL,               // no driver name as we use device name
+                    deviceName.wx_str(),
+                    NULL,               // unused
+                    static_cast<DEVMODE *>(lockDevMode.Get())
+                );
+    if ( !hDC )
+        wxLogLastError(_T("CreateDC(printer)"));
 
-    if (pd.hDevNames)
-    {
-        GlobalFree(pd.hDevNames);
-        pd.hDevNames=NULL;
-    }
-    if (pd.hDevMode)
-    {
-        GlobalFree(pd.hDevMode);
-        pd.hDevMode=NULL;
-    }
     return (WXHDC) hDC;
+#endif // PostScript/Windows printing
 }
-#endif // 0
-
-// Gets an HDC for the specified printer configuration
-WXHDC WXDLLEXPORT wxGetPrinterDC(const wxPrintData& printDataConst)
-{
-    wxPrintData printData = printDataConst;
-    printData.ConvertToNative();
-
-    wxChar* driverName = (wxChar*) NULL;
-
-    wxString devNameStr = printData.GetPrinterName();
-    wxChar* portName = (wxChar*) NULL; // Obsolete in WIN32
-
-    const wxChar* deviceName;
-    if ( !devNameStr )
-        deviceName = (wxChar*) NULL;
-    else
-        deviceName = devNameStr.c_str();
 
-    LPDEVMODE lpDevMode = (LPDEVMODE) NULL;
+// ----------------------------------------------------------------------------
+// wxPrinterDCImpl bit blitting/bitmap drawing
+// ----------------------------------------------------------------------------
 
-    HGLOBAL hDevMode = (HGLOBAL)(DWORD) printData.GetNativeData();
+// helper of DoDrawBitmap() and DoBlit()
+static
+bool DrawBitmapUsingStretchDIBits(HDC hdc,
+                                  const wxBitmap& bmp,
+                                  wxCoord x, wxCoord y)
+{
+#if wxUSE_WXDIB
+    wxDIB dib(bmp);
+    bool ok = dib.IsOk();
+    if ( !ok )
+        return false;
+
+    DIBSECTION ds;
+    if ( !::GetObject(dib.GetHandle(), sizeof(ds), &ds) )
+    {
+        wxLogLastError(_T("GetObject(DIBSECTION)"));
 
-    if ( hDevMode )
-        lpDevMode = (DEVMODE*) GlobalLock(hDevMode);
+        return false;
+    }
 
-    if ( !devNameStr )
+    // ok, we've got all data we need, do blit it
+    if ( ::StretchDIBits
+            (
+                hdc,
+                x, y,
+                ds.dsBmih.biWidth, ds.dsBmih.biHeight,
+                0, 0,
+                ds.dsBmih.biWidth, ds.dsBmih.biHeight,
+                ds.dsBm.bmBits,
+                (LPBITMAPINFO)&ds.dsBmih,
+                DIB_RGB_COLORS,
+                SRCCOPY
+            ) == GDI_ERROR )
     {
-        // Retrieve the default device name
-        wxString portName;
-#ifdef  __WXDEBUG__
-        bool ret =
-#else   // !Debug
-        (void)
-#endif // Debug/Release
-        wxGetDefaultDeviceName(devNameStr, portName);
+        wxLogLastError(wxT("StretchDIBits"));
 
-        wxASSERT_MSG( ret, wxT("Could not get default device name.") );
-
-        deviceName = devNameStr.c_str();
+        return false;
     }
 
-#ifdef __WIN32__
-    HDC hDC = CreateDC(driverName, deviceName, portName, (DEVMODE *) lpDevMode);
+    return true;
 #else
-    HDC hDC = CreateDC(driverName, deviceName, portName, (LPSTR) lpDevMode);
+    return false;
 #endif
-
-    if (hDevMode && lpDevMode)
-        GlobalUnlock(hDevMode);
-
-    return (WXHDC) hDC;
 }
 
-// ----------------------------------------------------------------------------
-// wxPrinterDC bit blitting/bitmap drawing
-// ----------------------------------------------------------------------------
-
-// Win16 doesn't define GDI_ERROR.
-#ifndef GDI_ERROR
-#define GDI_ERROR -1
-#endif
-
-// Just in case we want to go back to using 8 bits for
-// any reason: set this to 0 for 8 bits.
-#define wxUSE_DRAWBITMAP_24BITS 1
-
-void wxPrinterDC::DoDrawBitmap(const wxBitmap &bmp,
+void wxPrinterDCImpl::DoDrawBitmap(const wxBitmap& bmp,
                                wxCoord x, wxCoord y,
                                bool useMask)
 {
@@ -429,86 +404,51 @@ void wxPrinterDC::DoDrawBitmap(const wxBitmap &bmp,
     int width = bmp.GetWidth(),
         height = bmp.GetHeight();
 
-    if ( ::GetDeviceCaps(GetHdc(), RASTERCAPS) & RC_STRETCHDIB )
-    {
-        BITMAPINFO *info = (BITMAPINFO *) malloc( sizeof( BITMAPINFOHEADER ) + 256 * sizeof(RGBQUAD ) );
-        memset( info, 0, sizeof( BITMAPINFOHEADER ) );
-
-#if wxUSE_DRAWBITMAP_24BITS
-        int iBitsSize = ((width + 3 ) & ~3 ) * height * 3;
-#else
-        int iBitsSize = ((width + 3 ) & ~3 ) * height ;
-#endif
-
-        void* bits = malloc( iBitsSize );
-
-        info->bmiHeader.biSize = sizeof( BITMAPINFOHEADER );
-        info->bmiHeader.biWidth = width;
-        info->bmiHeader.biHeight = height;
-        info->bmiHeader.biPlanes = 1;
-#if wxUSE_DRAWBITMAP_24BITS
-        info->bmiHeader.biBitCount = 24;
-#else
-        info->bmiHeader.biBitCount = 8;
-#endif        
-        info->bmiHeader.biCompression = BI_RGB;
-
-        ScreenHDC display;
-        if ( GetDIBits(display, GetHbitmapOf(bmp), 0,
-                       bmp.GetHeight(), bits, info,
-                       DIB_RGB_COLORS) )
-        {
-            if ( ::StretchDIBits(GetHdc(), x, y,
-                                 width, height,
-                                 0 , 0, width, height,
-                                 bits, info,
-                                 DIB_RGB_COLORS, SRCCOPY) == GDI_ERROR )
-            {
-                wxLogLastError(wxT("StretchDIBits"));
-            }
-        }
-
-        free(bits);
-        free(info);
-    }
-    else // no support for StretchDIBits()
+    if ( !(::GetDeviceCaps(GetHdc(), RASTERCAPS) & RC_STRETCHDIB) ||
+            !DrawBitmapUsingStretchDIBits(GetHdc(), bmp, x, y) )
     {
+        // no support for StretchDIBits() or an error occurred if we got here
         wxMemoryDC memDC;
-        memDC.SelectObject(bmp);
 
-        Blit(x, y, width, height, &memDC, 0, 0, wxCOPY, useMask);
+        memDC.SelectObjectAsSource(bmp);
+
+        GetOwner()->Blit(x, y, width, height, &memDC, 0, 0, wxCOPY, useMask);
 
         memDC.SelectObject(wxNullBitmap);
     }
 }
 
-bool wxPrinterDC::DoBlit(wxCoord xdest, wxCoord ydest,
+bool wxPrinterDCImpl::DoBlit(wxCoord xdest, wxCoord ydest,
                          wxCoord width, wxCoord height,
                          wxDC *source,
-                         wxCoord xsrc, wxCoord ysrc,
-                         int WXUNUSED(rop), bool useMask,
+                         wxCoord WXUNUSED(xsrc), wxCoord WXUNUSED(ysrc),
+                         wxRasterOperationMode WXUNUSED(rop), bool useMask,
                          wxCoord WXUNUSED(xsrcMask), wxCoord WXUNUSED(ysrcMask))
 {
-    bool success = TRUE;
-
-    if ( useMask )
+    wxDCImpl *impl = source->GetImpl();
+    wxMSWDCImpl *msw_impl = wxDynamicCast(impl, wxMSWDCImpl);
+    if (!msw_impl)
+        return false;
+
+    wxBitmap& bmp = msw_impl->GetSelectedBitmap();
+    wxMask *mask = useMask ? bmp.GetMask() : NULL;
+    if ( mask )
     {
-        // If we are printing source colours are screen colours
-        // not printer colours and so we need copy the bitmap
-        // pixel by pixel.
+        // If we are printing source colours are screen colours not printer
+        // colours and so we need copy the bitmap pixel by pixel.
         RECT rect;
-        HDC dc_src = GetHdcOf(*source);
-        HDC dc_mask = ::CreateCompatibleDC(dc_src);
+        HDC dcSrc = GetHdcOf(*msw_impl);
+        MemoryHDC dcMask(dcSrc);
+        SelectInHDC selectMask(dcMask, (HBITMAP)mask->GetMaskBitmap());
 
-        ::SelectObject(dc_mask, (HBITMAP) source->GetSelectedBitmap().GetMask()->GetMaskBitmap());
         for (int x = 0; x < width; x++)
         {
             for (int y = 0; y < height; y++)
             {
-                COLORREF cref = ::GetPixel(dc_mask, x, y);
+                COLORREF cref = ::GetPixel(dcMask, x, y);
                 if (cref)
                 {
-                    HBRUSH brush = ::CreateSolidBrush(::GetPixel(dc_src, x, y));
+                    HBRUSH brush = ::CreateSolidBrush(::GetPixel(dcSrc, x, y));
                     rect.left = xdest + x;
                     rect.right = rect.left + 1;
                     rect.top = ydest + y;
@@ -518,76 +458,30 @@ bool wxPrinterDC::DoBlit(wxCoord xdest, wxCoord ydest,
                 }
             }
         }
-        ::SelectObject(dc_mask, 0);
-        ::DeleteDC(dc_mask);
     }
     else // no mask
     {
-        if ( ::GetDeviceCaps(GetHdc(), RASTERCAPS) & RC_STRETCHDIB )
+        if ( !(::GetDeviceCaps(GetHdc(), RASTERCAPS) & RC_STRETCHDIB) ||
+                !DrawBitmapUsingStretchDIBits(GetHdc(), bmp, xdest, ydest) )
         {
-            wxBitmap& bmp = source->GetSelectedBitmap();
-            int width = bmp.GetWidth(),
-                height = bmp.GetHeight();
-
-            BITMAPINFO *info = (BITMAPINFO *) malloc( sizeof( BITMAPINFOHEADER ) + 256 * sizeof(RGBQUAD ) );
-            int iBitsSize = ((width + 3 ) & ~3 ) * height;
-
-            void* bits = malloc( iBitsSize );
-
-            memset( info , 0 , sizeof( BITMAPINFOHEADER ) );
-
-            info->bmiHeader.biSize = sizeof( BITMAPINFOHEADER );
-            info->bmiHeader.biWidth = width;
-            info->bmiHeader.biHeight = height;
-            info->bmiHeader.biPlanes = 1;
-            info->bmiHeader.biBitCount = 8;
-            info->bmiHeader.biCompression = BI_RGB;
-
-            ScreenHDC display;
-            if ( !::GetDIBits(display, GetHbitmapOf(bmp), 0,
-                              height, bits, info, DIB_RGB_COLORS) )
-            {
-                wxLogLastError(wxT("GetDIBits"));
-
-                success = FALSE;
-            }
-
-            if ( success )
-            {
-                success = ::StretchDIBits(GetHdc(), xdest, ydest,
-                                          width, height,
-                                          xsrc, ysrc,
-                                          width, height,
-                                          bits, info ,
-                                          DIB_RGB_COLORS,
-                                          SRCCOPY) != GDI_ERROR;
-                if ( !success )
-                {
-                    wxLogLastError(wxT("StretchDIBits"));
-                }
-            }
+            // no support for StretchDIBits
 
-            free(bits);
-            free(info);
-        }
-        else // no support for StretchDIBits
-        {
-            // as we are printing, source colours are screen colours not printer
-            // colours and so we need copy the bitmap pixel by pixel.
-            HDC dc_src = GetHdcOf(*source);
+            // as we are printing, source colours are screen colours not
+            // printer colours and so we need copy the bitmap pixel by pixel.
+            HDC dcSrc = GetHdcOf(*msw_impl);
             RECT rect;
             for (int y = 0; y < height; y++)
             {
-                // This is Stefan Csomor's optimisation, where identical adjacent
-                // pixels are drawn together.
+                // optimization: draw identical adjacent pixels together.
                 for (int x = 0; x < width; x++)
                 {
-                    COLORREF col = ::GetPixel(dc_src, x, y);
+                    COLORREF col = ::GetPixel(dcSrc, x, y);
                     HBRUSH brush = ::CreateSolidBrush( col );
 
                     rect.left = xdest + x;
                     rect.top = ydest + y;
-                    while( (x + 1 < width) && (::GetPixel(dc_src, x + 1, y) == col ) )
+                    while( (x + 1 < width) &&
+                                (::GetPixel(dcSrc, x + 1, y) == col ) )
                     {
                         ++x;
                     }
@@ -600,7 +494,7 @@ bool wxPrinterDC::DoBlit(wxCoord xdest, wxCoord ydest,
         }
     }
 
-    return success;
+    return true;
 }
 
 #endif