X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/f4322df68b099e5e983acc0a3dad4ad5841b57b5..79d81c45ca3e1b6c6d0c8712986e0b3ab42ad28f:/src/msw/printwin.cpp

diff --git a/src/msw/printwin.cpp b/src/msw/printwin.cpp
index 975a0936fd..587a4749fc 100644
--- a/src/msw/printwin.cpp
+++ b/src/msw/printwin.cpp
@@ -39,11 +39,17 @@
     #include "wx/intl.h"
     #include "wx/log.h"
     #include "wx/dcprint.h"
+    #include "wx/dcmemory.h"
+    #include "wx/image.h"
 #endif
 
+#include "wx/msw/dib.h"
+#include "wx/msw/dcmemory.h"
 #include "wx/msw/printwin.h"
 #include "wx/msw/printdlg.h"
 #include "wx/msw/private.h"
+#include "wx/msw/dcprint.h"
+#include "wx/msw/enhmeta.h"
 
 #include <stdlib.h>
 
@@ -75,7 +81,7 @@ LONG APIENTRY _EXPORT wxAbortProc(HDC hPr, int Code);
 wxWindowsPrinter::wxWindowsPrinter(wxPrintDialogData *data)
                 : wxPrinterBase(data)
 {
-    m_lpAbortProc = (WXFARPROC) MakeProcInstance((FARPROC) wxAbortProc, wxGetInstance());
+    m_lpAbortProc = (WXFARPROC)wxAbortProc;
 }
 
 wxWindowsPrinter::~wxWindowsPrinter()
@@ -119,19 +125,21 @@ bool wxWindowsPrinter::Print(wxWindow *parent, wxPrintout *printout, bool prompt
     }
 
     // May have pressed cancel.
-    if (!dc || !dc->Ok())
+    if (!dc || !dc->IsOk())
     {
         if (dc) delete dc;
         return false;
     }
 
+    wxPrinterDCImpl *impl = (wxPrinterDCImpl*) dc->GetImpl();
+
     HDC hdc = ::GetDC(NULL);
     int logPPIScreenX = ::GetDeviceCaps(hdc, LOGPIXELSX);
     int logPPIScreenY = ::GetDeviceCaps(hdc, LOGPIXELSY);
     ::ReleaseDC(NULL, hdc);
 
-    int logPPIPrinterX = ::GetDeviceCaps((HDC) dc->GetHDC(), LOGPIXELSX);
-    int logPPIPrinterY = ::GetDeviceCaps((HDC) dc->GetHDC(), LOGPIXELSY);
+    int logPPIPrinterX = ::GetDeviceCaps((HDC) impl->GetHDC(), LOGPIXELSX);
+    int logPPIPrinterY = ::GetDeviceCaps((HDC) impl->GetHDC(), LOGPIXELSY);
     if (logPPIPrinterX == 0 || logPPIPrinterY == 0)
     {
         delete dc;
@@ -177,14 +185,14 @@ bool wxWindowsPrinter::Print(wxWindow *parent, wxPrintout *printout, bool prompt
     wxWindow *win = CreateAbortWindow(parent, printout);
     wxYield();
 
-#if defined(__WATCOMC__) || defined(__BORLANDC__) || defined(__GNUWIN32__) || defined(__SALFORDC__) || !defined(__WIN32__)
+#if defined(__WATCOMC__) || defined(__BORLANDC__) || defined(__GNUWIN32__) || !defined(__WIN32__)
 #ifdef STRICT
-    ::SetAbortProc((HDC) dc->GetHDC(), (ABORTPROC) m_lpAbortProc);
+    ::SetAbortProc((HDC) impl->GetHDC(), (ABORTPROC) m_lpAbortProc);
 #else
-    ::SetAbortProc((HDC) dc->GetHDC(), (FARPROC) m_lpAbortProc);
+    ::SetAbortProc((HDC) impl->GetHDC(), (FARPROC) m_lpAbortProc);
 #endif
 #else
-    ::SetAbortProc((HDC) dc->GetHDC(), (int (_stdcall *)
+    ::SetAbortProc((HDC) impl->GetHDC(), (int (_stdcall *)
         // cast it to right type only if required
         // FIXME it's really cdecl and we're casting it to stdcall - either there is
         //       something I don't understand or it will crash at first usage
@@ -279,7 +287,7 @@ bool wxWindowsPrinter::Print(wxWindow *parent, wxPrintout *printout, bool prompt
 
 wxDC *wxWindowsPrinter::PrintDialog(wxWindow *parent)
 {
-    wxDC *dc = (wxPrinterDC*) NULL;
+    wxDC *dc = NULL;
 
     wxWindowsPrintDialog dialog(parent, & m_printDialogData);
     int ret = dialog.ShowModal();
@@ -370,9 +378,10 @@ void wxWindowsPrintPreview::DetermineScaling()
 
     wxRect paperRect;
 
-    if ( printerDC.Ok() )
+    if ( printerDC.IsOk() )
     {
-        HDC dc = GetHdcOf(printerDC);
+        wxPrinterDCImpl *impl = (wxPrinterDCImpl*) printerDC.GetImpl();
+        HDC dc = GetHdcOf(*impl);
         printerWidthMM = ::GetDeviceCaps(dc, HORZSIZE);
         printerHeightMM = ::GetDeviceCaps(dc, VERTSIZE);
         printerXRes = ::GetDeviceCaps(dc, HORZRES);
@@ -415,6 +424,53 @@ void wxWindowsPrintPreview::DetermineScaling()
     m_previewScaleY = float(logPPIScreenY) / logPPIPrinterY;
 }
 
+bool wxWindowsPrintPreview::RenderPageIntoBitmap(wxBitmap& bmp, int pageNum)
+{
+    // The preview, as implemented in wxPrintPreviewBase (and as used prior to
+    // wx3) is inexact: it uses screen DC, which has much lower resolution and
+    // has other properties different from printer DC, so the preview is not
+    // quite right.
+    //
+    // To make matters worse, if the application depends heavily on
+    // GetTextExtent() or does text layout itself, the output in preview and on
+    // paper can be very different. In particular, wxHtmlEasyPrinting is
+    // affected and the preview can be easily off by several pages.
+    //
+    // To fix this, we render the preview into high-resolution enhanced
+    // metafile with properties identical to the printer DC. This guarantees
+    // metrics correctness while still being fast.
+
+
+    // print the preview into a metafile:
+    wxPrinterDC printerDC(m_printDialogData.GetPrintData());
+    wxEnhMetaFileDC metaDC(printerDC,
+                           wxEmptyString,
+                           printerDC.GetSize().x, printerDC.GetSize().y);
+
+    if ( !RenderPageIntoDC(metaDC, pageNum) )
+        return false;
+
+    wxEnhMetaFile *metafile = metaDC.Close();
+    if ( !metafile )
+        return false;
+
+    // now render the metafile:
+    wxMemoryDC bmpDC;
+    bmpDC.SelectObject(bmp);
+    bmpDC.Clear();
+
+    wxRect outRect(0, 0, bmp.GetWidth(), bmp.GetHeight());
+    metafile->Play(&bmpDC, &outRect);
+
+
+    delete metafile;
+
+    // TODO: we should keep the metafile and reuse it when changing zoom level
+
+    return true;
+}
+
+
 /****************************************************************************
 
   FUNCTION: wxAbortProc()