X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/ce3ed50dbe32d118321082db84c3a9abb047d5b7..79cb759dc8580da2e82e880cd94a08cd38bb814e:/src/msw/printwin.cpp diff --git a/src/msw/printwin.cpp b/src/msw/printwin.cpp index f66d48fde2..99f2892758 100644 --- a/src/msw/printwin.cpp +++ b/src/msw/printwin.cpp @@ -1,341 +1,728 @@ ///////////////////////////////////////////////////////////////////////////// -// Name: printwin.cpp +// Name: src/msw/printwin.cpp // Purpose: wxWindowsPrinter framework // Author: Julian Smart // Modified by: // Created: 04/01/98 // RCS-ID: $Id$ -// Copyright: (c) Julian Smart and Markus Holzem -// Licence: wxWindows license +// Copyright: (c) Julian Smart +// Licence: wxWindows licence ///////////////////////////////////////////////////////////////////////////// -#ifdef __GNUG__ -#pragma implementation "printwin.h" -#endif +// =========================================================================== +// declarations +// =========================================================================== + +// --------------------------------------------------------------------------- +// headers +// --------------------------------------------------------------------------- // For compilers that support precompilation, includes "wx.h". #include "wx/wxprec.h" #ifdef __BORLANDC__ -#pragma hdrstop + #pragma hdrstop #endif -#include "wx/defs.h" - -#define WINDOWS_PRINTING (wxTheApp->GetPrintMode() == wxPRINT_WINDOWS) +// Don't use the Windows printer if we're in wxUniv mode and using +// the PostScript architecture +#if wxUSE_PRINTING_ARCHITECTURE && (!defined(__WXUNIVERSAL__) || !wxUSE_POSTSCRIPT_ARCHITECTURE_IN_MSW) #ifndef WX_PRECOMP -#include "wx/utils.h" -#include "wx/dc.h" -#include "wx/app.h" -#include "wx/msgdlg.h" + #include "wx/msw/wrapcdlg.h" + #include "wx/window.h" + #include "wx/msw/private.h" + #include "wx/utils.h" + #include "wx/dc.h" + #include "wx/app.h" + #include "wx/msgdlg.h" + #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/dcprint.h" -#include "wx/printdlg.h" +#include "wx/msw/printdlg.h" #include "wx/msw/private.h" +#include "wx/msw/dcprint.h" #include -#include -#include - -// Clash with Windows header files -#ifdef StartDoc -#undef StartDoc -#endif #ifndef __WIN32__ -#include + #include #endif +// --------------------------------------------------------------------------- +// private functions +// --------------------------------------------------------------------------- + LONG APIENTRY _EXPORT wxAbortProc(HDC hPr, int Code); -#if !USE_SHARED_LIBRARY -IMPLEMENT_DYNAMIC_CLASS(wxWindowsPrinter, wxPrinterBase) -IMPLEMENT_CLASS(wxWindowsPrintPreview, wxPrintPreviewBase) -#endif +// --------------------------------------------------------------------------- +// wxWin macros +// --------------------------------------------------------------------------- -/* - * Printer - */ - -wxWindowsPrinter::wxWindowsPrinter(wxPrintData *data): - wxPrinterBase(data) + IMPLEMENT_DYNAMIC_CLASS(wxWindowsPrinter, wxPrinterBase) + IMPLEMENT_CLASS(wxWindowsPrintPreview, wxPrintPreviewBase) + +// =========================================================================== +// implementation +// =========================================================================== + +// --------------------------------------------------------------------------- +// Printer +// --------------------------------------------------------------------------- + +wxWindowsPrinter::wxWindowsPrinter(wxPrintDialogData *data) + : wxPrinterBase(data) { - m_lpAbortProc = (WXFARPROC) MakeProcInstance((FARPROC) wxAbortProc, wxGetInstance()); + m_lpAbortProc = (WXFARPROC)wxAbortProc; } -wxWindowsPrinter::~wxWindowsPrinter(void) +wxWindowsPrinter::~wxWindowsPrinter() { + // avoids warning about statement with no effect (FreeProcInstance + // doesn't do anything under Win32) +#if !defined(__WIN32__) && !defined(__NT__) FreeProcInstance((FARPROC) m_lpAbortProc); +#endif } bool wxWindowsPrinter::Print(wxWindow *parent, wxPrintout *printout, bool prompt) { - sm_abortIt = FALSE; - sm_abortWindow = NULL; - - if (!printout) - return FALSE; - - printout->SetIsPreview(FALSE); - printout->OnPreparePrinting(); - - // Get some parameters from the printout, if defined - int fromPage, toPage; - int minPage, maxPage; - printout->GetPageInfo(&minPage, &maxPage, &fromPage, &toPage); - - if (maxPage == 0) - return FALSE; - - m_printData.SetMinPage(minPage); - m_printData.SetMaxPage(maxPage); - if (fromPage != 0) - m_printData.SetFromPage(fromPage); - if (toPage != 0) - m_printData.SetToPage(toPage); - - if (minPage != 0) - { - m_printData.EnablePageNumbers(TRUE); - if (m_printData.GetFromPage() < m_printData.GetMinPage()) - m_printData.SetFromPage(m_printData.GetMinPage()); - else if (m_printData.GetFromPage() > m_printData.GetMaxPage()) - m_printData.SetFromPage(m_printData.GetMaxPage()); - if (m_printData.GetToPage() > m_printData.GetMaxPage()) - m_printData.SetToPage(m_printData.GetMaxPage()); - else if (m_printData.GetToPage() < m_printData.GetMinPage()) - m_printData.SetToPage(m_printData.GetMinPage()); - } - else - m_printData.EnablePageNumbers(FALSE); - - // Create a suitable device context - wxDC *dc = NULL; - if (prompt) - { - wxPrintDialog dialog(parent, & m_printData); - if (dialog.ShowModal() == wxID_OK) - { - dc = dialog.GetPrintDC(); - m_printData = dialog.GetPrintData(); - } - } - else - { - dc = new wxPrinterDC("", "", "", FALSE, m_printData.GetOrientation()); - } - - // May have pressed cancel. - if (!dc || !dc->Ok()) - { - if (dc) delete dc; - return FALSE; - } - - int logPPIScreenX = 0; - int logPPIScreenY = 0; - int logPPIPrinterX = 0; - int logPPIPrinterY = 0; - - HDC hdc = ::GetDC(NULL); - logPPIScreenX = ::GetDeviceCaps(hdc, LOGPIXELSX); - logPPIScreenY = ::GetDeviceCaps(hdc, LOGPIXELSY); - ::ReleaseDC(NULL, hdc); - - logPPIPrinterX = ::GetDeviceCaps((HDC) dc->GetHDC(), LOGPIXELSX); - logPPIPrinterY = ::GetDeviceCaps((HDC) dc->GetHDC(), LOGPIXELSY); - if (logPPIPrinterX == 0 || logPPIPrinterY == 0) - { - delete dc; - return FALSE; - } + sm_abortIt = false; + sm_abortWindow = NULL; + + if (!printout) + { + sm_lastError = wxPRINTER_ERROR; + return false; + } + + printout->SetIsPreview(false); + + if (m_printDialogData.GetMinPage() < 1) + m_printDialogData.SetMinPage(1); + if (m_printDialogData.GetMaxPage() < 1) + m_printDialogData.SetMaxPage(9999); - printout->SetPPIScreen(logPPIScreenX, logPPIScreenY); - printout->SetPPIPrinter(logPPIPrinterX, logPPIPrinterY); + // Create a suitable device context + wxPrinterDC *dc wxDUMMY_INITIALIZE(NULL); + if (prompt) + { + dc = wxDynamicCast(PrintDialog(parent), wxPrinterDC); + if (!dc) + return false; + } + else + { + dc = new wxPrinterDC(m_printDialogData.GetPrintData()); + } - // Set printout parameters - printout->SetDC(dc); + // May have pressed cancel. + 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 w, h; - long ww, hh; - dc->GetSize(&w, &h); - printout->SetPageSizePixels((int)w, (int)h); - dc->GetSizeMM(&ww, &hh); - printout->SetPageSizeMM((int)ww, (int)hh); + int logPPIPrinterX = ::GetDeviceCaps((HDC) impl->GetHDC(), LOGPIXELSX); + int logPPIPrinterY = ::GetDeviceCaps((HDC) impl->GetHDC(), LOGPIXELSY); + if (logPPIPrinterX == 0 || logPPIPrinterY == 0) + { + delete dc; + sm_lastError = wxPRINTER_ERROR; + return false; + } + + printout->SetPPIScreen(logPPIScreenX, logPPIScreenY); + printout->SetPPIPrinter(logPPIPrinterX, logPPIPrinterY); + + // Set printout parameters + printout->SetDC(dc); + + int w, h; + dc->GetSize(&w, &h); + printout->SetPageSizePixels((int)w, (int)h); + printout->SetPaperRectPixels(dc->GetPaperRect()); + + dc->GetSizeMM(&w, &h); + printout->SetPageSizeMM((int)w, (int)h); + + // Create an abort window + wxBusyCursor busyCursor; + + printout->OnPreparePrinting(); + + // Get some parameters from the printout, if defined + int fromPage, toPage; + int minPage, maxPage; + printout->GetPageInfo(&minPage, &maxPage, &fromPage, &toPage); + + if (maxPage == 0) + { + sm_lastError = wxPRINTER_ERROR; + return false; + } - // Create an abort window - wxBeginBusyCursor(); + // Only set min and max, because from and to have been + // set by the user + m_printDialogData.SetMinPage(minPage); + m_printDialogData.SetMaxPage(maxPage); - wxWindow *win = CreateAbortWindow(parent, printout); - wxYield(); + wxWindow *win = CreateAbortWindow(parent, printout); + wxYield(); -#if defined(__BORLANDC__) || defined(__GNUWIN32__) || defined(__SALFORDC__) || !defined(__WIN32__) - ::SetAbortProc((HDC) dc->GetHDC(), (FARPROC) m_lpAbortProc); +#if defined(__WATCOMC__) || defined(__BORLANDC__) || defined(__GNUWIN32__) || !defined(__WIN32__) +#ifdef STRICT + ::SetAbortProc((HDC) impl->GetHDC(), (ABORTPROC) m_lpAbortProc); #else - ::SetAbortProc((HDC) dc->GetHDC(), (int (_stdcall *) - // cast it to right type only if required - // @@@ 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 - #ifdef STRICT - (HDC, int) - #else - () - #endif - )m_lpAbortProc); + ::SetAbortProc((HDC) impl->GetHDC(), (FARPROC) m_lpAbortProc); +#endif +#else + ::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 +#ifdef STRICT + (HDC, int) +#else + () +#endif + )m_lpAbortProc); #endif - if (!win) - { - wxEndBusyCursor(); - wxMessageBox("Sorry, could not create an abort dialog.", "Print Error", wxOK, parent); - delete dc; - } - sm_abortWindow = win; - sm_abortWindow->Show(TRUE); - wxYield(); - - printout->OnBeginPrinting(); - - bool keepGoing = TRUE; - - int copyCount; - for (copyCount = 1; copyCount <= m_printData.GetNoCopies(); copyCount ++) - { - if (!printout->OnBeginDocument(m_printData.GetFromPage(), m_printData.GetToPage())) + if (!win) { - wxEndBusyCursor(); - wxMessageBox("Could not start printing.", "Print Error", wxOK, parent); - break; + wxLogDebug(wxT("Could not create an abort dialog.")); + sm_lastError = wxPRINTER_ERROR; + + delete dc; + return false; } - if (sm_abortIt) - break; + sm_abortWindow = win; + sm_abortWindow->Show(); + wxSafeYield(); - int pn; - for (pn = m_printData.GetFromPage(); keepGoing && (pn <= m_printData.GetToPage()) && printout->HasPage(pn); - pn++) + printout->OnBeginPrinting(); + + sm_lastError = wxPRINTER_NO_ERROR; + + int minPageNum = minPage, maxPageNum = maxPage; + + if ( !m_printDialogData.GetAllPages() ) { - if (sm_abortIt) - { - keepGoing = FALSE; - break; - } - else - { -// int dcID = ::SaveDC(dc->GetHDC()); - dc->StartPage(); - printout->OnPrintPage(pn); - dc->EndPage(); -// ::RestoreDC(dc->GetHDC(), dcID); - } + minPageNum = m_printDialogData.GetFromPage(); + maxPageNum = m_printDialogData.GetToPage(); } - printout->OnEndDocument(); - } - printout->OnEndPrinting(); + int copyCount; + for ( copyCount = 1; + copyCount <= m_printDialogData.GetNoCopies(); + copyCount++ ) + { + if ( !printout->OnBeginDocument(minPageNum, maxPageNum) ) + { + wxLogError(_("Could not start printing.")); + sm_lastError = wxPRINTER_ERROR; + break; + } + if (sm_abortIt) + { + sm_lastError = wxPRINTER_CANCELLED; + break; + } - if (sm_abortWindow) - { - sm_abortWindow->Show(FALSE); - delete sm_abortWindow; - sm_abortWindow = NULL; - } + int pn; + + for ( pn = minPageNum; + pn <= maxPageNum && printout->HasPage(pn); + pn++ ) + { + if ( sm_abortIt ) + { + sm_lastError = wxPRINTER_CANCELLED; + break; + } + + dc->StartPage(); + bool cont = printout->OnPrintPage(pn); + dc->EndPage(); + + if ( !cont ) + { + sm_lastError = wxPRINTER_CANCELLED; + break; + } + } + + printout->OnEndDocument(); + } + + printout->OnEndPrinting(); - wxEndBusyCursor(); + if (sm_abortWindow) + { + sm_abortWindow->Show(false); + delete sm_abortWindow; + sm_abortWindow = NULL; + } + + delete dc; - delete dc; - - return TRUE; + return sm_lastError == wxPRINTER_NO_ERROR; } -bool wxWindowsPrinter::PrintDialog(wxWindow *parent) +wxDC *wxWindowsPrinter::PrintDialog(wxWindow *parent) { - wxPrintDialog dialog(parent, & m_printData); - return (dialog.ShowModal() == wxID_OK); + wxDC *dc = NULL; + + wxWindowsPrintDialog dialog(parent, & m_printDialogData); + int ret = dialog.ShowModal(); + + if (ret == wxID_OK) + { + dc = dialog.GetPrintDC(); + m_printDialogData = dialog.GetPrintDialogData(); + if (dc == NULL) + sm_lastError = wxPRINTER_ERROR; + else + sm_lastError = wxPRINTER_NO_ERROR; + } + else + sm_lastError = wxPRINTER_CANCELLED; + + return dc; } -bool wxWindowsPrinter::Setup(wxWindow *parent) +bool wxWindowsPrinter::Setup(wxWindow *WXUNUSED(parent)) { - wxPrintDialog dialog(parent, & m_printData); - dialog.GetPrintData().SetSetupDialog(TRUE); - return (dialog.ShowModal() == wxID_OK); +#if 0 + // We no longer expose that dialog + wxPrintDialog dialog(parent, & m_printDialogData); + dialog.GetPrintDialogData().SetSetupDialog(true); + + int ret = dialog.ShowModal(); + + if (ret == wxID_OK) + { + m_printDialogData = dialog.GetPrintDialogData(); + } + + return (ret == wxID_OK); +#else + return false; +#endif } /* - * Print preview - */ +* Print preview +*/ -wxWindowsPrintPreview::wxWindowsPrintPreview(wxPrintout *printout, wxPrintout *printoutForPrinting, wxPrintData *data): - wxPrintPreviewBase(printout, printoutForPrinting, data) +wxWindowsPrintPreview::wxWindowsPrintPreview(wxPrintout *printout, + wxPrintout *printoutForPrinting, + wxPrintDialogData *data) + : wxPrintPreviewBase(printout, printoutForPrinting, data) { - DetermineScaling(); +#if wxUSE_HIGH_QUALITY_PREVIEW + m_hqPreviewFailed = false; +#endif + DetermineScaling(); } -wxWindowsPrintPreview::~wxWindowsPrintPreview(void) +wxWindowsPrintPreview::wxWindowsPrintPreview(wxPrintout *printout, + wxPrintout *printoutForPrinting, + wxPrintData *data) + : wxPrintPreviewBase(printout, printoutForPrinting, data) +{ +#if wxUSE_HIGH_QUALITY_PREVIEW + m_hqPreviewFailed = false; +#endif + DetermineScaling(); +} + +wxWindowsPrintPreview::~wxWindowsPrintPreview() { } bool wxWindowsPrintPreview::Print(bool interactive) { - if (!m_printPrintout) - return FALSE; - wxWindowsPrinter printer(&m_printData); - return printer.Print(m_previewFrame, m_printPrintout, interactive); + if (!m_printPrintout) + return false; + wxWindowsPrinter printer(&m_printDialogData); + return printer.Print(m_previewFrame, m_printPrintout, interactive); } -void wxWindowsPrintPreview::DetermineScaling(void) +void wxWindowsPrintPreview::DetermineScaling() { - HDC dc = ::GetDC(NULL); - int screenWidth = ::GetDeviceCaps(dc, HORZSIZE); -// int screenHeight = ::GetDeviceCaps(dc, VERTSIZE); - int screenXRes = ::GetDeviceCaps(dc, HORZRES); -// int screenYRes = ::GetDeviceCaps(dc, VERTRES); + ScreenHDC dc; int logPPIScreenX = ::GetDeviceCaps(dc, LOGPIXELSX); int logPPIScreenY = ::GetDeviceCaps(dc, LOGPIXELSY); m_previewPrintout->SetPPIScreen(logPPIScreenX, logPPIScreenY); - ::ReleaseDC(NULL, dc); - // Get a device context for the currently selected printer - wxPrinterDC printerDC("", "", "", FALSE, m_printData.GetOrientation()); + wxPrinterDC printerDC(m_printDialogData.GetPrintData()); + + int printerWidthMM; + int printerHeightMM; + int printerXRes; + int printerYRes; + int logPPIPrinterX; + int logPPIPrinterY; - int printerWidth = 150; - int printerHeight = 250; - int printerXRes = 1500; - int printerYRes = 2500; + wxRect paperRect; - if (printerDC.GetHDC()) + if ( printerDC.IsOk() ) { - printerWidth = ::GetDeviceCaps((HDC) printerDC.GetHDC(), HORZSIZE); - printerHeight = ::GetDeviceCaps((HDC) printerDC.GetHDC(), VERTSIZE); - printerXRes = ::GetDeviceCaps((HDC) printerDC.GetHDC(), HORZRES); - printerYRes = ::GetDeviceCaps((HDC) printerDC.GetHDC(), VERTRES); - - int logPPIPrinterX = ::GetDeviceCaps((HDC) printerDC.GetHDC(), LOGPIXELSX); - int logPPIPrinterY = ::GetDeviceCaps((HDC) printerDC.GetHDC(), LOGPIXELSY); - - m_previewPrintout->SetPPIPrinter(logPPIPrinterX, logPPIPrinterY); - m_previewPrintout->SetPageSizeMM(printerWidth, printerHeight); - - if (logPPIPrinterX == 0 || logPPIPrinterY == 0 || printerWidth == 0 || printerHeight == 0) - m_isOk = FALSE; + wxPrinterDCImpl *impl = (wxPrinterDCImpl*) printerDC.GetImpl(); + HDC dc = GetHdcOf(*impl); + printerWidthMM = ::GetDeviceCaps(dc, HORZSIZE); + printerHeightMM = ::GetDeviceCaps(dc, VERTSIZE); + printerXRes = ::GetDeviceCaps(dc, HORZRES); + printerYRes = ::GetDeviceCaps(dc, VERTRES); + logPPIPrinterX = ::GetDeviceCaps(dc, LOGPIXELSX); + logPPIPrinterY = ::GetDeviceCaps(dc, LOGPIXELSY); + + paperRect = printerDC.GetPaperRect(); + + if ( logPPIPrinterX == 0 || + logPPIPrinterY == 0 || + printerWidthMM == 0 || + printerHeightMM == 0 ) + { + m_isOk = false; + } } else - m_isOk = FALSE; - + { + // use some defaults + printerWidthMM = 150; + printerHeightMM = 250; + printerXRes = 1500; + printerYRes = 2500; + logPPIPrinterX = 600; + logPPIPrinterY = 600; + + paperRect = wxRect(0, 0, printerXRes, printerYRes); + m_isOk = false; + } m_pageWidth = printerXRes; m_pageHeight = printerYRes; + m_previewPrintout->SetPageSizePixels(printerXRes, printerYRes); + m_previewPrintout->SetPageSizeMM(printerWidthMM, printerHeightMM); + m_previewPrintout->SetPaperRectPixels(paperRect); + m_previewPrintout->SetPPIPrinter(logPPIPrinterX, logPPIPrinterY); // At 100%, the page should look about page-size on the screen. - m_previewScale = (float)((float)screenWidth/(float)printerWidth); - m_previewScale = m_previewScale * (float)((float)screenXRes/(float)printerYRes); + m_previewScaleX = float(logPPIScreenX) / logPPIPrinterX; + m_previewScaleY = float(logPPIScreenY) / logPPIPrinterY; +} + + +#if wxUSE_HIGH_QUALITY_PREVIEW + +// 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 attempt to render the preview into high-resolution bitmap +// using DC with same resolution etc. as the printer DC. This takes lot of +// memory, so the code is more complicated than it could be, but the results +// are much better. +// +// Finally, this code is specific to wxMSW, because it doesn't make sense to +// bother with it on other platforms. Both OSX and modern GNOME/GTK+ +// environments have builtin accurate preview (that applications should use +// instead) and the differences between screen and printer DC in wxGTK are so +// large than this trick doesn't help at all. + +namespace +{ + +// If there's not enough memory, we need to render the preview in parts. +// Unfortunately we cannot simply use wxMemoryDC, because it reports its size +// as bitmap's size, and we need to use smaller bitmap while still reporting +// original ("correct") DC size, because printing code frequently uses +// GetSize() to determine scaling factor. This DC class handles this. + +class PageFragmentDCImpl : public wxMemoryDCImpl +{ +public: + PageFragmentDCImpl(wxMemoryDC *owner, wxDC *printer, + const wxPoint& offset, + const wxSize& fullSize) + : wxMemoryDCImpl(owner, printer), + m_offset(offset), + m_fullSize(fullSize) + { + SetDeviceOrigin(0, 0); + } + + virtual void SetDeviceOrigin(wxCoord x, wxCoord y) + { + wxMemoryDCImpl::SetDeviceOrigin(x - m_offset.x, y - m_offset.y); + } + + virtual void DoGetDeviceOrigin(wxCoord *x, wxCoord *y) const + { + wxMemoryDCImpl::DoGetDeviceOrigin(x, y); + if ( x ) *x += m_offset.x; + if ( x ) *y += m_offset.y; + } + + virtual void DoGetSize(int *width, int *height) const + { + if ( width ) + *width = m_fullSize.x; + if ( height ) + *height = m_fullSize.y; + } + +private: + wxPoint m_offset; + wxSize m_fullSize; +}; + +class PageFragmentDC : public wxDC +{ +public: + PageFragmentDC(wxDC* printer, wxBitmap& bmp, + const wxPoint& offset, + const wxSize& fullSize) + : wxDC(new PageFragmentDCImpl((wxMemoryDC*)this, printer, offset, fullSize)) + { + static_cast(m_pimpl)->DoSelect(bmp); + } +}; + +// estimate how big chunks we can render, given available RAM +long ComputeFragmentSize(long printerDepth, + long width, + long height) +{ + // Compute the amount of memory needed to generate the preview. + // Memory requirements of RenderPageFragment() are as follows: + // + // (memory DC - always) + // width * height * printerDepth/8 + // (wxImage + wxDIB instance) + // width * height * (3 + 4) + // (this could be reduced to *3 if using wxGraphicsContext) + // + // So, given amount of memory M, we can render at most + // + // height = M / (width * (printerDepth/8 + F)) + // + // where F is 3 or 7 depending on whether wxGraphicsContext is used or not + + wxMemorySize memAvail = wxGetFreeMemory(); + if ( memAvail == -1 ) + { + // we don't know; 10meg shouldn't be a problem hopefully + memAvail = 10000000; + } + else + { + // limit ourselves to half of available RAM to have a margin for other + // apps, for our rendering code, and for miscalculations + memAvail /= 2; + } + + const float perPixel = float(printerDepth)/8 + (3 + 4); + + const long perLine = long(width * perPixel); + const long maxstep = (memAvail / perLine).GetValue(); + const long step = wxMin(height, maxstep); + + wxLogTrace("printing", + "using %liMB of RAM (%li lines) for preview, %li %lipx fragments", + long((memAvail >> 20).GetValue()), + maxstep, + (height+step-1) / step, + step); + + return step; } +} // anonymous namespace + + +bool wxWindowsPrintPreview::RenderPageFragment(float scaleX, float scaleY, + int *nextFinalLine, + wxPrinterDC& printer, + wxMemoryDC& finalDC, + const wxRect& rect, + int pageNum) +{ + // compute 'rect' equivalent in the small final bitmap: + const wxRect smallRect(wxPoint(0, *nextFinalLine), + wxPoint(int(rect.GetRight() * scaleX), + int(rect.GetBottom() * scaleY))); + wxLogTrace("printing", + "rendering fragment of page %i: [%i,%i,%i,%i] scaled down to [%i,%i,%i,%i]", + pageNum, + rect.x, rect.y, rect.GetRight(), rect.GetBottom(), + smallRect.x, smallRect.y, smallRect.GetRight(), smallRect.GetBottom() + ); + + // create DC and bitmap compatible with printer DC: + wxBitmap large(rect.width, rect.height, printer); + if ( !large.IsOk() ) + return false; + + // render part of the page into it: + { + PageFragmentDC memoryDC(&printer, large, + rect.GetPosition(), + wxSize(m_pageWidth, m_pageHeight)); + if ( !memoryDC.IsOk() ) + return false; + + memoryDC.Clear(); + + if ( !RenderPageIntoDC(memoryDC, pageNum) ) + return false; + } // release bitmap from memoryDC + + // now scale the rendered part down and blit it into final output: + + wxImage img; + { + wxDIB dib(large); + if ( !dib.IsOk() ) + return false; + large = wxNullBitmap; // free memory a.s.a.p. + img = dib.ConvertToImage(); + } // free the DIB now that it's no longer needed, too + + if ( !img.IsOk() ) + return false; + + img.Rescale(smallRect.width, smallRect.height, wxIMAGE_QUALITY_HIGH); + if ( !img.IsOk() ) + return false; + + wxBitmap bmp(img); + if ( !bmp.IsOk() ) + return false; + + img = wxNullImage; + finalDC.DrawBitmap(bmp, smallRect.x, smallRect.y); + if ( bmp.IsOk() ) + { + *nextFinalLine += smallRect.height; + return true; + } + + return false; +} + +bool wxWindowsPrintPreview::RenderPageIntoBitmapHQ(wxBitmap& bmp, int pageNum) +{ + wxLogTrace("printing", "rendering HQ preview of page %i", pageNum); + + wxPrinterDC printerDC(m_printDialogData.GetPrintData()); + if ( !printerDC.IsOk() ) + return false; + + // compute scale factor + const float scaleX = float(bmp.GetWidth()) / float(m_pageWidth); + const float scaleY = float(bmp.GetHeight()) / float(m_pageHeight); + + wxMemoryDC bmpDC; + bmpDC.SelectObject(bmp); + bmpDC.Clear(); + + const int initialStep = ComputeFragmentSize(printerDC.GetDepth(), + m_pageWidth, m_pageHeight); + + wxRect todo(0, 0, m_pageWidth, initialStep); // rect to render + int nextFinalLine = 0; // first not-yet-rendered output line + + while ( todo.y < m_pageHeight ) + { + todo.SetBottom(wxMin(todo.GetBottom(), m_pageHeight - 1)); + + if ( !RenderPageFragment(scaleX, scaleY, + &nextFinalLine, + printerDC, + bmpDC, + todo, + pageNum) ) + { + if ( todo.height < 20 ) + { + // something is very wrong if we can't render even at this + // slow space, let's bail out and fall back to low quality + // preview + wxLogTrace("printing", + "it seems that HQ preview doesn't work at all"); + return false; + } + + // it's possible our memory calculation was off, or conditions + // changed, or there's not enough _bitmap_ resources; try if using + // smaller bitmap would help: + todo.height /= 2; + + wxLogTrace("printing", + "preview of fragment failed, reducing height to %ipx", + todo.height); + + continue; // retry at the same position again + } + + // move to the next segment + todo.Offset(0, todo.height); + } + + return true; +} + +bool wxWindowsPrintPreview::RenderPageIntoBitmap(wxBitmap& bmp, int pageNum) +{ + // try high quality rendering first: + if ( !m_hqPreviewFailed ) + { + if ( RenderPageIntoBitmapHQ(bmp, pageNum) ) + { + return true; + } + else + { + wxLogTrace("printing", + "high-quality preview failed, falling back to normal"); + m_hqPreviewFailed = true; // don't bother re-trying + } + } + + // if it fails, use the generic method that is less resource intensive, + // but inexact + return wxPrintPreviewBase::RenderPageIntoBitmap(bmp, pageNum); +} + +#endif // wxUSE_HIGH_QUALITY_PREVIEW + /**************************************************************************** - FUNCTION: wxAbortProc() + FUNCTION: wxAbortProc() PURPOSE: Processes messages for the Abort Dialog box @@ -350,7 +737,7 @@ LONG APIENTRY _EXPORT wxAbortProc(HDC WXUNUSED(hPr), int WXUNUSED(Code)) /* Process messages intended for the abort dialog box */ - while (!wxPrinterBase::sm_abortIt && PeekMessage(&msg, 0, 0, 0, TRUE)) + while (!wxPrinterBase::sm_abortIt && ::PeekMessage(&msg, 0, 0, 0, TRUE)) if (!IsDialogMessage((HWND) wxPrinterBase::sm_abortWindow->GetHWND(), &msg)) { TranslateMessage(&msg); DispatchMessage(&msg); @@ -358,6 +745,8 @@ LONG APIENTRY _EXPORT wxAbortProc(HDC WXUNUSED(hPr), int WXUNUSED(Code)) /* bAbort is TRUE (return is FALSE) if the user has aborted */ - return (!wxPrinterBase::sm_abortIt); + return !wxPrinterBase::sm_abortIt; } +#endif + // wxUSE_PRINTING_ARCHITECTURE