The Tor Browser: widget/gtk/nsDeviceContextSpecG.cpp@b8a032363ba2 (annotated)

widget/gtk/nsDeviceContextSpecG.cpp@b8a032363ba2 (annotated)

widget/gtk/nsDeviceContextSpecG.cpp

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #ifdef MOZ_LOGGING
 #define FORCE_PR_LOG 1 /* Allow logging in the release build */
 #endif /* MOZ_LOGGING */
 #include "prlog.h"
 #include "plstr.h"
 #include "nsDeviceContextSpecG.h"
 #include "prenv.h" /* for PR_GetEnv */
 #include "nsPrintfCString.h"
 #include "nsReadableUtils.h"
 #include "nsStringEnumerator.h"
 #include "nsIServiceManager.h"
 #include "nsPSPrinters.h"
 #include "nsPaperPS.h"  /* Paper size list */
 #include "nsPrintSettingsGTK.h"
 #include "nsIFileStreams.h"
 #include "nsIFile.h"
 #include "nsTArray.h"
 #include "mozilla/Preferences.h"
 #include <unistd.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 using namespace mozilla;
 #ifdef PR_LOGGING
 static PRLogModuleInfo *
 GetDeviceContextSpecGTKLog()
 {
   static PRLogModuleInfo *sLog;
   if (!sLog)
     sLog = PR_NewLogModule("DeviceContextSpecGTK");
   return sLog;
 }
 #endif /* PR_LOGGING */
 /* Macro to make lines shorter */
 #define DO_PR_DEBUG_LOG(x) PR_LOG(GetDeviceContextSpecGTKLog(), PR_LOG_DEBUG, x)
 //----------------------------------------------------------------------------------
 // The printer data is shared between the PrinterEnumerator and the nsDeviceContextSpecGTK
 // The PrinterEnumerator creates the printer info
 // but the nsDeviceContextSpecGTK cleans it up
 // If it gets created (via the Page Setup Dialog) but the user never prints anything
 // then it will never be delete, so this class takes care of that.
 class GlobalPrinters {
 public:
   static GlobalPrinters* GetInstance()   { return &mGlobalPrinters; }
   ~GlobalPrinters()                      { FreeGlobalPrinters(); }
   void      FreeGlobalPrinters();
   nsresult  InitializeGlobalPrinters();
   bool      PrintersAreAllocated()       { return mGlobalPrinterList != nullptr; }
   uint32_t  GetNumPrinters()
     { return mGlobalPrinterList ? mGlobalPrinterList->Length() : 0; }
   nsString* GetStringAt(int32_t aInx)    { return &mGlobalPrinterList->ElementAt(aInx); }
   void      GetDefaultPrinterName(char16_t **aDefaultPrinterName);
 protected:
   GlobalPrinters() {}
   static GlobalPrinters mGlobalPrinters;
   static nsTArray<nsString>* mGlobalPrinterList;
 };
 //---------------
 // static members
 GlobalPrinters GlobalPrinters::mGlobalPrinters;
 nsTArray<nsString>* GlobalPrinters::mGlobalPrinterList = nullptr;
 //---------------
 nsDeviceContextSpecGTK::nsDeviceContextSpecGTK()
   : mPrintJob(nullptr)
   , mGtkPrinter(nullptr)
   , mGtkPrintSettings(nullptr)
   , mGtkPageSetup(nullptr)
 {
   DO_PR_DEBUG_LOG(("nsDeviceContextSpecGTK::nsDeviceContextSpecGTK()\n"));
 }
 nsDeviceContextSpecGTK::~nsDeviceContextSpecGTK()
 {
   DO_PR_DEBUG_LOG(("nsDeviceContextSpecGTK::~nsDeviceContextSpecGTK()\n"));
   if (mGtkPageSetup) {
     g_object_unref(mGtkPageSetup);
   }
   if (mGtkPrintSettings) {
     g_object_unref(mGtkPrintSettings);
   }
 }
 NS_IMPL_ISUPPORTS(nsDeviceContextSpecGTK,
                   nsIDeviceContextSpec)
 #include "gfxPDFSurface.h"
 #include "gfxPSSurface.h"
 NS_IMETHODIMP nsDeviceContextSpecGTK::GetSurfaceForPrinter(gfxASurface **aSurface)
 {
   *aSurface = nullptr;
   const char *path;
   GetPath(&path);
   double width, height;
   mPrintSettings->GetEffectivePageSize(&width, &height);
   // convert twips to points
   width  /= TWIPS_PER_POINT_FLOAT;
   height /= TWIPS_PER_POINT_FLOAT;
   DO_PR_DEBUG_LOG(("\"%s\", %f, %f\n", path, width, height));
   nsresult rv;
   // Spool file. Use Glib's temporary file function since we're
   // already dependent on the gtk software stack.
   gchar *buf;
   gint fd = g_file_open_tmp("XXXXXX.tmp", &buf, nullptr);
   if (-1 == fd)
     return NS_ERROR_GFX_PRINTER_COULD_NOT_OPEN_FILE;
   close(fd);
   rv = NS_NewNativeLocalFile(nsDependentCString(buf), false,
                              getter_AddRefs(mSpoolFile));
   if (NS_FAILED(rv)) {
     unlink(buf);
     return NS_ERROR_GFX_PRINTER_COULD_NOT_OPEN_FILE;
   }
   mSpoolName = buf;
   g_free(buf);
   mSpoolFile->SetPermissions(0600);
   nsCOMPtr<nsIFileOutputStream> stream = do_CreateInstance("@mozilla.org/network/file-output-stream;1");
   rv = stream->Init(mSpoolFile, -1, -1, 0);
   if (NS_FAILED(rv))
     return rv;
   int16_t format;
   mPrintSettings->GetOutputFormat(&format);
   nsRefPtr<gfxASurface> surface;
   gfxSize surfaceSize(width, height);
   // Determine the real format with some GTK magic
   if (format == nsIPrintSettings::kOutputFormatNative) {
     if (mIsPPreview) {
       // There is nothing to detect on Print Preview, use PS.
       format = nsIPrintSettings::kOutputFormatPS;
     } else {
       const gchar* fmtGTK = gtk_print_settings_get(mGtkPrintSettings, GTK_PRINT_SETTINGS_OUTPUT_FILE_FORMAT);
       if (!fmtGTK && GTK_IS_PRINTER(mGtkPrinter)) {
         // Likely not print-to-file, check printer's capabilities
         // Prior to gtk 2.24, gtk_printer_accepts_pdf() and
         // gtk_printer_accepts_ps() always returned true regardless of the
         // printer's capability.
         if (gtk_major_version > 2 ||
             (gtk_major_version == 2 && gtk_minor_version >= 24)) {
           format =
             gtk_printer_accepts_pdf(mGtkPrinter) ?
             static_cast<int16_t>(nsIPrintSettings::kOutputFormatPDF) :
             static_cast<int16_t>(nsIPrintSettings::kOutputFormatPS);
         } else {
           format = nsIPrintSettings::kOutputFormatPS;
         }
       } else if (nsDependentCString(fmtGTK).EqualsIgnoreCase("pdf")) {
         format = nsIPrintSettings::kOutputFormatPDF;
       } else {
         format = nsIPrintSettings::kOutputFormatPS;
       }
     }
   }
   if (format == nsIPrintSettings::kOutputFormatPDF) {
     surface = new gfxPDFSurface(stream, surfaceSize);
   } else {
     int32_t orientation;
     mPrintSettings->GetOrientation(&orientation);
     if (nsIPrintSettings::kPortraitOrientation == orientation) {
       surface = new gfxPSSurface(stream, surfaceSize, gfxPSSurface::PORTRAIT);
     } else {
       surface = new gfxPSSurface(stream, surfaceSize, gfxPSSurface::LANDSCAPE);
     }
   }
   if (!surface)
     return NS_ERROR_OUT_OF_MEMORY;
   surface.swap(*aSurface);
   return NS_OK;
 }
 /** -------------------------------------------------------
  *  Initialize the nsDeviceContextSpecGTK
  *  @update   dc 2/15/98
  *  @update   syd 3/2/99
  */
 NS_IMETHODIMP nsDeviceContextSpecGTK::Init(nsIWidget *aWidget,
                                            nsIPrintSettings* aPS,
                                            bool aIsPrintPreview)
 {
   DO_PR_DEBUG_LOG(("nsDeviceContextSpecGTK::Init(aPS=%p)\n", aPS));
   if (gtk_major_version < 2 ||
       (gtk_major_version == 2 && gtk_minor_version < 10))
     return NS_ERROR_NOT_AVAILABLE;  // I'm so sorry bz
   mPrintSettings = aPS;
   mIsPPreview = aIsPrintPreview;
   // This is only set by embedders
   bool toFile;
   aPS->GetPrintToFile(&toFile);
   mToPrinter = !toFile && !aIsPrintPreview;
   nsCOMPtr<nsPrintSettingsGTK> printSettingsGTK(do_QueryInterface(aPS));
   if (!printSettingsGTK)
     return NS_ERROR_NO_INTERFACE;
   mGtkPrinter = printSettingsGTK->GetGtkPrinter();
   mGtkPrintSettings = printSettingsGTK->GetGtkPrintSettings();
   mGtkPageSetup = printSettingsGTK->GetGtkPageSetup();
   // This is a horrible workaround for some printer driver bugs that treat custom page sizes different
   // to standard ones. If our paper object matches one of a standard one, use a standard paper size
   // object instead. See bug 414314 for more info.
   GtkPaperSize* geckosHackishPaperSize = gtk_page_setup_get_paper_size(mGtkPageSetup);
   GtkPaperSize* standardGtkPaperSize = gtk_paper_size_new(gtk_paper_size_get_name(geckosHackishPaperSize));
   mGtkPageSetup = gtk_page_setup_copy(mGtkPageSetup);
   mGtkPrintSettings = gtk_print_settings_copy(mGtkPrintSettings);
   GtkPaperSize* properPaperSize;
   if (gtk_paper_size_is_equal(geckosHackishPaperSize, standardGtkPaperSize)) {
     properPaperSize = standardGtkPaperSize;
   } else {
     properPaperSize = geckosHackishPaperSize;
   }
   gtk_print_settings_set_paper_size(mGtkPrintSettings, properPaperSize);
   gtk_page_setup_set_paper_size_and_default_margins(mGtkPageSetup, properPaperSize);
   gtk_paper_size_free(standardGtkPaperSize);
   return NS_OK;
 }
 NS_IMETHODIMP nsDeviceContextSpecGTK::GetPath(const char **aPath)
 {
   *aPath = mPath;
   return NS_OK;
 }
 /* static !! */
 nsresult nsDeviceContextSpecGTK::GetPrintMethod(const char *aPrinter, PrintMethod &aMethod)
 {
   aMethod = pmPostScript;
   return NS_OK;
 }
 static void
 #if (MOZ_WIDGET_GTK == 3)
 print_callback(GtkPrintJob *aJob, gpointer aData, const GError *aError) {
 #else
 print_callback(GtkPrintJob *aJob, gpointer aData, GError *aError) {
 #endif
   g_object_unref(aJob);
   ((nsIFile*) aData)->Remove(false);
 }
 static void
 ns_release_macro(gpointer aData) {
   nsIFile* spoolFile = (nsIFile*) aData;
   NS_RELEASE(spoolFile);
 }
 NS_IMETHODIMP nsDeviceContextSpecGTK::BeginDocument(const nsAString& aTitle, char16_t * aPrintToFileName,
                                                     int32_t aStartPage, int32_t aEndPage)
 {
   if (mToPrinter) {
     if (!GTK_IS_PRINTER(mGtkPrinter))
       return NS_ERROR_FAILURE;
     mPrintJob = gtk_print_job_new(NS_ConvertUTF16toUTF8(aTitle).get(), mGtkPrinter,
                                   mGtkPrintSettings, mGtkPageSetup);
   }
   return NS_OK;
 }
 NS_IMETHODIMP nsDeviceContextSpecGTK::EndDocument()
 {
   if (mToPrinter) {
     if (!mPrintJob)
       return NS_OK; // The operation was aborted.
     if (!gtk_print_job_set_source_file(mPrintJob, mSpoolName.get(), nullptr))
       return NS_ERROR_GFX_PRINTER_COULD_NOT_OPEN_FILE;
     NS_ADDREF(mSpoolFile.get());
     gtk_print_job_send(mPrintJob, print_callback, mSpoolFile, ns_release_macro);
   } else {
     // Handle print-to-file ourselves for the benefit of embedders
     nsXPIDLString targetPath;
     nsCOMPtr<nsIFile> destFile;
     mPrintSettings->GetToFileName(getter_Copies(targetPath));
     nsresult rv = NS_NewNativeLocalFile(NS_ConvertUTF16toUTF8(targetPath),
                                         false, getter_AddRefs(destFile));
     NS_ENSURE_SUCCESS(rv, rv);
     nsAutoString destLeafName;
     rv = destFile->GetLeafName(destLeafName);
     NS_ENSURE_SUCCESS(rv, rv);
     nsCOMPtr<nsIFile> destDir;
     rv = destFile->GetParent(getter_AddRefs(destDir));
     NS_ENSURE_SUCCESS(rv, rv);
     rv = mSpoolFile->MoveTo(destDir, destLeafName);
     NS_ENSURE_SUCCESS(rv, rv);
     // This is the standard way to get the UNIX umask. Ugh.
     mode_t mask = umask(0);
     umask(mask);
     // If you're not familiar with umasks, they contain the bits of what NOT to set in the permissions
     // (thats because files and directories have different numbers of bits for their permissions)
     destFile->SetPermissions(0666 & ~(mask));
   }
   return NS_OK;
 }
 /* Get prefs for printer
  * Search order:
  * - Get prefs per printer name and module name
  * - Get prefs per printer name
  * - Get prefs per module name
  * - Get prefs
  */
 static
 nsresult CopyPrinterCharPref(const char *modulename, const char *printername,
                              const char *prefname, nsCString &return_buf)
 {
   DO_PR_DEBUG_LOG(("CopyPrinterCharPref('%s', '%s', '%s')\n", modulename, printername, prefname));
   nsresult rv = NS_ERROR_FAILURE;
   if (printername && modulename) {
     /* Get prefs per printer name and module name */
     nsPrintfCString name("print.%s.printer_%s.%s", modulename, printername, prefname);
     DO_PR_DEBUG_LOG(("trying to get '%s'\n", name.get()));
     rv = Preferences::GetCString(name.get(), &return_buf);
   }
   if (NS_FAILED(rv)) {
     if (printername) {
       /* Get prefs per printer name */
       nsPrintfCString name("print.printer_%s.%s", printername, prefname);
       DO_PR_DEBUG_LOG(("trying to get '%s'\n", name.get()));
       rv = Preferences::GetCString(name.get(), &return_buf);
     }
     if (NS_FAILED(rv)) {
       if (modulename) {
         /* Get prefs per module name */
         nsPrintfCString name("print.%s.%s", modulename, prefname);
         DO_PR_DEBUG_LOG(("trying to get '%s'\n", name.get()));
         rv = Preferences::GetCString(name.get(), &return_buf);
       }
       if (NS_FAILED(rv)) {
         /* Get prefs */
         nsPrintfCString name("print.%s", prefname);
         DO_PR_DEBUG_LOG(("trying to get '%s'\n", name.get()));
         rv = Preferences::GetCString(name.get(), &return_buf);
       }
     }
   }
 #ifdef PR_LOG
   if (NS_SUCCEEDED(rv)) {
     DO_PR_DEBUG_LOG(("CopyPrinterCharPref returning '%s'.\n", return_buf.get()));
   }
   else
   {
     DO_PR_DEBUG_LOG(("CopyPrinterCharPref failure.\n"));
   }
 #endif /* PR_LOG */
   return rv;
 }
 //  Printer Enumerator
 nsPrinterEnumeratorGTK::nsPrinterEnumeratorGTK()
 {
 }
 NS_IMPL_ISUPPORTS(nsPrinterEnumeratorGTK, nsIPrinterEnumerator)
 NS_IMETHODIMP nsPrinterEnumeratorGTK::GetPrinterNameList(nsIStringEnumerator **aPrinterNameList)
 {
   NS_ENSURE_ARG_POINTER(aPrinterNameList);
   *aPrinterNameList = nullptr;
   nsresult rv = GlobalPrinters::GetInstance()->InitializeGlobalPrinters();
   if (NS_FAILED(rv)) {
     return rv;
   }
   uint32_t numPrinters = GlobalPrinters::GetInstance()->GetNumPrinters();
   nsTArray<nsString> *printers = new nsTArray<nsString>(numPrinters);
   if (!printers) {
     GlobalPrinters::GetInstance()->FreeGlobalPrinters();
     return NS_ERROR_OUT_OF_MEMORY;
   }
   uint32_t count = 0;
   while( count < numPrinters )
   {
     printers->AppendElement(*GlobalPrinters::GetInstance()->GetStringAt(count++));
   }
   GlobalPrinters::GetInstance()->FreeGlobalPrinters();
   return NS_NewAdoptingStringEnumerator(aPrinterNameList, printers);
 }
 /* readonly attribute wstring defaultPrinterName; */
 NS_IMETHODIMP nsPrinterEnumeratorGTK::GetDefaultPrinterName(char16_t **aDefaultPrinterName)
 {
   DO_PR_DEBUG_LOG(("nsPrinterEnumeratorGTK::GetDefaultPrinterName()\n"));
   NS_ENSURE_ARG_POINTER(aDefaultPrinterName);
   GlobalPrinters::GetInstance()->GetDefaultPrinterName(aDefaultPrinterName);
   DO_PR_DEBUG_LOG(("GetDefaultPrinterName(): default printer='%s'.\n", NS_ConvertUTF16toUTF8(*aDefaultPrinterName).get()));
   return NS_OK;
 }
 /* void initPrintSettingsFromPrinter (in wstring aPrinterName, in nsIPrintSettings aPrintSettings); */
 NS_IMETHODIMP nsPrinterEnumeratorGTK::InitPrintSettingsFromPrinter(const char16_t *aPrinterName, nsIPrintSettings *aPrintSettings)
 {
   DO_PR_DEBUG_LOG(("nsPrinterEnumeratorGTK::InitPrintSettingsFromPrinter()"));
   nsresult rv;
   NS_ENSURE_ARG_POINTER(aPrinterName);
   NS_ENSURE_ARG_POINTER(aPrintSettings);
   NS_ENSURE_TRUE(*aPrinterName, NS_ERROR_FAILURE);
   NS_ENSURE_TRUE(aPrintSettings, NS_ERROR_FAILURE);
   nsXPIDLCString fullPrinterName, /* Full name of printer incl. driver-specific prefix */
                  printerName;     /* "Stripped" name of printer */
   fullPrinterName.Assign(NS_ConvertUTF16toUTF8(aPrinterName));
   printerName.Assign(NS_ConvertUTF16toUTF8(aPrinterName));
   DO_PR_DEBUG_LOG(("printerName='%s'\n", printerName.get()));
   PrintMethod type = pmInvalid;
   rv = nsDeviceContextSpecGTK::GetPrintMethod(printerName, type);
   if (NS_FAILED(rv))
     return rv;
   /* "Demangle" postscript printer name */
   if (type == pmPostScript) {
     /* Strip the printing method name from the printer,
      * e.g. turn "PostScript/foobar" to "foobar" */
     int32_t slash = printerName.FindChar('/');
     if (kNotFound != slash)
       printerName.Cut(0, slash + 1);
   }
   /* Set filename */
   nsAutoCString filename;
   if (NS_FAILED(CopyPrinterCharPref(nullptr, printerName, "filename", filename))) {
     const char *path;
     if (!(path = PR_GetEnv("PWD")))
       path = PR_GetEnv("HOME");
     if (path)
       filename = nsPrintfCString("%s/mozilla.pdf", path);
     else
       filename.AssignLiteral("mozilla.pdf");
   }
   DO_PR_DEBUG_LOG(("Setting default filename to '%s'\n", filename.get()));
   aPrintSettings->SetToFileName(NS_ConvertUTF8toUTF16(filename).get());
   aPrintSettings->SetIsInitializedFromPrinter(true);
   if (type == pmPostScript) {
     DO_PR_DEBUG_LOG(("InitPrintSettingsFromPrinter() for PostScript printer\n"));
     nsAutoCString orientation;
     if (NS_SUCCEEDED(CopyPrinterCharPref("postscript", printerName,
                                          "orientation", orientation))) {
       if (orientation.LowerCaseEqualsLiteral("portrait")) {
         DO_PR_DEBUG_LOG(("setting default orientation to 'portrait'\n"));
         aPrintSettings->SetOrientation(nsIPrintSettings::kPortraitOrientation);
       }
       else if (orientation.LowerCaseEqualsLiteral("landscape")) {
         DO_PR_DEBUG_LOG(("setting default orientation to 'landscape'\n"));
         aPrintSettings->SetOrientation(nsIPrintSettings::kLandscapeOrientation);
       }
       else {
         DO_PR_DEBUG_LOG(("Unknown default orientation '%s'\n", orientation.get()));
       }
     }
     /* PostScript module does not support changing the plex mode... */
     DO_PR_DEBUG_LOG(("setting default plex to '%s'\n", "default"));
     aPrintSettings->SetPlexName(MOZ_UTF16("default"));
     /* PostScript module does not support changing the resolution mode... */
     DO_PR_DEBUG_LOG(("setting default resolution to '%s'\n", "default"));
     aPrintSettings->SetResolutionName(MOZ_UTF16("default"));
     /* PostScript module does not support changing the colorspace... */
     DO_PR_DEBUG_LOG(("setting default colorspace to '%s'\n", "default"));
     aPrintSettings->SetColorspace(MOZ_UTF16("default"));
     nsAutoCString papername;
     if (NS_SUCCEEDED(CopyPrinterCharPref("postscript", printerName,
                                          "paper_size", papername))) {
       nsPaperSizePS paper;
       if (paper.Find(papername.get())) {
         DO_PR_DEBUG_LOG(("setting default paper size to '%s' (%g mm/%g mm)\n",
               paper.Name(), paper.Width_mm(), paper.Height_mm()));
 	aPrintSettings->SetPaperSizeUnit(nsIPrintSettings::kPaperSizeMillimeters);
         aPrintSettings->SetPaperWidth(paper.Width_mm());
         aPrintSettings->SetPaperHeight(paper.Height_mm());
         aPrintSettings->SetPaperName(NS_ConvertASCIItoUTF16(paper.Name()).get());
       }
       else {
         DO_PR_DEBUG_LOG(("Unknown paper size '%s' given.\n", papername.get()));
       }
     }
     bool hasSpoolerCmd = (nsPSPrinterList::kTypePS ==
         nsPSPrinterList::GetPrinterType(fullPrinterName));
     if (hasSpoolerCmd) {
       nsAutoCString command;
       if (NS_SUCCEEDED(CopyPrinterCharPref("postscript",
             printerName, "print_command", command))) {
         DO_PR_DEBUG_LOG(("setting default print command to '%s'\n",
             command.get()));
         aPrintSettings->SetPrintCommand(NS_ConvertUTF8toUTF16(command).get());
       }
     }
     return NS_OK;
   }
   return NS_ERROR_UNEXPECTED;
 }
 NS_IMETHODIMP nsPrinterEnumeratorGTK::DisplayPropertiesDlg(const char16_t *aPrinter, nsIPrintSettings *aPrintSettings)
 {
   return NS_OK;
 }
 //----------------------------------------------------------------------
 nsresult GlobalPrinters::InitializeGlobalPrinters ()
 {
   if (PrintersAreAllocated()) {
     return NS_OK;
   }
   mGlobalPrinterList = new nsTArray<nsString>();
   nsPSPrinterList psMgr;
   if (psMgr.Enabled()) {
     /* Get the list of PostScript-module printers */
     // XXX: this function is the only user of GetPrinterList
     // So it may be interesting to convert the nsCStrings
     // in this function, we would save one loop here
     nsTArray<nsCString> printerList;
     psMgr.GetPrinterList(printerList);
     for (uint32_t i = 0; i < printerList.Length(); i++)
     {
       mGlobalPrinterList->AppendElement(NS_ConvertUTF8toUTF16(printerList[i]));
     }
   }
   /* If there are no printers available after all checks, return an error */
   if (!mGlobalPrinterList->Length())
   {
     /* Make sure we do not cache an empty printer list */
     FreeGlobalPrinters();
     return NS_ERROR_GFX_PRINTER_NO_PRINTER_AVAILABLE;
   }
   return NS_OK;
 }
 //----------------------------------------------------------------------
 void GlobalPrinters::FreeGlobalPrinters()
 {
   if (mGlobalPrinterList) {
     delete mGlobalPrinterList;
     mGlobalPrinterList = nullptr;
   }
 }
 void
 GlobalPrinters::GetDefaultPrinterName(char16_t **aDefaultPrinterName)
 {
   *aDefaultPrinterName = nullptr;
   bool allocate = !GlobalPrinters::GetInstance()->PrintersAreAllocated();
   if (allocate) {
     nsresult rv = GlobalPrinters::GetInstance()->InitializeGlobalPrinters();
     if (NS_FAILED(rv)) {
       return;
     }
   }
   NS_ASSERTION(GlobalPrinters::GetInstance()->PrintersAreAllocated(), "no GlobalPrinters");
   if (GlobalPrinters::GetInstance()->GetNumPrinters() == 0)
     return;
   *aDefaultPrinterName = ToNewUnicode(*GlobalPrinters::GetInstance()->GetStringAt(0));
   if (allocate) {
     GlobalPrinters::GetInstance()->FreeGlobalPrinters();
   }
 }

The Tor Browser / annotate

widget/gtk/nsDeviceContextSpecG.cpp@b8a032363ba2 (annotated)

widget/gtk/nsDeviceContextSpecG.cpp