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gecko-dev/widget/gtk/nsDeviceContextSpecG.cpp
Mike Conley 24affce8d1 Bug 1090448 - nsDeviceContextSpecG should not use GtkPrinter until the print job is ready. r=karlt. 
In the multi-process case, we might need to query the system (and maybe the
network) for a printer with a name matching the one we're looking for. In
order to not spin an event loop at dangerous times (since searching for printers
is either asynchronous, or requires an event loop), we defer searching for
the printer until we've already finished reflowing and rendering the document
to be printed.

--HG--
extra : rebase_source : 5cd11982e47d3f7cb61fe697e54e310fe1a8d244
2015-03-05 16:05:33 -05:00

677 lines
22 KiB
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/* -*- 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/. */
#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()
: 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;
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", mPath, width, height));
nsresult rv;
// We shouldn't be attempting to get a surface if we've already got a spool
// file.
MOZ_ASSERT(!mSpoolFile);
// 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) {
if (nsDependentCString(fmtGTK).EqualsIgnoreCase("pdf")) {
format = nsIPrintSettings::kOutputFormatPDF;
} else {
format = nsIPrintSettings::kOutputFormatPS;
}
}
}
// If we haven't found the format at this point, we're sunk. :(
if (format == nsIPrintSettings::kOutputFormatNative) {
return NS_ERROR_FAILURE;
}
}
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 = do_QueryInterface(aPS);
if (!mPrintSettings)
return NS_ERROR_NO_INTERFACE;
mIsPPreview = aIsPrintPreview;
// This is only set by embedders
bool toFile;
aPS->GetPrintToFile(&toFile);
mToPrinter = !toFile && !aIsPrintPreview;
mGtkPrintSettings = mPrintSettings->GetGtkPrintSettings();
mGtkPageSetup = mPrintSettings->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;
}
/* 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);
}
/* static */
gboolean nsDeviceContextSpecGTK::PrinterEnumerator(GtkPrinter *aPrinter,
gpointer aData) {
nsDeviceContextSpecGTK *spec = (nsDeviceContextSpecGTK*)aData;
// Find the printer whose name matches the one inside the settings.
nsXPIDLString printerName;
nsresult rv =
spec->mPrintSettings->GetPrinterName(getter_Copies(printerName));
if (NS_SUCCEEDED(rv) && printerName) {
NS_ConvertUTF16toUTF8 requestedName(printerName);
const char* currentName = gtk_printer_get_name(aPrinter);
if (requestedName.Equals(currentName)) {
nsDeviceContextSpecGTK::StartPrintJob(spec, aPrinter);
return TRUE;
}
}
// We haven't found it yet - keep searching...
return FALSE;
}
/* static */
void nsDeviceContextSpecGTK::StartPrintJob(nsDeviceContextSpecGTK* spec,
GtkPrinter* printer) {
GtkPrintJob* job = gtk_print_job_new(spec->mTitle.get(),
printer,
spec->mGtkPrintSettings,
spec->mGtkPageSetup);
if (!gtk_print_job_set_source_file(job, spec->mSpoolName.get(), nullptr))
return;
NS_ADDREF(spec->mSpoolFile.get());
gtk_print_job_send(job, print_callback, spec->mSpoolFile, ns_release_macro);
}
void
nsDeviceContextSpecGTK::EnumeratePrinters()
{
gtk_enumerate_printers(&nsDeviceContextSpecGTK::PrinterEnumerator, this,
nullptr, TRUE);
}
NS_IMETHODIMP nsDeviceContextSpecGTK::BeginDocument(const nsAString& aTitle, char16_t * aPrintToFileName,
int32_t aStartPage, int32_t aEndPage)
{
mTitle.Truncate();
AppendUTF16toUTF8(aTitle, mTitle);
return NS_OK;
}
NS_IMETHODIMP nsDeviceContextSpecGTK::EndDocument()
{
if (mToPrinter) {
// At this point, we might have a GtkPrinter set up in nsPrintSettingsGTK,
// or we might not. In the single-process case, we probably will, as this
// is populated by the print settings dialog, or set to the default
// printer.
// In the multi-process case, we proxy the print settings dialog over to
// the parent process, and only get the name of the printer back on the
// content process side. In that case, we need to enumerate the printers
// on the content side, and find a printer with a matching name.
GtkPrinter* printer = mPrintSettings->GetGtkPrinter();
if (printer) {
// We have a printer, so we can print right away.
nsDeviceContextSpecGTK::StartPrintJob(this, printer);
} else {
// We don't have a printer. We have to enumerate the printers and find
// one with a matching name.
nsCOMPtr<nsIRunnable> event =
NS_NewRunnableMethod(this, &nsDeviceContextSpecGTK::EnumeratePrinters);
NS_DispatchToCurrentThread(event);
}
} 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();
}
}
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