Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 673 insertions, 0 deletions

diff --git a/widget/windows/nsDeviceContextSpecWin.cpp b/widget/windows/nsDeviceContextSpecWin.cpp
new file mode 100644
index 0000000000..9382098acc
--- /dev/null
+++ b/widget/windows/nsDeviceContextSpecWin.cpp
@@ -0,0 +1,673 @@
+/* -*- 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 "nsDeviceContextSpecWin.h"
+
+#include "mozilla/ArrayUtils.h"
+#include "mozilla/gfx/PrintPromise.h"
+#include "mozilla/gfx/PrintTargetPDF.h"
+#include "mozilla/gfx/PrintTargetWindows.h"
+#include "mozilla/Logging.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/Telemetry.h"
+#include "nsAnonymousTemporaryFile.h"
+
+#include <wchar.h>
+#include <windef.h>
+#include <winspool.h>
+
+#include "nsIWidget.h"
+
+#include "nsTArray.h"
+#include "nsIPrintSettingsWin.h"
+
+#include "nsComponentManagerUtils.h"
+#include "nsPrinterWin.h"
+#include "nsReadableUtils.h"
+#include "nsString.h"
+
+#include "gfxWindowsSurface.h"
+
+#include "nsIFileStreams.h"
+#include "nsWindowsHelpers.h"
+
+#include "mozilla/gfx/Logging.h"
+
+#ifdef MOZ_ENABLE_SKIA_PDF
+#  include "mozilla/gfx/PrintTargetSkPDF.h"
+#  include "mozilla/gfx/PrintTargetEMF.h"
+#  include "nsIUUIDGenerator.h"
+#  include "nsDirectoryServiceDefs.h"
+#  include "nsPrintfCString.h"
+#  include "nsThreadUtils.h"
+#endif
+
+extern mozilla::LazyLogModule gPrintingLog;
+#define PR_PL(_p1) MOZ_LOG(gPrintingLog, mozilla::LogLevel::Debug, _p1)
+
+using namespace mozilla;
+using namespace mozilla::gfx;
+
+#ifdef MOZ_ENABLE_SKIA_PDF
+using namespace mozilla::widget;
+#endif
+
+static const wchar_t kDriverName[] = L"WINSPOOL";
+
+//----------------------------------------------------------------------------------
+//---------------
+// static members
+//----------------------------------------------------------------------------------
+nsDeviceContextSpecWin::nsDeviceContextSpecWin() = default;
+
+//----------------------------------------------------------------------------------
+
+NS_IMPL_ISUPPORTS(nsDeviceContextSpecWin, nsIDeviceContextSpec)
+
+nsDeviceContextSpecWin::~nsDeviceContextSpecWin() {
+  SetDevMode(nullptr);
+
+  if (mTempFile) {
+    mTempFile->Remove(/* recursive = */ false);
+  }
+
+  if (nsCOMPtr<nsIPrintSettingsWin> ps = do_QueryInterface(mPrintSettings)) {
+    ps->SetDeviceName(u""_ns);
+    ps->SetDriverName(u""_ns);
+    ps->SetDevMode(nullptr);
+  }
+}
+
+static bool GetDefaultPrinterName(nsAString& aDefaultPrinterName) {
+  DWORD length = 0;
+  GetDefaultPrinterW(nullptr, &length);
+
+  if (length) {
+    aDefaultPrinterName.SetLength(length);
+    if (GetDefaultPrinterW((LPWSTR)aDefaultPrinterName.BeginWriting(),
+                           &length)) {
+      // `length` includes the terminating null, so we subtract that from our
+      // string length.
+      aDefaultPrinterName.SetLength(length - 1);
+      PR_PL(("DEFAULT PRINTER [%s]\n",
+             NS_ConvertUTF16toUTF8(aDefaultPrinterName).get()));
+      return true;
+    }
+  }
+
+  aDefaultPrinterName.Truncate();
+  PR_PL(("NO DEFAULT PRINTER\n"));
+  return false;
+}
+
+//----------------------------------------------------------------------------------
+NS_IMETHODIMP nsDeviceContextSpecWin::Init(nsIPrintSettings* aPrintSettings,
+                                           bool aIsPrintPreview) {
+  mPrintSettings = aPrintSettings;
+
+  // Get the Printer Name to be used and output format.
+  nsAutoString printerName;
+  if (mPrintSettings) {
+    mOutputFormat = mPrintSettings->GetOutputFormat();
+    mPrintSettings->GetPrinterName(printerName);
+  }
+
+  // If there is no name then use the default printer
+  if (printerName.IsEmpty()) {
+    GetDefaultPrinterName(printerName);
+  }
+
+  // Gather telemetry on the print target type.
+  //
+  // Unfortunately, if we're not using our own internal save-to-pdf codepaths,
+  // there isn't a good way to determine whether a print is going to be to a
+  // physical printer or to a file or some other non-physical output. We do our
+  // best by checking for what seems to be the most common save-to-PDF virtual
+  // printers.
+  //
+  // We use StringBeginsWith below, since printer names are often followed by a
+  // version number or other product differentiating string.  (True for doPDF,
+  // novaPDF, PDF-XChange and Soda PDF, for example.)
+  if (mOutputFormat == nsIPrintSettings::kOutputFormatPDF) {
+    Telemetry::ScalarAdd(Telemetry::ScalarID::PRINTING_TARGET_TYPE,
+                         u"pdf_file"_ns, 1);
+  } else if (StringBeginsWith(printerName, u"Microsoft Print to PDF"_ns) ||
+             StringBeginsWith(printerName, u"Adobe PDF"_ns) ||
+             StringBeginsWith(printerName, u"Bullzip PDF Printer"_ns) ||
+             StringBeginsWith(printerName, u"CutePDF Writer"_ns) ||
+             StringBeginsWith(printerName, u"doPDF"_ns) ||
+             StringBeginsWith(printerName, u"Foxit Reader PDF Printer"_ns) ||
+             StringBeginsWith(printerName, u"Nitro PDF Creator"_ns) ||
+             StringBeginsWith(printerName, u"novaPDF"_ns) ||
+             StringBeginsWith(printerName, u"PDF-XChange"_ns) ||
+             StringBeginsWith(printerName, u"PDF24 PDF"_ns) ||
+             StringBeginsWith(printerName, u"PDFCreator"_ns) ||
+             StringBeginsWith(printerName, u"PrimoPDF"_ns) ||
+             StringBeginsWith(printerName, u"Soda PDF"_ns) ||
+             StringBeginsWith(printerName, u"Solid PDF Creator"_ns) ||
+             StringBeginsWith(printerName,
+                              u"Universal Document Converter"_ns)) {
+    Telemetry::ScalarAdd(Telemetry::ScalarID::PRINTING_TARGET_TYPE,
+                         u"pdf_file"_ns, 1);
+  } else if (printerName.EqualsLiteral("Microsoft XPS Document Writer")) {
+    Telemetry::ScalarAdd(Telemetry::ScalarID::PRINTING_TARGET_TYPE,
+                         u"xps_file"_ns, 1);
+  } else {
+    nsAString::const_iterator start, end;
+    printerName.BeginReading(start);
+    printerName.EndReading(end);
+    if (CaseInsensitiveFindInReadable(u"pdf"_ns, start, end)) {
+      Telemetry::ScalarAdd(Telemetry::ScalarID::PRINTING_TARGET_TYPE,
+                           u"pdf_unknown"_ns, 1);
+    } else {
+      Telemetry::ScalarAdd(Telemetry::ScalarID::PRINTING_TARGET_TYPE,
+                           u"unknown"_ns, 1);
+    }
+  }
+
+  nsresult rv = NS_ERROR_GFX_PRINTER_NO_PRINTER_AVAILABLE;
+  if (aPrintSettings) {
+#ifdef MOZ_ENABLE_SKIA_PDF
+    nsAutoString printViaPdf;
+    Preferences::GetString("print.print_via_pdf_encoder", printViaPdf);
+    if (printViaPdf.EqualsLiteral("skia-pdf")) {
+      mPrintViaSkPDF = true;
+    }
+#endif
+
+    // If we're in the child or we're printing to PDF we only need information
+    // from the print settings.
+    if (XRE_IsContentProcess() ||
+        mOutputFormat == nsIPrintSettings::kOutputFormatPDF) {
+      return NS_OK;
+    }
+
+    nsCOMPtr<nsIPrintSettingsWin> psWin(do_QueryInterface(aPrintSettings));
+    if (psWin) {
+      nsAutoString deviceName;
+      nsAutoString driverName;
+      psWin->GetDeviceName(deviceName);
+      psWin->GetDriverName(driverName);
+
+      LPDEVMODEW devMode;
+      psWin->GetDevMode(&devMode);  // creates new memory (makes a copy)
+
+      if (!deviceName.IsEmpty() && !driverName.IsEmpty() && devMode) {
+        // Scaling is special, it is one of the few
+        // devMode items that we control in layout
+        if (devMode->dmFields & DM_SCALE) {
+          double scale = double(devMode->dmScale) / 100.0f;
+          if (scale != 1.0) {
+            aPrintSettings->SetScaling(scale);
+            devMode->dmScale = 100;
+          }
+        }
+
+        SetDeviceName(deviceName);
+        SetDriverName(driverName);
+        SetDevMode(devMode);
+
+        return NS_OK;
+      } else {
+        PR_PL(
+            ("***** nsDeviceContextSpecWin::Init - "
+             "deviceName/driverName/devMode was NULL!\n"));
+        if (devMode) ::HeapFree(::GetProcessHeap(), 0, devMode);
+      }
+    }
+  } else {
+    PR_PL(("***** nsDeviceContextSpecWin::Init - aPrintSettingswas NULL!\n"));
+  }
+
+  if (printerName.IsEmpty()) {
+    return rv;
+  }
+
+  return GetDataFromPrinter(printerName, mPrintSettings);
+}
+
+//----------------------------------------------------------
+
+already_AddRefed<PrintTarget> nsDeviceContextSpecWin::MakePrintTarget() {
+  NS_ASSERTION(mDevMode || mOutputFormat == nsIPrintSettings::kOutputFormatPDF,
+               "DevMode can't be NULL here unless we're printing to PDF.");
+
+#ifdef MOZ_ENABLE_SKIA_PDF
+  if (mPrintViaSkPDF) {
+    double width, height;
+    mPrintSettings->GetEffectivePageSize(&width, &height);
+    if (width <= 0 || height <= 0) {
+      return nullptr;
+    }
+
+    // convert twips to points
+    width /= TWIPS_PER_POINT_FLOAT;
+    height /= TWIPS_PER_POINT_FLOAT;
+    IntSize size = IntSize::Ceil(width, height);
+
+    if (mOutputFormat == nsIPrintSettings::kOutputFormatPDF) {
+      nsString filename;
+      // TODO(dshin):
+      // - Does this handle bug 1659470?
+      // - Should this code path be enabled, we should use temporary files and
+      // then move the file in `EndDocument()`.
+      mPrintSettings->GetToFileName(filename);
+
+      nsAutoCString printFile(NS_ConvertUTF16toUTF8(filename).get());
+      auto skStream = MakeUnique<SkFILEWStream>(printFile.get());
+      return PrintTargetSkPDF::CreateOrNull(std::move(skStream), size);
+    }
+
+    if (mDevMode) {
+      NS_WARNING_ASSERTION(!mDriverName.IsEmpty(), "No driver!");
+      HDC dc =
+          ::CreateDCW(mDriverName.get(), mDeviceName.get(), nullptr, mDevMode);
+      if (!dc) {
+        gfxCriticalError(gfxCriticalError::DefaultOptions(false))
+            << "Failed to create device context in GetSurfaceForPrinter";
+        return nullptr;
+      }
+      return PrintTargetEMF::CreateOrNull(dc, size);
+    }
+  }
+#endif
+
+  if (mOutputFormat == nsIPrintSettings::kOutputFormatPDF) {
+    double width, height;
+    mPrintSettings->GetEffectiveSheetSize(&width, &height);
+    if (width <= 0 || height <= 0) {
+      return nullptr;
+    }
+
+    // convert twips to points
+    width /= TWIPS_PER_POINT_FLOAT;
+    height /= TWIPS_PER_POINT_FLOAT;
+
+    auto stream = [&]() -> nsCOMPtr<nsIOutputStream> {
+      if (mPrintSettings->GetOutputDestination() ==
+          nsIPrintSettings::kOutputDestinationStream) {
+        nsCOMPtr<nsIOutputStream> out;
+        mPrintSettings->GetOutputStream(getter_AddRefs(out));
+        return out;
+      }
+
+      // Even if the destination may be a named path, write to a temp file -
+      // this is consistent with behaviour of `PrintTarget` on other platforms.
+      nsCOMPtr<nsIFile> file;
+      nsresult rv = NS_OpenAnonymousTemporaryNsIFile(getter_AddRefs(mTempFile));
+      file = mTempFile;
+
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return nullptr;
+      }
+
+      nsCOMPtr<nsIFileOutputStream> stream =
+          do_CreateInstance("@mozilla.org/network/file-output-stream;1");
+      if (NS_FAILED(stream->Init(file, -1, -1, 0))) {
+        return nullptr;
+      }
+      return stream;
+    }();
+
+    return PrintTargetPDF::CreateOrNull(stream, IntSize::Ceil(width, height));
+  }
+
+  if (mDevMode) {
+    NS_WARNING_ASSERTION(!mDriverName.IsEmpty(), "No driver!");
+    HDC dc =
+        ::CreateDCW(mDriverName.get(), mDeviceName.get(), nullptr, mDevMode);
+    if (!dc) {
+      gfxCriticalError(gfxCriticalError::DefaultOptions(false))
+          << "Failed to create device context in GetSurfaceForPrinter";
+      return nullptr;
+    }
+
+    // The PrintTargetWindows takes over ownership of this DC
+    return PrintTargetWindows::CreateOrNull(dc);
+  }
+
+  return nullptr;
+}
+
+RefPtr<PrintEndDocumentPromise> nsDeviceContextSpecWin::EndDocument() {
+  if (mPrintSettings->GetOutputDestination() !=
+          nsIPrintSettings::kOutputDestinationFile ||
+      mOutputFormat != nsIPrintSettings::kOutputFormatPDF) {
+    return PrintEndDocumentPromise::CreateAndResolve(true, __func__);
+  }
+
+#ifdef MOZ_ENABLE_SKIA_PDF
+  if (mPrintViaSkPDF) {
+    return PrintEndDocumentPromise::CreateAndResolve(true, __func__);
+  }
+#endif
+
+  MOZ_ASSERT(mTempFile, "No handle to temporary PDF file.");
+
+  nsAutoString targetPath;
+  mPrintSettings->GetToFileName(targetPath);
+
+  if (targetPath.IsEmpty()) {
+    return PrintEndDocumentPromise::CreateAndResolve(true, __func__);
+  }
+
+  // We still need to move the file to its actual destination.
+  nsCOMPtr<nsIFile> destFile;
+  auto rv = NS_NewLocalFile(targetPath, false, getter_AddRefs(destFile));
+  if (NS_FAILED(rv)) {
+    return PrintEndDocumentPromise::CreateAndReject(rv, __func__);
+  }
+
+  return nsIDeviceContextSpec::EndDocumentAsync(
+      __func__,
+      [destFile = std::move(destFile),
+       tempFile = std::move(mTempFile)]() -> nsresult {
+        nsAutoString destLeafName;
+        MOZ_TRY(destFile->GetLeafName(destLeafName));
+
+        nsCOMPtr<nsIFile> destDir;
+        MOZ_TRY(destFile->GetParent(getter_AddRefs(destDir)));
+
+        // This should be fine - Windows API calls usually prevent moving
+        // between different volumes (See Win32 API's `MOVEFILE_COPY_ALLOWED`
+        // flag), but we handle that down this call.
+        MOZ_TRY(tempFile->MoveTo(destDir, destLeafName));
+        return NS_OK;
+      });
+}
+
+//----------------------------------------------------------------------------------
+void nsDeviceContextSpecWin::SetDeviceName(const nsAString& aDeviceName) {
+  mDeviceName = aDeviceName;
+}
+
+//----------------------------------------------------------------------------------
+void nsDeviceContextSpecWin::SetDriverName(const nsAString& aDriverName) {
+  mDriverName = aDriverName;
+}
+
+//----------------------------------------------------------------------------------
+void nsDeviceContextSpecWin::SetDevMode(LPDEVMODEW aDevMode) {
+  if (mDevMode) {
+    ::HeapFree(::GetProcessHeap(), 0, mDevMode);
+  }
+
+  mDevMode = aDevMode;
+}
+
+//------------------------------------------------------------------
+void nsDeviceContextSpecWin::GetDevMode(LPDEVMODEW& aDevMode) {
+  aDevMode = mDevMode;
+}
+
+#define DISPLAY_LAST_ERROR
+
+//----------------------------------------------------------------------------------
+// Setup the object's data member with the selected printer's data
+nsresult nsDeviceContextSpecWin::GetDataFromPrinter(const nsAString& aName,
+                                                    nsIPrintSettings* aPS) {
+  nsresult rv = NS_ERROR_FAILURE;
+
+  nsHPRINTER hPrinter = nullptr;
+  const nsString& flat = PromiseFlatString(aName);
+  wchar_t* name =
+      (wchar_t*)flat.get();  // Windows APIs use non-const name argument
+
+  BOOL status = ::OpenPrinterW(name, &hPrinter, nullptr);
+  if (status) {
+    nsAutoPrinter autoPrinter(hPrinter);
+
+    LPDEVMODEW pDevMode;
+
+    // Allocate a buffer of the correct size.
+    LONG needed =
+        ::DocumentPropertiesW(nullptr, hPrinter, name, nullptr, nullptr, 0);
+    if (needed < 0) {
+      PR_PL(
+          ("**** nsDeviceContextSpecWin::GetDataFromPrinter - Couldn't get "
+           "size of DEVMODE using DocumentPropertiesW(pDeviceName = \"%s\"). "
+           "GetLastEror() = %08lx\n",
+           NS_ConvertUTF16toUTF8(aName).get(), GetLastError()));
+      return NS_ERROR_FAILURE;
+    }
+
+    // Some drivers do not return the correct size for their DEVMODE, so we
+    // over-allocate to try and compensate.
+    // (See https://bugzilla.mozilla.org/show_bug.cgi?id=1664530#c5)
+    needed *= 2;
+    pDevMode =
+        (LPDEVMODEW)::HeapAlloc(::GetProcessHeap(), HEAP_ZERO_MEMORY, needed);
+    if (!pDevMode) return NS_ERROR_FAILURE;
+
+    // Get the default DevMode for the printer and modify it for our needs.
+    LONG ret = ::DocumentPropertiesW(nullptr, hPrinter, name, pDevMode, nullptr,
+                                     DM_OUT_BUFFER);
+
+    if (ret == IDOK && aPS) {
+      nsCOMPtr<nsIPrintSettingsWin> psWin = do_QueryInterface(aPS);
+      MOZ_ASSERT(psWin);
+      psWin->CopyToNative(pDevMode);
+      // Sets back the changes we made to the DevMode into the Printer Driver
+      ret = ::DocumentPropertiesW(nullptr, hPrinter, name, pDevMode, pDevMode,
+                                  DM_IN_BUFFER | DM_OUT_BUFFER);
+
+      // We need to copy the final DEVMODE settings back to our print settings,
+      // because they may have been set from invalid prefs.
+      if (ret == IDOK) {
+        // We need to get information from the device as well.
+        nsAutoHDC printerDC(::CreateICW(kDriverName, name, nullptr, pDevMode));
+        if (NS_WARN_IF(!printerDC)) {
+          ::HeapFree(::GetProcessHeap(), 0, pDevMode);
+          return NS_ERROR_FAILURE;
+        }
+
+        psWin->CopyFromNative(printerDC, pDevMode);
+      }
+    }
+
+    if (ret != IDOK) {
+      ::HeapFree(::GetProcessHeap(), 0, pDevMode);
+      PR_PL(
+          ("***** nsDeviceContextSpecWin::GetDataFromPrinter - "
+           "DocumentProperties call failed code: %ld/0x%lx\n",
+           ret, ret));
+      DISPLAY_LAST_ERROR
+      return NS_ERROR_FAILURE;
+    }
+
+    SetDevMode(
+        pDevMode);  // cache the pointer and takes responsibility for the memory
+
+    SetDeviceName(aName);
+
+    SetDriverName(nsDependentString(kDriverName));
+
+    rv = NS_OK;
+  } else {
+    rv = NS_ERROR_GFX_PRINTER_NAME_NOT_FOUND;
+    PR_PL(
+        ("***** nsDeviceContextSpecWin::GetDataFromPrinter - Couldn't open "
+         "printer: [%s]\n",
+         NS_ConvertUTF16toUTF8(aName).get()));
+    DISPLAY_LAST_ERROR
+  }
+  return rv;
+}
+
+//***********************************************************
+//  Printer List
+//***********************************************************
+
+nsPrinterListWin::~nsPrinterListWin() = default;
+
+// Helper to get the array of PRINTER_INFO_4 records from the OS into a
+// caller-supplied byte array; returns the number of records present.
+static unsigned GetPrinterInfo4(nsTArray<BYTE>& aBuffer) {
+  const DWORD kLevel = 4;
+  DWORD needed = 0;
+  DWORD count = 0;
+  const DWORD kFlags = PRINTER_ENUM_LOCAL | PRINTER_ENUM_CONNECTIONS;
+  BOOL ok = ::EnumPrintersW(kFlags,
+                            nullptr,  // Name
+                            kLevel,   // Level
+                            nullptr,  // pPrinterEnum
+                            0,        // cbBuf (buffer size)
+                            &needed,  // Bytes needed in buffer
+                            &count);
+  if (needed > 0) {
+    if (!aBuffer.SetLength(needed, fallible)) {
+      return 0;
+    }
+    ok = ::EnumPrintersW(kFlags, nullptr, kLevel, aBuffer.Elements(),
+                         aBuffer.Length(), &needed, &count);
+  }
+  if (!ok) {
+    return 0;
+  }
+  return count;
+}
+
+nsTArray<nsPrinterListBase::PrinterInfo> nsPrinterListWin::Printers() const {
+  PR_PL(("nsPrinterListWin::Printers\n"));
+
+  AutoTArray<BYTE, 1024> buffer;
+  unsigned count = GetPrinterInfo4(buffer);
+
+  if (!count) {
+    PR_PL(("[No printers found]\n"));
+    return {};
+  }
+
+  const auto* printers =
+      reinterpret_cast<const _PRINTER_INFO_4W*>(buffer.Elements());
+  nsTArray<PrinterInfo> list;
+  for (unsigned i = 0; i < count; i++) {
+    // For LOCAL printers, we check whether OpenPrinter succeeds, and omit
+    // them from the list if not. This avoids presenting printers that the
+    // user cannot actually use (e.g. due to Windows permissions).
+    // For NETWORK printers, this check may block for a long time (waiting for
+    // network timeout), so we skip it; if the user tries to access a printer
+    // that isn't available, we'll have to show an error later.
+    // (We always need to be able to handle an error, anyhow, as the printer
+    // could get disconnected after we've created the list, for example.)
+    bool isAvailable = false;
+    if (printers[i].Attributes & PRINTER_ATTRIBUTE_NETWORK) {
+      isAvailable = true;
+    } else if (printers[i].Attributes & PRINTER_ATTRIBUTE_LOCAL) {
+      HANDLE handle;
+      if (::OpenPrinterW(printers[i].pPrinterName, &handle, nullptr)) {
+        ::ClosePrinter(handle);
+        isAvailable = true;
+      }
+    }
+    if (isAvailable) {
+      list.AppendElement(PrinterInfo{nsString(printers[i].pPrinterName)});
+      PR_PL(("Printer Name: %s\n",
+             NS_ConvertUTF16toUTF8(printers[i].pPrinterName).get()));
+    }
+  }
+
+  if (!count) {
+    PR_PL(("[No usable printers found]\n"));
+    return {};
+  }
+
+  return list;
+}
+
+Maybe<nsPrinterListBase::PrinterInfo> nsPrinterListWin::PrinterByName(
+    nsString aName) const {
+  Maybe<PrinterInfo> rv;
+
+  AutoTArray<BYTE, 1024> buffer;
+  unsigned count = GetPrinterInfo4(buffer);
+
+  const auto* printers =
+      reinterpret_cast<const _PRINTER_INFO_4W*>(buffer.Elements());
+  for (unsigned i = 0; i < count; ++i) {
+    if (aName.Equals(nsString(printers[i].pPrinterName))) {
+      rv.emplace(PrinterInfo{aName});
+      break;
+    }
+  }
+
+  return rv;
+}
+
+Maybe<nsPrinterListBase::PrinterInfo> nsPrinterListWin::PrinterBySystemName(
+    nsString aName) const {
+  return PrinterByName(std::move(aName));
+}
+
+RefPtr<nsIPrinter> nsPrinterListWin::CreatePrinter(PrinterInfo aInfo) const {
+  return nsPrinterWin::Create(mCommonPaperInfo, std::move(aInfo.mName));
+}
+
+nsresult nsPrinterListWin::SystemDefaultPrinterName(nsAString& aName) const {
+  if (!GetDefaultPrinterName(aName)) {
+    NS_WARNING("Uh oh, GetDefaultPrinterName failed");
+    // Indicate failure by leaving aName untouched, i.e. the empty string.
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPrinterListWin::InitPrintSettingsFromPrinter(
+    const nsAString& aPrinterName, nsIPrintSettings* aPrintSettings) {
+  NS_ENSURE_ARG_POINTER(aPrintSettings);
+
+  if (aPrinterName.IsEmpty()) {
+    return NS_OK;
+  }
+
+  // When printing to PDF on Windows there is no associated printer driver.
+  int16_t outputFormat = aPrintSettings->GetOutputFormat();
+  if (outputFormat == nsIPrintSettings::kOutputFormatPDF) {
+    return NS_OK;
+  }
+
+  RefPtr<nsDeviceContextSpecWin> devSpecWin = new nsDeviceContextSpecWin();
+  if (!devSpecWin) return NS_ERROR_OUT_OF_MEMORY;
+
+  // If the settings have already been initialized from prefs then pass these to
+  // GetDataFromPrinter, so that they are saved to the printer.
+  bool initializedFromPrefs;
+  nsresult rv =
+      aPrintSettings->GetIsInitializedFromPrefs(&initializedFromPrefs);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+  if (initializedFromPrefs) {
+    // If we pass in print settings to GetDataFromPrinter it already copies
+    // things back to the settings, so we can return here.
+    return devSpecWin->GetDataFromPrinter(aPrinterName, aPrintSettings);
+  }
+
+  devSpecWin->GetDataFromPrinter(aPrinterName);
+
+  LPDEVMODEW devmode;
+  devSpecWin->GetDevMode(devmode);
+  if (NS_WARN_IF(!devmode)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  aPrintSettings->SetPrinterName(aPrinterName);
+
+  // We need to get information from the device as well.
+  const nsString& flat = PromiseFlatString(aPrinterName);
+  char16ptr_t printerName = flat.get();
+  HDC dc = ::CreateICW(kDriverName, printerName, nullptr, devmode);
+  if (NS_WARN_IF(!dc)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  nsCOMPtr<nsIPrintSettingsWin> psWin = do_QueryInterface(aPrintSettings);
+  MOZ_ASSERT(psWin);
+  psWin->CopyFromNative(dc, devmode);
+  ::DeleteDC(dc);
+
+  return NS_OK;
+}