widget/nsIDeviceContextSpec.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #include "nsIDeviceContextSpec.h"
   7
   8 #include "gfxPoint.h"
   9 #include "nsIPrintSettings.h"
  10
  11 // We have some platform specific code here rather than in the appropriate
  12 // nsIDeviceContextSpec subclass. We structure the code this way so that
  13 // nsIDeviceContextSpecProxy gets the correct behavior without us having to
  14 // instantiate a platform specific nsIDeviceContextSpec subclass in content
  15 // processes. That is necessary for sandboxing.
  16
  17 float nsIDeviceContextSpec::GetPrintingScale() {
  18 #ifdef XP_WIN
  19   if (mPrintSettings->GetOutputFormat() != nsIPrintSettings::kOutputFormatPDF
  20 #  ifdef MOZ_ENABLE_SKIA_PDF
  21       && !mPrintViaSkPDF
  22 #  endif
  23   ) {
  24     // The print settings will have the resolution stored from the real device.
  25     int32_t resolution;
  26     mPrintSettings->GetResolution(&resolution);
  27     return float(resolution) / GetDPI();
  28   }
  29 #endif
  30
  31   return 72.0f / GetDPI();
  32 }
  33
  34 gfxPoint nsIDeviceContextSpec::GetPrintingTranslate() {
  35 #ifdef XP_WIN
  36   // The underlying surface on windows is the size of the printable region. When
  37   // the region is smaller than the actual paper size the (0, 0) coordinate
  38   // refers top-left of that unwritable region. To instead have (0, 0) become
  39   // the top-left of the actual paper, translate it's coordinate system by the
  40   // unprintable region's width.
  41   double marginTop, marginLeft;
  42   mPrintSettings->GetUnwriteableMarginTop(&marginTop);
  43   mPrintSettings->GetUnwriteableMarginLeft(&marginLeft);
  44   int32_t resolution;
  45   mPrintSettings->GetResolution(&resolution);
  46   return gfxPoint(-marginLeft * resolution, -marginTop * resolution);
  47 #else
  48   return gfxPoint(0, 0);
  49 #endif
  50 }