printing/print_settings_initializer_win.cc

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "printing/print_settings_initializer_win.h"
   6
   7 #include <windows.h>
   8
   9 #include "printing/print_settings.h"
  10
  11 namespace printing {
  12
  13 // static
  14 void PrintSettingsInitializerWin::InitPrintSettings(
  15     HDC hdc,
  16     const DEVMODE& dev_mode,
  17     PrintSettings* print_settings) {
  18   DCHECK(hdc);
  19   DCHECK(print_settings);
  20   print_settings->SetOrientation(dev_mode.dmOrientation == DMORIENT_LANDSCAPE);
  21
  22   int dpi = GetDeviceCaps(hdc, LOGPIXELSX);
  23   print_settings->set_dpi(dpi);
  24   const int kAlphaCaps = SB_CONST_ALPHA | SB_PIXEL_ALPHA;
  25   print_settings->set_supports_alpha_blend(
  26     (GetDeviceCaps(hdc, SHADEBLENDCAPS) & kAlphaCaps) == kAlphaCaps);
  27   // No printer device is known to advertise different dpi in X and Y axis; even
  28   // the fax device using the 200x100 dpi setting. It's ought to break so many
  29   // applications that it's not even needed to care about. WebKit doesn't
  30   // support different dpi settings in X and Y axis.
  31   DCHECK_EQ(dpi, GetDeviceCaps(hdc, LOGPIXELSY));
  32
  33   DCHECK_EQ(GetDeviceCaps(hdc, SCALINGFACTORX), 0);
  34   DCHECK_EQ(GetDeviceCaps(hdc, SCALINGFACTORY), 0);
  35
  36   // Initialize page_setup_device_units_.
  37   gfx::Size physical_size_device_units(GetDeviceCaps(hdc, PHYSICALWIDTH),
  38                                        GetDeviceCaps(hdc, PHYSICALHEIGHT));
  39   gfx::Rect printable_area_device_units(GetDeviceCaps(hdc, PHYSICALOFFSETX),
  40                                         GetDeviceCaps(hdc, PHYSICALOFFSETY),
  41                                         GetDeviceCaps(hdc, HORZRES),
  42                                         GetDeviceCaps(hdc, VERTRES));
  43
  44   // Sanity check the printable_area: we've seen crashes caused by a printable
  45   // area rect of 0, 0, 0, 0, so it seems some drivers don't set it.
  46   if (printable_area_device_units.IsEmpty() ||
  47       !gfx::Rect(physical_size_device_units).Contains(
  48           printable_area_device_units)) {
  49     printable_area_device_units = gfx::Rect(physical_size_device_units);
  50   }
  51   DCHECK_EQ(print_settings->device_units_per_inch(), dpi);
  52   print_settings->SetPrinterPrintableArea(physical_size_device_units,
  53                                           printable_area_device_units,
  54                                           false);
  55 }
  56
  57 }  // namespace printing