printing/print_settings_initializer_win.cc

// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "printing/print_settings_initializer_win.h"

#include <windows.h>

#include "printing/print_settings.h"

namespace printing {

// static
void PrintSettingsInitializerWin::InitPrintSettings(
    HDC hdc,
    const DEVMODE& dev_mode,
    PrintSettings* print_settings) {
  DCHECK(hdc);
  DCHECK(print_settings);
  print_settings->SetOrientation(dev_mode.dmOrientation == DMORIENT_LANDSCAPE);

  int dpi = GetDeviceCaps(hdc, LOGPIXELSX);
  print_settings->set_dpi(dpi);
  const int kAlphaCaps = SB_CONST_ALPHA | SB_PIXEL_ALPHA;
  print_settings->set_supports_alpha_blend(
    (GetDeviceCaps(hdc, SHADEBLENDCAPS) & kAlphaCaps) == kAlphaCaps);
  // No printer device is known to advertise different dpi in X and Y axis; even
  // the fax device using the 200x100 dpi setting. It's ought to break so many
  // applications that it's not even needed to care about. WebKit doesn't
  // support different dpi settings in X and Y axis.
  DCHECK_EQ(dpi, GetDeviceCaps(hdc, LOGPIXELSY));

  DCHECK_EQ(GetDeviceCaps(hdc, SCALINGFACTORX), 0);
  DCHECK_EQ(GetDeviceCaps(hdc, SCALINGFACTORY), 0);

  // Initialize page_setup_device_units_.
  gfx::Size physical_size_device_units(GetDeviceCaps(hdc, PHYSICALWIDTH),
                                       GetDeviceCaps(hdc, PHYSICALHEIGHT));
  gfx::Rect printable_area_device_units(GetDeviceCaps(hdc, PHYSICALOFFSETX),
                                        GetDeviceCaps(hdc, PHYSICALOFFSETY),
                                        GetDeviceCaps(hdc, HORZRES),
                                        GetDeviceCaps(hdc, VERTRES));

  // Sanity check the printable_area: we've seen crashes caused by a printable
  // area rect of 0, 0, 0, 0, so it seems some drivers don't set it.
  if (printable_area_device_units.IsEmpty() ||
      !gfx::Rect(physical_size_device_units).Contains(
          printable_area_device_units)) {
    printable_area_device_units = gfx::Rect(physical_size_device_units);
  }
  DCHECK_EQ(print_settings->device_units_per_inch(), dpi);
  print_settings->SetPrinterPrintableArea(physical_size_device_units,
                                          printable_area_device_units,
                                          false);
}

}  // namespace printing