chrome/browser/ui/libgtk2ui/printing_gtk2_util.cc

   1 // Copyright 2014 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 "chrome/browser/ui/libgtk2ui/printing_gtk2_util.h"
   6
   7 #include <gtk/gtk.h>
   8 #include <gtk/gtkunixprint.h>
   9
  10 #include "base/strings/string16.h"
  11 #include "base/strings/utf_string_conversions.h"
  12 #include "printing/print_settings.h"
  13 #include "printing/printing_context_linux.h"
  14 #include "printing/units.h"
  15
  16 namespace {
  17
  18 const double kTopMarginInInch = 0.25;
  19 const double kBottomMarginInInch = 0.56;
  20 const double kLeftMarginInInch = 0.25;
  21 const double kRightMarginInInch = 0.25;
  22
  23 }  // namespace
  24
  25 gfx::Size GetPdfPaperSizeDeviceUnitsGtk(
  26     printing::PrintingContextLinux* context) {
  27   GtkPageSetup* page_setup = gtk_page_setup_new();
  28
  29   gfx::SizeF paper_size(
  30       gtk_page_setup_get_paper_width(page_setup, GTK_UNIT_INCH),
  31       gtk_page_setup_get_paper_height(page_setup, GTK_UNIT_INCH));
  32
  33   g_object_unref(page_setup);
  34
  35   const printing::PrintSettings& settings = context->settings();
  36
  37   return gfx::Size(
  38       paper_size.width() * settings.device_units_per_inch(),
  39       paper_size.height() * settings.device_units_per_inch());
  40 }
  41
  42 void InitPrintSettingsGtk(GtkPrintSettings* settings,
  43                           GtkPageSetup* page_setup,
  44                           printing::PrintSettings* print_settings) {
  45   DCHECK(settings);
  46   DCHECK(page_setup);
  47   DCHECK(print_settings);
  48
  49   base::string16 name(base::UTF8ToUTF16(static_cast<const char*>(
  50       gtk_print_settings_get_printer(settings))));
  51   print_settings->set_device_name(name);
  52
  53   gfx::Size physical_size_device_units;
  54   gfx::Rect printable_area_device_units;
  55   int dpi = gtk_print_settings_get_resolution(settings);
  56   if (dpi) {
  57     // Initialize page_setup_device_units_.
  58     physical_size_device_units.SetSize(
  59         gtk_page_setup_get_paper_width(page_setup, GTK_UNIT_INCH) * dpi,
  60         gtk_page_setup_get_paper_height(page_setup, GTK_UNIT_INCH) * dpi);
  61     printable_area_device_units.SetRect(
  62         gtk_page_setup_get_left_margin(page_setup, GTK_UNIT_INCH) * dpi,
  63         gtk_page_setup_get_top_margin(page_setup, GTK_UNIT_INCH) * dpi,
  64         gtk_page_setup_get_page_width(page_setup, GTK_UNIT_INCH) * dpi,
  65         gtk_page_setup_get_page_height(page_setup, GTK_UNIT_INCH) * dpi);
  66   } else {
  67     // Use default values if we cannot get valid values from the print dialog.
  68     dpi = printing::kPixelsPerInch;
  69     double page_width_in_pixel = printing::kLetterWidthInch * dpi;
  70     double page_height_in_pixel = printing::kLetterHeightInch * dpi;
  71     physical_size_device_units.SetSize(
  72         static_cast<int>(page_width_in_pixel),
  73         static_cast<int>(page_height_in_pixel));
  74     printable_area_device_units.SetRect(
  75         static_cast<int>(kLeftMarginInInch * dpi),
  76         static_cast<int>(kTopMarginInInch * dpi),
  77         page_width_in_pixel - (kLeftMarginInInch + kRightMarginInInch) * dpi,
  78         page_height_in_pixel - (kTopMarginInInch + kBottomMarginInInch) * dpi);
  79   }
  80
  81   print_settings->set_dpi(dpi);
  82
  83   // Note: With the normal GTK print dialog, when the user selects the landscape
  84   // orientation, all that does is change the paper size. Which seems to be
  85   // enough to render the right output and send it to the printer.
  86   // The orientation value stays as portrait and does not actually affect
  87   // printing.
  88   // Thus this is only useful in print preview mode, where we manually set the
  89   // orientation and change the paper size ourselves.
  90   GtkPageOrientation orientation = gtk_print_settings_get_orientation(settings);
  91   // Set before SetPrinterPrintableArea to make it flip area if necessary.
  92   print_settings->SetOrientation(orientation == GTK_PAGE_ORIENTATION_LANDSCAPE);
  93   DCHECK_EQ(print_settings->device_units_per_inch(), dpi);
  94   print_settings->SetPrinterPrintableArea(physical_size_device_units,
  95                                           printable_area_device_units,
  96                                           true);
  97 }