content/browser/renderer_host/pepper/pepper_print_settings_manager.cc

   1 // Copyright (c) 2012 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 "content/browser/renderer_host/pepper/pepper_print_settings_manager.h"
   6
   7 #include "content/public/browser/browser_thread.h"
   8 #include "ppapi/c/pp_errors.h"
   9 #include "printing/printing_context.h"
  10 #include "printing/units.h"
  11
  12 namespace content {
  13
  14 namespace {
  15
  16 #if defined(ENABLE_FULL_PRINTING)
  17 // Print units conversion functions.
  18 int32_t DeviceUnitsInPoints(int32_t device_units,
  19                             int32_t device_units_per_inch) {
  20   return printing::ConvertUnit(
  21       device_units, device_units_per_inch, printing::kPointsPerInch);
  22 }
  23
  24 PP_Size PrintSizeToPPPrintSize(const gfx::Size& print_size,
  25                                int32_t device_units_per_inch) {
  26   PP_Size result;
  27   result.width = DeviceUnitsInPoints(print_size.width(), device_units_per_inch);
  28   result.height =
  29       DeviceUnitsInPoints(print_size.height(), device_units_per_inch);
  30   return result;
  31 }
  32
  33 PP_Rect PrintAreaToPPPrintArea(const gfx::Rect& print_area,
  34                                int32_t device_units_per_inch) {
  35   PP_Rect result;
  36   result.point.x =
  37       DeviceUnitsInPoints(print_area.origin().x(), device_units_per_inch);
  38   result.point.y =
  39       DeviceUnitsInPoints(print_area.origin().y(), device_units_per_inch);
  40   result.size =
  41       PrintSizeToPPPrintSize(print_area.size(), device_units_per_inch);
  42   return result;
  43 }
  44
  45 PepperPrintSettingsManager::Result ComputeDefaultPrintSettings() {
  46   // This function should run on the UI thread because |PrintingContext| methods
  47   // call into platform APIs.
  48   DCHECK_CURRENTLY_ON(BrowserThread::UI);
  49   scoped_ptr<printing::PrintingContext> context(
  50       printing::PrintingContext::Create(std::string()));
  51   if (!context.get() ||
  52       context->UseDefaultSettings() != printing::PrintingContext::OK) {
  53     return PepperPrintSettingsManager::Result(PP_PrintSettings_Dev(),
  54                                               PP_ERROR_FAILED);
  55   }
  56   const printing::PrintSettings& print_settings = context->settings();
  57   const printing::PageSetup& page_setup =
  58       print_settings.page_setup_device_units();
  59   int device_units_per_inch = print_settings.device_units_per_inch();
  60   if (device_units_per_inch <= 0) {
  61     return PepperPrintSettingsManager::Result(PP_PrintSettings_Dev(),
  62                                               PP_ERROR_FAILED);
  63   }
  64   PP_PrintSettings_Dev settings;
  65   settings.printable_area = PrintAreaToPPPrintArea(page_setup.printable_area(),
  66                                                    device_units_per_inch);
  67   settings.content_area =
  68       PrintAreaToPPPrintArea(page_setup.content_area(), device_units_per_inch);
  69   settings.paper_size =
  70       PrintSizeToPPPrintSize(page_setup.physical_size(), device_units_per_inch);
  71   settings.dpi = print_settings.dpi();
  72
  73   // The remainder of the attributes are hard-coded to the defaults as set
  74   // elsewhere.
  75   settings.orientation = PP_PRINTORIENTATION_NORMAL;
  76   settings.grayscale = PP_FALSE;
  77   settings.print_scaling_option = PP_PRINTSCALINGOPTION_SOURCE_SIZE;
  78
  79   // TODO(raymes): Should be computed in the same way as
  80   // |PluginInstance::GetPreferredPrintOutputFormat|.
  81   // |PP_PRINTOUTPUTFORMAT_PDF| is currently the only supported format though,
  82   // so just make it the default.
  83   settings.format = PP_PRINTOUTPUTFORMAT_PDF;
  84   return PepperPrintSettingsManager::Result(settings, PP_OK);
  85 }
  86 #else
  87 PepperPrintSettingsManager::Result ComputeDefaultPrintSettings() {
  88   return PepperPrintSettingsManager::Result(PP_PrintSettings_Dev(),
  89                                             PP_ERROR_NOTSUPPORTED);
  90 }
  91 #endif
  92
  93 }  // namespace
  94
  95 void PepperPrintSettingsManagerImpl::GetDefaultPrintSettings(
  96     PepperPrintSettingsManager::Callback callback) {
  97   BrowserThread::PostTaskAndReplyWithResult(
  98       BrowserThread::UI,
  99       FROM_HERE,
 100       base::Bind(ComputeDefaultPrintSettings),
 101       callback);
 102 }
 103
 104 }  // namespace content