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 "content/public/browser/content_browser_client.h"
   9 #include "content/public/common/content_client.h"
  10 #include "ppapi/c/pp_errors.h"
  11 #include "printing/printing_context.h"
  12 #include "printing/units.h"
  13
  14 namespace content {
  15
  16 namespace {
  17
  18 #if defined(ENABLE_PRINT_PREVIEW)
  19 // Print units conversion functions.
  20 int32_t DeviceUnitsInPoints(int32_t device_units,
  21                             int32_t device_units_per_inch) {
  22   return printing::ConvertUnit(
  23       device_units, device_units_per_inch, printing::kPointsPerInch);
  24 }
  25
  26 PP_Size PrintSizeToPPPrintSize(const gfx::Size& print_size,
  27                                int32_t device_units_per_inch) {
  28   PP_Size result;
  29   result.width = DeviceUnitsInPoints(print_size.width(), device_units_per_inch);
  30   result.height =
  31       DeviceUnitsInPoints(print_size.height(), device_units_per_inch);
  32   return result;
  33 }
  34
  35 PP_Rect PrintAreaToPPPrintArea(const gfx::Rect& print_area,
  36                                int32_t device_units_per_inch) {
  37   PP_Rect result;
  38   result.point.x =
  39       DeviceUnitsInPoints(print_area.origin().x(), device_units_per_inch);
  40   result.point.y =
  41       DeviceUnitsInPoints(print_area.origin().y(), device_units_per_inch);
  42   result.size =
  43       PrintSizeToPPPrintSize(print_area.size(), device_units_per_inch);
  44   return result;
  45 }
  46
  47 class PrintingContextDelegate : public printing::PrintingContext::Delegate {
  48  public:
  49   // PrintingContext::Delegate methods.
  50   gfx::NativeView GetParentView() override { return NULL; }
  51   std::string GetAppLocale() override {
  52     return GetContentClient()->browser()->GetApplicationLocale();
  53   }
  54 };
  55
  56 PepperPrintSettingsManager::Result ComputeDefaultPrintSettings() {
  57   // This function should run on the UI thread because |PrintingContext| methods
  58   // call into platform APIs.
  59   DCHECK_CURRENTLY_ON(BrowserThread::UI);
  60
  61   PrintingContextDelegate delegate;
  62   scoped_ptr<printing::PrintingContext> context(
  63       printing::PrintingContext::Create(&delegate));
  64   if (!context.get() ||
  65       context->UseDefaultSettings() != printing::PrintingContext::OK) {
  66     return PepperPrintSettingsManager::Result(PP_PrintSettings_Dev(),
  67                                               PP_ERROR_FAILED);
  68   }
  69   const printing::PrintSettings& print_settings = context->settings();
  70   const printing::PageSetup& page_setup =
  71       print_settings.page_setup_device_units();
  72   int device_units_per_inch = print_settings.device_units_per_inch();
  73   if (device_units_per_inch <= 0) {
  74     return PepperPrintSettingsManager::Result(PP_PrintSettings_Dev(),
  75                                               PP_ERROR_FAILED);
  76   }
  77   PP_PrintSettings_Dev settings;
  78   settings.printable_area = PrintAreaToPPPrintArea(page_setup.printable_area(),
  79                                                    device_units_per_inch);
  80   settings.content_area =
  81       PrintAreaToPPPrintArea(page_setup.content_area(), device_units_per_inch);
  82   settings.paper_size =
  83       PrintSizeToPPPrintSize(page_setup.physical_size(), device_units_per_inch);
  84   settings.dpi = print_settings.dpi();
  85
  86   // The remainder of the attributes are hard-coded to the defaults as set
  87   // elsewhere.
  88   settings.orientation = PP_PRINTORIENTATION_NORMAL;
  89   settings.grayscale = PP_FALSE;
  90   settings.print_scaling_option = PP_PRINTSCALINGOPTION_SOURCE_SIZE;
  91
  92   // TODO(raymes): Should be computed in the same way as
  93   // |PluginInstance::GetPreferredPrintOutputFormat|.
  94   // |PP_PRINTOUTPUTFORMAT_PDF| is currently the only supported format though,
  95   // so just make it the default.
  96   settings.format = PP_PRINTOUTPUTFORMAT_PDF;
  97   return PepperPrintSettingsManager::Result(settings, PP_OK);
  98 }
  99 #else
 100 PepperPrintSettingsManager::Result ComputeDefaultPrintSettings() {
 101   return PepperPrintSettingsManager::Result(PP_PrintSettings_Dev(),
 102                                             PP_ERROR_NOTSUPPORTED);
 103 }
 104 #endif
 105
 106 }  // namespace
 107
 108 void PepperPrintSettingsManagerImpl::GetDefaultPrintSettings(
 109     PepperPrintSettingsManager::Callback callback) {
 110   BrowserThread::PostTaskAndReplyWithResult(
 111       BrowserThread::UI,
 112       FROM_HERE,
 113       base::Bind(ComputeDefaultPrintSettings),
 114       callback);
 115 }
 116
 117 }  // namespace content