Implement browser side of PPB_Printing resource.

content/browser/renderer_host/pepper/pepper_print_settings_manager.cc

+// Copyright (c) 2012 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 "content/browser/renderer_host/pepper/pepper_print_settings_manager.h"
+
+#include "content/public/browser/browser_thread.h"
+#include "ppapi/c/pp_errors.h"
+#include "printing/printing_context.h"
+#include "printing/units.h"
+
+namespace content {
+
+namespace {
+
+#if defined(ENABLE_PRINTING)
+// Print units conversion functions.
+int32_t DeviceUnitsInPoints(int32_t device_units,
+                            int32_t device_units_per_inch) {
+  return printing::ConvertUnit(device_units, printing::kPointsPerInch,
+                               device_units_per_inch);
+}
+
+PP_Size PrintSizeToPPPrintSize(const gfx::Size& print_size,
+                               int32_t device_units_per_inch) {
+  PP_Size result;
+  result.width = DeviceUnitsInPoints(print_size.width(), device_units_per_inch);
+  result.height = DeviceUnitsInPoints(print_size.height(),
+                                      device_units_per_inch);
+  return result;
+}
+
+PP_Rect PrintAreaToPPPrintArea(const gfx::Rect& print_area,
+                               int32_t device_units_per_inch) {
+  PP_Rect result;
+  result.point.x = DeviceUnitsInPoints(print_area.origin().x(),
+                                       device_units_per_inch);
+  result.point.y = DeviceUnitsInPoints(print_area.origin().y(),
+                                       device_units_per_inch);
+  result.size = PrintSizeToPPPrintSize(print_area.size(),
+                                       device_units_per_inch);
+  return result;
+}
+
+PepperPrintSettingsManager::Result ComputeDefaultPrintSettings() {
+  // This function should run on the UI thread because |PrintingContext| methods
+  // call into platform APIs.
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  scoped_ptr<printing::PrintingContext> context(
+  printing::PrintingContext::Create(std::string()));
+  if (!context.get()) {
+    return PepperPrintSettingsManager::Result(PP_PrintSettings_Dev(),
+                                              PP_ERROR_FAILED);
+  }
+  context->UseDefaultSettings();
+  const printing::PrintSettings& print_settings = context->settings();
+  const printing::PageSetup& page_setup =
+       print_settings.page_setup_device_units();
+  int device_units_per_inch = print_settings.device_units_per_inch();
+  PP_PrintSettings_Dev settings;
+  settings.printable_area = PrintAreaToPPPrintArea(
+      page_setup.printable_area(), device_units_per_inch);
+  settings.content_area = PrintAreaToPPPrintArea(
+      page_setup.content_area(), device_units_per_inch);
+  settings.paper_size = PrintSizeToPPPrintSize(
+      page_setup.physical_size(), device_units_per_inch);
+  settings.dpi = print_settings.dpi();
+
+  // The remainder of the attributes are hard-coded to the defaults as set
+  // elsewhere.
+  settings.orientation = PP_PRINTORIENTATION_NORMAL;
+  settings.grayscale = PP_FALSE;
+  settings.print_scaling_option = PP_PRINTSCALINGOPTION_SOURCE_SIZE;
+
+  // TODO(raymes): Should be computed in the same way as
+  // |PluginInstance::GetPreferredPrintOutputFormat|.
+  // |PP_PRINTOUTPUTFORMAT_PDF| is currently the only supported format though,
+  // so just make it the default.
+  settings.format = PP_PRINTOUTPUTFORMAT_PDF;
+  return PepperPrintSettingsManager::Result(settings, PP_OK);
+}
+#else
+PepperPrintSettingsManager::Result ComputeDefaultPrintSettings() {
+  return PepperPrintSettingsManager::Result(PP_PrintSettings_Dev(),
+                                            PP_ERROR_NOTSUPPORTED);
+}
+#endif
+
+}  // namespace
+
+void PepperPrintSettingsManagerImpl::GetDefaultPrintSettings(
+    PepperPrintSettingsManager::Callback callback) {
+  BrowserThread::PostTaskAndReplyWithResult(BrowserThread::UI, FROM_HERE,
+      base::Bind(ComputeDefaultPrintSettings), callback);
+}
+
+}  // namespace content