win8/metro_driver/print_handler.cc - chromium/src - Git at Google

 // 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 "stdafx.h"
 #include "win8/metro_driver/print_handler.h"

 #include <windows.graphics.display.h>

 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/safe_numerics.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "win8/metro_driver/chrome_app_view.h"
 #include "win8/metro_driver/winrt_utils.h"

 namespace {

 typedef winfoundtn::ITypedEventHandler<
     wingfx::Printing::PrintManager*,
     wingfx::Printing::PrintTaskRequestedEventArgs*> PrintRequestedHandler;

 typedef winfoundtn::ITypedEventHandler<
     wingfx::Printing::PrintTask*,
     wingfx::Printing::PrintTaskCompletedEventArgs*> PrintTaskCompletedHandler;

 typedef winfoundtn::ITypedEventHandler<
     wingfx::Printing::PrintTask*, IInspectable*> PrintTaskInspectableHandler;

 typedef winfoundtn::ITypedEventHandler<
     wingfx::Printing::PrintTask*,
     wingfx::Printing::PrintTaskProgressingEventArgs*>
     PrintTaskProgressingHandler;

 }  // namespace

 namespace metro_driver {

 mswr::ComPtr<PrintDocumentSource> PrintHandler::current_document_source_;
 bool PrintHandler::printing_enabled_ = false;
 base::Lock* PrintHandler::lock_ = NULL;
 base::Thread* PrintHandler::thread_ = NULL;

 PrintHandler::PrintHandler() {
   DCHECK(lock_ == NULL);
   lock_ = new  base::Lock();

   DCHECK(thread_ == NULL);
   thread_ = new base::Thread("Metro Print Handler");
   thread_->Start();
 }

 PrintHandler::~PrintHandler() {
   ClearPrintTask();
   DCHECK(current_document_source_.Get() == NULL);

   // Get all pending tasks to complete cleanly by Stopping the thread.
   // They should complete quickly since current_document_source_ is NULL.
   DCHECK(thread_ != NULL);
   DCHECK(thread_->IsRunning());
   thread_->Stop();
   delete thread_;
   thread_ = NULL;

   DCHECK(lock_ != NULL);
   delete lock_;
   lock_ = NULL;
 }

 HRESULT PrintHandler::Initialize(winui::Core::ICoreWindow* window) {
   // Register for Print notifications.
   mswr::ComPtr<wingfx::Printing::IPrintManagerStatic> print_mgr_static;
   HRESULT hr = winrt_utils::CreateActivationFactory(
       RuntimeClass_Windows_Graphics_Printing_PrintManager,
       print_mgr_static.GetAddressOf());
   if (FAILED(hr)) {
     LOG(ERROR) << "Failed to create PrintManagerStatic " << std::hex << hr;
     return hr;
   }

   mswr::ComPtr<wingfx::Printing::IPrintManager> print_mgr;
   hr = print_mgr_static->GetForCurrentView(&print_mgr);
   if (FAILED(hr)) {
     LOG(ERROR) << "Failed to get PrintManager for current view " << std::hex
                << hr;
     return hr;
   }

   hr = print_mgr->add_PrintTaskRequested(
       mswr::Callback<PrintRequestedHandler>(
           this, &PrintHandler::OnPrintRequested).Get(),
       &print_requested_token_);
   LOG_IF(ERROR, FAILED(hr)) << "Failed to register PrintTaskRequested "
                             << std::hex << hr;

   mswr::ComPtr<wingfx::Display::IDisplayPropertiesStatics> display_properties;
   hr = winrt_utils::CreateActivationFactory(
       RuntimeClass_Windows_Graphics_Display_DisplayProperties,
       display_properties.GetAddressOf());
   if (FAILED(hr)) {
     LOG(ERROR) << "Failed to create DisplayPropertiesStatics " << std::hex
                << hr;
     return hr;
   }

   hr = display_properties->add_LogicalDpiChanged(
       mswr::Callback<
           wingfx::Display::IDisplayPropertiesEventHandler,
           PrintHandler>(this, &PrintHandler::LogicalDpiChanged).Get(),
       &dpi_change_token_);
   LOG_IF(ERROR, FAILED(hr)) << "Failed to register LogicalDpiChanged "
                             << std::hex << hr;

   // This flag adds support for surfaces with a different color channel
   // ordering than the API default. It is recommended usage, and is required
   // for compatibility with Direct2D.
   UINT creation_flags = D3D11_CREATE_DEVICE_BGRA_SUPPORT;
 #if defined(_DEBUG)
   creation_flags |= D3D11_CREATE_DEVICE_DEBUG;
 #endif

   // This array defines the set of DirectX hardware feature levels we support.
   // The ordering MUST be preserved. All applications are assumed to support
   // 9.1 unless otherwise stated by the application, which is not our case.
   D3D_FEATURE_LEVEL feature_levels[] = {
     D3D_FEATURE_LEVEL_11_1,
     D3D_FEATURE_LEVEL_11_0,
     D3D_FEATURE_LEVEL_10_1,
     D3D_FEATURE_LEVEL_10_0,
     D3D_FEATURE_LEVEL_9_3,
     D3D_FEATURE_LEVEL_9_2,
     D3D_FEATURE_LEVEL_9_1 };

   mswr::ComPtr<ID3D11Device> device;
   mswr::ComPtr<ID3D11DeviceContext> context;
   hr = D3D11CreateDevice(
       NULL,  // Specify null to use the default adapter.
       D3D_DRIVER_TYPE_HARDWARE,
       0,  // Leave as 0 unless software device.
       creation_flags,
       feature_levels,
       ARRAYSIZE(feature_levels),
       D3D11_SDK_VERSION,  // Must always use this value in Metro apps.
       &device,
       NULL,  // Returns feature level of device created.
       &context);
   if (hr == DXGI_ERROR_UNSUPPORTED) {
     // The hardware is not supported, try a reference driver instead.
     hr = D3D11CreateDevice(
         NULL,  // Specify null to use the default adapter.
         D3D_DRIVER_TYPE_REFERENCE,
         0,  // Leave as 0 unless software device.
         creation_flags,
         feature_levels,
         ARRAYSIZE(feature_levels),
         D3D11_SDK_VERSION,  // Must always use this value in Metro apps.
         &device,
         NULL,  // Returns feature level of device created.
         &context);
   }
   if (FAILED(hr)) {
     LOG(ERROR) << "Failed to create D3D11 device/context " << std::hex << hr;
     return hr;
   }

   hr = device.As(&directx_context_.d3d_device);
   if (FAILED(hr)) {
     LOG(ERROR) << "Failed to QI D3D11 device " << std::hex << hr;
     return hr;
   }

   D2D1_FACTORY_OPTIONS options;
   ZeroMemory(&options, sizeof(D2D1_FACTORY_OPTIONS));

 #if defined(_DEBUG)
   options.debugLevel = D2D1_DEBUG_LEVEL_INFORMATION;
 #endif

   hr = D2D1CreateFactory(D2D1_FACTORY_TYPE_MULTI_THREADED,
                          __uuidof(ID2D1Factory1),
                          &options,
                          &directx_context_.d2d_factory);
   if (FAILED(hr)) {
     LOG(ERROR) << "Failed to create D2D1 factory " << std::hex << hr;
     return hr;
   }

   mswr::ComPtr<IDXGIDevice> dxgi_device;
   hr = directx_context_.d3d_device.As(&dxgi_device);
   if (FAILED(hr)) {
     LOG(ERROR) << "Failed to QI for IDXGIDevice " << std::hex << hr;
     return hr;
   }

   hr = directx_context_.d2d_factory->CreateDevice(
       dxgi_device.Get(), &directx_context_.d2d_device);
   if (FAILED(hr)) {
     LOG(ERROR) << "Failed to Create D2DDevice " << std::hex << hr;
     return hr;
   }

   hr = directx_context_.d2d_device->CreateDeviceContext(
       D2D1_DEVICE_CONTEXT_OPTIONS_NONE,
       &directx_context_.d2d_context);
   if (FAILED(hr)) {
     LOG(ERROR) << "Failed to Create D2DDeviceContext " << std::hex << hr;
     return hr;
   }

   hr = CoCreateInstance(CLSID_WICImagingFactory,
                         NULL,
                         CLSCTX_INPROC_SERVER,
                         IID_PPV_ARGS(&directx_context_.wic_factory));
   if (FAILED(hr)) {
     LOG(ERROR) << "Failed to CoCreate WICImagingFactory " << std::hex << hr;
     return hr;
   }
   return hr;
 }

 void PrintHandler::EnablePrinting(bool printing_enabled) {
   thread_->message_loop()->PostTask(
       FROM_HERE,
       base::Bind(&PrintHandler::OnEnablePrinting, printing_enabled));
 }

 void PrintHandler::SetPageCount(size_t page_count) {
   thread_->message_loop()->PostTask(
       FROM_HERE,
       base::Bind(&PrintHandler::OnSetPageCount, page_count));
 }

 void PrintHandler::AddPage(size_t page_number, IStream* metafile_stream) {
   thread_->message_loop()->PostTask(
       FROM_HERE,
       base::Bind(&PrintHandler::OnAddPage,
                  page_number,
                  mswr::ComPtr<IStream>(metafile_stream)));
 }

 void PrintHandler::ShowPrintUI() {
   // Post the print UI request over to the metro thread.
   DCHECK(globals.appview_msg_loop != NULL);
   bool posted = globals.appview_msg_loop->PostTask(
       FROM_HERE, base::Bind(&metro_driver::PrintHandler::OnShowPrintUI));
   DCHECK(posted);
 }

 HRESULT PrintHandler::OnPrintRequested(
     wingfx::Printing::IPrintManager* print_mgr,
     wingfx::Printing::IPrintTaskRequestedEventArgs* event_args) {
   DVLOG(1) << __FUNCTION__;

   HRESULT hr = S_OK;
   if (printing_enabled_) {
     mswr::ComPtr<wingfx::Printing::IPrintTaskRequest> print_request;
     hr = event_args->get_Request(print_request.GetAddressOf());
     if (FAILED(hr)) {
       LOG(ERROR) << "Failed to get the Print Task request " << std::hex << hr;
       return hr;
     }

     mswrw::HString title;
     title.Attach(MakeHString(L"Printing"));
     hr = print_request->CreatePrintTask(
         title.Get(),
         mswr::Callback<
             wingfx::Printing::IPrintTaskSourceRequestedHandler,
             PrintHandler>(this, &PrintHandler::OnPrintTaskSourceRequest).Get(),
         print_task_.GetAddressOf());
     if (FAILED(hr)) {
       LOG(ERROR) << "Failed to create the Print Task " << std::hex << hr;
       return hr;
     }

     hr = print_task_->add_Completed(
         mswr::Callback<PrintTaskCompletedHandler>(
             this, &PrintHandler::OnCompleted).Get(), &print_completed_token_);
     LOG_IF(ERROR, FAILED(hr)) << "Failed to create the Print Task " << std::hex
                               << hr;
   }
   return hr;
 }

 HRESULT PrintHandler::OnPrintTaskSourceRequest(
     wingfx::Printing::IPrintTaskSourceRequestedArgs* args) {
   DVLOG(1) << __FUNCTION__;
   mswr::ComPtr<PrintDocumentSource> print_document_source;
   HRESULT hr = mswr::MakeAndInitialize<PrintDocumentSource>(
       &print_document_source, directx_context_, lock_);
   if (FAILED(hr)) {
     LOG(ERROR) << "Failed to create document source " << std::hex << hr;
     return hr;
   }

   print_document_source->ResetDpi(GetLogicalDpi());

   mswr::ComPtr<wingfx::Printing::IPrintDocumentSource> print_source;
   hr = print_document_source.As(&print_source);
   if (FAILED(hr)) {
     LOG(ERROR) << "Failed to cast document Source " << std::hex << hr;
     return hr;
   }

   hr = args->SetSource(print_source.Get());
   if (FAILED(hr)) {
     LOG(ERROR) << "Failed to set document Source " << std::hex << hr;
     return hr;
   }

   thread_->message_loop()->PostTask(
       FROM_HERE,
       base::Bind(&PrintHandler::SetPrintDocumentSource,
                  print_document_source));

   return hr;
 }

 HRESULT PrintHandler::OnCompleted(
     wingfx::Printing::IPrintTask* task,
     wingfx::Printing::IPrintTaskCompletedEventArgs* args) {
   DVLOG(1) << __FUNCTION__;
   DCHECK(globals.appview_msg_loop->BelongsToCurrentThread());
   ClearPrintTask();
   thread_->message_loop()->PostTask(
       FROM_HERE,
       base::Bind(&PrintHandler::ReleasePrintDocumentSource));

   return S_OK;
 }

 void PrintHandler::ClearPrintTask() {
   if (!print_task_.Get())
     return;

   HRESULT hr = print_task_->remove_Completed(print_completed_token_);
   LOG_IF(ERROR, FAILED(hr)) << "Failed to remove completed event from Task "
                             << std::hex << hr;
   print_task_.Reset();
 }

 float PrintHandler::GetLogicalDpi() {
   mswr::ComPtr<wingfx::Display::IDisplayPropertiesStatics> display_properties;
   HRESULT hr = winrt_utils::CreateActivationFactory(
       RuntimeClass_Windows_Graphics_Display_DisplayProperties,
       display_properties.GetAddressOf());
   if (FAILED(hr)) {
     LOG(ERROR) << "Failed to get display properties " << std::hex << hr;
     return 0.0;
   }

   FLOAT dpi = 0.0;
   hr = display_properties->get_LogicalDpi(&dpi);
   LOG_IF(ERROR, FAILED(hr)) << "Failed to get Logical DPI " << std::hex << hr;

   return dpi;
 }

 HRESULT PrintHandler::LogicalDpiChanged(IInspectable *sender) {
   DVLOG(1) << __FUNCTION__;
   thread_->message_loop()->PostTask(
       FROM_HERE,
       base::Bind(&PrintHandler::OnLogicalDpiChanged, GetLogicalDpi()));
   return S_OK;
 }

 void PrintHandler::OnLogicalDpiChanged(float dpi) {
   DCHECK(base::MessageLoop::current() == thread_->message_loop());
   // No need to protect the access to the static variable,
   // since it's set/released in this same thread.
   if (current_document_source_.Get() != NULL)
     current_document_source_->ResetDpi(dpi);
 }

 void PrintHandler::SetPrintDocumentSource(
     const mswr::ComPtr<PrintDocumentSource>& print_document_source) {
   DCHECK(base::MessageLoop::current() == thread_->message_loop());
   DCHECK(current_document_source_.Get() == NULL);
   {
     // Protect against the other thread which might try to access it.
     base::AutoLock lock(*lock_);
     current_document_source_ = print_document_source;
   }
   // Start generating the images to print.
   // TODO(mad): Use a registered message with more information about the print
   // request, and at a more appropriate time too, and maybe one page at a time.
   ::PostMessageW(globals.host_windows.front().first,
                  WM_SYSCOMMAND,
                  IDC_PRINT_TO_DESTINATION,
                  0);
 }

 void PrintHandler::ReleasePrintDocumentSource() {
   DCHECK(base::MessageLoop::current() == thread_->message_loop());
   mswr::ComPtr<PrintDocumentSource> print_document_source;
   {
     // Must wait for other thread to be done with the pointer first.
     base::AutoLock lock(*lock_);
     current_document_source_.Swap(print_document_source);
   }
   // This may happen before we get a chance to set the value.
   if (print_document_source.Get() != NULL)
     print_document_source->Abort();
 }

 void PrintHandler::OnEnablePrinting(bool printing_enabled) {
   DCHECK(base::MessageLoop::current() == thread_->message_loop());
   base::AutoLock lock(*lock_);
   printing_enabled_ = printing_enabled;
   // Don't abort if we are being disabled since we may be finishing a previous
   // print request which was valid and should be finished. We just need to
   // prevent any new print requests. And don't assert that we are NOT printing
   // if we are becoming enabled since we may be finishing a long print while
   // we got disabled and then enabled again...
 }

 void PrintHandler::OnSetPageCount(size_t page_count) {
   DCHECK(base::MessageLoop::current() == thread_->message_loop());
   // No need to protect the access to the static variable,
   // since it's set/released in this same thread.
   if (current_document_source_.Get() != NULL)
     current_document_source_->SetPageCount(page_count);
 }

 void PrintHandler::OnAddPage(size_t page_number,
                              mswr::ComPtr<IStream> metafile_stream) {
   DCHECK(base::MessageLoop::current() == thread_->message_loop());
   // No need to protect the access to the static variable,
   // since it's set/released in this same thread.
   if (current_document_source_.Get() != NULL)
     current_document_source_->AddPage(page_number, metafile_stream.Get());
 }

 void PrintHandler::OnShowPrintUI() {
   DCHECK(globals.appview_msg_loop->BelongsToCurrentThread());
   mswr::ComPtr<wingfx::Printing::IPrintManagerStatic> print_mgr_static;
   HRESULT hr = winrt_utils::CreateActivationFactory(
       RuntimeClass_Windows_Graphics_Printing_PrintManager,
       print_mgr_static.GetAddressOf());
   if (SUCCEEDED(hr)) {
     DCHECK(print_mgr_static.Get() != NULL);
     // Note that passing NULL to ShowPrintUIAsync crashes,
     // so we need to setup a temp pointer.
     mswr::ComPtr<winfoundtn::IAsyncOperation<bool>> unused_async_op;
     hr = print_mgr_static->ShowPrintUIAsync(unused_async_op.GetAddressOf());
     LOG_IF(ERROR, FAILED(hr)) << "Failed to ShowPrintUIAsync "
                               << std::hex << std::showbase << hr;
   } else {
     LOG(ERROR) << "Failed to create PrintManagerStatic "
                << std::hex << std::showbase << hr;
   }
 }

 }  // namespace metro_driver

 void MetroEnablePrinting(BOOL printing_enabled) {
   metro_driver::PrintHandler::EnablePrinting(!!printing_enabled);
 }

 void MetroSetPrintPageCount(size_t page_count) {
   DVLOG(1) << __FUNCTION__ << " Page count: " << page_count;
   metro_driver::PrintHandler::SetPageCount(page_count);
 }

 void MetroSetPrintPageContent(size_t page_number,
                               void* data,
                               size_t data_size) {
   DVLOG(1) << __FUNCTION__ << " Page number: " << page_number;
   DCHECK(data != NULL);
   DCHECK(data_size > 0);
   mswr::ComPtr<IStream> metafile_stream;
   HRESULT hr = ::CreateStreamOnHGlobal(
       NULL, TRUE, metafile_stream.GetAddressOf());
   if (metafile_stream.Get() != NULL) {
     ULONG bytes_written = 0;
     hr = metafile_stream->Write(data,
                                 base::checked_numeric_cast<ULONG>(data_size),
                                 &bytes_written);
     LOG_IF(ERROR, FAILED(hr)) << "Failed to Write to Stream " << std::hex << hr;
     DCHECK(bytes_written == data_size);

     metro_driver::PrintHandler::AddPage(page_number, metafile_stream.Get());
   } else {
     NOTREACHED() << "Failed to CreateStreamOnHGlobal " << std::hex << hr;
   }
 }

 void MetroShowPrintUI() {
   metro_driver::PrintHandler::ShowPrintUI();
 }
	// 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 "stdafx.h"
	#include "win8/metro_driver/print_handler.h"

	#include <windows.graphics.display.h>

	#include "base/bind.h"
	#include "base/logging.h"
	#include "base/safe_numerics.h"
	#include "chrome/app/chrome_command_ids.h"
	#include "win8/metro_driver/chrome_app_view.h"
	#include "win8/metro_driver/winrt_utils.h"

	namespace {

	typedef winfoundtn::ITypedEventHandler<
	wingfx::Printing::PrintManager*,
	wingfx::Printing::PrintTaskRequestedEventArgs*> PrintRequestedHandler;

	typedef winfoundtn::ITypedEventHandler<
	wingfx::Printing::PrintTask*,
	wingfx::Printing::PrintTaskCompletedEventArgs*> PrintTaskCompletedHandler;

	typedef winfoundtn::ITypedEventHandler<
	wingfx::Printing::PrintTask, IInspectable> PrintTaskInspectableHandler;

	typedef winfoundtn::ITypedEventHandler<
	wingfx::Printing::PrintTask*,
	wingfx::Printing::PrintTaskProgressingEventArgs*>
	PrintTaskProgressingHandler;

	} // namespace

	namespace metro_driver {

	mswr::ComPtr<PrintDocumentSource> PrintHandler::current_document_source_;
	bool PrintHandler::printing_enabled_ = false;
	base::Lock* PrintHandler::lock_ = NULL;
	base::Thread* PrintHandler::thread_ = NULL;

	PrintHandler::PrintHandler() {
	DCHECK(lock_ == NULL);
	lock_ = new base::Lock();

	DCHECK(thread_ == NULL);
	thread_ = new base::Thread("Metro Print Handler");
	thread_->Start();
	}

	PrintHandler::~PrintHandler() {
	ClearPrintTask();
	DCHECK(current_document_source_.Get() == NULL);

	// Get all pending tasks to complete cleanly by Stopping the thread.
	// They should complete quickly since current_document_source_ is NULL.
	DCHECK(thread_ != NULL);
	DCHECK(thread_->IsRunning());
	thread_->Stop();
	delete thread_;
	thread_ = NULL;

	DCHECK(lock_ != NULL);
	delete lock_;
	lock_ = NULL;
	}

	HRESULT PrintHandler::Initialize(winui::Core::ICoreWindow* window) {
	// Register for Print notifications.
	mswr::ComPtr<wingfx::Printing::IPrintManagerStatic> print_mgr_static;
	HRESULT hr = winrt_utils::CreateActivationFactory(
	RuntimeClass_Windows_Graphics_Printing_PrintManager,
	print_mgr_static.GetAddressOf());
	if (FAILED(hr)) {
	LOG(ERROR) << "Failed to create PrintManagerStatic " << std::hex << hr;
	return hr;
	}

	mswr::ComPtr<wingfx::Printing::IPrintManager> print_mgr;
	hr = print_mgr_static->GetForCurrentView(&print_mgr);
	if (FAILED(hr)) {
	LOG(ERROR) << "Failed to get PrintManager for current view " << std::hex
	<< hr;
	return hr;
	}

	hr = print_mgr->add_PrintTaskRequested(
	mswr::Callback<PrintRequestedHandler>(
	this, &PrintHandler::OnPrintRequested).Get(),
	&print_requested_token_);
	LOG_IF(ERROR, FAILED(hr)) << "Failed to register PrintTaskRequested "
	<< std::hex << hr;

	mswr::ComPtr<wingfx::Display::IDisplayPropertiesStatics> display_properties;
	hr = winrt_utils::CreateActivationFactory(
	RuntimeClass_Windows_Graphics_Display_DisplayProperties,
	display_properties.GetAddressOf());
	if (FAILED(hr)) {
	LOG(ERROR) << "Failed to create DisplayPropertiesStatics " << std::hex
	<< hr;
	return hr;
	}

	hr = display_properties->add_LogicalDpiChanged(
	mswr::Callback<
	wingfx::Display::IDisplayPropertiesEventHandler,
	PrintHandler>(this, &PrintHandler::LogicalDpiChanged).Get(),
	&dpi_change_token_);
	LOG_IF(ERROR, FAILED(hr)) << "Failed to register LogicalDpiChanged "
	<< std::hex << hr;

	// This flag adds support for surfaces with a different color channel
	// ordering than the API default. It is recommended usage, and is required
	// for compatibility with Direct2D.
	UINT creation_flags = D3D11_CREATE_DEVICE_BGRA_SUPPORT;
	#if defined(_DEBUG)
	creation_flags \|= D3D11_CREATE_DEVICE_DEBUG;
	#endif

	// This array defines the set of DirectX hardware feature levels we support.
	// The ordering MUST be preserved. All applications are assumed to support
	// 9.1 unless otherwise stated by the application, which is not our case.
	D3D_FEATURE_LEVEL feature_levels[] = {
	D3D_FEATURE_LEVEL_11_1,
	D3D_FEATURE_LEVEL_11_0,
	D3D_FEATURE_LEVEL_10_1,
	D3D_FEATURE_LEVEL_10_0,
	D3D_FEATURE_LEVEL_9_3,
	D3D_FEATURE_LEVEL_9_2,
	D3D_FEATURE_LEVEL_9_1 };

	mswr::ComPtr<ID3D11Device> device;
	mswr::ComPtr<ID3D11DeviceContext> context;
	hr = D3D11CreateDevice(
	NULL, // Specify null to use the default adapter.
	D3D_DRIVER_TYPE_HARDWARE,
	0, // Leave as 0 unless software device.
	creation_flags,
	feature_levels,
	ARRAYSIZE(feature_levels),
	D3D11_SDK_VERSION, // Must always use this value in Metro apps.
	&device,
	NULL, // Returns feature level of device created.
	&context);
	if (hr == DXGI_ERROR_UNSUPPORTED) {
	// The hardware is not supported, try a reference driver instead.
	hr = D3D11CreateDevice(
	NULL, // Specify null to use the default adapter.
	D3D_DRIVER_TYPE_REFERENCE,
	0, // Leave as 0 unless software device.
	creation_flags,
	feature_levels,
	ARRAYSIZE(feature_levels),
	D3D11_SDK_VERSION, // Must always use this value in Metro apps.
	&device,
	NULL, // Returns feature level of device created.
	&context);
	}
	if (FAILED(hr)) {
	LOG(ERROR) << "Failed to create D3D11 device/context " << std::hex << hr;
	return hr;
	}

	hr = device.As(&directx_context_.d3d_device);
	if (FAILED(hr)) {
	LOG(ERROR) << "Failed to QI D3D11 device " << std::hex << hr;
	return hr;
	}

	D2D1_FACTORY_OPTIONS options;
	ZeroMemory(&options, sizeof(D2D1_FACTORY_OPTIONS));

	#if defined(_DEBUG)
	options.debugLevel = D2D1_DEBUG_LEVEL_INFORMATION;
	#endif

	hr = D2D1CreateFactory(D2D1_FACTORY_TYPE_MULTI_THREADED,
	__uuidof(ID2D1Factory1),
	&options,
	&directx_context_.d2d_factory);
	if (FAILED(hr)) {
	LOG(ERROR) << "Failed to create D2D1 factory " << std::hex << hr;
	return hr;
	}

	mswr::ComPtr<IDXGIDevice> dxgi_device;
	hr = directx_context_.d3d_device.As(&dxgi_device);
	if (FAILED(hr)) {
	LOG(ERROR) << "Failed to QI for IDXGIDevice " << std::hex << hr;
	return hr;
	}

	hr = directx_context_.d2d_factory->CreateDevice(
	dxgi_device.Get(), &directx_context_.d2d_device);
	if (FAILED(hr)) {
	LOG(ERROR) << "Failed to Create D2DDevice " << std::hex << hr;
	return hr;
	}

	hr = directx_context_.d2d_device->CreateDeviceContext(
	D2D1_DEVICE_CONTEXT_OPTIONS_NONE,
	&directx_context_.d2d_context);
	if (FAILED(hr)) {
	LOG(ERROR) << "Failed to Create D2DDeviceContext " << std::hex << hr;
	return hr;
	}

	hr = CoCreateInstance(CLSID_WICImagingFactory,
	NULL,
	CLSCTX_INPROC_SERVER,
	IID_PPV_ARGS(&directx_context_.wic_factory));
	if (FAILED(hr)) {
	LOG(ERROR) << "Failed to CoCreate WICImagingFactory " << std::hex << hr;
	return hr;
	}
	return hr;
	}

	void PrintHandler::EnablePrinting(bool printing_enabled) {
	thread_->message_loop()->PostTask(
	FROM_HERE,
	base::Bind(&PrintHandler::OnEnablePrinting, printing_enabled));
	}

	void PrintHandler::SetPageCount(size_t page_count) {
	thread_->message_loop()->PostTask(
	FROM_HERE,
	base::Bind(&PrintHandler::OnSetPageCount, page_count));
	}

	void PrintHandler::AddPage(size_t page_number, IStream* metafile_stream) {
	thread_->message_loop()->PostTask(
	FROM_HERE,
	base::Bind(&PrintHandler::OnAddPage,
	page_number,
	mswr::ComPtr<IStream>(metafile_stream)));
	}

	void PrintHandler::ShowPrintUI() {
	// Post the print UI request over to the metro thread.
	DCHECK(globals.appview_msg_loop != NULL);
	bool posted = globals.appview_msg_loop->PostTask(
	FROM_HERE, base::Bind(&metro_driver::PrintHandler::OnShowPrintUI));
	DCHECK(posted);
	}

	HRESULT PrintHandler::OnPrintRequested(
	wingfx::Printing::IPrintManager* print_mgr,
	wingfx::Printing::IPrintTaskRequestedEventArgs* event_args) {
	DVLOG(1) << __FUNCTION__;

	HRESULT hr = S_OK;
	if (printing_enabled_) {
	mswr::ComPtr<wingfx::Printing::IPrintTaskRequest> print_request;
	hr = event_args->get_Request(print_request.GetAddressOf());
	if (FAILED(hr)) {
	LOG(ERROR) << "Failed to get the Print Task request " << std::hex << hr;
	return hr;
	}

	mswrw::HString title;
	title.Attach(MakeHString(L"Printing"));
	hr = print_request->CreatePrintTask(
	title.Get(),
	mswr::Callback<
	wingfx::Printing::IPrintTaskSourceRequestedHandler,
	PrintHandler>(this, &PrintHandler::OnPrintTaskSourceRequest).Get(),
	print_task_.GetAddressOf());
	if (FAILED(hr)) {
	LOG(ERROR) << "Failed to create the Print Task " << std::hex << hr;
	return hr;
	}

	hr = print_task_->add_Completed(
	mswr::Callback<PrintTaskCompletedHandler>(
	this, &PrintHandler::OnCompleted).Get(), &print_completed_token_);
	LOG_IF(ERROR, FAILED(hr)) << "Failed to create the Print Task " << std::hex
	<< hr;
	}
	return hr;
	}

	HRESULT PrintHandler::OnPrintTaskSourceRequest(
	wingfx::Printing::IPrintTaskSourceRequestedArgs* args) {
	DVLOG(1) << __FUNCTION__;
	mswr::ComPtr<PrintDocumentSource> print_document_source;
	HRESULT hr = mswr::MakeAndInitialize<PrintDocumentSource>(
	&print_document_source, directx_context_, lock_);
	if (FAILED(hr)) {
	LOG(ERROR) << "Failed to create document source " << std::hex << hr;
	return hr;
	}

	print_document_source->ResetDpi(GetLogicalDpi());

	mswr::ComPtr<wingfx::Printing::IPrintDocumentSource> print_source;
	hr = print_document_source.As(&print_source);
	if (FAILED(hr)) {
	LOG(ERROR) << "Failed to cast document Source " << std::hex << hr;
	return hr;
	}

	hr = args->SetSource(print_source.Get());
	if (FAILED(hr)) {
	LOG(ERROR) << "Failed to set document Source " << std::hex << hr;
	return hr;
	}

	thread_->message_loop()->PostTask(
	FROM_HERE,
	base::Bind(&PrintHandler::SetPrintDocumentSource,
	print_document_source));

	return hr;
	}

	HRESULT PrintHandler::OnCompleted(
	wingfx::Printing::IPrintTask* task,
	wingfx::Printing::IPrintTaskCompletedEventArgs* args) {
	DVLOG(1) << __FUNCTION__;
	DCHECK(globals.appview_msg_loop->BelongsToCurrentThread());
	ClearPrintTask();
	thread_->message_loop()->PostTask(
	FROM_HERE,
	base::Bind(&PrintHandler::ReleasePrintDocumentSource));

	return S_OK;
	}

	void PrintHandler::ClearPrintTask() {
	if (!print_task_.Get())
	return;

	HRESULT hr = print_task_->remove_Completed(print_completed_token_);
	LOG_IF(ERROR, FAILED(hr)) << "Failed to remove completed event from Task "
	<< std::hex << hr;
	print_task_.Reset();
	}

	float PrintHandler::GetLogicalDpi() {
	mswr::ComPtr<wingfx::Display::IDisplayPropertiesStatics> display_properties;
	HRESULT hr = winrt_utils::CreateActivationFactory(
	RuntimeClass_Windows_Graphics_Display_DisplayProperties,
	display_properties.GetAddressOf());
	if (FAILED(hr)) {
	LOG(ERROR) << "Failed to get display properties " << std::hex << hr;
	return 0.0;
	}

	FLOAT dpi = 0.0;
	hr = display_properties->get_LogicalDpi(&dpi);
	LOG_IF(ERROR, FAILED(hr)) << "Failed to get Logical DPI " << std::hex << hr;

	return dpi;
	}

	HRESULT PrintHandler::LogicalDpiChanged(IInspectable *sender) {
	DVLOG(1) << __FUNCTION__;
	thread_->message_loop()->PostTask(
	FROM_HERE,
	base::Bind(&PrintHandler::OnLogicalDpiChanged, GetLogicalDpi()));
	return S_OK;
	}

	void PrintHandler::OnLogicalDpiChanged(float dpi) {
	DCHECK(base::MessageLoop::current() == thread_->message_loop());
	// No need to protect the access to the static variable,
	// since it's set/released in this same thread.
	if (current_document_source_.Get() != NULL)
	current_document_source_->ResetDpi(dpi);
	}

	void PrintHandler::SetPrintDocumentSource(
	const mswr::ComPtr<PrintDocumentSource>& print_document_source) {
	DCHECK(base::MessageLoop::current() == thread_->message_loop());
	DCHECK(current_document_source_.Get() == NULL);
	{
	// Protect against the other thread which might try to access it.
	base::AutoLock lock(*lock_);
	current_document_source_ = print_document_source;
	}
	// Start generating the images to print.
	// TODO(mad): Use a registered message with more information about the print
	// request, and at a more appropriate time too, and maybe one page at a time.
	::PostMessageW(globals.host_windows.front().first,
	WM_SYSCOMMAND,
	IDC_PRINT_TO_DESTINATION,
	0);
	}

	void PrintHandler::ReleasePrintDocumentSource() {
	DCHECK(base::MessageLoop::current() == thread_->message_loop());
	mswr::ComPtr<PrintDocumentSource> print_document_source;
	{
	// Must wait for other thread to be done with the pointer first.
	base::AutoLock lock(*lock_);
	current_document_source_.Swap(print_document_source);
	}
	// This may happen before we get a chance to set the value.
	if (print_document_source.Get() != NULL)
	print_document_source->Abort();
	}

	void PrintHandler::OnEnablePrinting(bool printing_enabled) {
	DCHECK(base::MessageLoop::current() == thread_->message_loop());
	base::AutoLock lock(*lock_);
	printing_enabled_ = printing_enabled;
	// Don't abort if we are being disabled since we may be finishing a previous
	// print request which was valid and should be finished. We just need to
	// prevent any new print requests. And don't assert that we are NOT printing
	// if we are becoming enabled since we may be finishing a long print while
	// we got disabled and then enabled again...
	}

	void PrintHandler::OnSetPageCount(size_t page_count) {
	DCHECK(base::MessageLoop::current() == thread_->message_loop());
	// No need to protect the access to the static variable,
	// since it's set/released in this same thread.
	if (current_document_source_.Get() != NULL)
	current_document_source_->SetPageCount(page_count);
	}

	void PrintHandler::OnAddPage(size_t page_number,
	mswr::ComPtr<IStream> metafile_stream) {
	DCHECK(base::MessageLoop::current() == thread_->message_loop());
	// No need to protect the access to the static variable,
	// since it's set/released in this same thread.
	if (current_document_source_.Get() != NULL)
	current_document_source_->AddPage(page_number, metafile_stream.Get());
	}

	void PrintHandler::OnShowPrintUI() {
	DCHECK(globals.appview_msg_loop->BelongsToCurrentThread());
	mswr::ComPtr<wingfx::Printing::IPrintManagerStatic> print_mgr_static;
	HRESULT hr = winrt_utils::CreateActivationFactory(
	RuntimeClass_Windows_Graphics_Printing_PrintManager,
	print_mgr_static.GetAddressOf());
	if (SUCCEEDED(hr)) {
	DCHECK(print_mgr_static.Get() != NULL);
	// Note that passing NULL to ShowPrintUIAsync crashes,
	// so we need to setup a temp pointer.
	mswr::ComPtr<winfoundtn::IAsyncOperation<bool>> unused_async_op;
	hr = print_mgr_static->ShowPrintUIAsync(unused_async_op.GetAddressOf());
	LOG_IF(ERROR, FAILED(hr)) << "Failed to ShowPrintUIAsync "
	<< std::hex << std::showbase << hr;
	} else {
	LOG(ERROR) << "Failed to create PrintManagerStatic "
	<< std::hex << std::showbase << hr;
	}
	}

	} // namespace metro_driver

	void MetroEnablePrinting(BOOL printing_enabled) {
	metro_driver::PrintHandler::EnablePrinting(!!printing_enabled);
	}

	void MetroSetPrintPageCount(size_t page_count) {
	DVLOG(1) << __FUNCTION__ << " Page count: " << page_count;
	metro_driver::PrintHandler::SetPageCount(page_count);
	}

	void MetroSetPrintPageContent(size_t page_number,
	void* data,
	size_t data_size) {
	DVLOG(1) << __FUNCTION__ << " Page number: " << page_number;
	DCHECK(data != NULL);
	DCHECK(data_size > 0);
	mswr::ComPtr<IStream> metafile_stream;
	HRESULT hr = ::CreateStreamOnHGlobal(
	NULL, TRUE, metafile_stream.GetAddressOf());
	if (metafile_stream.Get() != NULL) {
	ULONG bytes_written = 0;
	hr = metafile_stream->Write(data,
	base::checked_numeric_cast<ULONG>(data_size),
	&bytes_written);
	LOG_IF(ERROR, FAILED(hr)) << "Failed to Write to Stream " << std::hex << hr;
	DCHECK(bytes_written == data_size);

	metro_driver::PrintHandler::AddPage(page_number, metafile_stream.Get());
	} else {
	NOTREACHED() << "Failed to CreateStreamOnHGlobal " << std::hex << hr;
	}
	}

	void MetroShowPrintUI() {
	metro_driver::PrintHandler::ShowPrintUI();
	}