Integrate the Windows 8 code into the Chromium tree.

win8/metro_driver/print_handler.h

Index: win8/metro_driver/print_handler.h
diff --git a/win8/metro_driver/print_handler.h b/win8/metro_driver/print_handler.h
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+// 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.
+
+#ifndef CHROME_BROWSER_UI_METRO_DRIVER_PRINT_HANDLER_H_
+#define CHROME_BROWSER_UI_METRO_DRIVER_PRINT_HANDLER_H_
+
+#include <windows.media.playto.h>
+#include <windows.graphics.printing.h>
+#include <windows.ui.core.h>
+
+#include "base/synchronization/lock.h"
+#include "base/threading/thread.h"
+#include "win8/metro_driver/print_document_source.h"
+#include "win8/metro_driver/winrt_utils.h"
+
+namespace base {
+
+class Lock;
+
+}  // namespace base
+
+namespace metro_driver {
+
+// This class handles the print aspect of the devices charm.
+class PrintHandler {
+ public:
+  PrintHandler();
+  ~PrintHandler();
+
+  HRESULT Initialize(winui::Core::ICoreWindow* window);
+
+  // Called by the exported C functions.
+  static void EnablePrinting(bool printing_enabled);
+  static void SetPageCount(size_t page_count);
+  static void AddPage(size_t page_number, IStream* metafile_stream);
+  static void ShowPrintUI();
+
+ private:
+  // Callbacks from Metro.
+  HRESULT OnPrintRequested(
+      wingfx::Printing::IPrintManager* print_mgr,
+      wingfx::Printing::IPrintTaskRequestedEventArgs* event_args);
+
+  HRESULT OnPrintTaskSourceRequest(
+      wingfx::Printing::IPrintTaskSourceRequestedArgs* args);
+
+  HRESULT OnCompleted(wingfx::Printing::IPrintTask* task,
+                      wingfx::Printing::IPrintTaskCompletedEventArgs* args);
+  // Utility methods.
+  void ClearPrintTask();
+  float GetLogicalDpi();
+
+  // Callback from Metro and entry point called on lockable thread.
+  HRESULT LogicalDpiChanged(IInspectable *sender);
+  static void OnLogicalDpiChanged(float dpi);
+
+  // Called on the lockable thread to set/release the doc.
+  static void SetPrintDocumentSource(
+      const mswr::ComPtr<PrintDocumentSource>& print_document_source);
+  static void ReleasePrintDocumentSource();
+
+  // Called on the lockable thread for the exported C functions.
+  static void OnEnablePrinting(bool printing_enabled);
+  static void OnSetPageCount(size_t page_count);
+  static void OnAddPage(size_t page_number,
+                        mswr::ComPtr<IStream> metafile_stream);
+
+  // Opens the prit device charm. Must be called from the metro thread.
+  static void OnShowPrintUI();
+
+  mswr::ComPtr<wingfx::Printing::IPrintTask> print_task_;
+  EventRegistrationToken print_requested_token_;
+  EventRegistrationToken print_completed_token_;
+  EventRegistrationToken dpi_change_token_;
+
+  mswr::ComPtr<wingfx::Printing::IPrintManager> print_manager_;
+  PrintDocumentSource::DirectXContext directx_context_;
+
+  // Hack to give access to the Print Document from the C style entry points.
+  // This will go away once we can pass a pointer to this interface down to
+  // the Chrome Browser as we send the command to print.
+  static mswr::ComPtr<PrintDocumentSource> current_document_source_;
+
+  // Another hack to enable/disable printing from an exported C function.
+  // TODO(mad): Find a better way to do this...
+  static bool printing_enabled_;
+
+  // This is also a temporary hack until we can pass down the print document
+  // to Chrome so it can call directly into it. We need to lock the access to
+  // current_document_source_.
+  static base::Lock* lock_;
+
+  // This thread is used to send blocking jobs
+  // out of threads we don't want to block.
+  static base::Thread* thread_;
+};
+
+}  // namespace metro_driver
+
+// Exported C functions for Chrome to call into the Metro module.
+extern "C" __declspec(dllexport)
+void MetroEnablePrinting(BOOL printing_enabled);
+
+extern "C" __declspec(dllexport)
+void MetroSetPrintPageCount(size_t page_count);
+
+extern "C" __declspec(dllexport)
+void MetroSetPrintPageContent(size_t current_page,
+                              void* data,
+                              size_t data_size);
+
+extern "C" __declspec(dllexport)
+void MetroShowPrintUI();
+
+#endif  // CHROME_BROWSER_UI_METRO_DRIVER_PRINT_HANDLER_H_