Use file handles to interact with utility process.

chrome/browser/printing/print_job.h

 // 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_PRINTING_PRINT_JOB_H_
 #define CHROME_BROWSER_PRINTING_PRINT_JOB_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "chrome/browser/printing/print_job_worker_owner.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
 class Thread;
 
+namespace base {
+class RefCountedMemory;
+}
+
 namespace printing {
 
-// See definition below.
 class JobEventDetails;
-
+class MetafilePlayer;
+class PdfToEmfConverter;
+class PrintJobWorker;
 class PrintedDocument;
 class PrintedPage;
 class PrintedPagesSource;
-class PrintJobWorker;
 class PrinterQuery;
 
 // Manages the print work for a specific document. Talks to the printer through
 // PrintingContext through PrintJobWorker. Hides access to PrintingContext in a
 // worker thread so the caller never blocks. PrintJob will send notifications on
 // any state change. While printing, the PrintJobManager instance keeps a
 // reference to the job to be sure it is kept alive. All the code in this class
 // runs in the UI thread.
 class PrintJob : public PrintJobWorkerOwner,
                  public content::NotificationObserver {
@@ skipping 42 matching lines @@
   // the source is being destroyed.
   void DisconnectSource();
 
   // Returns true if the print job is pending, i.e. between a StartPrinting()
   // and the end of the spooling.
   bool is_job_pending() const;
 
   // Access the current printed document. Warning: may be NULL.
   PrintedDocument* document() const;
 
+#if defined(OS_WIN)
+  void ConvertPdfToEmf(const scoped_refptr<base::RefCountedMemory>& bytes,
+                       gfx::Size page_size,

[Lei Zhang, 2014/09/15 21:49:53]

nit: pass by reference?

[Vitaly Buka (NO REVIEWS), 2014/09/15 22:33:50]

Done.

+                       gfx::Rect content_area);
+#endif  // OS_WIN
+
  protected:
   virtual ~PrintJob();
 
  private:
   // Updates document_ to a new instance.
   void UpdatePrintedDocument(PrintedDocument* new_document);
 
   // Processes a NOTIFY_PRINT_JOB_EVENT notification.
   void OnNotifyPrintJobEvent(const JobEventDetails& event_details);
 
   // Releases the worker thread by calling Stop(), then broadcasts a JOB_DONE
   // notification.
   void OnDocumentDone();
 
   // Terminates the worker thread in a very controlled way, to work around any
   // eventual deadlock.
   void ControlledWorkerShutdown();
 
   // Called at shutdown when running a nested message loop.
   void Quit();
 
   void HoldUntilStopIsCalled();
 
+#if defined(OS_WIN)
+  // Called on completion of converting the pdf to emf.
+  void OnPdfPageConvertedToEmf(int page_number,
+                               double scale_factor,
+                               scoped_ptr<MetafilePlayer> emf);
+  void OnPdfLoaded(int page_number);
+#endif  // OS_WIN
+
   content::NotificationRegistrar registrar_;
 
   // Source that generates the PrintedPage's (i.e. a WebContents). It will be
   // set back to NULL if the source is deleted before this object.
   PrintedPagesSource* source_;
 
   // All the UI is done in a worker thread because many Win32 print functions
   // are blocking and enters a message loop without your consent. There is one
   // worker thread per print job.
   scoped_ptr<PrintJobWorker> worker_;
 
   // Cache of the print context settings for access in the UI thread.
   PrintSettings settings_;
 
   // The printed document.
   scoped_refptr<PrintedDocument> document_;
 
   // Is the worker thread printing.
   bool is_job_pending_;
 
   // Is Canceling? If so, try to not cause recursion if on FAILED notification,
   // the notified calls Cancel() again.
   bool is_canceling_;
 
+#if defined(OS_WIN)
+  scoped_ptr<PdfToEmfConverter> pdf_to_emf_converter_;
+  int pdf_to_emf_page_count_;
+  int pdf_to_emf_current_page_;
+  gfx::Size pdf_to_emf_page_size_;
+  gfx::Rect pdf_to_emf_content_area_;
+#endif  // OS_WIN
+
   // Used at shutdown so that we can quit a nested message loop.
   base::WeakPtrFactory<PrintJob> quit_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintJob);
 };
 
 // Details for a NOTIFY_PRINT_JOB_EVENT notification. The members may be NULL.
 class JobEventDetails : public base::RefCountedThreadSafe<JobEventDetails> {
  public:
   // Event type.
@@ skipping 48 matching lines @@
   scoped_refptr<PrintedDocument> document_;
   scoped_refptr<PrintedPage> page_;
   const Type type_;
 
   DISALLOW_COPY_AND_ASSIGN(JobEventDetails);
 };
 
 }  // namespace printing
 
 #endif  // CHROME_BROWSER_PRINTING_PRINT_JOB_H_