Linux: print page to file rather than using shared memory to send it to the b...

printing/pdf_ps_metafile_linux.h

 // Copyright (c) 2009 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 PRINTING_PDF_PS_METAFILE_LINUX_H_
 #define PRINTING_PDF_PS_METAFILE_LINUX_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 
 typedef struct _cairo_surface cairo_surface_t;
 typedef struct _cairo cairo_t;
 
+namespace base {
+class FileDescriptor;
+}
+
 class FilePath;
 
 namespace printing {
 
 // This class uses Cairo graphics library to generate PostScript/PDF stream
 // and stores rendering results in a string buffer.
 class PdfPsMetafile {
  public:
   enum FileFormat {
     PDF,
@@ skipping 45 matching lines @@
 
   // Returns size of PDF/PS contents stored in buffer |all_pages_|.
   // This function should ONLY be called after PDF/PS file is closed.
   unsigned int GetDataSize() const;
 
   // Copies PDF/PS contents stored in buffer |all_pages_| into |dst_buffer|.
   // This function should ONLY be called after PDF/PS file is closed.
   // Returns true only when success.
   bool GetData(void* dst_buffer, size_t dst_buffer_size) const;
 
-  // Saves PDF/PS contents stored in buffer |all_pages_| into |filename| on
-  // the disk.
+  // Saves PDF/PS contents stored in buffer |all_pages_| into the file
+  // associated with |fd|.
   // This function should ONLY be called after PDF/PS file is closed.
-  bool SaveTo(const FilePath& filename) const;
+  bool SaveTo(const base::FileDescriptor& fd) const;
 
  private:
   // Cleans up all resources.
   void CleanUpAll();
 
   FileFormat format_;
 
   // Cairo surface and context for entire PDF/PS file.
   cairo_surface_t* surface_;
   cairo_t* context_;
 
   // Cairo surface and context for current page only.
   cairo_surface_t* page_surface_;
   cairo_t* page_context_;
 
   // Buffer stores PDF/PS contents for entire PDF/PS file.
   std::string all_pages_;
 
   // Buffer stores PDF/PS contents for current page only.
   std::string current_page_;
 
   DISALLOW_COPY_AND_ASSIGN(PdfPsMetafile);
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_PDF_PS_METAFILE_LINUX_H_