Implement limited paged media support for linux.

printing/pdf_ps_metafile_cairo.h

 // Copyright (c) 2010 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_CAIRO_H_
 #define PRINTING_PDF_PS_METAFILE_CAIRO_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 35 matching lines @@
   // |src_buffer| should point to the shared memory which stores PDF/PS
   // contents generated in the renderer.
   // Note: Only call in the browser to initialize |data_|.
   bool Init(const void* src_buffer, uint32 src_buffer_size);
 
   FileFormat GetFileFormat() const { return format_; }
 
   // Prepares a new cairo surface/context for rendering a new page.
   // The unit is in point (=1/72 in).
   // Returns NULL when failed.
-  cairo_t* StartPage(double width, double height);
+  cairo_t* StartPage(double width_in_points,
+                     double height_in_points,
+                     double margin_top_in_points,
+                     double margin_right_in_points,
+                     double margin_bottom_in_points,
+                     double margin_left_in_points);
 
   // Destroys the surface and the context used in rendering current page.
   // The results of current page will be appended into buffer |data_|.
   // Returns true on success.
   bool FinishPage();
 
   // Closes resulting PDF/PS file. No further rendering is allowed.
   void Close();
 
   // Returns size of PDF/PS contents stored in buffer |data_|.
   // This function should ONLY be called after PDF/PS file is closed.
   uint32 GetDataSize() const;
 
   // Copies PDF/PS contents stored in buffer |data_| 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, uint32 dst_buffer_size) const;
 
   // Saves PDF/PS contents stored in buffer |data_| into the file
   // associated with |fd|.
   // This function should ONLY be called after PDF/PS file is closed.
   bool SaveTo(const base::FileDescriptor& fd) const;
 
   // The hardcoded margins, in points. These values are based on 72 dpi,
   // with 0.25 margins on top, left, and right, and 0.56 on bottom.
-  static const double kTopMargin;
-  static const double kRightMargin;
-  static const double kBottomMargin;
-  static const double kLeftMargin;
+  static const double kTopMarginInInch;
+  static const double kRightMarginInInch;
+  static const double kBottomMarginInInch;
+  static const double kLeftMarginInInch;
 
  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_;
 
   // Buffer stores PDF/PS contents for entire PDF/PS file.
   std::string data_;
 
   DISALLOW_COPY_AND_ASSIGN(PdfPsMetafile);
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_PDF_PS_METAFILE_CAIRO_H_