Rasterize page before printing.

printing/emf_win.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 PRINTING_EMF_WIN_H_
 #define PRINTING_EMF_WIN_H_
 
 #include <windows.h>
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
 #include "printing/metafile.h"
 
 class FilePath;
 
 namespace gfx {
 class Rect;
 class Size;
 }
 
 namespace printing {
 
+// http://msdn2.microsoft.com/en-us/library/ms535522.aspx
+// Windows 2000/XP: When a page in a spooled file exceeds approximately 350
+// MB, it can fail to print and not send an error message.
+const size_t kMetafileMaxSize = 350*1024*1024;
+
 // Simple wrapper class that manage an EMF data stream and its virtual HDC.
 class PRINTING_EXPORT Emf : public Metafile {
  public:
   class Record;
   class Enumerator;
   struct EnumerationContext;
 
   // Generates a virtual HDC that will record every GDI commands and compile
   // it in a EMF data stream.
   Emf();
@@ skipping 43 matching lines @@
     return hdc_;
   }
 
   virtual bool Playback(HDC hdc, const RECT* rect) const OVERRIDE;
   virtual bool SafePlayback(HDC hdc) const OVERRIDE;
 
   virtual HENHMETAFILE emf() const OVERRIDE {
     return emf_;
   }
 
+  // Returns true if metafile contains alpha blend.
+  bool IsAlphaBlendUsed() const;
+
+  // Returns new metafile with only bitmap created by playback of the current
+  // metafile. Returns NULL if fails.
+  Emf* RasterizeMetafile(int raster_area_in_pixels) const;
+
  private:
   FRIEND_TEST_ALL_PREFIXES(EmfTest, DC);
   FRIEND_TEST_ALL_PREFIXES(EmfPrintingTest, PageBreak);
   FRIEND_TEST_ALL_PREFIXES(EmfTest, FileBackedEmf);
 
   // Retrieves the underlying data stream. It is a helper function.
   bool GetDataAsVector(std::vector<uint8>* buffer) const;
 
   // Playbacks safely one EMF record.
   static int CALLBACK SafePlaybackProc(HDC hdc,
@@ skipping 81 matching lines @@
   std::vector<Record> items_;
 
   EnumerationContext context_;
 
   DISALLOW_COPY_AND_ASSIGN(Enumerator);
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_EMF_WIN_H_