Rasterize page before printing.

printing/emf_win.h

Index: printing/emf_win.h
diff --git a/printing/emf_win.h b/printing/emf_win.h
index b593e24f357ea51234bf24cc512248e86a477781..ca59c8e1730a6a0bb72fff49682b9113b2d3072c 100644
--- a/printing/emf_win.h
+++ b/printing/emf_win.h
@@ -23,6 +23,11 @@ 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:
@@ -184,6 +189,14 @@ class PRINTING_EXPORT Emf::Enumerator {
   DISALLOW_COPY_AND_ASSIGN(Enumerator);
 };
 
+// Returns true if metafile contains alpha blend.
+PRINTING_EXPORT bool IsAlphaBlendUsed(const Emf& metafile);
+
+// Returns new metafile with only bitmap created by playback of the current
+// metafile. Returns NULL if fails.
+PRINTING_EXPORT Emf* RasterizeMetafile(const Emf& metafile,
+                                       int raster_area_in_pixels);
+
 }  // namespace printing
 
 #endif  // PRINTING_EMF_WIN_H_