SkPDF: skpdfdocument and skpdfpage use skpdfdevice in a const way

src/pdf/SkPDFDocument.h

 
 /*
  * Copyright 2010 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkPDFDocument_DEFINED
 #define SkPDFDocument_DEFINED
 
 #include "SkAdvancedTypefaceMetrics.h"
-#include "SkRefCnt.h"
+#include "SkPDFDevice.h"
 #include "SkTDArray.h"
-#include "SkTemplates.h"
 
-class SkPDFCatalog;
-class SkPDFDevice;
-class SkPDFDict;
-class SkPDFPage;
-class SkPDFObject;
 class SkWStream;
-template <typename T> class SkTSet;
 
 /** \class SkPDFDocument
 
     A SkPDFDocument assembles pages together and generates the final PDF file.
 */
 class SkPDFDocument {
 public:
     SkPDFDocument();
     ~SkPDFDocument();
 
     /** Output the PDF to the passed stream.  It is an error to call this (it
      *  will return false and not modify stream) if no pages have been added
      *  or there are pages missing (i.e. page 1 and 3 have been added, but not
      *  page 2).
      *
      *  @param stream    The writable output stream to send the PDF to.
      */
     bool emitPDF(SkWStream* stream);
 
     /** Append the passed pdf device to the document as a new page.  Returns
      *  true if successful.  Will fail if the document has already been emitted.
      *
      *  @param pdfDevice The page to add to this document.
      */
-    bool appendPage(SkPDFDevice* pdfDevice) {
+    bool appendPage(const SkPDFDevice* pdfDevice) {
         fPageDevices.push(SkRef(pdfDevice));
         return true;
     }
 
     /** Get the count of unique font types used in the document.
      */
     void getCountOfFontTypes(
         int counts[SkAdvancedTypefaceMetrics::kOther_Font + 1],
         int* notSubsettableCount,
         int* notEmbedddableCount) const;
 
 private:
-    SkTDArray<SkPDFDevice*> fPageDevices;
+    SkTDArray<const SkPDFDevice*> fPageDevices;
 };
 
 #endif