SkPDF: Simplify PDFStream / emitObject() const

src/pdf/SkPDFTypes.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 SkPDFTypes_DEFINED
 #define SkPDFTypes_DEFINED
@@ skipping 22 matching lines @@
     
 
     /** Subclasses must implement this method to print the object to the
      *  PDF file.
      *  @param catalog  The object catalog to use.
      *  @param stream   The writable output stream to send the output to.
      */
     // TODO(halcanary): make this method const
     virtual void emitObject(SkWStream* stream,
                             const SkPDFObjNumMap& objNumMap,
-                            const SkPDFSubstituteMap& substitutes) = 0;
+                            const SkPDFSubstituteMap& substitutes) const = 0;
 
     /**
      *  Adds all transitive dependencies of this object to the
      *  catalog.  Implementations should respect the catalog's object
      *  substitution map.
      */
     virtual void addResources(SkPDFObjNumMap* catalog,
                               const SkPDFSubstituteMap& substitutes) const {}
 
 private:
@@ skipping 139 matching lines @@
     static const int kMaxLen = 8191;
 
     /** Create a PDF array. Maximum length is 8191.
      */
     SkPDFArray();
     virtual ~SkPDFArray();
 
     // The SkPDFObject interface.
     void emitObject(SkWStream* stream,
                     const SkPDFObjNumMap& objNumMap,
-                    const SkPDFSubstituteMap& substitutes) override;
+                    const SkPDFSubstituteMap& substitutes) const override;
     void addResources(SkPDFObjNumMap*,
                       const SkPDFSubstituteMap&) const override;
 
     /** The size of the array.
      */
     int size() const;
 
     /** Preallocate space for the given number of entries.
      *  @param length The number of array slots to preallocate.
      */
@@ skipping 34 matching lines @@
     /** Create a PDF dictionary with a Type entry.
      *  @param type   The value of the Type entry.
      */
     explicit SkPDFDict(const char type[]);
 
     virtual ~SkPDFDict();
 
     // The SkPDFObject interface.
     void emitObject(SkWStream* stream,
                     const SkPDFObjNumMap& objNumMap,
-                    const SkPDFSubstituteMap& substitutes) override;
+                    const SkPDFSubstituteMap& substitutes) const override;
     void addResources(SkPDFObjNumMap*,
                       const SkPDFSubstituteMap&) const override;
 
     /** The size of the dictionary.
      */
     int size() const;
 
     /** Add the value to the dictionary with the given key.  Takes
      *  ownership of the object.
      *  @param key   The text of the key for this dictionary entry.
@@ skipping 83 matching lines @@
 
     SkPDFObject* operator()(SkPDFObject* o) const {
         return this->getSubstitute(o);
     }
 
 private:
     SkTHashMap<SkPDFObject*, SkPDFObject*> fSubstituteMap;
 };
 
 #endif