SkPDF: Simplify PDFStream / emitObject() const

src/pdf/SkPDFStream.h

Index: src/pdf/SkPDFStream.h
diff --git a/src/pdf/SkPDFStream.h b/src/pdf/SkPDFStream.h
index d29d9b19badc352071c0866173b282d166af8888..c5961d42b1a6b0d45075d6350070206adbdd182c 100644
--- a/src/pdf/SkPDFStream.h
+++ b/src/pdf/SkPDFStream.h
@@ -27,50 +27,38 @@ class SkPDFStream : public SkPDFDict {
 public:
     /** Create a PDF stream. A Length entry is automatically added to the
      *  stream dictionary.
-     *  @param data   The data part of the stream.  Will be ref()ed.
+     *  @param data   The data part of the stream.  Will not take ownership.
      */
-    explicit SkPDFStream(SkData* data);
+    explicit SkPDFStream(SkData* data) { this->setData(data); }
 
     /** Create a PDF stream. A Length entry is automatically added to the
      *  stream dictionary.
-     *  @param stream The data part of the stream.  Will be duplicate()d.
+     *  @param stream The data part of the stream.  Will not take ownership.
      */
-    explicit SkPDFStream(SkStream* stream);
+    explicit SkPDFStream(SkStream* stream) { this->setData(stream); }
 
     virtual ~SkPDFStream();
 
     // The SkPDFObject interface.
     void emitObject(SkWStream* stream,
                     const SkPDFObjNumMap& objNumMap,
-                    const SkPDFSubstituteMap& substitutes) override;
+                    const SkPDFSubstituteMap& substitutes) const override;
 
 protected:
-    enum State {
-        kUnused_State,         //!< The stream hasn't been requested yet.
-        kNoCompression_State,  //!< The stream's been requested in an
-                               //   uncompressed form.
-        kCompressed_State,     //!< The stream's already been compressed.
-    };
-
     /* Create a PDF stream with no data.  The setData method must be called to
      * set the data.
      */
-    SkPDFStream();
+    SkPDFStream() {}
 
-    void setData(SkData* data);
+    /** Only call this function once. */
     void setData(SkStream* stream);
-
-    size_t dataSize() const;
-
-    void setState(State state) {
-        fState = state;
+    void setData(SkData* data) {
+        SkMemoryStream memoryStream(data);
+        this->setData(&memoryStream);
     }
 
 private:
-    // Indicates what form (or if) the stream has been requested.
-    State fState;
-
-    SkAutoTDelete<SkStreamRewindable> fDataStream;
+    SkAutoTDelete<SkStreamRewindable> fCompressedData;
 
     typedef SkPDFDict INHERITED;
 };