SkPDF: add final keyword to leaf classes

Review URL: https://codereview.chromium.org/1461403002

src/pdf/SkDeflate.h

@@ -21,7 +21,7 @@
   *
   * See http://en.wikipedia.org/wiki/DEFLATE
   */
-class SkDeflateWStream : public SkWStream {
+class SkDeflateWStream final : public SkWStream {
 public:
     /** Does not take ownership of the stream. */
     SkDeflateWStream(SkWStream*);

src/pdf/SkPDFBitmap.cpp

@@ -380,7 +380,7 @@ static void emit_image_xobject(SkWStream* stream,
 
 namespace {
 // This SkPDFObject only outputs the alpha layer of the given bitmap.
-class PDFAlphaBitmap : public SkPDFObject {
+class PDFAlphaBitmap final : public SkPDFObject {
 public:
     PDFAlphaBitmap(const SkImage* image) : fImage(SkRef(image)) {}
     ~PDFAlphaBitmap() {}
@@ -399,7 +399,7 @@ private:
 ////////////////////////////////////////////////////////////////////////////////
 
 namespace {
-class PDFDefaultBitmap : public SkPDFObject {
+class PDFDefaultBitmap final : public SkPDFObject {
 public:
     void emitObject(SkWStream* stream,
                     const SkPDFObjNumMap& objNumMap,
@@ -431,7 +431,7 @@ namespace {
  *  Grayscale JFIF Jpeg-encoded data that can be directly embedded
  *  into a PDF.
  */
-class PDFJpegBitmap : public SkPDFObject {
+class PDFJpegBitmap final : public SkPDFObject {
 public:
     SkISize fSize;
     SkAutoTUnref<SkData> fData;

src/pdf/SkPDFDevice.h

@@ -44,7 +44,7 @@ struct RectWithData;
 
     The drawing context for the PDF backend.
 */
-class SkPDFDevice : public SkBaseDevice {
+class SkPDFDevice final : public SkBaseDevice {
 public:
     /** Create a PDF drawing context.  SkPDFDevice applies a
      *  scale-and-translate transform to move the origin from the

src/pdf/SkPDFFontImpl.h

@@ -12,7 +12,7 @@
 
 #include "SkPDFFont.h"
 
-class SkPDFType0Font : public SkPDFFont {
+class SkPDFType0Font final : public SkPDFFont {
 public:
     virtual ~SkPDFType0Font();
     bool multiByteGlyphs() const override { return true; }
@@ -36,7 +36,7 @@ private:
     bool populate(const SkPDFGlyphSet* subset);
 };
 
-class SkPDFCIDFont : public SkPDFFont {
+class SkPDFCIDFont final : public SkPDFFont {
 public:
     virtual ~SkPDFCIDFont();
     virtual bool multiByteGlyphs() const { return true; }
@@ -53,7 +53,7 @@ private:
                            const SkTDArray<uint32_t>* subset);
 };
 
-class SkPDFType1Font : public SkPDFFont {
+class SkPDFType1Font final : public SkPDFFont {
 public:
     virtual ~SkPDFType1Font();
     virtual bool multiByteGlyphs() const { return false; }
@@ -72,7 +72,7 @@ private:
         const SkAdvancedTypefaceMetrics::WidthRange* widthRangeEntry);
 };
 
-class SkPDFType3Font : public SkPDFFont {
+class SkPDFType3Font final : public SkPDFFont {
 public:
     virtual ~SkPDFType3Font();
     virtual bool multiByteGlyphs() const { return false; }

src/pdf/SkPDFFormXObject.h

@@ -30,7 +30,7 @@ class SkPDFObjNumMap;
 // The caller could keep track of the form XObjects it creates and
 // canonicalize them, but the Skia API doesn't provide enough context to
 // automatically do it (trivially).
-class SkPDFFormXObject : public SkPDFStream {
+class SkPDFFormXObject final : public SkPDFStream {
 public:
     /** Create a PDF form XObject. Entries for the dictionary entries are
      *  automatically added.

src/pdf/SkPDFGraphicState.h

@@ -22,7 +22,7 @@ class SkPDFFormXObject;
     be installed. So that a given dictionary is only output to the pdf file
     once, we want to canonicalize them.
 */
-class SkPDFGraphicState : public SkPDFObject {
+class SkPDFGraphicState final : public SkPDFObject {
     
 public:
     enum SkPDFSMaskMode {

src/pdf/SkPDFMetadata.cpp

@@ -183,7 +183,7 @@ static SkString uuid_to_string(const SkPDFMetadata::UUID& uuid) {
 #undef HEXIFY
 
 namespace {
-class PDFXMLObject : public SkPDFObject {
+class PDFXMLObject final : public SkPDFObject {
 public:
     PDFXMLObject(SkString xml) : fXML(skstd::move(xml)) {}
     void emitObject(SkWStream* stream,

src/pdf/SkPDFShader.h

@@ -50,7 +50,7 @@ public:
                                      SkScalar rasterScale);
 };
 
-class SkPDFFunctionShader : public SkPDFDict {
+class SkPDFFunctionShader final : public SkPDFDict {
     
 
 public:
@@ -70,7 +70,7 @@ private:
  * inside a tiling pattern while providing a common pattern interface.
  * The encapsulation allows the use of a SMask for transparency gradients.
  */
-class SkPDFAlphaFunctionShader : public SkPDFStream {
+class SkPDFAlphaFunctionShader final : public SkPDFStream {
 public:
     static SkPDFAlphaFunctionShader* Create(SkPDFCanon*,
                                             SkScalar dpi,
@@ -84,7 +84,7 @@ private:
     typedef SkPDFStream INHERITED;
 };
 
-class SkPDFImageShader : public SkPDFStream {
+class SkPDFImageShader final : public SkPDFStream {
 public:
     static SkPDFImageShader* Create(SkPDFCanon*,
                                     SkScalar dpi,

src/pdf/SkPDFTypes.h

@@ -168,7 +168,7 @@ static_assert(sizeof(SkString) == sizeof(void*), "SkString_size");
 /** This class is a SkPDFUnion with SkPDFObject virtuals attached.
     The only use case of this is when a non-compound PDF object is
     referenced indirectly. */
-class SkPDFAtom : public SkPDFObject {
+class SkPDFAtom final : public SkPDFObject {
 public:
     void emitObject(SkWStream* stream,
                     const SkPDFObjNumMap& objNumMap,
@@ -188,7 +188,7 @@ private:
 
     An array object in a PDF.
 */
-class SkPDFArray : public SkPDFObject {
+class SkPDFArray final : public SkPDFObject {
 public:
     static const int kMaxLen = 8191;
 
@@ -314,7 +314,7 @@ private:
     descriptor). That is: no memory savings can be made by holding on
     to a compressed version instead.
  */
-class SkPDFSharedStream : public SkPDFObject {
+class SkPDFSharedStream final : public SkPDFObject {
 public:
     // Takes ownership of asset.
     SkPDFSharedStream(SkStreamAsset* data) : fAsset(data), fDict(new SkPDFDict) { SkASSERT(data); }