PDF : New factory function for SkPDFDevice

src/pdf/SkPDFCanon.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef SkPDFCanon_DEFINED
 #define SkPDFCanon_DEFINED
 
 #include "SkPDFShader.h"
@@ skipping 55 matching lines @@
     void removeImageShader(SkPDFImageShader*);
 
     SkPDFGraphicState* findGraphicState(const SkPaint&) const;
     void addGraphicState(SkPDFGraphicState*);
     void removeGraphicState(SkPDFGraphicState*);
 
     SkPDFBitmap* findBitmap(const SkBitmap&) const;
     void addBitmap(SkPDFBitmap*);
     void removeBitmap(SkPDFBitmap*);
 
+    void assertEmpty() const {
+        SkASSERT(fFontRecords.isEmpty());
+        SkASSERT(fFunctionShaderRecords.isEmpty());
+        SkASSERT(fAlphaShaderRecords.isEmpty());
+        SkASSERT(fImageShaderRecords.isEmpty());
+        SkASSERT(fGraphicStateRecords.isEmpty());
+        SkASSERT(fBitmapRecords.isEmpty());
+    }
+
 private:
     struct FontRec {
         SkPDFFont* fFont;
         uint32_t fFontID;
         uint16_t fGlyphID;
     };
     SkTDArray<FontRec> fFontRecords;
 
     SkTDArray<SkPDFFunctionShader*> fFunctionShaderRecords;
 
     SkTDArray<SkPDFAlphaFunctionShader*> fAlphaShaderRecords;
 
     SkTDArray<SkPDFImageShader*> fImageShaderRecords;
 
     SkTDArray<SkPDFGraphicState*> fGraphicStateRecords;
 
     SkTDArray<SkPDFBitmap*> fBitmapRecords;
 };
 #endif  // SkPDFCanon_DEFINED