pdf viewer: refactor and fix a bug (SkPdfobject should not reset on destruct)

experimental/PdfViewer/SkPdfRenderer.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkPdfParser_DEFINED
 #define SkPdfParser_DEFINED
 
 #include "SkPdfBasics.h"
 #include "SkPdfNativeTokenizer.h"
 
 extern "C" PdfContext* gPdfContext;
 extern "C" SkBitmap* gDumpBitmap;
 extern "C" SkCanvas* gDumpCanvas;
 
-// TODO(edisonn): Document PdfTokenLooper and subclasses.
-class PdfTokenLooper {
-protected:
-    PdfTokenLooper* fParent;
-    SkPdfNativeTokenizer* fTokenizer;
-    PdfContext* fPdfContext;
-    SkCanvas* fCanvas;
-
-public:
-    PdfTokenLooper(PdfTokenLooper* parent,
-                   SkPdfNativeTokenizer* tokenizer,
-                   PdfContext* pdfContext,
-                   SkCanvas* canvas)
-        : fParent(parent), fTokenizer(tokenizer), fPdfContext(pdfContext), fCanvas(canvas) {}
-
-    virtual ~PdfTokenLooper() {}
-
-    virtual PdfResult consumeToken(PdfToken& token) = 0;
-    virtual void loop() = 0;
-
-    void setUp(PdfTokenLooper* parent) {
-        fParent = parent;
-        fTokenizer = parent->fTokenizer;
-        fPdfContext = parent->fPdfContext;
-        fCanvas = parent->fCanvas;
-    }
-};
-
-class PdfMainLooper : public PdfTokenLooper {
-public:
-    PdfMainLooper(PdfTokenLooper* parent,
-                  SkPdfNativeTokenizer* tokenizer,
-                  PdfContext* pdfContext,
-                  SkCanvas* canvas)
-        : PdfTokenLooper(parent, tokenizer, pdfContext, canvas) {}
-
-    virtual PdfResult consumeToken(PdfToken& token);
-    virtual void loop();
-};
-
-class PdfInlineImageLooper : public PdfTokenLooper {
-public:
-    PdfInlineImageLooper()
-        : PdfTokenLooper(NULL, NULL, NULL, NULL) {}
-
-    virtual PdfResult consumeToken(PdfToken& token);
-    virtual void loop();
-    PdfResult done();
-};
-
-class PdfCompatibilitySectionLooper : public PdfTokenLooper {
-public:
-    PdfCompatibilitySectionLooper()
-        : PdfTokenLooper(NULL, NULL, NULL, NULL) {}
-
-    virtual PdfResult consumeToken(PdfToken& token);
-    virtual void loop();
-};
+class SkCanvas;
+class SkNativeParsedPDF;
 
 // TODO(edisonn): move in another file
-class SkPdfViewer : public SkRefCnt {
+class SkPdfRenderer : public SkRefCnt {
+    SkNativeParsedPDF* fPdfDoc;
 public:
+    SkPdfRenderer() : fPdfDoc(NULL) {}
+    virtual ~SkPdfRenderer() {unload();}
 
-  bool load(const SkString inputFileName, SkPicture* out);
-  bool write(void*) const { return false; }
+    // TODO(edisonn): add options to render forms, or not
+    bool renderPage(int page, SkCanvas* canvas) const;
+
+    bool load(const SkString inputFileName);
+    bool loaded() const {return fPdfDoc != NULL;}
+    int pages() const;
+    void unload();
+    SkRect MediaBox(int page) const;
 };
 
 void reportPdfRenderStats();
 
 #endif  // SkPdfParser_DEFINED