Pdfviewer refactoring.

experimental/PdfViewer/inc/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 SkPdfRenderer_DEFINED
 #define SkPdfRenderer_DEFINED
 
-// TODO(edisonn): remove this dependency, and load only from a stream!
-#include "SkString.h"
+#include "SkTypes.h"
 
 class SkBitmap;
 class SkCanvas;
 class SkPdfNativeDoc;
 struct SkRect;
 class SkStream;
-class SkString;
 
 // What kind of content to render.
+// FIXME: Currently unused.
 enum SkPdfContent {
     kNoForms_SkPdfContent,
     kAll_SkPdfContent,
 };
 
 /** \class SkPdfRenderer
  *
  *  The SkPdfRenderer class is used to render a PDF into canvas.
  *
  */
-class SkPdfRenderer {
+class SkPdfRenderer : public SkNoncopyable {
 public:
-    SkPdfRenderer() : fPdfDoc(NULL) {}
-    virtual ~SkPdfRenderer() {unload();}
+    // Create a new renderer from a stream.
+    // TODO(edisonn): replace it with a SkSmartStream which would know to to efficiently
+    // deal with a HTTP stream.
+    // FIXME: Untested.
+    static SkPdfRenderer* CreateFromStream(SkStream*);
+    // Create a new renderer from a file.
+    static SkPdfRenderer* CreateFromFile(const char* filename);
+
+    ~SkPdfRenderer();
 
     // Render a specific page into the canvas, in a specific rectangle.
     bool renderPage(int page, SkCanvas* canvas, const SkRect& dst) const;
 
-    // TODO(edisonn): deprecated, should be removed!
-    bool load(const SkString inputFileName);
-
-    // TODO(edisonn): replace it with a SkSmartStream which would know to to efficiently
-    // deal with a HTTP stream.
-    bool load(SkStream* stream);
-
-    // Unloads the pdf document.
-    void unload();
-
-    // Returns true if we succesfully loaded a document.
-    bool loaded() const {return fPdfDoc != NULL && pages() > 0;}
-
     // Returns the number of pages in the loaded pdf.
     int pages() const;
 
     // Returns the MediaBox of a page. Can be used by client to crate a canvas.
     SkRect MediaBox(int page) const;
 
     // TODO(edisonn): for testing only, probably it should be removed, unless some client wants to
     // let users know how much memory the PDF needs.
     size_t bytesUsed() const;
 
 private:
+    // Takes ownership of SkPdfNativeDoc.
+    SkPdfRenderer(SkPdfNativeDoc*);
     SkPdfNativeDoc* fPdfDoc;
 };
 
 // For testing only, reports stats about rendering, like how many operations failed, or are NYI, ...
 void reportPdfRenderStats();
 
 // Renders a page of a pdf in a bitmap.
 bool SkPDFNativeRenderToBitmap(SkStream* stream,
                                SkBitmap* output,
                                int page = 0,
                                SkPdfContent content = kAll_SkPdfContent,
                                double dpi = 72.0);
 
 // TODO(edisonn): add options to render forms, checkboxes, ...
 // TODO(edisonn): Add API for Forms viewing and editing
 // e.g. SkBitmap getPage(int page);
 //      int formsCount();
 //      SkForm getForm(int formID); // SkForm(SkRect, .. other data)
 // TODO (edisonn): Add intend when loading pdf, for example: for viewing, for parsing content, ...
 
 #endif  // SkPdfRenderer_DEFINED