add ability to specify the DPI at which to render the page

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 SkPdfRenderer_DEFINED
 #define SkPdfRenderer_DEFINED
 
 class SkCanvas;
 class SkNativeParsedPDF;
+class SkRect;
 
 // TODO(edisonn): move in another file
 class SkPdfRenderer : public SkRefCnt {
     SkNativeParsedPDF* fPdfDoc;
 public:
     SkPdfRenderer() : fPdfDoc(NULL) {}
     virtual ~SkPdfRenderer() {unload();}
 
     // TODO(edisonn): add options to render forms, or not
-    bool renderPage(int page, SkCanvas* canvas) const;
+    bool renderPage(int page, SkCanvas* canvas, const SkRect& dst) const;

[reed1, 2013/07/11 15:27:13]

Why is this better than just using the matrix on the canvas?

[edisonn, 2013/07/11 15:36:24]

there is some magic I need to do to remap the matrix, since in pdf the (0,0) is
on the bottom left, unlike skia where is top left. I rather have the magic in
the renderpage, rather than any caller to have to implement it.

If I get rid of it, then we can use the matrix

 
     bool load(const SkString inputFileName);
     bool loaded() const {return fPdfDoc != NULL;}
     int pages() const;
     void unload();
     SkRect MediaBox(int page) const;
     size_t bytesUsed() const;
 };
 
 void reportPdfRenderStats();
 
 #endif  // SkPdfRenderer_DEFINED