(upload draf code for backup) pdfviewer: improve memory, son't allocate extra buffers, and put the …

experimental/PdfViewer/SkPdfBasics.h

 #ifndef __DEFINED__SkPdfBasics
 #define __DEFINED__SkPdfBasics
 
 #include "SkCanvas.h"
 #include "SkPaint.h"
 #include "SkPdfConfig.h"
 
 #include <iostream>
 #include <cstdio>
 #include <map>
 #include <stack>
 
 class SkPdfFont;
 class SkPdfDoc;
 class SkPdfObject;
 class SkPdfResourceDictionary;
 
 class SkNativeParsedPDF;
+class SkPdfAllocator;
 
 // TODO(edisonn): better class design.
 struct SkPdfColorOperator {
     // does not own the char*
-    const char* fColorSpace;  // TODO(edisonn): use SkString, or even char*
+    NotOwnedString fColorSpace;
     SkColor fColor;
     double fOpacity;  // ca or CA
     // TODO(edisonn): add here other color space options.
 
     void setRGBColor(SkColor color) {
         // TODO(edisonn): ASSERT DeviceRGB is the color space.
         fColor = color;
     }
     // TODO(edisonn): double check the default values for all fields.
-    SkPdfColorOperator() : fColorSpace(NULL), fColor(SK_ColorBLACK), fOpacity(1) {}
+    SkPdfColorOperator() : fColor(SK_ColorBLACK), fOpacity(1) {
+        NotOwnedString::init(&fColorSpace);
+    }
 
     void applyGraphicsState(SkPaint* paint) {
         paint->setColor(SkColorSetA(fColor, fOpacity * 255));
     }
 };
 
 // TODO(edisonn): better class design.
 struct SkPdfGraphicsState {
     SkMatrix            fMatrix;
     SkMatrix            fMatrixTm;
@@ skipping 66 matching lines @@
     std::string fImageData;
 };
 
 // TODO(edisonn): better class design.
 // TODO(edisonn): rename to SkPdfContext
 struct PdfContext {
     std::stack<SkPdfObject*>        fObjectStack;
     std::stack<SkPdfGraphicsState>  fStateStack;
     SkPdfGraphicsState              fGraphicsState;
     SkNativeParsedPDF*              fPdfDoc;
+    // TODO(edisonn): the allocator, could be freed after the page is done drawing.
+    SkPdfAllocator*                 fTmpPageAllocator;
     SkMatrix                        fOriginalMatrix;
 
     SkPdfInlineImage                fInlineImage;
 
-    PdfContext(SkNativeParsedPDF* doc) :  fPdfDoc(doc) {}
-
+    PdfContext(SkNativeParsedPDF* doc);
+    ~PdfContext();
 };
 
 // TODO(edisonn): temporary code, to report how much of the PDF we actually think we rendered.
 // TODO(edisonn): rename to SkPdfResult
 enum PdfResult {
     kOK_PdfResult,
     kPartial_PdfResult,
     kNYI_PdfResult,
     kIgnoreError_PdfResult,
     kError_PdfResult,
     kUnsupported_PdfResult,
 
     kCount_PdfResult
 };
 
 #endif  // __DEFINED__SkPdfBasics