pdfviewer: add indexed rbg image support, enhanche caching(setData) for SkPdfObject

experimental/PdfViewer/pdfparser/native/SkNativeParsedPDF.cpp

 #include "SkNativeParsedPDF.h"
 #include "SkPdfNativeTokenizer.h"
 #include "SkPdfBasics.h"
 #include "SkPdfObject.h"
 
 #include <stdio.h>
 #include <string.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 
@@ skipping 288 matching lines @@
     current = nextObject(0, current, trailerEnd, &token, fAllocator, NULL);
     if (!token.isDictionary()) {
         return current;
     }
     SkPdfFileTrailerDictionary* trailer = (SkPdfFileTrailerDictionary*)&token;
     if (!trailer->valid()) {
         return current;
     }
 
     if (storeCatalog) {
-        const SkPdfObject* ref = trailer->Root(NULL);
+        SkPdfObject* ref = trailer->Root(NULL);
         if (ref == NULL || !ref->isReference()) {
             // TODO(edisonn): oops, we have to fix the corrup pdf file
             return current;
         }
         fRootCatalogRef = ref;
     }
 
     if (trailer->has_Prev()) {
         *prev = (long)trailer->Prev(NULL);
     }
@@ skipping 57 matching lines @@
     }
 
     current = nextObject(1, current, end, dict, fAllocator, this);
 
     // TODO(edisonn): report warning/error - verify last token is endobj
 
     return dict;
 }
 
 void SkNativeParsedPDF::fillPages(SkPdfPageTreeNodeDictionary* tree) {
-    const SkPdfArray* kids = tree->Kids(this);
+    SkPdfArray* kids = tree->Kids(this);
     if (kids == NULL) {
         *fPages.append() = (SkPdfPageObjectDictionary*)tree;
         return;
     }
 
     int cnt = kids->size();
     for (int i = 0; i < cnt; i++) {
-        const SkPdfObject* obj = resolveReference(kids->objAtAIndex(i));
+        SkPdfObject* obj = resolveReference(kids->objAtAIndex(i));
         if (fMapper->mapPageObjectDictionary(obj) != kPageObjectDictionary_SkPdfObjectType) {
             *fPages.append() = (SkPdfPageObjectDictionary*)obj;
         } else {
             // TODO(edisonn): verify that it is a page tree indeed
             fillPages((SkPdfPageTreeNodeDictionary*)obj);
         }
     }
 }
 
 int SkNativeParsedPDF::pages() const {
@@ skipping 93 matching lines @@
     SkPdfObject::makeString(sz, len, obj);
     return (SkPdfString*)obj;
 }
 
 SkPdfAllocator* SkNativeParsedPDF::allocator() const {
     return fAllocator;
 }
 
 // TODO(edisonn): fix infinite loop if ref to itself!
 // TODO(edisonn): perf, fix refs at load, and resolve will simply return fResolvedReference?
-SkPdfObject* SkNativeParsedPDF::resolveReference(const SkPdfObject* ref) {
+SkPdfObject* SkNativeParsedPDF::resolveReference(SkPdfObject* ref) {
     if (ref && ref->isReference()) {
         int id = ref->referenceId();
         // TODO(edisonn): generation/updates not supported now
         //int gen = ref->referenceGeneration();
 
         // TODO(edisonn): verify id and gen expected
         if (id < 0 || id >= fObjects.count()) {
             // TODO(edisonn): report error/warning
             return NULL;
         }
@@ skipping 31 matching lines @@
     return (SkPdfObject*)ref;
 }
 
 size_t SkNativeParsedPDF::bytesUsed() const {
     return fAllocator->bytesUsed() +
            fContentLength +
            fObjects.count() * sizeof(PublicObjectEntry) +
            fPages.count() * sizeof(SkPdfPageObjectDictionary*) +
            sizeof(*this);
 }