SkPDF: Refactor SkPDFObject heiararchy.

src/doc/SkDocument_PDF.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkDocument.h"
 #include "SkPDFCanon.h"
 #include "SkPDFDevice.h"
@@ skipping 76 matching lines @@
                                SkPDFDict** rootNode) {
     // PDF wants a tree describing all the pages in the document.  We arbitrary
     // choose 8 (kNodeSize) as the number of allowed children.  The internal
     // nodes have type "Pages" with an array of children, a parent pointer, and
     // the number of leaves below the node as "Count."  The leaves are passed
     // into the method, have type "Page" and need a parent pointer. This method
     // builds the tree bottom up, skipping internal nodes that would have only
     // one child.
     static const int kNodeSize = 8;
 
-    SkAutoTUnref<SkPDFName> kidsName(new SkPDFName("Kids"));
-    SkAutoTUnref<SkPDFName> countName(new SkPDFName("Count"));
-    SkAutoTUnref<SkPDFName> parentName(new SkPDFName("Parent"));
-
     // curNodes takes a reference to its items, which it passes to pageTree.
     SkTDArray<SkPDFDict*> curNodes;
     curNodes.setReserve(pages.count());
     for (int i = 0; i < pages.count(); i++) {
         SkSafeRef(pages[i]);
         curNodes.push(pages[i]);
     }
 
     // nextRoundNodes passes its references to nodes on to curNodes.
     SkTDArray<SkPDFDict*> nextRoundNodes;
     nextRoundNodes.setReserve((pages.count() + kNodeSize - 1)/kNodeSize);
 
     int treeCapacity = kNodeSize;
     do {
         for (int i = 0; i < curNodes.count(); ) {
             if (i > 0 && i + 1 == curNodes.count()) {
                 nextRoundNodes.push(curNodes[i]);
                 break;
             }
 
             SkPDFDict* newNode = new SkPDFDict("Pages");
             SkAutoTUnref<SkPDFObjRef> newNodeRef(new SkPDFObjRef(newNode));
 
             SkAutoTUnref<SkPDFArray> kids(new SkPDFArray);
             kids->reserve(kNodeSize);
 
             int count = 0;
             for (; i < curNodes.count() && count < kNodeSize; i++, count++) {
-                curNodes[i]->insert(parentName.get(), newNodeRef.get());
+                curNodes[i]->insert("Parent", newNodeRef.get());
                 kids->append(new SkPDFObjRef(curNodes[i]))->unref();
 
                 // TODO(vandebo): put the objects in strict access order.
                 // Probably doesn't matter because they are so small.
                 if (curNodes[i] != pages[0]) {
                     pageTree->push(curNodes[i]);  // Transfer reference.
                 } else {
                     SkSafeUnref(curNodes[i]);
                 }
             }
 
             // treeCapacity is the number of leaf nodes possible for the
             // current set of subtrees being generated. (i.e. 8, 64, 512, ...).
             // It is hard to count the number of leaf nodes in the current
             // subtree. However, by construction, we know that unless it's the
             // last subtree for the current depth, the leaf count will be
             // treeCapacity, otherwise it's what ever is left over after
             // consuming treeCapacity chunks.
             int pageCount = treeCapacity;
             if (i == curNodes.count()) {
                 pageCount = ((pages.count() - 1) % treeCapacity) + 1;
             }
-            newNode->insert(countName.get(), new SkPDFInt(pageCount))->unref();
-            newNode->insert(kidsName.get(), kids.get());
+            newNode->insert("Count", new SkPDFInt(pageCount))->unref();
+            newNode->insert("Kids", kids.get());
             nextRoundNodes.push(newNode);  // Transfer reference.
         }
 
         curNodes = nextRoundNodes;
         nextRoundNodes.rewind();
         treeCapacity *= kNodeSize;
     } while (curNodes.count() > 1);
 
     pageTree->push(curNodes[0]);  // Transfer reference.
     if (rootNode) {
@@ skipping 195 matching lines @@
 
 SkDocument* SkDocument::CreatePDF(const char path[], SkScalar dpi) {
     SkFILEWStream* stream = SkNEW_ARGS(SkFILEWStream, (path));
     if (!stream->isValid()) {
         SkDELETE(stream);
         return NULL;
     }
     auto delete_wstream = [](SkWStream* stream, bool) { SkDELETE(stream); };
     return SkNEW_ARGS(SkDocument_PDF, (stream, delete_wstream, dpi));
 }