add flatten/unflatten to SkDataSet

Review URL: https://codereview.appspot.com/6374057

git-svn-id: http://skia.googlecode.com/svn/trunk@4548 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 16 insertions, 0 deletions

diff --git a/include/core/SkDataSet.h b/include/core/SkDataSet.h
index eed8c20a24..781cd6ced6 100644
--- a/include/core/SkDataSet.h
+++ b/include/core/SkDataSet.h
@@ -13,9 +13,22 @@
 
 class SkStream;
 class SkWStream;
+class SkFlattenableReadBuffer;
+class SkFlattenableWriteBuffer;
 
 class SkDataSet : public SkRefCnt {
 public:
+    /**
+     *  Returns a new empty dataset. Note: since SkDataSet is immutable, this
+     *  "new" set may be the same one that was returned before, but each
+     *  returned object must have its reference-count balanced regardles.
+     *
+     *  SkDataSet* empty = SkDataSet::NewEmpty();
+     *  ...
+     *  empty->unref();
+     */
+    static SkDataSet* NewEmpty();
+
     struct Pair {
         const char* fKey;
         SkData*     fValue;
@@ -60,6 +73,9 @@ public:
     explicit SkDataSet(SkStream*);
     void writeToStream(SkWStream*) const;
 
+    explicit SkDataSet(SkFlattenableReadBuffer&);
+    void flatten(SkFlattenableWriteBuffer&) const;
+
 private:
     int32_t     fCount;
     uint32_t    fKeySize;