TTC support for DirectWrite.

include/utils/win/SkTScopedComPtr.h

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkSkTScopedPtr_DEFINED
 #define SkSkTScopedPtr_DEFINED
 
 #include "SkTypes.h"
 #include "SkTemplates.h"
 
 template<typename T>
 class SkBlockComRef : public T {
 private:
     virtual ULONG STDMETHODCALLTYPE AddRef(void) = 0;
     virtual ULONG STDMETHODCALLTYPE Release(void) = 0;
 };
 
 template<typename T> T* SkRefComPtr(T* ptr) {
     ptr->AddRef();
     return ptr;
 }
 
+template<typename T> T* SkSafeRefComPtr(T* ptr) {
+    if (ptr) {
+        ptr->AddRef();
+    }
+    return ptr;
+}
+
 template<typename T>
 class SkTScopedComPtr : SkNoncopyable {
 private:
     T *fPtr;
 
 public:
     explicit SkTScopedComPtr(T *ptr = NULL) : fPtr(ptr) { }
     ~SkTScopedComPtr() {
         this->reset();
     }
@@ skipping 23 matching lines @@
     }
 
     T* release() {
         T* temp = this->fPtr;
         this->fPtr = NULL;
         return temp;
     }
 };
 
 #endif