grab from latest android



git-svn-id: http://skia.googlecode.com/svn/trunk@27 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/animator/SkDisplayAdd.h b/src/animator/SkDisplayAdd.h
new file mode 100644
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+++ b/src/animator/SkDisplayAdd.h
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+/* libs/graphics/animator/SkDisplayAdd.h
+**
+** Copyright 2006, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License"); 
+** you may not use this file except in compliance with the License. 
+** You may obtain a copy of the License at 
+**
+**     http://www.apache.org/licenses/LICENSE-2.0 
+**
+** Unless required by applicable law or agreed to in writing, software 
+** distributed under the License is distributed on an "AS IS" BASIS, 
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
+** See the License for the specific language governing permissions and 
+** limitations under the License.
+*/
+
+#ifndef SkDisplayAdd_DEFINED
+#define SkDisplayAdd_DEFINED
+
+#include "SkDrawable.h"
+#include "SkMemberInfo.h"
+
+class SkAdd : public SkDrawable {
+    DECLARE_MEMBER_INFO(Add);
+    SkAdd();
+    
+    enum Mode {
+        kMode_indirect,
+        kMode_immediate
+    };
+    
+    virtual SkDisplayable* deepCopy(SkAnimateMaker* );
+    virtual bool draw(SkAnimateMaker& );
+#ifdef SK_DUMP_ENABLED
+    virtual void dump(SkAnimateMaker* );
+#endif
+    virtual bool enable(SkAnimateMaker& );
+    virtual bool hasEnable() const;
+    virtual void initialize();
+    virtual bool isDrawable() const;
+protected:
+//  struct _A {
+        Mode mode;
+        int32_t offset;
+        SkDrawable* use;
+        SkDrawable* where;  // if NULL, offset becomes index
+//  } A;
+private:
+    typedef SkDrawable INHERITED;
+};
+
+class SkClear : public SkDisplayable {
+    virtual bool enable(SkAnimateMaker& );
+};
+
+class SkMove : public SkAdd {
+    DECLARE_MEMBER_INFO(Move);
+private:
+    typedef SkAdd INHERITED;
+};
+
+class SkRemove : public SkAdd {
+    DECLARE_MEMBER_INFO(Remove);
+    SkRemove();
+protected:
+    SkBool fDelete;
+private:
+    friend class SkAdd;
+    typedef SkAdd INHERITED;
+};
+
+class SkReplace : public SkAdd {
+    DECLARE_MEMBER_INFO(Replace);
+private:
+    typedef SkAdd INHERITED;
+};
+
+#endif // SkDisplayAdd_DEFINED
+
+