add optional SkAlphaType parameter to notifyPixelsChanged

include/core/SkPixelRef.h

-
 /*
  * Copyright 2008 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
-
 #ifndef SkPixelRef_DEFINED
 #define SkPixelRef_DEFINED
 
 #include "SkBitmap.h"
 #include "SkRefCnt.h"
 #include "SkString.h"
 #include "SkFlattenable.h"
 #include "SkImageInfo.h"
 #include "SkTDArray.h"
 
@@ skipping 107 matching lines @@
         called), a different generation ID will be returned.
     */
     uint32_t getGenerationID() const;
 
     /** Call this if you have changed the contents of the pixels. This will in-
         turn cause a different generation ID value to be returned from
         getGenerationID().
     */
     void notifyPixelsChanged();
 
+    /**
+     *  Call if the pixels have changed such that they need a new alphaType.
+     *  e.g. Now the pixels are all opaque (or are no longer all opaque).
+     *
+     *  Calling this, if the specified alphatype difference from the current
+     *  type, will automatically invalidate the generationID.
+     */
+    void notifyAlphaTypeChanged(SkAlphaType);
+
     /** Returns true if this pixelref is marked as immutable, meaning that the
         contents of its pixels will not change for the lifetime of the pixelref.
     */
     bool isImmutable() const { return fIsImmutable; }
 
     /** Marks this pixelref is immutable, meaning that the contents of its
         pixels will not change for the lifetime of the pixelref. This state can
         be set on a pixelref, but it cannot be cleared once it is set.
     */
     void setImmutable();
@@ skipping 222 matching lines @@
     /**
      *  Allocate a new pixelref matching the specified ImageInfo, allocating
      *  the memory for the pixels. If the ImageInfo requires a ColorTable,
      *  the pixelref will ref() the colortable.
      *  On failure return NULL.
      */
     virtual SkPixelRef* create(const SkImageInfo&, SkColorTable*) = 0;
 };
 
 #endif