flag to make kClipToLayer_SaveFlag the default behavior

include/core/SkCanvas.h

 /*
  * Copyright 2006 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 SkCanvas_DEFINED
 #define SkCanvas_DEFINED
 
 #include "SkTypes.h"
 #include "SkBitmap.h"
 #include "SkDeque.h"
 #include "SkClipStack.h"
 #include "SkPaint.h"
 #include "SkRefCnt.h"
 #include "SkPath.h"
 #include "SkRegion.h"
 #include "SkXfermode.h"
 
+// if not defined, we always assume ClipToLayer for saveLayer()
+//#define SK_SUPPORT_LEGACY_CLIPTOLAYERFLAG
+
+
 //#define SK_SUPPORT_LEGACY_WRITEPIXELSCONFIG
 //#define SK_SUPPORT_LEGACY_GETCLIPTYPE
 //#define SK_SUPPORT_LEGACY_GETTOTALCLIP
 
 class SkBounder;
 class SkBaseDevice;
 class SkDraw;
 class SkDrawFilter;
 class SkMetaData;
 class SkPicture;
@@ skipping 287 matching lines @@
 
     enum SaveFlags {
         /** save the matrix state, restoring it on restore() */
         kMatrix_SaveFlag            = 0x01,
         /** save the clip state, restoring it on restore() */
         kClip_SaveFlag              = 0x02,
         /** the layer needs to support per-pixel alpha */
         kHasAlphaLayer_SaveFlag     = 0x04,
         /** the layer needs to support 8-bits per color component */
         kFullColorLayer_SaveFlag    = 0x08,
-        /** the layer should clip against the bounds argument */
+        /**
+         *  the layer should clip against the bounds argument
+         *
+         *  if SK_SUPPORT_LEGACY_CLIPTOLAYERFLAG is undefined, this is treated as always on.
+         */
         kClipToLayer_SaveFlag       = 0x10,
 
         // helper masks for common choices
         kMatrixClip_SaveFlag        = 0x03,
+#ifdef SK_SUPPORT_LEGACY_CLIPTOLAYERFLAG
         kARGB_NoClipLayer_SaveFlag  = 0x0F,
+#endif
         kARGB_ClipLayer_SaveFlag    = 0x1F
     };
 
     /** This call saves the current matrix, clip, and drawFilter, and pushes a
         copy onto a private stack. Subsequent calls to translate, scale,
         rotate, skew, concat or clipRect, clipPath, and setDrawFilter all
         operate on this copy.
         When the balancing call to restore() is made, the previous matrix, clip,
         and drawFilter are restored.
         @param flags The flags govern what portion of the Matrix/Clip/drawFilter
@@ skipping 1069 matching lines @@
     bool asROBitmap(SkBitmap*) const;
 
 private:
     SkBitmap    fBitmap;    // used if peekPixels() fails
     const void* fAddr;      // NULL on failure
     SkImageInfo fInfo;
     size_t      fRowBytes;
 };
 
 #endif