add asAShadowBlur for android to drawlooper

src/core/SkMaskFilter.cpp

 
 /*
  * 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.
  */
 
 
 #include "SkMaskFilter.h"
 #include "SkBlitter.h"
 #include "SkBounder.h"
 #include "SkDraw.h"
 #include "SkRasterClip.h"
 #include "SkRRect.h"
 #include "SkTypes.h"
 
 #if SK_SUPPORT_GPU
 #include "GrTexture.h"
 #include "SkGr.h"
 #include "SkGrPixelRef.h"
 #endif
 
 bool SkMaskFilter::filterMask(SkMask*, const SkMask&, const SkMatrix&,
                               SkIPoint*) const {
     return false;
 }
 
+bool SkMaskFilter::asABlur(BlurRec*) const {
+    return false;
+}
+
 static void extractMaskSubset(const SkMask& src, SkMask* dst) {
     SkASSERT(src.fBounds.contains(dst->fBounds));
 
     const int dx = dst->fBounds.left() - src.fBounds.left();
     const int dy = dst->fBounds.top() - src.fBounds.top();
     dst->fImage = src.fImage + dy * src.fRowBytes + dx;
     dst->fRowBytes = src.fRowBytes;
     dst->fFormat = src.fFormat;
 }
 
@@ skipping 302 matching lines @@
     srcM.fRowBytes = 0;
     srcM.fFormat = SkMask::kA8_Format;
 
     SkIPoint margin;    // ignored
     if (this->filterMask(&dstM, srcM, SkMatrix::I(), &margin)) {
         dst->set(dstM.fBounds);
     } else {
         dst->set(srcM.fBounds);
     }
 }