add asAShadowBlur for android to drawlooper

src/effects/SkLayerDrawLooper.cpp

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SkCanvas.h"
 #include "SkColor.h"
 #include "SkReadBuffer.h"
@@ skipping 135 matching lines @@
                       fCurrRec->fInfo.fOffset.fY);
     } else {
         canvas->translate(fCurrRec->fInfo.fOffset.fX,
                           fCurrRec->fInfo.fOffset.fY);
     }
     fCurrRec = fCurrRec->fNext;
 
     return true;
 }
 
+bool SkLayerDrawLooper::asABlurShadow(BlurShadowRec* bsRec) const {
+    if (fCount != 2) {
+        return false;
+    }
+    const Rec* rec = fRecs;
+
+    // 2nd layer needs to be "plain"
+    if (rec[1].fInfo.fPaintBits) {
+        return false;
+    }
+    if (SkXfermode::kDst_Mode != rec[1].fInfo.fColorMode) {
+        return false;
+    }
+    if (0 != rec[1].fInfo.fOffset.x() || 0 != rec[1].fInfo.fOffset.y()) {
+        return false;
+    }
+
+    // 1st layer needs to be just blur(maskfilter)
+    if ((rec[0].fInfo.fPaintBits & ~kMaskFilter_Bit)) {
+        return false;
+    }
+    if (SkXfermode::kSrc_Mode != rec[0].fInfo.fColorMode) {
+        return false;
+    }
+    const SkMaskFilter* mf = rec[0].fPaint.getMaskFilter();
+    if (NULL == mf) {
+        return false;
+    }
+    SkMaskFilter::BlurRec maskBlur;
+    if (!mf->asABlur(&maskBlur)) {
+        return false;
+    }
+
+    if (bsRec) {
+        bsRec->fSigma = maskBlur.fSigma;
+        bsRec->fOffset = rec[0].fInfo.fOffset;
+        bsRec->fColor = rec[0].fPaint.getColor();
+        bsRec->fStyle = maskBlur.fStyle;
+        bsRec->fQuality = maskBlur.fQuality;
+    }
+    return true;
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 
 void SkLayerDrawLooper::flatten(SkWriteBuffer& buffer) const {
     this->INHERITED::flatten(buffer);
 
 #ifdef SK_DEBUG
     {
         Rec* rec = fRecs;
         int count = 0;
         while (rec) {
@@ skipping 168 matching lines @@
     SkLayerDrawLooper* looper = SkNEW(SkLayerDrawLooper);
     looper->fCount = fCount;
     looper->fRecs = fRecs;
 
     fCount = 0;
     fRecs = NULL;
     fTopRec = NULL;
 
     return looper;
 }