Image filters: force near-zero floating point parameters to zero.

src/effects/SkPerlinNoiseShader.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkPerlinNoiseShader.h"
 #include "SkColorFilter.h"
 #include "SkReadBuffer.h"
@@ skipping 68 matching lines @@
     PaintingData(const SkISize& tileSize, SkScalar seed,
                  SkScalar baseFrequencyX, SkScalar baseFrequencyY,
                  const SkMatrix& matrix)
     {
         SkVector vec[2] = {
             { SkScalarInvert(baseFrequencyX),   SkScalarInvert(baseFrequencyY)  },
             { SkIntToScalar(tileSize.fWidth),   SkIntToScalar(tileSize.fHeight) },
         };
         matrix.mapVectors(vec, 2);
 
-        fBaseFrequency.set(SkScalarInvert(vec[0].fX), SkScalarInvert(vec[0].fY));
+        fBaseFrequency.set(SkScalarNormalize(SkScalarInvert(vec[0].fX)), SkScalarNormalize(SkScalarInvert(vec[0].fY)));
         fTileSize.set(SkScalarRoundToInt(vec[1].fX), SkScalarRoundToInt(vec[1].fY));
         this->init(seed);
         if (!fTileSize.isEmpty()) {
             this->stitch();
         }
 
 #if SK_SUPPORT_GPU
         fPermutationsBitmap.setInfo(SkImageInfo::MakeA8(kBlockSize, 1));
         fPermutationsBitmap.setPixels(fLatticeSelector);
 
@@ skipping 873 matching lines @@
     str->append(" seed: ");
     str->appendScalar(fSeed);
     str->append(" stitch tiles: ");
     str->append(fStitchTiles ? "true " : "false ");
 
     this->INHERITED::toString(str);
 
     str->append(")");
 }
 #endif