fix bug with awesome filtered images sometimes being slightly offset.

src/core/SkBitmapFilter.h

 
 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkBitmapFilter_DEFINED
 #define SkBitmapFilter_DEFINED
 
 #include "SkMath.h"
 
 // size of the precomputed bitmap filter tables for high quality filtering.
 // Used to precompute the shape of the filter kernel.
 // Table size chosen from experiments to see where I could start to see a difference.
 
-#define SKBITMAP_FILTER_TABLE_SIZE 32
+#define SKBITMAP_FILTER_TABLE_SIZE 128
 
 class SkBitmapFilter {
   public:
       SkBitmapFilter(float width)
       : fWidth(width), fInvWidth(1.f/width) {
           precomputed = false;
       }
 
       SkFixed lookup( float x ) const {
           if (!precomputed) {
@@ skipping 111 matching lines @@
           float sinc = sk_float_sin(x) / x;
           float lanczos = sk_float_sin(x * tau) / (x * tau);
           return sinc * lanczos;
       }
   protected:
       float tau;
 };
 
 
 #endif