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

src/effects/SkDisplacementMapEffect.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 "SkDisplacementMapEffect.h"
 
 #include "SkBitmap.h"
@@ skipping 170 matching lines @@
 }
 
 SkDisplacementMapEffect::SkDisplacementMapEffect(ChannelSelectorType xChannelSelector,
                                                  ChannelSelectorType yChannelSelector,
                                                  SkScalar scale,
                                                  sk_sp<SkImageFilter> inputs[2],
                                                  const CropRect* cropRect)
     : INHERITED(inputs, 2, cropRect)
     , fXChannelSelector(xChannelSelector)
     , fYChannelSelector(yChannelSelector)
-    , fScale(scale) {
+    , fScale(SkScalarNormalize(scale)) {
 }
 
 SkDisplacementMapEffect::~SkDisplacementMapEffect() {
 }
 
 sk_sp<SkFlattenable> SkDisplacementMapEffect::CreateProc(SkReadBuffer& buffer) {
     SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 2);
     ChannelSelectorType xsel = (ChannelSelectorType)buffer.readInt();
     ChannelSelectorType ysel = (ChannelSelectorType)buffer.readInt();
     SkScalar scale = buffer.readScalar();
@@ skipping 416 matching lines @@
 void GrGLDisplacementMapEffect::GenKey(const GrProcessor& proc,
                                        const GrGLSLCaps&, GrProcessorKeyBuilder* b) {
     const GrDisplacementMapEffect& displacementMap = proc.cast<GrDisplacementMapEffect>();
 
     uint32_t xKey = displacementMap.xChannelSelector();
     uint32_t yKey = displacementMap.yChannelSelector() << kChannelSelectorKeyBits;
 
     b->add32(xKey | yKey);
 }
 #endif