Revert of Have GrRectBlurEffect use Linear filtering (rather than Nearest Neighbor)

src/effects/SkBlurMaskFilter.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 "SkBlurMaskFilter.h"
 #include "SkBlurMask.h"
@@ skipping 659 matching lines @@
 };
 
 void OutputRectBlurProfileLookup(GrGLFragmentBuilder* fsBuilder,
                                  const GrGLShaderBuilder::TextureSampler& sampler,
                                  const char *output,
                                  const char *profileSize, const char *loc,
                                  const char *blurred_width,
                                  const char *sharp_width) {
     fsBuilder->codeAppendf("\tfloat %s;\n", output);
     fsBuilder->codeAppendf("\t\t{\n");
-    fsBuilder->codeAppendf("\t\t\tfloat coord = (0.5 * (abs(2.0*%s - %s) - %s) + 0.5)/%s;\n",
+    fsBuilder->codeAppendf("\t\t\tfloat coord = (0.5 * (abs(2.0*%s - %s) - %s))/%s;\n",
                            loc, blurred_width, sharp_width, profileSize);
     fsBuilder->codeAppendf("\t\t\t%s = ", output);
     fsBuilder->appendTextureLookup(sampler, "vec2(coord,0.5)");
     fsBuilder->codeAppend(".a;\n");
     fsBuilder->codeAppendf("\t\t}\n");
 }
 
 void GrGLRectBlurEffect::emitCode(EmitArgs& args) {
 
     const char *rectName;
@@ skipping 71 matching lines @@
             textureProvider->assignUniqueKeyToTexture(key, blurProfile);
         }
     }
 
     return blurProfile;
 }
 
 GrRectBlurEffect::GrRectBlurEffect(const SkRect& rect, float sigma, GrTexture *blurProfile)
     : fRect(rect)
     , fSigma(sigma)
-    , fBlurProfileAccess(blurProfile, GrTextureParams::kBilerp_FilterMode) {
+    , fBlurProfileAccess(blurProfile) {
     this->initClassID<GrRectBlurEffect>();
     this->addTextureAccess(&fBlurProfileAccess);
     this->setWillReadFragmentPosition();
 }
 
 void GrRectBlurEffect::onGetGLProcessorKey(const GrGLSLCaps& caps,
                                          GrProcessorKeyBuilder* b) const {
     GrGLRectBlurEffect::GenKey(*this, caps, b);
 }
 
@@ skipping 480 matching lines @@
     } else {
         str->append("None");
     }
     str->append("))");
 }
 #endif
 
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkBlurMaskFilter)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkBlurMaskFilterImpl)
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END