remove shadeSpan16 from shader

src/core/SkFilterShader.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 "SkFilterShader.h"
 
 #include "SkColorFilter.h"
@@ skipping 28 matching lines @@
     buffer.writeFlattenable(fShader);
     buffer.writeFlattenable(fFilter);
 }
 
 uint32_t SkFilterShader::FilterShaderContext::getFlags() const {
     const SkFilterShader& filterShader = static_cast<const SkFilterShader&>(fShader);
 
     uint32_t shaderF = fShaderContext->getFlags();
     uint32_t filterF = filterShader.fFilter->getFlags();
 
-    // filters don't support 16bit, so clear the matching bit in the shader
-    shaderF &= ~SkShader::kHasSpan16_Flag;
-
     // if the filter might change alpha, clear the opaque flag in the shader
     if (!(filterF & SkColorFilter::kAlphaUnchanged_Flag)) {
         shaderF &= ~SkShader::kOpaqueAlpha_Flag;
     }
     return shaderF;
 }
 
 SkShader::Context* SkFilterShader::onCreateContext(const ContextRec& rec, void* storage) const {
     char* shaderContextStorage = (char*)storage + sizeof(FilterShaderContext);
     SkShader::Context* shaderContext = fShader->createContext(rec, shaderContextStorage);
@@ skipping 31 matching lines @@
     str->append("Shader: ");
     fShader->toString(str);
     str->append(" Filter: ");
     // TODO: add "fFilter->toString(str);" once SkColorFilter::toString is added
 
     this->INHERITED::toString(str);
 
     str->append(")");
 }
 #endif