Add SkRasterPipeline blitter.

src/core/SkColorFilter.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 "SkColorFilter.h"
 #include "SkReadBuffer.h"
 #include "SkRefCnt.h"
@@ skipping 19 matching lines @@
 bool SkColorFilter::asComponentTable(SkBitmap*) const {
     return false;
 }
 
 #if SK_SUPPORT_GPU
 sk_sp<GrFragmentProcessor> SkColorFilter::asFragmentProcessor(GrContext*) const {
     return nullptr;
 }
 #endif
 
+bool SkColorFilter::appendStages(SkRasterPipeline* pipeline) const {
+    return this->onAppendStages(pipeline);
+}
+
+bool SkColorFilter::onAppendStages(SkRasterPipeline*) const {
+    return false;
+}
+
 void SkColorFilter::filterSpan4f(const SkPM4f src[], int count, SkPM4f result[]) const {
     const int N = 128;
     SkPMColor tmp[N];
     while (count > 0) {
         int n = SkTMin(count, N);
         for (int i = 0; i < n; ++i) {
             tmp[i] = src[i].toPMColor();
         }
         this->filterSpan(tmp, n, tmp);
         for (int i = 0; i < n; ++i) {
@@ skipping 128 matching lines @@
     }
     return sk_sp<SkColorFilter>(new SkComposeColorFilter(std::move(outer), std::move(inner),count));
 }
 
 #include "SkModeColorFilter.h"
 
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkColorFilter)
 SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkComposeColorFilter)
 SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkModeColorFilter)
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END