simplify handle-affine: subclass overrides just describe their leaf behavior

src/core/SkImageFilter.cpp

 /*
  * Copyright 2012 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 "SkImageFilter.h"
 #include "SkImageFilterCacheKey.h"
 
@@ skipping 312 matching lines @@
     if (!this->isColorFilterNode(filterPtr)) {
         return false;
     }
     if (nullptr != this->getInput(0) || (*filterPtr)->affectsTransparentBlack()) {
         (*filterPtr)->unref();
         return false;
     }
     return true;
 }
 
-bool SkImageFilter::onCanHandleAffine() const {
-    bool hasInputs = false;
-
+bool SkImageFilter::canHandleComplexCTM() const {
+    if (!this->onCanHandleComplexCTM()) {
+        return false;
+    }
     const int count = this->countInputs();
     for (int i = 0; i < count; ++i) {
         SkImageFilter* input = this->getInput(i);
-        if (input) {
-            if (!input->canHandleAffine()) {
-                return false;
-            }
-            hasInputs = true;
+        if (input && !input->canHandleComplexCTM()) {
+            return false;
         }
     }
-    // We return true iff we had 1 or more inputs, and all of them can handle affine.
-    // If we have no inputs, or 1 or more of them do not handle affine, then we return false.
-    return hasInputs;
+    return true;
 }
 
 bool SkImageFilter::applyCropRect(const Context& ctx, const SkIRect& srcBounds,
                                   SkIRect* dstBounds) const {
     SkIRect temp = this->onFilterNodeBounds(srcBounds, ctx.ctm(), kForward_MapDirection);
     fCropRect.applyTo(temp, ctx.ctm(), this->affectsTransparentBlack(), dstBounds);
     // Intersect against the clip bounds, in case the crop rect has
     // grown the bounds beyond the original clip. This can happen for
     // example in tiling, where the clip is much smaller than the filtered
     // primitive. If we didn't do this, we would be processing the filter
@@ skipping 213 matching lines @@
 
 SK_DECLARE_STATIC_ONCE_PTR(SkImageFilter::Cache, cache);
 SkImageFilter::Cache* SkImageFilter::Cache::Get() {
     return cache.get([]{ return SkImageFilter::Cache::Create(kDefaultCacheSize); });
 }
 
 void SkImageFilter::PurgeCache() {
     Cache::Get()->purge();
 }