Add toString methods to SkImageFilter-derived classes

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 "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
@@ skipping 263 matching lines @@
     ctm.mapVectors(&scale, 1);
     bounds.outset(SkScalarCeilToInt(scale.fX * SK_ScalarHalf),
                   SkScalarCeilToInt(scale.fY * SK_ScalarHalf));
     if (getColorInput()) {
         return getColorInput()->filterBounds(bounds, ctm, dst);
     }
     *dst = bounds;
     return true;
 }
 
+#ifndef SK_IGNORE_TO_STRING
+void SkDisplacementMapEffect::toString(SkString* str) const {
+    str->appendf("SkDisplacementMapEffect: (");
+    str->appendf("scale: %f ", fScale);
+    str->appendf("displacement: (");
+    if (this->getDisplacementInput()) {
+        this->getDisplacementInput()->toString(str);
+    }
+    str->appendf(") color: (");
+    if (this->getColorInput()) {
+        this->getColorInput()->toString(str);
+    }
+    str->appendf("))");
+}
+#endif
+
 ///////////////////////////////////////////////////////////////////////////////
 
 #if SK_SUPPORT_GPU
 class GrGLDisplacementMapEffect : public GrGLFragmentProcessor {
 public:
     GrGLDisplacementMapEffect(const GrProcessor&);
     virtual ~GrGLDisplacementMapEffect();
 
     virtual void emitCode(GrGLFPBuilder*,
                           const GrFragmentProcessor&,
@@ skipping 319 matching lines @@
 void GrGLDisplacementMapEffect::GenKey(const GrProcessor& proc,
                                        const GrGLCaps&, GrProcessorKeyBuilder* b) {
     const GrDisplacementMapEffect& displacementMap = proc.cast<GrDisplacementMapEffect>();
 
     uint32_t xKey = displacementMap.xChannelSelector();
     uint32_t yKey = displacementMap.yChannelSelector() << kChannelSelectorKeyBits;
 
     b->add32(xKey | yKey);
 }
 #endif
+