Add toString methods to SkImageFilter-derived classes

src/effects/SkMatrixImageFilter.cpp

 /*
  * Copyright 2014 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 "SkMatrixImageFilter.h"
 #include "SkBitmap.h"
 #include "SkCanvas.h"
@@ skipping 106 matching lines @@
     SkRect floatBounds;
     matrix.mapRect(&floatBounds, SkRect::Make(src));
     SkIRect bounds = floatBounds.roundOut();
     if (getInput(0) && !getInput(0)->filterBounds(bounds, ctm, &bounds)) {
         return false;
     }
 
     *dst = bounds;
     return true;
 }
+
+#ifndef SK_IGNORE_TO_STRING
+void SkMatrixImageFilter::toString(SkString* str) const {
+    str->appendf("SkMatrixImageFilter: (");
+
+    str->appendf("transform: (%f %f %f %f %f %f %f %f %f)",
+                 fTransform[SkMatrix::kMScaleX],
+                 fTransform[SkMatrix::kMSkewX],
+                 fTransform[SkMatrix::kMTransX],
+                 fTransform[SkMatrix::kMSkewY],
+                 fTransform[SkMatrix::kMScaleY],
+                 fTransform[SkMatrix::kMTransY],
+                 fTransform[SkMatrix::kMPersp0],
+                 fTransform[SkMatrix::kMPersp1],
+                 fTransform[SkMatrix::kMPersp2]);
+
+    str->append("<dt>FilterLevel:</dt><dd>");
+    static const char* gFilterLevelStrings[] = { "None", "Low", "Medium", "High" };
+    str->append(gFilterLevelStrings[fFilterLevel]);    
+    str->append("</dd>");
+
+    str->appendf(")");
+}
+#endif