Add toString methods to SkImageFilter-derived classes

src/effects/SkMatrixConvolutionImageFilter.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 "SkMatrixConvolutionImageFilter.h"
 #include "SkBitmap.h"
 #include "SkColorPriv.h"
@@ skipping 351 matching lines @@
                                             fKernelSize,
                                             fKernel,
                                             fGain,
                                             fBias,
                                             fKernelOffset,
                                             convert_tilemodes(fTileMode),
                                             fConvolveAlpha);
     return true;
 }
 #endif
+
+#ifndef SK_IGNORE_TO_STRING
+void SkMatrixConvolutionImageFilter::toString(SkString* str) const {
+    str->appendf("SkMatrixConvolutionImageFilter: (");
+    str->appendf("size: (%d,%d) kernel: (", fKernelSize.width(), fKernelSize.height());
+    for (int y = 0; y < fKernelSize.height(); y++) {
+        for (int x = 0; x < fKernelSize.width(); x++) {
+            str->appendf("%f ", fKernel[y * fKernelSize.width() + x]);
+        }
+    }
+    str->appendf(")");
+    str->appendf("gain: %f bias: %f ", fGain, fBias);
+    str->appendf("offset: (%d, %d) ", fKernelOffset.fX, fKernelOffset.fY);
+    str->appendf("convolveAlpha: %s", fConvolveAlpha ? "true" : "false");
+    str->append(")");
+}
+#endif