1 files changed, 15 insertions, 0 deletions
diff --git a/src/effects/SkMatrixConvolutionImageFilter.cpp b/src/effects/SkMatrixConvolutionImageFilter.cpp
index 7668a02849..848676afaf 100644
--- a/src/effects/SkMatrixConvolutionImageFilter.cpp
+++ b/src/effects/SkMatrixConvolutionImageFilter.cpp
@@ -479,3 +479,18 @@ bool SkMatrixConvolutionImageFilter::affectsTransparentBlack() const {
     // pixels it will affect in object-space.
     return kRepeat_TileMode != fTileMode;
 }
+
+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(")");
+}