FuzzCanvas: only valid ChannelSelectors

BUG=skia:6374
Change-Id: Idf925dbe32298672d7e5debb7e95499269d93706
Reviewed-on: https://skia-review.googlesource.com/9781
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>

diff --git a/fuzz/FuzzCanvas.cpp b/fuzz/FuzzCanvas.cpp
index d59cee0..32ff3ff 100644 (file)
--- a/fuzz/FuzzCanvas.cpp
+++ b/fuzz/FuzzCanvas.cpp
@@ -755,8 +755,8 @@ static sk_sp<SkImageFilter> make_fuzz_imageFilter(Fuzz* fuzz, int depth) {
         }
         case 7: {
             SkDisplacementMapEffect::ChannelSelectorType xChannelSelector, yChannelSelector;
-            fuzz_enum_range(fuzz, &xChannelSelector, 0, 4);
-            fuzz_enum_range(fuzz, &yChannelSelector, 0, 4);
+            fuzz_enum_range(fuzz, &xChannelSelector, 1, 4);
+            fuzz_enum_range(fuzz, &yChannelSelector, 1, 4);
             SkScalar scale;
             bool useCropRect;
             fuzz->next(&scale, &useCropRect);