fuzz: signalBug() / signalBoring()

fuzz/FuzzPaeth.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Fuzz.h"
+#include <stdlib.h>
 
 // This really is just an example Fuzz*.cpp file.
 // It tests that two different ways of calculating the Paeth predictor function are equivalent.
 
 static uint8_t paeth_std(uint8_t a, uint8_t b, uint8_t c) {
     int p = a+b-c;
 
     int pa = abs(p-a),
         pb = abs(p-b),
         pc = abs(p-c);
@@ skipping 10 matching lines @@
 
     if (c <= min+delta) return max;
     if (c >= max-delta) return min;
     return c;
 }
 
 DEF_FUZZ(Paeth, fuzz) {
     auto a = fuzz->nextB(),
          b = fuzz->nextB(),
          c = fuzz->nextB();
-    ASSERT(paeth_alt(a,b,c) == paeth_std(a,b,c));
+    SkDebugf("Paeth(%d,%d,%d)\n", a,b,c);
+
+    if (a == b && b == c) {
+        fuzz->signalBoring();  // Not really boring, just demoing signalBoring().
+    }
+
+    if (paeth_alt(a,b,c) != paeth_std(a,b,c)) {
+        fuzz->signalBug();
+    }
 }