ios fixes

src/core/SkMathPriv.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkMathPriv_DEFINED
 #define SkMathPriv_DEFINED
 
 #include "SkMath.h"
 
+#if SK_BUILD_FOR_IOS
+#define SK_FAST_UNDERFLOW_BEHAVIOR
+#endif
+
 /** Returns -1 if n < 0, else returns 0
  */
 #define SkExtractSign(n)    ((int32_t)(n) >> 31)
 
 /** If sign == -1, returns -n, else sign must be 0, and returns n.
  Typically used in conjunction with SkExtractSign().
  */
 static inline int32_t SkApplySign(int32_t n, int32_t sign) {
     SkASSERT(sign == 0 || sign == -1);
     return (n ^ sign) - sign;
@@ skipping 39 matching lines @@
 }
 
 /** Just the rounding step in SkDiv255Round: round(value / 255)
  */
 static inline unsigned SkDiv255Round(unsigned prod) {
     prod += 128;
     return (prod + (prod >> 8)) >> 8;
 }
 
 #endif