Handle large rects better.

base/numerics/saturated_arithmetic.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_NUMERICS_SATURATED_ARITHMETIC_H_
 #define BASE_NUMERICS_SATURATED_ARITHMETIC_H_
 
 #include <stdint.h>
 
 #include <limits>
@@ skipping 38 matching lines @@
 
   return result;
 }
 
 ALWAYS_INLINE int32_t SaturatedNegative(int32_t a) {
   if (UNLIKELY(a == std::numeric_limits<int>::min()))
     return std::numeric_limits<int>::max();
   return -a;
 }
 
+ALWAYS_INLINE int32_t SaturatedAbsolute(int32_t a) {
+  if (a >= 0)
+    return a;
+  if (UNLIKELY(a == std::numeric_limits<int>::min()))
+    return std::numeric_limits<int>::max();
+  return -a;
+}
+
 ALWAYS_INLINE int GetMaxSaturatedSetResultForTesting(int fractional_shift) {
   // For C version the set function maxes out to max int, this differs from
   // the ARM asm version, see saturated_arithmetic_arm.h for the equivalent asm
   // version.
   return std::numeric_limits<int>::max();
 }
 
 ALWAYS_INLINE int GetMinSaturatedSetResultForTesting(int fractional_shift) {
   return std::numeric_limits<int>::min();
 }
@@ skipping 23 matching lines @@
   if (value >= kIntMaxForLayoutUnit)
     return std::numeric_limits<int>::max();
 
   return value << fractional_shift;
 }
 
 }  // namespace base
 
 #endif  // CPU(ARM) && COMPILER(GCC)
 #endif  // BASE_NUMERICS_SATURATED_ARITHMETIC_H_