dom/smil/SMILTimeValue.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "SMILTimeValue.h"
   8 #include "nsMathUtils.h"
   9
  10 namespace mozilla {
  11
  12 const SMILTime SMILTimeValue::kUnresolvedMillis =
  13     std::numeric_limits<SMILTime>::max();
  14
  15 //----------------------------------------------------------------------
  16 // SMILTimeValue methods:
  17
  18 static inline int8_t Cmp(int64_t aA, int64_t aB) {
  19   return aA == aB ? 0 : (aA > aB ? 1 : -1);
  20 }
  21
  22 int8_t SMILTimeValue::CompareTo(const SMILTimeValue& aOther) const {
  23   int8_t result;
  24
  25   if (mState == STATE_DEFINITE) {
  26     result = (aOther.mState == STATE_DEFINITE)
  27                  ? Cmp(mMilliseconds, aOther.mMilliseconds)
  28                  : -1;
  29   } else if (mState == STATE_INDEFINITE) {
  30     if (aOther.mState == STATE_DEFINITE)
  31       result = 1;
  32     else if (aOther.mState == STATE_INDEFINITE)
  33       result = 0;
  34     else
  35       result = -1;
  36   } else {
  37     result = (aOther.mState != STATE_UNRESOLVED) ? 1 : 0;
  38   }
  39
  40   return result;
  41 }
  42
  43 void SMILTimeValue::SetMillis(double aMillis, Rounding aRounding) {
  44   mState = STATE_DEFINITE;
  45   mMilliseconds = NS_round(aMillis);
  46   if (aRounding == Rounding::EnsureNonZero && !mMilliseconds && aMillis) {
  47     // Ensure we don't round small values to zero.
  48     mMilliseconds = std::copysign(1.0, aMillis);
  49   }
  50 }
  51
  52 }  // namespace mozilla