The Tor Browser / file comparison
comparison: dom/smil/SMILIntegerType.cpp
dom/smil/SMILIntegerType.cpp
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
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| -1:000000000000 | 0:552c4cb4d25d |
|---|---|
| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #include "SMILIntegerType.h" | |
| 7 #include "nsSMILValue.h" | |
| 8 #include "nsDebug.h" | |
| 9 #include <math.h> | |
| 10 | |
| 11 namespace mozilla { | |
| 12 | |
| 13 void | |
| 14 SMILIntegerType::Init(nsSMILValue& aValue) const | |
| 15 { | |
| 16 NS_ABORT_IF_FALSE(aValue.IsNull(), "Unexpected value type"); | |
| 17 aValue.mU.mInt = 0; | |
| 18 aValue.mType = this; | |
| 19 } | |
| 20 | |
| 21 void | |
| 22 SMILIntegerType::Destroy(nsSMILValue& aValue) const | |
| 23 { | |
| 24 NS_PRECONDITION(aValue.mType == this, "Unexpected SMIL value"); | |
| 25 aValue.mU.mInt = 0; | |
| 26 aValue.mType = nsSMILNullType::Singleton(); | |
| 27 } | |
| 28 | |
| 29 nsresult | |
| 30 SMILIntegerType::Assign(nsSMILValue& aDest, const nsSMILValue& aSrc) const | |
| 31 { | |
| 32 NS_PRECONDITION(aDest.mType == aSrc.mType, "Incompatible SMIL types"); | |
| 33 NS_PRECONDITION(aDest.mType == this, "Unexpected SMIL value"); | |
| 34 aDest.mU.mInt = aSrc.mU.mInt; | |
| 35 return NS_OK; | |
| 36 } | |
| 37 | |
| 38 bool | |
| 39 SMILIntegerType::IsEqual(const nsSMILValue& aLeft, | |
| 40 const nsSMILValue& aRight) const | |
| 41 { | |
| 42 NS_PRECONDITION(aLeft.mType == aRight.mType, "Incompatible SMIL types"); | |
| 43 NS_PRECONDITION(aLeft.mType == this, "Unexpected type for SMIL value"); | |
| 44 | |
| 45 return aLeft.mU.mInt == aRight.mU.mInt; | |
| 46 } | |
| 47 | |
| 48 nsresult | |
| 49 SMILIntegerType::Add(nsSMILValue& aDest, const nsSMILValue& aValueToAdd, | |
| 50 uint32_t aCount) const | |
| 51 { | |
| 52 NS_PRECONDITION(aValueToAdd.mType == aDest.mType, | |
| 53 "Trying to add invalid types"); | |
| 54 NS_PRECONDITION(aValueToAdd.mType == this, "Unexpected source type"); | |
| 55 aDest.mU.mInt += aValueToAdd.mU.mInt * aCount; | |
| 56 return NS_OK; | |
| 57 } | |
| 58 | |
| 59 nsresult | |
| 60 SMILIntegerType::ComputeDistance(const nsSMILValue& aFrom, | |
| 61 const nsSMILValue& aTo, | |
| 62 double& aDistance) const | |
| 63 { | |
| 64 NS_PRECONDITION(aFrom.mType == aTo.mType,"Trying to compare different types"); | |
| 65 NS_PRECONDITION(aFrom.mType == this, "Unexpected source type"); | |
| 66 aDistance = fabs(double(aTo.mU.mInt - aFrom.mU.mInt)); | |
| 67 return NS_OK; | |
| 68 } | |
| 69 | |
| 70 nsresult | |
| 71 SMILIntegerType::Interpolate(const nsSMILValue& aStartVal, | |
| 72 const nsSMILValue& aEndVal, | |
| 73 double aUnitDistance, | |
| 74 nsSMILValue& aResult) const | |
| 75 { | |
| 76 NS_PRECONDITION(aStartVal.mType == aEndVal.mType, | |
| 77 "Trying to interpolate different types"); | |
| 78 NS_PRECONDITION(aStartVal.mType == this, | |
| 79 "Unexpected types for interpolation"); | |
| 80 NS_PRECONDITION(aResult.mType == this, "Unexpected result type"); | |
| 81 | |
| 82 const double startVal = double(aStartVal.mU.mInt); | |
| 83 const double endVal = double(aEndVal.mU.mInt); | |
| 84 const double currentVal = startVal + (endVal - startVal) * aUnitDistance; | |
| 85 | |
| 86 // When currentVal is exactly midway between its two nearest integers, we | |
| 87 // jump to the "next" integer to provide simple, easy to remember and | |
| 88 // consistent behaviour (from the SMIL author's point of view). | |
| 89 | |
| 90 if (startVal < endVal) { | |
| 91 aResult.mU.mInt = int64_t(floor(currentVal + 0.5)); // round mid up | |
| 92 } else { | |
| 93 aResult.mU.mInt = int64_t(ceil(currentVal - 0.5)); // round mid down | |
| 94 } | |
| 95 | |
| 96 return NS_OK; | |
| 97 } | |
| 98 | |
| 99 } // namespace mozilla |
