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Diffstat (limited to 'dom/svg/SVGTransform.cpp')
| -rw-r--r-- | dom/svg/SVGTransform.cpp | 371 |
1 files changed, 371 insertions, 0 deletions
diff --git a/dom/svg/SVGTransform.cpp b/dom/svg/SVGTransform.cpp new file mode 100644 index 000000000..b73018d1c --- /dev/null +++ b/dom/svg/SVGTransform.cpp @@ -0,0 +1,371 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "SVGTransform.h" + +#include "mozilla/dom/SVGTransform.h" +#include "mozilla/dom/SVGMatrix.h" +#include "mozilla/dom/SVGTransformBinding.h" +#include "nsError.h" +#include "nsSVGAnimatedTransformList.h" +#include "nsSVGAttrTearoffTable.h" +#include "mozilla/DebugOnly.h" +#include "mozilla/FloatingPoint.h" + +namespace { + const double kRadPerDegree = 2.0 * M_PI / 360.0; +} // namespace + +namespace mozilla { +namespace dom { + +static nsSVGAttrTearoffTable<SVGTransform, SVGMatrix>& +SVGMatrixTearoffTable() +{ + static nsSVGAttrTearoffTable<SVGTransform, SVGMatrix> sSVGMatrixTearoffTable; + return sSVGMatrixTearoffTable; +} + +//---------------------------------------------------------------------- + +// We could use NS_IMPL_CYCLE_COLLECTION(, except that in Unlink() we need to +// clear our list's weak ref to us to be safe. (The other option would be to +// not unlink and rely on the breaking of the other edges in the cycle, as +// NS_SVG_VAL_IMPL_CYCLE_COLLECTION does.) +NS_IMPL_CYCLE_COLLECTION_CLASS(SVGTransform) + +NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(SVGTransform) + // We may not belong to a list, so we must null check tmp->mList. + if (tmp->mList) { + tmp->mList->mItems[tmp->mListIndex] = nullptr; + } +NS_IMPL_CYCLE_COLLECTION_UNLINK(mList) +NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER +NS_IMPL_CYCLE_COLLECTION_UNLINK_END + +NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(SVGTransform) +NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mList) + SVGMatrix* matrix = + SVGMatrixTearoffTable().GetTearoff(tmp); + CycleCollectionNoteChild(cb, matrix, "matrix"); +NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS +NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END + +NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(SVGTransform) +NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER +NS_IMPL_CYCLE_COLLECTION_TRACE_END + +NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(SVGTransform, AddRef) +NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(SVGTransform, Release) + +JSObject* +SVGTransform::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) +{ + return SVGTransformBinding::Wrap(aCx, this, aGivenProto); +} + +//---------------------------------------------------------------------- +// Helper class: AutoChangeTransformNotifier +// Stack-based helper class to pair calls to WillChangeTransformList +// and DidChangeTransformList. +class MOZ_RAII AutoChangeTransformNotifier +{ +public: + explicit AutoChangeTransformNotifier(SVGTransform* aTransform MOZ_GUARD_OBJECT_NOTIFIER_PARAM) + : mTransform(aTransform) + { + MOZ_GUARD_OBJECT_NOTIFIER_INIT; + MOZ_ASSERT(mTransform, "Expecting non-null transform"); + if (mTransform->HasOwner()) { + mEmptyOrOldValue = + mTransform->Element()->WillChangeTransformList(); + } + } + + ~AutoChangeTransformNotifier() + { + if (mTransform->HasOwner()) { + mTransform->Element()->DidChangeTransformList(mEmptyOrOldValue); + if (mTransform->mList->IsAnimating()) { + mTransform->Element()->AnimationNeedsResample(); + } + } + } + +private: + SVGTransform* const mTransform; + nsAttrValue mEmptyOrOldValue; + MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER +}; + +//---------------------------------------------------------------------- +// Ctors: + +SVGTransform::SVGTransform(DOMSVGTransformList *aList, + uint32_t aListIndex, + bool aIsAnimValItem) + : mList(aList) + , mListIndex(aListIndex) + , mIsAnimValItem(aIsAnimValItem) + , mTransform(nullptr) +{ + // These shifts are in sync with the members in the header. + MOZ_ASSERT(aList && aListIndex <= MaxListIndex(), "bad arg"); + + MOZ_ASSERT(IndexIsValid(), "Bad index for DOMSVGNumber!"); +} + +SVGTransform::SVGTransform() + : mList(nullptr) + , mListIndex(0) + , mIsAnimValItem(false) + , mTransform(new nsSVGTransform()) // Default ctor for objects not in a list + // initialises to matrix type with identity + // matrix +{ +} + +SVGTransform::SVGTransform(const gfxMatrix &aMatrix) + : mList(nullptr) + , mListIndex(0) + , mIsAnimValItem(false) + , mTransform(new nsSVGTransform(aMatrix)) +{ +} + +SVGTransform::SVGTransform(const nsSVGTransform &aTransform) + : mList(nullptr) + , mListIndex(0) + , mIsAnimValItem(false) + , mTransform(new nsSVGTransform(aTransform)) +{ +} + +SVGTransform::~SVGTransform() +{ + SVGMatrix* matrix = SVGMatrixTearoffTable().GetTearoff(this); + if (matrix) { + SVGMatrixTearoffTable().RemoveTearoff(this); + NS_RELEASE(matrix); + } + // Our mList's weak ref to us must be nulled out when we die. If GC has + // unlinked us using the cycle collector code, then that has already + // happened, and mList is null. + if (mList) { + mList->mItems[mListIndex] = nullptr; + } +} + +uint16_t +SVGTransform::Type() const +{ + return Transform().Type(); +} + +SVGMatrix* +SVGTransform::GetMatrix() +{ + SVGMatrix* wrapper = + SVGMatrixTearoffTable().GetTearoff(this); + if (!wrapper) { + NS_ADDREF(wrapper = new SVGMatrix(*this)); + SVGMatrixTearoffTable().AddTearoff(this, wrapper); + } + return wrapper; +} + +float +SVGTransform::Angle() const +{ + return Transform().Angle(); +} + +void +SVGTransform::SetMatrix(SVGMatrix& aMatrix, ErrorResult& rv) +{ + if (mIsAnimValItem) { + rv.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR); + return; + } + SetMatrix(aMatrix.GetMatrix()); +} + +void +SVGTransform::SetTranslate(float tx, float ty, ErrorResult& rv) +{ + if (mIsAnimValItem) { + rv.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR); + return; + } + + if (Transform().Type() == SVG_TRANSFORM_TRANSLATE && + Matrixgfx()._31 == tx && Matrixgfx()._32 == ty) { + return; + } + + AutoChangeTransformNotifier notifier(this); + Transform().SetTranslate(tx, ty); +} + +void +SVGTransform::SetScale(float sx, float sy, ErrorResult& rv) +{ + if (mIsAnimValItem) { + rv.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR); + return; + } + + if (Transform().Type() == SVG_TRANSFORM_SCALE && + Matrixgfx()._11 == sx && Matrixgfx()._22 == sy) { + return; + } + AutoChangeTransformNotifier notifier(this); + Transform().SetScale(sx, sy); +} + +void +SVGTransform::SetRotate(float angle, float cx, float cy, ErrorResult& rv) +{ + if (mIsAnimValItem) { + rv.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR); + return; + } + + if (Transform().Type() == SVG_TRANSFORM_ROTATE) { + float currentCx, currentCy; + Transform().GetRotationOrigin(currentCx, currentCy); + if (Transform().Angle() == angle && currentCx == cx && currentCy == cy) { + return; + } + } + + AutoChangeTransformNotifier notifier(this); + Transform().SetRotate(angle, cx, cy); +} + +void +SVGTransform::SetSkewX(float angle, ErrorResult& rv) +{ + if (mIsAnimValItem) { + rv.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR); + return; + } + + if (Transform().Type() == SVG_TRANSFORM_SKEWX && + Transform().Angle() == angle) { + return; + } + + if (!IsFinite(tan(angle * kRadPerDegree))) { + rv.ThrowRangeError<MSG_INVALID_TRANSFORM_ANGLE_ERROR>(); + return; + } + + AutoChangeTransformNotifier notifier(this); + DebugOnly<nsresult> result = Transform().SetSkewX(angle); + MOZ_ASSERT(NS_SUCCEEDED(result), "SetSkewX unexpectedly failed"); +} + +void +SVGTransform::SetSkewY(float angle, ErrorResult& rv) +{ + if (mIsAnimValItem) { + rv.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR); + return; + } + + if (Transform().Type() == SVG_TRANSFORM_SKEWY && + Transform().Angle() == angle) { + return; + } + + if (!IsFinite(tan(angle * kRadPerDegree))) { + rv.ThrowRangeError<MSG_INVALID_TRANSFORM_ANGLE_ERROR>(); + return; + } + + AutoChangeTransformNotifier notifier(this); + DebugOnly<nsresult> result = Transform().SetSkewY(angle); + MOZ_ASSERT(NS_SUCCEEDED(result), "SetSkewY unexpectedly failed"); +} + +//---------------------------------------------------------------------- +// List management methods: + +void +SVGTransform::InsertingIntoList(DOMSVGTransformList *aList, + uint32_t aListIndex, + bool aIsAnimValItem) +{ + MOZ_ASSERT(!HasOwner(), "Inserting item that is already in a list"); + + mList = aList; + mListIndex = aListIndex; + mIsAnimValItem = aIsAnimValItem; + mTransform = nullptr; + + MOZ_ASSERT(IndexIsValid(), "Bad index for DOMSVGLength!"); +} + +void +SVGTransform::RemovingFromList() +{ + MOZ_ASSERT(!mTransform, + "Item in list also has another non-list value associated with it"); + + mTransform = new nsSVGTransform(InternalItem()); + mList = nullptr; + mIsAnimValItem = false; +} + +nsSVGTransform& +SVGTransform::InternalItem() +{ + nsSVGAnimatedTransformList *alist = Element()->GetAnimatedTransformList(); + return mIsAnimValItem && alist->mAnimVal ? + (*alist->mAnimVal)[mListIndex] : + alist->mBaseVal[mListIndex]; +} + +const nsSVGTransform& +SVGTransform::InternalItem() const +{ + return const_cast<SVGTransform*>(this)->InternalItem(); +} + +#ifdef DEBUG +bool +SVGTransform::IndexIsValid() +{ + nsSVGAnimatedTransformList *alist = Element()->GetAnimatedTransformList(); + return (mIsAnimValItem && + mListIndex < alist->GetAnimValue().Length()) || + (!mIsAnimValItem && + mListIndex < alist->GetBaseValue().Length()); +} +#endif // DEBUG + + +//---------------------------------------------------------------------- +// Interface for SVGMatrix's use + +void +SVGTransform::SetMatrix(const gfxMatrix& aMatrix) +{ + MOZ_ASSERT(!mIsAnimValItem, + "Attempting to modify read-only transform"); + + if (Transform().Type() == SVG_TRANSFORM_MATRIX && + nsSVGTransform::MatricesEqual(Matrixgfx(), aMatrix)) { + return; + } + + AutoChangeTransformNotifier notifier(this); + Transform().SetMatrix(aMatrix); +} + +} // namespace dom +} // namespace mozilla |