зеркало из https://github.com/mozilla/gecko-dev.git
126 строки
4.9 KiB
C++
126 строки
4.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* temporary (expanded) representation of property-value pairs used to
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* hold data from matched rules during style data computation.
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*/
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#ifndef nsRuleData_h_
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#define nsRuleData_h_
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#include "nsCSSProps.h"
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#include "nsStyleStructFwd.h"
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class nsPresContext;
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class nsStyleContext;
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struct nsRuleData;
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typedef void (*nsPostResolveFunc)(void* aStyleStruct, nsRuleData* aData);
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struct nsRuleData
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{
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const uint32_t mSIDs;
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bool mCanStoreInRuleTree;
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bool mIsImportantRule;
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uint16_t mLevel; // an nsStyleSet::sheetType
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nsPresContext* const mPresContext;
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nsStyleContext* const mStyleContext;
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// We store nsCSSValues needed to compute the data for one or more
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// style structs (specified by the bitfield mSIDs). These are stored
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// in a single array allocation (which our caller allocates; see
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// AutoCSSValueArray) The offset of each property |prop| in
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// mValueStorage is the sum of
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// mValueOffsets[nsCSSProps::kSIDTable[prop]] and
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// nsCSSProps::PropertyIndexInStruct(prop). The only place we gather
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// more than one style struct's data at a time is
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// nsRuleNode::HasAuthorSpecifiedRules; therefore some code that we
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// know is not called from HasAuthorSpecifiedRules assumes that the
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// mValueOffsets for the one struct in mSIDs is zero.
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nsCSSValue* const mValueStorage; // our user owns this array
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size_t mValueOffsets[nsStyleStructID_Length];
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nsRuleData(uint32_t aSIDs, nsCSSValue* aValueStorage,
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nsPresContext* aContext, nsStyleContext* aStyleContext);
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#ifdef DEBUG
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~nsRuleData();
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#else
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~nsRuleData() {}
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#endif
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/**
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* Return a pointer to the value object within |this| corresponding
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* to property |aProperty|.
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*
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* This function must only be called if the given property is in
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* mSIDs.
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*/
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nsCSSValue* ValueFor(nsCSSProperty aProperty)
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{
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NS_ABORT_IF_FALSE(aProperty < eCSSProperty_COUNT_no_shorthands,
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"invalid or shorthand property");
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nsStyleStructID sid = nsCSSProps::kSIDTable[aProperty];
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size_t indexInStruct = nsCSSProps::PropertyIndexInStruct(aProperty);
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// This should really be nsCachedStyleData::GetBitForSID, but we can't
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// include that here since it includes us.
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NS_ABORT_IF_FALSE(mSIDs & (1 << sid),
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"calling nsRuleData::ValueFor on property not in mSIDs");
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NS_ABORT_IF_FALSE(sid != eStyleStruct_BackendOnly &&
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indexInStruct != size_t(-1),
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"backend-only property");
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return mValueStorage + mValueOffsets[sid] + indexInStruct;
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}
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const nsCSSValue* ValueFor(nsCSSProperty aProperty) const {
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return const_cast<nsRuleData*>(this)->ValueFor(aProperty);
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}
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/**
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* Getters like ValueFor(aProperty), but for each property by name
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* (ValueForBackgroundColor, etc.), and more efficient than ValueFor.
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* These use the names used for the property on DOM interfaces (the
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* 'method' field in nsCSSPropList.h).
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*
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* Like ValueFor(), the caller must check that the property is within
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* mSIDs.
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*/
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#define CSS_PROP_PUBLIC_OR_PRIVATE(publicname_, privatename_) privatename_
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#define CSS_PROP(name_, id_, method_, flags_, pref_, parsevariant_, \
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kwtable_, stylestruct_, stylestructoffset_, animtype_) \
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nsCSSValue* ValueFor##method_() { \
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NS_ABORT_IF_FALSE(mSIDs & NS_STYLE_INHERIT_BIT(stylestruct_), \
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"Calling nsRuleData::ValueFor" #method_ " without " \
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"NS_STYLE_INHERIT_BIT(" #stylestruct_ " in mSIDs."); \
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nsStyleStructID sid = eStyleStruct_##stylestruct_; \
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size_t indexInStruct = \
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nsCSSProps::PropertyIndexInStruct(eCSSProperty_##id_); \
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NS_ABORT_IF_FALSE(sid != eStyleStruct_BackendOnly && \
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indexInStruct != size_t(-1), \
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"backend-only property"); \
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return mValueStorage + mValueOffsets[sid] + indexInStruct; \
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} \
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const nsCSSValue* ValueFor##method_() const { \
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return const_cast<nsRuleData*>(this)->ValueFor##method_(); \
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}
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#define CSS_PROP_BACKENDONLY(name_, id_, method_, flags_, pref_, \
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parsevariant_, kwtable_) \
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/* empty; backend-only structs are not in nsRuleData */
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#include "nsCSSPropList.h"
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#undef CSS_PROP
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#undef CSS_PROP_PUBLIC_OR_PRIVATE
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#undef CSS_PROP_BACKENDONLY
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private:
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inline size_t GetPoisonOffset();
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};
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#endif
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