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gecko/layout/style/nsRuleNode.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Original Author: David W. Hyatt (hyatt@netscape.com)
* L. David Baron <dbaron@dbaron.org>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/*
* a node in the lexicographic tree of rules that match an element,
* responsible for converting the rules' information into computed style
*/
#ifndef nsRuleNode_h___
#define nsRuleNode_h___
#include "nsPresContext.h"
#include "nsStyleStruct.h"
class nsStyleContext;
struct PLDHashTable;
class nsILanguageAtomService;
struct nsRuleData;
class nsIStyleRule;
struct nsCSSStruct;
struct nsCSSValueList;
// Copy of typedef that's in nsCSSStruct.h, for compilation speed.
typedef nsCSSStruct nsRuleDataStruct;
struct nsRuleDataFont;
class nsCSSValue;
struct nsCSSRect;
struct nsInheritedStyleData
{
#define STYLE_STRUCT_INHERITED(name, checkdata_cb, ctor_args) \
nsStyle##name * m##name##Data;
#define STYLE_STRUCT_RESET(name, checkdata_cb, ctor_args)
#include "nsStyleStructList.h"
#undef STYLE_STRUCT_INHERITED
#undef STYLE_STRUCT_RESET
void* operator new(size_t sz, nsPresContext* aContext) CPP_THROW_NEW {
return aContext->AllocateFromShell(sz);
}
void DestroyStructs(PRUint32 aBits, nsPresContext* aContext) {
#define STYLE_STRUCT_INHERITED(name, checkdata_cb, ctor_args) \
if (m##name##Data && !(aBits & NS_STYLE_INHERIT_BIT(name))) \
m##name##Data->Destroy(aContext);
#define STYLE_STRUCT_RESET(name, checkdata_cb, ctor_args)
#include "nsStyleStructList.h"
#undef STYLE_STRUCT_INHERITED
#undef STYLE_STRUCT_RESET
}
void Destroy(PRUint32 aBits, nsPresContext* aContext) {
DestroyStructs(aBits, aContext);
aContext->FreeToShell(sizeof(nsInheritedStyleData), this);
}
nsInheritedStyleData() {
#define STYLE_STRUCT_INHERITED(name, checkdata_cb, ctor_args) \
m##name##Data = nsnull;
#define STYLE_STRUCT_RESET(name, checkdata_cb, ctor_args)
#include "nsStyleStructList.h"
#undef STYLE_STRUCT_INHERITED
#undef STYLE_STRUCT_RESET
}
};
struct nsResetStyleData
{
nsResetStyleData()
{
#define STYLE_STRUCT_RESET(name, checkdata_cb, ctor_args) \
m##name##Data = nsnull;
#define STYLE_STRUCT_INHERITED(name, checkdata_cb, ctor_args)
#include "nsStyleStructList.h"
#undef STYLE_STRUCT_RESET
#undef STYLE_STRUCT_INHERITED
}
void* operator new(size_t sz, nsPresContext* aContext) CPP_THROW_NEW {
return aContext->AllocateFromShell(sz);
}
void Destroy(PRUint32 aBits, nsPresContext* aContext) {
#define STYLE_STRUCT_RESET(name, checkdata_cb, ctor_args) \
if (m##name##Data && !(aBits & NS_STYLE_INHERIT_BIT(name))) \
m##name##Data->Destroy(aContext);
#define STYLE_STRUCT_INHERITED(name, checkdata_cb, ctor_args)
#include "nsStyleStructList.h"
#undef STYLE_STRUCT_RESET
#undef STYLE_STRUCT_INHERITED
aContext->FreeToShell(sizeof(nsResetStyleData), this);
}
#define STYLE_STRUCT_RESET(name, checkdata_cb, ctor_args) \
nsStyle##name * m##name##Data;
#define STYLE_STRUCT_INHERITED(name, checkdata_cb, ctor_args)
#include "nsStyleStructList.h"
#undef STYLE_STRUCT_RESET
#undef STYLE_STRUCT_INHERITED
};
struct nsCachedStyleData
{
struct StyleStructInfo {
ptrdiff_t mCachedStyleDataOffset;
ptrdiff_t mInheritResetOffset;
PRBool mIsReset;
};
static StyleStructInfo gInfo[];
nsInheritedStyleData* mInheritedData;
nsResetStyleData* mResetData;
static PRBool IsReset(const nsStyleStructID& aSID) {
return gInfo[aSID].mIsReset;
}
static PRUint32 GetBitForSID(const nsStyleStructID& aSID) {
return 1 << aSID;
}
void* NS_FASTCALL GetStyleData(const nsStyleStructID& aSID) {
// Each struct is stored at this.m##type##Data->m##name##Data where
// |type| is either Inherit or Reset, and |name| is the name of the
// style struct. The |gInfo| stores the offset of the appropriate
// m##type##Data for the struct within nsCachedStyleData (|this|)
// and the offset of the appropriate m##name##Data within the
// m##type##Data. Note that if we don't have any reset structs,
// then mResetData is null, and likewise for mInheritedData. This
// saves us from having to go through the long if-else cascade into
// which most compilers will turn a case statement.
// NOTE: nsStyleContext::SetStyle works roughly the same way.
const StyleStructInfo& info = gInfo[aSID];
// Get either &mInheritedData or &mResetData.
char* resetOrInheritSlot = reinterpret_cast<char*>(this) + info.mCachedStyleDataOffset;
// Get either mInheritedData or mResetData.
char* resetOrInherit = reinterpret_cast<char*>(*reinterpret_cast<void**>(resetOrInheritSlot));
void* data = nsnull;
if (resetOrInherit) {
// If we have the mInheritedData or mResetData, then we might have
// the struct, so get it.
char* dataSlot = resetOrInherit + info.mInheritResetOffset;
data = *reinterpret_cast<void**>(dataSlot);
}
return data;
}
// Typesafe and faster versions of the above
#define STYLE_STRUCT_INHERITED(name_, checkdata_cb_, ctor_args_) \
nsStyle##name_ * NS_FASTCALL GetStyle##name_ () { \
return mInheritedData ? mInheritedData->m##name_##Data : nsnull; \
}
#define STYLE_STRUCT_RESET(name_, checkdata_cb_, ctor_args_) \
nsStyle##name_ * NS_FASTCALL GetStyle##name_ () { \
return mResetData ? mResetData->m##name_##Data : nsnull; \
}
#include "nsStyleStructList.h"
#undef STYLE_STRUCT_RESET
#undef STYLE_STRUCT_INHERITED
void Destroy(PRUint32 aBits, nsPresContext* aContext) {
if (mResetData)
mResetData->Destroy(aBits, aContext);
if (mInheritedData)
mInheritedData->Destroy(aBits, aContext);
mResetData = nsnull;
mInheritedData = nsnull;
}
nsCachedStyleData() :mInheritedData(nsnull), mResetData(nsnull) {}
~nsCachedStyleData() {}
};
/**
* nsRuleNode is a node in a lexicographic tree (the "rule tree")
* indexed by style rules (implementations of nsIStyleRule).
*
* The rule tree is owned by the nsStyleSet and is destroyed when the
* presentation of the document goes away. It is garbage-collected
* (using mark-and-sweep garbage collection) during the lifetime of the
* document (when dynamic changes cause the destruction of enough style
* contexts). Rule nodes are marked if they are pointed to by a style
* context or one of their descendants is.
*
* An nsStyleContext, which represents the computed style data for an
* element, points to an nsRuleNode. The path from the root of the rule
* tree to the nsStyleContext's mRuleNode gives the list of the rules
* matched, from least important in the cascading order to most
* important in the cascading order.
*
* The reason for using a lexicographic tree is that it allows for
* sharing of style data, which saves both memory (for storing the
* computed style data) and time (for computing them). This sharing
* depends on the computed style data being stored in structs (nsStyle*)
* that contain only properties that are inherited by default
* ("inherited structs") or structs that contain only properties that
* are not inherited by default ("reset structs"). The optimization
* depends on the normal case being that style rules specify relatively
* few properties and even that elements generally have relatively few
* properties specified. This allows sharing in the following ways:
* 1. [mainly reset structs] When a style data struct will contain the
* same computed value for any elements that match the same set of
* rules (common for reset structs), it can be stored on the
* nsRuleNode instead of on the nsStyleContext.
* 2. [only? reset structs] When (1) occurs, and an nsRuleNode doesn't
* have any rules that change the values in the struct, the
* nsRuleNode can share that struct with its parent nsRuleNode.
* 3. [mainly inherited structs] When an element doesn't match any
* rules that change the value of a property (or, in the edge case,
* when all the values specified are 'inherit'), the nsStyleContext
* can use the same nsStyle* struct as its parent nsStyleContext.
*
* Since the data represented by an nsIStyleRule are immutable, the data
* represented by an nsRuleNode are also immutable.
*/
class nsRuleNode {
public:
enum RuleDetail {
eRuleNone, // No props have been specified at all.
eRulePartialReset, // At least one prop with a non-"inherit" value
// has been specified. No props have been
// specified with an "inherit" value. At least
// one prop remains unspecified.
eRulePartialMixed, // At least one prop with a non-"inherit" value
// has been specified. Some props may also have
// been specified with an "inherit" value. At
// least one prop remains unspecified.
eRulePartialInherited, // Only props with "inherit" values have
// have been specified. At least one prop
// remains unspecified.
eRuleFullReset, // All props have been specified. None has an
// "inherit" value.
eRuleFullMixed, // All props have been specified. At least one has
// a non-"inherit" value.
eRuleFullInherited // All props have been specified with "inherit"
// values.
};
private:
nsPresContext* mPresContext; // Our pres context.
nsRuleNode* mParent; // A pointer to the parent node in the tree.
// This enables us to walk backwards from the
// most specific rule matched to the least
// specific rule (which is the optimal order to
// use for lookups of style properties.
nsIStyleRule* mRule; // [STRONG] A pointer to our specific rule.
nsRuleNode* mNextSibling; // This value should be used only by the
// parent, since the parent may store
// children in a hash, which means this
// pointer is not meaningful. Order of
// siblings is also not meaningful.
struct Key {
nsIStyleRule* mRule;
PRUint8 mLevel;
PRPackedBool mIsImportantRule;
Key(nsIStyleRule* aRule, PRUint8 aLevel, PRPackedBool aIsImportantRule)
: mRule(aRule), mLevel(aLevel), mIsImportantRule(aIsImportantRule)
{}
PRBool operator==(const Key& aOther) const
{
return mRule == aOther.mRule &&
mLevel == aOther.mLevel &&
mIsImportantRule == aOther.mIsImportantRule;
}
PRBool operator!=(const Key& aOther) const
{
return !(*this == aOther);
}
};
static PLDHashNumber
ChildrenHashHashKey(PLDHashTable *aTable, const void *aKey);
static PRBool
ChildrenHashMatchEntry(PLDHashTable *aTable,
const PLDHashEntryHdr *aHdr,
const void *aKey);
static PLDHashTableOps ChildrenHashOps;
static PLDHashOperator
EnqueueRuleNodeChildren(PLDHashTable *table, PLDHashEntryHdr *hdr,
PRUint32 number, void *arg);
Key GetKey() const {
return Key(mRule, GetLevel(), IsImportantRule());
}
// The children of this node are stored in either a hashtable or list
// that maps from rules to our nsRuleNode children. When matching
// rules, we use this mapping to transition from node to node
// (constructing new nodes as needed to flesh out the tree).
union {
void* asVoid;
nsRuleNode* asList;
PLDHashTable* asHash;
} mChildren; // Accessed only through the methods below.
enum {
kTypeMask = 0x1,
kListType = 0x0,
kHashType = 0x1
};
enum {
// Maximum to have in a list before converting to a hashtable.
// XXX Need to optimize this.
kMaxChildrenInList = 32
};
PRBool HaveChildren() const {
return mChildren.asVoid != nsnull;
}
PRBool ChildrenAreHashed() {
return (PRWord(mChildren.asVoid) & kTypeMask) == kHashType;
}
nsRuleNode* ChildrenList() {
return mChildren.asList;
}
nsRuleNode** ChildrenListPtr() {
return &mChildren.asList;
}
PLDHashTable* ChildrenHash() {
return (PLDHashTable*) (PRWord(mChildren.asHash) & ~PRWord(kTypeMask));
}
void SetChildrenList(nsRuleNode *aList) {
NS_ASSERTION(!(PRWord(aList) & kTypeMask),
"pointer not 2-byte aligned");
mChildren.asList = aList;
}
void SetChildrenHash(PLDHashTable *aHashtable) {
NS_ASSERTION(!(PRWord(aHashtable) & kTypeMask),
"pointer not 2-byte aligned");
mChildren.asHash = (PLDHashTable*)(PRWord(aHashtable) | kHashType);
}
void ConvertChildrenToHash();
nsCachedStyleData mStyleData; // Any data we cached on the rule node.
PRUint32 mDependentBits; // Used to cache the fact that we can look up
// cached data under a parent rule.
PRUint32 mNoneBits; // Used to cache the fact that the branch to this
// node specifies no non-inherited data for a
// given struct type. (This usually implies that
// the entire branch specifies no non-inherited
// data, although not necessarily, if a
// non-inherited value is overridden by an
// explicit 'inherit' value.) For example, if an
// entire rule branch specifies no color
// information, then a bit will be set along every
// rule node on that branch, so that you can break
// out of the rule tree early and just inherit
// from the parent style context. The presence of
// this bit means we should just get inherited
// data from the parent style context, and it is
// never used for reset structs since their
// Compute*Data functions don't initialize from
// inherited data.
// Reference count. This just counts the style contexts that
// reference this rulenode. When this goes to 0 or stops being 0,
// we notify the style set.
PRUint32 mRefCnt;
public:
// Overloaded new operator. Initializes the memory to 0 and relies on an arena
// (which comes from the presShell) to perform the allocation.
void* operator new(size_t sz, nsPresContext* aContext) CPP_THROW_NEW;
void Destroy() { DestroyInternal(nsnull); }
static nsILanguageAtomService* gLangService;
// Implemented in nsStyleSet.h, since it needs to know about nsStyleSet.
inline void AddRef();
// Implemented in nsStyleSet.h, since it needs to know about nsStyleSet.
inline void Release();
protected:
void DestroyInternal(nsRuleNode ***aDestroyQueueTail);
void PropagateDependentBit(PRUint32 aBit, nsRuleNode* aHighestNode);
void PropagateNoneBit(PRUint32 aBit, nsRuleNode* aHighestNode);
const void* SetDefaultOnRoot(const nsStyleStructID aSID,
nsStyleContext* aContext);
const void*
WalkRuleTree(const nsStyleStructID aSID, nsStyleContext* aContext,
nsRuleData* aRuleData, nsRuleDataStruct* aSpecificData);
const void*
ComputeDisplayData(void* aStartStruct,
const nsRuleDataStruct& aData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
RuleDetail aRuleDetail,
const PRBool aCanStoreInRuleTree);
const void*
ComputeVisibilityData(void* aStartStruct,
const nsRuleDataStruct& aData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
RuleDetail aRuleDetail,
const PRBool aCanStoreInRuleTree);
const void*
ComputeFontData(void* aStartStruct,
const nsRuleDataStruct& aData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
RuleDetail aRuleDetail,
const PRBool aCanStoreInRuleTree);
const void*
ComputeColorData(void* aStartStruct,
const nsRuleDataStruct& aData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
RuleDetail aRuleDetail,
const PRBool aCanStoreInRuleTree);
const void*
ComputeBackgroundData(void* aStartStruct,
const nsRuleDataStruct& aData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
RuleDetail aRuleDetail,
const PRBool aCanStoreInRuleTree);
const void*
ComputeMarginData(void* aStartStruct,
const nsRuleDataStruct& aData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
RuleDetail aRuleDetail,
const PRBool aCanStoreInRuleTree);
const void*
ComputeBorderData(void* aStartStruct,
const nsRuleDataStruct& aData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
RuleDetail aRuleDetail,
const PRBool aCanStoreInRuleTree);
const void*
ComputePaddingData(void* aStartStruct,
const nsRuleDataStruct& aData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
RuleDetail aRuleDetail,
const PRBool aCanStoreInRuleTree);
const void*
ComputeOutlineData(void* aStartStruct,
const nsRuleDataStruct& aData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
RuleDetail aRuleDetail,
const PRBool aCanStoreInRuleTree);
const void*
ComputeListData(void* aStartStruct,
const nsRuleDataStruct& aData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
RuleDetail aRuleDetail,
const PRBool aCanStoreInRuleTree);
const void*
ComputePositionData(void* aStartStruct,
const nsRuleDataStruct& aData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
RuleDetail aRuleDetail,
const PRBool aCanStoreInRuleTree);
const void*
ComputeTableData(void* aStartStruct,
const nsRuleDataStruct& aData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
RuleDetail aRuleDetail,
const PRBool aCanStoreInRuleTree);
const void*
ComputeTableBorderData(void* aStartStruct,
const nsRuleDataStruct& aData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
RuleDetail aRuleDetail,
const PRBool aCanStoreInRuleTree);
const void*
ComputeContentData(void* aStartStruct,
const nsRuleDataStruct& aData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
RuleDetail aRuleDetail,
const PRBool aCanStoreInRuleTree);
const void*
ComputeQuotesData(void* aStartStruct,
const nsRuleDataStruct& aData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
RuleDetail aRuleDetail,
const PRBool aCanStoreInRuleTree);
const void*
ComputeTextData(void* aStartStruct,
const nsRuleDataStruct& aData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
RuleDetail aRuleDetail,
const PRBool aCanStoreInRuleTree);
const void*
ComputeTextResetData(void* aStartStruct,
const nsRuleDataStruct& aData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
RuleDetail aRuleDetail,
const PRBool aCanStoreInRuleTree);
const void*
ComputeUserInterfaceData(void* aStartStruct,
const nsRuleDataStruct& aData,
nsStyleContext* aContext,
nsRuleNode* aHighestNode,
RuleDetail aRuleDetail,
const PRBool aCanStoreInRuleTree);
const void*
ComputeUIResetData(void* aStartStruct,
const nsRuleDataStruct& aData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
RuleDetail aRuleDetail,
const PRBool aCanStoreInRuleTree);
const void*
ComputeXULData(void* aStartStruct,
const nsRuleDataStruct& aData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
RuleDetail aRuleDetail,
const PRBool aCanStoreInRuleTree);
const void*
ComputeColumnData(void* aStartStruct,
const nsRuleDataStruct& aData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
RuleDetail aRuleDetail,
const PRBool aCanStoreInRuleTree);
const void*
ComputeSVGData(void* aStartStruct,
const nsRuleDataStruct& aData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
RuleDetail aRuleDetail,
const PRBool aCanStoreInRuleTree);
const void*
ComputeSVGResetData(void* aStartStruct,
const nsRuleDataStruct& aData,
nsStyleContext* aContext, nsRuleNode* aHighestNode,
RuleDetail aRuleDetail,
const PRBool aCanStoreInRuleTree);
// helpers for |ComputeFontData| that need access to |mNoneBits|:
static void SetFontSize(nsPresContext* aPresContext,
const nsRuleDataFont& aFontData,
const nsStyleFont* aFont,
const nsStyleFont* aParentFont,
nscoord* aSize,
const nsFont& aSystemFont,
nscoord aParentSize,
nscoord aScriptLevelAdjustedParentSize,
PRBool aUsedStartStruct,
PRBool aAtRoot,
PRBool& aCanStoreInRuleTree);
static void SetFont(nsPresContext* aPresContext,
nsStyleContext* aContext,
nscoord aMinFontSize,
PRUint8 aGenericFontID,
const nsRuleDataFont& aFontData,
const nsStyleFont* aParentFont,
nsStyleFont* aFont,
PRBool aStartStruct,
PRBool& aCanStoreInRuleTree);
static void SetGenericFont(nsPresContext* aPresContext,
nsStyleContext* aContext,
PRUint8 aGenericFontID,
nscoord aMinFontSize,
nsStyleFont* aFont);
void AdjustLogicalBoxProp(nsStyleContext* aContext,
const nsCSSValue& aLTRSource,
const nsCSSValue& aRTLSource,
const nsCSSValue& aLTRLogicalValue,
const nsCSSValue& aRTLLogicalValue,
PRUint8 aSide,
nsCSSRect& aValueRect,
PRBool& aCanStoreInRuleTree);
inline RuleDetail CheckSpecifiedProperties(const nsStyleStructID aSID, const nsRuleDataStruct& aRuleDataStruct);
const void* GetParentData(const nsStyleStructID aSID);
#define STYLE_STRUCT(name_, checkdata_cb_, ctor_args_) \
const nsStyle##name_* GetParent##name_();
#include "nsStyleStructList.h"
#undef STYLE_STRUCT
const void* GetDisplayData(nsStyleContext* aContext);
const void* GetVisibilityData(nsStyleContext* aContext);
const void* GetFontData(nsStyleContext* aContext);
const void* GetColorData(nsStyleContext* aContext);
const void* GetBackgroundData(nsStyleContext* aContext);
const void* GetMarginData(nsStyleContext* aContext);
const void* GetBorderData(nsStyleContext* aContext);
const void* GetPaddingData(nsStyleContext* aContext);
const void* GetOutlineData(nsStyleContext* aContext);
const void* GetListData(nsStyleContext* aContext);
const void* GetPositionData(nsStyleContext* aContext);
const void* GetTableData(nsStyleContext* aContext);
const void* GetTableBorderData(nsStyleContext* aContext);
const void* GetContentData(nsStyleContext* aContext);
const void* GetQuotesData(nsStyleContext* aContext);
const void* GetTextData(nsStyleContext* aContext);
const void* GetTextResetData(nsStyleContext* aContext);
const void* GetUserInterfaceData(nsStyleContext* aContext);
const void* GetUIResetData(nsStyleContext* aContext);
const void* GetXULData(nsStyleContext* aContext);
const void* GetColumnData(nsStyleContext* aContext);
const void* GetSVGData(nsStyleContext* aContext);
const void* GetSVGResetData(nsStyleContext* aContext);
already_AddRefed<nsCSSShadowArray>
GetShadowData(nsCSSValueList* aList,
nsStyleContext* aContext,
PRBool aIsBoxShadow,
PRBool& inherited);
private:
nsRuleNode(nsPresContext* aPresContext, nsRuleNode* aParent,
nsIStyleRule* aRule, PRUint8 aLevel, PRBool aIsImportant);
~nsRuleNode();
public:
static nsRuleNode* CreateRootNode(nsPresContext* aPresContext);
// Transition never returns null; on out of memory it'll just return |this|.
nsRuleNode* Transition(nsIStyleRule* aRule, PRUint8 aLevel,
PRPackedBool aIsImportantRule);
nsRuleNode* GetParent() const { return mParent; }
PRBool IsRoot() const { return mParent == nsnull; }
// These PRUint8s are really nsStyleSet::sheetType values.
PRUint8 GetLevel() const {
NS_ASSERTION(!IsRoot(), "can't call on root");
return (mDependentBits & NS_RULE_NODE_LEVEL_MASK) >>
NS_RULE_NODE_LEVEL_SHIFT;
}
PRBool IsImportantRule() const {
NS_ASSERTION(!IsRoot(), "can't call on root");
return (mDependentBits & NS_RULE_NODE_IS_IMPORTANT) != 0;
}
// NOTE: Does not |AddRef|.
nsIStyleRule* GetRule() const { return mRule; }
// NOTE: Does not |AddRef|.
nsPresContext* GetPresContext() const { return mPresContext; }
const void* GetStyleData(nsStyleStructID aSID,
nsStyleContext* aContext,
PRBool aComputeData);
#define STYLE_STRUCT(name_, checkdata_cb_, ctor_args_) \
const nsStyle##name_* GetStyle##name_(nsStyleContext* aContext, \
PRBool aComputeData);
#include "nsStyleStructList.h"
#undef STYLE_STRUCT
/*
* Garbage collection. Mark walks up the tree, marking any unmarked
* ancestors until it reaches a marked one. Sweep recursively sweeps
* the children, destroys any that are unmarked, and clears marks,
* returning true if the node on which it was called was destroyed.
*/
void Mark();
PRBool Sweep();
static PRBool
HasAuthorSpecifiedRules(nsStyleContext* aStyleContext,
PRUint32 ruleTypeMask,
PRBool aAuthorColorsAllowed);
// Expose this so media queries can use it
static nscoord CalcLengthWithInitialFont(nsPresContext* aPresContext,
const nsCSSValue& aValue);
// Expose this so nsTransformFunctions can use it.
static nscoord CalcLength(const nsCSSValue& aValue,
nsStyleContext* aStyleContext,
nsPresContext* aPresContext,
PRBool& aCanStoreInRuleTree);
// Return whether the rule tree for which this node is the root has
// cached data such that we need to do dynamic change handling for
// changes that change the results of media queries or require
// rebuilding all style data.
PRBool TreeHasCachedData() const {
NS_ASSERTION(IsRoot(), "should only be called on root of rule tree");
return HaveChildren() || mStyleData.mInheritedData || mStyleData.mResetData;
}
};
#endif
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