mirror of
https://github.com/mozilla/gecko-dev.git
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5b55368eda
This introduces a basic framework for servo's style system to be able to query the style of presentation attributes which it can then insert into the cascade. It uses that framework to implement the size and color attributes on <font>. There are a number of improvements that can be done on top of this: - Implement all other properties - Abstractify the ruledata parameter of the mappers using templates or virtual dispatch so that it can be a Servo decl block instead - Implement aforementiond abstraction over Servo decl blocks (this obsoletes the code in the first item above, so it might just be better to skip that and directly do this) - Replace uses of nsHTMLStyleSheet with an abstract base class containing common elements between Servo and Gecko I'd prefer for these to be done in separate steps. MozReview-Commit-ID: GO60qfeZOfl --HG-- extra : rebase_source : 516d369a8627e413983361aaf85ccb7132b0a06c
1115 lines
46 KiB
C++
1115 lines
46 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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* a node in the lexicographic tree of rules that match an element,
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* responsible for converting the rules' information into computed style
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*/
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#ifndef nsRuleNode_h___
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#define nsRuleNode_h___
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#include "mozilla/ArenaObjectID.h"
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#include "mozilla/LinkedList.h"
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#include "mozilla/PodOperations.h"
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#include "mozilla/RangedArray.h"
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#include "mozilla/RuleNodeCacheConditions.h"
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#include "mozilla/SheetType.h"
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#include "nsPresContext.h"
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#include "nsStyleStruct.h"
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class nsCSSPropertyIDSet;
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class nsCSSValue;
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class nsIStyleRule;
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class nsStyleContext;
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class nsStyleCoord;
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struct nsCSSRect;
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struct nsCSSValueList;
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struct nsCSSValuePairList;
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struct nsRuleData;
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struct nsInheritedStyleData
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{
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mozilla::RangedArray<void*,
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nsStyleStructID_Inherited_Start,
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nsStyleStructID_Inherited_Count> mStyleStructs;
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void* operator new(size_t sz, nsPresContext* aContext) {
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return aContext->PresShell()->
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AllocateByObjectID(mozilla::eArenaObjectID_nsInheritedStyleData, sz);
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}
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void DestroyStructs(uint64_t aBits, nsPresContext* aContext) {
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#define STYLE_STRUCT_INHERITED(name, checkdata_cb) \
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void *name##Data = mStyleStructs[eStyleStruct_##name]; \
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if (name##Data && !(aBits & NS_STYLE_INHERIT_BIT(name))) \
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static_cast<nsStyle##name*>(name##Data)->Destroy(aContext);
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#define STYLE_STRUCT_RESET(name, checkdata_cb)
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#include "nsStyleStructList.h"
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#undef STYLE_STRUCT_INHERITED
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#undef STYLE_STRUCT_RESET
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}
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void Destroy(uint64_t aBits, nsPresContext* aContext) {
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DestroyStructs(aBits, aContext);
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aContext->PresShell()->
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FreeByObjectID(mozilla::eArenaObjectID_nsInheritedStyleData, this);
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}
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nsInheritedStyleData() {
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for (nsStyleStructID i = nsStyleStructID_Inherited_Start;
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i < nsStyleStructID_Inherited_Start + nsStyleStructID_Inherited_Count;
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i = nsStyleStructID(i + 1)) {
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mStyleStructs[i] = nullptr;
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}
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}
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};
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struct nsResetStyleData
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{
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mozilla::RangedArray<void*,
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nsStyleStructID_Reset_Start,
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nsStyleStructID_Reset_Count> mStyleStructs;
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nsResetStyleData()
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{
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for (nsStyleStructID i = nsStyleStructID_Reset_Start;
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i < nsStyleStructID_Reset_Start + nsStyleStructID_Reset_Count;
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i = nsStyleStructID(i + 1)) {
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mStyleStructs[i] = nullptr;
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}
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}
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void* operator new(size_t sz, nsPresContext* aContext) {
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return aContext->PresShell()->
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AllocateByObjectID(mozilla::eArenaObjectID_nsResetStyleData, sz);
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}
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void Destroy(uint64_t aBits, nsPresContext* aContext) {
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#define STYLE_STRUCT_RESET(name, checkdata_cb) \
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void *name##Data = mStyleStructs[eStyleStruct_##name]; \
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if (name##Data && !(aBits & NS_STYLE_INHERIT_BIT(name))) \
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static_cast<nsStyle##name*>(name##Data)->Destroy(aContext);
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#define STYLE_STRUCT_INHERITED(name, checkdata_cb)
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#include "nsStyleStructList.h"
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#undef STYLE_STRUCT_RESET
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#undef STYLE_STRUCT_INHERITED
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aContext->PresShell()->
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FreeByObjectID(mozilla::eArenaObjectID_nsResetStyleData, this);
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}
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};
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struct nsConditionalResetStyleData
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{
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static uint32_t GetBitForSID(const nsStyleStructID aSID) {
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return 1 << aSID;
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}
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struct Entry
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{
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Entry(const mozilla::RuleNodeCacheConditions& aConditions,
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void* aStyleStruct,
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Entry* aNext)
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: mConditions(aConditions), mStyleStruct(aStyleStruct), mNext(aNext) {}
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void* operator new(size_t sz, nsPresContext* aContext) {
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return aContext->PresShell()->AllocateByObjectID(
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mozilla::eArenaObjectID_nsConditionalResetStyleDataEntry, sz);
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}
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const mozilla::RuleNodeCacheConditions mConditions;
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void* const mStyleStruct;
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Entry* const mNext;
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};
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// Each entry is either a pointer to a style struct or a
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// pointer to an Entry object. A bit in mConditionalBits
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// means that it is an Entry.
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mozilla::RangedArray<void*,
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nsStyleStructID_Reset_Start,
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nsStyleStructID_Reset_Count> mEntries;
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uint32_t mConditionalBits;
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nsConditionalResetStyleData()
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{
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for (nsStyleStructID i = nsStyleStructID_Reset_Start;
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i < nsStyleStructID_Reset_Start + nsStyleStructID_Reset_Count;
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i = nsStyleStructID(i + 1)) {
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mEntries[i] = nullptr;
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}
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mConditionalBits = 0;
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}
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void* operator new(size_t sz, nsPresContext* aContext) {
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return aContext->PresShell()->AllocateByObjectID(
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mozilla::eArenaObjectID_nsConditionalResetStyleData, sz);
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}
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void* GetStyleData(nsStyleStructID aSID) const {
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if (mConditionalBits & GetBitForSID(aSID)) {
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return nullptr;
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}
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return mEntries[aSID];
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}
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void* GetStyleData(nsStyleStructID aSID,
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nsStyleContext* aStyleContext,
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bool aCanComputeData) const {
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if (!(mConditionalBits & GetBitForSID(aSID))) {
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return mEntries[aSID];
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}
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if (!aCanComputeData) {
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// If aCanComputeData is false, then any previously-computed data
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// would have been cached on the style context. Therefore it's
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// unnecessary to check the conditional data. It's also
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// incorrect, because calling e->mConditions.Matches() below could
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// cause additional structs to be computed, which is incorrect
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// during CalcStyleDifference.
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return nullptr;
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}
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return GetConditionalStyleData(aSID, aStyleContext);
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}
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private:
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// non-inline helper for GetStyleData
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void* GetConditionalStyleData(nsStyleStructID aSID,
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nsStyleContext* aStyleContext) const;
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public:
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void SetStyleData(nsStyleStructID aSID, void* aStyleStruct) {
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MOZ_ASSERT(!(mConditionalBits & GetBitForSID(aSID)),
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"rule node should not have unconditional and conditional style "
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"data for a given struct");
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mEntries[aSID] = aStyleStruct;
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}
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void SetStyleData(nsStyleStructID aSID,
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nsPresContext* aPresContext,
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void* aStyleStruct,
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const mozilla::RuleNodeCacheConditions& aConditions) {
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MOZ_ASSERT((mConditionalBits & GetBitForSID(aSID)) ||
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!mEntries[aSID],
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"rule node should not have unconditional and conditional style "
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"data for a given struct");
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MOZ_ASSERT(aConditions.CacheableWithDependencies(),
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"don't call SetStyleData with a cache key that has no "
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"conditions or is uncacheable");
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#ifdef DEBUG
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for (Entry* e = static_cast<Entry*>(mEntries[aSID]); e; e = e->mNext) {
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NS_WARNING_ASSERTION(e->mConditions != aConditions,
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"wasteful to have duplicate conditional style data");
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}
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#endif
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mConditionalBits |= GetBitForSID(aSID);
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mEntries[aSID] =
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new (aPresContext) Entry(aConditions, aStyleStruct,
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static_cast<Entry*>(mEntries[aSID]));
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}
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void Destroy(uint64_t aBits, nsPresContext* aContext) {
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#define STYLE_STRUCT_RESET(name, checkdata_cb) \
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void* name##Ptr = mEntries[eStyleStruct_##name]; \
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if (name##Ptr) { \
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if (!(mConditionalBits & NS_STYLE_INHERIT_BIT(name))) { \
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if (!(aBits & NS_STYLE_INHERIT_BIT(name))) { \
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static_cast<nsStyle##name*>(name##Ptr)->Destroy(aContext); \
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} \
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} else { \
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Entry* e = static_cast<Entry*>(name##Ptr); \
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MOZ_ASSERT(e, "if mConditionalBits bit is set, we must have at least " \
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"one conditional style struct"); \
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do { \
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static_cast<nsStyle##name*>(e->mStyleStruct)->Destroy(aContext); \
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Entry* next = e->mNext; \
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aContext->PresShell()->FreeByObjectID( \
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mozilla::eArenaObjectID_nsConditionalResetStyleDataEntry, e); \
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e = next; \
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} while (e); \
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} \
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}
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#define STYLE_STRUCT_INHERITED(name, checkdata_cb)
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#include "nsStyleStructList.h"
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#undef STYLE_STRUCT_RESET
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#undef STYLE_STRUCT_INHERITED
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aContext->PresShell()->FreeByObjectID(
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mozilla::eArenaObjectID_nsConditionalResetStyleData, this);
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}
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};
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struct nsCachedStyleData
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{
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nsInheritedStyleData* mInheritedData;
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nsConditionalResetStyleData* mResetData;
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static bool IsReset(const nsStyleStructID aSID) {
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MOZ_ASSERT(0 <= aSID && aSID < nsStyleStructID_Length,
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"must be an inherited or reset SID");
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return nsStyleStructID_Reset_Start <= aSID;
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}
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static bool IsInherited(const nsStyleStructID aSID) {
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return !IsReset(aSID);
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}
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static uint32_t GetBitForSID(const nsStyleStructID aSID) {
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return nsConditionalResetStyleData::GetBitForSID(aSID);
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}
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void* NS_FASTCALL GetStyleData(const nsStyleStructID aSID) {
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if (IsReset(aSID)) {
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if (mResetData) {
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return mResetData->GetStyleData(aSID);
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}
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} else {
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if (mInheritedData) {
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return mInheritedData->mStyleStructs[aSID];
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}
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}
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return nullptr;
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}
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void* NS_FASTCALL GetStyleData(const nsStyleStructID aSID,
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nsStyleContext* aStyleContext,
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bool aCanComputeData) {
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if (IsReset(aSID)) {
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if (mResetData) {
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return mResetData->GetStyleData(aSID, aStyleContext, aCanComputeData);
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}
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} else {
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if (mInheritedData) {
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return mInheritedData->mStyleStructs[aSID];
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}
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}
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return nullptr;
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}
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void NS_FASTCALL SetStyleData(const nsStyleStructID aSID,
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nsPresContext *aPresContext, void *aData) {
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if (IsReset(aSID)) {
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if (!mResetData) {
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mResetData = new (aPresContext) nsConditionalResetStyleData;
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}
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mResetData->SetStyleData(aSID, aData);
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} else {
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if (!mInheritedData) {
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mInheritedData = new (aPresContext) nsInheritedStyleData;
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}
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mInheritedData->mStyleStructs[aSID] = aData;
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}
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}
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// Typesafe and faster versions of the above
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#define STYLE_STRUCT_INHERITED(name_, checkdata_cb_) \
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nsStyle##name_ * NS_FASTCALL GetStyle##name_ () { \
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return mInheritedData ? static_cast<nsStyle##name_*>( \
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mInheritedData->mStyleStructs[eStyleStruct_##name_]) : nullptr; \
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}
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#define STYLE_STRUCT_RESET(name_, checkdata_cb_) \
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nsStyle##name_ * NS_FASTCALL GetStyle##name_ (nsStyleContext* aContext, \
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bool aCanComputeData) { \
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return mResetData ? static_cast<nsStyle##name_*>( \
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mResetData->GetStyleData(eStyleStruct_##name_, aContext, \
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aCanComputeData)) \
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: nullptr; \
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}
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#include "nsStyleStructList.h"
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#undef STYLE_STRUCT_RESET
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#undef STYLE_STRUCT_INHERITED
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void Destroy(uint64_t aBits, nsPresContext* aContext) {
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if (mResetData)
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mResetData->Destroy(aBits, aContext);
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if (mInheritedData)
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mInheritedData->Destroy(aBits, aContext);
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mResetData = nullptr;
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mInheritedData = nullptr;
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}
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nsCachedStyleData() :mInheritedData(nullptr), mResetData(nullptr) {}
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~nsCachedStyleData() {}
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};
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/**
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* nsRuleNode is a node in a lexicographic tree (the "rule tree")
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* indexed by style rules (implementations of nsIStyleRule).
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*
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* The rule tree is owned by the nsStyleSet and is destroyed when the
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* presentation of the document goes away. Its entries are reference-
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* counted, with strong references held by child nodes, style structs
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* and (for the root), the style set. Rule nodes are not immediately
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* destroyed when their reference-count drops to zero, but are instead
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* destroyed during a GC sweep.
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*
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* An nsStyleContext, which represents the computed style data for an
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* element, points to an nsRuleNode. The path from the root of the rule
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* tree to the nsStyleContext's mRuleNode gives the list of the rules
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* matched, from least important in the cascading order to most
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* important in the cascading order.
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*
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* The reason for using a lexicographic tree is that it allows for
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* sharing of style data, which saves both memory (for storing the
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* computed style data) and time (for computing them). This sharing
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* depends on the computed style data being stored in structs (nsStyle*)
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* that contain only properties that are inherited by default
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* ("inherited structs") or structs that contain only properties that
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* are not inherited by default ("reset structs"). The optimization
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* depends on the normal case being that style rules specify relatively
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* few properties and even that elements generally have relatively few
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* properties specified. This allows sharing in the following ways:
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* 1. [mainly reset structs] When a style data struct will contain the
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* same computed value for any elements that match the same set of
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* rules (common for reset structs), it can be stored on the
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* nsRuleNode instead of on the nsStyleContext.
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* 2. [only? reset structs] When (1) occurs, and an nsRuleNode doesn't
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* have any rules that change the values in the struct, the
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* nsRuleNode can share that struct with its parent nsRuleNode.
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* 3. [mainly inherited structs] When an element doesn't match any
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* rules that change the value of a property (or, in the edge case,
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* when all the values specified are 'inherit'), the nsStyleContext
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* can use the same nsStyle* struct as its parent nsStyleContext.
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*
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* Since the data represented by an nsIStyleRule are immutable, the data
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* represented by an nsRuleNode are also immutable.
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*/
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enum nsFontSizeType {
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eFontSize_HTML = 1,
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eFontSize_CSS = 2
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};
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// Note: This LinkedListElement is used for storing unused nodes in the
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// linked list on nsStyleSet. We use mNextSibling for the singly-linked
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// sibling list.
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class nsRuleNode : public mozilla::LinkedListElement<nsRuleNode> {
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public:
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enum RuleDetail {
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eRuleNone, // No props have been specified at all.
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eRulePartialReset, // At least one prop with a non-"inherit" value
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// has been specified. No props have been
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// specified with an "inherit" value. At least
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// one prop remains unspecified.
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eRulePartialMixed, // At least one prop with a non-"inherit" value
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// has been specified. Some props may also have
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// been specified with an "inherit" value. At
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// least one prop remains unspecified.
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eRulePartialInherited, // Only props with "inherit" values have
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// have been specified. At least one prop
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// remains unspecified.
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eRuleFullReset, // All props have been specified. None has an
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// "inherit" value.
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eRuleFullMixed, // All props have been specified. At least one has
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// a non-"inherit" value.
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eRuleFullInherited // All props have been specified with "inherit"
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// values.
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};
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private:
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nsPresContext* const mPresContext; // Our pres context.
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const RefPtr<nsRuleNode> mParent; // A pointer to the parent node in the tree.
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// This enables us to walk backwards from the
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// most specific rule matched to the least
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// specific rule (which is the optimal order to
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// use for lookups of style properties.
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const nsCOMPtr<nsIStyleRule> mRule; // A pointer to our specific rule.
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nsRuleNode* mNextSibling; // This value should be used only by the
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// parent, since the parent may store
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// children in a hash, which means this
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// pointer is not meaningful. Order of
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// siblings is also not meaningful.
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struct Key {
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nsIStyleRule* mRule;
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mozilla::SheetType mLevel;
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bool mIsImportantRule;
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Key(nsIStyleRule* aRule, mozilla::SheetType aLevel, bool aIsImportantRule)
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: mRule(aRule), mLevel(aLevel), mIsImportantRule(aIsImportantRule)
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{}
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bool operator==(const Key& aOther) const
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|
{
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return mRule == aOther.mRule &&
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mLevel == aOther.mLevel &&
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mIsImportantRule == aOther.mIsImportantRule;
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}
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bool operator!=(const Key& aOther) const
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{
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return !(*this == aOther);
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}
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};
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static PLDHashNumber
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ChildrenHashHashKey(const void *aKey);
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static bool
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ChildrenHashMatchEntry(const PLDHashEntryHdr *aHdr, const void *aKey);
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static const PLDHashTableOps ChildrenHashOps;
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Key GetKey() const {
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return Key(mRule, GetLevel(), IsImportantRule());
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}
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// The children of this node are stored in either a hashtable or list
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// that maps from rules to our nsRuleNode children. When matching
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// rules, we use this mapping to transition from node to node
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// (constructing new nodes as needed to flesh out the tree).
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|
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
|
|
};
|
|
|
|
bool HaveChildren() const {
|
|
return mChildren.asVoid != nullptr;
|
|
}
|
|
bool ChildrenAreHashed() {
|
|
return (intptr_t(mChildren.asVoid) & kTypeMask) == kHashType;
|
|
}
|
|
nsRuleNode* ChildrenList() {
|
|
return mChildren.asList;
|
|
}
|
|
nsRuleNode** ChildrenListPtr() {
|
|
return &mChildren.asList;
|
|
}
|
|
PLDHashTable* ChildrenHash() {
|
|
return (PLDHashTable*) (intptr_t(mChildren.asHash) & ~intptr_t(kTypeMask));
|
|
}
|
|
void SetChildrenList(nsRuleNode *aList) {
|
|
NS_ASSERTION(!(intptr_t(aList) & kTypeMask),
|
|
"pointer not 2-byte aligned");
|
|
mChildren.asList = aList;
|
|
}
|
|
void SetChildrenHash(PLDHashTable *aHashtable) {
|
|
NS_ASSERTION(!(intptr_t(aHashtable) & kTypeMask),
|
|
"pointer not 2-byte aligned");
|
|
mChildren.asHash = (PLDHashTable*)(intptr_t(aHashtable) | kHashType);
|
|
}
|
|
void ConvertChildrenToHash(int32_t aNumKids);
|
|
|
|
void RemoveChild(nsRuleNode* aNode);
|
|
|
|
nsCachedStyleData mStyleData; // Any data we cached on the rule node.
|
|
|
|
uint32_t mDependentBits; // Used to cache the fact that we can look up
|
|
// cached data under a parent rule.
|
|
|
|
uint32_t 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. Style contexts hold strong references to their rule node,
|
|
// and rule nodes hold strong references to their parent.
|
|
//
|
|
// When the refcount drops to zero, we don't necessarily free the node.
|
|
// Instead, we notify the style set, which performs periodic sweeps.
|
|
uint32_t mRefCnt;
|
|
|
|
public:
|
|
// Infallible overloaded new operator that allocates from a presShell arena.
|
|
void* operator new(size_t sz, nsPresContext* aContext);
|
|
void Destroy();
|
|
|
|
// 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 PropagateDependentBit(nsStyleStructID aSID, nsRuleNode* aHighestNode,
|
|
void* aStruct);
|
|
void PropagateNoneBit(uint32_t aBit, nsRuleNode* aHighestNode);
|
|
static void PropagateGrandancestorBit(nsStyleContext* aContext,
|
|
nsStyleContext* aContextInheritedFrom);
|
|
|
|
const void* SetDefaultOnRoot(const nsStyleStructID aSID,
|
|
nsStyleContext* aContext);
|
|
|
|
/**
|
|
* Resolves any property values in aRuleData for a given style struct that
|
|
* have eCSSUnit_TokenStream values, by resolving them against the computed
|
|
* variable values on the style context and re-parsing the property.
|
|
*
|
|
* @return Whether any properties with eCSSUnit_TokenStream values were
|
|
* encountered.
|
|
*/
|
|
static bool ResolveVariableReferences(const nsStyleStructID aSID,
|
|
nsRuleData* aRuleData,
|
|
nsStyleContext* aContext);
|
|
|
|
const void*
|
|
WalkRuleTree(const nsStyleStructID aSID, nsStyleContext* aContext);
|
|
|
|
const void*
|
|
ComputeDisplayData(void* aStartStruct,
|
|
const nsRuleData* aRuleData,
|
|
nsStyleContext* aContext, nsRuleNode* aHighestNode,
|
|
RuleDetail aRuleDetail,
|
|
const mozilla::RuleNodeCacheConditions aConditions);
|
|
|
|
const void*
|
|
ComputeVisibilityData(void* aStartStruct,
|
|
const nsRuleData* aRuleData,
|
|
nsStyleContext* aContext, nsRuleNode* aHighestNode,
|
|
RuleDetail aRuleDetail,
|
|
const mozilla::RuleNodeCacheConditions aConditions);
|
|
|
|
const void*
|
|
ComputeFontData(void* aStartStruct,
|
|
const nsRuleData* aRuleData,
|
|
nsStyleContext* aContext, nsRuleNode* aHighestNode,
|
|
RuleDetail aRuleDetail,
|
|
const mozilla::RuleNodeCacheConditions aConditions);
|
|
|
|
const void*
|
|
ComputeColorData(void* aStartStruct,
|
|
const nsRuleData* aRuleData,
|
|
nsStyleContext* aContext, nsRuleNode* aHighestNode,
|
|
RuleDetail aRuleDetail,
|
|
const mozilla::RuleNodeCacheConditions aConditions);
|
|
|
|
const void*
|
|
ComputeBackgroundData(void* aStartStruct,
|
|
const nsRuleData* aRuleData,
|
|
nsStyleContext* aContext, nsRuleNode* aHighestNode,
|
|
RuleDetail aRuleDetail,
|
|
const mozilla::RuleNodeCacheConditions aConditions);
|
|
|
|
const void*
|
|
ComputeMarginData(void* aStartStruct,
|
|
const nsRuleData* aRuleData,
|
|
nsStyleContext* aContext, nsRuleNode* aHighestNode,
|
|
RuleDetail aRuleDetail,
|
|
const mozilla::RuleNodeCacheConditions aConditions);
|
|
|
|
const void*
|
|
ComputeBorderData(void* aStartStruct,
|
|
const nsRuleData* aRuleData,
|
|
nsStyleContext* aContext, nsRuleNode* aHighestNode,
|
|
RuleDetail aRuleDetail,
|
|
const mozilla::RuleNodeCacheConditions aConditions);
|
|
|
|
const void*
|
|
ComputePaddingData(void* aStartStruct,
|
|
const nsRuleData* aRuleData,
|
|
nsStyleContext* aContext, nsRuleNode* aHighestNode,
|
|
RuleDetail aRuleDetail,
|
|
const mozilla::RuleNodeCacheConditions aConditions);
|
|
|
|
const void*
|
|
ComputeOutlineData(void* aStartStruct,
|
|
const nsRuleData* aRuleData,
|
|
nsStyleContext* aContext, nsRuleNode* aHighestNode,
|
|
RuleDetail aRuleDetail,
|
|
const mozilla::RuleNodeCacheConditions aConditions);
|
|
|
|
const void*
|
|
ComputeListData(void* aStartStruct,
|
|
const nsRuleData* aRuleData,
|
|
nsStyleContext* aContext, nsRuleNode* aHighestNode,
|
|
RuleDetail aRuleDetail,
|
|
const mozilla::RuleNodeCacheConditions aConditions);
|
|
|
|
const void*
|
|
ComputePositionData(void* aStartStruct,
|
|
const nsRuleData* aRuleData,
|
|
nsStyleContext* aContext, nsRuleNode* aHighestNode,
|
|
RuleDetail aRuleDetail,
|
|
const mozilla::RuleNodeCacheConditions aConditions);
|
|
|
|
const void*
|
|
ComputeTableData(void* aStartStruct,
|
|
const nsRuleData* aRuleData,
|
|
nsStyleContext* aContext, nsRuleNode* aHighestNode,
|
|
RuleDetail aRuleDetail,
|
|
const mozilla::RuleNodeCacheConditions aConditions);
|
|
|
|
const void*
|
|
ComputeTableBorderData(void* aStartStruct,
|
|
const nsRuleData* aRuleData,
|
|
nsStyleContext* aContext, nsRuleNode* aHighestNode,
|
|
RuleDetail aRuleDetail,
|
|
const mozilla::RuleNodeCacheConditions aConditions);
|
|
|
|
const void*
|
|
ComputeContentData(void* aStartStruct,
|
|
const nsRuleData* aRuleData,
|
|
nsStyleContext* aContext, nsRuleNode* aHighestNode,
|
|
RuleDetail aRuleDetail,
|
|
const mozilla::RuleNodeCacheConditions aConditions);
|
|
|
|
const void*
|
|
ComputeTextData(void* aStartStruct,
|
|
const nsRuleData* aRuleData,
|
|
nsStyleContext* aContext, nsRuleNode* aHighestNode,
|
|
RuleDetail aRuleDetail,
|
|
const mozilla::RuleNodeCacheConditions aConditions);
|
|
|
|
const void*
|
|
ComputeTextResetData(void* aStartStruct,
|
|
const nsRuleData* aRuleData,
|
|
nsStyleContext* aContext, nsRuleNode* aHighestNode,
|
|
RuleDetail aRuleDetail,
|
|
const mozilla::RuleNodeCacheConditions aConditions);
|
|
|
|
const void*
|
|
ComputeUserInterfaceData(void* aStartStruct,
|
|
const nsRuleData* aRuleData,
|
|
nsStyleContext* aContext,
|
|
nsRuleNode* aHighestNode,
|
|
RuleDetail aRuleDetail,
|
|
const mozilla::RuleNodeCacheConditions aConditions);
|
|
|
|
const void*
|
|
ComputeUIResetData(void* aStartStruct,
|
|
const nsRuleData* aRuleData,
|
|
nsStyleContext* aContext, nsRuleNode* aHighestNode,
|
|
RuleDetail aRuleDetail,
|
|
const mozilla::RuleNodeCacheConditions aConditions);
|
|
|
|
const void*
|
|
ComputeXULData(void* aStartStruct,
|
|
const nsRuleData* aRuleData,
|
|
nsStyleContext* aContext, nsRuleNode* aHighestNode,
|
|
RuleDetail aRuleDetail,
|
|
const mozilla::RuleNodeCacheConditions aConditions);
|
|
|
|
const void*
|
|
ComputeColumnData(void* aStartStruct,
|
|
const nsRuleData* aRuleData,
|
|
nsStyleContext* aContext, nsRuleNode* aHighestNode,
|
|
RuleDetail aRuleDetail,
|
|
const mozilla::RuleNodeCacheConditions aConditions);
|
|
|
|
const void*
|
|
ComputeSVGData(void* aStartStruct,
|
|
const nsRuleData* aRuleData,
|
|
nsStyleContext* aContext, nsRuleNode* aHighestNode,
|
|
RuleDetail aRuleDetail,
|
|
const mozilla::RuleNodeCacheConditions aConditions);
|
|
|
|
const void*
|
|
ComputeSVGResetData(void* aStartStruct,
|
|
const nsRuleData* aRuleData,
|
|
nsStyleContext* aContext, nsRuleNode* aHighestNode,
|
|
RuleDetail aRuleDetail,
|
|
const mozilla::RuleNodeCacheConditions aConditions);
|
|
|
|
const void*
|
|
ComputeVariablesData(void* aStartStruct,
|
|
const nsRuleData* aRuleData,
|
|
nsStyleContext* aContext, nsRuleNode* aHighestNode,
|
|
RuleDetail aRuleDetail,
|
|
const mozilla::RuleNodeCacheConditions aConditions);
|
|
|
|
const void*
|
|
ComputeEffectsData(void* aStartStruct,
|
|
const nsRuleData* aRuleData,
|
|
nsStyleContext* aContext, nsRuleNode* aHighestNode,
|
|
RuleDetail aRuleDetail,
|
|
const mozilla::RuleNodeCacheConditions aConditions);
|
|
|
|
// helpers for |ComputeFontData| that need access to |mNoneBits|:
|
|
static void SetFontSize(nsPresContext* aPresContext,
|
|
nsStyleContext* aContext,
|
|
const nsRuleData* aRuleData,
|
|
const nsStyleFont* aFont,
|
|
const nsStyleFont* aParentFont,
|
|
nscoord* aSize,
|
|
const nsFont& aSystemFont,
|
|
nscoord aParentSize,
|
|
nscoord aScriptLevelAdjustedParentSize,
|
|
bool aUsedStartStruct,
|
|
bool aAtRoot,
|
|
mozilla::RuleNodeCacheConditions& aConditions);
|
|
|
|
static void SetFont(nsPresContext* aPresContext,
|
|
nsStyleContext* aContext,
|
|
uint8_t aGenericFontID,
|
|
const nsRuleData* aRuleData,
|
|
const nsStyleFont* aParentFont,
|
|
nsStyleFont* aFont,
|
|
bool aStartStruct,
|
|
mozilla::RuleNodeCacheConditions& aConditions);
|
|
|
|
static void SetGenericFont(nsPresContext* aPresContext,
|
|
nsStyleContext* aContext,
|
|
uint8_t aGenericFontID,
|
|
nsStyleFont* aFont);
|
|
|
|
inline RuleDetail CheckSpecifiedProperties(const nsStyleStructID aSID,
|
|
const nsRuleData* aRuleData);
|
|
|
|
private:
|
|
nsRuleNode(nsPresContext* aPresContext, nsRuleNode* aParent,
|
|
nsIStyleRule* aRule, mozilla::SheetType aLevel, bool aIsImportant);
|
|
~nsRuleNode();
|
|
|
|
public:
|
|
// This is infallible; it will never return nullptr.
|
|
static already_AddRefed<nsRuleNode> CreateRootNode(nsPresContext* aPresContext);
|
|
|
|
static void EnsureBlockDisplay(mozilla::StyleDisplay& display,
|
|
bool aConvertListItem = false);
|
|
static void EnsureInlineDisplay(mozilla::StyleDisplay& display);
|
|
|
|
// Transition never returns null; on out of memory it'll just return |this|.
|
|
nsRuleNode* Transition(nsIStyleRule* aRule, mozilla::SheetType aLevel,
|
|
bool aIsImportantRule);
|
|
nsRuleNode* GetParent() const { return mParent; }
|
|
bool IsRoot() const { return mParent == nullptr; }
|
|
|
|
// Return the root of the rule tree that this rule node is in.
|
|
nsRuleNode* RuleTree();
|
|
const nsRuleNode* RuleTree() const {
|
|
return const_cast<nsRuleNode*>(this)->RuleTree();
|
|
}
|
|
|
|
mozilla::SheetType GetLevel() const {
|
|
NS_ASSERTION(!IsRoot(), "can't call on root");
|
|
return mozilla::SheetType(
|
|
(mDependentBits & NS_RULE_NODE_LEVEL_MASK) >>
|
|
NS_RULE_NODE_LEVEL_SHIFT);
|
|
}
|
|
bool IsImportantRule() const {
|
|
NS_ASSERTION(!IsRoot(), "can't call on root");
|
|
return (mDependentBits & NS_RULE_NODE_IS_IMPORTANT) != 0;
|
|
}
|
|
|
|
/**
|
|
* Has this rule node at some time in its lifetime been the mRuleNode
|
|
* of some style context (as opposed to only being the ancestor of
|
|
* some style context's mRuleNode)?
|
|
*/
|
|
void SetUsedDirectly();
|
|
bool IsUsedDirectly() const {
|
|
return (mDependentBits & NS_RULE_NODE_USED_DIRECTLY) != 0;
|
|
}
|
|
|
|
/**
|
|
* Is the mRule of this rule node an AnimValuesStyleRule?
|
|
*/
|
|
void SetIsAnimationRule() {
|
|
MOZ_ASSERT(!HaveChildren() ||
|
|
(mDependentBits & NS_RULE_NODE_IS_ANIMATION_RULE),
|
|
"SetIsAnimationRule must only set the IS_ANIMATION_RULE bit "
|
|
"before the rule node has children");
|
|
mDependentBits |= NS_RULE_NODE_IS_ANIMATION_RULE;
|
|
mNoneBits |= NS_RULE_NODE_HAS_ANIMATION_DATA;
|
|
}
|
|
bool IsAnimationRule() const {
|
|
return (mDependentBits & NS_RULE_NODE_IS_ANIMATION_RULE) != 0;
|
|
}
|
|
|
|
/**
|
|
* Is the mRule of this rule node or any of its ancestors an
|
|
* AnimValuesStyleRule?
|
|
*/
|
|
bool HasAnimationData() const {
|
|
return (mNoneBits & NS_RULE_NODE_HAS_ANIMATION_DATA) != 0;
|
|
}
|
|
|
|
// NOTE: Does not |AddRef|. Null only for the root.
|
|
nsIStyleRule* GetRule() const { return mRule; }
|
|
// NOTE: Does not |AddRef|. Never null.
|
|
nsPresContext* PresContext() const { return mPresContext; }
|
|
|
|
const void* GetStyleData(nsStyleStructID aSID,
|
|
nsStyleContext* aContext,
|
|
bool aComputeData);
|
|
|
|
void GetDiscretelyAnimatedCSSValue(nsCSSPropertyID aProperty,
|
|
nsCSSValue* aValue);
|
|
|
|
// See comments in GetStyleData for an explanation of what the
|
|
// code below does.
|
|
#define STYLE_STRUCT_INHERITED(name_, checkdata_cb_) \
|
|
template<bool aComputeData> \
|
|
const nsStyle##name_* \
|
|
GetStyle##name_(nsStyleContext* aContext, uint64_t& aContextStyleBits) \
|
|
{ \
|
|
NS_ASSERTION(IsUsedDirectly(), \
|
|
"if we ever call this on rule nodes that aren't used " \
|
|
"directly, we should adjust handling of mDependentBits " \
|
|
"in some way."); \
|
|
MOZ_ASSERT(!ContextHasCachedData(aContext, eStyleStruct_##name_), \
|
|
"style context should not have cached data for struct"); \
|
|
\
|
|
const nsStyle##name_ *data; \
|
|
\
|
|
/* Never use cached data for animated style inside a pseudo-element; */ \
|
|
/* see comment on cacheability in AnimValuesStyleRule::MapRuleInfoInto */ \
|
|
if (!(HasAnimationData() && ParentHasPseudoElementData(aContext))) { \
|
|
data = mStyleData.GetStyle##name_(); \
|
|
if (data != nullptr) { \
|
|
/* For inherited structs, mark the struct (which will be set on */ \
|
|
/* the context by our caller) as not being owned by the context. */ \
|
|
/* Normally this would be aContext->AddStyleBit(), but aContext is */ \
|
|
/* an incomplete type here, so we work around that with a param. */ \
|
|
aContextStyleBits |= NS_STYLE_INHERIT_BIT(name_); \
|
|
/* Our caller will cache the data on the style context. */ \
|
|
return data; \
|
|
} \
|
|
} \
|
|
\
|
|
if (!aComputeData) \
|
|
return nullptr; \
|
|
\
|
|
data = static_cast<const nsStyle##name_ *> \
|
|
(WalkRuleTree(eStyleStruct_##name_, aContext)); \
|
|
\
|
|
MOZ_ASSERT(data, "should have aborted on out-of-memory"); \
|
|
return data; \
|
|
}
|
|
|
|
#define STYLE_STRUCT_RESET(name_, checkdata_cb_) \
|
|
template<bool aComputeData> \
|
|
const nsStyle##name_* \
|
|
GetStyle##name_(nsStyleContext* aContext) \
|
|
{ \
|
|
NS_ASSERTION(IsUsedDirectly(), \
|
|
"if we ever call this on rule nodes that aren't used " \
|
|
"directly, we should adjust handling of mDependentBits " \
|
|
"in some way."); \
|
|
MOZ_ASSERT(!ContextHasCachedData(aContext, eStyleStruct_##name_), \
|
|
"style context should not have cached data for struct"); \
|
|
\
|
|
const nsStyle##name_ *data; \
|
|
\
|
|
/* Never use cached data for animated style inside a pseudo-element; */ \
|
|
/* see comment on cacheability in AnimValuesStyleRule::MapRuleInfoInto */ \
|
|
if (!(HasAnimationData() && ParentHasPseudoElementData(aContext))) { \
|
|
data = mStyleData.GetStyle##name_(aContext, aComputeData); \
|
|
if (MOZ_LIKELY(data != nullptr)) { \
|
|
if (HasAnimationData()) { \
|
|
/* If we have animation data, the struct should be cached on the */ \
|
|
/* style context so that we can peek the struct. */ \
|
|
/* See comment in AnimValuesStyleRule::MapRuleInfoInto. */ \
|
|
StoreStyleOnContext(aContext, \
|
|
eStyleStruct_##name_, \
|
|
const_cast<nsStyle##name_*>(data)); \
|
|
} \
|
|
return data; \
|
|
} \
|
|
} \
|
|
\
|
|
if (!aComputeData) \
|
|
return nullptr; \
|
|
\
|
|
data = static_cast<const nsStyle##name_ *> \
|
|
(WalkRuleTree(eStyleStruct_##name_, aContext)); \
|
|
\
|
|
MOZ_ASSERT(data, "should have aborted on out-of-memory"); \
|
|
return data; \
|
|
}
|
|
|
|
#include "nsStyleStructList.h"
|
|
|
|
#undef STYLE_STRUCT_RESET
|
|
#undef STYLE_STRUCT_INHERITED
|
|
|
|
static bool
|
|
HasAuthorSpecifiedRules(nsStyleContext* aStyleContext,
|
|
uint32_t ruleTypeMask,
|
|
bool aAuthorColorsAllowed);
|
|
|
|
/**
|
|
* Fill in to aPropertiesOverridden all of the properties in aProperties
|
|
* that, for this rule node, have a declaration that is higher than the
|
|
* animation level in the CSS Cascade.
|
|
*/
|
|
static void
|
|
ComputePropertiesOverridingAnimation(
|
|
const nsTArray<nsCSSPropertyID>& aProperties,
|
|
nsStyleContext* aStyleContext,
|
|
nsCSSPropertyIDSet& aPropertiesOverridden);
|
|
|
|
// 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,
|
|
mozilla::RuleNodeCacheConditions& aConditions);
|
|
|
|
struct ComputedCalc {
|
|
nscoord mLength;
|
|
float mPercent;
|
|
|
|
ComputedCalc(nscoord aLength, float aPercent)
|
|
: mLength(aLength), mPercent(aPercent) {}
|
|
};
|
|
static ComputedCalc
|
|
SpecifiedCalcToComputedCalc(const nsCSSValue& aValue,
|
|
nsStyleContext* aStyleContext,
|
|
nsPresContext* aPresContext,
|
|
mozilla::RuleNodeCacheConditions& aConditions);
|
|
|
|
// Compute the value of an nsStyleCoord that IsCalcUnit().
|
|
// (Values that don't require aPercentageBasis should be handled
|
|
// inside nsRuleNode rather than through this API.)
|
|
// @note the caller is expected to handle percentage of an indefinite size
|
|
// and NOT call this method with aPercentageBasis == NS_UNCONSTRAINEDSIZE.
|
|
// @note the return value may be negative, e.g. for "calc(a - b%)"
|
|
static nscoord ComputeComputedCalc(const nsStyleCoord& aCoord,
|
|
nscoord aPercentageBasis);
|
|
|
|
// Compute the value of an nsStyleCoord that is either a coord, a
|
|
// percent, or a calc expression.
|
|
// @note the caller is expected to handle percentage of an indefinite size
|
|
// and NOT call this method with aPercentageBasis == NS_UNCONSTRAINEDSIZE.
|
|
// @note the return value may be negative, e.g. for "calc(a - b%)"
|
|
static nscoord ComputeCoordPercentCalc(const nsStyleCoord& aCoord,
|
|
nscoord aPercentageBasis);
|
|
|
|
// 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.
|
|
bool TreeHasCachedData() const {
|
|
NS_ASSERTION(IsRoot(), "should only be called on root of rule tree");
|
|
return HaveChildren() || mStyleData.mInheritedData || mStyleData.mResetData;
|
|
}
|
|
|
|
// Note that this will return false if we have cached conditional
|
|
// style structs.
|
|
bool NodeHasCachedUnconditionalData(const nsStyleStructID aSID) {
|
|
return !!mStyleData.GetStyleData(aSID);
|
|
}
|
|
|
|
static void ComputeFontFeatures(const nsCSSValuePairList* aFeaturesList,
|
|
nsTArray<gfxFontFeature>& aFeatureSettings);
|
|
|
|
static void ComputeFontVariations(const nsCSSValuePairList* aVariationsList,
|
|
nsTArray<gfxFontVariation>& aVariationSettings);
|
|
|
|
static nscoord CalcFontPointSize(int32_t aHTMLSize, int32_t aBasePointSize,
|
|
nsPresContext* aPresContext,
|
|
nsFontSizeType aFontSizeType = eFontSize_HTML);
|
|
|
|
static nscoord FindNextSmallerFontSize(nscoord aFontSize, int32_t aBasePointSize,
|
|
nsPresContext* aPresContext,
|
|
nsFontSizeType aFontSizeType = eFontSize_HTML);
|
|
|
|
static nscoord FindNextLargerFontSize(nscoord aFontSize, int32_t aBasePointSize,
|
|
nsPresContext* aPresContext,
|
|
nsFontSizeType aFontSizeType = eFontSize_HTML);
|
|
|
|
/**
|
|
* @param aValue The color value, returned from nsCSSParser::ParseColorString
|
|
* @param aPresContext Presentation context whose preferences are used
|
|
* for certain enumerated colors
|
|
* @param aStyleContext Style context whose color is used for 'currentColor'
|
|
*
|
|
* @note aPresContext and aStyleContext may be null, but in that case, fully
|
|
* opaque black will be returned for the values that rely on these
|
|
* objects to compute the color. (For example, -moz-hyperlinktext.)
|
|
*
|
|
* @return false if we fail to extract a color; this will not happen if both
|
|
* aPresContext and aStyleContext are non-null
|
|
*/
|
|
static bool ComputeColor(const nsCSSValue& aValue,
|
|
nsPresContext* aPresContext,
|
|
nsStyleContext* aStyleContext,
|
|
nscolor& aResult);
|
|
|
|
static bool ParentHasPseudoElementData(nsStyleContext* aContext);
|
|
|
|
static void ComputeTimingFunction(const nsCSSValue& aValue,
|
|
nsTimingFunction& aResult);
|
|
|
|
// Fill unspecified layers by cycling through their values
|
|
// till they all are of length aMaxItemCount
|
|
static void FillAllBackgroundLists(nsStyleImageLayers& aLayers,
|
|
uint32_t aMaxItemCount);
|
|
|
|
static void FillAllMaskLists(nsStyleImageLayers& aLayers,
|
|
uint32_t aMaxItemCount);
|
|
|
|
private:
|
|
#ifdef DEBUG
|
|
// non-inline helper function to allow assertions without incomplete
|
|
// type errors
|
|
bool ContextHasCachedData(nsStyleContext* aContext, nsStyleStructID aSID);
|
|
#endif
|
|
|
|
// Store style struct on the style context and tell the style context
|
|
// that it doesn't own the data
|
|
static void StoreStyleOnContext(nsStyleContext* aContext,
|
|
nsStyleStructID aSID,
|
|
void* aStruct);
|
|
};
|
|
|
|
/**
|
|
* We allocate arrays of CSS values with alloca. (These arrays are a
|
|
* fixed size per style struct, but we don't want to waste the
|
|
* allocation and construction/destruction costs of the big structs when
|
|
* we're handling much smaller ones.) Since the lifetime of an alloca
|
|
* allocation is the life of the calling function, the caller must call
|
|
* alloca. However, to ensure that constructors and destructors are
|
|
* balanced, we do the constructor and destructor calling from this RAII
|
|
* class, AutoCSSValueArray.
|
|
*/
|
|
struct AutoCSSValueArray
|
|
{
|
|
/**
|
|
* aStorage must be the result of alloca(aCount * sizeof(nsCSSValue))
|
|
*/
|
|
AutoCSSValueArray(void* aStorage, size_t aCount);
|
|
|
|
~AutoCSSValueArray();
|
|
|
|
nsCSSValue* get() { return mArray; }
|
|
|
|
private:
|
|
nsCSSValue *mArray;
|
|
size_t mCount;
|
|
};
|
|
|
|
#endif
|