/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* vim: set ts=8 sts=2 et sw=2 tw=80: */ /* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ /* * compact representation of the property-value pairs within a CSS * declaration, and the code for expanding and compacting it */ #include "nsCSSDataBlock.h" #include "CSSVariableImageTable.h" #include "mozilla/css/Declaration.h" #include "mozilla/css/ImageLoader.h" #include "mozilla/CORSMode.h" #include "mozilla/MemoryReporting.h" #include "mozilla/WritingModes.h" #include "nsAutoPtr.h" #include "nsIDocument.h" #include "nsRuleData.h" #include "nsStyleContext.h" #include "nsStyleSet.h" using namespace mozilla; using namespace mozilla::css; /** * Does a fast move of aSource to aDest. The previous value in * aDest is cleanly destroyed, and aSource is cleared. Returns * true if, before the copy, the value at aSource compared unequal * to the value at aDest; false otherwise. */ static bool MoveValue(nsCSSValue* aSource, nsCSSValue* aDest) { bool changed = (*aSource != *aDest); aDest->~nsCSSValue(); memcpy(aDest, aSource, sizeof(nsCSSValue)); new (aSource) nsCSSValue(); return changed; } static bool ShouldIgnoreColors(nsRuleData *aRuleData) { return aRuleData->mLevel != SheetType::Agent && aRuleData->mLevel != SheetType::User && !aRuleData->mPresContext->UseDocumentColors(); } /** * Tries to call |nsCSSValue::StartImageLoad()| on an image source. * Image sources are specified by |url()| or |-moz-image-rect()| function. */ static void TryToStartImageLoadOnValue(const nsCSSValue& aValue, nsIDocument* aDocument, nsStyleContext* aContext, nsCSSPropertyID aProperty, bool aForTokenStream) { MOZ_ASSERT(aDocument); if (aValue.GetUnit() == eCSSUnit_URL) { // The 'mask-image' property accepts local reference URIs. // For example, // mask-image: url(#mask_id); // refer to a SVG mask element, whose id is // // "mask_id", in the current document. // For such 'mask-image' values (pointing to an in-document element), // there is no need to trigger image download. if (aProperty == eCSSProperty_mask_image) { // Filter out all fragment URLs. // Since nsCSSValue::GetURLStructValue runs much faster than // nsIURI::EqualsExceptRef bellow, we get performance gain by this // early return. URLValue* urlValue = aValue.GetURLStructValue(); if (urlValue->IsLocalRef()) { return; } // Even though urlValue is not a fragment URL, it might still refer to // an internal resource. // For example, aDocument base URL is "http://foo/index.html" and // intentionally references a mask-image at // url(http://foo/index.html#mask) which still refers to a resource in // aDocument. nsIURI* imageURI = aValue.GetURLValue(); if (imageURI) { nsIURI* docURI = aDocument->GetDocumentURI(); bool isEqualExceptRef = false; nsresult rv = imageURI->EqualsExceptRef(docURI, &isEqualExceptRef); if (NS_SUCCEEDED(rv) && isEqualExceptRef) { return; } } } CORSMode mode = nsCSSProps::PropHasFlags(aProperty, CSS_PROPERTY_LOAD_USE_CORS) ? CORSMode::CORS_ANONYMOUS : CORSMode::CORS_NONE; aValue.StartImageLoad(aDocument, mode); if (aForTokenStream && aContext) { CSSVariableImageTable::Add(aContext, aProperty, aValue.GetImageStructValue()); } } else if (aValue.GetUnit() == eCSSUnit_Image) { // If we already have a request, see if this document needs to clone it. imgIRequest* request = aValue.GetImageValue(nullptr); if (request) { ImageValue* imageValue = aValue.GetImageStructValue(); aDocument->StyleImageLoader()->MaybeRegisterCSSImage(imageValue); if (aForTokenStream && aContext) { CSSVariableImageTable::Add(aContext, aProperty, imageValue); } } } else if (aValue.EqualsFunction(eCSSKeyword__moz_image_rect)) { nsCSSValue::Array* arguments = aValue.GetArrayValue(); MOZ_ASSERT(arguments->Count() == 6, "unexpected num of arguments"); const nsCSSValue& image = arguments->Item(1); TryToStartImageLoadOnValue(image, aDocument, aContext, aProperty, aForTokenStream); } } static void TryToStartImageLoad(const nsCSSValue& aValue, nsIDocument* aDocument, nsStyleContext* aContext, nsCSSPropertyID aProperty, bool aForTokenStream) { if (aValue.GetUnit() == eCSSUnit_List) { for (const nsCSSValueList* l = aValue.GetListValue(); l; l = l->mNext) { TryToStartImageLoad(l->mValue, aDocument, aContext, aProperty, aForTokenStream); } } else if (nsCSSProps::PropHasFlags(aProperty, CSS_PROPERTY_IMAGE_IS_IN_ARRAY_0)) { if (aValue.GetUnit() == eCSSUnit_Array) { TryToStartImageLoadOnValue(aValue.GetArrayValue()->Item(0), aDocument, aContext, aProperty, aForTokenStream); } } else { TryToStartImageLoadOnValue(aValue, aDocument, aContext, aProperty, aForTokenStream); } } static inline bool ShouldStartImageLoads(nsRuleData *aRuleData, nsCSSPropertyID aProperty) { // Don't initiate image loads for if-visited styles. This is // important because: // (1) it's a waste of CPU and bandwidth // (2) in some cases we'd start the image load on a style change // where we wouldn't have started the load initially, which makes // which links are visited detectable to Web pages (see bug // 557287) return !aRuleData->mStyleContext->IsStyleIfVisited() && nsCSSProps::PropHasFlags(aProperty, CSS_PROPERTY_START_IMAGE_LOADS); } static void MapSinglePropertyInto(nsCSSPropertyID aTargetProp, const nsCSSValue* aSrcValue, nsCSSValue* aTargetValue, nsRuleData* aRuleData) { MOZ_ASSERT(!nsCSSProps::PropHasFlags(aTargetProp, CSS_PROPERTY_LOGICAL), "Can't map into a logical property"); MOZ_ASSERT(aSrcValue->GetUnit() != eCSSUnit_Null, "oops"); // Although aTargetValue is the nsCSSValue we are going to write into, // we also look at its value before writing into it. This is done // when aTargetValue is a token stream value, which is the case when we // have just re-parsed a property that had a variable reference (in // nsCSSParser::ParsePropertyWithVariableReferences). TryToStartImageLoad // then records any resulting ImageValue objects in the // CSSVariableImageTable, to give them the appropriate lifetime. MOZ_ASSERT(aTargetValue->GetUnit() == eCSSUnit_TokenStream || aTargetValue->GetUnit() == eCSSUnit_Null, "aTargetValue must only be a token stream (when re-parsing " "properties with variable references) or null"); if (ShouldStartImageLoads(aRuleData, aTargetProp)) { nsIDocument* doc = aRuleData->mPresContext->Document(); TryToStartImageLoad(*aSrcValue, doc, aRuleData->mStyleContext, aTargetProp, aTargetValue->GetUnit() == eCSSUnit_TokenStream); } *aTargetValue = *aSrcValue; if (nsCSSProps::PropHasFlags(aTargetProp, CSS_PROPERTY_IGNORED_WHEN_COLORS_DISABLED) && ShouldIgnoreColors(aRuleData)) { if (aTargetProp == eCSSProperty_background_color) { // Force non-'transparent' background // colors to the user's default. if (aTargetValue->IsNonTransparentColor()) { aTargetValue->SetColorValue(aRuleData->mPresContext-> DefaultBackgroundColor()); } } else { // Ignore 'color', 'border-*-color', etc. *aTargetValue = nsCSSValue(); } } } /** * If aProperty is a logical property, converts it to the equivalent physical * property based on writing mode information obtained from aRuleData's * style context. */ static inline void EnsurePhysicalProperty(nsCSSPropertyID& aProperty, nsRuleData* aRuleData) { bool isAxisProperty = nsCSSProps::PropHasFlags(aProperty, CSS_PROPERTY_LOGICAL_AXIS); bool isBlock = nsCSSProps::PropHasFlags(aProperty, CSS_PROPERTY_LOGICAL_BLOCK_AXIS); int index; if (isAxisProperty) { LogicalAxis logicalAxis = isBlock ? eLogicalAxisBlock : eLogicalAxisInline; uint8_t wm = aRuleData->mStyleContext->StyleVisibility()->mWritingMode; PhysicalAxis axis = WritingMode::PhysicalAxisForLogicalAxis(wm, logicalAxis); // We rely on physical axis constants values matching the order of the // physical properties in the logical group array. static_assert(eAxisVertical == 0 && eAxisHorizontal == 1, "unexpected axis constant values"); index = axis; } else { bool isEnd = nsCSSProps::PropHasFlags(aProperty, CSS_PROPERTY_LOGICAL_END_EDGE); LogicalEdge edge = isEnd ? eLogicalEdgeEnd : eLogicalEdgeStart; // We handle block axis logical properties separately to save a bit of // work that the WritingMode constructor does that is unnecessary // unless we have an inline axis property. mozilla::Side side; if (isBlock) { uint8_t wm = aRuleData->mStyleContext->StyleVisibility()->mWritingMode; side = WritingMode::PhysicalSideForBlockAxis(wm, edge); } else { WritingMode wm(aRuleData->mStyleContext); side = wm.PhysicalSideForInlineAxis(edge); } // We rely on the physical side constant values matching the order of // the physical properties in the logical group array. static_assert(eSideTop == 0 && eSideRight == 1 && eSideBottom == 2 && eSideLeft == 3, "unexpected side constant values"); index = side; } const nsCSSPropertyID* props = nsCSSProps::LogicalGroup(aProperty); size_t len = isAxisProperty ? 2 : 4; #ifdef DEBUG for (size_t i = 0; i < len; i++) { MOZ_ASSERT(props[i] != eCSSProperty_UNKNOWN, "unexpected logical group length"); } MOZ_ASSERT(props[len] == eCSSProperty_UNKNOWN, "unexpected logical group length"); #endif for (size_t i = 0; i < len; i++) { if (aRuleData->ValueFor(props[i])->GetUnit() == eCSSUnit_Null) { // A declaration of one of the logical properties in this logical // group (but maybe not aProperty) would be the winning // declaration in the cascade. This means that it's reasonably // likely that this logical property could be the winning // declaration in the cascade for some values of writing-mode, // direction, and text-orientation. (It doesn't mean that for // sure, though. For example, if this is a block-start logical // property, and all but the bottom physical property were set. // But the common case we want to hit here is logical declarations // that are completely overridden by a shorthand.) // // If this logical property could be the winning declaration in // the cascade for some values of writing-mode, direction, and // text-orientation, then we have to fault the resulting style // struct out of the rule tree. We can't cache anything on the // rule tree if it depends on data from the style context, since // data cached in the rule tree could be used with a style context // with a different value of the depended-upon data. uint8_t wm = WritingMode(aRuleData->mStyleContext).GetBits(); aRuleData->mConditions.SetWritingModeDependency(wm); break; } } aProperty = props[index]; } void nsCSSCompressedDataBlock::MapRuleInfoInto(nsRuleData *aRuleData) const { // If we have no data for these structs, then return immediately. // This optimization should make us return most of the time, so we // have to worry much less (although still some) about the speed of // the rest of the function. if (!(aRuleData->mSIDs & mStyleBits)) return; // We process these in reverse order so that we end up mapping the // right property when one can be expressed using both logical and // physical property names. for (uint32_t i = mNumProps; i-- > 0; ) { nsCSSPropertyID iProp = PropertyAtIndex(i); if (nsCachedStyleData::GetBitForSID(nsCSSProps::kSIDTable[iProp]) & aRuleData->mSIDs) { if (nsCSSProps::PropHasFlags(iProp, CSS_PROPERTY_LOGICAL)) { EnsurePhysicalProperty(iProp, aRuleData); } nsCSSValue* target = aRuleData->ValueFor(iProp); if (target->GetUnit() == eCSSUnit_Null) { const nsCSSValue *val = ValueAtIndex(i); // In order for variable resolution to have the right information // about the stylesheet level of a value, that level needs to be // stored on the token stream. We can't do that at creation time // because the CSS parser (which creates the object) has no idea // about the stylesheet level, so we do it here instead, where // the rule walking will have just updated aRuleData. if (val->GetUnit() == eCSSUnit_TokenStream) { val->GetTokenStreamValue()->mLevel = aRuleData->mLevel; } MapSinglePropertyInto(iProp, val, target, aRuleData); } } } } const nsCSSValue* nsCSSCompressedDataBlock::ValueFor(nsCSSPropertyID aProperty) const { MOZ_ASSERT(!nsCSSProps::IsShorthand(aProperty), "Don't call for shorthands"); // If we have no data for this struct, then return immediately. // This optimization should make us return most of the time, so we // have to worry much less (although still some) about the speed of // the rest of the function. if (!(nsCachedStyleData::GetBitForSID(nsCSSProps::kSIDTable[aProperty]) & mStyleBits)) return nullptr; for (uint32_t i = 0; i < mNumProps; i++) { if (PropertyAtIndex(i) == aProperty) { return ValueAtIndex(i); } } return nullptr; } bool nsCSSCompressedDataBlock::TryReplaceValue(nsCSSPropertyID aProperty, nsCSSExpandedDataBlock& aFromBlock, bool *aChanged) { nsCSSValue* newValue = aFromBlock.PropertyAt(aProperty); MOZ_ASSERT(newValue && newValue->GetUnit() != eCSSUnit_Null, "cannot replace with empty value"); const nsCSSValue* oldValue = ValueFor(aProperty); if (!oldValue) { *aChanged = false; return false; } *aChanged = MoveValue(newValue, const_cast(oldValue)); aFromBlock.ClearPropertyBit(aProperty); return true; } nsCSSCompressedDataBlock* nsCSSCompressedDataBlock::Clone() const { nsAutoPtr result(new(mNumProps) nsCSSCompressedDataBlock(mNumProps)); result->mStyleBits = mStyleBits; for (uint32_t i = 0; i < mNumProps; i++) { result->SetPropertyAtIndex(i, PropertyAtIndex(i)); result->CopyValueToIndex(i, ValueAtIndex(i)); } return result.forget(); } nsCSSCompressedDataBlock::~nsCSSCompressedDataBlock() { for (uint32_t i = 0; i < mNumProps; i++) { #ifdef DEBUG (void)PropertyAtIndex(i); // this checks the property is in range #endif const nsCSSValue* val = ValueAtIndex(i); MOZ_ASSERT(val->GetUnit() != eCSSUnit_Null, "oops"); val->~nsCSSValue(); } } /* static */ nsCSSCompressedDataBlock* nsCSSCompressedDataBlock::CreateEmptyBlock() { nsCSSCompressedDataBlock *result = new(0) nsCSSCompressedDataBlock(0); return result; } size_t nsCSSCompressedDataBlock::SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const { size_t n = aMallocSizeOf(this); for (uint32_t i = 0; i < mNumProps; i++) { n += ValueAtIndex(i)->SizeOfExcludingThis(aMallocSizeOf); } return n; } bool nsCSSCompressedDataBlock::HasDefaultBorderImageSlice() const { const nsCSSValueList *slice = ValueFor(eCSSProperty_border_image_slice)->GetListValue(); return !slice->mNext && slice->mValue.GetRectValue().AllSidesEqualTo( nsCSSValue(1.0f, eCSSUnit_Percent)); } bool nsCSSCompressedDataBlock::HasDefaultBorderImageWidth() const { const nsCSSRect &width = ValueFor(eCSSProperty_border_image_width)->GetRectValue(); return width.AllSidesEqualTo(nsCSSValue(1.0f, eCSSUnit_Number)); } bool nsCSSCompressedDataBlock::HasDefaultBorderImageOutset() const { const nsCSSRect &outset = ValueFor(eCSSProperty_border_image_outset)->GetRectValue(); return outset.AllSidesEqualTo(nsCSSValue(0.0f, eCSSUnit_Number)); } bool nsCSSCompressedDataBlock::HasDefaultBorderImageRepeat() const { const nsCSSValuePair &repeat = ValueFor(eCSSProperty_border_image_repeat)->GetPairValue(); return repeat.BothValuesEqualTo(nsCSSValue(StyleBorderImageRepeat::Stretch)); } /*****************************************************************************/ nsCSSExpandedDataBlock::nsCSSExpandedDataBlock() { AssertInitialState(); } nsCSSExpandedDataBlock::~nsCSSExpandedDataBlock() { AssertInitialState(); } void nsCSSExpandedDataBlock::DoExpand(nsCSSCompressedDataBlock *aBlock, bool aImportant) { /* * Save needless copying and allocation by copying the memory * corresponding to the stored data in the compressed block. */ for (uint32_t i = 0; i < aBlock->mNumProps; i++) { nsCSSPropertyID iProp = aBlock->PropertyAtIndex(i); MOZ_ASSERT(!nsCSSProps::IsShorthand(iProp), "out of range"); MOZ_ASSERT(!HasPropertyBit(iProp), "compressed block has property multiple times"); SetPropertyBit(iProp); if (aImportant) SetImportantBit(iProp); const nsCSSValue* val = aBlock->ValueAtIndex(i); nsCSSValue* dest = PropertyAt(iProp); MOZ_ASSERT(val->GetUnit() != eCSSUnit_Null, "oops"); MOZ_ASSERT(dest->GetUnit() == eCSSUnit_Null, "expanding into non-empty block"); #ifdef NS_BUILD_REFCNT_LOGGING dest->~nsCSSValue(); #endif memcpy(dest, val, sizeof(nsCSSValue)); } // Set the number of properties to zero so that we don't destroy the // remnants of what we just copied. aBlock->SetNumPropsToZero(); delete aBlock; } void nsCSSExpandedDataBlock::Expand(nsCSSCompressedDataBlock *aNormalBlock, nsCSSCompressedDataBlock *aImportantBlock) { MOZ_ASSERT(aNormalBlock, "unexpected null block"); AssertInitialState(); DoExpand(aNormalBlock, false); if (aImportantBlock) { DoExpand(aImportantBlock, true); } } void nsCSSExpandedDataBlock::ComputeNumProps(uint32_t* aNumPropsNormal, uint32_t* aNumPropsImportant) { *aNumPropsNormal = *aNumPropsImportant = 0; for (size_t iHigh = 0; iHigh < nsCSSPropertyIDSet::kChunkCount; ++iHigh) { if (!mPropertiesSet.HasPropertyInChunk(iHigh)) continue; for (size_t iLow = 0; iLow < nsCSSPropertyIDSet::kBitsInChunk; ++iLow) { if (!mPropertiesSet.HasPropertyAt(iHigh, iLow)) continue; #ifdef DEBUG nsCSSPropertyID iProp = nsCSSPropertyIDSet::CSSPropertyAt(iHigh, iLow); #endif MOZ_ASSERT(!nsCSSProps::IsShorthand(iProp), "out of range"); MOZ_ASSERT(PropertyAt(iProp)->GetUnit() != eCSSUnit_Null, "null value while computing size"); if (mPropertiesImportant.HasPropertyAt(iHigh, iLow)) (*aNumPropsImportant)++; else (*aNumPropsNormal)++; } } } void nsCSSExpandedDataBlock::Compress(nsCSSCompressedDataBlock **aNormalBlock, nsCSSCompressedDataBlock **aImportantBlock, const nsTArray& aOrder) { nsAutoPtr result_normal, result_important; uint32_t i_normal = 0, i_important = 0; uint32_t numPropsNormal, numPropsImportant; ComputeNumProps(&numPropsNormal, &numPropsImportant); result_normal = new(numPropsNormal) nsCSSCompressedDataBlock(numPropsNormal); if (numPropsImportant != 0) { result_important = new(numPropsImportant) nsCSSCompressedDataBlock(numPropsImportant); } else { result_important = nullptr; } /* * Save needless copying and allocation by copying the memory * corresponding to the stored data in the expanded block, and then * clearing the data in the expanded block. */ for (size_t i = 0; i < aOrder.Length(); i++) { nsCSSPropertyID iProp = static_cast(aOrder[i]); if (iProp >= eCSSProperty_COUNT) { // a custom property continue; } MOZ_ASSERT(mPropertiesSet.HasProperty(iProp), "aOrder identifies a property not in the expanded " "data block"); MOZ_ASSERT(!nsCSSProps::IsShorthand(iProp), "out of range"); bool important = mPropertiesImportant.HasProperty(iProp); nsCSSCompressedDataBlock *result = important ? result_important : result_normal; uint32_t* ip = important ? &i_important : &i_normal; nsCSSValue* val = PropertyAt(iProp); MOZ_ASSERT(val->GetUnit() != eCSSUnit_Null, "Null value while compressing"); result->SetPropertyAtIndex(*ip, iProp); result->RawCopyValueToIndex(*ip, val); new (val) nsCSSValue(); (*ip)++; result->mStyleBits |= nsCachedStyleData::GetBitForSID(nsCSSProps::kSIDTable[iProp]); } MOZ_ASSERT(numPropsNormal == i_normal, "bad numProps"); if (result_important) { MOZ_ASSERT(numPropsImportant == i_important, "bad numProps"); } #ifdef DEBUG { // assert that we didn't have any other properties on this expanded data // block that we didn't find in aOrder uint32_t numPropsInSet = 0; for (size_t iHigh = 0; iHigh < nsCSSPropertyIDSet::kChunkCount; iHigh++) { if (!mPropertiesSet.HasPropertyInChunk(iHigh)) { continue; } for (size_t iLow = 0; iLow < nsCSSPropertyIDSet::kBitsInChunk; iLow++) { if (mPropertiesSet.HasPropertyAt(iHigh, iLow)) { numPropsInSet++; } } } MOZ_ASSERT(numPropsNormal + numPropsImportant == numPropsInSet, "aOrder missing properties from the expanded data block"); } #endif ClearSets(); AssertInitialState(); *aNormalBlock = result_normal.forget(); *aImportantBlock = result_important.forget(); } void nsCSSExpandedDataBlock::AddLonghandProperty(nsCSSPropertyID aProperty, const nsCSSValue& aValue) { MOZ_ASSERT(!nsCSSProps::IsShorthand(aProperty), "property out of range"); nsCSSValue& storage = *static_cast(PropertyAt(aProperty)); storage = aValue; SetPropertyBit(aProperty); } void nsCSSExpandedDataBlock::Clear() { for (size_t iHigh = 0; iHigh < nsCSSPropertyIDSet::kChunkCount; ++iHigh) { if (!mPropertiesSet.HasPropertyInChunk(iHigh)) continue; for (size_t iLow = 0; iLow < nsCSSPropertyIDSet::kBitsInChunk; ++iLow) { if (!mPropertiesSet.HasPropertyAt(iHigh, iLow)) continue; nsCSSPropertyID iProp = nsCSSPropertyIDSet::CSSPropertyAt(iHigh, iLow); ClearLonghandProperty(iProp); } } AssertInitialState(); } void nsCSSExpandedDataBlock::ClearProperty(nsCSSPropertyID aPropID) { if (nsCSSProps::IsShorthand(aPropID)) { CSSPROPS_FOR_SHORTHAND_SUBPROPERTIES( p, aPropID, CSSEnabledState::eIgnoreEnabledState) { ClearLonghandProperty(*p); } } else { ClearLonghandProperty(aPropID); } } void nsCSSExpandedDataBlock::ClearLonghandProperty(nsCSSPropertyID aPropID) { MOZ_ASSERT(!nsCSSProps::IsShorthand(aPropID), "out of range"); ClearPropertyBit(aPropID); ClearImportantBit(aPropID); PropertyAt(aPropID)->Reset(); } bool nsCSSExpandedDataBlock::TransferFromBlock(nsCSSExpandedDataBlock& aFromBlock, nsCSSPropertyID aPropID, CSSEnabledState aEnabledState, bool aIsImportant, bool aOverrideImportant, bool aMustCallValueAppended, css::Declaration* aDeclaration, nsIDocument* aSheetDocument) { if (!nsCSSProps::IsShorthand(aPropID)) { return DoTransferFromBlock(aFromBlock, aPropID, aIsImportant, aOverrideImportant, aMustCallValueAppended, aDeclaration, aSheetDocument); } // We can pass CSSEnabledState::eIgnore (here, and in ClearProperty // above) rather than a value corresponding to whether we're parsing // a UA style sheet or certified app because we assert in nsCSSProps:: // AddRefTable that shorthand properties available in these contexts // also have all of their subproperties available in these contexts. bool changed = false; CSSPROPS_FOR_SHORTHAND_SUBPROPERTIES(p, aPropID, aEnabledState) { changed |= DoTransferFromBlock(aFromBlock, *p, aIsImportant, aOverrideImportant, aMustCallValueAppended, aDeclaration, aSheetDocument); } return changed; } bool nsCSSExpandedDataBlock::DoTransferFromBlock(nsCSSExpandedDataBlock& aFromBlock, nsCSSPropertyID aPropID, bool aIsImportant, bool aOverrideImportant, bool aMustCallValueAppended, css::Declaration* aDeclaration, nsIDocument* aSheetDocument) { bool changed = false; MOZ_ASSERT(aFromBlock.HasPropertyBit(aPropID), "oops"); if (aIsImportant) { if (!HasImportantBit(aPropID)) changed = true; SetImportantBit(aPropID); } else { if (HasImportantBit(aPropID)) { // When parsing a declaration block, an !important declaration // is not overwritten by an ordinary declaration of the same // property later in the block. However, CSSOM manipulations // come through here too, and in that case we do want to // overwrite the property. if (!aOverrideImportant) { aFromBlock.ClearLonghandProperty(aPropID); return false; } changed = true; ClearImportantBit(aPropID); } } if (aMustCallValueAppended || !HasPropertyBit(aPropID)) { aDeclaration->ValueAppended(aPropID); } if (aSheetDocument) { UseCounter useCounter = nsCSSProps::UseCounterFor(aPropID); if (useCounter != eUseCounter_UNKNOWN) { aSheetDocument->SetDocumentAndPageUseCounter(useCounter); } } SetPropertyBit(aPropID); aFromBlock.ClearPropertyBit(aPropID); /* * Save needless copying and allocation by calling the destructor in * the destination, copying memory directly, and then using placement * new. */ changed |= MoveValue(aFromBlock.PropertyAt(aPropID), PropertyAt(aPropID)); return changed; } void nsCSSExpandedDataBlock::MapRuleInfoInto(nsCSSPropertyID aPropID, nsRuleData* aRuleData) const { MOZ_ASSERT(!nsCSSProps::IsShorthand(aPropID)); const nsCSSValue* src = PropertyAt(aPropID); MOZ_ASSERT(src->GetUnit() != eCSSUnit_Null); nsCSSPropertyID physicalProp = aPropID; if (nsCSSProps::PropHasFlags(aPropID, CSS_PROPERTY_LOGICAL)) { EnsurePhysicalProperty(physicalProp, aRuleData); } nsCSSValue* dest = aRuleData->ValueFor(physicalProp); MOZ_ASSERT(dest->GetUnit() == eCSSUnit_TokenStream && dest->GetTokenStreamValue()->mPropertyID == aPropID); CSSVariableImageTable::ReplaceAll(aRuleData->mStyleContext, aPropID, [=] { MapSinglePropertyInto(physicalProp, src, dest, aRuleData); }); } #ifdef DEBUG void nsCSSExpandedDataBlock::DoAssertInitialState() { mPropertiesSet.AssertIsEmpty("not initial state"); mPropertiesImportant.AssertIsEmpty("not initial state"); for (uint32_t i = 0; i < eCSSProperty_COUNT_no_shorthands; ++i) { nsCSSPropertyID prop = nsCSSPropertyID(i); MOZ_ASSERT(PropertyAt(prop)->GetUnit() == eCSSUnit_Null, "not initial state"); } } #endif