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gecko-dev/layout/style/nsCSSDataBlock.cpp

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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/Maybe.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/WritingModes.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;
}
/**
* This function maps "-webkit-box-orient" values to "flex-direction" values,
* for a given writing-mode (taken from aRuleData).
*
* Specifically:
* - If aBoxOrientVal is an enumerated value (representing a physical axis),
* then we'll map it to the appropriate logical "flex-direction" value, using
* the writing mode. The converted value will be emplace()'d into in the
* outparam aConvertedValStorage, and we'll return a pointer to that value.
* - Otherwise (e.g. if we have "inherit" or "initial"), we won't do any
* mapping, and we'll directly return the passed-in aBoxOrientVal.
*
* Either way, the idea is that our caller can treat the returned value as if
* it were a value for "flex-direction".
*/
static const nsCSSValue*
ConvertBoxOrientToFlexDirection(const nsCSSValue* aBoxOrientVal,
const nsRuleData* aRuleData,
Maybe<nsCSSValue>& aConvertedValStorage)
{
MOZ_ASSERT(aBoxOrientVal, "expecting a non-null value to convert");
MOZ_ASSERT(aConvertedValStorage.isNothing(),
"expecting outparam for converted-value to be initially empty");
if (aBoxOrientVal->GetUnit() != eCSSUnit_Enumerated) {
// We probably have "inherit" or "initial" -- just return that & have the
// caller directly use it as a "flex-direction" value.
return aBoxOrientVal;
}
// OK, we have an enumerated value -- "horizontal" or "vertical".
WritingMode wm(aRuleData->mStyleContext);
// In a horizontal writing-mode, "horizontal" maps to "row".
// In a vertical writing-mode, "horizontal" maps to "column".
bool isRow = wm.IsVertical() !=
(aBoxOrientVal->GetIntValue() == NS_STYLE_BOX_ORIENT_HORIZONTAL);
aConvertedValStorage.emplace(isRow ? NS_STYLE_FLEX_DIRECTION_ROW :
NS_STYLE_FLEX_DIRECTION_COLUMN,
eCSSUnit_Enumerated);
return aConvertedValStorage.ptr();
}
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, nsCSSProperty aProperty,
bool aForTokenStream)
{
MOZ_ASSERT(aDocument);
if (aValue.GetUnit() == eCSSUnit_URL) {
aValue.StartImageLoad(aDocument);
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, nsCSSProperty 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, nsCSSProperty 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(nsCSSProperty aSrcProp,
const nsCSSValue* aSrcValue,
nsCSSProperty aTargetProp,
nsCSSValue* aTargetValue,
nsRuleData* aRuleData)
{
MOZ_ASSERT(!nsCSSProps::PropHasFlags(aTargetProp, CSS_PROPERTY_LOGICAL),
"Can't map into a logical property");
MOZ_ASSERT(aSrcProp == aTargetProp ||
nsCSSProps::PropHasFlags(aSrcProp, CSS_PROPERTY_LOGICAL),
"Source & target property must be the same, except when we're "
"doing a logical-to-physical property mapping");
MOZ_ASSERT(aSrcValue->GetUnit() != eCSSUnit_Null, "oops");
// Handle logical properties that have custom value-mapping behavior:
Maybe<nsCSSValue> convertedVal; // storage for converted value, if needed
bool hasCustomValMapping =
nsCSSProps::PropHasFlags(aSrcProp,
CSS_PROPERTY_LOGICAL_SINGLE_CUSTOM_VALMAPPING);
if (hasCustomValMapping) {
if (aSrcProp == eCSSProperty_webkit_box_orient) {
aSrcValue = ConvertBoxOrientToFlexDirection(aSrcValue, aRuleData,
convertedVal);
}
}
// 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, returns the equivalent physical
* property based on writing mode information obtained from aRuleData's
* style context.
*/
static inline nsCSSProperty
EnsurePhysicalProperty(nsCSSProperty aProperty, nsRuleData* aRuleData)
{
if (!nsCSSProps::PropHasFlags(aProperty, CSS_PROPERTY_LOGICAL)) {
return aProperty;
}
bool isSingleProperty =
nsCSSProps::PropHasFlags(aProperty,
CSS_PROPERTY_LOGICAL_SINGLE_CUSTOM_VALMAPPING);
bool isAxisProperty =
nsCSSProps::PropHasFlags(aProperty, CSS_PROPERTY_LOGICAL_AXIS);
bool isBlock =
nsCSSProps::PropHasFlags(aProperty, CSS_PROPERTY_LOGICAL_BLOCK_AXIS);
int index;
if (isSingleProperty) {
index = 0; // We always map to the same physical property.
} else 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::css::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(NS_SIDE_TOP == 0 && NS_SIDE_RIGHT == 1 &&
NS_SIDE_BOTTOM == 2 && NS_SIDE_LEFT == 3,
"unexpected side constant values");
index = side;
}
const nsCSSProperty* props = nsCSSProps::LogicalGroup(aProperty);
#ifdef DEBUG
{
// Table-length is 1 for single prop, 2 for axis prop, 4 for block prop.
size_t len = isSingleProperty ? 1 : (isAxisProperty ? 2 : 4);
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
return 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; ) {
nsCSSProperty iProp = PropertyAtIndex(i);
if (nsCachedStyleData::GetBitForSID(nsCSSProps::kSIDTable[iProp]) &
aRuleData->mSIDs) {
nsCSSProperty physicalProp = EnsurePhysicalProperty(iProp,
aRuleData);
if (physicalProp != iProp) {
// We can't cache anything on the rule tree if we use any data from
// the style context, since data cached in the rule tree could be
// used with a style context with a different value.
uint8_t wm = WritingMode(aRuleData->mStyleContext).GetBits();
aRuleData->mConditions.SetWritingModeDependency(wm);
}
nsCSSValue* target = aRuleData->ValueFor(physicalProp);
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, physicalProp, target,
aRuleData);
}
}
}
}
const nsCSSValue*
nsCSSCompressedDataBlock::ValueFor(nsCSSProperty 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(nsCSSProperty 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<nsCSSValue*>(oldValue));
aFromBlock.ClearPropertyBit(aProperty);
return true;
}
nsCSSCompressedDataBlock*
nsCSSCompressedDataBlock::Clone() const
{
nsAutoPtr<nsCSSCompressedDataBlock>
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(NS_STYLE_BORDER_IMAGE_REPEAT_STRETCH, eCSSUnit_Enumerated));
}
/*****************************************************************************/
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++) {
nsCSSProperty 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 < nsCSSPropertySet::kChunkCount; ++iHigh) {
if (!mPropertiesSet.HasPropertyInChunk(iHigh))
continue;
for (size_t iLow = 0; iLow < nsCSSPropertySet::kBitsInChunk; ++iLow) {
if (!mPropertiesSet.HasPropertyAt(iHigh, iLow))
continue;
#ifdef DEBUG
nsCSSProperty iProp = nsCSSPropertySet::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<uint32_t>& aOrder)
{
nsAutoPtr<nsCSSCompressedDataBlock> 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++) {
nsCSSProperty iProp = static_cast<nsCSSProperty>(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 < nsCSSPropertySet::kChunkCount; iHigh++) {
if (!mPropertiesSet.HasPropertyInChunk(iHigh)) {
continue;
}
for (size_t iLow = 0; iLow < nsCSSPropertySet::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(nsCSSProperty aProperty,
const nsCSSValue& aValue)
{
MOZ_ASSERT(!nsCSSProps::IsShorthand(aProperty),
"property out of range");
nsCSSValue& storage = *static_cast<nsCSSValue*>(PropertyAt(aProperty));
storage = aValue;
SetPropertyBit(aProperty);
}
void
nsCSSExpandedDataBlock::Clear()
{
for (size_t iHigh = 0; iHigh < nsCSSPropertySet::kChunkCount; ++iHigh) {
if (!mPropertiesSet.HasPropertyInChunk(iHigh))
continue;
for (size_t iLow = 0; iLow < nsCSSPropertySet::kBitsInChunk; ++iLow) {
if (!mPropertiesSet.HasPropertyAt(iHigh, iLow))
continue;
nsCSSProperty iProp = nsCSSPropertySet::CSSPropertyAt(iHigh, iLow);
ClearLonghandProperty(iProp);
}
}
AssertInitialState();
}
void
nsCSSExpandedDataBlock::ClearProperty(nsCSSProperty aPropID)
{
if (nsCSSProps::IsShorthand(aPropID)) {
CSSPROPS_FOR_SHORTHAND_SUBPROPERTIES(p, aPropID,
nsCSSProps::eIgnoreEnabledState) {
ClearLonghandProperty(*p);
}
} else {
ClearLonghandProperty(aPropID);
}
}
void
nsCSSExpandedDataBlock::ClearLonghandProperty(nsCSSProperty aPropID)
{
MOZ_ASSERT(!nsCSSProps::IsShorthand(aPropID), "out of range");
ClearPropertyBit(aPropID);
ClearImportantBit(aPropID);
PropertyAt(aPropID)->Reset();
}
bool
nsCSSExpandedDataBlock::TransferFromBlock(nsCSSExpandedDataBlock& aFromBlock,
nsCSSProperty aPropID,
nsCSSProps::EnabledState 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 eIgnoreEnabledState (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,
nsCSSProperty 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(nsCSSProperty aPropID,
nsRuleData* aRuleData) const
{
MOZ_ASSERT(!nsCSSProps::IsShorthand(aPropID));
const nsCSSValue* src = PropertyAt(aPropID);
MOZ_ASSERT(src->GetUnit() != eCSSUnit_Null);
nsCSSProperty physicalProp = EnsurePhysicalProperty(aPropID, aRuleData);
if (physicalProp != aPropID) {
uint8_t wm = WritingMode(aRuleData->mStyleContext).GetBits();
aRuleData->mConditions.SetWritingModeDependency(wm);
}
nsCSSValue* dest = aRuleData->ValueFor(physicalProp);
MOZ_ASSERT(dest->GetUnit() == eCSSUnit_TokenStream &&
dest->GetTokenStreamValue()->mPropertyID == aPropID);
CSSVariableImageTable::ReplaceAll(aRuleData->mStyleContext, aPropID, [=] {
MapSinglePropertyInto(aPropID, src, physicalProp, 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) {
nsCSSProperty prop = nsCSSProperty(i);
MOZ_ASSERT(PropertyAt(prop)->GetUnit() == eCSSUnit_Null,
"not initial state");
}
}
#endif
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