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0c9d4ac32b
We need to ensure we transfer (or clear) all subproperties of a shorthand that is only enabled in UA style sheets or in certified apps. Otherwise, the shorthand will parse correctly and get stored on the nsCSSExpandedDataBlock but the transfer (or clear) method will skip all of the subproperties.
359 lines
12 KiB
C++
359 lines
12 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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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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* compact representation of the property-value pairs within a CSS
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* declaration, and the code for expanding and compacting it
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*/
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#ifndef nsCSSDataBlock_h__
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#define nsCSSDataBlock_h__
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#include "mozilla/MemoryReporting.h"
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#include "nsCSSProps.h"
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#include "nsCSSPropertySet.h"
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#include "nsCSSValue.h"
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#include "imgRequestProxy.h"
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struct nsRuleData;
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class nsCSSExpandedDataBlock;
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namespace mozilla {
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namespace css {
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class Declaration;
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}
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}
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/**
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* An |nsCSSCompressedDataBlock| holds a usually-immutable chunk of
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* property-value data for a CSS declaration block (which we misname a
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* |css::Declaration|). Mutation is accomplished through
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* |nsCSSExpandedDataBlock| or in some cases via direct slot access.
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*/
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class nsCSSCompressedDataBlock {
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private:
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friend class nsCSSExpandedDataBlock;
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// Only this class (via |CreateEmptyBlock|) or nsCSSExpandedDataBlock
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// (in |Compress|) can create compressed data blocks.
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explicit nsCSSCompressedDataBlock(uint32_t aNumProps)
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: mStyleBits(0), mNumProps(aNumProps)
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{}
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public:
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~nsCSSCompressedDataBlock();
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/**
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* Do what |nsIStyleRule::MapRuleInfoInto| needs to do for a style
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* rule using this block for storage.
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*/
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void MapRuleInfoInto(nsRuleData *aRuleData) const;
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/**
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* Return the location at which the *value* for the property is
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* stored, or null if the block does not contain a value for the
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* property.
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*
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* Inefficient (by design).
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*
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* Must not be called for shorthands.
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*/
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const nsCSSValue* ValueFor(nsCSSProperty aProperty) const;
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/**
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* Attempt to replace the value for |aProperty| stored in this block
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* with the matching value stored in |aFromBlock|.
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* This method will fail (returning false) if |aProperty| is not
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* already in this block. It will set |aChanged| to true if it
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* actually made a change to the block, but regardless, if it
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* returns true, the value in |aFromBlock| was erased.
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*/
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bool TryReplaceValue(nsCSSProperty aProperty,
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nsCSSExpandedDataBlock& aFromBlock,
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bool* aChanged);
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/**
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* Clone this block, or return null on out-of-memory.
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*/
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nsCSSCompressedDataBlock* Clone() const;
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/**
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* Create a new nsCSSCompressedDataBlock holding no declarations.
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*/
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static nsCSSCompressedDataBlock* CreateEmptyBlock();
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size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
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bool HasDefaultBorderImageSlice() const;
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bool HasDefaultBorderImageWidth() const;
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bool HasDefaultBorderImageOutset() const;
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bool HasDefaultBorderImageRepeat() const;
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private:
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void* operator new(size_t aBaseSize, uint32_t aNumProps) {
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NS_ABORT_IF_FALSE(aBaseSize == sizeof(nsCSSCompressedDataBlock),
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"unexpected size for nsCSSCompressedDataBlock");
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return ::operator new(aBaseSize + DataSize(aNumProps));
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}
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public:
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// Ideally, |nsCSSProperty| would be |enum nsCSSProperty : int16_t|. But
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// not all of the compilers we use are modern enough to support small
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// enums. So we manually squeeze nsCSSProperty into 16 bits ourselves.
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// The static assertion below ensures it fits.
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typedef int16_t CompressedCSSProperty;
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static const size_t MaxCompressedCSSProperty = INT16_MAX;
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private:
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static size_t DataSize(uint32_t aNumProps) {
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return size_t(aNumProps) *
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(sizeof(nsCSSValue) + sizeof(CompressedCSSProperty));
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}
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int32_t mStyleBits; // the structs for which we have data, according to
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// |nsCachedStyleData::GetBitForSID|.
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uint32_t mNumProps;
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// nsCSSValue elements are stored after these fields, and
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// nsCSSProperty elements are stored -- each one compressed as a
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// CompressedCSSProperty -- after the nsCSSValue elements. Space for them
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// is allocated in |operator new| above. The static assertions following
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// this class make sure that the value and property elements are aligned
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// appropriately.
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nsCSSValue* Values() const {
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return (nsCSSValue*)(this + 1);
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}
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CompressedCSSProperty* CompressedProperties() const {
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return (CompressedCSSProperty*)(Values() + mNumProps);
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}
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nsCSSValue* ValueAtIndex(uint32_t i) const {
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NS_ABORT_IF_FALSE(i < mNumProps, "value index out of range");
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return Values() + i;
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}
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nsCSSProperty PropertyAtIndex(uint32_t i) const {
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NS_ABORT_IF_FALSE(i < mNumProps, "property index out of range");
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nsCSSProperty prop = (nsCSSProperty)CompressedProperties()[i];
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NS_ABORT_IF_FALSE(!nsCSSProps::IsShorthand(prop), "out of range");
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return prop;
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}
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void CopyValueToIndex(uint32_t i, nsCSSValue* aValue) {
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new (ValueAtIndex(i)) nsCSSValue(*aValue);
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}
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void RawCopyValueToIndex(uint32_t i, nsCSSValue* aValue) {
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memcpy(ValueAtIndex(i), aValue, sizeof(nsCSSValue));
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}
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void SetPropertyAtIndex(uint32_t i, nsCSSProperty aProperty) {
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NS_ABORT_IF_FALSE(i < mNumProps, "set property index out of range");
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CompressedProperties()[i] = (CompressedCSSProperty)aProperty;
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}
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void SetNumPropsToZero() {
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mNumProps = 0;
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}
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};
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// Make sure the values and properties are aligned appropriately. (These
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// assertions are stronger than necessary to keep them simple.)
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static_assert(sizeof(nsCSSCompressedDataBlock) == 8,
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"nsCSSCompressedDataBlock's size has changed");
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static_assert(NS_ALIGNMENT_OF(nsCSSValue) == 4 || NS_ALIGNMENT_OF(nsCSSValue) == 8,
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"nsCSSValue doesn't align with nsCSSCompressedDataBlock");
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static_assert(NS_ALIGNMENT_OF(nsCSSCompressedDataBlock::CompressedCSSProperty) == 2,
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"CompressedCSSProperty doesn't align with nsCSSValue");
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// Make sure that sizeof(CompressedCSSProperty) is big enough.
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static_assert(eCSSProperty_COUNT_no_shorthands <=
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nsCSSCompressedDataBlock::MaxCompressedCSSProperty,
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"nsCSSProperty doesn't fit in StoredSizeOfCSSProperty");
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class nsCSSExpandedDataBlock {
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friend class nsCSSCompressedDataBlock;
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public:
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nsCSSExpandedDataBlock();
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~nsCSSExpandedDataBlock();
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private:
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/* Property storage may not be accessed directly; use AddLonghandProperty
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* and friends.
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*/
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nsCSSValue mValues[eCSSProperty_COUNT_no_shorthands];
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public:
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/**
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* Transfer all of the state from a pair of compressed data blocks
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* to this expanded block. This expanded block must be clear
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* beforehand.
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*
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* This method DELETES both of the compressed data blocks it is
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* passed. (This is necessary because ownership of sub-objects
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* is transferred to the expanded block.)
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*/
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void Expand(nsCSSCompressedDataBlock *aNormalBlock,
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nsCSSCompressedDataBlock *aImportantBlock);
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/**
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* Allocate new compressed blocks and transfer all of the state
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* from this expanded block to the new blocks, clearing this
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* expanded block. A normal block will always be allocated, but
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* an important block will only be allocated if there are
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* !important properties in the expanded block; otherwise
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* |*aImportantBlock| will be set to null.
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*
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* aOrder is an array of nsCSSProperty values specifying the order
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* to store values in the two data blocks.
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*/
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void Compress(nsCSSCompressedDataBlock **aNormalBlock,
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nsCSSCompressedDataBlock **aImportantBlock,
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const nsTArray<uint32_t>& aOrder);
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/**
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* Copy a value into this expanded block. This does NOT destroy
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* the source value object. |aProperty| cannot be a shorthand.
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*/
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void AddLonghandProperty(nsCSSProperty aProperty, const nsCSSValue& aValue);
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/**
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* Clear the state of this expanded block.
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*/
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void Clear();
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/**
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* Clear the data for the given property (including the set and
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* important bits). Can be used with shorthand properties.
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*/
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void ClearProperty(nsCSSProperty aPropID);
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/**
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* Same as ClearProperty, but faster and cannot be used with shorthands.
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*/
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void ClearLonghandProperty(nsCSSProperty aPropID);
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/**
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* Transfer the state for |aPropID| (which may be a shorthand)
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* from |aFromBlock| to this block. The property being transferred
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* is !important if |aIsImportant| is true, and should replace an
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* existing !important property regardless of its own importance
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* if |aOverrideImportant| is true. |aEnabledState| is used to
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* determine which longhand components of |aPropID| (if it is a
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* shorthand) to transfer.
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*
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* Returns true if something changed, false otherwise. Calls
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* |ValueAppended| on |aDeclaration| if the property was not
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* previously set, or in any case if |aMustCallValueAppended| is true.
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*/
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bool TransferFromBlock(nsCSSExpandedDataBlock& aFromBlock,
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nsCSSProperty aPropID,
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nsCSSProps::EnabledState aEnabledState,
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bool aIsImportant,
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bool aOverrideImportant,
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bool aMustCallValueAppended,
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mozilla::css::Declaration* aDeclaration);
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/**
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* Copies the values for aPropID into the specified aRuleData object.
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*
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* This is used for copying parsed-at-computed-value-time properties
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* that had variable references. aPropID must be a longhand property.
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*/
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void MapRuleInfoInto(nsCSSProperty aPropID, nsRuleData* aRuleData) const;
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void AssertInitialState() {
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#ifdef DEBUG
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DoAssertInitialState();
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#endif
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}
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private:
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/**
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* Compute the number of properties that will be present in the
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* result of |Compress|.
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*/
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void ComputeNumProps(uint32_t* aNumPropsNormal,
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uint32_t* aNumPropsImportant);
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void DoExpand(nsCSSCompressedDataBlock *aBlock, bool aImportant);
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/**
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* Worker for TransferFromBlock; cannot be used with shorthands.
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*/
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bool DoTransferFromBlock(nsCSSExpandedDataBlock& aFromBlock,
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nsCSSProperty aPropID,
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bool aIsImportant,
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bool aOverrideImportant,
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bool aMustCallValueAppended,
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mozilla::css::Declaration* aDeclaration);
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#ifdef DEBUG
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void DoAssertInitialState();
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#endif
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/*
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* mPropertiesSet stores a bit for every property that is present,
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* to optimize compression of blocks with small numbers of
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* properties (the norm) and to allow quickly checking whether a
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* property is set in this block.
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*/
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nsCSSPropertySet mPropertiesSet;
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/*
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* mPropertiesImportant indicates which properties are '!important'.
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*/
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nsCSSPropertySet mPropertiesImportant;
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/*
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* Return the storage location within |this| of the value of the
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* property |aProperty|.
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*/
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nsCSSValue* PropertyAt(nsCSSProperty aProperty) {
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NS_ABORT_IF_FALSE(0 <= aProperty &&
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aProperty < eCSSProperty_COUNT_no_shorthands,
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"property out of range");
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return &mValues[aProperty];
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}
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const nsCSSValue* PropertyAt(nsCSSProperty aProperty) const {
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NS_ABORT_IF_FALSE(0 <= aProperty &&
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aProperty < eCSSProperty_COUNT_no_shorthands,
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"property out of range");
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return &mValues[aProperty];
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}
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void SetPropertyBit(nsCSSProperty aProperty) {
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mPropertiesSet.AddProperty(aProperty);
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}
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void ClearPropertyBit(nsCSSProperty aProperty) {
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mPropertiesSet.RemoveProperty(aProperty);
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}
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bool HasPropertyBit(nsCSSProperty aProperty) {
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return mPropertiesSet.HasProperty(aProperty);
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}
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void SetImportantBit(nsCSSProperty aProperty) {
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mPropertiesImportant.AddProperty(aProperty);
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}
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void ClearImportantBit(nsCSSProperty aProperty) {
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mPropertiesImportant.RemoveProperty(aProperty);
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}
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bool HasImportantBit(nsCSSProperty aProperty) {
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return mPropertiesImportant.HasProperty(aProperty);
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}
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void ClearSets() {
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mPropertiesSet.Empty();
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mPropertiesImportant.Empty();
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}
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};
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#endif /* !defined(nsCSSDataBlock_h__) */
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