forked from mirrors/gecko-dev
311 lines
11 KiB
C++
311 lines
11 KiB
C++
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is nsCSSDataBlock.h.
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*
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* The Initial Developer of the Original Code is L. David Baron.
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* Portions created by the Initial Developer are Copyright (C) 2003
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* L. David Baron <dbaron@dbaron.org> (original author)
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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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 "nsCSSStruct.h"
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struct nsRuleData;
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class nsCSSExpandedDataBlock;
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/**
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* An |nsCSSCompressedDataBlock| holds an immutable chunk of
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* property-value data for a CSS declaration block (which we misname a
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* |nsCSSDeclaration|). Mutation is accomplished through
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* |nsCSSExpandedDataBlock|.
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*/
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class nsCSSCompressedDataBlock {
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public:
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friend class nsCSSExpandedDataBlock;
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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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nsresult 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. This is either an |nsCSSValue*|, |nsCSSRect*|, or an
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* |nsCSSValueList**|, etc.
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*
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* Inefficient (by design).
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*/
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const void* StorageFor(nsCSSProperty aProperty) const;
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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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* Delete all the data stored in this block, and the block itself.
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*/
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void Destroy();
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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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private:
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PRInt32 mStyleBits; // the structs for which we have data, according to
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// |nsCachedStyleData::GetBitForSID|.
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enum { block_chars = 4 }; // put 4 chars in the definition of the class
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// to ensure size not inflated by alignment
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void* operator new(size_t aBaseSize, size_t aDataSize) {
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// subtract off the extra size to store |mBlock_|
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return ::operator new(aBaseSize + aDataSize -
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sizeof(char) * block_chars);
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}
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nsCSSCompressedDataBlock() : mStyleBits(0) {}
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// Only this class (through |Destroy|) or nsCSSExpandedDataBlock (in
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// |Expand|) can delete compressed data blocks.
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~nsCSSCompressedDataBlock() { }
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char* mBlockEnd; // the byte after the last valid byte
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char mBlock_[block_chars]; // must be the last member!
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char* Block() { return mBlock_; }
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char* BlockEnd() { return mBlockEnd; }
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const char* Block() const { return mBlock_; }
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const char* BlockEnd() const { return mBlockEnd; }
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ptrdiff_t DataSize() const { return BlockEnd() - Block(); }
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};
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class nsCSSExpandedDataBlock {
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public:
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nsCSSExpandedDataBlock();
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~nsCSSExpandedDataBlock();
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/*
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* When setting properties in an |nsCSSExpandedDataBlock|, callers
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* must make the appropriate |AddPropertyBit| call.
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*/
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nsCSSFont mFont;
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nsCSSDisplay mDisplay;
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nsCSSMargin mMargin;
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nsCSSList mList;
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nsCSSPosition mPosition;
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nsCSSTable mTable;
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nsCSSColor mColor;
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nsCSSContent mContent;
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nsCSSText mText;
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nsCSSUserInterface mUserInterface;
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nsCSSAural mAural;
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nsCSSPage mPage;
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nsCSSBreaks mBreaks;
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nsCSSXUL mXUL;
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#ifdef MOZ_SVG
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nsCSSSVG mSVG;
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#endif
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nsCSSColumn mColumn;
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/**
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* Transfer all of the state from the compressed block to this
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* expanded block. The state of this expanded block must be clear
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* beforehand.
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*
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* The compressed block passed in IS DESTROYED by this method and
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* set to null, and thus cannot be used again. (This is necessary
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* because ownership of sub-objects is transferred to the expanded
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* 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 a new compressed block and transfer all of the state
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* from this expanded block to the new compressed block, clearing
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* the state of this expanded block.
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*/
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void Compress(nsCSSCompressedDataBlock **aNormalBlock,
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nsCSSCompressedDataBlock **aImportantBlock);
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/**
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* Clear (and thus destroy) 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).
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*/
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void ClearProperty(nsCSSProperty aPropID);
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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 size that will be occupied by the result of
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* |Compress|.
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*/
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struct ComputeSizeResult {
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PRUint32 normal, important;
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};
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ComputeSizeResult ComputeSize();
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void DoExpand(nsCSSCompressedDataBlock *aBlock, PRBool aImportant);
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#ifdef DEBUG
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void DoAssertInitialState();
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#endif
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struct PropertyOffsetInfo {
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// XXX These could probably be pointer-to-member, if the casting can
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// be done correctly.
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size_t block_offset; // offset of value in nsCSSExpandedDataBlock
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size_t ruledata_struct_offset; // offset of nsRuleData* in nsRuleData
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size_t ruledata_member_offset; // offset of value in nsRuleData*
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};
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static const PropertyOffsetInfo kOffsetTable[];
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typedef PRUint8 property_set_type;
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enum { kPropertiesSetChunkSize = 8 }; // number of bits in
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// |property_set_type|.
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// number of |property_set_type|s in the set
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enum { kPropertiesSetChunkCount =
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(eCSSProperty_COUNT_no_shorthands + (kPropertiesSetChunkSize-1)) /
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kPropertiesSetChunkSize };
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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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property_set_type mPropertiesSet[kPropertiesSetChunkCount];
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/*
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* mPropertiesImportant indicates which properties are '!important'.
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*/
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property_set_type mPropertiesImportant[kPropertiesSetChunkCount];
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public:
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/*
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* Return the storage location within |this| of the value of the
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* property (i.e., either an |nsCSSValue*|, |nsCSSRect*|, or
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* |nsCSSValueList**| (etc.).
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*/
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void* PropertyAt(nsCSSProperty aProperty) {
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const PropertyOffsetInfo& offsets =
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nsCSSExpandedDataBlock::kOffsetTable[aProperty];
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return reinterpret_cast<void*>(reinterpret_cast<char*>(this) +
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offsets.block_offset);
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}
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/*
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* Return the storage location within |aRuleData| of the value of
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* the property (i.e., either an |nsCSSValue*|, |nsCSSRect*|, or
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* |nsCSSValueList**| (etc.).
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*/
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static void* RuleDataPropertyAt(nsRuleData *aRuleData,
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nsCSSProperty aProperty) {
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const PropertyOffsetInfo& offsets =
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nsCSSExpandedDataBlock::kOffsetTable[aProperty];
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NS_ASSERTION(offsets.ruledata_struct_offset != size_t(-1),
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"property should not use CSS_PROP_BACKENDONLY");
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char* cssstruct = *reinterpret_cast<char**>
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(reinterpret_cast<char*>(aRuleData) +
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offsets.ruledata_struct_offset);
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return reinterpret_cast<void*>
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(cssstruct + offsets.ruledata_member_offset);
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}
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void AssertInSetRange(nsCSSProperty aProperty) {
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NS_ASSERTION(0 <= aProperty &&
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aProperty < eCSSProperty_COUNT_no_shorthands,
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"out of bounds");
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}
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void SetPropertyBit(nsCSSProperty aProperty) {
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AssertInSetRange(aProperty);
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mPropertiesSet[aProperty / kPropertiesSetChunkSize] |=
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property_set_type(1 << (aProperty % kPropertiesSetChunkSize));
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}
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void ClearPropertyBit(nsCSSProperty aProperty) {
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AssertInSetRange(aProperty);
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mPropertiesSet[aProperty / kPropertiesSetChunkSize] &=
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~property_set_type(1 << (aProperty % kPropertiesSetChunkSize));
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}
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PRBool HasPropertyBit(nsCSSProperty aProperty) {
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AssertInSetRange(aProperty);
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return (mPropertiesSet[aProperty / kPropertiesSetChunkSize] &
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(1 << (aProperty % kPropertiesSetChunkSize))) != 0;
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}
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void SetImportantBit(nsCSSProperty aProperty) {
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AssertInSetRange(aProperty);
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mPropertiesImportant[aProperty / kPropertiesSetChunkSize] |=
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property_set_type(1 << (aProperty % kPropertiesSetChunkSize));
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}
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void ClearImportantBit(nsCSSProperty aProperty) {
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AssertInSetRange(aProperty);
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mPropertiesImportant[aProperty / kPropertiesSetChunkSize] &=
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~property_set_type(1 << (aProperty % kPropertiesSetChunkSize));
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}
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PRBool HasImportantBit(nsCSSProperty aProperty) {
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AssertInSetRange(aProperty);
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return (mPropertiesImportant[aProperty / kPropertiesSetChunkSize] &
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(1 << (aProperty % kPropertiesSetChunkSize))) != 0;
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}
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void ClearSets() {
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memset(mPropertiesSet, 0, sizeof(mPropertiesSet));
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memset(mPropertiesImportant, 0, sizeof(mPropertiesImportant));
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}
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};
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#endif /* !defined(nsCSSDataBlock_h__) */
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