pjs/layout/style/nsRuleData.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Original Author: David W. Hyatt (hyatt@netscape.com)
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/*
* temporary (expanded) representation of property-value pairs used to
* hold data from matched rules during style data computation.
*/
#ifndef nsRuleData_h_
#define nsRuleData_h_
#include "nsCSSProps.h"
#include "nsStyleStructFwd.h"
class nsPresContext;
class nsStyleContext;
struct nsRuleData;
typedef void (*nsPostResolveFunc)(void* aStyleStruct, nsRuleData* aData);
struct nsRuleData
{
const PRUint32 mSIDs;
PRPackedBool mCanStoreInRuleTree;
PRPackedBool mIsImportantRule;
PRUint8 mLevel; // an nsStyleSet::sheetType
nsPresContext* const mPresContext;
nsStyleContext* const mStyleContext;
const nsPostResolveFunc mPostResolveCallback;
// We store nsCSSValues needed to compute the data for one or more
// style structs (specified by the bitfield mSIDs). These are stored
// in a single array allocation (which our caller allocates; see
// AutoCSSValueArray) The offset of each property |prop| in
// mValueStorage is the sum of
// mValueOffsets[nsCSSProps::kSIDTable[prop]] and
// nsCSSProps::PropertyIndexInStruct(prop). The only place we gather
// more than one style struct's data at a time is
// nsRuleNode::HasAuthorSpecifiedRules; therefore some code that we
// know is not called from HasAuthorSpecifiedRules assumes that the
// mValueOffsets for the one struct in mSIDs is zero.
nsCSSValue* const mValueStorage; // our user owns this array
size_t mValueOffsets[nsStyleStructID_Length];
nsRuleData(PRUint32 aSIDs, nsCSSValue* aValueStorage,
nsPresContext* aContext, nsStyleContext* aStyleContext);
#ifdef DEBUG
~nsRuleData();
#else
~nsRuleData() {}
#endif
/**
* Return a pointer to the value object within |this| corresponding
* to property |aProperty|.
*
* This function must only be called if the given property is in
* mSIDs.
*/
nsCSSValue* ValueFor(nsCSSProperty aProperty)
{
NS_ABORT_IF_FALSE(aProperty < eCSSProperty_COUNT_no_shorthands,
"invalid or shorthand property");
nsStyleStructID sid = nsCSSProps::kSIDTable[aProperty];
size_t indexInStruct = nsCSSProps::PropertyIndexInStruct(aProperty);
// This should really be nsCachedStyleData::GetBitForSID, but we can't
// include that here since it includes us.
NS_ABORT_IF_FALSE(mSIDs & (1 << sid),
"calling nsRuleData::ValueFor on property not in mSIDs");
NS_ABORT_IF_FALSE(sid != eStyleStruct_BackendOnly &&
indexInStruct != size_t(-1),
"backend-only property");
return mValueStorage + mValueOffsets[sid] + indexInStruct;
}
const nsCSSValue* ValueFor(nsCSSProperty aProperty) const {
return const_cast<nsRuleData*>(this)->ValueFor(aProperty);
}
/**
* Getters like ValueFor(aProperty), but for each property by name
* (ValueForBackgroundColor, etc.), and more efficient than ValueFor.
* These use the names used for the property on DOM interfaces (the
* 'method' field in nsCSSPropList.h).
*
* Like ValueFor(), the caller must check that the property is within
* mSIDs.
*/
#define CSS_PROP_DOMPROP_PREFIXED(prop_) prop_
#define CSS_PROP(name_, id_, method_, flags_, parsevariant_, kwtable_, \
stylestruct_, stylestructoffset_, animtype_) \
nsCSSValue* ValueFor##method_() { \
NS_ABORT_IF_FALSE(mSIDs & NS_STYLE_INHERIT_BIT(stylestruct_), \
"Calling nsRuleData::ValueFor" #method_ " without " \
"NS_STYLE_INHERIT_BIT(" #stylestruct_ " in mSIDs."); \
nsStyleStructID sid = eStyleStruct_##stylestruct_; \
size_t indexInStruct = \
nsCSSProps::PropertyIndexInStruct(eCSSProperty_##id_); \
NS_ABORT_IF_FALSE(sid != eStyleStruct_BackendOnly && \
indexInStruct != size_t(-1), \
"backend-only property"); \
return mValueStorage + mValueOffsets[sid] + indexInStruct; \
} \
const nsCSSValue* ValueFor##method_() const { \
return const_cast<nsRuleData*>(this)->ValueFor##method_(); \
}
#define CSS_PROP_BACKENDONLY(name_, id_, method_, flags_, parsevariant_, \
kwtable_) \
/* empty; backend-only structs are not in nsRuleData */
#include "nsCSSPropList.h"
#undef CSS_PROP
#undef CSS_PROP_DOMPROP_PREFIXED
#undef CSS_PROP_BACKENDONLY
private:
inline size_t GetPoisonOffset();
};
#endif