1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/layout/style/nsRuleData.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,129 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +/*
1.10 + * temporary (expanded) representation of property-value pairs used to
1.11 + * hold data from matched rules during style data computation.
1.12 + */
1.13 +
1.14 +#ifndef nsRuleData_h_
1.15 +#define nsRuleData_h_
1.16 +
1.17 +#include "mozilla/CSSVariableDeclarations.h"
1.18 +#include "nsCSSProps.h"
1.19 +#include "nsCSSValue.h"
1.20 +#include "nsStyleStructFwd.h"
1.21 +
1.22 +class nsPresContext;
1.23 +class nsStyleContext;
1.24 +struct nsRuleData;
1.25 +
1.26 +typedef void (*nsPostResolveFunc)(void* aStyleStruct, nsRuleData* aData);
1.27 +
1.28 +struct nsRuleData
1.29 +{
1.30 + const uint32_t mSIDs;
1.31 + bool mCanStoreInRuleTree;
1.32 + bool mIsImportantRule;
1.33 + uint16_t mLevel; // an nsStyleSet::sheetType
1.34 + nsPresContext* const mPresContext;
1.35 + nsStyleContext* const mStyleContext;
1.36 +
1.37 + // We store nsCSSValues needed to compute the data for one or more
1.38 + // style structs (specified by the bitfield mSIDs). These are stored
1.39 + // in a single array allocation (which our caller allocates; see
1.40 + // AutoCSSValueArray) The offset of each property |prop| in
1.41 + // mValueStorage is the sum of
1.42 + // mValueOffsets[nsCSSProps::kSIDTable[prop]] and
1.43 + // nsCSSProps::PropertyIndexInStruct(prop). The only place we gather
1.44 + // more than one style struct's data at a time is
1.45 + // nsRuleNode::HasAuthorSpecifiedRules; therefore some code that we
1.46 + // know is not called from HasAuthorSpecifiedRules assumes that the
1.47 + // mValueOffsets for the one struct in mSIDs is zero.
1.48 + nsCSSValue* const mValueStorage; // our user owns this array
1.49 + size_t mValueOffsets[nsStyleStructID_Length];
1.50 +
1.51 + nsAutoPtr<mozilla::CSSVariableDeclarations> mVariables;
1.52 +
1.53 + nsRuleData(uint32_t aSIDs, nsCSSValue* aValueStorage,
1.54 + nsPresContext* aContext, nsStyleContext* aStyleContext);
1.55 +
1.56 +#ifdef DEBUG
1.57 + ~nsRuleData();
1.58 +#else
1.59 + ~nsRuleData() {}
1.60 +#endif
1.61 +
1.62 + /**
1.63 + * Return a pointer to the value object within |this| corresponding
1.64 + * to property |aProperty|.
1.65 + *
1.66 + * This function must only be called if the given property is in
1.67 + * mSIDs.
1.68 + */
1.69 + nsCSSValue* ValueFor(nsCSSProperty aProperty)
1.70 + {
1.71 + NS_ABORT_IF_FALSE(aProperty < eCSSProperty_COUNT_no_shorthands,
1.72 + "invalid or shorthand property");
1.73 +
1.74 + nsStyleStructID sid = nsCSSProps::kSIDTable[aProperty];
1.75 + size_t indexInStruct = nsCSSProps::PropertyIndexInStruct(aProperty);
1.76 +
1.77 + // This should really be nsCachedStyleData::GetBitForSID, but we can't
1.78 + // include that here since it includes us.
1.79 + NS_ABORT_IF_FALSE(mSIDs & (1 << sid),
1.80 + "calling nsRuleData::ValueFor on property not in mSIDs");
1.81 + NS_ABORT_IF_FALSE(sid != eStyleStruct_BackendOnly &&
1.82 + indexInStruct != size_t(-1),
1.83 + "backend-only property");
1.84 +
1.85 + return mValueStorage + mValueOffsets[sid] + indexInStruct;
1.86 + }
1.87 +
1.88 + const nsCSSValue* ValueFor(nsCSSProperty aProperty) const {
1.89 + return const_cast<nsRuleData*>(this)->ValueFor(aProperty);
1.90 + }
1.91 +
1.92 + /**
1.93 + * Getters like ValueFor(aProperty), but for each property by name
1.94 + * (ValueForBackgroundColor, etc.), and more efficient than ValueFor.
1.95 + * These use the names used for the property on DOM interfaces (the
1.96 + * 'method' field in nsCSSPropList.h).
1.97 + *
1.98 + * Like ValueFor(), the caller must check that the property is within
1.99 + * mSIDs.
1.100 + */
1.101 + #define CSS_PROP_PUBLIC_OR_PRIVATE(publicname_, privatename_) privatename_
1.102 + #define CSS_PROP(name_, id_, method_, flags_, pref_, parsevariant_, \
1.103 + kwtable_, stylestruct_, stylestructoffset_, animtype_) \
1.104 + nsCSSValue* ValueFor##method_() { \
1.105 + NS_ABORT_IF_FALSE(mSIDs & NS_STYLE_INHERIT_BIT(stylestruct_), \
1.106 + "Calling nsRuleData::ValueFor" #method_ " without " \
1.107 + "NS_STYLE_INHERIT_BIT(" #stylestruct_ " in mSIDs."); \
1.108 + nsStyleStructID sid = eStyleStruct_##stylestruct_; \
1.109 + size_t indexInStruct = \
1.110 + nsCSSProps::PropertyIndexInStruct(eCSSProperty_##id_); \
1.111 + NS_ABORT_IF_FALSE(sid != eStyleStruct_BackendOnly && \
1.112 + indexInStruct != size_t(-1), \
1.113 + "backend-only property"); \
1.114 + return mValueStorage + mValueOffsets[sid] + indexInStruct; \
1.115 + } \
1.116 + const nsCSSValue* ValueFor##method_() const { \
1.117 + return const_cast<nsRuleData*>(this)->ValueFor##method_(); \
1.118 + }
1.119 + #define CSS_PROP_BACKENDONLY(name_, id_, method_, flags_, pref_, \
1.120 + parsevariant_, kwtable_) \
1.121 + /* empty; backend-only structs are not in nsRuleData */
1.122 + #include "nsCSSPropList.h"
1.123 + #undef CSS_PROP
1.124 + #undef CSS_PROP_PUBLIC_OR_PRIVATE
1.125 + #undef CSS_PROP_BACKENDONLY
1.126 +
1.127 +private:
1.128 + inline size_t GetPoisonOffset();
1.129 +
1.130 +};
1.131 +
1.132 +#endif
