LCOV - code coverage report
Current view: directory - layout/style - nsCSSDataBlock.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 281 13 4.6 %
Date: 2012-06-02 Functions: 29 3 10.3 %

       1                 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2                 : /* ***** BEGIN LICENSE BLOCK *****
       3                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       4                 :  *
       5                 :  * The contents of this file are subject to the Mozilla Public License Version
       6                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       7                 :  * the License. You may obtain a copy of the License at
       8                 :  * http://www.mozilla.org/MPL/
       9                 :  *
      10                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      11                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      12                 :  * for the specific language governing rights and limitations under the
      13                 :  * License.
      14                 :  *
      15                 :  * The Original Code is nsCSSDataBlock.cpp.
      16                 :  *
      17                 :  * The Initial Developer of the Original Code is L. David Baron.
      18                 :  * Portions created by the Initial Developer are Copyright (C) 2003
      19                 :  * the Initial Developer. All Rights Reserved.
      20                 :  *
      21                 :  * Contributor(s):
      22                 :  *   L. David Baron <dbaron@dbaron.org> (original author)
      23                 :  *
      24                 :  * Alternatively, the contents of this file may be used under the terms of
      25                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
      26                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      27                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      28                 :  * of those above. If you wish to allow use of your version of this file only
      29                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      30                 :  * use your version of this file under the terms of the MPL, indicate your
      31                 :  * decision by deleting the provisions above and replace them with the notice
      32                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      33                 :  * the provisions above, a recipient may use your version of this file under
      34                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      35                 :  *
      36                 :  * ***** END LICENSE BLOCK ***** */
      37                 : 
      38                 : /*
      39                 :  * compact representation of the property-value pairs within a CSS
      40                 :  * declaration, and the code for expanding and compacting it
      41                 :  */
      42                 : 
      43                 : #include "nsCSSDataBlock.h"
      44                 : #include "mozilla/css/Declaration.h"
      45                 : #include "nsRuleData.h"
      46                 : #include "nsStyleSet.h"
      47                 : #include "nsStyleContext.h"
      48                 : 
      49                 : namespace css = mozilla::css;
      50                 : 
      51                 : enum {
      52                 :     CDBValueStorage_advance = sizeof(CDBValueStorage)
      53                 : };
      54                 : 
      55                 : /*
      56                 :  * Define a bunch of utility functions for getting the property or any
      57                 :  * of the value types when the cursor is at the beginning of the storage
      58                 :  * for the property-value pair.  The versions taking a non-const cursor
      59                 :  * argument return a reference so that the caller can assign into the
      60                 :  * result.
      61                 :  */
      62                 : 
      63               0 : inline nsCSSProperty& PropertyAtCursor(char *aCursor) {
      64               0 :     return *reinterpret_cast<nsCSSProperty*>(aCursor);
      65                 : }
      66                 : 
      67               0 : inline nsCSSProperty PropertyAtCursor(const char *aCursor) {
      68               0 :     return *reinterpret_cast<const nsCSSProperty*>(aCursor);
      69                 : }
      70                 : 
      71               0 : inline nsCSSValue* ValueAtCursor(char *aCursor) {
      72               0 :     return & reinterpret_cast<CDBValueStorage*>(aCursor)->value;
      73                 : }
      74                 : 
      75               0 : inline const nsCSSValue* ValueAtCursor(const char *aCursor) {
      76               0 :     return & reinterpret_cast<const CDBValueStorage*>(aCursor)->value;
      77                 : }
      78                 : 
      79                 : /**
      80                 :  * Does a fast move of aSource to aDest.  The previous value in
      81                 :  * aDest is cleanly destroyed, and aSource is cleared.  Returns
      82                 :  * true if, before the copy, the value at aSource compared unequal
      83                 :  * to the value at aDest; false otherwise.
      84                 :  */
      85                 : static bool
      86               0 : MoveValue(nsCSSValue* aSource, nsCSSValue* aDest)
      87                 : {
      88               0 :     bool changed = (*aSource != *aDest);
      89               0 :     aDest->~nsCSSValue();
      90               0 :     memcpy(aDest, aSource, sizeof(nsCSSValue));
      91               0 :     new (aSource) nsCSSValue();
      92               0 :     return changed;
      93                 : }
      94                 : 
      95                 : static bool
      96               0 : ShouldIgnoreColors(nsRuleData *aRuleData)
      97                 : {
      98                 :     return aRuleData->mLevel != nsStyleSet::eAgentSheet &&
      99                 :            aRuleData->mLevel != nsStyleSet::eUserSheet &&
     100               0 :            !aRuleData->mPresContext->UseDocumentColors();
     101                 : }
     102                 : 
     103                 : /**
     104                 :  * Tries to call |nsCSSValue::StartImageLoad()| on an image source.
     105                 :  * Image sources are specified by |url()| or |-moz-image-rect()| function.
     106                 :  */
     107                 : static void
     108               0 : TryToStartImageLoadOnValue(const nsCSSValue& aValue, nsIDocument* aDocument)
     109                 : {
     110               0 :   if (aValue.GetUnit() == eCSSUnit_URL) {
     111               0 :     aValue.StartImageLoad(aDocument);
     112                 :   }
     113               0 :   else if (aValue.EqualsFunction(eCSSKeyword__moz_image_rect)) {
     114               0 :     nsCSSValue::Array* arguments = aValue.GetArrayValue();
     115               0 :     NS_ABORT_IF_FALSE(arguments->Count() == 6, "unexpected num of arguments");
     116                 : 
     117               0 :     const nsCSSValue& image = arguments->Item(1);
     118               0 :     if (image.GetUnit() == eCSSUnit_URL)
     119               0 :       image.StartImageLoad(aDocument);
     120                 :   }
     121               0 : }
     122                 : 
     123                 : static void
     124               0 : TryToStartImageLoad(const nsCSSValue& aValue, nsIDocument* aDocument,
     125                 :                     nsCSSProperty aProperty)
     126                 : {
     127               0 :   if (aValue.GetUnit() == eCSSUnit_List) {
     128               0 :     for (const nsCSSValueList* l = aValue.GetListValue(); l; l = l->mNext) {
     129               0 :       TryToStartImageLoad(l->mValue, aDocument, aProperty);
     130                 :     }
     131               0 :   } else if (nsCSSProps::PropHasFlags(aProperty,
     132                 :                                       CSS_PROPERTY_IMAGE_IS_IN_ARRAY_0)) {
     133               0 :     if (aValue.GetUnit() == eCSSUnit_Array) {
     134               0 :       TryToStartImageLoadOnValue(aValue.GetArrayValue()->Item(0), aDocument);
     135                 :     }
     136                 :   } else {
     137               0 :     TryToStartImageLoadOnValue(aValue, aDocument);
     138                 :   }
     139               0 : }
     140                 : 
     141                 : static inline bool
     142               0 : ShouldStartImageLoads(nsRuleData *aRuleData, nsCSSProperty aProperty)
     143                 : {
     144                 :   // Don't initiate image loads for if-visited styles.  This is
     145                 :   // important because:
     146                 :   //  (1) it's a waste of CPU and bandwidth
     147                 :   //  (2) in some cases we'd start the image load on a style change
     148                 :   //      where we wouldn't have started the load initially, which makes
     149                 :   //      which links are visited detectable to Web pages (see bug
     150                 :   //      557287)
     151               0 :   return !aRuleData->mStyleContext->IsStyleIfVisited() &&
     152               0 :          nsCSSProps::PropHasFlags(aProperty, CSS_PROPERTY_START_IMAGE_LOADS);
     153                 : }
     154                 : 
     155                 : void
     156               0 : nsCSSCompressedDataBlock::MapRuleInfoInto(nsRuleData *aRuleData) const
     157                 : {
     158                 :     // If we have no data for these structs, then return immediately.
     159                 :     // This optimization should make us return most of the time, so we
     160                 :     // have to worry much less (although still some) about the speed of
     161                 :     // the rest of the function.
     162               0 :     if (!(aRuleData->mSIDs & mStyleBits))
     163               0 :         return;
     164                 : 
     165               0 :     nsIDocument* doc = aRuleData->mPresContext->Document();
     166                 : 
     167               0 :     const char* cursor = Block();
     168               0 :     const char* cursor_end = BlockEnd();
     169               0 :     while (cursor < cursor_end) {
     170               0 :         nsCSSProperty iProp = PropertyAtCursor(cursor);
     171               0 :         NS_ABORT_IF_FALSE(!nsCSSProps::IsShorthand(iProp), "out of range");
     172               0 :         if (nsCachedStyleData::GetBitForSID(nsCSSProps::kSIDTable[iProp]) &
     173                 :             aRuleData->mSIDs) {
     174               0 :             nsCSSValue* target = aRuleData->ValueFor(iProp);
     175               0 :             if (target->GetUnit() == eCSSUnit_Null) {
     176               0 :                 const nsCSSValue *val = ValueAtCursor(cursor);
     177               0 :                 NS_ABORT_IF_FALSE(val->GetUnit() != eCSSUnit_Null, "oops");
     178               0 :                 if (ShouldStartImageLoads(aRuleData, iProp)) {
     179               0 :                     TryToStartImageLoad(*val, doc, iProp);
     180                 :                 }
     181               0 :                 *target = *val;
     182               0 :                 if (nsCSSProps::PropHasFlags(iProp,
     183               0 :                         CSS_PROPERTY_IGNORED_WHEN_COLORS_DISABLED) &&
     184               0 :                     ShouldIgnoreColors(aRuleData))
     185                 :                 {
     186               0 :                     if (iProp == eCSSProperty_background_color) {
     187                 :                         // Force non-'transparent' background
     188                 :                         // colors to the user's default.
     189               0 :                         if (target->IsNonTransparentColor()) {
     190                 :                             target->SetColorValue(aRuleData->mPresContext->
     191               0 :                                                   DefaultBackgroundColor());
     192                 :                         }
     193                 :                     } else {
     194                 :                         // Ignore 'color', 'border-*-color', etc.
     195               0 :                         *target = nsCSSValue();
     196                 :                     }
     197                 :                 }
     198                 :             }
     199                 :         }
     200               0 :         cursor += CDBValueStorage_advance;
     201                 :     }
     202               0 :     NS_ABORT_IF_FALSE(cursor == cursor_end, "inconsistent data");
     203                 : }
     204                 : 
     205                 : const nsCSSValue*
     206               0 : nsCSSCompressedDataBlock::ValueFor(nsCSSProperty aProperty) const
     207                 : {
     208               0 :     NS_ABORT_IF_FALSE(!nsCSSProps::IsShorthand(aProperty),
     209                 :                       "Don't call for shorthands");
     210                 : 
     211                 :     // If we have no data for this struct, then return immediately.
     212                 :     // This optimization should make us return most of the time, so we
     213                 :     // have to worry much less (although still some) about the speed of
     214                 :     // the rest of the function.
     215               0 :     if (!(nsCachedStyleData::GetBitForSID(nsCSSProps::kSIDTable[aProperty]) &
     216               0 :           mStyleBits))
     217               0 :         return nsnull;
     218                 : 
     219               0 :     const char* cursor = Block();
     220               0 :     const char* cursor_end = BlockEnd();
     221               0 :     while (cursor < cursor_end) {
     222               0 :         nsCSSProperty iProp = PropertyAtCursor(cursor);
     223               0 :         NS_ABORT_IF_FALSE(!nsCSSProps::IsShorthand(iProp), "out of range");
     224               0 :         if (iProp == aProperty) {
     225               0 :             return ValueAtCursor(cursor);
     226                 :         }
     227               0 :         cursor += CDBValueStorage_advance;
     228                 :     }
     229               0 :     NS_ABORT_IF_FALSE(cursor == cursor_end, "inconsistent data");
     230                 : 
     231               0 :     return nsnull;
     232                 : }
     233                 : 
     234                 : bool
     235               0 : nsCSSCompressedDataBlock::TryReplaceValue(nsCSSProperty aProperty,
     236                 :                                           nsCSSExpandedDataBlock& aFromBlock,
     237                 :                                           bool *aChanged)
     238                 : {
     239               0 :     nsCSSValue* newValue = aFromBlock.PropertyAt(aProperty);
     240               0 :     NS_ABORT_IF_FALSE(newValue && newValue->GetUnit() != eCSSUnit_Null,
     241                 :                       "cannot replace with empty value");
     242                 : 
     243               0 :     const nsCSSValue* oldValue = ValueFor(aProperty);
     244               0 :     if (!oldValue) {
     245               0 :         *aChanged = false;
     246               0 :         return false;
     247                 :     }
     248                 : 
     249               0 :     *aChanged = MoveValue(newValue, const_cast<nsCSSValue*>(oldValue));
     250               0 :     aFromBlock.ClearPropertyBit(aProperty);
     251               0 :     return true;
     252                 : }
     253                 : 
     254                 : nsCSSCompressedDataBlock*
     255               0 : nsCSSCompressedDataBlock::Clone() const
     256                 : {
     257               0 :     const char *cursor = Block(), *cursor_end = BlockEnd();
     258                 :     char *result_cursor;
     259                 : 
     260                 :     nsAutoPtr<nsCSSCompressedDataBlock> result
     261               0 :         (new(cursor_end - cursor) nsCSSCompressedDataBlock());
     262               0 :     if (!result)
     263               0 :         return nsnull;
     264               0 :     result_cursor = result->Block();
     265                 : 
     266               0 :     while (cursor < cursor_end) {
     267               0 :         nsCSSProperty iProp = PropertyAtCursor(cursor);
     268               0 :         NS_ABORT_IF_FALSE(!nsCSSProps::IsShorthand(iProp), "out of range");
     269               0 :         PropertyAtCursor(result_cursor) = iProp;
     270                 : 
     271               0 :         const nsCSSValue* val = ValueAtCursor(cursor);
     272               0 :         nsCSSValue *result_val = ValueAtCursor(result_cursor);
     273               0 :         new (result_val) nsCSSValue(*val);
     274               0 :         cursor += CDBValueStorage_advance;
     275               0 :         result_cursor +=  CDBValueStorage_advance;
     276                 :     }
     277               0 :     NS_ABORT_IF_FALSE(cursor == cursor_end, "inconsistent data");
     278                 : 
     279               0 :     result->SetBlockEnd(result_cursor);
     280               0 :     result->mStyleBits = mStyleBits;
     281               0 :     NS_ABORT_IF_FALSE(result->DataSize() == DataSize(), "wrong size");
     282                 : 
     283               0 :     return result.forget();
     284                 : }
     285                 : 
     286               0 : nsCSSCompressedDataBlock::~nsCSSCompressedDataBlock()
     287                 : {
     288               0 :     const char* cursor = Block();
     289               0 :     const char* cursor_end = BlockEnd();
     290               0 :     while (cursor < cursor_end) {
     291               0 :         NS_ABORT_IF_FALSE(!nsCSSProps::IsShorthand(PropertyAtCursor(cursor)),
     292                 :                           "out of range");
     293                 : 
     294               0 :         const nsCSSValue* val = ValueAtCursor(cursor);
     295               0 :         NS_ABORT_IF_FALSE(val->GetUnit() != eCSSUnit_Null, "oops");
     296               0 :         val->~nsCSSValue();
     297               0 :         cursor += CDBValueStorage_advance;
     298                 :     }
     299               0 :     NS_ABORT_IF_FALSE(cursor == cursor_end, "inconsistent data");
     300               0 : }
     301                 : 
     302                 : /* static */ nsCSSCompressedDataBlock*
     303               0 : nsCSSCompressedDataBlock::CreateEmptyBlock()
     304                 : {
     305               0 :     nsCSSCompressedDataBlock *result = new(0) nsCSSCompressedDataBlock();
     306               0 :     result->SetBlockEnd(result->Block());
     307               0 :     return result;
     308                 : }
     309                 : 
     310                 : size_t
     311               0 : nsCSSCompressedDataBlock::SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf) const
     312                 : {
     313               0 :     size_t n = aMallocSizeOf(this);
     314                 : 
     315               0 :     const char* cursor = Block();
     316               0 :     const char* cursor_end = BlockEnd();
     317               0 :     while (cursor < cursor_end) {
     318               0 :         n += ValueAtCursor(cursor)->SizeOfExcludingThis(aMallocSizeOf);
     319               0 :         cursor += CDBValueStorage_advance;
     320                 :     }
     321               0 :     return n;
     322                 : }
     323                 : 
     324                 : /*****************************************************************************/
     325                 : 
     326              24 : nsCSSExpandedDataBlock::nsCSSExpandedDataBlock()
     327                 : {
     328              24 :     AssertInitialState();
     329              24 : }
     330                 : 
     331            5688 : nsCSSExpandedDataBlock::~nsCSSExpandedDataBlock()
     332                 : {
     333              24 :     AssertInitialState();
     334            5664 : }
     335                 : 
     336                 : void
     337               0 : nsCSSExpandedDataBlock::DoExpand(nsCSSCompressedDataBlock *aBlock,
     338                 :                                  bool aImportant)
     339                 : {
     340                 :     /*
     341                 :      * Save needless copying and allocation by copying the memory
     342                 :      * corresponding to the stored data in the compressed block.
     343                 :      */
     344               0 :     const char* cursor = aBlock->Block();
     345               0 :     const char* cursor_end = aBlock->BlockEnd();
     346               0 :     while (cursor < cursor_end) {
     347               0 :         nsCSSProperty iProp = PropertyAtCursor(cursor);
     348               0 :         NS_ABORT_IF_FALSE(!nsCSSProps::IsShorthand(iProp), "out of range");
     349               0 :         NS_ABORT_IF_FALSE(!HasPropertyBit(iProp),
     350                 :                           "compressed block has property multiple times");
     351               0 :         SetPropertyBit(iProp);
     352               0 :         if (aImportant)
     353               0 :             SetImportantBit(iProp);
     354                 : 
     355               0 :         const nsCSSValue* val = ValueAtCursor(cursor);
     356               0 :         nsCSSValue* dest = PropertyAt(iProp);
     357               0 :         NS_ABORT_IF_FALSE(val->GetUnit() != eCSSUnit_Null, "oops");
     358               0 :         NS_ABORT_IF_FALSE(dest->GetUnit() == eCSSUnit_Null,
     359                 :                           "expanding into non-empty block");
     360                 : #ifdef NS_BUILD_REFCNT_LOGGING
     361               0 :         dest->~nsCSSValue();
     362                 : #endif
     363               0 :         memcpy(dest, val, sizeof(nsCSSValue));
     364               0 :         cursor += CDBValueStorage_advance;
     365                 :     }
     366               0 :     NS_ABORT_IF_FALSE(cursor == cursor_end, "inconsistent data");
     367                 : 
     368                 :     // Don't destroy remnants of what we just copied
     369               0 :     aBlock->SetBlockEnd(aBlock->Block());
     370               0 :     delete aBlock;
     371               0 : }
     372                 : 
     373                 : void
     374               0 : nsCSSExpandedDataBlock::Expand(nsCSSCompressedDataBlock *aNormalBlock,
     375                 :                                nsCSSCompressedDataBlock *aImportantBlock)
     376                 : {
     377               0 :     NS_ABORT_IF_FALSE(aNormalBlock, "unexpected null block");
     378               0 :     AssertInitialState();
     379                 : 
     380               0 :     DoExpand(aNormalBlock, false);
     381               0 :     if (aImportantBlock) {
     382               0 :         DoExpand(aImportantBlock, true);
     383                 :     }
     384               0 : }
     385                 : 
     386                 : nsCSSExpandedDataBlock::ComputeSizeResult
     387               0 : nsCSSExpandedDataBlock::ComputeSize()
     388                 : {
     389               0 :     ComputeSizeResult result = {0, 0};
     390               0 :     for (size_t iHigh = 0; iHigh < nsCSSPropertySet::kChunkCount; ++iHigh) {
     391               0 :         if (!mPropertiesSet.HasPropertyInChunk(iHigh))
     392               0 :             continue;
     393               0 :         for (size_t iLow = 0; iLow < nsCSSPropertySet::kBitsInChunk; ++iLow) {
     394               0 :             if (!mPropertiesSet.HasPropertyAt(iHigh, iLow))
     395               0 :                 continue;
     396                 : #ifdef DEBUG
     397               0 :             nsCSSProperty iProp = nsCSSPropertySet::CSSPropertyAt(iHigh, iLow);
     398                 : #endif
     399               0 :             NS_ABORT_IF_FALSE(!nsCSSProps::IsShorthand(iProp), "out of range");
     400               0 :             NS_ABORT_IF_FALSE(PropertyAt(iProp)->GetUnit() != eCSSUnit_Null,
     401                 :                               "null value while computing size");
     402               0 :             if (mPropertiesImportant.HasPropertyAt(iHigh, iLow))
     403               0 :                 result.important += CDBValueStorage_advance;
     404                 :             else
     405               0 :                 result.normal += CDBValueStorage_advance;
     406                 :         }
     407                 :     }
     408                 :     return result;
     409                 : }
     410                 : 
     411                 : void
     412               0 : nsCSSExpandedDataBlock::Compress(nsCSSCompressedDataBlock **aNormalBlock,
     413                 :                                  nsCSSCompressedDataBlock **aImportantBlock)
     414                 : {
     415               0 :     nsAutoPtr<nsCSSCompressedDataBlock> result_normal, result_important;
     416                 :     char *cursor_normal, *cursor_important;
     417                 : 
     418               0 :     ComputeSizeResult size = ComputeSize();
     419                 : 
     420               0 :     result_normal = new(size.normal) nsCSSCompressedDataBlock();
     421               0 :     cursor_normal = result_normal->Block();
     422                 : 
     423               0 :     if (size.important != 0) {
     424               0 :         result_important = new(size.important) nsCSSCompressedDataBlock();
     425               0 :         cursor_important = result_important->Block();
     426                 :     } else {
     427               0 :         result_important = nsnull;
     428               0 :         cursor_important = nsnull;
     429                 :     }
     430                 : 
     431                 :     /*
     432                 :      * Save needless copying and allocation by copying the memory
     433                 :      * corresponding to the stored data in the expanded block, and then
     434                 :      * clearing the data in the expanded block.
     435                 :      */
     436               0 :     for (size_t iHigh = 0; iHigh < nsCSSPropertySet::kChunkCount; ++iHigh) {
     437               0 :         if (!mPropertiesSet.HasPropertyInChunk(iHigh))
     438               0 :             continue;
     439               0 :         for (size_t iLow = 0; iLow < nsCSSPropertySet::kBitsInChunk; ++iLow) {
     440               0 :             if (!mPropertiesSet.HasPropertyAt(iHigh, iLow))
     441               0 :                 continue;
     442               0 :             nsCSSProperty iProp = nsCSSPropertySet::CSSPropertyAt(iHigh, iLow);
     443               0 :             NS_ABORT_IF_FALSE(!nsCSSProps::IsShorthand(iProp), "out of range");
     444                 :             bool important =
     445               0 :                 mPropertiesImportant.HasPropertyAt(iHigh, iLow);
     446               0 :             char *&cursor = important ? cursor_important : cursor_normal;
     447                 :             nsCSSCompressedDataBlock *result =
     448               0 :                 important ? result_important : result_normal;
     449               0 :             nsCSSValue* val = PropertyAt(iProp);
     450               0 :             NS_ABORT_IF_FALSE(val->GetUnit() != eCSSUnit_Null,
     451                 :                               "Null value while compressing");
     452                 :             CDBValueStorage *storage =
     453               0 :                 reinterpret_cast<CDBValueStorage*>(cursor);
     454               0 :             storage->property = iProp;
     455               0 :             memcpy(&storage->value, val, sizeof(nsCSSValue));
     456               0 :             new (val) nsCSSValue();
     457               0 :             cursor += CDBValueStorage_advance;
     458                 :             result->mStyleBits |=
     459               0 :                 nsCachedStyleData::GetBitForSID(nsCSSProps::kSIDTable[iProp]);
     460                 :         }
     461                 :     }
     462                 : 
     463               0 :     result_normal->SetBlockEnd(cursor_normal);
     464               0 :     NS_ABORT_IF_FALSE(result_normal->DataSize() == ptrdiff_t(size.normal),
     465                 :                       "size miscalculation");
     466                 : 
     467               0 :     if (result_important) {
     468               0 :         result_important->SetBlockEnd(cursor_important);
     469               0 :         NS_ABORT_IF_FALSE(result_important->DataSize() ==
     470                 :                           ptrdiff_t(size.important),
     471                 :                           "size miscalculation");
     472                 :     }
     473                 : 
     474               0 :     ClearSets();
     475               0 :     AssertInitialState();
     476               0 :     *aNormalBlock = result_normal.forget();
     477               0 :     *aImportantBlock = result_important.forget();
     478               0 : }
     479                 : 
     480                 : void
     481               0 : nsCSSExpandedDataBlock::AddLonghandProperty(nsCSSProperty aProperty,
     482                 :                                             const nsCSSValue& aValue)
     483                 : {
     484               0 :     NS_ABORT_IF_FALSE(!nsCSSProps::IsShorthand(aProperty),
     485                 :                       "property out of range");
     486               0 :     nsCSSValue& storage = *static_cast<nsCSSValue*>(PropertyAt(aProperty));
     487               0 :     storage = aValue;
     488               0 :     SetPropertyBit(aProperty);
     489               0 : }
     490                 : 
     491                 : void
     492               0 : nsCSSExpandedDataBlock::Clear()
     493                 : {
     494               0 :     for (size_t iHigh = 0; iHigh < nsCSSPropertySet::kChunkCount; ++iHigh) {
     495               0 :         if (!mPropertiesSet.HasPropertyInChunk(iHigh))
     496               0 :             continue;
     497               0 :         for (size_t iLow = 0; iLow < nsCSSPropertySet::kBitsInChunk; ++iLow) {
     498               0 :             if (!mPropertiesSet.HasPropertyAt(iHigh, iLow))
     499               0 :                 continue;
     500               0 :             nsCSSProperty iProp = nsCSSPropertySet::CSSPropertyAt(iHigh, iLow);
     501               0 :             ClearLonghandProperty(iProp);
     502                 :         }
     503                 :     }
     504                 : 
     505               0 :     AssertInitialState();
     506               0 : }
     507                 : 
     508                 : void
     509               0 : nsCSSExpandedDataBlock::ClearProperty(nsCSSProperty aPropID)
     510                 : {
     511               0 :   if (nsCSSProps::IsShorthand(aPropID)) {
     512               0 :     CSSPROPS_FOR_SHORTHAND_SUBPROPERTIES(p, aPropID) {
     513               0 :       ClearLonghandProperty(*p);
     514                 :     }
     515                 :   } else {
     516               0 :     ClearLonghandProperty(aPropID);
     517                 :   }
     518               0 : }
     519                 : 
     520                 : void
     521               0 : nsCSSExpandedDataBlock::ClearLonghandProperty(nsCSSProperty aPropID)
     522                 : {
     523               0 :     NS_ABORT_IF_FALSE(!nsCSSProps::IsShorthand(aPropID), "out of range");
     524                 : 
     525               0 :     ClearPropertyBit(aPropID);
     526               0 :     ClearImportantBit(aPropID);
     527               0 :     PropertyAt(aPropID)->Reset();
     528               0 : }
     529                 : 
     530                 : bool
     531               0 : nsCSSExpandedDataBlock::TransferFromBlock(nsCSSExpandedDataBlock& aFromBlock,
     532                 :                                           nsCSSProperty aPropID,
     533                 :                                           bool aIsImportant,
     534                 :                                           bool aOverrideImportant,
     535                 :                                           bool aMustCallValueAppended,
     536                 :                                           css::Declaration* aDeclaration)
     537                 : {
     538               0 :     if (!nsCSSProps::IsShorthand(aPropID)) {
     539                 :         return DoTransferFromBlock(aFromBlock, aPropID,
     540                 :                                    aIsImportant, aOverrideImportant,
     541               0 :                                    aMustCallValueAppended, aDeclaration);
     542                 :     }
     543                 : 
     544               0 :     bool changed = false;
     545               0 :     CSSPROPS_FOR_SHORTHAND_SUBPROPERTIES(p, aPropID) {
     546                 :         changed |= DoTransferFromBlock(aFromBlock, *p,
     547                 :                                        aIsImportant, aOverrideImportant,
     548               0 :                                        aMustCallValueAppended, aDeclaration);
     549                 :     }
     550               0 :     return changed;
     551                 : }
     552                 : 
     553                 : bool
     554               0 : nsCSSExpandedDataBlock::DoTransferFromBlock(nsCSSExpandedDataBlock& aFromBlock,
     555                 :                                             nsCSSProperty aPropID,
     556                 :                                             bool aIsImportant,
     557                 :                                             bool aOverrideImportant,
     558                 :                                             bool aMustCallValueAppended,
     559                 :                                             css::Declaration* aDeclaration)
     560                 : {
     561               0 :   bool changed = false;
     562               0 :   NS_ABORT_IF_FALSE(aFromBlock.HasPropertyBit(aPropID), "oops");
     563               0 :   if (aIsImportant) {
     564               0 :     if (!HasImportantBit(aPropID))
     565               0 :       changed = true;
     566               0 :     SetImportantBit(aPropID);
     567                 :   } else {
     568               0 :     if (HasImportantBit(aPropID)) {
     569                 :       // When parsing a declaration block, an !important declaration
     570                 :       // is not overwritten by an ordinary declaration of the same
     571                 :       // property later in the block.  However, CSSOM manipulations
     572                 :       // come through here too, and in that case we do want to
     573                 :       // overwrite the property.
     574               0 :       if (!aOverrideImportant) {
     575               0 :         aFromBlock.ClearLonghandProperty(aPropID);
     576               0 :         return false;
     577                 :       }
     578               0 :       changed = true;
     579               0 :       ClearImportantBit(aPropID);
     580                 :     }
     581                 :   }
     582                 : 
     583               0 :   if (aMustCallValueAppended || !HasPropertyBit(aPropID)) {
     584               0 :     aDeclaration->ValueAppended(aPropID);
     585                 :   }
     586                 : 
     587               0 :   SetPropertyBit(aPropID);
     588               0 :   aFromBlock.ClearPropertyBit(aPropID);
     589                 : 
     590                 :   /*
     591                 :    * Save needless copying and allocation by calling the destructor in
     592                 :    * the destination, copying memory directly, and then using placement
     593                 :    * new.
     594                 :    */
     595               0 :   changed |= MoveValue(aFromBlock.PropertyAt(aPropID), PropertyAt(aPropID));
     596               0 :   return changed;
     597                 : }
     598                 : 
     599                 : #ifdef DEBUG
     600                 : void
     601              72 : nsCSSExpandedDataBlock::DoAssertInitialState()
     602                 : {
     603              72 :     mPropertiesSet.AssertIsEmpty("not initial state");
     604              72 :     mPropertiesImportant.AssertIsEmpty("not initial state");
     605                 : 
     606           16920 :     for (PRUint32 i = 0; i < eCSSProperty_COUNT_no_shorthands; ++i) {
     607           16848 :         nsCSSProperty prop = nsCSSProperty(i);
     608           16848 :         NS_ABORT_IF_FALSE(PropertyAt(prop)->GetUnit() == eCSSUnit_Null,
     609                 :                           "not initial state");
     610                 :     }
     611              72 : }
     612                 : #endif

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