The Tor Browser: layout/base/nsStyleChangeList.cpp@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 /*

     7  * a list of the recomputation that needs to be done in response to a

     8  * style change

     9  */

    11 #include "nsStyleChangeList.h"

    12 #include "nsIContent.h"

    14 static const uint32_t kGrowArrayBy = 10;

    16 nsStyleChangeList::nsStyleChangeList()

    17   : mArray(mBuffer),

    18     mArraySize(kStyleChangeBufferSize),

    19     mCount(0)

    20 {

    21   MOZ_COUNT_CTOR(nsStyleChangeList);

    22 }

    24 nsStyleChangeList::~nsStyleChangeList()

    25 {

    26   MOZ_COUNT_DTOR(nsStyleChangeList);

    27   Clear();

    28 }

    30 nsresult

    31 nsStyleChangeList::ChangeAt(int32_t aIndex, nsIFrame*& aFrame, nsIContent*& aContent,

    32                             nsChangeHint& aHint) const

    33 {

    34   if ((0 <= aIndex) && (aIndex < mCount)) {

    35     aFrame = mArray[aIndex].mFrame;

    36     aContent = mArray[aIndex].mContent;

    37     aHint = mArray[aIndex].mHint;

    38     return NS_OK;

    39   }

    40   return NS_ERROR_ILLEGAL_VALUE;

    41 }

    43 nsresult

    44 nsStyleChangeList::ChangeAt(int32_t aIndex, const nsStyleChangeData** aChangeData) const

    45 {

    46   if ((0 <= aIndex) && (aIndex < mCount)) {

    47     *aChangeData = &mArray[aIndex];

    48     return NS_OK;

    49   }

    50   return NS_ERROR_ILLEGAL_VALUE;

    51 }

    53 nsresult

    54 nsStyleChangeList::AppendChange(nsIFrame* aFrame, nsIContent* aContent, nsChangeHint aHint)

    55 {

    56   NS_ASSERTION(aFrame || (aHint & nsChangeHint_ReconstructFrame),

    57                "must have frame");

    58   NS_ASSERTION(aContent || !(aHint & nsChangeHint_ReconstructFrame),

    59                "must have content");

    60   // XXXbz we should make this take Element instead of nsIContent

    61   NS_ASSERTION(!aContent || aContent->IsElement(),

    62                "Shouldn't be trying to restyle non-elements directly");

    63   NS_ASSERTION(!(aHint & nsChangeHint_AllReflowHints) ||

    64                (aHint & nsChangeHint_NeedReflow),

    65                "Reflow hint bits set without actually asking for a reflow");

    67   if ((0 < mCount) && (aHint & nsChangeHint_ReconstructFrame)) { // filter out all other changes for same content

    68     if (aContent) {

    69       for (int32_t index = mCount - 1; index >= 0; --index) {

    70         if (aContent == mArray[index].mContent) { // remove this change

    71           aContent->Release();

    72           mCount--;

    73           if (index < mCount) { // move later changes down

    74             ::memmove(&mArray[index], &mArray[index + 1],

    75                       (mCount - index) * sizeof(nsStyleChangeData));

    76           }

    77         }

    78       }

    79     }

    80   }

    82   int32_t last = mCount - 1;

    83   if ((0 < mCount) && aFrame && (aFrame == mArray[last].mFrame)) { // same as last frame

    84     NS_UpdateHint(mArray[last].mHint, aHint);

    85   }

    86   else {

    87     if (mCount == mArraySize) {

    88       int32_t newSize = mArraySize + kGrowArrayBy;

    89       nsStyleChangeData* newArray = new nsStyleChangeData[newSize];

    90       if (newArray) {

    91         memcpy(newArray, mArray, mCount * sizeof(nsStyleChangeData));

    92         if (mArray != mBuffer) {

    93           delete [] mArray;

    94         }

    95         mArray = newArray;

    96         mArraySize = newSize;

    97       }

    98       else {

    99         return NS_ERROR_OUT_OF_MEMORY;

   100       }

   101     }

   102     mArray[mCount].mFrame = aFrame;

   103     mArray[mCount].mContent = aContent;

   104     if (aContent) {

   105       aContent->AddRef();

   106     }

   107     mArray[mCount].mHint = aHint;

   108     mCount++;

   109   }

   110   return NS_OK;

   111 }

   113 void

   114 nsStyleChangeList::Clear()

   115 {

   116   for (int32_t index = mCount - 1; index >= 0; --index) {

   117     nsIContent* content = mArray[index].mContent;

   118     if (content) {

   119       content->Release();

   120     }

   121   }

   122   if (mArray != mBuffer) {

   123     delete [] mArray;

   124     mArray = mBuffer;

   125     mArraySize = kStyleChangeBufferSize;

   126   }

   127   mCount = 0;

   128 }

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