The Tor Browser / file comparison
comparison: layout/base/nsStyleChangeList.cpp
layout/base/nsStyleChangeList.cpp
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:5c7d2cdf597d |
|---|---|
| 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/. */ | |
| 5 | |
| 6 /* | |
| 7 * a list of the recomputation that needs to be done in response to a | |
| 8 * style change | |
| 9 */ | |
| 10 | |
| 11 #include "nsStyleChangeList.h" | |
| 12 #include "nsIContent.h" | |
| 13 | |
| 14 static const uint32_t kGrowArrayBy = 10; | |
| 15 | |
| 16 nsStyleChangeList::nsStyleChangeList() | |
| 17 : mArray(mBuffer), | |
| 18 mArraySize(kStyleChangeBufferSize), | |
| 19 mCount(0) | |
| 20 { | |
| 21 MOZ_COUNT_CTOR(nsStyleChangeList); | |
| 22 } | |
| 23 | |
| 24 nsStyleChangeList::~nsStyleChangeList() | |
| 25 { | |
| 26 MOZ_COUNT_DTOR(nsStyleChangeList); | |
| 27 Clear(); | |
| 28 } | |
| 29 | |
| 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 } | |
| 42 | |
| 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 } | |
| 52 | |
| 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"); | |
| 66 | |
| 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 } | |
| 81 | |
| 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 } | |
| 112 | |
| 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 } | |
| 129 |
