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Not (Really) Part Of The Build (Yet). Make gfxSkipCharsIterator::IsOriginalCharSkipped operate correctly when the iterator is currently pointed at a zero-length run.

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This commit is contained in:
roc+@cs.cmu.edu 2007-05-14 20:09:16 -07:00
parent e74bb303b6
commit b9c2535e4d
1 changed files with 15 additions and 5 deletions
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20
gfx/thebes/src/gfxSkipChars.cpp
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@ -184,15 +184,25 @@ gfxSkipCharsIterator::IsOriginalCharSkipped(PRInt32* aRunLength) const
return mSkipChars->mCharCount == PRUint32(mOriginalStringOffset);
}
PRUint32 listPrefixLength = mListPrefixLength;
// figure out which segment we're in
PRUint32 currentRunLength = mSkipChars->mList[mListPrefixLength];
PRUint32 currentRunLength = mSkipChars->mList[listPrefixLength];
// Zero-length list entries are possible. Advance until mListPrefixLength
// is pointing to a run with real characters (or we're at the end of the
// string).
while (currentRunLength == 0 && listPrefixLength < mSkipChars->mListLength - 1) {
++listPrefixLength;
// This does not break the iterator's invariant because no skipped
// or kept characters are being added
currentRunLength = mSkipChars->mList[listPrefixLength];
}
NS_ASSERTION(PRUint32(mOriginalStringOffset) >= mListPrefixCharCount,
"Invariant violation");
PRUint32 offsetIntoCurrentRun =
PRUint32(mOriginalStringOffset) - mListPrefixCharCount;
if (mListPrefixLength >= mSkipChars->mListLength - 1 &&
if (listPrefixLength >= mSkipChars->mListLength - 1 &&
offsetIntoCurrentRun >= currentRunLength) {
NS_ASSERTION(mListPrefixLength == mSkipChars->mListLength - 1 &&
NS_ASSERTION(listPrefixLength == mSkipChars->mListLength - 1 &&
offsetIntoCurrentRun == currentRunLength,
"Overran end of string");
// We're at the end of the string
@ -202,13 +212,13 @@ gfxSkipCharsIterator::IsOriginalCharSkipped(PRInt32* aRunLength) const
return PR_TRUE;
}
PRBool isSkipped = !IsKeepEntry(mListPrefixLength);
PRBool isSkipped = !IsKeepEntry(listPrefixLength);
if (aRunLength) {
// Long runs of all-skipped or all-kept characters will be encoded as
// sequences of 255, 0, 255, 0 etc. Compute the maximum run length by skipping
// over zero entries.
PRUint32 runLength = currentRunLength - offsetIntoCurrentRun;
for (PRUint32 i = mListPrefixLength + 2; i < mSkipChars->mListLength; i += 2) {
for (PRUint32 i = listPrefixLength + 2; i < mSkipChars->mListLength; i += 2) {
if (mSkipChars->mList[i - 1] != 0)
break;
runLength += mSkipChars->mList[i];