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Bug 1324042 - Fix trimmedOffsets arithmetic in GetRenderedText(). r=mats, a=RyanVM

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MozReview-Commit-ID: H4ngU8Juyln

--HG--
extra : rebase_source : f4d6ab58ae70e485dfe72d5290cf6fae2c8397dd
extra : intermediate-source : bec50ba1fb12aebde4e4065b2799bc730bc30010
extra : source : fbf54020043bd09c162530907b2a1091a10f4f92
This commit is contained in:
Daniel Holbert 2018-02-10 08:46:49 -08:00 • committed by Roy Tam
commit 8d0ffc3c31
1 changed files with 5 additions and 1 deletions
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6
layout/generic/nsTextFrame.cpp
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@ -9751,9 +9751,13 @@ nsTextFrame::GetRenderedText(uint32_t aStartOffset,
startOffset = aStartOffset;
endOffset = std::min<uint32_t>(INT32_MAX, aEndOffset);
}
// If startOffset and/or endOffset are inside of trimmedOffsets' range,
// then clamp the edges of trimmedOffsets accordingly.
int32_t origTrimmedOffsetsEnd = trimmedOffsets.GetEnd();
trimmedOffsets.mStart = std::max<uint32_t>(trimmedOffsets.mStart,
startOffset);
trimmedOffsets.mLength = std::min<uint32_t>(trimmedOffsets.GetEnd(),
trimmedOffsets.mLength = std::min<uint32_t>(origTrimmedOffsetsEnd,
endOffset) - trimmedOffsets.mStart;
if (trimmedOffsets.mLength <= 0) {
offsetInRenderedString = nextOffsetInRenderedString;