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QTextEngine: don't pass empty data to bidiReorder

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The algorithm in QTextEngine::bidiReorder() doesn't like an empty level
and visual order list. Found by GCC 12's slightly misleading warning:

qtextengine.cpp:3838:29: error: ‘levels’ may be used uninitialized [-Werror=maybe-uninitialized]
qtextengine.cpp:1174:6: note: by argument 2 of type ‘const quint8*’ {aka ‘const unsigned char*’} to ‘static void QTextEngine::bidiReorder(int, const quint8*, int*)’ declared here
qtextengine.cpp:3835:28: note: ‘levels’ declared here
 3835 |     QVarLengthArray<uchar> levels(nItems);
      |                            ^~~~~~

Pick-to: 6.2 6.3
Change-Id: If05aeeb7176e4f13af9afffd16e8490f131f160e
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
This commit is contained in:
Thiago Macieira 2022-04-22 10:45:36 -07:00
parent e92e48bc79
commit 54eae2d610
1 changed files with 6 additions and 4 deletions
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10
src/gui/text/qtextengine.cpp
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@ -3832,10 +3832,12 @@ QTextLineItemIterator::QTextLineItemIterator(QTextEngine *_eng, int _lineNum, co
x += eng->alignLine(line);
QVarLengthArray<uchar> levels(nItems);
for (int i = 0; i < nItems; ++i)
levels[i] = eng->layoutData->items.at(i + firstItem).analysis.bidiLevel;
QTextEngine::bidiReorder(nItems, levels.data(), visualOrder.data());
if (nItems > 0) {
QVarLengthArray<uchar> levels(nItems);
for (int i = 0; i < nItems; ++i)
levels[i] = eng->layoutData->items.at(i + firstItem).analysis.bidiLevel;
QTextEngine::bidiReorder(nItems, levels.data(), visualOrder.data());
}
eng->shapeLine(line);
}