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Correctly calculate the max chunk level when no overview is available (#3771)

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Alexander Bock
2025-11-17 14:48:25 +01:00
parent f7cb1b4edb
commit 28367dcfbe
1 changed files with 12 additions and 1 deletions
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modules/globebrowsing/src/rawtiledatareader.cpp
+12 -1
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@@ -413,7 +413,18 @@ void RawTileDataReader::initialize() {
_padfTransform = geoTransform(_rasterXSize, _rasterYSize);
}
_maxChunkLevel = _dataset->GetRasterBand(1)->GetOverviewCount();
const int nOverviews = _dataset->GetRasterBand(1)->GetOverviewCount();
if (nOverviews > 0) {
_maxChunkLevel = nOverviews;
}
else {
const int sizeLevel0 = _dataset->GetRasterBand(1)->GetXSize();
const double diff = log2(sizeLevel0) - log2(_initData.dimensions.x);
const double intdiff = diff >= 0 ? ceil(diff) : floor(diff);
_maxChunkLevel = intdiff;
}
}
void RawTileDataReader::reset() {