GPKG: writer: fix corruption when only a subset of all bands of a tile is flushed#5793
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rouault merged 2 commits intoOSGeo:masterfrom May 30, 2022
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…e is flushed If a block/tile flush happens when only a subset of all bands is 'dirty', and in particular if the alpha band is not yet written, then the tile was wrongly considered as transparent. The issue could happen even when writing all bands together, but under strong pressure on the block cache, due to other threads doing concurrent reads and forcing partial flushing.
…ressure on block cache
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GPKG: writer: fix corruption when only a subset of all bands of a tile is flushed
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If a block/tile flush happens when only a subset of all bands is
'dirty', and in particular if the alpha band is not yet written, then
the tile was wrongly considered as transparent.
The issue could happen even when writing all bands together, but under
strong pressure on the block cache, due to other threads doing
concurrent reads and forcing partial flushing.