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Add a heuristic to discard ESRI's "No data available yet" tiles (closes #717)

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This commit is contained in:
Alexander Bock
2018-11-21 14:32:01 -05:00
parent 5c25a88ba5
commit 1910450419
1 changed files with 68 additions and 0 deletions
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modules/globebrowsing/src/rawtiledatareader.cpp
+68
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@@ -57,6 +57,63 @@ namespace openspace::globebrowsing {
namespace {
// These are some locations in memory taken from ESRI's No Data Available tile so that we
// can spotcheck these tiles and not present them
// The pair is <byte index, expected value>
struct MemoryLocation {
int offset;
std::byte value;
};
// The memory locations are grouped to be mostly cache-aligned
constexpr std::array<MemoryLocation, 42> NoDataAvailableData = {
MemoryLocation{ 296380, std::byte(205) },
MemoryLocation{ 296381, std::byte(205) },
MemoryLocation{ 296382, std::byte(205) },
MemoryLocation{ 296383, std::byte(255) },
MemoryLocation{ 296384, std::byte(224) },
MemoryLocation{ 296385, std::byte(224) },
MemoryLocation{ 296386, std::byte(224) },
MemoryLocation{ 296387, std::byte(255) },
MemoryLocation{ 296388, std::byte(244) },
MemoryLocation{ 296389, std::byte(244) },
MemoryLocation{ 296390, std::byte(244) },
MemoryLocation{ 296391, std::byte(255) },
MemoryLocation{ 269840, std::byte(209) },
MemoryLocation{ 269841, std::byte(209) },
MemoryLocation{ 269842, std::byte(209) },
MemoryLocation{ 269844, std::byte(203) },
MemoryLocation{ 269845, std::byte(203) },
MemoryLocation{ 269846, std::byte(203) },
MemoryLocation{ 269852, std::byte(221) },
MemoryLocation{ 269853, std::byte(221) },
MemoryLocation{ 269854, std::byte(221) },
MemoryLocation{ 269856, std::byte(225) },
MemoryLocation{ 269857, std::byte(225) },
MemoryLocation{ 269858, std::byte(225) },
MemoryLocation{ 269860, std::byte(218) },
MemoryLocation{ 269861, std::byte(218) },
MemoryLocation{ 240349, std::byte(203) },
MemoryLocation{ 240350, std::byte(203) },
MemoryLocation{ 240352, std::byte(205) },
MemoryLocation{ 240353, std::byte(204) },
MemoryLocation{ 240354, std::byte(205) },
MemoryLocation{ 0, std::byte(204) },
MemoryLocation{ 7, std::byte(255) },
MemoryLocation{ 520, std::byte(204) },
MemoryLocation{ 880, std::byte(204) },
MemoryLocation{ 883, std::byte(255) },
MemoryLocation{ 91686, std::byte(204) },
MemoryLocation{ 372486, std::byte(204) },
MemoryLocation{ 670483, std::byte(255) },
MemoryLocation{ 231684, std::byte(202) },
MemoryLocation{ 232092, std::byte(202) },
MemoryLocation{ 235921, std::byte(203) },
};
enum class Side {
Left = 0,
Top,
@@ -579,6 +636,17 @@ RawTile RawTileDataReader::readTileData(TileIndex tileIndex) const {
RawTile::ReadError worstError = RawTile::ReadError::None;
readImageData(io, worstError, reinterpret_cast<char*>(rawTile.imageData.get()));
for (const MemoryLocation& ml : NoDataAvailableData) {
std::byte* ptr = rawTile.imageData.get();
if (ptr[ml.offset] != ml.value) {
// Bail out as early as possible
break;
}
// If we got here, we have (most likely) a No data yet available tile
worstError = RawTile::ReadError::Failure;
}
rawTile.error = worstError;
rawTile.tileIndex = std::move(tileIndex);
rawTile.textureInitData = _initData;