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Update MBTileSource.cs

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ClemensFischer 2025-02-23 18:49:07 +01:00
parent f03a627a86
commit 3b29c97bc6
1 changed files with 8 additions and 27 deletions
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33
MBTiles/Shared/MBTileSource.cs
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@ -20,7 +20,7 @@ using ImageSource = Avalonia.Media.IImage;
namespace MapControl.MBTiles
{
public class MBTileSource : TileSource, IDisposable
public sealed class MBTileSource : TileSource, IDisposable
{
private SQLiteConnection connection;
@ -56,30 +56,9 @@ namespace MapControl.MBTiles
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
protected virtual void Dispose(bool disposing)
{
if (disposing)
{
Close();
}
}
public async Task<byte[]> ReadImageBufferAsync(int x, int y, int zoomLevel)
{
using (var command = new SQLiteCommand("select tile_data from tiles where zoom_level=@z and tile_column=@x and tile_row=@y", connection))
{
command.Parameters.AddWithValue("@z", zoomLevel);
command.Parameters.AddWithValue("@x", x);
command.Parameters.AddWithValue("@y", (1 << zoomLevel) - y - 1);
return await command.ExecuteScalarAsync() as byte[];
}
}
public override async Task<ImageSource> LoadImageAsync(int x, int y, int zoomLevel)
{
@ -87,11 +66,13 @@ namespace MapControl.MBTiles
try
{
var buffer = await ReadImageBufferAsync(x, y, zoomLevel);
if (buffer != null)
using (var command = new SQLiteCommand("select tile_data from tiles where zoom_level=@z and tile_column=@x and tile_row=@y", connection))
{
image = await LoadImageAsync(buffer);
command.Parameters.AddWithValue("@z", zoomLevel);
command.Parameters.AddWithValue("@x", x);
command.Parameters.AddWithValue("@y", (1 << zoomLevel) - y - 1);
image = await LoadImageAsync((byte[])await command.ExecuteScalarAsync());
}
}
catch (Exception ex)