ClemensFischer/XAML-Map-Control
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Version 4.12.2 Improved TileImageLoader.

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ClemensF 2019-06-13 21:38:01 +02:00
parent 4531e620ca
commit 26bf0b5005
11 changed files with 162 additions and 140 deletions
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95
MapControl/Shared/TileImageLoader.cs
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@ -6,6 +6,7 @@ using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
@ -38,57 +39,42 @@ namespace MapControl
public static TimeSpan DefaultCacheExpiration { get; set; } = TimeSpan.FromDays(1);
/// <summary>
/// Format string for creating cache keys from the SourceName property of a TileSource,
/// the ZoomLevel, XIndex, and Y properties of a Tile, and the image file extension.
/// The default value is "{0};{1};{2};{3}{4}".
/// Format string for creating cache keys from the SourceName property and the
/// ZoomLevel, XIndex, and Y properties of a Tile and the image file extension.
/// The default value is "{0}/{1}/{2}/{3}{4}".
/// </summary>
public static string CacheKeyFormat { get; set; } = "{0};{1};{2};{3}{4}";
public static string CacheKeyFormat { get; set; } = "{0}/{1}/{2}/{3}{4}";
private readonly TileQueue tileQueue = new TileQueue();
private int taskCount;
public TileSource TileSource { get; set; }
public string SourceName { get; set; }
/// <summary>
/// Loads all pending tiles from the tiles collection in up to MaxLoadTasks parallel Tasks.
/// If the UriFormat of the TileSource starts with "http" and the sourceName string is non-empty,
/// tile images are cached in the TileImageLoader's Cache.
/// If the UriFormat of TileSource starts with "http" and SourceName is a non-empty string,
/// tile images will be cached in the TileImageLoader's Cache.
/// </summary>
public void LoadTilesAsync(IEnumerable<Tile> tiles, TileSource tileSource, string sourceName)
public async void LoadTilesAsync(IEnumerable<Tile> tiles)
{
tileQueue.Clear();
tileQueue.Enqueue(tiles);
if (tileSource != null)
var newTasks = Math.Min(tileQueue.Count, MaxLoadTasks) - taskCount;
if (newTasks > 0)
{
tileQueue.Enqueue(tiles);
Interlocked.Add(ref taskCount, newTasks);
var newTasks = Math.Min(tileQueue.Count, MaxLoadTasks) - taskCount;
if (newTasks > 0)
{
Func<Tile, Task> loadTileFunc;
if (Cache != null &&
tileSource.UriFormat != null &&
tileSource.UriFormat.StartsWith("http") &&
!string.IsNullOrEmpty(sourceName))
{
loadTileFunc = tile => LoadCachedTileImageAsync(tile, tileSource, sourceName);
}
else
{
loadTileFunc = tile => LoadTileImageAsync(tile, tileSource);
}
Interlocked.Add(ref taskCount, newTasks);
while (--newTasks >= 0)
{
Task.Run(() => LoadTilesFromQueueAsync(loadTileFunc));
}
}
await Task
.WhenAll(Enumerable.Range(0, newTasks).Select(n => LoadTilesFromQueueAsync()))
.ConfigureAwait(false);
}
}
private async Task LoadTilesFromQueueAsync(Func<Tile, Task> loadTileFunc)
private async Task LoadTilesFromQueueAsync()
{
Tile tile;
@ -96,7 +82,7 @@ namespace MapControl
{
try
{
await loadTileFunc(tile);
await LoadTileImageAsync(tile, TileSource, SourceName).ConfigureAwait(false);
}
catch (Exception ex)
{
@ -107,22 +93,35 @@ namespace MapControl
Interlocked.Decrement(ref taskCount);
}
private async Task LoadCachedTileImageAsync(Tile tile, TileSource tileSource, string sourceName)
private async Task LoadTileImageAsync(Tile tile, TileSource tileSource, string sourceName)
{
var uri = tileSource.GetUri(tile.XIndex, tile.Y, tile.ZoomLevel);
if (uri != null)
if (tileSource != null)
{
var extension = Path.GetExtension(uri.LocalPath);
if (string.IsNullOrEmpty(extension) || extension == ".jpeg")
if (Cache != null &&
tileSource.UriFormat != null &&
tileSource.UriFormat.StartsWith("http") &&
!string.IsNullOrEmpty(sourceName))
{
extension = ".jpg";
var uri = tileSource.GetUri(tile.XIndex, tile.Y, tile.ZoomLevel);
if (uri != null)
{
var extension = Path.GetExtension(uri.LocalPath);
if (string.IsNullOrEmpty(extension) || extension == ".jpeg")
{
extension = ".jpg";
}
var cacheKey = string.Format(CacheKeyFormat, sourceName, tile.ZoomLevel, tile.XIndex, tile.Y, extension);
await LoadCachedTileImageAsync(tile, uri, cacheKey).ConfigureAwait(false);
}
}
else
{
await LoadTileImageAsync(tile, tileSource).ConfigureAwait(false);
}
var cacheKey = string.Format(CacheKeyFormat, sourceName, tile.ZoomLevel, tile.XIndex, tile.Y, extension);
await LoadCachedTileImageAsync(tile, uri, cacheKey);
}
}