ClemensFischer/XAML-Map-Control
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Update TileImageLoader.cs

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ClemensFischer 2025-08-25 20:41:33 +02:00
parent 67f319e98c
commit a70dfef794
1 changed files with 39 additions and 25 deletions
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64
MapControl/Shared/TileImageLoader.cs
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@ -3,11 +3,9 @@ using Microsoft.Extensions.Caching.Memory;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
#if WPF
using System.Windows.Media;
@ -72,7 +70,7 @@ namespace MapControl
/// </summary>
public static int MaxLoadTasks { get; set; } = 4;
private readonly ConcurrentStack<Tile> tileStack = new ConcurrentStack<Tile>();
private readonly Queue<Tile> tileQueue = new Queue<Tile>();
private int tileCount;
private int taskCount;
@ -87,43 +85,59 @@ namespace MapControl
cacheName = null; // disable caching
}
var currentTiles = tiles.Where(tile => tile.IsPending).Reverse().ToArray();
tileStack.Clear();
tileStack.PushRange(currentTiles);
tileCount = currentTiles.Length;
var maxTasks = Math.Min(tileCount, MaxLoadTasks);
while (taskCount < maxTasks)
lock (tileQueue)
{
Interlocked.Increment(ref taskCount);
Logger?.LogDebug("Task count: {count}", taskCount);
tileQueue.Clear();
_ = Task.Run(LoadTiles);
}
foreach (var tile in tiles.Where(tile => tile.IsPending))
{
tileQueue.Enqueue(tile);
}
async Task LoadTiles()
{
await LoadTilesFromStack(tileSource, cacheName, progress).ConfigureAwait(false);
tileCount = tileQueue.Count;
Interlocked.Decrement(ref taskCount);
Logger?.LogDebug("Task count: {count}", taskCount);
var maxTasks = Math.Min(tileCount, MaxLoadTasks);
while (taskCount < maxTasks)
{
taskCount++;
Logger?.LogDebug("Task count: {count}", taskCount);
_ = Task.Run(async () => await LoadTilesFromStack(tileSource, cacheName, progress).ConfigureAwait(false));
}
}
}
public void CancelLoadTiles()
{
tileStack.Clear();
lock (tileQueue)
{
tileQueue.Clear();
tileCount = 0;
}
}
private async Task LoadTilesFromStack(TileSource tileSource, string cacheName, IProgress<double> progress)
{
while (tileStack.TryPop(out var tile))
while (true)
{
tile.IsPending = false;
Tile tile;
int tileNumber;
var tileNumber = tileCount - tileStack.Count;
lock (tileQueue)
{
if (tileQueue.Count == 0)
{
taskCount--;
Logger?.LogDebug("Task count: {count}", taskCount);
break;
}
tile = tileQueue.Dequeue();
tileNumber = tileCount - tileQueue.Count;
}
tile.IsPending = false;
progress?.Report((double)tileNumber / tileCount);