solve edge case

StitchATon2.Benchmark/SingleTileBenchmark.cs

@@ -0,0 +1,77 @@
+using System.Net.Http.Json;
+using BenchmarkDotNet.Attributes;
+using StitchATon2.Domain;
+
+namespace StitchATon2.Benchmark;
+
+public class SingleTileBenchmark
+{
+    private const string Url = "http://localhost:5088/api/image/generate";
+    private readonly TileManager _tileManager = new(Configuration.Default);
+    private readonly Random _random = new();
+    private readonly HttpClient _client = new();
+
+    private string GetRandomCoordinatePair()
+    {
+        var maxId = _tileManager.Configuration.Rows
+                    * _tileManager.Configuration.Columns;
+        
+        var id = _random.Next(maxId);
+        var tile = _tileManager.GetTile(id);
+        return $"{tile.Coordinate}:{tile.Coordinate}";
+    }
+
+    private JsonContent GetRandomDto(float scale, float offsetX = 0, float offsetY = 0)
+    {
+        return JsonContent.Create(new
+        {
+            canvas_rect = GetRandomCoordinatePair(),
+            crop_offset = (float[]) [offsetX, offsetY],
+            crop_size = (float[]) [1f - offsetX, 1f -  offsetY],
+            output_scale = scale,
+        });
+    }
+
+    private JsonContent GetRandomDtoWithOffset(float scale)
+    {
+        var offsetX = _random.NextSingle();
+        var offsetY = _random.NextSingle();
+        return GetRandomDto(scale, offsetX, offsetY);
+    }
+
+    [Benchmark]
+    public async Task NoScaling()
+    {
+        await _client.PostAsync(Url, GetRandomDto(1f));
+    }
+    
+    [Benchmark]
+    public async Task ScaleHalf()
+    {        
+        await _client.PostAsync(Url, GetRandomDto(.5f));
+    }
+    
+    [Benchmark]
+    public async Task ScaleQuarter()
+    {
+        await _client.PostAsync(Url, GetRandomDto(.25f));
+    }
+
+    [Benchmark]
+    public async Task NoScalingWithOffset()
+    {
+        await _client.PostAsync(Url, GetRandomDtoWithOffset(1f));
+    }
+    
+    [Benchmark]
+    public async Task ScaleHalfWithOffset()
+    {        
+        await _client.PostAsync(Url, GetRandomDtoWithOffset(.5f));
+    }
+    
+    [Benchmark]
+    public async Task ScaleQuarterWithOffset()
+    {
+        await _client.PostAsync(Url, GetRandomDtoWithOffset(.25f));
+    }
+}