cleanup & docs

src/ImageSharp/Common/ParallelUtils/ParallelExecutionSettings.cs

@@ -17,6 +17,9 @@ namespace SixLabors.ImageSharp.ParallelUtils
         /// </summary>
         public const int DefaultMinimumPixelsProcessedPerTask = 4096;
 
+        /// <summary>
+        /// Initializes a new instance of the <see cref="ParallelExecutionSettings"/> struct.
+        /// </summary>
         public ParallelExecutionSettings(
             int maxDegreeOfParallelism,
             int minimumPixelsProcessedPerTask,
@@ -27,11 +30,17 @@ namespace SixLabors.ImageSharp.ParallelUtils
             this.MemoryAllocator = memoryAllocator;
         }
 
+        /// <summary>
+        /// Initializes a new instance of the <see cref="ParallelExecutionSettings"/> struct.
+        /// </summary>
         public ParallelExecutionSettings(int maxDegreeOfParallelism, MemoryAllocator memoryAllocator)
             : this(maxDegreeOfParallelism, DefaultMinimumPixelsProcessedPerTask, memoryAllocator)
         {
         }
 
+        /// <summary>
+        /// Gets the MemoryAllocator
+        /// </summary>
         public MemoryAllocator MemoryAllocator { get; }
 
         /// <summary>
@@ -46,6 +55,10 @@ namespace SixLabors.ImageSharp.ParallelUtils
         /// </summary>
         public int MinimumPixelsProcessedPerTask { get; }
 
+        /// <summary>
+        /// Creates a new instance of <see cref="ParallelExecutionSettings"/>
+        /// having <see cref="MinimumPixelsProcessedPerTask"/> multiplied by <paramref name="multiplier"/>
+        /// </summary>
         public ParallelExecutionSettings MultiplyMinimumPixelsPerTask(int multiplier)
         {
             return new ParallelExecutionSettings(

src/ImageSharp/Common/ParallelUtils/ParallelHelper.cs

@@ -127,6 +127,10 @@ namespace SixLabors.ImageSharp.ParallelUtils
                     });
         }
 
+        /// <summary>
+        /// Iterate through the rows of a rectangle in optimized batches defined by <see cref="RowInterval"/>-s
+        /// instantiating a temporary buffer for each <paramref name="body"/> invocation.
+        /// </summary>
         public static void IterateRowsWithTempBuffer<T>(
             Rectangle rectangle,
             Configuration configuration,
@@ -143,11 +147,5 @@ namespace SixLabors.ImageSharp.ParallelUtils
             int result = dividend / divisor;
             return dividend % divisor == 0 ? result : result + 1;
         }
-
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        private static int DivideRound(int dividend, int divisor)
-        {
-            return (dividend + (divisor / 2)) / divisor;
-        }
     }
 }

src/ImageSharp/Memory/RowInterval.cs

@@ -10,6 +10,9 @@ namespace SixLabors.ImageSharp.Memory
     /// </summary>
     internal readonly struct RowInterval
     {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="RowInterval"/> struct.
+        /// </summary>
         public RowInterval(int min, int max)
         {
             DebugGuard.MustBeLessThan(min, max, nameof(min));