mirror of https://github.com/SixLabors/ImageSharp
James Jackson-South
6 years ago
committed by
GitHub
GitHub
24 changed files with 664 additions and 606 deletions
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// Copyright (c) Six Labors and contributors.
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// Licensed under the Apache License, Version 2.0.
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using System; |
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using System.Runtime.CompilerServices; |
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namespace SixLabors.ImageSharp.Advanced |
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{ |
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/// <summary>
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/// Defines the contract for an action that operates on a row.
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/// </summary>
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public interface IRowAction |
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{ |
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/// <summary>
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/// Invokes the method passing the row y coordinate.
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/// </summary>
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/// <param name="y">The row y coordinate.</param>
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void Invoke(int y); |
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} |
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/// <summary>
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/// A <see langword="struct"/> that wraps a value delegate of a specified type, and info on the memory areas to process
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/// </summary>
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/// <typeparam name="T">The type of value delegate to invoke</typeparam>
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internal readonly struct WrappingRowAction<T> |
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where T : struct, IRowAction |
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{ |
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public readonly int MinY; |
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public readonly int MaxY; |
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public readonly int StepY; |
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public readonly int MaxX; |
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private readonly T action; |
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[MethodImpl(InliningOptions.ShortMethod)] |
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public WrappingRowAction(int minY, int maxY, int stepY, in T action) |
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: this(minY, maxY, stepY, 0, action) |
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{ |
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} |
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[MethodImpl(InliningOptions.ShortMethod)] |
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public WrappingRowAction(int minY, int maxY, int stepY, int maxX, in T action) |
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{ |
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this.MinY = minY; |
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this.MaxY = maxY; |
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this.StepY = stepY; |
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this.MaxX = maxX; |
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this.action = action; |
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} |
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[MethodImpl(InliningOptions.ShortMethod)] |
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public void Invoke(int i) |
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{ |
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int yMin = this.MinY + (i * this.StepY); |
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if (yMin >= this.MaxY) |
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{ |
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return; |
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} |
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int yMax = Math.Min(yMin + this.StepY, this.MaxY); |
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for (int y = yMin; y < yMax; y++) |
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{ |
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// Skip the safety copy when invoking a potentially impure method on a readonly field
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Unsafe.AsRef(this.action).Invoke(y); |
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} |
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} |
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} |
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} |
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// Copyright (c) Six Labors and contributors.
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// Licensed under the Apache License, Version 2.0.
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using System; |
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using System.Buffers; |
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using System.Runtime.CompilerServices; |
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using SixLabors.ImageSharp.Memory; |
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namespace SixLabors.ImageSharp.Advanced |
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{ |
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/// <summary>
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/// Defines the contract for an action that operates on a row with a temporary buffer.
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/// </summary>
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/// <typeparam name="TBuffer">The type of buffer elements.</typeparam>
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public interface IRowAction<TBuffer> |
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where TBuffer : unmanaged |
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{ |
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/// <summary>
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/// Invokes the method passing the row and a buffer.
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/// </summary>
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/// <param name="y">The row y coordinate.</param>
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/// <param name="span">The contiguous region of memory.</param>
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void Invoke(int y, Span<TBuffer> span); |
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} |
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internal readonly struct WrappingRowAction<T, TBuffer> |
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where T : struct, IRowAction<TBuffer> |
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where TBuffer : unmanaged |
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{ |
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public readonly int MinY; |
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public readonly int MaxY; |
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public readonly int StepY; |
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public readonly int MaxX; |
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private readonly MemoryAllocator allocator; |
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private readonly T action; |
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[MethodImpl(InliningOptions.ShortMethod)] |
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public WrappingRowAction( |
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int minY, |
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int maxY, |
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int stepY, |
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MemoryAllocator allocator, |
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in T action) |
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: this(minY, maxY, stepY, 0, allocator, action) |
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{ |
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} |
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[MethodImpl(InliningOptions.ShortMethod)] |
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public WrappingRowAction( |
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int minY, |
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int maxY, |
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int stepY, |
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int maxX, |
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MemoryAllocator allocator, |
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in T action) |
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{ |
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this.MinY = minY; |
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this.MaxY = maxY; |
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this.StepY = stepY; |
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this.MaxX = maxX; |
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this.allocator = allocator; |
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this.action = action; |
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} |
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[MethodImpl(InliningOptions.ShortMethod)] |
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public void Invoke(int i) |
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{ |
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int yMin = this.MinY + (i * this.StepY); |
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if (yMin >= this.MaxY) |
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{ |
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return; |
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} |
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int yMax = Math.Min(yMin + this.StepY, this.MaxY); |
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using IMemoryOwner<TBuffer> buffer = this.allocator.Allocate<TBuffer>(this.MaxX); |
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Span<TBuffer> span = buffer.Memory.Span; |
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for (int y = yMin; y < yMax; y++) |
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{ |
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Unsafe.AsRef(this.action).Invoke(y, span); |
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} |
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} |
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} |
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} |
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