mirror of https://github.com/SixLabors/ImageSharp
Anton Firszov
8 years ago
1 changed files with 0 additions and 142 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.Diagnostics; |
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using System.Runtime.CompilerServices; |
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using SixLabors.ImageSharp.Advanced; |
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using SixLabors.ImageSharp.PixelFormats; |
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using SixLabors.Memory; |
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namespace SixLabors.ImageSharp |
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{ |
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/// <summary>
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/// Provides per-pixel access to generic <see cref="Image{TPixel}"/> pixels.
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/// </summary>
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/// <typeparam name="TPixel">The pixel format.</typeparam>
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internal sealed class PixelAccessor<TPixel> : IDisposable, IBuffer2D<TPixel> |
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where TPixel : struct, IPixel<TPixel> |
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{ |
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/// <summary>
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/// Initializes a new instance of the <see cref="PixelAccessor{TPixel}"/> class.
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/// </summary>
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/// <param name="image">The image to provide pixel access for.</param>
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public PixelAccessor(IPixelSource<TPixel> image) |
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{ |
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Guard.NotNull(image, nameof(image)); |
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Guard.MustBeGreaterThan(image.PixelBuffer.Width, 0, "image width"); |
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Guard.MustBeGreaterThan(image.PixelBuffer.Height, 0, "image height"); |
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this.SetPixelBufferUnsafe(image.PixelBuffer); |
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} |
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/// <summary>
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/// Gets the <see cref="Buffer2D{T}"/> containing the pixel data.
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/// </summary>
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internal Buffer2D<TPixel> PixelBuffer { get; private set; } |
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/// <summary>
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/// Gets the size of a single pixel in the number of bytes.
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/// </summary>
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public int PixelSize { get; private set; } |
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/// <summary>
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/// Gets the width of one row in the number of bytes.
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/// </summary>
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public int RowStride { get; private set; } |
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/// <inheritdoc />
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public int Width { get; private set; } |
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/// <inheritdoc />
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public int Height { get; private set; } |
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public IBuffer<TPixel> Buffer => this.PixelBuffer.Buffer; |
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/// <summary>
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/// Gets or sets the pixel at the specified position.
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/// </summary>
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/// <param name="x">The x-coordinate of the pixel. Must be greater than or equal to zero and less than the width of the image.</param>
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/// <param name="y">The y-coordinate of the pixel. Must be greater than or equal to zero and less than the height of the image.</param>
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/// <returns>The <see typeparam="TPixel"/> at the specified position.</returns>
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public TPixel this[int x, int y] |
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{ |
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[MethodImpl(MethodImplOptions.AggressiveInlining)] |
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get |
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{ |
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this.CheckCoordinates(x, y); |
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return this.GetSpan()[(y * this.Width) + x]; |
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} |
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[MethodImpl(MethodImplOptions.AggressiveInlining)] |
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set |
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{ |
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this.CheckCoordinates(x, y); |
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Span<TPixel> span = this.GetSpan(); |
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span[(y * this.Width) + x] = value; |
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} |
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} |
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/// <inheritdoc />
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public void Dispose() |
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{ |
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} |
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/// <summary>
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/// Resets all the pixels to it's initial value.
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/// </summary>
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public void Reset() |
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{ |
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this.PixelBuffer.Buffer.Clear(); |
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} |
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/// <summary>
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/// Sets the pixel buffer in an unsafe manner. This should not be used unless you know what its doing!!!
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/// </summary>
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/// <param name="pixels">The pixels.</param>
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/// <returns>Returns the old pixel data thats has gust been replaced.</returns>
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/// <remarks>If <see cref="M:PixelAccessor.PooledMemory"/> is true then caller is responsible for ensuring <see cref="M:PixelDataPool.Return()"/> is called.</remarks>
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internal Buffer2D<TPixel> SwapBufferOwnership(Buffer2D<TPixel> pixels) |
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{ |
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Buffer2D<TPixel> oldPixels = this.PixelBuffer; |
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this.SetPixelBufferUnsafe(pixels); |
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return oldPixels; |
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} |
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/// <summary>
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/// Sets the pixel buffer in an unsafe manor this should not be used unless you know what its doing!!!
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/// </summary>
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/// <param name="pixels">The pixel buffer</param>
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private void SetPixelBufferUnsafe(Buffer2D<TPixel> pixels) |
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{ |
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this.PixelBuffer = pixels; |
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this.Width = pixels.Width; |
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this.Height = pixels.Height; |
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this.PixelSize = Unsafe.SizeOf<TPixel>(); |
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this.RowStride = this.Width * this.PixelSize; |
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} |
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/// <summary>
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/// Checks the coordinates to ensure they are within bounds.
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/// </summary>
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/// <param name="x">The x-coordinate of the pixel. Must be greater than zero and less than the width of the image.</param>
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/// <param name="y">The y-coordinate of the pixel. Must be greater than zero and less than the height of the image.</param>
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/// <exception cref="ArgumentOutOfRangeException">
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/// Thrown if the coordinates are not within the bounds of the image.
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/// </exception>
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[Conditional("DEBUG")] |
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private void CheckCoordinates(int x, int y) |
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{ |
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if (x < 0 || x >= this.Width) |
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{ |
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throw new ArgumentOutOfRangeException(nameof(x), x, $"{x} is outwith the image bounds."); |
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} |
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if (y < 0 || y >= this.Height) |
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{ |
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throw new ArgumentOutOfRangeException(nameof(y), y, $"{y} is outwith the image bounds."); |
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} |
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} |
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} |
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} |
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