42 lines
1 KiB
C#
42 lines
1 KiB
C#
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using System.Runtime.CompilerServices;
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namespace Uwaa.PNG;
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internal class Palette
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{
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public bool HasAlphaValues { get; private set; }
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public byte[] Data { get; }
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/// <summary>
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/// Creates a palette object. Input palette data length from PLTE chunk must be a multiple of 3.
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/// </summary>
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public Palette(byte[] data)
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{
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Data = new byte[data.Length * 4 / 3];
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var dataIndex = 0;
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for (var i = 0; i < data.Length; i += 3)
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{
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Data[dataIndex++] = data[i];
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Data[dataIndex++] = data[i + 1];
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Data[dataIndex++] = data[i + 2];
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Data[dataIndex++] = 255;
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}
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}
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/// <summary>
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/// Adds transparency values from tRNS chunk.
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/// </summary>
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public void SetAlphaValues(byte[] bytes)
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{
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HasAlphaValues = true;
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for (var i = 0; i < bytes.Length; i++)
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Data[(i * 4) + 3] = bytes[i];
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}
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public Pixel GetPixel(int index)
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{
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return Unsafe.As<byte, Pixel>(ref Data[index * 4]);
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}
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}
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