c#从A1R5G5B5图像类型读取rgb

Question

我需要在c#中转换2字节(16位)，这是类型为A1R5G5B5的图像的一个像素(因此1位alpha, 5位红色，5位绿色，5位蓝色)从标准的0-255值提前感谢

Answer 1

这是一个快速而肮脏的解决方案，但它应该适合您。

using System.Drawing;
class ShortColor
{
    public bool Alpha { get; set; }
    public byte Red   { get; set; }
    public byte Green { get; set; }
    public byte Blue  { get; set; }
    public ShortColor(short value)
    {
         this.Alpha = (value & 0x8000) > 0;
         this.Red = (byte)((value & 0x7C64) >> 10);
         this.Green = (byte)((value & 0x3E0) >> 5);
         this.Blue = (byte)((value & 0x001F));
    }
    public ShortColor(Color color)
    {
         this.Alpha = color.A != 0;
         this.Red = (byte)(color.R / 8);
         this.Green = (byte)(color.G / 8);
         this.Blue = (byte)(color.B / 8);
    }
    public static explicit operator Color(ShortColor shortColor)
    {
         return Color.FromArgb(
             shortColor.Alpha ? 255 : 0,
             shortColor.Red * 8,
             shortColor.Green * 8,
             shortColor.Blue * 8
         );
    }
}