从16位获得颜色

Question

我正在C＃中玩弄颜色，我想知道如何从16位字节数组中获取颜色值。这是下面的代码，其中我使用了32位字节数组。

                var colorArray = new Color[b.Length/4];                
                for (var i = 0; i < b.Length; i += 4)
                {
                    var color = Color.FromArgb(b[i + 0], b[i + 1], b[i + 2], b[i + 3]);
                    colorArray[i / 4] = color;
                }

Answer 1

您基本上以新格式将每个字段的最高有效位移到正确的位置，并将所有丢失的位掩码为零。绿色分为两个字节。如果数组是一个16位int的数组，这会更容易，但是如果以字节为单位，那么一对字节的位操作大致就是这样。

+----+----+----+----+----+----+---+---+---+---+---+---+---+---+---+---+
|               byte1                 |             byte0             |
+----+----+----+----+----+----+---+---+---+---+---+---+---+---+---+---+
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
+----+----+----+----+----+----+---+---+---+---+---+---+---+---+---+---+
| -  |          Red           |       Green       |       Blue        |
+----+----+----+----+----+----+---+---+---+---+---+---+---+---+---+---+

B8 = (byte0 << 3) & 0xF8;
G8 = ((byte1 << 6) & 0xC0) || ((byte0 >> 2) & 0x38);
R8 = (byte1 << 1) & 0xF8;

B8G8R8 = B8 | (G8 << 8) || (R8 << 16);