mirror of
https://github.com/walles/moar.git
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49 lines
1.4 KiB
Go
49 lines
1.4 KiB
Go
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package twin
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func color256ToRGB(color256 uint8) (r, g, b float64) {
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if color256 < 16 {
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// Standard ANSI colors
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r := float64(standardAnsiColors[color256][0]) / 255.0
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g := float64(standardAnsiColors[color256][1]) / 255.0
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b := float64(standardAnsiColors[color256][2]) / 255.0
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return r, g, b
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}
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if color256 >= 232 {
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// Grayscale. Colors 232-255 map to components 0x08 to 0xee
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gray := float64((color256-232)*0x0a+0x08) / 255.0
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return gray, gray, gray
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}
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// 6x6 color cube
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color0_to_215 := color256 - 16
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components := []uint8{0x00, 0x5f, 0x87, 0xaf, 0xd7, 0xff}
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r = float64(components[(color0_to_215/36)%6]) / 255.0
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g = float64(components[(color0_to_215/6)%6]) / 255.0
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b = float64(components[(color0_to_215/1)%6]) / 255.0
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return r, g, b
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}
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// Source, the 256 colors table from here:
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// https://en.wikipedia.org/wiki/ANSI_escape_code#3-bit_and_4-bit
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var standardAnsiColors = [16][3]uint8{
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{0x00, 0x00, 0x00}, // Black
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{0x80, 0x00, 0x00}, // Red
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{0x00, 0x80, 0x00}, // Green
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{0x80, 0x80, 0x00}, // Yellow
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{0x00, 0x00, 0x80}, // Blue
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{0x80, 0x00, 0x80}, // Magenta
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{0x00, 0x80, 0x80}, // Cyan
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{0x80, 0x80, 0x80}, // White
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{0x80, 0x80, 0x80}, // Bright Black
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{0xff, 0x00, 0x00}, // Bright Red
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{0x00, 0xff, 0x00}, // Bright Green
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{0xff, 0xff, 0x00}, // Bright Yellow
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{0x00, 0x00, 0xff}, // Bright Blue
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{0xff, 0x00, 0xff}, // Bright Magenta
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{0x00, 0xff, 0xff}, // Bright Cyan
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{0xff, 0xff, 0xff}, // Bright White
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}
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