89 lines
2.0 KiB
V
89 lines
2.0 KiB
V
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// radare - LGPL - Copyright 2013-2020 - pancake, xarkes
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// ansi 256 color extension for r_cons
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// https://en.wikipedia.org/wiki/ANSI_color
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module ui
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const (
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value_range = [0x00, 0x5f, 0x87, 0xaf, 0xd7, 0xff]!!
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color_table = init_color_table()
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)
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[direct_array_access]
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fn init_color_table() []int {
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mut color_table := []int{len: 256}
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// ansi colors
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color_table[0] = 0x000000
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color_table[1] = 0x800000
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color_table[2] = 0x008000
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color_table[3] = 0x808000
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color_table[4] = 0x000080
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color_table[5] = 0x800080
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color_table[6] = 0x008080
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color_table[7] = 0xc0c0c0
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color_table[8] = 0x808080
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color_table[9] = 0xff0000
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color_table[10] = 0x00ff00
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color_table[11] = 0xffff00
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color_table[12] = 0x0000ff
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color_table[13] = 0xff00ff
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color_table[14] = 0x00ffff
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color_table[15] = 0xffffff
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// color palette
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for i in 0 .. 216 {
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r := value_range[(i / 36) % 6]
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g := value_range[(i / 6) % 6]
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b := value_range[i % 6]
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color_table[i + 16] = ((r << 16) & 0xffffff) + ((g << 8) & 0xffff) + (b & 0xff)
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}
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// grayscale
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for i in 0 .. 24 {
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r := 8 + (i * 10)
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color_table[i + 232] = ((r << 16) & 0xffffff) + ((r << 8) & 0xffff) + (r & 0xff)
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}
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return color_table
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}
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fn clamp(x int, y int, z int) int {
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if x < y {
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return y
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}
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if x > z {
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return z
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}
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return x
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}
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fn approximate_rgb(r int, g int, b int) int {
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grey := r > 0 && r < 255 && r == g && r == b
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if grey {
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return 232 + int(f64(r) / (255 / 24.1))
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}
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k := int(256.0 / 6)
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r2 := clamp(r / k, 0, 5)
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g2 := clamp(g / k, 0, 5)
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b2 := clamp(b / k, 0, 5)
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return 16 + (r2 * 36) + (g2 * 6) + b2
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}
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fn lookup_rgb(r int, g int, b int) int {
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color := (r << 16) + (g << 8) + b
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// lookup extended colors only, coz non-extended can be changed by users.
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for i in 16 .. 256 {
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if color_table[i] == color {
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return i
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}
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}
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return -1
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}
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// converts an RGB color to an ANSI 256-color, approximating it to the nearest available color
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// if an exact match is not found
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fn rgb2ansi(r int, g int, b int) int {
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c := lookup_rgb(r, g, b)
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if c == -1 {
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return approximate_rgb(r, g, b)
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}
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return c
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}
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