devela/media/image/sixel/dither/
palettes.rs

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1// devela::media::image::sixel::dither::palettes
2
3/// Predefined color palettes for Sixel output.
4///
5/// Each palette represents a specific **color set** used when generating Sixel graphics.
6/// Some palettes correspond to standard terminal capabilities (e.g., XTerm 256),
7/// while others define grayscale levels.
8//
9// # Adaptation
10// - Derived from `sixel_builtin_dither_t` in the `libsixel` C library.
11// - Supports both **color and monochrome** terminal modes.
12// - Controls which colors are available for dithering.
13#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
14#[allow(dead_code, reason = "TODO make public")]
15pub(crate) enum SixelPalette {
16    /// Dithering optimized for monochrome terminals **with a dark background**.
17    MonoDark,
18
19    /// Dithering optimized for monochrome terminals **with a light background**.
20    MonoLight,
21
22    /// Dithering for **xterm 16-color** mode.
23    XTerm16,
24
25    /// Dithering for **xterm 256-color** mode.
26    XTerm256,
27
28    /// Dithering for **VT340 monochrome** mode.
29    VT340Mono,
30
31    /// Dithering for **VT340 color** mode.
32    VT340Color,
33
34    /// **1-bit grayscale dithering** (2 shades).
35    G1,
36
37    /// **2-bit grayscale dithering** (4 shades).
38    G2,
39
40    /// **4-bit grayscale dithering** (16 shades).
41    G4,
42
43    /// **8-bit grayscale dithering** (256 shades).
44    G8,
45}
46
47impl SixelPalette {
48    /// Returns the palette associated with the dithering mode.
49    pub fn palette(self) -> &'static [u8] {
50        match self {
51            SixelPalette::MonoDark => &Self::PAL_MONO_DARK,
52            SixelPalette::MonoLight => &Self::PAL_MONO_LIGHT,
53            SixelPalette::XTerm16 | SixelPalette::XTerm256 => &Self::PAL_XTERM256,
54            SixelPalette::VT340Mono => &Self::PAL_VT340_MONO,
55            SixelPalette::VT340Color => &Self::PAL_VT340_COLOR,
56            SixelPalette::G1 => &Self::PAL_GRAY_1BIT,
57            SixelPalette::G2 => &Self::PAL_GRAY_2BIT,
58            SixelPalette::G4 => &Self::PAL_GRAY_4BIT,
59            SixelPalette::G8 => &Self::PAL_GRAY_8BIT,
60        }
61    }
62
63    /// Returns the number of colors in the palette.
64    pub fn num_colors(self) -> usize {
65        self.palette().len() / 3 // Assuming 3 bytes per RGB color
66    }
67
68    /// Returns the key color for transparency (default `-1`).
69    pub fn keycolor(self) -> i32 {
70        match self {
71            SixelPalette::MonoDark | SixelPalette::MonoLight => 0,
72            _ => -1,
73        }
74    }
75}
76
77impl SixelPalette {
78    /// monochrome terminal with dark background
79    pub(crate) const PAL_MONO_DARK: [u8; 6] = [0x00, 0x00, 0x00, 0xff, 0xff, 0xff];
80
81    /// monochrome terminal with light background
82    pub(crate) const PAL_MONO_LIGHT: [u8; 6] = [0xff, 0xff, 0xff, 0x00, 0x00, 0x00];
83
84    /// 1bit grayscale
85    const PAL_GRAY_1BIT: [u8; 6] = [0x00, 0x00, 0x00, 0xff, 0xff, 0xff];
86
87    /// 2bit grayscale
88    const PAL_GRAY_2BIT: [u8; 12] =
89        [0x00, 0x00, 0x00, 0x55, 0x55, 0x55, 0xaa, 0xaa, 0xaa, 0xff, 0xff, 0xff];
90
91    /// 4bit grayscale
92    #[rustfmt::skip]
93    const PAL_GRAY_4BIT: [u8; 48] = [
94    0x00, 0x00, 0x00, 0x11, 0x11, 0x11, 0x22, 0x22, 0x22, 0x33, 0x33, 0x33, 0x44, 0x44, 0x44, 0x55,
95    0x55, 0x55, 0x66, 0x66, 0x66, 0x77, 0x77, 0x77, 0x88, 0x88, 0x88, 0x99, 0x99, 0x99, 0xaa, 0xaa,
96    0xaa, 0xbb, 0xbb, 0xbb, 0xcc, 0xcc, 0xcc, 0xdd, 0xdd, 0xdd, 0xee, 0xee, 0xee, 0xff, 0xff, 0xff,
97    ];
98
99    /// 8bit grayscale
100    #[rustfmt::skip]
101    const PAL_GRAY_8BIT: [u8; 768] = [
102    0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0x03, 0x03, 0x03, 0x04, 0x04, 0x04, 0x05,
103    0x05, 0x05, 0x06, 0x06, 0x06, 0x07, 0x07, 0x07, 0x08, 0x08, 0x08, 0x09, 0x09, 0x09, 0x0a, 0x0a,
104    0x0a, 0x0b, 0x0b, 0x0b, 0x0c, 0x0c, 0x0c, 0x0d, 0x0d, 0x0d, 0x0e, 0x0e, 0x0e, 0x0f, 0x0f, 0x0f,
105    0x10, 0x10, 0x10, 0x11, 0x11, 0x11, 0x12, 0x12, 0x12, 0x13, 0x13, 0x13, 0x14, 0x14, 0x14, 0x15,
106    0x15, 0x15, 0x16, 0x16, 0x16, 0x17, 0x17, 0x17, 0x18, 0x18, 0x18, 0x19, 0x19, 0x19, 0x1a, 0x1a,
107    0x1a, 0x1b, 0x1b, 0x1b, 0x1c, 0x1c, 0x1c, 0x1d, 0x1d, 0x1d, 0x1e, 0x1e, 0x1e, 0x1f, 0x1f, 0x1f,
108    0x20, 0x20, 0x20, 0x21, 0x21, 0x21, 0x22, 0x22, 0x22, 0x23, 0x23, 0x23, 0x24, 0x24, 0x24, 0x25,
109    0x25, 0x25, 0x26, 0x26, 0x26, 0x27, 0x27, 0x27, 0x28, 0x28, 0x28, 0x29, 0x29, 0x29, 0x2a, 0x2a,
110    0x2a, 0x2b, 0x2b, 0x2b, 0x2c, 0x2c, 0x2c, 0x2d, 0x2d, 0x2d, 0x2e, 0x2e, 0x2e, 0x2f, 0x2f, 0x2f,
111    0x30, 0x30, 0x30, 0x31, 0x31, 0x31, 0x32, 0x32, 0x32, 0x33, 0x33, 0x33, 0x34, 0x34, 0x34, 0x35,
112    0x35, 0x35, 0x36, 0x36, 0x36, 0x37, 0x37, 0x37, 0x38, 0x38, 0x38, 0x39, 0x39, 0x39, 0x3a, 0x3a,
113    0x3a, 0x3b, 0x3b, 0x3b, 0x3c, 0x3c, 0x3c, 0x3d, 0x3d, 0x3d, 0x3e, 0x3e, 0x3e, 0x3f, 0x3f, 0x3f,
114    0x40, 0x40, 0x40, 0x41, 0x41, 0x41, 0x42, 0x42, 0x42, 0x43, 0x43, 0x43, 0x44, 0x44, 0x44, 0x45,
115    0x45, 0x45, 0x46, 0x46, 0x46, 0x47, 0x47, 0x47, 0x48, 0x48, 0x48, 0x49, 0x49, 0x49, 0x4a, 0x4a,
116    0x4a, 0x4b, 0x4b, 0x4b, 0x4c, 0x4c, 0x4c, 0x4d, 0x4d, 0x4d, 0x4e, 0x4e, 0x4e, 0x4f, 0x4f, 0x4f,
117    0x50, 0x50, 0x50, 0x51, 0x51, 0x51, 0x52, 0x52, 0x52, 0x53, 0x53, 0x53, 0x54, 0x54, 0x54, 0x55,
118    0x55, 0x55, 0x56, 0x56, 0x56, 0x57, 0x57, 0x57, 0x58, 0x58, 0x58, 0x59, 0x59, 0x59, 0x5a, 0x5a,
119    0x5a, 0x5b, 0x5b, 0x5b, 0x5c, 0x5c, 0x5c, 0x5d, 0x5d, 0x5d, 0x5e, 0x5e, 0x5e, 0x5f, 0x5f, 0x5f,
120    0x60, 0x60, 0x60, 0x61, 0x61, 0x61, 0x62, 0x62, 0x62, 0x63, 0x63, 0x63, 0x64, 0x64, 0x64, 0x65,
121    0x65, 0x65, 0x66, 0x66, 0x66, 0x67, 0x67, 0x67, 0x68, 0x68, 0x68, 0x69, 0x69, 0x69, 0x6a, 0x6a,
122    0x6a, 0x6b, 0x6b, 0x6b, 0x6c, 0x6c, 0x6c, 0x6d, 0x6d, 0x6d, 0x6e, 0x6e, 0x6e, 0x6f, 0x6f, 0x6f,
123    0x70, 0x70, 0x70, 0x71, 0x71, 0x71, 0x72, 0x72, 0x72, 0x73, 0x73, 0x73, 0x74, 0x74, 0x74, 0x75,
124    0x75, 0x75, 0x76, 0x76, 0x76, 0x77, 0x77, 0x77, 0x78, 0x78, 0x78, 0x79, 0x79, 0x79, 0x7a, 0x7a,
125    0x7a, 0x7b, 0x7b, 0x7b, 0x7c, 0x7c, 0x7c, 0x7d, 0x7d, 0x7d, 0x7e, 0x7e, 0x7e, 0x7f, 0x7f, 0x7f,
126    0x80, 0x80, 0x80, 0x81, 0x81, 0x81, 0x82, 0x82, 0x82, 0x83, 0x83, 0x83, 0x84, 0x84, 0x84, 0x85,
127    0x85, 0x85, 0x86, 0x86, 0x86, 0x87, 0x87, 0x87, 0x88, 0x88, 0x88, 0x89, 0x89, 0x89, 0x8a, 0x8a,
128    0x8a, 0x8b, 0x8b, 0x8b, 0x8c, 0x8c, 0x8c, 0x8d, 0x8d, 0x8d, 0x8e, 0x8e, 0x8e, 0x8f, 0x8f, 0x8f,
129    0x90, 0x90, 0x90, 0x91, 0x91, 0x91, 0x92, 0x92, 0x92, 0x93, 0x93, 0x93, 0x94, 0x94, 0x94, 0x95,
130    0x95, 0x95, 0x96, 0x96, 0x96, 0x97, 0x97, 0x97, 0x98, 0x98, 0x98, 0x99, 0x99, 0x99, 0x9a, 0x9a,
131    0x9a, 0x9b, 0x9b, 0x9b, 0x9c, 0x9c, 0x9c, 0x9d, 0x9d, 0x9d, 0x9e, 0x9e, 0x9e, 0x9f, 0x9f, 0x9f,
132    0xa0, 0xa0, 0xa0, 0xa1, 0xa1, 0xa1, 0xa2, 0xa2, 0xa2, 0xa3, 0xa3, 0xa3, 0xa4, 0xa4, 0xa4, 0xa5,
133    0xa5, 0xa5, 0xa6, 0xa6, 0xa6, 0xa7, 0xa7, 0xa7, 0xa8, 0xa8, 0xa8, 0xa9, 0xa9, 0xa9, 0xaa, 0xaa,
134    0xaa, 0xab, 0xab, 0xab, 0xac, 0xac, 0xac, 0xad, 0xad, 0xad, 0xae, 0xae, 0xae, 0xaf, 0xaf, 0xaf,
135    0xb0, 0xb0, 0xb0, 0xb1, 0xb1, 0xb1, 0xb2, 0xb2, 0xb2, 0xb3, 0xb3, 0xb3, 0xb4, 0xb4, 0xb4, 0xb5,
136    0xb5, 0xb5, 0xb6, 0xb6, 0xb6, 0xb7, 0xb7, 0xb7, 0xb8, 0xb8, 0xb8, 0xb9, 0xb9, 0xb9, 0xba, 0xba,
137    0xba, 0xbb, 0xbb, 0xbb, 0xbc, 0xbc, 0xbc, 0xbd, 0xbd, 0xbd, 0xbe, 0xbe, 0xbe, 0xbf, 0xbf, 0xbf,
138    0xc0, 0xc0, 0xc0, 0xc1, 0xc1, 0xc1, 0xc2, 0xc2, 0xc2, 0xc3, 0xc3, 0xc3, 0xc4, 0xc4, 0xc4, 0xc5,
139    0xc5, 0xc5, 0xc6, 0xc6, 0xc6, 0xc7, 0xc7, 0xc7, 0xc8, 0xc8, 0xc8, 0xc9, 0xc9, 0xc9, 0xca, 0xca,
140    0xca, 0xcb, 0xcb, 0xcb, 0xcc, 0xcc, 0xcc, 0xcd, 0xcd, 0xcd, 0xce, 0xce, 0xce, 0xcf, 0xcf, 0xcf,
141    0xd0, 0xd0, 0xd0, 0xd1, 0xd1, 0xd1, 0xd2, 0xd2, 0xd2, 0xd3, 0xd3, 0xd3, 0xd4, 0xd4, 0xd4, 0xd5,
142    0xd5, 0xd5, 0xd6, 0xd6, 0xd6, 0xd7, 0xd7, 0xd7, 0xd8, 0xd8, 0xd8, 0xd9, 0xd9, 0xd9, 0xda, 0xda,
143    0xda, 0xdb, 0xdb, 0xdb, 0xdc, 0xdc, 0xdc, 0xdd, 0xdd, 0xdd, 0xde, 0xde, 0xde, 0xdf, 0xdf, 0xdf,
144    0xe0, 0xe0, 0xe0, 0xe1, 0xe1, 0xe1, 0xe2, 0xe2, 0xe2, 0xe3, 0xe3, 0xe3, 0xe4, 0xe4, 0xe4, 0xe5,
145    0xe5, 0xe5, 0xe6, 0xe6, 0xe6, 0xe7, 0xe7, 0xe7, 0xe8, 0xe8, 0xe8, 0xe9, 0xe9, 0xe9, 0xea, 0xea,
146    0xea, 0xeb, 0xeb, 0xeb, 0xec, 0xec, 0xec, 0xed, 0xed, 0xed, 0xee, 0xee, 0xee, 0xef, 0xef, 0xef,
147    0xf0, 0xf0, 0xf0, 0xf1, 0xf1, 0xf1, 0xf2, 0xf2, 0xf2, 0xf3, 0xf3, 0xf3, 0xf4, 0xf4, 0xf4, 0xf5,
148    0xf5, 0xf5, 0xf6, 0xf6, 0xf6, 0xf7, 0xf7, 0xf7, 0xf8, 0xf8, 0xf8, 0xf9, 0xf9, 0xf9, 0xfa, 0xfa,
149    0xfa, 0xfb, 0xfb, 0xfb, 0xfc, 0xfc, 0xfc, 0xfd, 0xfd, 0xfd, 0xfe, 0xfe, 0xfe, 0xff, 0xff, 0xff,
150    ];
151
152    /// xterm 256color && xterm 16color
153    #[rustfmt::skip]
154    const PAL_XTERM256: [u8; 768] = [
155    0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00, 0x80, 0x00, 0x80, 0x80, 0x00, 0x00, 0x00, 0x80, 0x80,
156    0x00, 0x80, 0x00, 0x80, 0x80, 0xc0, 0xc0, 0xc0, 0x80, 0x80, 0x80, 0xff, 0x00, 0x00, 0x00, 0xff,
157    0x00, 0xff, 0xff, 0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0xff, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff,
158    0x00, 0x00, 0x00, 0x00, 0x00, 0x5f, 0x00, 0x00, 0x87, 0x00, 0x00, 0xaf, 0x00, 0x00, 0xd7, 0x00,
159    0x00, 0xff, 0x00, 0x5f, 0x00, 0x00, 0x5f, 0x5f, 0x00, 0x5f, 0x87, 0x00, 0x5f, 0xaf, 0x00, 0x5f,
160    0xd7, 0x00, 0x5f, 0xff, 0x00, 0x87, 0x00, 0x00, 0x87, 0x5f, 0x00, 0x87, 0x87, 0x00, 0x87, 0xaf,
161    0x00, 0x87, 0xd7, 0x00, 0x87, 0xff, 0x00, 0xaf, 0x00, 0x00, 0xaf, 0x5f, 0x00, 0xaf, 0x87, 0x00,
162    0xaf, 0xaf, 0x00, 0xaf, 0xd7, 0x00, 0xaf, 0xff, 0x00, 0xd7, 0x00, 0x00, 0xd7, 0x5f, 0x00, 0xd7,
163    0x87, 0x00, 0xd7, 0xaf, 0x00, 0xd7, 0xd7, 0x00, 0xd7, 0xff, 0x00, 0xff, 0x00, 0x00, 0xff, 0x5f,
164    0x00, 0xff, 0x87, 0x00, 0xff, 0xaf, 0x00, 0xff, 0xd7, 0x00, 0xff, 0xff, 0x5f, 0x00, 0x00, 0x5f,
165    0x00, 0x5f, 0x5f, 0x00, 0x87, 0x5f, 0x00, 0xaf, 0x5f, 0x00, 0xd7, 0x5f, 0x00, 0xff, 0x5f, 0x5f,
166    0x00, 0x5f, 0x5f, 0x5f, 0x5f, 0x5f, 0x87, 0x5f, 0x5f, 0xaf, 0x5f, 0x5f, 0xd7, 0x5f, 0x5f, 0xff,
167    0x5f, 0x87, 0x00, 0x5f, 0x87, 0x5f, 0x5f, 0x87, 0x87, 0x5f, 0x87, 0xaf, 0x5f, 0x87, 0xd7, 0x5f,
168    0x87, 0xff, 0x5f, 0xaf, 0x00, 0x5f, 0xaf, 0x5f, 0x5f, 0xaf, 0x87, 0x5f, 0xaf, 0xaf, 0x5f, 0xaf,
169    0xd7, 0x5f, 0xaf, 0xff, 0x5f, 0xd7, 0x00, 0x5f, 0xd7, 0x5f, 0x5f, 0xd7, 0x87, 0x5f, 0xd7, 0xaf,
170    0x5f, 0xd7, 0xd7, 0x5f, 0xd7, 0xff, 0x5f, 0xff, 0x00, 0x5f, 0xff, 0x5f, 0x5f, 0xff, 0x87, 0x5f,
171    0xff, 0xaf, 0x5f, 0xff, 0xd7, 0x5f, 0xff, 0xff, 0x87, 0x00, 0x00, 0x87, 0x00, 0x5f, 0x87, 0x00,
172    0x87, 0x87, 0x00, 0xaf, 0x87, 0x00, 0xd7, 0x87, 0x00, 0xff, 0x87, 0x5f, 0x00, 0x87, 0x5f, 0x5f,
173    0x87, 0x5f, 0x87, 0x87, 0x5f, 0xaf, 0x87, 0x5f, 0xd7, 0x87, 0x5f, 0xff, 0x87, 0x87, 0x00, 0x87,
174    0x87, 0x5f, 0x87, 0x87, 0x87, 0x87, 0x87, 0xaf, 0x87, 0x87, 0xd7, 0x87, 0x87, 0xff, 0x87, 0xaf,
175    0x00, 0x87, 0xaf, 0x5f, 0x87, 0xaf, 0x87, 0x87, 0xaf, 0xaf, 0x87, 0xaf, 0xd7, 0x87, 0xaf, 0xff,
176    0x87, 0xd7, 0x00, 0x87, 0xd7, 0x5f, 0x87, 0xd7, 0x87, 0x87, 0xd7, 0xaf, 0x87, 0xd7, 0xd7, 0x87,
177    0xd7, 0xff, 0x87, 0xff, 0x00, 0x87, 0xff, 0x5f, 0x87, 0xff, 0x87, 0x87, 0xff, 0xaf, 0x87, 0xff,
178    0xd7, 0x87, 0xff, 0xff, 0xaf, 0x00, 0x00, 0xaf, 0x00, 0x5f, 0xaf, 0x00, 0x87, 0xaf, 0x00, 0xaf,
179    0xaf, 0x00, 0xd7, 0xaf, 0x00, 0xff, 0xaf, 0x5f, 0x00, 0xaf, 0x5f, 0x5f, 0xaf, 0x5f, 0x87, 0xaf,
180    0x5f, 0xaf, 0xaf, 0x5f, 0xd7, 0xaf, 0x5f, 0xff, 0xaf, 0x87, 0x00, 0xaf, 0x87, 0x5f, 0xaf, 0x87,
181    0x87, 0xaf, 0x87, 0xaf, 0xaf, 0x87, 0xd7, 0xaf, 0x87, 0xff, 0xaf, 0xaf, 0x00, 0xaf, 0xaf, 0x5f,
182    0xaf, 0xaf, 0x87, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xd7, 0xaf, 0xaf, 0xff, 0xaf, 0xd7, 0x00, 0xaf,
183    0xd7, 0x5f, 0xaf, 0xd7, 0x87, 0xaf, 0xd7, 0xaf, 0xaf, 0xd7, 0xd7, 0xaf, 0xd7, 0xff, 0xaf, 0xff,
184    0x00, 0xaf, 0xff, 0x5f, 0xaf, 0xff, 0x87, 0xaf, 0xff, 0xaf, 0xaf, 0xff, 0xd7, 0xaf, 0xff, 0xff,
185    0xd7, 0x00, 0x00, 0xd7, 0x00, 0x5f, 0xd7, 0x00, 0x87, 0xd7, 0x00, 0xaf, 0xd7, 0x00, 0xd7, 0xd7,
186    0x00, 0xff, 0xd7, 0x5f, 0x00, 0xd7, 0x5f, 0x5f, 0xd7, 0x5f, 0x87, 0xd7, 0x5f, 0xaf, 0xd7, 0x5f,
187    0xd7, 0xd7, 0x5f, 0xff, 0xd7, 0x87, 0x00, 0xd7, 0x87, 0x5f, 0xd7, 0x87, 0x87, 0xd7, 0x87, 0xaf,
188    0xd7, 0x87, 0xd7, 0xd7, 0x87, 0xff, 0xd7, 0xaf, 0x00, 0xd7, 0xaf, 0x5f, 0xd7, 0xaf, 0x87, 0xd7,
189    0xaf, 0xaf, 0xd7, 0xaf, 0xd7, 0xd7, 0xaf, 0xff, 0xd7, 0xd7, 0x00, 0xd7, 0xd7, 0x5f, 0xd7, 0xd7,
190    0x87, 0xd7, 0xd7, 0xaf, 0xd7, 0xd7, 0xd7, 0xd7, 0xd7, 0xff, 0xd7, 0xff, 0x00, 0xd7, 0xff, 0x5f,
191    0xd7, 0xff, 0x87, 0xd7, 0xff, 0xaf, 0xd7, 0xff, 0xd7, 0xd7, 0xff, 0xff, 0xff, 0x00, 0x00, 0xff,
192    0x00, 0x5f, 0xff, 0x00, 0x87, 0xff, 0x00, 0xaf, 0xff, 0x00, 0xd7, 0xff, 0x00, 0xff, 0xff, 0x5f,
193    0x00, 0xff, 0x5f, 0x5f, 0xff, 0x5f, 0x87, 0xff, 0x5f, 0xaf, 0xff, 0x5f, 0xd7, 0xff, 0x5f, 0xff,
194    0xff, 0x87, 0x00, 0xff, 0x87, 0x5f, 0xff, 0x87, 0x87, 0xff, 0x87, 0xaf, 0xff, 0x87, 0xd7, 0xff,
195    0x87, 0xff, 0xff, 0xaf, 0x00, 0xff, 0xaf, 0x5f, 0xff, 0xaf, 0x87, 0xff, 0xaf, 0xaf, 0xff, 0xaf,
196    0xd7, 0xff, 0xaf, 0xff, 0xff, 0xd7, 0x00, 0xff, 0xd7, 0x5f, 0xff, 0xd7, 0x87, 0xff, 0xd7, 0xaf,
197    0xff, 0xd7, 0xd7, 0xff, 0xd7, 0xff, 0xff, 0xff, 0x00, 0xff, 0xff, 0x5f, 0xff, 0xff, 0x87, 0xff,
198    0xff, 0xaf, 0xff, 0xff, 0xd7, 0xff, 0xff, 0xff, 0x08, 0x08, 0x08, 0x12, 0x12, 0x12, 0x1c, 0x1c,
199    0x1c, 0x26, 0x26, 0x26, 0x30, 0x30, 0x30, 0x3a, 0x3a, 0x3a, 0x44, 0x44, 0x44, 0x4e, 0x4e, 0x4e,
200    0x58, 0x58, 0x58, 0x62, 0x62, 0x62, 0x6c, 0x6c, 0x6c, 0x76, 0x76, 0x76, 0x80, 0x80, 0x80, 0x8a,
201    0x8a, 0x8a, 0x94, 0x94, 0x94, 0x9e, 0x9e, 0x9e, 0xa8, 0xa8, 0xa8, 0xb2, 0xb2, 0xb2, 0xbc, 0xbc,
202    0xbc, 0xc6, 0xc6, 0xc6, 0xd0, 0xd0, 0xd0, 0xda, 0xda, 0xda, 0xe4, 0xe4, 0xe4, 0xee, 0xee, 0xee,
203    ];
204
205    /*
206     * VT340 undocumented behavior regarding the color palette reported
207     * by Vertis Sidus(@vrtsds):
208     *     it loads the first fifteen colors as 1 through 15, and loads the
209     *     sixteenth color as 0.
210     */
211
212    /// vt340 monochrome
213    const PAL_VT340_MONO: [u8; 48] = [
214        0x21, 0x21, 0x21, // 1   Gray-2
215        0x42, 0x42, 0x42, // 2   Gray-4
216        0x66, 0x66, 0x66, // 3   Gray-6
217        0x0F, 0x0F, 0x0F, // 4   Gray-1
218        0x33, 0x33, 0x33, // 5   Gray-3
219        0x54, 0x54, 0x54, // 6   Gray-5
220        0x75, 0x75, 0x75, // 7   White 7
221        0x00, 0x00, 0x00, // 8   Black 0
222        0x21, 0x21, 0x21, // 9   Gray-2
223        0x42, 0x42, 0x42, // 10  Gray-4
224        0x66, 0x66, 0x66, // 11  Gray-6
225        0x0F, 0x0F, 0x0F, // 12  Gray-1
226        0x33, 0x33, 0x33, // 13  Gray-3
227        0x54, 0x54, 0x54, // 14  Gray-5
228        0x75, 0x75, 0x75, // 15  White 7
229        0x00, 0x00, 0x00, // 0   Black
230    ];
231
232    /// vt340 color
233    const PAL_VT340_COLOR: [u8; 48] = [
234        0x21, 0x21, 0x21, // 1   Gray-2
235        0x42, 0x42, 0x42, // 2   Gray-4
236        0x66, 0x66, 0x66, // 3   Gray-6
237        0x0F, 0x0F, 0x0F, // 4   Gray-1
238        0x33, 0x33, 0x33, // 5   Gray-3
239        0x54, 0x54, 0x54, // 6   Gray-5
240        0x75, 0x75, 0x75, // 7   White 7
241        0x00, 0x00, 0x00, // 8   Black 0
242        0x21, 0x21, 0x21, // 9   Gray-2
243        0x42, 0x42, 0x42, // 10  Gray-4
244        0x66, 0x66, 0x66, // 11  Gray-6
245        0x0F, 0x0F, 0x0F, // 12  Gray-1
246        0x33, 0x33, 0x33, // 13  Gray-3
247        0x54, 0x54, 0x54, // 14  Gray-5
248        0x75, 0x75, 0x75, // 15  White 7
249        0x00, 0x00, 0x00, // 0   Black
250    ];
251}
devela/media/image/sixel/dither/palettes.rs

devela/media/image/sixel/dither/
palettes.rs
