/* * meli * * Copyright 2017-2018 Manos Pitsidianakis * * This file is part of meli. * * meli is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * meli is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with meli. If not, see . */ /*! Terminal grid cells, keys, colors, etc. */ extern crate serde; use self::serde::de::Visitor; use self::serde::{de, Deserialize, Deserializer}; extern crate unicode_segmentation; #[macro_use] mod position; #[macro_use] mod cells; #[macro_use] mod keys; pub mod embed; mod text_editing; pub use self::cells::*; pub use self::keys::*; pub use self::position::*; pub use self::text_editing::*; use std::fmt; /* * CSI events we use */ // Some macros taken from termion: /// Create a CSI-introduced sequence. macro_rules! csi { ($( $l:expr ),*) => { concat!("\x1b[", $( $l ),*) }; } /// Derive a CSI sequence struct. macro_rules! derive_csi_sequence { ($(#[$outer:meta])* ($name:ident, $value:expr)) => { $(#[$outer])* #[derive(Copy, Clone)] pub struct $name; impl fmt::Display for $name { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { write!(f, csi!($value)) } } impl AsRef<[u8]> for $name { fn as_ref(&self) -> &'static [u8] { csi!($value).as_bytes() } } impl AsRef for $name { fn as_ref(&self) -> &'static str { csi!($value) } } }; } derive_csi_sequence!( ///Ps = 1 0 0 2 ⇒ Don't use Cell Motion Mouse Tracking, xterm (DisableMouse, "?1002l") ); derive_csi_sequence!( ///Ps = 1 0 0 2 ⇒ Use Cell Motion Mouse Tracking, xterm (EnableMouse, "?1002h") ); derive_csi_sequence!( ///Ps = 1 0 0 6 Enable SGR Mouse Mode, xterm. (EnableSGRMouse, "?1006h") ); derive_csi_sequence!( ///Ps = 1 0 0 6 Disable SGR Mouse Mode, xterm. (DisableSGRMouse, "?1006l") ); derive_csi_sequence!( #[doc = "`CSI Ps ; Ps ; Ps t`, where `Ps = 2 2 ; 0` -> Save xterm icon and window title on stack."] (SaveWindowTitleIconToStack, "22;0t") ); derive_csi_sequence!( #[doc = "Restore window title and icon from terminal's title stack. `CSI Ps ; Ps ; Ps t`, where `Ps = 2 3 ; 0` -> Restore xterm icon and window title from stack."] (RestoreWindowTitleIconFromStack, "23;0t") ); derive_csi_sequence!( #[doc = "Empty struct with a Display implementation that returns the byte sequence to start [Bracketed Paste Mode](http://www.xfree86.org/current/ctlseqs.html#Bracketed%20Paste%20Mode)"] (BracketModeStart, "?2004h") ); derive_csi_sequence!( #[doc = "Empty struct with a Display implementation that returns the byte sequence to end [Bracketed Paste Mode](http://www.xfree86.org/current/ctlseqs.html#Bracketed%20Paste%20Mode)"] (BracketModeEnd, "?2004l") ); pub const BRACKET_PASTE_START: &[u8] = b"\x1B[200~"; pub const BRACKET_PASTE_END: &[u8] = b"\x1B[201~"; pub use braille::BraillePixelIter; mod braille { mod tests { const _X_QRCODE: [u16; 3 * 48] = [ 0xff3f, 0x3cf3, 0xff03, 0xff3f, 0x3cf3, 0xff03, 0x0330, 0x0333, 0x0003, 0x0330, 0x0333, 0x0003, 0xf333, 0xf030, 0x3f03, 0xf333, 0xf030, 0x3f03, 0xf333, 0xfc33, 0x3f03, 0xf333, 0xfc33, 0x3f03, 0xf333, 0x0f33, 0x3f03, 0xf333, 0x0f33, 0x3f03, 0x0330, 0x3033, 0x0003, 0x0330, 0x3033, 0x0003, 0xff3f, 0x33f3, 0xff03, 0xff3f, 0x33f3, 0xff03, 0x0000, 0xc003, 0x0000, 0x0000, 0xc003, 0x0000, 0x3333, 0xfc00, 0xc300, 0x3333, 0xfc00, 0xc300, 0xc3c0, 0x3f30, 0x0c00, 0xc3c0, 0x3f30, 0x0c00, 0xcff0, 0x3f03, 0xcf00, 0xcff0, 0x3f03, 0xcf00, 0x0ccf, 0x0f30, 0xcc00, 0x0ccf, 0x0f30, 0xcc00, 0x0033, 0x3033, 0xf300, 0x0033, 0x3033, 0xf300, 0x0000, 0xffcc, 0x0c00, 0x0000, 0xffcc, 0x0c00, 0xff3f, 0xccfc, 0x3000, 0xff3f, 0xccfc, 0x3000, 0x0330, 0xf0cf, 0x0f00, 0x0330, 0xf0cf, 0x0f00, 0xf333, 0xcffc, 0x3003, 0xf333, 0xcffc, 0x3003, 0xf333, 0x0030, 0xf000, 0xf333, 0x0030, 0xf000, 0xf333, 0x3f03, 0x0303, 0xf333, 0x3f03, 0x0303, 0x0330, 0x3030, 0xf003, 0x0330, 0x3030, 0xf003, 0xff3f, 0x0333, 0x3303, 0xff3f, 0x0333, 0x3303, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, ]; const _XTTHOMAS: [u16; 3 * 48] = [ 0xFFFF, 0xFF0F, 0x0000, 0xFFFF, 0xFF0F, 0x0000, 0x1FFC, 0xC10F, 0x0000, 0x0FFC, 0x810F, 0x0000, 0x07FC, 0x010F, 0x0000, 0x07FC, 0x010F, 0x0000, 0x03FC, 0x010E, 0x0000, 0x03FC, 0x010E, 0x0000, 0x01FC, 0x010C, 0x0000, 0x00FC, 0x0100, 0x0000, 0x00FC, 0x0100, 0x0000, 0x00FC, 0x0100, 0x0000, 0x00FC, 0x0100, 0x0000, 0x00FC, 0x0100, 0x0000, 0x00FC, 0x0100, 0x0000, 0x00FC, 0x0100, 0x0000, 0x00FC, 0x0100, 0x0000, 0x00FC, 0xFDFF, 0xFF7F, 0x00FC, 0xFDFF, 0xFF7F, 0x00FC, 0xFDE0, 0x0F7E, 0x00FC, 0x7DE0, 0x0F7C, 0x00FC, 0x3DE0, 0x0F78, 0x00FC, 0x3DE0, 0x0F78, 0x00FC, 0x1DE0, 0x0F70, 0x00FC, 0x1DE0, 0x0F70, 0x00FC, 0x0DE0, 0x0F60, 0x00FC, 0x01E0, 0x0F00, 0x00FE, 0x07E0, 0x0F00, 0xC0FF, 0x1FE0, 0x0F00, 0xC0FF, 0x1FE0, 0x0F00, 0x0000, 0x00E0, 0x0F00, 0x0000, 0x00E0, 0x0F00, 0x0000, 0x00E0, 0x0F00, 0x0000, 0x00E0, 0x0F00, 0x0000, 0x00E0, 0x0F00, 0x0000, 0x00E0, 0x0F00, 0x0000, 0x00E0, 0x0F00, 0x0000, 0x00E0, 0x0F00, 0x0000, 0x00E0, 0x0F00, 0x0000, 0x00E0, 0x0F00, 0x0000, 0x00E0, 0x0F00, 0x0000, 0x00E0, 0x0F00, 0x0000, 0x00E0, 0x0F00, 0x0000, 0x00E0, 0x0F00, 0x0000, 0x00F0, 0x3F00, 0x0000, 0x00FE, 0xFF00, 0x0000, 0x00FE, 0xFF00, 0x0000, 0x0000, 0x0000, ]; const _FBIRD_SCALED_DOWN: [u16; 3 * 48] = [ 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x00e0, 0x0100, 0x0000, 0x0000, 0x0f00, 0x0000, 0x0000, 0x3c00, 0x0000, 0x00e0, 0x790c, 0x0000, 0x00fc, 0xff3f, 0x0000, 0x0043, 0xffff, 0x0300, 0x0000, 0xfc0f, 0x0000, 0x0000, 0xf00f, 0x0000, 0x0000, 0xf00f, 0x0000, 0x0000, 0xf00f, 0x0000, 0x0000, 0xfc07, 0x0000, 0x0000, 0xfc03, 0x0000, 0x0000, 0xfc00, 0x0000, 0x0000, 0x0e00, 0x0000, 0x0000, 0x0700, 0x0000, 0x0000, 0x0700, 0x0000, 0x0040, 0x0300, 0x0000, 0x0000, 0x0200, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, ]; const _FBIRD: [u16; 3 * 48] = [ 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x007E, 0x0000, 0x0000, 0x00E0, 0x0700, 0x0000, 0x0080, 0x1F00, 0x0000, 0x0000, 0x7F00, 0x0000, 0x007E, 0xFCE0, 0x0000, 0xC0FF, 0xFFF9, 0x0300, 0xF0FF, 0xFFFF, 0x0700, 0x0CE8, 0xFFFF, 0xFF00, 0x0080, 0xFFFF, 0x0103, 0x0000, 0xFEFF, 0x0000, 0x0000, 0xF8FF, 0x0000, 0x0000, 0xF07F, 0x0000, 0x0000, 0xF07F, 0x0000, 0x0000, 0xF87F, 0x0000, 0x0000, 0xFC3F, 0x0000, 0x0000, 0xFE3F, 0x0000, 0x0000, 0xFE1F, 0x0000, 0x0000, 0xFF07, 0x0000, 0x0000, 0xFF01, 0x0000, 0x0080, 0x0F00, 0x0000, 0x0080, 0x0700, 0x0000, 0x00C0, 0x0300, 0x0000, 0x00E0, 0x0300, 0x0000, 0x00F0, 0x0300, 0x0000, 0x00E8, 0x0100, 0x0000, 0x0080, 0x0100, 0x0000, 0x0000, 0x0100, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, ]; const _XFISH: [u16; 3 * 48] = [ 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x007E, 0x0000, 0x0000, 0x00E0, 0x0700, 0x0000, 0x0080, 0x1F00, 0x0000, 0x0000, 0x7F00, 0x0000, 0x007E, 0xFCE0, 0x0000, 0xC0FF, 0xFFF9, 0x0300, 0xF0FF, 0xFFFF, 0x0700, 0x0CE8, 0xFFFF, 0xFF00, 0x0080, 0xFFFF, 0x0103, 0x0000, 0xFEFF, 0x0000, 0x0000, 0xF8FF, 0x0000, 0x0000, 0xF07F, 0x0000, 0x0000, 0xF07F, 0x0000, 0x0000, 0xF87F, 0x0000, 0x0000, 0xFC3F, 0x0000, 0x0000, 0xFE3F, 0x0000, 0x0000, 0xFE1F, 0x0000, 0x0000, 0xFF07, 0x0000, 0x0000, 0xFF01, 0x0000, 0x0080, 0x0F00, 0x0000, 0x0080, 0x0700, 0x0000, 0x00C0, 0x0300, 0x0000, 0x00E0, 0x0300, 0x0000, 0x00F0, 0x0300, 0x0000, 0x00E8, 0x0100, 0x0000, 0x0080, 0x0100, 0x0000, 0x0000, 0x0100, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, ]; const _XFACE: [u16; 3 * 48] = [ 0xAAAA, 0xAAAA, 0xAAAA, 0x0000, 0x0000, 0x0000, 0xAAAA, 0xAAAA, 0xAAA8, 0x0000, 0x0000, 0x0000, 0xA222, 0x2222, 0x222A, 0x0000, 0x0000, 0x0000, 0xAAAA, 0xAAAA, 0xAAA2, 0x0000, 0x0000, 0x0000, 0xA222, 0x2222, 0x2228, 0x0000, 0x0000, 0x0000, 0xAAAA, 0xAAAA, 0xAAAA, 0x0000, 0x0000, 0x0000, 0xA222, 0x2222, 0x2222, 0x0000, 0x0000, 0x0000, 0xAAAA, 0xAAAA, 0xAAA8, 0x0000, 0x0000, 0x0000, 0xA222, 0x2222, 0x222A, 0x0000, 0x0000, 0x0000, 0xAAAA, 0xAAAA, 0xAAA2, 0x0000, 0x0000, 0x0000, 0xA222, 0x2222, 0x2228, 0x0000, 0x0000, 0x0000, 0xAAAA, 0xAAAA, 0xAAAA, 0x0000, 0x0000, 0x0000, 0xA222, 0x2222, 0x2222, 0x0000, 0x0000, 0x0000, 0xAAAA, 0xAAAA, 0xAAA8, 0x0000, 0x0000, 0x0000, 0xA222, 0x2222, 0x222A, 0x0000, 0x0000, 0x0000, 0xAAAA, 0xAAAA, 0xAAA2, 0x0000, 0x0000, 0x0000, 0xA222, 0x2222, 0x2228, 0x0000, 0x0000, 0x0000, 0xAAAA, 0xAAAA, 0xAAAA, 0x0000, 0x0000, 0x0000, 0xA222, 0x2222, 0x2222, 0x0000, 0x0000, 0x0000, 0xAAAA, 0xAAAA, 0xAAA8, 0x0000, 0x0000, 0x0000, 0xA222, 0x2222, 0x222A, 0x0000, 0x0000, 0x0000, 0xAAAA, 0xAAAA, 0xAAA2, 0x0000, 0x0000, 0x0000, 0xA222, 0x2222, 0x2228, 0x0000, 0x0000, 0x0000, 0xAAAA, 0xAAAA, 0xAAAA, 0x0000, 0x0000, 0x0000, ]; #[test] fn test_braille() { /* lines has 12 bitmaps, with 3 bitmap making each line that is 4 lines. * lines = [ * a_0, a_1, a_2, * b_0, b_1, b_2, * c_0, c_1, c_2, * d_0, d_1, d_2, * ]; */ println!("Thomas: "); for lines in _XTTHOMAS.chunks(12) { let iter = super::BraillePixelIter::from(lines); for b in iter { print!("{}", b); } println!(); } println!("fbird: "); for lines in _FBIRD.chunks(12) { let iter = super::BraillePixelIter::from(lines); for b in iter { print!("{}", b); } println!(); } println!("ABC QR code: "); for lines in _X_QRCODE.chunks(12) { let iter = super::BraillePixelIter::from(lines); for b in iter { print!("{}", b); } println!(); } } } struct Braille16bitColumn { // each u16 in the tuple is one line ( first_line, second_line, third_line, fourth line) */ bitmaps: (u16, u16, u16, u16), // reverse 1-indexing, so column: 1 means the left-most column in 16bit word */ bitcolumn: u32, } /* impl std::fmt::Debug for Braille16bitColumn { fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result { write!( f, "Braille16bitColumn {{\n bitmaps: \n{:x}\n{:x}\n{:x}\n{:x},\n bitcolumn: {}\n\n{}\n{:016b}\n{:016b}\n{:016b}\n{:016b},\n }}",self.bitmaps.0, self.bitmaps.1, self.bitmaps.2, self.bitmaps.3, self.bitcolumn, format!("{:016b}", 0x0001_u16.rotate_left(self.bitcolumn)).replace("0"," ").replace("1", "v"), self.bitmaps.0, self.bitmaps.1, self.bitmaps.2, self.bitmaps.3, ) } } */ /// Iterate on 2x4 pixel blocks from a bitmap and return a unicode braille character for each /// block. The iterator holds four lines of bitmaps encoded as `u16` numbers in swapped bit /// order, like the `xbm` graphics format. The bitmap is split to `u16` columns. /// /// ## Usage /// ```no_run /// /* BEE is the contents of a 48x48 xbm file. xbm is a C-like array of 8bit values, and /// * each pair was manually (macro-ually?) condensed into a single 16bit value. Each 3 items /// * represent one pixel row. /// */ /// const BEE: [u16; 3 * 48] = [ /// 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, /// 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, /// 0x0000, 0x0002, 0x0000, 0x0000, 0xe003, 0x0000, 0x0000, 0xfc00, 0x0000, 0x0000, 0x3f00, /// 0x0000, 0x00e0, 0x0f00, 0x0000, 0x00f8, 0x0300, 0x0000, 0x00fe, 0x0000, 0x0080, 0x8f0d, /// 0x0000, 0x00e0, 0xff7f, 0x0000, 0x00f8, 0xffff, 0x0300, 0x00fc, 0xffff, 0x0f00, 0x00fe, /// 0xffff, 0x3f00, 0x00ff, 0xffff, 0xff00, 0xc0ff, 0xffff, 0xff01, 0xc0ff, 0xff77, 0xff07, /// 0xf0f9, 0xffff, 0xff07, 0xf0f0, 0xffef, 0xfd0f, 0xf0e0, 0xffff, 0xfb1f, 0xf0e1, 0xffc1, /// 0xfb0f, 0xe0f3, 0xffc3, 0xf307, 0xc0f7, 0xffc0, 0xe100, 0xc0ff, 0xd9e0, 0x3f00, 0x803e, /// 0xc1f8, 0x5f00, 0x8076, 0x43f4, 0xbf18, 0x806c, 0x43fc, 0xf325, 0x0009, 0xc3df, 0x4326, /// 0x001a, 0xcf3f, 0x622d, 0x0034, 0xff01, 0x2224, 0x00f0, 0xff00, 0x8312, 0x00a0, 0x5700, /// 0x0309, 0x00f8, 0x1b00, 0x8f06, 0x0048, 0x6000, 0xcd03, 0x0018, 0x6624, 0xdf00, 0x0030, /// 0x820f, 0x3f00, 0x00c0, 0xf0ff, 0x3f00, 0x0080, 0x03fe, 0x7f00, 0x0000, 0x7ce0, 0x0f00, /// 0x0000, 0x809f, 0x1c00, 0x0000, 0x0000, 0x3800, 0x0000, 0x0000, 0x7000, 0x0000, 0x0000, /// 0xe000, /// ]; /// /// for lines in BEE.chunks(12) { /// let iter = ui::BraillePixelIter::from(lines); /// for b in iter { /// print!("{}", b); /// } /// println!(""); /// } /// ``` /// /// Output: /// /// ```text /// ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⠀⠀⠀ /// ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣀⣤⣶⠾⠛⠉⠀⠀⠀ /// ⠀⠀⠀⠀⠀⠀⢀⣠⣤⣤⣀⣠⣔⣾⣛⡛⠉⠀⠀⠀⠀⠀⠀⠀ /// ⠀⠀⠀⠀⣠⣾⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣶⣤⣀⠀⠀⠀⠀ /// ⠀⠀⣤⣿⠟⠻⣿⣿⣿⣿⣿⣿⣿⣯⢿⣯⡿⣿⣿⣿⣷⣆⠀⠀ /// ⠀⠀⠻⣿⣦⡀⣼⣿⣿⣿⣿⣿⠯⠉⠉⣿⡿⠘⢿⣿⠿⠟⠁⠀ /// ⠀⠀⠀⢹⠹⣟⢿⡍⣧⠈⠁⡟⠀⣔⣾⣿⣿⠿⣯⣢⡀⡠⢄⠀ /// ⠀⠀⠀⠀⠑⠜⣦⣀⣿⣶⣤⣿⠟⠛⠓⠉⣹⠀⠰⢃⢊⠗⡸⠀ /// ⠀⠀⠀⠀⠀⢰⡚⠞⢛⡑⢣⡅⠀⡀⢀⠀⣟⣶⡀⣴⠵⠊⠀⠀ /// ⠀⠀⠀⠀⠀⠀⠉⠲⠬⣀⣒⡚⠻⠿⢶⣶⣿⣿⠿⠄⠀⠀⠀⠀ /// ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠉⠉⠁⠈⠀⠙⢷⣄⠀⠀⠀ /// ``` /// /// /// ## Explanation: /// For the following bitmap: /// ```text /// ◻◼◻◻◼◻◻◼◻◻◻◼◼◼◼◼ /// ◼◼◼◼◼◼◻◻◼◻◼◻◻◼◼◼ /// ◻◼◼◼◼◼◼◼◻◻◻◻◼◼◻◻ /// ◼◻◼◼◻◼◼◻◼◼◼◻◻◻◻◻ /// ``` /// /// Iteration on each step examines two columns: /// ```text /// ⇩⇩ /// ◻◼┆◻◻┆◼◻┆◻◼┆◻◻┆◻◼┆◼◼┆◼◼ /// ◼◼┆◼◼┆◼◼┆◻◻┆◼◻┆◼◻┆◻◼┆◼◼ /// ◻◼┆◼◼┆◼◼┆◼◼┆◻◻┆◻◻┆◼◼┆◻◻ /// ◼◻┆◼◼┆◻◼┆◼◻┆◼◼┆◼◻┆◻◻┆◻◻ /// ``` /// /// The first two columns are encoded as: /// /// ```text /// ┏━━━━━━┳━━━━┓ /// ┃pixels┃bits┃ /// ┡━━━━━━╇━━━━┩ /// │ ◻◼ │ 14 │ /// │ ◼◼ │ 25 │ /// │ ◻◻ │ 36 │ /// │ ◼◻ │ 78 │ /// └──────┴────┘ /// = /// braille bitmap is /// ◻◼◻◼◼◻◼◻ = 0b01011010 = 0x5A /// 12345678 /// ``` /// and braille character is bitmap + 0x2800 (Braille block's position in Unicode) /// ```text /// 0x5A + 0x2800 = 0x285A = '⡚' /// ``` /// /// Why three columns? I originally wrote this for X-Face bitmaps, which are 48x48 pixels. pub struct BraillePixelIter { columns: [Braille16bitColumn; 3], column_ptr: usize, } impl From<&[u16]> for BraillePixelIter { fn from(from: &[u16]) -> Self { BraillePixelIter { columns: [ Braille16bitColumn { bitmaps: ( from[0].swap_bytes().reverse_bits(), from[3].swap_bytes().reverse_bits(), from[6].swap_bytes().reverse_bits(), from[9].swap_bytes().reverse_bits(), ), bitcolumn: 1, }, Braille16bitColumn { bitmaps: ( from[1].swap_bytes().reverse_bits(), from[4].swap_bytes().reverse_bits(), from[7].swap_bytes().reverse_bits(), from[10].swap_bytes().reverse_bits(), ), bitcolumn: 1, }, Braille16bitColumn { bitmaps: ( from[2].swap_bytes().reverse_bits(), from[5].swap_bytes().reverse_bits(), from[8].swap_bytes().reverse_bits(), from[11].swap_bytes().reverse_bits(), ), bitcolumn: 1, }, ], column_ptr: 0, } } } impl Iterator for BraillePixelIter { type Item = char; fn next(&mut self) -> Option { if self.columns[self.column_ptr].bitcolumn == 17 { if self.column_ptr == 2 { return None; } self.column_ptr += 1; } let Braille16bitColumn { ref bitmaps, ref mut bitcolumn, } = &mut self.columns[self.column_ptr]; /* First bitcolumn out of two (braille is 2x4) */ let mut bits: u16 = 0x1 & (bitmaps.0.rotate_left(*bitcolumn)); // * 0x1; bits += (0x1 & (bitmaps.1.rotate_left(*bitcolumn))) * 0x2; bits += (0x1 & (bitmaps.2.rotate_left(*bitcolumn))) * 0x4; bits += (0x1 & (bitmaps.3.rotate_left(*bitcolumn))) * 0x40; /* Second bitcolumn */ *bitcolumn += 1; bits += (0x1 & (bitmaps.0.rotate_left(*bitcolumn))) * 0x8; bits += (0x1 & (bitmaps.1.rotate_left(*bitcolumn))) * 0x10; bits += (0x1 & (bitmaps.2.rotate_left(*bitcolumn))) * 0x20; bits += (0x1 & (bitmaps.3.rotate_left(*bitcolumn))) * 0x80; *bitcolumn += 1; /* The Braille Patterns block spans the entire [U+2800, U+28FF] range and bits is a * 16bit integer ∈ [0x00, 0xFF] so this is guaranteed to be a Unicode char */ Some(unsafe { std::char::from_u32_unchecked(bits as u32 + 0x2800) }) } } }