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Decaffeinate BrailleBuffer class
This commit is contained in:
Christian Paul
parent
9d9ef31f7b
commit
d27e086758
@ -1,156 +0,0 @@
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###
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termap - Terminal Map Viewer
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by Michael Strassburger <codepoet@cpan.org>
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Simple pixel to barille character mapper
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Implementation inspired by node-drawille (https://github.com/madbence/node-drawille)
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* added color support
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* added text label support
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* general optimizations
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Will either be merged into node-drawille or become an own module at some point
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###
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stringWidth = require 'string-width'
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config = require './config'
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utils = require './utils'
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module.exports = class BrailleBuffer
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brailleMap: [[0x1, 0x8],[0x2, 0x10],[0x4, 0x20],[0x40, 0x80]]
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asciiMap:
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# "▬": [2+32, 4+64]
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# "¯": [1+16]
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"▀": [1+2+16+32]
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"▄": [4+8+64+128]
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"■": [2+4+32+64]
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"▌": [1+2+4+8]
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"▐": [16+32+64+128]
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# "▓": [1+4+32+128, 2+8+16+64]
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"█": [255]
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pixelBuffer: null
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charBuffer: null
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foregroundBuffer: null
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backgroundBuffer: null
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asciiToBraille: []
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globalBackground: null
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termReset: "\x1B[39;49m"
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constructor: (@width, @height) ->
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size = @width*@height/8
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@pixelBuffer = new Buffer size
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@foregroundBuffer = new Buffer size
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@backgroundBuffer = new Buffer size
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@_mapBraille()
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@clear()
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clear: ->
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@pixelBuffer.fill 0
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@charBuffer = []
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@foregroundBuffer.fill 0
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@backgroundBuffer.fill 0
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setGlobalBackground: (@globalBackground) ->
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setBackground: (x, y, color) ->
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return unless 0 <= x < @width and 0 <= y < @height
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idx = @_project x, y
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@backgroundBuffer[idx] = color
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setPixel: (x, y, color) ->
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@_locate x, y, (idx, mask) =>
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@pixelBuffer[idx] |= mask
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@foregroundBuffer[idx] = color
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unsetPixel: (x, y) ->
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@_locate x, y, (idx, mask) =>
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@pixelBuffer[idx] &= ~mask
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_project: (x, y) ->
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(x>>1) + (@width>>1)*(y>>2)
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_locate: (x, y, cb) ->
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return unless 0 <= x < @width and 0 <= y < @height
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idx = @_project x, y
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mask = @brailleMap[y&3][x&1]
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cb idx, mask
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_mapBraille: ->
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@asciiToBraille = [" "]
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masks = []
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for char, bits of @asciiMap
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continue unless bits instanceof Array
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masks.push mask: mask, char: char for mask in bits
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for i in [1..255]
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braille = (i&7) + ((i&56)<<1) + ((i&64)>>3) + (i&128)
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@asciiToBraille[i] = masks.reduce(((best, mask) ->
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covered = utils.population(mask.mask&braille)
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if not best or best.covered < covered
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char: mask.char, covered: covered
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else
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best
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), undefined).char
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_termColor: (foreground, background) ->
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background = background or @globalBackground
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if foreground and background
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"\x1B[38;5;#{foreground};48;5;#{background}m"
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else if foreground
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"\x1B[49;38;5;#{foreground}m"
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else if background
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"\x1B[39;48;5;#{background}m"
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else
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@termReset
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frame: ->
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output = []
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currentColor = null
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skip = 0
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for y in [0...@height/4]
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skip = 0
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for x in [0...@width/2]
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idx = y*@width/2 + x
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if idx and not x
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output.push config.delimeter
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if currentColor isnt colorCode = @_termColor @foregroundBuffer[idx], @backgroundBuffer[idx]
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output.push currentColor = colorCode
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output.push if char = @charBuffer[idx]
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skip += stringWidth(char)-1
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if skip+x >= @width/2
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''
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else
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char
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else
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if not skip
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if config.useBraille
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String.fromCharCode 0x2800+@pixelBuffer[idx]
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else
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@asciiToBraille[@pixelBuffer[idx]]
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else
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skip--
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''
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output.push @termReset+config.delimeter
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output.join ''
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setChar: (char, x, y, color) ->
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return unless 0 <= x < @width and 0 <= y < @height
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idx = @_project x, y
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@charBuffer[idx] = char
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@foregroundBuffer[idx] = color
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writeText: (text, x, y, color, center = true) ->
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x -= text.length/2+1 if center
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@setChar text.charAt(i), x+i*2, y, color for i in [0...text.length]
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211
src/BrailleBuffer.js
Normal file
211
src/BrailleBuffer.js
Normal file
@ -0,0 +1,211 @@
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/*
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termap - Terminal Map Viewer
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by Michael Strassburger <codepoet@cpan.org>
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Simple pixel to barille character mapper
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Implementation inspired by node-drawille (https://github.com/madbence/node-drawille)
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* added color support
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* added text label support
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* general optimizations
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Will either be merged into node-drawille or become an own module at some point
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*/
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'use strict';
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const stringWidth = require('string-width');
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const config = require('./config');
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const utils = require('./utils');
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const asciiMap = {
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// '▬': [2+32, 4+64],
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// '¯': [1+16],
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'▀': [1+2+16+32],
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'▄': [4+8+64+128],
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'■': [2+4+32+64],
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'▌': [1+2+4+8],
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'▐': [16+32+64+128],
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// '▓': [1+4+32+128, 2+8+16+64],
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'█': [255],
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};
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const termReset = '\x1B[39;49m';
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class BrailleBuffer {
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constructor(width, height) {
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this.brailleMap = [[0x1, 0x8],[0x2, 0x10],[0x4, 0x20],[0x40, 0x80]]
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this.pixelBuffer = null;
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this.charBuffer = null;
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this.foregroundBuffer = null;
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this.backgroundBuffer = null;
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this.asciiToBraille = [];
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this.globalBackground = null;
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this.width = width;
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this.height = height;
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const size = width*height/8;
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this.pixelBuffer = new Buffer(size);
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this.foregroundBuffer = new Buffer(size);
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this.backgroundBuffer = new Buffer(size);
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this._mapBraille();
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this.clear();
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}
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clear() {
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this.pixelBuffer.fill(0);
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this.charBuffer = [];
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this.foregroundBuffer.fill(0);
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this.backgroundBuffer.fill(0);
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}
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setGlobalBackground(background) {
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this.globalBackground = background;
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}
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setBackground(x, y, color) {
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if (0 <= x && x < this.width && 0 <= y && y < this.height) {
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idx = this._project(x, y);
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this.backgroundBuffer[idx] = color;
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}
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}
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setPixel(x, y, color) {
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this._locate(x, y, (idx, mask) => {
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this.pixelBuffer[idx] |= mask;
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this.foregroundBuffer[idx] = color;
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});
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}
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unsetPixel(x, y) {
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this._locate(x, y, (idx, mask) => {
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this.pixelBuffer[idx] &= ~mask;
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});
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}
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_project(x, y) {
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return (x>>1) + (this.width>>1)*(y>>2);
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}
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_locate(x, y, cb) {
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if (!((0 <= x && x < this.width) && (0 <= y && y < this.height))) {
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return;
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}
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const idx = this._project(x, y);
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const mask = this.brailleMap[y & 3][x & 1];
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return cb(idx, mask);
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}
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_mapBraille() {
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this.asciiToBraille = [' '];
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const masks = [];
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for (const char in asciiMap) {
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const bits = asciiMap[char];
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if (!(bits instanceof Array)) continue;
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for (const mask of bits) {
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masks.push({
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mask: mask,
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char: char,
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});
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}
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}
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//TODO Optimize this part
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var i, k;
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const results = [];
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for (i = k = 1; k <= 255; i = ++k) {
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const braille = (i & 7) + ((i & 56) << 1) + ((i & 64) >> 3) + (i & 128);
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results.push(this.asciiToBraille[i] = masks.reduce((function(best, mask) {
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const covered = utils.population(mask.mask & braille);
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if (!best || best.covered < covered) {
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return {
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char: mask.char,
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covered: covered,
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};
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} else {
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return best;
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}
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}), void 0).char);
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}
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return results;
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}
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_termColor(foreground, background) {
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background |= this.globalBackground;
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if (foreground && background) {
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return `\x1B[38;5;${foreground};48;5;${background}m`;
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} else if (foreground) {
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return `\x1B[49;38;5;${foreground}m`;
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} else if (background) {
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return `\x1B[39;48;5;${background}m`;
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} else {
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return termReset;
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}
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}
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frame() {
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const output = [];
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let currentColor = null;
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let skip = 0;
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for (let y = 0; y < this.height/4; y++) {
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skip = 0;
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for (let x = 0; x < this.width/2; x++) {
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const idx = y*this.width/2 + x;
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if (idx && !x) {
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output.push(config.delimeter);
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}
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const colorCode = this._termColor(this.foregroundBuffer[idx], this.backgroundBuffer[idx]);
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if (currentColor !== colorCode) {
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output.push(currentColor = colorCode);
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}
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const char = this.charBuffer[idx];
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if (char) {
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skip += stringWidth(char)-1;
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if (skip+x < this.width/2) {
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output.push(char);
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}
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} else {
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if (!skip) {
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if (config.useBraille) {
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output.push(String.fromCharCode(0x2800+this.pixelBuffer[idx]));
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} else {
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output.push(this.asciiToBraille[this.pixelBuffer[idx]]);
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}
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} else {
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skip--;
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}
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}
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}
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}
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output.push(termReset+config.delimeter);
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return output.join('');
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}
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setChar(char, x, y, color) {
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if (0 <= x && x < this.width && 0 <= y && y < this.height) {
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const idx = this._project(x, y);
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this.charBuffer[idx] = char;
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this.foregroundBuffer[idx] = color;
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}
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}
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writeText(text, x, y, color, center = true) {
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if (center) {
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x -= text.length/2+1;
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}
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for (let i = 0; i < text.length; i++) {
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this.setChar(text.charAt(i), x+i*2, y, color);
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}
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}
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}
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module.exports = BrailleBuffer;
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