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var MircColor = (function(){
var COLORS = [
[255,255,255],
[0,0,0],
[0,0,127],
[0,147,0],
[255,0,0],
[127,0,0],
[156,0,156],
[252,127,0],
[255,255,0],
[0,252,0],
[0,147,147],
[0,255,255],
[0,0,252],
[255,0,255],
[127,127,127],
[210,210,210]
]
var HUES = [
[255,255,255],
[0,0,0],
[0,0,127],
[0,147,0],
[255,0,0],
[127,0,0],
[156,0,156],
[252,127,0],
[255,255,0],
[0,252,0],
[0,147,147],
[0,255,255],
[0,0,252],
[255,0,255],
null,
null,
]
var GRAYS = [
[255,255,255],
[0,0,0],
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
[127,127,127],
[210,210,210]
]
function closest_to(pixel){
return COLORS.reduce(function(prev, curr, index) {
var d = distance(pixel, curr)
if (prev[0] > d) {
prev[0] = d
prev[1] = index
}
return prev
}, [Infinity, -1])[1]
}
function distance(u, v){
if (! v) return Math.Infinity
var r = u[0] - v[0]
var g = u[1] - v[1]
var b = u[2] - v[2]
return Math.sqrt(r*r+g*g+b*b)
}
function fromImageData (pixels, cb){
var rows = [],
pixel = new Array (4),
data = pixels.data,
t
for (var i = 0, h = pixels.height; i < h; i++) {
var row = []
rows.push(row)
for (var j = 0, w = pixels.width; j < w; j++) {
t = (i*w+j)*4
pixel[0] = data[t]
pixel[1] = data[t+1]
pixel[2] = data[t+2]
pixel[3] = data[t+3]
row[j] = closest_to(pixel)
}
}
if (! cb) return rows
else cb (rows)
}
function neighbor (canvas, ctx, img) {
var scratch = document.createElement("canvas")
var scratchCtx = scratch.getContext('2d')
scratch.width = img.naturalWidth
scratch.height = img.naturalHeight
scratchCtx.drawImage(img, 0, 0, img.naturalWidth, img.naturalHeight)
var srcImageData = scratchCtx.getImageData(0,0,scratch.width,scratch.height)
var destImageData = ctx.createImageData(canvas.width,canvas.height)
var src = srcImageData.data, dest = destImageData.data
var dt, dw = destImageData.width, dh = destImageData.height
var st, sw = srcImageData.width, sh = srcImageData.height
for (var i = 0; i < dh; i++) {
for (var j = 0; j < dw; j++) {
var y = i * sh/dh
var x = j * sw/dw
dt = ((i*dw) + j) * 4
st = Math.floor( Math.floor(y)*sw + x ) * 4
dest[dt] = src[st]
dest[dt+1] = src[st+1]
dest[dt+2] = src[st+2]
dest[dt+3] = src[st+3]
}
}
return destImageData
}
var img = new Image ()
function fromUrl (url, cb, opt) {
img.onload = function(){
var canvas = document.createElement("canvas"), ctx = canvas.getContext('2d'), pixels
if (opt.width) {
canvas.width = opt.width
if (opt.height) {
canvas.height = opt.height
} else if (opt.ratio) {
canvas.height = opt.width / opt.ratio
} else {
canvas.height = (img.naturalHeight * width / img.naturalWidth) / 2
}
}
else {
canvas.width = img.naturalWidth * 2
canvas.height = img.naturalHeight
}
if (opt.neighbor) {
pixels = neighbor(canvas, ctx, img)
}
else {
ctx.drawImage(img,0,0,img.naturalWidth,img.naturalHeight,0,0,canvas.width,canvas.height)
pixels = ctx.getImageData(0,0,canvas.width,canvas.height)
}
fromImageData(pixels, cb)
}
if (img.src == url) { return img.onload() }
img.src = url
if (img.complete) { return img.onload() }
}
function ascii (rows) {
var lines = rows.map(function(str){
return str.map(function(index){ return "\\x03" + index + "," + index + "x\\x03" }).join("")
}).join("\\n")
var txt = '/exec -out printf "' + lines + '"\n'
return txt
}
function asciiFromUrl (url, cb, opt) {
fromUrl(url, function(rows){
cb(ascii(rows), rows)
}, width)
}
function stringFromUrl (url, cb, opt) {
fromUrl(url, function(rows){
cb(rows.map(function(str){
return str.map(function(index){ return "\C-c" + index + "," + index + "x\C-c" }).join("")
}).join("\n"))
}, width)
}
return {
colors: COLORS,
hues: HUES,
grays: GRAYS,
closest_to: closest_to,
distance: distance,
fromUrl: fromUrl,
fromImageData: fromImageData,
stringFromUrl: stringFromUrl,
asciiFromUrl: asciiFromUrl,
ascii: ascii,
neighbor: neighbor,
}
})()
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