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index.js
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index.js
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'use strict';
var Canvas = require('canvas');
var Image = Canvas.Image;
var ColorThief = require('color-thief');
var colors = require('colors');
var drawText = require('node-canvas-text').default;
var font = require('random-google-font');
var fs = require('fs');
var opentype = require('opentype.js');
var promise = require('promise');
var request = require('request');
var sizeOf = require('image-size');
var tinycolor = require('tinycolor2');
const pIf = require('p-if');
var settings = {};
var defaults = {
"padding": 10,
"file": "",
"mute": false
}
function getTextBox(text) {
if (!settings.mute) { console.log(`Deciding text-box dimensions...`.dim); }
var ws = ((50 / 100) * (settings.dimensions.width - settings.padding));
var w = Math.floor((Math.random() * ((settings.dimensions.width - settings.padding) - ws + 1)) + ws);
var h = Math.floor((Math.random() * ((settings.dimensions.height - settings.padding) / 3.5) + 10));
var x = Math.floor((Math.random() * ((settings.dimensions.width - settings.padding) - w + 1)) + settings.padding);
var y = Math.floor((Math.random() * ((settings.dimensions.height - settings.padding) - h + 1)) + settings.padding);
if (!settings.mute) { console.log(`Text Box: w:${w} h:${h} x:${x} y:${y}`.bold); }
return {width:w,height:h,x:x,y:y};
}
function getFont() {
if (!settings.mute) { console.log(`Deciding font...`.dim); }
return new Promise(function (fulfill, reject){
font.get().then(function(f){
f[0].local[0] = f[0].local[0].replace(/^\'+|\'+$/g, '');
request.get({encoding:'binary', url:f[0].url.ttf}, function(error, response, body){
if (!error) {
if (!settings.mute) { console.log(`Font: ${f[0].local[0]}`.bold); }
var buffer = new Buffer(body, 'binary');
fulfill([bufferToArrayBuffer(buffer), f[0]]);
} else { reject(error); }
})
}).fail(function(error) { reject(error); });
});
}
function bufferToArrayBuffer(buffer) {
var ab = new ArrayBuffer(buffer.length);
var view = new Uint8Array(ab);
for (var i = 0; i < buffer.length; ++i) {
view[i] = buffer[i];
}
return ab;
}
function getImgPart(imgBuffer, box) {
if (!settings.mute) { console.log('Getting text-box area...'.dim); }
var canvas = new Canvas(box.width, box.height);
var ctx = canvas.getContext('2d');
var img = new Image;
img.src = imgBuffer;
ctx.drawImage(img, -box.x, -box.y);
return canvas.toBuffer();
}
function getTxtColor(imgBuffer) {
if (!settings.mute) { console.log(`Deciding text color...`.dim); }
var colorThief = new ColorThief();
var domColor = colorThief.getColor(imgBuffer);
function decideColor(domColor) {
var color = tinycolor.random().toHexString();
if (!tinycolor.isReadable(domColor, color, {level: "AAA", size: "large"})) {
return decideColor(domColor);
} else {
return color;
}
}
var color = decideColor(domColor);
if (!settings.mute) { console.log(`Text color: ${color}`.bold); }
return color;
}
function writeText(imgBuffer, text, font, color, box) {
var canvas = new Canvas(settings.dimensions.width, settings.dimensions.height);
var ctx = canvas.getContext('2d');
var img = new Image;
var opts = { textFillStyle: color };
img.src = imgBuffer;
ctx.drawImage(img, 0, 0, settings.dimensions.width, settings.dimensions.height);
if (!settings.mute) { console.log(`Writing text to image...`.dim); }
drawText(ctx, text, font, box, opts);
return canvas;
}
function saveImage(stream, file) {
if (!settings.mute) { console.log(`Saving image...`.dim); }
return new Promise(function (fulfill, reject){
var out = fs.createWriteStream(file);
try { stream.pipe(out); }
catch(e) { reject(e); }
finally {
if (!settings.mute) { console.log(`Image saved to ${settings.file}`.bold); }
fulfill();
}
});
}
module.exports = function(image, text, options, cb) {
if (!cb && options && typeof options !== 'object') {
cb = options;
options = {};
} else if (!options) { options = {}; }
settings = Object.assign({}, defaults, options);
if (!cb) { var cb = function(e, i, d) { if (e) { console.log(new Error(e)); } } }
if (!image instanceof Buffer) { image = fs.readFileSync(image); }
settings.dimensions = sizeOf(image);
getFont()
.then(function(r){
var font = opentype.parse(r[0]);
var fontName = r[1].local[0];
var fontUrl = r[1].url.ttf;
var box = getTextBox(text);
var boxImg = getImgPart(image, box);
var color = getTxtColor(boxImg);
var img = writeText(image, text, font, color, box);
image = img.toBuffer();
return [{
image: image,
font: fontName,
color: color,
width: settings.dimensions.width,
height: settings.dimensions.height,
box: box
}, img];
})
.then(pIf(settings.file !== "", function(r){
var stream = r[1].pngStream();
return saveImage(stream, settings.file)
.then(function(s){ return r; })
}))
.then(function(r){
cb(null, r[0]);
})
.catch(function(e){
cb(e);
});
};