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83 lines
2.5 KiB
83 lines
2.5 KiB
9 years ago
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var path = require('path')
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exports.defaultOptions = {
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workerPath: path.join(__dirname, 'worker.js'),
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langPath: 'http://cdn.rawgit.com/naptha/tessdata/gh-pages/3.02/',
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}
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var fork = require('child_process').fork;
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var fs = require('fs')
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exports.spawnWorker = function spawnWorker(instance, workerOptions){
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var cp = fork(workerOptions.workerPath);
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cp.on('message', function(packet){
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instance._recv(packet)
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})
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return cp;
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}
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exports.terminateWorker = function(instance){
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instance.worker.kill()
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}
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exports.sendPacket = function sendPacket(instance, packet){
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loadImage(packet.payload.image, function(img){
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packet.payload.image = img
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instance.worker.send(packet)
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})
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}
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function loadImage(image, cb){
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if(typeof image === 'string'){
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fs.readFile(image, function(err, buffer){
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loadImage(buffer, cb)
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})
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return
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}else if(image instanceof Buffer){
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var fileType = require('file-type');
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var mime = fileType(image).mime
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if(mime === 'image/png'){
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var PNGReader = require('png.js');
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var reader = new PNGReader(image);
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reader.parse(function(err, png){
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if (err) throw err;
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var image = {
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width: png.getWidth(),
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height: png.getHeight()
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}
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image.data = new Uint8Array(image.width * image.height * 4)
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for(var j = 0; j < image.height; j++){
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for(var i = 0; i < image.width; i++){
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var offset = 4 * (i + j * image.width),
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pix = png.getPixel(i, j);
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image.data[offset] = pix[0]
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image.data[offset + 1] = pix[1]
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image.data[offset + 2] = pix[2]
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image.data[offset + 3] = pix[3];
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}
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}
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// console.log(image)
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loadImage(image, cb)
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});
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return
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}else if(mime === 'image/jpeg'){
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var jpeg = require('jpeg-js');
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loadImage(jpeg.decode(image), cb)
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return
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}
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// TODO: support for TIFF, NetPBM, BMP, etc.
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}
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// node uses json.stringify for ipc which means we need to turn
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// fancy arrays into raw arrays
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if(image && image.data && image.data.length && !Array.isArray(image.data)){
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image.data = Array.from(image.data)
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return loadImage(image, cb)
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}
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cb(image)
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}
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