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Directory : /proc/self/root/home/saurabh/.npm/_npx/249ca9fcd30c476a/node_modules/pngjs/lib/
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| Current File : //proc/self/root/home/saurabh/.npm/_npx/249ca9fcd30c476a/node_modules/pngjs/lib/packer-sync.js |
'use strict';
var hasSyncZlib = true;
var zlib = require('zlib');
if (!zlib.deflateSync) {
hasSyncZlib = false;
}
var constants = require('./constants');
var Packer = require('./packer');
module.exports = function(metaData, opt) {
if (!hasSyncZlib) {
throw new Error('To use the sync capability of this library in old node versions, please pin pngjs to v2.3.0');
}
var options = opt || {};
var packer = new Packer(options);
var chunks = [];
// Signature
chunks.push(new Buffer(constants.PNG_SIGNATURE));
// Header
chunks.push(packer.packIHDR(metaData.width, metaData.height));
if (metaData.gamma) {
chunks.push(packer.packGAMA(metaData.gamma));
}
var filteredData = packer.filterData(metaData.data, metaData.width, metaData.height);
// compress it
var compressedData = zlib.deflateSync(filteredData, packer.getDeflateOptions());
filteredData = null;
if (!compressedData || !compressedData.length) {
throw new Error('bad png - invalid compressed data response');
}
chunks.push(packer.packIDAT(compressedData));
// End
chunks.push(packer.packIEND());
return Buffer.concat(chunks);
};
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