100 lines
2.3 KiB
JavaScript
100 lines
2.3 KiB
JavaScript
'use strict';
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var hasSyncZlib = true;
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var zlib = require('zlib');
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var inflateSync = require('./sync-inflate');
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if (!zlib.deflateSync) {
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hasSyncZlib = false;
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}
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var SyncReader = require('./sync-reader');
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var FilterSync = require('./filter-parse-sync');
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var Parser = require('./parser');
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var bitmapper = require('./bitmapper');
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var formatNormaliser = require('./format-normaliser');
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module.exports = function(buffer, options) {
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if (!hasSyncZlib) {
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throw new Error('To use the sync capability of this library in old node versions, please pin pngjs to v2.3.0');
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}
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var err;
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function handleError(_err_) {
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err = _err_;
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}
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var metaData;
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function handleMetaData(_metaData_) {
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metaData = _metaData_;
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}
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function handleTransColor(transColor) {
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metaData.transColor = transColor;
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}
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function handlePalette(palette) {
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metaData.palette = palette;
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}
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var gamma;
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function handleGamma(_gamma_) {
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gamma = _gamma_;
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}
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var inflateDataList = [];
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function handleInflateData(inflatedData) {
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inflateDataList.push(inflatedData);
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}
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var reader = new SyncReader(buffer);
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var parser = new Parser(options, {
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read: reader.read.bind(reader),
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error: handleError,
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metadata: handleMetaData,
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gamma: handleGamma,
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palette: handlePalette,
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transColor: handleTransColor,
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inflateData: handleInflateData
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});
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parser.start();
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reader.process();
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if (err) {
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throw err;
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}
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//join together the inflate datas
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var inflateData = Buffer.concat(inflateDataList);
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inflateDataList.length = 0;
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var inflatedData;
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if (metaData.interlace) {
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inflatedData = zlib.inflateSync(inflateData);
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} else {
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var rowSize = ((metaData.width * metaData.bpp * metaData.depth + 7) >> 3) + 1;
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var imageSize = rowSize * metaData.height;
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inflatedData = inflateSync(inflateData, { chunkSize: imageSize, maxLength: imageSize });
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}
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inflateData = null;
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if (!inflatedData || !inflatedData.length) {
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throw new Error('bad png - invalid inflate data response');
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}
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var unfilteredData = FilterSync.process(inflatedData, metaData);
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inflateData = null;
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var bitmapData = bitmapper.dataToBitMap(unfilteredData, metaData);
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unfilteredData = null;
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var normalisedBitmapData = formatNormaliser(bitmapData, metaData);
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metaData.data = normalisedBitmapData;
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metaData.gamma = gamma || 0;
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return metaData;
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};
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