# Code coverage report for lib\png.js

## Statements: 60.26% (47 / 78) Branches: 38.89% (14 / 36) Functions: 56.25% (9 / 16) Lines: 61.84% (47 / 76) Ignored: none

All files » lib/ » png.js

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    1// Copyright (c) 2012 Kuba Niegowski
    //
    // Permission is hereby granted, free of charge, to any person obtaining a copy
    // of this software and associated documentation files (the "Software"), to deal
    // in the Software without restriction, including without limitation the rights
    // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    // copies of the Software, and to permit persons to whom the Software is
    // furnished to do so, subject to the following conditions:
    //
    // The above copyright notice and this permission notice shall be included in
    // all copies or substantial portions of the Software.
    //
    // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    // THE SOFTWARE.

    'use strict';

    var util = require('util'),
        Stream = require('stream'),
        Parser = require('./parser-async'),
        Packer = require('./packer'),
      PNGSync = require('./png-sync');

    var PNG = exports.PNG = function(options) {
        Stream.call(this);

        options = options || {};

        this.width = options.width || 0;
        this.height = options.height || 0;

        this.data = this.width > 0 && this.height > 0
                ? new Buffer(4 * this.width * this.height) : null;

    	  Iif(options.fill && this.data){this.data.fill(0)};

        this.gamma = 0;
        this.readable = this.writable = true;

        this._parser = new Parser(options || {});

        this._parser.on('error', this.emit.bind(this, 'error'));
        this._parser.on('close', this._handleClose.bind(this));
        this._parser.on('metadata', this._metadata.bind(this));
        this._parser.on('gamma', this._gamma.bind(this));
        this._parser.on('parsed', function(data) {
            this.data = data;
            this.emit('parsed', data);
        }.bind(this));

        this._packer = new Packer(options);
        this._packer.on('data', this.emit.bind(this, 'data'));
        this._packer.on('end', this.emit.bind(this, 'end'));
        this._parser.on('close', this._handleClose.bind(this));
        this._packer.on('error', this.emit.bind(this, 'error'));

    };
    util.inherits(PNG, Stream);

    PNG.sync = PNGSync;

    PNG.prototype.pack = function() {

        process.nextTick(function() {
            this._packer.pack(this.data, this.width, this.height);
        }.bind(this));

        return this;
    };

    PNG.prototype.parse = function(data, callback) {

        if (callback) {
            var onParsed = null, onError = null;

            this.once('parsed', onParsed = function(data) {
                this.removeListener('error', onError);

                this.data = data;
                callback(null, this);

            }.bind(this));

            this.once('error', onError = function(err) {
                this.removeListener('parsed', onParsed);

                callback(err, null);
            }.bind(this));
        }

        this.end(data);
        return this;
    };

    PNG.prototype.write = function(data) {
        this._parser.write(data);
        return true;
    };

    PNG.prototype.end = function(data) {
        this._parser.end(data);
    };

    PNG.prototype._metadata = function(metadata) {
        this.width = metadata.width;
        this.height = metadata.height;

        this.emit('metadata', metadata);
    };

    PNG.prototype._gamma = function(gamma) {
        this.gamma = gamma;
    };

    PNG.prototype._handleClose = function() {
        Iif (!this._parser.writable && !this._packer.readable)
            this.emit('close');
    };

    PNG.bitblt = function(src, dst, sx, sy, w, h, dx, dy) {

        if (sx > src.width || sy > src.height
          || sx + w > src.width || sy + h > src.height)
            throw new Error('bitblt reading outside image');
        if (dx > dst.width || dy > dst.height
          || dx + w > dst.width || dy + h > dst.height)
            throw new Error('bitblt writing outside image');

        for (var y = 0; y < h; y++) {
            src.data.copy(dst.data,
              ((dy + y) * dst.width + dx) << 2,
              ((sy + y) * src.width + sx) << 2,
              ((sy + y) * src.width + sx + w) << 2
            );
        }
    };

    PNG.prototype.bitblt = function(dst, sx, sy, w, h, dx, dy) {

        PNG.bitblt(this, dst, sx, sy, w, h, dx, dy);
        return this;
    };

    PNG.adjustGamma = function(src) {
        if (src.gamma) {
            for (var y = 0; y < src.height; y++) {
                for (var x = 0; x < src.width; x++) {
                    var idx = (src.width * y + x) << 2;

                    for (var i = 0; i < 3; i++) {
                        var sample = src.data[idx + i] / 255;
                        sample = Math.pow(sample, 1 / 2.2 / src.gamma);
                        src.data[idx + i] = Math.round(sample * 255);
                    }
                }
            }
            src.gamma = 0;
        }
    };

    PNG.prototype.adjustGamma = function() { PNG.adjustGamma(this); };