# All files png.js

54.17% Statements 52/96
41.18% Branches 14/34
56.25% Functions 9/16
56.52% Lines 52/92

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     "use strict";

    let util = require("util");
    let Stream = require("stream");
    let Parser = require("./parser-async");
    let Packer = require("./packer-async");
    let PNGSync = require("./png-sync");

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

      options = options || {}; // eslint-disable-line no-param-reassign

      // coerce pixel dimensions to integers (also coerces undefined -> 0):
      this.width = options.width | 0;
      this.height = options.height | 0;

      this.data =
        this.width > 0 && this.height > 0
          ? Buffer.alloc(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 () {
      Iif (!this.data || !this.data.length) {
        this.emit("error", "No data provided");
        return this;
      }

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

      return this;
    };

    PNG.prototype.parse = function (data, callback) {
      if (callback) {
        let onParsed, onError;

        onParsed = function (parsedData) {
          this.removeListener("error", onError);

          this.data = parsedData;
          callback(null, this);
        }.bind(this);

        onError = function (err) {
          this.removeListener("parsed", onParsed);

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

        this.once("parsed", onParsed);
        this.once("error", onError);
      }

      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, srcX, srcY, width, height, deltaX, deltaY) {
      // eslint-disable-line max-params
      // coerce pixel dimensions to integers (also coerces undefined -> 0):
      /* eslint-disable no-param-reassign */
      srcX |= 0;
      srcY |= 0;
      width |= 0;
      height |= 0;
      deltaX |= 0;
      deltaY |= 0;
      /* eslint-enable no-param-reassign */

      if (
        srcX > src.width ||
        srcY > src.height ||
        srcX + width > src.width ||
        srcY + height > src.height
      ) {
        throw new Error("bitblt reading outside image");
      }

      if (
        deltaX > dst.width ||
        deltaY > dst.height ||
        deltaX + width > dst.width ||
        deltaY + height > dst.height
      ) {
        throw new Error("bitblt writing outside image");
      }

      for (let y = 0; y < height; y++) {
        src.data.copy(
          dst.data,
          ((deltaY + y) * dst.width + deltaX) << 2,
          ((srcY + y) * src.width + srcX) << 2,
          ((srcY + y) * src.width + srcX + width) << 2
        );
      }
    };

    PNG.prototype.bitblt = function (
      dst,
      srcX,
      srcY,
      width,
      height,
      deltaX,
      deltaY
    ) {
      // eslint-disable-line max-params

      PNG.bitblt(this, dst, srcX, srcY, width, height, deltaX, deltaY);
      return this;
    };

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

            for (let i = 0; i < 3; i++) {
              let 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);
    };