packages/plugin-flip/src/index.js
function flipFn(horizontal, vertical, cb) {
  if (typeof horizontal !== 'boolean' || typeof vertical !== 'boolean')
    return throwError.call(
      this,
      'horizontal and vertical must be Booleans',
      cb
    );

  if (horizontal && vertical) {
    // shortcut
    return this.rotate(180, true, cb);
  }

  const bitmap = Buffer.alloc(this.bitmap.data.length);
  this.scanQuiet(0, 0, this.bitmap.width, this.bitmap.height, function(
    x,
    y,
    idx
  ) {
    const _x = horizontal ? this.bitmap.width - 1 - x : x;
    const _y = vertical ? this.bitmap.height - 1 - y : y;
    const _idx = (this.bitmap.width * _y + _x) << 2;
    const data = this.bitmap.data.readUInt32BE(idx);

    bitmap.writeUInt32BE(data, _idx);
  });

  this.bitmap.data = Buffer.from(bitmap);

  if (isNodePattern(cb)) {
    cb.call(this, null, this);
  }

  return this;
}
function flipFn(horizontal, vertical, cb) {
  if (typeof horizontal !== 'boolean' || typeof vertical !== 'boolean')
    return throwError.call(
      this,
      'horizontal and vertical must be Booleans',
      cb
    );

  if (horizontal && vertical) {
    // shortcut
    return this.rotate(180, true, cb);
  }

  const bitmap = Buffer.alloc(this.bitmap.data.length);
  this.scanQuiet(0, 0, this.bitmap.width, this.bitmap.height, function(
    x,
    y,
    idx
  ) {
    const _x = horizontal ? this.bitmap.width - 1 - x : x;
    const _y = vertical ? this.bitmap.height - 1 - y : y;
    const _idx = (this.bitmap.width * _y + _x) << 2;
    const data = this.bitmap.data.readUInt32BE(idx);

    bitmap.writeUInt32BE(data, _idx);
  });

  this.bitmap.data = Buffer.from(bitmap);

  if (isNodePattern(cb)) {
    cb.call(this, null, this);
  }

  return this;
}
function flipFn ( horizontal , vertical , cb ) { if ( typeof horizontal !== 'boolean' || typeof vertical !== 'boolean' ) return throwError . call ( this , 'horizontal and vertical must be Booleans' , cb ) ; if ( horizontal && vertical ) { // shortcut return this . rotate ( 180 , true , cb ) ; } const bitmap = Buffer . alloc ( this . bitmap . data . length ) ; this . scanQuiet ( 0 , 0 , this . bitmap . width , this . bitmap . height , function ( x , y , idx ) { const _x = horizontal ? this . bitmap . width - 1 - x : x ; const _y = vertical ? this . bitmap . height - 1 - y : y ; const _idx = ( this . bitmap . width * _y + _x ) << 2 ; const data = this . bitmap . data . readUInt32BE ( idx ) ; bitmap . writeUInt32BE ( data , _idx ) ; } ) ; this . bitmap . data = Buffer . from ( bitmap ) ; if ( isNodePattern ( cb ) ) { cb . call ( this , null , this ) ; } return this ; }
Flip the image horizontally
@param {boolean} horizontal a Boolean, if true the image will be flipped horizontally
@param {boolean} vertical a Boolean, if true the image will be flipped vertically
@param {function(Error, Jimp)} cb (optional) a callback for when complete
@returns {Jimp} this for chaining of methods
Flip the image horizontally