Self of web Worker

• A self object, which is the global object representing the worker in this scope.
• The translation of the Self object is unknown.

1 //Call the Invertimage method, this worker receives a message from the calling script.2 //The ' Self ' object contains the-Methods a Web worker can access apart from those it3 //defines and creates itself4 //The Invertimage method is called when the worker receives a message from the script that made the call. The "Self" object contains a method that the Web worker can access only those methods that are defined and created by the Web worker itself. 5Self.addeventlistener ("message", Invertimage,false);6 7 //Define a function to take an image and invert it, pixel by pixel, using it raw data8 //defines a function that is used as the raw data to receive an image, in pixels to perform the inverse operation on a granular basis. 9 functionInvertimage (e) {Ten  One     //The ' data ' property of the ' message ' event contains the pixel data passed from A     //The calling script -     //The "Data" property of the "message" event contains the pixel data contained in the script from which the call was made.  -     varMessage =E.data, the  -         //The ' data ' property of the message passed contains the RAW image pixel data -         //The "data" attribute in the sent message contains the pixel data of the original image.  -Imagepixels =Message.data, +x = 0, -Len =imagepixels.length; +  A     //Loop through each pixel, inverting its value within the original pixel data array. at     //Pixel data is arranged in groups of 4 values, representing the red, green, blue, and -     //Opacity values of each of the visible screen pixel. We therefore loop through in jumps of 4 -     //On each iteration -     //loops through each pixel so that the values held in the array of the original pixel data are inverted. The pixel data is grouped by 4 values, representing the red, green, blue, and transparency values of the pixels seen on the screen, respectively. Therefore, the addend of each iteration of the loop is 4.  -      for(; x < len; x + = 4) { -  in         //to invert a pixel's value, subtract it from the maximum possible value, which is 255 -         //to reverse a pixel value, you can subtract it with the maximum possible value (that is, 255).  toIMAGEPIXELS[X] = 255-Imagepixels[x]; +Imagepixels[x + 1] = 255-imagepixels[x + 1]; -Imagepixels[x + 2] = 255-imagepixels[x + 2]; the     } *  $     //Finally, post a message containing the updated pixel data back to the calling scriptPanax Notoginseng     //Finally, the message containing the updated pixel data is sent back to the script that made the call.  - self.postmessage (message); the}

Self of web Worker