-
Notifications
You must be signed in to change notification settings - Fork 140
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Merge pull request #4 from thejbw/master
Asynchronous web worker support.
- Loading branch information
Showing
3 changed files
with
167 additions
and
0 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,107 @@ | ||
//This Demonstrates calling the animWorker.js web worker, allowing for non-blocking | ||
//Gif building. | ||
|
||
|
||
function animDelayValue() //Gets a user defined frame delay from user input (dom element), displays current value on dom | ||
{ | ||
var value = new Number(document.getElementById("animDelay").value/1000); | ||
value.toFixed(2); | ||
document.getElementById("animDelayVal").innerHTML = value; | ||
} | ||
animDelayValue(); //initialize delay value display | ||
this.animDelayValue = animDelayValue; //make animDelayValue global | ||
this.gifalizer = function() //function, called from DOM to build gif. | ||
{ | ||
function getAnimScaleFactor() | ||
{ | ||
var autosaveElements = document.getElementsByName("animScale"); //DOM widget to set scale factor to 100%, 50% or 25% | ||
var autosaveValue = "4" | ||
for (var i=0; i < autosaveElements.length; i++) | ||
{ | ||
if (autosaveElements[i].checked) | ||
{ | ||
autosaveValue = autosaveElements[i].value; | ||
break; | ||
} | ||
} | ||
if(autosaveValue == "1") | ||
{ | ||
return 1; | ||
} | ||
if(autosaveValue == "2") | ||
{ | ||
return 2; | ||
} | ||
else | ||
{ | ||
return 4; | ||
} | ||
} | ||
|
||
var delay = document.getElementById("animDelay").value; | ||
var scale = getAnimScaleFactor(); | ||
|
||
var animation_parts = new Array(paintedCanvases.length); | ||
|
||
var worker = new Worker('animWorker.js'); | ||
//worker.onmessage = function(e) | ||
//{ | ||
// console.log(e.data); | ||
//} | ||
|
||
//call web worker. | ||
worker.onmessage = function(e) | ||
{ | ||
//handle stuff, like get the frame_index | ||
var frame_index = e.data["frame_index"]; | ||
var frame_data = e.data["frame_data"]; | ||
animation_parts[frame_index] = frame_data; | ||
console.log(frame_index); | ||
for(var j = 0; j < paintedCanvases.length; j++) | ||
{ | ||
if(animation_parts[j] == null) | ||
{ | ||
return; | ||
} | ||
} | ||
console.log("append"); | ||
//check when everything else is done and then do animation_parts.join('') and have fun | ||
var binary_gif = animation_parts.join(''); | ||
var data_url = 'data:image/gif;base64,'+window.btoa(binary_gif); | ||
|
||
var gifItem = new Image(); | ||
gifItem.src = data_url; | ||
var thumbs = document.getElementById("gifContainer"); | ||
|
||
//nuke all child nodes! | ||
while(thumbs.hasChildNodes()) | ||
{ | ||
thumbs.removeChild(thumbs.lastChild); | ||
} | ||
document.getElementById("gifContainer").appendChild(gifItem); | ||
} | ||
|
||
var imageItems = new Array(); //hacky way to ensure that an arbitrary number of onload events occur. | ||
//paintedCanvases is an array of canvas data generated by a canvas toDataURL calls elsewhere in the parent scope. Replicate this how you wish. | ||
for(var i = 0; i < paintedCanvases.length; i++) | ||
{ | ||
imageItems[i] = new Image(); | ||
imageItems[i].src = paintedCanvases[i]; | ||
imageItems[i].isloaded = false; | ||
imageItems[i].index = i; | ||
imageItems[i].onload = function() | ||
{ | ||
var scratchCanvas = document.createElement("canvas"); | ||
scratchCanvas.width = comicPane.width/scale; | ||
scratchCanvas.height = comicPane.height/scale; | ||
var scratchCanvasContext = scratchCanvas.getContext("2d"); | ||
scratchCanvasContext.fillStyle = "#FFFFFF"; | ||
scratchCanvasContext.fillRect(0,0,scratchCanvas.width, scratchCanvas.height); | ||
scratchCanvasContext.drawImage(this,0,0,scratchCanvas.width,scratchCanvas.height); | ||
var imdata = scratchCanvasContext.getImageData(0,0, scratchCanvas.width, scratchCanvas.height).data; | ||
console.log(this.index); | ||
worker.postMessage({"frame_index": this.index, "delay": delay, "frame_length":paintedCanvases.length-1, "height":scratchCanvas.height, "width":scratchCanvas.width, "imageData":imdata}); //imarray.join(',') | ||
|
||
} | ||
} | ||
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,47 @@ | ||
importScripts('LZWEncoder.js', 'NeuQuant.js', 'GIFEncoder.js'); /* imports three scripts */ | ||
|
||
self.onmessage = function(event) { | ||
//console.log("message!"); | ||
//alert("message"); | ||
//self.postMessage(event.data); | ||
//return; | ||
var frame_index, | ||
frame_length, | ||
height, | ||
width, | ||
delay, | ||
imageData; //get it from onmessage | ||
|
||
frame_index = event.data["frame_index"]; | ||
frame_length = event.data["frame_length"]; | ||
height = event.data["height"]; | ||
width = event.data["width"]; | ||
imageData = event.data["imageData"]; | ||
delay = event.data["delay"]; | ||
|
||
var encoder = new GIFEncoder(); //create a new GIFEncoder for every new job | ||
encoder.setRepeat(0); //0 -> loop forever | ||
//1+ -> loop n times then stop | ||
encoder.setQuality(1); | ||
encoder.setSize(width, height); | ||
encoder.setDelay(delay); //go to next frame every n milliseconds | ||
|
||
if(frame_index == 0) | ||
{ | ||
|
||
encoder.start(); | ||
} | ||
else | ||
{ | ||
//alert(); | ||
encoder.cont(); | ||
encoder.setProperties(true, false); //started, firstFrame | ||
} | ||
|
||
encoder.addFrame(imageData, true); | ||
if(frame_length == frame_index) | ||
{ | ||
encoder.finish(); | ||
} | ||
self.postMessage({"frame_index":frame_index, "frame_data":encoder.stream().getData()}) //on the page, search for the GIF89a to see the frame_index | ||
}; |