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(function(){
if ($("gif-recorder")) return;
var canvases = document.getElementsByTagName("canvas")
if (canvases.length == 0) { alert("no canvas found"); return; }
var biggest = 0, biggest_area = 0;
for (var i in canvases) {
var area = canvases[i].width*canvases[i].height
if (area > biggest_area) biggest = i;
}
var source = canvases[biggest]
var encoder = new GifEncoder()
encoder.on("encoded-frame", encoded_frame)
encoder.on("rendered", rendered_bytes)
encoder.on("rendered-url", rendered_url)
var w, h, x, y;
var w_el, h_el, x_el, y_el;
var last_t, frame_t, count, delay, offset, done;
var frames = []
var curtain, outline
var dragging = false
var lastGif
init()
function init(){
document.body.style.width = "100%"
document.body.style.height = "100%"
document.body.parentNode.style.width = "100%"
document.body.parentNode.style.height = "100%"
// var template = $("template").innerHTML
var el = document.createElement("div")
el.id = "gif-recorder"
// el.innerHTML = template
el.innerHTML = UI_TEMPLATE
document.body.appendChild(el)
bind()
activate()
}
function bind(){
curtain = $("curtain")
outline = $("outline")
controls = $("controls")
w_el = $("w_el")
h_el = $("h_el")
x_el = $("x_el")
y_el = $("y_el")
$("record").addEventListener("click", record, false)
$("save").addEventListener("click", save, false)
curtain.addEventListener("mousedown", box_start, false)
curtain.addEventListener("mousemove", box_size, false)
curtain.addEventListener("mouseup", box_end, false)
w_el.addEventListener("change", box_position, false)
h_el.addEventListener("change", box_position, false)
x_el.addEventListener("change", box_position, false)
y_el.addEventListener("change", box_position, false)
window.addEventListener("keydown", keydown, false)
}
var listening = false
function activate(){
listening = true
outline.style.display = "none"
controls.style.display = "block"
curtain.style.display = "block"
}
function deactivate(){
listening = false
console.log("not listening")
outline.style.display = "none"
controls.style.display = "none"
curtain.style.display = "none"
}
function keydown(e){
if (e.keyCode == 27) { // esc
listening ? deactivate() : activate()
}
}
function defer(callback){
var timeout = null
return function(){
clearTimeout(timeout)
timeout = setTimeout(callback, 300)
}
}
function box_start(e){
if (! listening) return
e.stopPropagation()
x = e.pageX
y = e.pageY
w = 1
h = 1
dragging = true
box_resize()
}
function box_position(){
w = _int(w_el)
h = _int(h_el)
x = _int(x_el)
y = _int(y_el)
box_resize()
}
function box_resize(){
if (isNaN(w) || isNaN(h) || isNaN(x) || isNaN(y)) return
w_el.value = ~~(w)
h_el.value = ~~(h)
x_el.value = ~~(x)
y_el.value = ~~(y)
outline.style.left = px(x-1)
outline.style.top = px(y-1)
outline.style.width = px(w)
outline.style.height = px(h)
outline.style.display = "block"
enable("record")
}
function box_size(e){
if (! dragging) return
e.stopPropagation()
w = e.pageX - x
h = e.pageY - y
box_resize()
}
function box_end(e){
e.preventDefault()
dragging = false
controls.style.display = "block"
$("record").focus()
}
function _int(el){ return parseInt(typeof el == "string" ? $(el).value : el.value) }
function _float(el){ return parseFloat(typeof el == "string" ? $(el).value : el.value) }
function show(id){ $(id).style.display="block" }
function hide(id){ $(id).style.display="none" }
function enable(id){ $(id).removeAttribute("disabled") }
function disable(id){ $(id).setAttribute("disabled","disabled") }
function clickable(id){ $(id).style.pointerEvents = "auto" }
function unclickable(id){ $(id).style.pointerEvents = "none" }
function px(n){ return (~~n) + "px" }
function record(e){
if (! listening) return
e.stopPropagation()
count = _int("framecount")
delay = _float("framedelay") * 1000
offset = source.getBoundingClientRect();
console.log(count, delay)
if (isNaN(count) || isNaN(delay)) return
done = 0
frame_t = 0
build()
capture()
last_t = +new Date()
requestAnimationFrame(recordloop)
status("recording")
disable("record")
unclickable("curtain")
unclickable("controls")
}
function recordloop(){
var canvas = document.createElement("canvas")
var t = +new Date()
frame_t += t - last_t
last_t = t
if (frame_t > delay) {
frame_t -= delay
capture()
}
if (done == count) {
render()
}
else {
requestAnimationFrame(recordloop)
}
}
function build(){
frames = new Array(count)
for (var i = 0; i < count; i++){
frames[i] = document.createElement("canvas")
frames[i].height = h
frames[i].width = w
}
}
function backgroundColor(){
var colors = [
source.style.backgroundColor,
document.body.style.backgroundColor,
"white"
]
for (var i in colors) {
if (colors[i] && colors[i] != "") return colors[i]
}
}
function capture(){
var frame = frames[done++]
var ctx = frame.getContext('2d')
ctx.fillStyle = backgroundColor()
ctx.fillRect(0,0,w,h)
ctx.drawImage(source, x-offset.left, y-offset.top, w, h, 0, 0, w, h)
}
function render(){
encoder.reset()
encoder.addFrames(frames, delay)
status("encoding")
try {
encoder.encode()
}
catch (e) {
rendering = false
status(e)
throw e
}
}
function $(s){ return document.getElementById("ge_" + s) }
function status(s){
$("status").innerHTML = s
}
function encoded_frame(done,count){
status("encoded " + done + " / " + count)
}
function rendered_bytes(bytes){
status(filesize(bytes.length))
}
function rendered_url(url){
var image = new Image ()
lastGif = image.src = url
$("preview").innerHTML = ""
$("preview").appendChild(image)
rendering = false
enable("record")
enable("save")
clickable("curtain")
clickable("controls")
}
function save (e){
e.stopPropagation()
if (! lastGif) return;
var filename = (window.location.host + window.location.pathname).replace(/[^a-zA-Z0-9]/g,"-").replace(/-+/,"-")
var blob = dataUriToBlob(lastGif)
saveAs(blob, filename + "-" + (+new Date()) + ".gif");
}
function filesize(n) {
if (n < 1e3) return n + " bytes"
if (n < 1e6) return decimalString(n/1e3) + " kb"
if (n < 1e9) return decimalString(n/1e6) + " mb"
return "WAY TOO BIG DUDE"
}
function decimalString(n){
var m = Math.floor(n);
return m + "." + Math.round((n-m)*10)
}
})()
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