1 files changed, 106 insertions, 0 deletions
diff --git a/js/render.js b/js/render.js
new file mode 100644
index 0000000..fdb0125
--- /dev/null
+++ b/js/render.js
@@ -0,0 +1,106 @@
+var frame, img_frame;
+var timeout, raf_id, start_t = 0, old_t = 0, pause_t = 0
+var paused = false, dragging = false, rendering = false, scrolling = false, deferring = false, scrollTimeout = null;
+var fps = 30;
+
+function choose (){
+  imageURL = this.src
+  loading = true
+  $("#url").val(imageURL)
+  loadImage(imageURL, ready)
+}
+function load(){
+  loading = true
+  var imageURL = $("#url").val()
+  loadImage(imageURL, ready)
+}
+
+function ready(){
+  loading = false
+  if (window.gif) {
+    frame = gif.frames[0]
+    w = cc.canvas.width = frame.ctx.canvas.width
+    h = cc.canvas.height = frame.ctx.canvas.height
+    for (var i=0, f; f=gif.frames[i]; i++){
+      f.cloneData = f.ctx.getImageData(0,0,w,h)
+    }
+  }
+  else {
+    fc = cq(img.width, img.height)
+    fc.drawImage(img, 0, 0)
+    frame = img_frame = { ctx: fc.context }
+    w = cc.canvas.width = frame.ctx.canvas.width
+    h = cc.canvas.height = frame.ctx.canvas.height
+    frame.cloneData = frame.ctx.getImageData(0,0,w,h)
+  }
+}
+
+function giveFrame(t){
+  if (window.gif) {
+    if (gif.currentFrame) {
+      return gif.frames[gif.currentFrame(t)]
+    }
+    else {
+      return gif.frames[0]
+    }
+  }
+  else if (window.img) {
+    return img_frame
+  }
+  else {
+    return cq(w, h)
+  }
+}
+
+function reset(){
+  start_t = old_t
+  pause_t = 0
+  pause(false)
+  $("#rendered img").remove()
+  draw(0)
+}
+
+function pause(state){
+  $("#pause").toggleClass("paused", paused = typeof state == "boolean" ? state : ! paused).html(paused ? "paused" : "pause")
+}
+
+function step_forward(){
+  var step = $("#framedelay").float() * 1000 || 100
+  old_t += step
+  draw(old_t)
+  pause(true)
+}
+
+function animate(t){
+  raf_id = requestAnimationFrame(animate);
+
+  var step_t = t - old_t
+  old_t = t
+  
+  if (paused || dragging || rendering || scrolling || deferring) {
+    pause_t += step_t
+    if (scrolling) {
+      scrolling = false
+      deferring = true
+    }
+    else {
+      deferring = false
+    }
+    return
+  }
+
+  // var timing = +(new Date())
+  draw(t)
+  // timing = +(new Date()) - timing
+  fps = avg(fps, 1000/step_t, 4)
+  // status(~~(fps) + " fps")
+}
+
+function draw(t) {
+  t -= start_t
+  t -= pause_t
+  frame = giveFrame(t)
+  shade(frame, t)
+}
+
+function status(s){ $("#status").html(s); console.log(s) }