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tampermonkey script to make http://www.provinz.bz.it/wetter/niederschlagsvorhersage.asp more interactive
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// ==UserScript== | |
// @name improved interactivity for provinz.bz.it/wetter | |
// @namespace http://tampermonkey.net/ | |
// @version 0.1 | |
// @description makes http://www.provinz.bz.it/wetter/niederschlagsvorhersage.asp more interactive | |
// @author Martin Raifer <tyr.asd@gmail.com> | |
// @match http://www.provinz.bz.it/wetter/niederschlagsvorhersage.asp | |
// @grant none | |
// ==/UserScript== | |
/* | |
SuperGif | |
Example usage: | |
<img src="./example1_preview.gif" rel:animated_src="./example1.gif" width="360" height="360" rel:auto_play="1" /> | |
<script type="text/javascript"> | |
$$('img').each(function (img_tag) { | |
if (/.*\.gif/.test(img_tag.src)) { | |
var rub = new SuperGif({ gif: img_tag } ); | |
rub.load(); | |
} | |
}); | |
</script> | |
Image tag attributes: | |
rel:animated_src - If this url is specified, it's loaded into the player instead of src. | |
This allows a preview frame to be shown until animated gif data is streamed into the canvas | |
rel:auto_play - Defaults to 1 if not specified. If set to zero, a call to the play() method is needed | |
Constructor options args | |
gif Required. The DOM element of an img tag. | |
loop_mode Optional. Setting this to false will force disable looping of the gif. | |
auto_play Optional. Same as the rel:auto_play attribute above, this arg overrides the img tag info. | |
max_width Optional. Scale images over max_width down to max_width. Helpful with mobile. | |
on_end Optional. Add a callback for when the gif reaches the end of a single loop (one iteration). The first argument passed will be the gif HTMLElement. | |
loop_delay Optional. The amount of time to pause (in ms) after each single loop (iteration). | |
draw_while_loading Optional. Determines whether the gif will be drawn to the canvas whilst it is loaded. | |
show_progress_bar Optional. Only applies when draw_while_loading is set to true. | |
Instance methods | |
// loading | |
load( callback ) Loads the gif specified by the src or rel:animated_src sttributie of the img tag into a canvas element and then calls callback if one is passed | |
load_url( src, callback ) Loads the gif file specified in the src argument into a canvas element and then calls callback if one is passed | |
// play controls | |
play - Start playing the gif | |
pause - Stop playing the gif | |
move_to(i) - Move to frame i of the gif | |
move_relative(i) - Move i frames ahead (or behind if i < 0) | |
// getters | |
get_canvas The canvas element that the gif is playing in. Handy for assigning event handlers to. | |
get_playing Whether or not the gif is currently playing | |
get_loading Whether or not the gif has finished loading/parsing | |
get_auto_play Whether or not the gif is set to play automatically | |
get_length The number of frames in the gif | |
get_current_frame The index of the currently displayed frame of the gif | |
For additional customization (viewport inside iframe) these params may be passed: | |
c_w, c_h - width and height of canvas | |
vp_t, vp_l, vp_ w, vp_h - top, left, width and height of the viewport | |
A bonus: few articles to understand what is going on | |
http://enthusiasms.org/post/16976438906 | |
http://www.matthewflickinger.com/lab/whatsinagif/bits_and_bytes.asp | |
http://humpy77.deviantart.com/journal/Frame-Delay-Times-for-Animated-GIFs-214150546 | |
*/ | |
(function (root, factory) { | |
if (typeof define === 'function' && define.amd) { | |
define([], factory); | |
} else if (typeof exports === 'object') { | |
module.exports = factory(); | |
} else { | |
root.SuperGif = factory(); | |
} | |
}(this, function () { | |
// Generic functions | |
var bitsToNum = function (ba) { | |
return ba.reduce(function (s, n) { | |
return s * 2 + n; | |
}, 0); | |
}; | |
var byteToBitArr = function (bite) { | |
var a = []; | |
for (var i = 7; i >= 0; i--) { | |
a.push( !! (bite & (1 << i))); | |
} | |
return a; | |
}; | |
// Stream | |
/** | |
* @constructor | |
*/ | |
// Make compiler happy. | |
var Stream = function (data) { | |
this.data = data; | |
this.len = this.data.length; | |
this.pos = 0; | |
this.readByte = function () { | |
if (this.pos >= this.data.length) { | |
throw new Error('Attempted to read past end of stream.'); | |
} | |
if (data instanceof Uint8Array) | |
return data[this.pos++]; | |
else | |
return data.charCodeAt(this.pos++) & 0xFF; | |
}; | |
this.readBytes = function (n) { | |
var bytes = []; | |
for (var i = 0; i < n; i++) { | |
bytes.push(this.readByte()); | |
} | |
return bytes; | |
}; | |
this.read = function (n) { | |
var s = ''; | |
for (var i = 0; i < n; i++) { | |
s += String.fromCharCode(this.readByte()); | |
} | |
return s; | |
}; | |
this.readUnsigned = function () { // Little-endian. | |
var a = this.readBytes(2); | |
return (a[1] << 8) + a[0]; | |
}; | |
}; | |
var lzwDecode = function (minCodeSize, data) { | |
// TODO: Now that the GIF parser is a bit different, maybe this should get an array of bytes instead of a String? | |
var pos = 0; // Maybe this streaming thing should be merged with the Stream? | |
var readCode = function (size) { | |
var code = 0; | |
for (var i = 0; i < size; i++) { | |
if (data.charCodeAt(pos >> 3) & (1 << (pos & 7))) { | |
code |= 1 << i; | |
} | |
pos++; | |
} | |
return code; | |
}; | |
var output = []; | |
var clearCode = 1 << minCodeSize; | |
var eoiCode = clearCode + 1; | |
var codeSize = minCodeSize + 1; | |
var dict = []; | |
var clear = function () { | |
dict = []; | |
codeSize = minCodeSize + 1; | |
for (var i = 0; i < clearCode; i++) { | |
dict[i] = [i]; | |
} | |
dict[clearCode] = []; | |
dict[eoiCode] = null; | |
}; | |
var code; | |
var last; | |
while (true) { | |
last = code; | |
code = readCode(codeSize); | |
if (code === clearCode) { | |
clear(); | |
continue; | |
} | |
if (code === eoiCode) break; | |
if (code < dict.length) { | |
if (last !== clearCode) { | |
dict.push(dict[last].concat(dict[code][0])); | |
} | |
} | |
else { | |
if (code !== dict.length) throw new Error('Invalid LZW code.'); | |
dict.push(dict[last].concat(dict[last][0])); | |
} | |
output.push.apply(output, dict[code]); | |
if (dict.length === (1 << codeSize) && codeSize < 12) { | |
// If we're at the last code and codeSize is 12, the next code will be a clearCode, and it'll be 12 bits long. | |
codeSize++; | |
} | |
} | |
// I don't know if this is technically an error, but some GIFs do it. | |
//if (Math.ceil(pos / 8) !== data.length) throw new Error('Extraneous LZW bytes.'); | |
return output; | |
}; | |
// The actual parsing; returns an object with properties. | |
var parseGIF = function (st, handler) { | |
handler || (handler = {}); | |
// LZW (GIF-specific) | |
var parseCT = function (entries) { // Each entry is 3 bytes, for RGB. | |
var ct = []; | |
for (var i = 0; i < entries; i++) { | |
ct.push(st.readBytes(3)); | |
} | |
return ct; | |
}; | |
var readSubBlocks = function () { | |
var size, data; | |
data = ''; | |
do { | |
size = st.readByte(); | |
data += st.read(size); | |
} while (size !== 0); | |
return data; | |
}; | |
var parseHeader = function () { | |
var hdr = {}; | |
hdr.sig = st.read(3); | |
hdr.ver = st.read(3); | |
if (hdr.sig !== 'GIF') throw new Error('Not a GIF file.'); // XXX: This should probably be handled more nicely. | |
hdr.width = st.readUnsigned(); | |
hdr.height = st.readUnsigned(); | |
var bits = byteToBitArr(st.readByte()); | |
hdr.gctFlag = bits.shift(); | |
hdr.colorRes = bitsToNum(bits.splice(0, 3)); | |
hdr.sorted = bits.shift(); | |
hdr.gctSize = bitsToNum(bits.splice(0, 3)); | |
hdr.bgColor = st.readByte(); | |
hdr.pixelAspectRatio = st.readByte(); // if not 0, aspectRatio = (pixelAspectRatio + 15) / 64 | |
if (hdr.gctFlag) { | |
hdr.gct = parseCT(1 << (hdr.gctSize + 1)); | |
} | |
handler.hdr && handler.hdr(hdr); | |
}; | |
var parseExt = function (block) { | |
var parseGCExt = function (block) { | |
var blockSize = st.readByte(); // Always 4 | |
var bits = byteToBitArr(st.readByte()); | |
block.reserved = bits.splice(0, 3); // Reserved; should be 000. | |
block.disposalMethod = bitsToNum(bits.splice(0, 3)); | |
block.userInput = bits.shift(); | |
block.transparencyGiven = bits.shift(); | |
block.delayTime = st.readUnsigned(); | |
block.transparencyIndex = st.readByte(); | |
block.terminator = st.readByte(); | |
handler.gce && handler.gce(block); | |
}; | |
var parseComExt = function (block) { | |
block.comment = readSubBlocks(); | |
handler.com && handler.com(block); | |
}; | |
var parsePTExt = function (block) { | |
// No one *ever* uses this. If you use it, deal with parsing it yourself. | |
var blockSize = st.readByte(); // Always 12 | |
block.ptHeader = st.readBytes(12); | |
block.ptData = readSubBlocks(); | |
handler.pte && handler.pte(block); | |
}; | |
var parseAppExt = function (block) { | |
var parseNetscapeExt = function (block) { | |
var blockSize = st.readByte(); // Always 3 | |
block.unknown = st.readByte(); // ??? Always 1? What is this? | |
block.iterations = st.readUnsigned(); | |
block.terminator = st.readByte(); | |
handler.app && handler.app.NETSCAPE && handler.app.NETSCAPE(block); | |
}; | |
var parseUnknownAppExt = function (block) { | |
block.appData = readSubBlocks(); | |
// FIXME: This won't work if a handler wants to match on any identifier. | |
handler.app && handler.app[block.identifier] && handler.app[block.identifier](block); | |
}; | |
var blockSize = st.readByte(); // Always 11 | |
block.identifier = st.read(8); | |
block.authCode = st.read(3); | |
switch (block.identifier) { | |
case 'NETSCAPE': | |
parseNetscapeExt(block); | |
break; | |
default: | |
parseUnknownAppExt(block); | |
break; | |
} | |
}; | |
var parseUnknownExt = function (block) { | |
block.data = readSubBlocks(); | |
handler.unknown && handler.unknown(block); | |
}; | |
block.label = st.readByte(); | |
switch (block.label) { | |
case 0xF9: | |
block.extType = 'gce'; | |
parseGCExt(block); | |
break; | |
case 0xFE: | |
block.extType = 'com'; | |
parseComExt(block); | |
break; | |
case 0x01: | |
block.extType = 'pte'; | |
parsePTExt(block); | |
break; | |
case 0xFF: | |
block.extType = 'app'; | |
parseAppExt(block); | |
break; | |
default: | |
block.extType = 'unknown'; | |
parseUnknownExt(block); | |
break; | |
} | |
}; | |
var parseImg = function (img) { | |
var deinterlace = function (pixels, width) { | |
// Of course this defeats the purpose of interlacing. And it's *probably* | |
// the least efficient way it's ever been implemented. But nevertheless... | |
var newPixels = new Array(pixels.length); | |
var rows = pixels.length / width; | |
var cpRow = function (toRow, fromRow) { | |
var fromPixels = pixels.slice(fromRow * width, (fromRow + 1) * width); | |
newPixels.splice.apply(newPixels, [toRow * width, width].concat(fromPixels)); | |
}; | |
// See appendix E. | |
var offsets = [0, 4, 2, 1]; | |
var steps = [8, 8, 4, 2]; | |
var fromRow = 0; | |
for (var pass = 0; pass < 4; pass++) { | |
for (var toRow = offsets[pass]; toRow < rows; toRow += steps[pass]) { | |
cpRow(toRow, fromRow) | |
fromRow++; | |
} | |
} | |
return newPixels; | |
}; | |
img.leftPos = st.readUnsigned(); | |
img.topPos = st.readUnsigned(); | |
img.width = st.readUnsigned(); | |
img.height = st.readUnsigned(); | |
var bits = byteToBitArr(st.readByte()); | |
img.lctFlag = bits.shift(); | |
img.interlaced = bits.shift(); | |
img.sorted = bits.shift(); | |
img.reserved = bits.splice(0, 2); | |
img.lctSize = bitsToNum(bits.splice(0, 3)); | |
if (img.lctFlag) { | |
img.lct = parseCT(1 << (img.lctSize + 1)); | |
} | |
img.lzwMinCodeSize = st.readByte(); | |
var lzwData = readSubBlocks(); | |
img.pixels = lzwDecode(img.lzwMinCodeSize, lzwData); | |
if (img.interlaced) { // Move | |
img.pixels = deinterlace(img.pixels, img.width); | |
} | |
handler.img && handler.img(img); | |
}; | |
var parseBlock = function () { | |
var block = {}; | |
block.sentinel = st.readByte(); | |
switch (String.fromCharCode(block.sentinel)) { // For ease of matching | |
case '!': | |
block.type = 'ext'; | |
parseExt(block); | |
break; | |
case ',': | |
block.type = 'img'; | |
parseImg(block); | |
break; | |
case ';': | |
block.type = 'eof'; | |
handler.eof && handler.eof(block); | |
break; | |
default: | |
throw new Error('Unknown block: 0x' + block.sentinel.toString(16)); // TODO: Pad this with a 0. | |
} | |
if (block.type !== 'eof') setTimeout(parseBlock, 0); | |
}; | |
var parse = function () { | |
parseHeader(); | |
setTimeout(parseBlock, 0); | |
}; | |
parse(); | |
}; | |
var SuperGif = function ( opts ) { | |
var options = { | |
//viewport position | |
vp_l: 0, | |
vp_t: 0, | |
vp_w: null, | |
vp_h: null, | |
//canvas sizes | |
c_w: null, | |
c_h: null | |
}; | |
for (var i in opts ) { options[i] = opts[i] } | |
if (options.vp_w && options.vp_h) options.is_vp = true; | |
var stream; | |
var hdr; | |
var loadError = null; | |
var loading = false; | |
var transparency = null; | |
var delay = null; | |
var disposalMethod = null; | |
var disposalRestoreFromIdx = null; | |
var lastDisposalMethod = null; | |
var frame = null; | |
var lastImg = null; | |
var playing = true; | |
var forward = true; | |
var ctx_scaled = false; | |
var frames = []; | |
var frameOffsets = []; // elements have .x and .y properties | |
var gif = options.gif; | |
if (typeof options.auto_play == 'undefined') | |
options.auto_play = (!gif.getAttribute('rel:auto_play') || gif.getAttribute('rel:auto_play') == '1'); | |
var onEndListener = (options.hasOwnProperty('on_end') ? options.on_end : null); | |
var loopDelay = (options.hasOwnProperty('loop_delay') ? options.loop_delay : 0); | |
var overrideLoopMode = (options.hasOwnProperty('loop_mode') ? options.loop_mode : 'auto'); | |
var drawWhileLoading = (options.hasOwnProperty('draw_while_loading') ? options.draw_while_loading : true); | |
var showProgressBar = drawWhileLoading ? (options.hasOwnProperty('show_progress_bar') ? options.show_progress_bar : true) : false; | |
var progressBarHeight = (options.hasOwnProperty('progressbar_height') ? options.progressbar_height : 25); | |
var progressBarBackgroundColor = (options.hasOwnProperty('progressbar_background_color') ? options.progressbar_background_color : 'rgba(255,255,255,0.4)'); | |
var progressBarForegroundColor = (options.hasOwnProperty('progressbar_foreground_color') ? options.progressbar_foreground_color : 'rgba(255,0,22,.8)'); | |
var clear = function () { | |
transparency = null; | |
delay = null; | |
lastDisposalMethod = disposalMethod; | |
disposalMethod = null; | |
frame = null; | |
}; | |
// XXX: There's probably a better way to handle catching exceptions when | |
// callbacks are involved. | |
var doParse = function () { | |
try { | |
parseGIF(stream, handler); | |
} | |
catch (err) { | |
doLoadError('parse'); | |
} | |
}; | |
var doText = function (text) { | |
toolbar.innerHTML = text; // innerText? Escaping? Whatever. | |
toolbar.style.visibility = 'visible'; | |
}; | |
var setSizes = function(w, h) { | |
canvas.width = w * get_canvas_scale(); | |
canvas.height = h * get_canvas_scale(); | |
toolbar.style.minWidth = ( w * get_canvas_scale() ) + 'px'; | |
tmpCanvas.width = w; | |
tmpCanvas.height = h; | |
tmpCanvas.style.width = w + 'px'; | |
tmpCanvas.style.height = h + 'px'; | |
tmpCanvas.getContext('2d').setTransform(1, 0, 0, 1, 0, 0); | |
}; | |
var setFrameOffset = function(frame, offset) { | |
if (!frameOffsets[frame]) { | |
frameOffsets[frame] = offset; | |
return; | |
} | |
if (typeof offset.x !== 'undefined') { | |
frameOffsets[frame].x = offset.x; | |
} | |
if (typeof offset.y !== 'undefined') { | |
frameOffsets[frame].y = offset.y; | |
} | |
}; | |
var doShowProgress = function (pos, length, draw) { | |
if (draw && showProgressBar) { | |
var height = progressBarHeight; | |
var left, mid, top, width; | |
if (options.is_vp) { | |
if (!ctx_scaled) { | |
top = (options.vp_t + options.vp_h - height); | |
height = height; | |
left = options.vp_l; | |
mid = left + (pos / length) * options.vp_w; | |
width = canvas.width; | |
} else { | |
top = (options.vp_t + options.vp_h - height) / get_canvas_scale(); | |
height = height / get_canvas_scale(); | |
left = (options.vp_l / get_canvas_scale() ); | |
mid = left + (pos / length) * (options.vp_w / get_canvas_scale()); | |
width = canvas.width / get_canvas_scale(); | |
} | |
//some debugging, draw rect around viewport | |
if (false) { | |
if (!ctx_scaled) { | |
var l = options.vp_l, t = options.vp_t; | |
var w = options.vp_w, h = options.vp_h; | |
} else { | |
var l = options.vp_l/get_canvas_scale(), t = options.vp_t/get_canvas_scale(); | |
var w = options.vp_w/get_canvas_scale(), h = options.vp_h/get_canvas_scale(); | |
} | |
ctx.rect(l,t,w,h); | |
ctx.stroke(); | |
} | |
} | |
else { | |
top = (canvas.height - height) / (ctx_scaled ? get_canvas_scale() : 1); | |
mid = ((pos / length) * canvas.width) / (ctx_scaled ? get_canvas_scale() : 1); | |
width = canvas.width / (ctx_scaled ? get_canvas_scale() : 1 ); | |
height /= ctx_scaled ? get_canvas_scale() : 1; | |
} | |
ctx.fillStyle = progressBarBackgroundColor; | |
ctx.fillRect(mid, top, width - mid, height); | |
ctx.fillStyle = progressBarForegroundColor; | |
ctx.fillRect(0, top, mid, height); | |
} | |
}; | |
var doLoadError = function (originOfError) { | |
var drawError = function () { | |
ctx.fillStyle = 'black'; | |
ctx.fillRect(0, 0, options.c_w ? options.c_w : hdr.width, options.c_h ? options.c_h : hdr.height); | |
ctx.strokeStyle = 'red'; | |
ctx.lineWidth = 3; | |
ctx.moveTo(0, 0); | |
ctx.lineTo(options.c_w ? options.c_w : hdr.width, options.c_h ? options.c_h : hdr.height); | |
ctx.moveTo(0, options.c_h ? options.c_h : hdr.height); | |
ctx.lineTo(options.c_w ? options.c_w : hdr.width, 0); | |
ctx.stroke(); | |
}; | |
loadError = originOfError; | |
hdr = { | |
width: gif.width, | |
height: gif.height | |
}; // Fake header. | |
frames = []; | |
drawError(); | |
}; | |
var doHdr = function (_hdr) { | |
hdr = _hdr; | |
setSizes(hdr.width, hdr.height) | |
}; | |
var doGCE = function (gce) { | |
pushFrame(); | |
clear(); | |
transparency = gce.transparencyGiven ? gce.transparencyIndex : null; | |
delay = gce.delayTime; | |
disposalMethod = gce.disposalMethod; | |
// We don't have much to do with the rest of GCE. | |
}; | |
var pushFrame = function () { | |
if (!frame) return; | |
frames.push({ | |
data: frame.getImageData(0, 0, hdr.width, hdr.height), | |
delay: delay | |
}); | |
frameOffsets.push({ x: 0, y: 0 }); | |
}; | |
var doImg = function (img) { | |
if (!frame) frame = tmpCanvas.getContext('2d'); | |
var currIdx = frames.length; | |
//ct = color table, gct = global color table | |
var ct = img.lctFlag ? img.lct : hdr.gct; // TODO: What if neither exists? | |
/* | |
Disposal method indicates the way in which the graphic is to | |
be treated after being displayed. | |
Values : 0 - No disposal specified. The decoder is | |
not required to take any action. | |
1 - Do not dispose. The graphic is to be left | |
in place. | |
2 - Restore to background color. The area used by the | |
graphic must be restored to the background color. | |
3 - Restore to previous. The decoder is required to | |
restore the area overwritten by the graphic with | |
what was there prior to rendering the graphic. | |
Importantly, "previous" means the frame state | |
after the last disposal of method 0, 1, or 2. | |
*/ | |
if (currIdx > 0) { | |
if (lastDisposalMethod === 3) { | |
// Restore to previous | |
// If we disposed every frame including first frame up to this point, then we have | |
// no composited frame to restore to. In this case, restore to background instead. | |
if (disposalRestoreFromIdx !== null) { | |
frame.putImageData(frames[disposalRestoreFromIdx].data, 0, 0); | |
} else { | |
frame.clearRect(lastImg.leftPos, lastImg.topPos, lastImg.width, lastImg.height); | |
} | |
} else { | |
disposalRestoreFromIdx = currIdx - 1; | |
} | |
if (lastDisposalMethod === 2) { | |
// Restore to background color | |
// Browser implementations historically restore to transparent; we do the same. | |
// http://www.wizards-toolkit.org/discourse-server/viewtopic.php?f=1&t=21172#p86079 | |
frame.clearRect(lastImg.leftPos, lastImg.topPos, lastImg.width, lastImg.height); | |
} | |
} | |
// else, Undefined/Do not dispose. | |
// frame contains final pixel data from the last frame; do nothing | |
//Get existing pixels for img region after applying disposal method | |
var imgData = frame.getImageData(img.leftPos, img.topPos, img.width, img.height); | |
//apply color table colors | |
img.pixels.forEach(function (pixel, i) { | |
// imgData.data === [R,G,B,A,R,G,B,A,...] | |
if (pixel !== transparency) { | |
imgData.data[i * 4 + 0] = ct[pixel][0]; | |
imgData.data[i * 4 + 1] = ct[pixel][1]; | |
imgData.data[i * 4 + 2] = ct[pixel][2]; | |
imgData.data[i * 4 + 3] = 255; // Opaque. | |
} | |
}); | |
frame.putImageData(imgData, img.leftPos, img.topPos); | |
if (!ctx_scaled) { | |
ctx.scale(get_canvas_scale(),get_canvas_scale()); | |
ctx_scaled = true; | |
} | |
// We could use the on-page canvas directly, except that we draw a progress | |
// bar for each image chunk (not just the final image). | |
if (drawWhileLoading) { | |
ctx.drawImage(tmpCanvas, 0, 0); | |
drawWhileLoading = options.auto_play; | |
} | |
lastImg = img; | |
}; | |
var player = (function () { | |
var i = -1; | |
var iterationCount = 0; | |
var showingInfo = false; | |
var pinned = false; | |
/** | |
* Gets the index of the frame "up next". | |
* @returns {number} | |
*/ | |
var getNextFrameNo = function () { | |
var delta = (forward ? 1 : -1); | |
return (i + delta + frames.length) % frames.length; | |
}; | |
var stepFrame = function (amount) { // XXX: Name is confusing. | |
i = i + amount; | |
putFrame(); | |
}; | |
var step = (function () { | |
var stepping = false; | |
var completeLoop = function () { | |
if (onEndListener !== null) | |
onEndListener(gif); | |
iterationCount++; | |
if (overrideLoopMode !== false || iterationCount < 0) { | |
doStep(); | |
} else { | |
stepping = false; | |
playing = false; | |
} | |
}; | |
var doStep = function () { | |
stepping = playing; | |
if (!stepping) return; | |
stepFrame(1); | |
var delay = frames[i].delay * 10; | |
if (!delay) delay = 100; // FIXME: Should this even default at all? What should it be? | |
var nextFrameNo = getNextFrameNo(); | |
if (nextFrameNo === 0) { | |
delay += loopDelay; | |
setTimeout(completeLoop, delay); | |
} else { | |
setTimeout(doStep, delay); | |
} | |
}; | |
return function () { | |
if (!stepping) setTimeout(doStep, 0); | |
}; | |
}()); | |
var putFrame = function () { | |
var offset; | |
i = parseInt(i, 10); | |
if (i > frames.length - 1){ | |
i = 0; | |
} | |
if (i < 0){ | |
i = 0; | |
} | |
offset = frameOffsets[i]; | |
tmpCanvas.getContext("2d").putImageData(frames[i].data, offset.x, offset.y); | |
ctx.globalCompositeOperation = "copy"; | |
ctx.drawImage(tmpCanvas, 0, 0); | |
}; | |
var play = function () { | |
playing = true; | |
step(); | |
}; | |
var pause = function () { | |
playing = false; | |
}; | |
return { | |
init: function () { | |
if (loadError) return; | |
if ( ! (options.c_w && options.c_h) ) { | |
ctx.scale(get_canvas_scale(),get_canvas_scale()); | |
} | |
if (options.auto_play) { | |
step(); | |
} | |
else { | |
i = 0; | |
putFrame(); | |
} | |
}, | |
step: step, | |
play: play, | |
pause: pause, | |
playing: playing, | |
move_relative: stepFrame, | |
current_frame: function() { return i; }, | |
length: function() { return frames.length }, | |
move_to: function ( frame_idx ) { | |
i = frame_idx; | |
putFrame(); | |
} | |
} | |
}()); | |
var doDecodeProgress = function (draw) { | |
doShowProgress(stream.pos, stream.data.length, draw); | |
}; | |
var doNothing = function () {}; | |
/** | |
* @param{boolean=} draw Whether to draw progress bar or not; this is not idempotent because of translucency. | |
* Note that this means that the text will be unsynchronized with the progress bar on non-frames; | |
* but those are typically so small (GCE etc.) that it doesn't really matter. TODO: Do this properly. | |
*/ | |
var withProgress = function (fn, draw) { | |
return function (block) { | |
fn(block); | |
doDecodeProgress(draw); | |
}; | |
}; | |
var handler = { | |
hdr: withProgress(doHdr), | |
gce: withProgress(doGCE), | |
com: withProgress(doNothing), | |
// I guess that's all for now. | |
app: { | |
// TODO: Is there much point in actually supporting iterations? | |
NETSCAPE: withProgress(doNothing) | |
}, | |
img: withProgress(doImg, true), | |
eof: function (block) { | |
//toolbar.style.display = ''; | |
pushFrame(); | |
doDecodeProgress(false); | |
if ( ! (options.c_w && options.c_h) ) { | |
canvas.width = hdr.width * get_canvas_scale(); | |
canvas.height = hdr.height * get_canvas_scale(); | |
} | |
player.init(); | |
loading = false; | |
if (load_callback) { | |
load_callback(gif); | |
} | |
} | |
}; | |
var init = function () { | |
var parent = gif.parentNode; | |
var div = document.createElement('div'); | |
canvas = document.createElement('canvas'); | |
ctx = canvas.getContext('2d'); | |
toolbar = document.createElement('div'); | |
tmpCanvas = document.createElement('canvas'); | |
div.width = canvas.width = gif.width; | |
div.height = canvas.height = gif.height; | |
toolbar.style.minWidth = gif.width + 'px'; | |
div.className = 'jsgif'; | |
toolbar.className = 'jsgif_toolbar'; | |
div.appendChild(canvas); | |
div.appendChild(toolbar); | |
parent.insertBefore(div, gif); | |
parent.removeChild(gif); | |
if (options.c_w && options.c_h) setSizes(options.c_w, options.c_h); | |
initialized=true; | |
}; | |
var get_canvas_scale = function() { | |
var scale; | |
if (options.max_width && hdr && hdr.width > options.max_width) { | |
scale = options.max_width / hdr.width; | |
} | |
else { | |
scale = 1; | |
} | |
return scale; | |
} | |
var canvas, ctx, toolbar, tmpCanvas; | |
var initialized = false; | |
var load_callback = false; | |
var load_setup = function(callback) { | |
if (loading) return false; | |
if (callback) load_callback = callback; | |
else load_callback = false; | |
loading = true; | |
frames = []; | |
clear(); | |
disposalRestoreFromIdx = null; | |
lastDisposalMethod = null; | |
frame = null; | |
lastImg = null; | |
return true; | |
} | |
return { | |
// play controls | |
play: player.play, | |
pause: player.pause, | |
move_relative: player.move_relative, | |
move_to: player.move_to, | |
// getters for instance vars | |
get_playing : function() { return playing }, | |
get_canvas : function() { return canvas }, | |
get_canvas_scale : function() { return get_canvas_scale() }, | |
get_loading : function() { return loading }, | |
get_auto_play : function() { return options.auto_play }, | |
get_length : function() { return player.length() }, | |
get_current_frame: function() { return player.current_frame() }, | |
load_url: function(src,callback){ | |
if (!load_setup(callback)) return; | |
var h = new XMLHttpRequest(); | |
// new browsers (XMLHttpRequest2-compliant) | |
h.open('GET', src, true); | |
if ('overrideMimeType' in h) { | |
h.overrideMimeType('text/plain; charset=x-user-defined'); | |
} | |
// old browsers (XMLHttpRequest-compliant) | |
else if ('responseType' in h) { | |
h.responseType = 'arraybuffer'; | |
} | |
// IE9 (Microsoft.XMLHTTP-compliant) | |
else { | |
h.setRequestHeader('Accept-Charset', 'x-user-defined'); | |
} | |
h.onloadstart = function() { | |
// Wait until connection is opened to replace the gif element with a canvas to avoid a blank img | |
if (!initialized) init(); | |
}; | |
h.onload = function(e) { | |
if (this.status != 200) { | |
doLoadError('xhr - response'); | |
} | |
// emulating response field for IE9 | |
if (!('response' in this)) { | |
this.response = new VBArray(this.responseText).toArray().map(String.fromCharCode).join(''); | |
} | |
var data = this.response; | |
if (data.toString().indexOf("ArrayBuffer") > 0) { | |
data = new Uint8Array(data); | |
} | |
stream = new Stream(data); | |
setTimeout(doParse, 0); | |
}; | |
h.onprogress = function (e) { | |
if (e.lengthComputable) doShowProgress(e.loaded, e.total, true); | |
}; | |
h.onerror = function() { doLoadError('xhr'); }; | |
h.send(); | |
}, | |
load: function (callback) { | |
this.load_url(gif.getAttribute('rel:animated_src') || gif.src,callback); | |
}, | |
load_raw: function(arr, callback) { | |
if (!load_setup(callback)) return; | |
if (!initialized) init(); | |
stream = new Stream(arr); | |
setTimeout(doParse, 0); | |
}, | |
set_frame_offset: setFrameOffset | |
}; | |
}; | |
return SuperGif; | |
})); | |
/* | |
RubbableGif | |
Example usage: | |
<img src="./example1_preview.gif" rel:animated_src="./example1.gif" width="360" height="360" rel:auto_play="1" /> | |
<script type="text/javascript"> | |
$$('img').each(function (img_tag) { | |
if (/.*\.gif/.test(img_tag.src)) { | |
var rub = new RubbableGif({ gif: img_tag } ); | |
rub.load(); | |
} | |
}); | |
</script> | |
Image tag attributes: | |
rel:animated_src - If this url is specified, it's loaded into the player instead of src. | |
This allows a preview frame to be shown until animated gif data is streamed into the canvas | |
rel:auto_play - Defaults to 1 if not specified. If set to zero, the gif will be rubbable but will not | |
animate unless the user is rubbing it. | |
Constructor options args | |
gif Required. The DOM element of an img tag. | |
auto_play Optional. Same as the rel:auto_play attribute above, this arg overrides the img tag info. | |
max_width Optional. Scale images over max_width down to max_width. Helpful with mobile. | |
Instance methods | |
// loading | |
load( callback ) Loads the gif into a canvas element and then calls callback if one is passed | |
// play controls | |
play - Start playing the gif | |
pause - Stop playing the gif | |
move_to(i) - Move to frame i of the gif | |
move_relative(i) - Move i frames ahead (or behind if i < 0) | |
// getters | |
get_canvas The canvas element that the gif is playing in. | |
get_playing Whether or not the gif is currently playing | |
get_loading Whether or not the gif has finished loading/parsing | |
get_auto_play Whether or not the gif is set to play automatically | |
get_length The number of frames in the gif | |
get_current_frame The index of the currently displayed frame of the gif | |
For additional customization (viewport inside iframe) these params may be passed: | |
c_w, c_h - width and height of canvas | |
vp_t, vp_l, vp_ w, vp_h - top, left, width and height of the viewport | |
*/ | |
(function (root, factory) { | |
if (typeof define === 'function' && define.amd) { | |
define(['./libgif'], factory); | |
} else if (typeof exports === 'object') { | |
module.exports = factory(require('./libgif')); | |
} else { | |
root.RubbableGif = factory(root.SuperGif); | |
} | |
}(this, function (SuperGif) { | |
var RubbableGif = function( options ) { | |
var sup = new SuperGif( options ); | |
var register_canvas_handers = function () { | |
var isvp = function(x) { | |
return (options.vp_l ? ( x - options.vp_l ) : x ); | |
} | |
var canvas = sup.get_canvas(); | |
var maxTime = 1000, | |
// allow movement if < 1000 ms (1 sec) | |
w = ( options.vp_w ? options.vp_w : canvas.width ), | |
maxDistance = Math.floor(w / (sup.get_length() * 2)), | |
// swipe movement of 50 pixels triggers the swipe | |
startX = 0, | |
startTime = 0; | |
var cantouch = "ontouchend" in document; | |
var aj = 0; | |
var last_played = 0; | |
canvas.addEventListener((cantouch) ? 'touchstart' : 'mousedown', function (e) { | |
// prevent image drag (Firefox) | |
e.preventDefault(); | |
if (sup.get_auto_play()) sup.pause(); | |
var pos = (e.touches && e.touches.length > 0) ? e.touches[0] : e; | |
var x = (pos.layerX > 0) ? isvp(pos.layerX) : w / 2; | |
var progress = x / w; | |
sup.move_to( Math.floor(progress * (sup.get_length() - 1)) ); | |
startTime = e.timeStamp; | |
startX = isvp(pos.pageX); | |
}); | |
canvas.addEventListener((cantouch) ? 'touchend' : 'mouseup', function (e) { | |
startTime = 0; | |
startX = 0; | |
if (sup.get_auto_play()) sup.play(); | |
}); | |
canvas.addEventListener((cantouch) ? 'touchmove' : 'mousemove', function (e) { | |
e.preventDefault(); | |
var pos = (e.touches && e.touches.length > 0) ? e.touches[0] : e; | |
var currentX = isvp(pos.pageX); | |
currentDistance = (startX === 0) ? 0 : Math.abs(currentX - startX); | |
// allow if movement < 1 sec | |
currentTime = e.timeStamp; | |
if (startTime !== 0 && currentDistance > maxDistance) { | |
if (currentX < startX && sup.get_current_frame() > 0) { | |
sup.move_relative(-1); | |
} | |
if (currentX > startX && sup.get_current_frame() < sup.get_length() - 1) { | |
sup.move_relative(1); | |
} | |
startTime = e.timeStamp; | |
startX = isvp(pos.pageX); | |
} | |
var time_since_last_play = e.timeStamp - last_played; | |
{ | |
aj++; | |
if (document.getElementById('tickles' + ((aj % 5) + 1))) document.getElementById('tickles' + ((aj % 5) + 1)).play(); | |
last_played = e.timeStamp; | |
} | |
}); | |
}; | |
sup.orig_load = sup.load; | |
sup.load = function(callback) { | |
sup.orig_load( function() { | |
if (callback) callback(); | |
register_canvas_handers( sup ); | |
} ); | |
} | |
return sup; | |
} | |
return RubbableGif; | |
})); | |
(function() { | |
'use strict'; | |
$(function() { | |
$('img').each(function (i, img_tag) { | |
if (/.*\.gif/.test(img_tag.src)) { | |
console.log("replacing gif", img_tag.src); | |
var rub = new RubbableGif({ gif: img_tag, rubbable: true } ); | |
rub.load(function(){ | |
console.log('oh hey, now the gif is loaded'); | |
}); | |
} | |
}); | |
}); | |
})(); |
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