2b:null 2c:["$","title",null,{"children":"@miketahani/lib | Mike Tahani | Observable"}] 31:T97a1,// this is a huge pain // original lib is at https://github.com/buzzfeed/libgif-js, but is unmaintained // unmerged PR #26 points to this file: https://github.com/jbaicoianu/libgif-js/blob/master/libgif.js // this is that unmerged file // load_url temporarily commented because of Observable quirks :( SuperGIF = { /* SuperGif Example usage:

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) { 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[pos >> 3] & (1 << (pos & 7))) { code |= 1 << i; } pos++; } return code; }; var clearCode = 1 << minCodeSize; var eoiCode = clearCode + 1; var codeSize = minCodeSize + 1; var outputBlockSize = 4096, bufferBlockSize = 4096; var output = new Uint8Array(outputBlockSize), buffer = new Uint8Array(bufferBlockSize), dict = []; var bufferOffset = 0, outputOffset = 0; var fill = function () { for (var i = 0; i < clearCode; i++) { dict[i] = new Uint8Array(1); dict[i][0] = i; } dict[clearCode] = new Uint8Array(0); dict[eoiCode] = null; } var clear = function () { var keep = clearCode + 2; dict.splice(keep, dict.length - keep); codeSize = minCodeSize + 1; bufferOffset = 0; }; // Block allocators, double block size each time var enlargeOutput = function() { var outputSize = output.length + outputBlockSize; var newoutput = new Uint8Array(outputSize); newoutput.set(output); output = newoutput; outputBlockSize = outputBlockSize << 1; } var enlargeBuffer = function() { var bufferSize = buffer.length + bufferBlockSize; var newbuffer = new Uint8Array(bufferSize); newbuffer.set(buffer); buffer = newbuffer; bufferBlockSize = bufferBlockSize << 1; } var pushCode = function(code, last) { var newlength = dict[last].byteLength + 1; while (bufferOffset + newlength > buffer.length) enlargeBuffer(); var newdict = buffer.subarray(bufferOffset, bufferOffset + newlength); newdict.set(dict[last]); newdict[newlength-1] = dict[code][0]; bufferOffset += newlength; dict.push(newdict); } var code; var last; fill(); while (true) { last = code; code = readCode(codeSize); if (code === clearCode) { clear(); continue; } if (code === eoiCode) break; if (code < dict.length) { if (last !== clearCode) { pushCode(code, last); } } else { if (code !== dict.length) throw new Error('Invalid LZW code.'); pushCode(last, last); } var newsize = dict[code].length; while (outputOffset + newsize > output.length) enlargeOutput(); output.set(dict[code], outputOffset); outputOffset += newsize; 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.subarray(0, outputOffset); }; // 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, offset = 0; var bufsize = 8192; data = new Uint8Array(bufsize); var resizeBuffer = function() { var newdata = new Uint8Array(data.length + bufsize); newdata.set(data); data = newdata; } do { size = st.readByte(); // Increase buffer size if this would exceed our current size while (offset + size > data.length) resizeBuffer(); data.set(st.readBytes(size), offset); offset += size; } while (size !== 0); return data.subarray(0, offset); // truncate any excess buffer space }; 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 for (var i = 0; i < img.pixels.length; i++) { var pixel = img.pixels[i]; // imgData.data === [R,G,B,A,R,G,B,A,...] if (pixel !== transparency) { var pix = ct[pixel]; var idx = i * 4; imgData.data[idx ] = pix[0]; imgData.data[idx + 1] = pix[1]; imgData.data[idx + 2] = pix[2]; imgData.data[idx + 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); if (parent) { 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() }, get_frame : function(i) { return frames[i]; }, // 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 instanceof ArrayBuffer) { // 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; // })); }32:[] 2f:{"id":"d600f693f795a31d","slug":"lib","title":"@miketahani/lib","thumbnail":"0cc2fb013dd4ed7548b760e9fac53b2730466763974d67d2bd71eeb4ad1b03e3","access_level":"public","create_time":"$D2018-04-06T00:17:00.290Z","update_time":"$D2018-04-06T08:56:27.560Z","view_time":null,"first_public_time":"$D2018-04-06T00:22:54.183Z","fork":false,"stars":0,"starred":false,"owner":{"type":"team","id":"f258f685ba4dff9a","login":"miketahani","name":"Mike Tahani","avatar_url":"https://avatars-next.observableusercontent.com/eaac9d07c89480b6348b8d4e15a8ada6cd440e3b8e1ba1b1a330f055aa368db8","tier":"starter_2024"},"version":32,"publish_version":32,"role":null,"authored":false,"authors":[{"type":"individual","id":"02c6b10033eb7a61","login":"miketahani","name":"Mike Tahani","avatar_url":"https://avatars-next.observableusercontent.com/8341f220c6016b9edcb3cf852d6526ce60b354ab1ec9cd907f76cfc54425f28e","tier":null}],"members":[{"type":"individual","id":"02c6b10033eb7a61","login":"miketahani","name":"Mike Tahani","avatar_url":"https://avatars-next.observableusercontent.com/8341f220c6016b9edcb3cf852d6526ce60b354ab1ec9cd907f76cfc54425f28e","tier":null,"role":"editor"}],"comments":[],"custom_thumbnail":false,"trashed":false,"subscribed":null,"forks":0,"collection":null,"type":"notebook","body":{"title":"@miketahani/lib","cells":[{"id":10,"value":"md`# @miketahani/lib`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":15,"value":"md`Libraries that have been modified to work in Observable, importable from other notebooks.\n\ne.g. \\`import { SuperGIF } from \"@miketahani/lib\"\\``","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":25,"value":"md`#### Necessary modifications\n- Turning XHRs into \\`fetch\\`es (Observable doesn't like XHR)\n- Changing the structure of the code so it can be used in a notebook (e.g. removing RequireJS boilerplate)\n- more\n`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":29,"value":"md`# Libraries`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":6,"value":"md`### SuperGif`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":2,"value":"$31","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"}],"files":"$W32","stdlib":"1","titling":"auto"}} 30:"$2f:body"