diff --git a/s/anim.js b/s/anim.js deleted file mode 100644 index 691a671..0000000 --- a/s/anim.js +++ /dev/null @@ -1,26 +0,0 @@ -var $parent = document.createElement("div") - $gif = document.createElement("img") - ,$favicon = document.createElement("link") - -$gif.crossOrigin = "anonymous" - -$gif.src = "./s/favicon.gif" - -$favicon.rel = "icon" - -window.parent.document.head.appendChild($favicon) - -$parent.appendChild($gif) - -var supergif = new SuperGif({gif: $gif}) - ,$canvas - -supergif.load(()=> { - $canvas = supergif.get_canvas() - updateFavicon() -}) - -function updateFavicon() { - $favicon.href = $canvas.toDataURL() - window.requestAnimationFrame(updateFavicon) -} diff --git a/s/index.tpl.html b/s/index.tpl.html index b6db49b..4f4ac55 100644 --- a/s/index.tpl.html +++ b/s/index.tpl.html @@ -15,7 +15,5 @@ - - diff --git a/s/libgif.js b/s/libgif.js deleted file mode 100644 index b14e0e9..0000000 --- a/s/libgif.js +++ /dev/null @@ -1,990 +0,0 @@ -/* - 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) { - // 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; -})); - -