1170 lines
38 KiB
JavaScript
1170 lines
38 KiB
JavaScript
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/*
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SuperGif
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Example usage:
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<img src="./example1_preview.gif" rel:animated_src="./example1.gif" width="360" height="360" rel:auto_play="1" />
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<script type="text/javascript">
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$$('img').each(function (img_tag) {
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if (/.*\.gif/.test(img_tag.src)) {
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var rub = new SuperGif({ gif: img_tag } );
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rub.load();
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}
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});
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</script>
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Image tag attributes:
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rel:animated_src - If this url is specified, it's loaded into the player instead of src.
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This allows a preview frame to be shown until animated gif data is streamed into the canvas
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rel:auto_play - Defaults to 1 if not specified. If set to zero, a call to the play() method is needed
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Constructor options args
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gif Required. The DOM element of an img tag.
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loop_mode Optional. Setting this to false will force disable looping of the gif.
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auto_play Optional. Same as the rel:auto_play attribute above, this arg overrides the img tag info.
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max_width Optional. Scale images over max_width down to max_width. Helpful with mobile.
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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.
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loop_delay Optional. The amount of time to pause (in ms) after each single loop (iteration).
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draw_while_loading Optional. Determines whether the gif will be drawn to the canvas whilst it is loaded.
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show_progress_bar Optional. Only applies when draw_while_loading is set to true.
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Instance methods
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// loading
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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
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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
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// play controls
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play - Start playing the gif
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pause - Stop playing the gif
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move_to(i) - Move to frame i of the gif
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move_relative(i) - Move i frames ahead (or behind if i < 0)
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// getters
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get_canvas The canvas element that the gif is playing in. Handy for assigning event handlers to.
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get_playing Whether or not the gif is currently playing
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get_loading Whether or not the gif has finished loading/parsing
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get_auto_play Whether or not the gif is set to play automatically
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get_length The number of frames in the gif
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get_current_frame The index of the currently displayed frame of the gif
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For additional customization (viewport inside iframe) these params may be passed:
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c_w, c_h - width and height of canvas
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vp_t, vp_l, vp_ w, vp_h - top, left, width and height of the viewport
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A bonus: few articles to understand what is going on
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http://enthusiasms.org/post/16976438906
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http://www.matthewflickinger.com/lab/whatsinagif/bits_and_bytes.asp
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http://humpy77.deviantart.com/journal/Frame-Delay-Times-for-Animated-GIFs-214150546
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*/
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(function (root, factory)
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{
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if (typeof define === 'function' && define.amd)
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{
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define([], factory);
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} else if (typeof exports === 'object')
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{
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module.exports = factory();
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} else
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{
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root.SuperGif = factory();
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}
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}(this, function ()
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{
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// Generic functions
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var bitsToNum = function (ba)
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{
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return ba.reduce(function (s, n)
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{
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return s * 2 + n;
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}, 0);
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};
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var byteToBitArr = function (bite)
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{
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var a = [];
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for (var i = 7; i >= 0; i--)
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{
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a.push(!!(bite & (1 << i)));
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}
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return a;
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};
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// Stream
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/**
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* @constructor
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*/
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// Make compiler happy.
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var Stream = function (data)
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{
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this.data = data;
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this.len = this.data.length;
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this.pos = 0;
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this.readByte = function ()
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{
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if (this.pos >= this.data.length)
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{
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throw new Error('Attempted to read past end of stream.');
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}
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if (data instanceof Uint8Array)
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return data[this.pos++];
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else
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return data.charCodeAt(this.pos++) & 0xFF;
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};
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this.readBytes = function (n)
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{
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var bytes = [];
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for (var i = 0; i < n; i++)
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{
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bytes.push(this.readByte());
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}
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return bytes;
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};
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this.read = function (n)
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{
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var s = '';
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for (var i = 0; i < n; i++)
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{
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s += String.fromCharCode(this.readByte());
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}
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return s;
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};
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this.readUnsigned = function ()
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{ // Little-endian.
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var a = this.readBytes(2);
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return (a[1] << 8) + a[0];
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};
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};
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var lzwDecode = function (minCodeSize, data)
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{
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// TODO: Now that the GIF parser is a bit different, maybe this should get an array of bytes instead of a String?
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var pos = 0; // Maybe this streaming thing should be merged with the Stream?
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var readCode = function (size)
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{
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var code = 0;
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for (var i = 0; i < size; i++)
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{
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if (data.charCodeAt(pos >> 3) & (1 << (pos & 7)))
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{
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code |= 1 << i;
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}
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pos++;
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}
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return code;
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};
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var output = [];
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var clearCode = 1 << minCodeSize;
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var eoiCode = clearCode + 1;
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var codeSize = minCodeSize + 1;
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var dict = [];
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var clear = function ()
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{
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dict = [];
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codeSize = minCodeSize + 1;
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for (var i = 0; i < clearCode; i++)
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{
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dict[i] = [i];
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}
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dict[clearCode] = [];
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dict[eoiCode] = null;
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};
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var code;
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var last;
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while (true)
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{
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last = code;
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code = readCode(codeSize);
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if (code === clearCode)
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{
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clear();
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continue;
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}
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if (code === eoiCode) break;
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if (code < dict.length)
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{
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if (last !== clearCode)
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{
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dict.push(dict[last].concat(dict[code][0]));
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}
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}
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else
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{
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if (code !== dict.length) throw new Error('Invalid LZW code.');
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dict.push(dict[last].concat(dict[last][0]));
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}
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output.push.apply(output, dict[code]);
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if (dict.length === (1 << codeSize) && codeSize < 12)
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{
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// 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.
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codeSize++;
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}
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}
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// I don't know if this is technically an error, but some GIFs do it.
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//if (Math.ceil(pos / 8) !== data.length) throw new Error('Extraneous LZW bytes.');
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return output;
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};
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// The actual parsing; returns an object with properties.
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var parseGIF = function (st, handler)
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{
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handler || (handler = {});
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// LZW (GIF-specific)
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var parseCT = function (entries)
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{ // Each entry is 3 bytes, for RGB.
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var ct = [];
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for (var i = 0; i < entries; i++)
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{
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ct.push(st.readBytes(3));
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}
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return ct;
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};
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var readSubBlocks = function ()
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{
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var size, data;
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data = '';
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do
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{
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size = st.readByte();
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data += st.read(size);
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} while (size !== 0);
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return data;
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};
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var parseHeader = function ()
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{
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var hdr = {};
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hdr.sig = st.read(3);
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hdr.ver = st.read(3);
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if (hdr.sig !== 'GIF') throw new Error('Not a GIF file.'); // XXX: This should probably be handled more nicely.
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hdr.width = st.readUnsigned();
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hdr.height = st.readUnsigned();
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var bits = byteToBitArr(st.readByte());
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hdr.gctFlag = bits.shift();
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hdr.colorRes = bitsToNum(bits.splice(0, 3));
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hdr.sorted = bits.shift();
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hdr.gctSize = bitsToNum(bits.splice(0, 3));
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hdr.bgColor = st.readByte();
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hdr.pixelAspectRatio = st.readByte(); // if not 0, aspectRatio = (pixelAspectRatio + 15) / 64
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if (hdr.gctFlag)
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{
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hdr.gct = parseCT(1 << (hdr.gctSize + 1));
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}
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handler.hdr && handler.hdr(hdr);
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};
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var parseExt = function (block)
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{
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var parseGCExt = function (block)
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{
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var blockSize = st.readByte(); // Always 4
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var bits = byteToBitArr(st.readByte());
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block.reserved = bits.splice(0, 3); // Reserved; should be 000.
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block.disposalMethod = bitsToNum(bits.splice(0, 3));
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block.userInput = bits.shift();
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block.transparencyGiven = bits.shift();
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block.delayTime = st.readUnsigned();
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block.transparencyIndex = st.readByte();
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block.terminator = st.readByte();
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handler.gce && handler.gce(block);
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};
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var parseComExt = function (block)
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{
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block.comment = readSubBlocks();
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handler.com && handler.com(block);
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};
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var parsePTExt = function (block)
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{
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// No one *ever* uses this. If you use it, deal with parsing it yourself.
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var blockSize = st.readByte(); // Always 12
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block.ptHeader = st.readBytes(12);
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block.ptData = readSubBlocks();
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handler.pte && handler.pte(block);
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};
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var parseAppExt = function (block)
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{
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var parseNetscapeExt = function (block)
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{
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var blockSize = st.readByte(); // Always 3
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block.unknown = st.readByte(); // ??? Always 1? What is this?
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block.iterations = st.readUnsigned();
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block.terminator = st.readByte();
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handler.app && handler.app.NETSCAPE && handler.app.NETSCAPE(block);
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};
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var parseUnknownAppExt = function (block)
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{
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block.appData = readSubBlocks();
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// FIXME: This won't work if a handler wants to match on any identifier.
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handler.app && handler.app[block.identifier] && handler.app[block.identifier](block);
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};
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var blockSize = st.readByte(); // Always 11
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block.identifier = st.read(8);
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block.authCode = st.read(3);
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switch (block.identifier)
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{
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case 'NETSCAPE':
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parseNetscapeExt(block);
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break;
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default:
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parseUnknownAppExt(block);
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break;
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}
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};
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var parseUnknownExt = function (block)
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{
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block.data = readSubBlocks();
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handler.unknown && handler.unknown(block);
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};
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block.label = st.readByte();
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switch (block.label)
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{
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case 0xF9:
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block.extType = 'gce';
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parseGCExt(block);
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break;
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case 0xFE:
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block.extType = 'com';
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parseComExt(block);
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break;
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case 0x01:
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block.extType = 'pte';
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parsePTExt(block);
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break;
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case 0xFF:
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block.extType = 'app';
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parseAppExt(block);
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break;
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default:
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block.extType = 'unknown';
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parseUnknownExt(block);
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break;
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}
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};
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var parseImg = function (img)
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{
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var deinterlace = function (pixels, width)
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{
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// Of course this defeats the purpose of interlacing. And it's *probably*
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||
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// the least efficient way it's ever been implemented. But nevertheless...
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||
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var newPixels = new Array(pixels.length);
|
||
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var rows = pixels.length / width;
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var cpRow = function (toRow, fromRow)
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{
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var fromPixels = pixels.slice(fromRow * width, (fromRow + 1) * width);
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||
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newPixels.splice.apply(newPixels, [toRow * width, width].concat(fromPixels));
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};
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// See appendix E.
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||
|
|
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 src = options.src;
|
||
|
|
|
||
|
|
if (!options.gif)
|
||
|
|
{
|
||
|
|
options.gif = document.createElement("img");
|
||
|
|
options.gif.setAttribute("rel:animated_src", src);
|
||
|
|
//options.gif.setAttribute("rel:auto_play", "1");
|
||
|
|
options.gif.src = "";
|
||
|
|
}
|
||
|
|
|
||
|
|
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);
|
||
|
|
|
||
|
|
options.canvas.getContext("2d").drawImage(canvas, options.x, options.y)
|
||
|
|
};
|
||
|
|
|
||
|
|
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.style.display = 'none';
|
||
|
|
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 if (options.max_height && hdr && hdr.height > options.max_height)
|
||
|
|
{
|
||
|
|
scale = options.max_height / hdr.height;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
scale = 1;
|
||
|
|
}
|
||
|
|
return scale;
|
||
|
|
}
|
||
|
|
|
||
|
|
var canvas, ctx, toolbar, tmpCanvas;
|
||
|
|
var initialized = false;
|
||
|
|
var load_callback = false;
|
||
|
|
var first_time = true;
|
||
|
|
|
||
|
|
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,
|
||
|
|
|
||
|
|
// mjb
|
||
|
|
getX: function ()
|
||
|
|
{
|
||
|
|
return options.x;
|
||
|
|
},
|
||
|
|
setX: function (value)
|
||
|
|
{
|
||
|
|
options.x = value;
|
||
|
|
},
|
||
|
|
getY: function ()
|
||
|
|
{
|
||
|
|
return options.y;
|
||
|
|
},
|
||
|
|
setY: function (value)
|
||
|
|
{
|
||
|
|
options.y = value;
|
||
|
|
},
|
||
|
|
setFirstTime: function ()
|
||
|
|
{
|
||
|
|
first_time = true;
|
||
|
|
}
|
||
|
|
|
||
|
|
};
|
||
|
|
};
|
||
|
|
|
||
|
|
return SuperGif;
|
||
|
|
}));
|
||
|
|
|