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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="description" content="[MAZ01001.github.io] GIF decoding and rendering with native JavaScript and HTML5 canvas">
<meta name="author" content="MAZ01001">
<link rel="apple-touch-icon" sizes="180x180" href="../img/apple-touch-icon.png">
<link rel="icon" type="image/x-icon" href="../img/MAZ_logo.svg">
<link rel="icon" type="image/png" sizes="32x32" href="../img/favicon-32x32.png">
<link rel="icon" type="image/png" sizes="16x16" href="../img/favicon-16x16.png">
<link rel="manifest" href="../img/site.webmanifest">
<link rel="mask-icon" href="../img/safari-pinned-tab.svg" color="#ff9900">
<link rel="shortcut icon" href="../img/favicon.ico">
<meta name="msapplication-TileColor" content="#da532c">
<meta name="msapplication-config" content="../img/browserconfig.xml">
<meta name="theme-color" content="#ffffff">
<title>GIF decoder</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<noscript>This page needs JavaScript to work</noscript>
<div id="box">
<h1 id="gifHeading">GIF<span class="hint" title="Only supports GIF files with version "GIF89a"">*</span> decoder</h1>
<!-- TODO
! add toggles to URL parameters & as button left of playback controls
- >> ? when toggling any of these → redraw GIF ?!
- >> (ON) for clear at [0] (ignores last disposal nmethod) ~ seeks from [0] to frameIndex if frameIndex < frameIndexLast ~ also more performant for reverse play
- >> (ON) for forcing background color to be transparent when restoring to background color
- >> (OFF) for true inverse render ~ when reverse play render from frameIndexLast to frameIndex ~ disposal methods are also in reverse ~ probably faster but visually unexpected
- >> (OFF) for no drawing text extension
! new canvas button to change canvas background/-color
- >> dialog menu with some options and a live preview
- >> toggle to use backgroud color index (disabled in OFF state if not available and disables all following inputs if toggled ON)
- >> >> color input for background color
- >> >> checkbox to toggle checker texture and enable checker color (second color input)
- >> >> presets white/bright/dark/black/transparent/custom
- >> >> >> checker-a, -b, and -len (see CSS#L176)
! implement pixel aspect ratio via CSS transforms
! implement failsaves when loading/reading corrupted/incomplete files
? auto hide gifView buttons after 1sec no mouse movement (js mouse move) or mouse leaves div (css hover)
? useless/verbose stats
? (AppExt) raw bytes as hex string (textarea) ~ instead of copy button ? both
? add [byte position] to title ~ comment, application/unkown extension, and global/local color table
? create example GIF file with all known features - https://www.w3.org/Graphics/GIF/spec-gif89a.txt - via GIMP and then edit in HEX-editor ~ create empty file with new size then override all bytes (since vscode-hexeditor can't add bytes...yet)
- >> - 500*500 px total
- >> - 30 frames
- >> - irregular frame delays
- >> - not full frame changes (frames are smaller than whole GIF)
- >> - every disposal method
- >> - ! requires some planning in the frame image contents ~ visually
- >> - loops 3 times
- >> - global color table and at least one local color table (can be a copy of global color table)
- >> - use transparency of local color table
- >> - user input flag on at least two frames (with and without timeout)
- >> - unknown app extension
- >> - 0x21FF0C544553545F4150502045585400
- >> - text extensions for first 10 frames (graphics control extension > image descriptor > [text extension] > image data)
- >> - 0x21010C0A000A00200010000408 <forground_global_color_index_1B> <background_global_color_index_1B> 105445585420666F726672616D655B305D00
- >> - 0x21010C0A000A00200010000408 <forground_global_color_index_1B> <background_global_color_index_1B> 105445585420666F726672616D655B315D00
- >> - 0x21010C0A000A00200010000408 <forground_global_color_index_1B> <background_global_color_index_1B> 105445585420666F726672616D655B325D00
- >> - 0x21010C0A000A00200010000408 <forground_global_color_index_1B> <background_global_color_index_1B> 105445585420666F726672616D655B335D00
- >> - 0x21010C0A000A00200010000408 <forground_global_color_index_1B> <background_global_color_index_1B> 105445585420666F726672616D655B345D00
- >> - 0x21010C0A000A00200010000408 <forground_global_color_index_1B> <background_global_color_index_1B> 105445585420666F726672616D655B355D00
- >> - 0x21010C0A000A00200010000408 <forground_global_color_index_1B> <background_global_color_index_1B> 105445585420666F726672616D655B365D00
- >> - 0x21010C0A000A00200010000408 <forground_global_color_index_1B> <background_global_color_index_1B> 105445585420666F726672616D655B375D00
- >> - 0x21010C0A000A00200010000408 <forground_global_color_index_1B> <background_global_color_index_1B> 105445585420666F726672616D655B385D00
- >> - 0x21010C0A000A00200010000408 <forground_global_color_index_1B> <background_global_color_index_1B> 105445585420666F726672616D655B395D00
- >> - comment after image descriptor and before image data for the last frame
- >> - 0x21FE4D5445535420636F6D6D656E740D0A616674657220696D6167652064657363726970746F7220616E64206265666F726520696D616765206461746120666F7220746865206C617374206672616D6500
- >> - comment after image descriptor and before image data for the 10th frame
- >> - 0x21FE4D5445535420636F6D6D656E740D0A616674657220696D6167652064657363726970746F7220616E64206265666F726520696D616765206461746120666F72207468652031307468206672616D6500
- >> - comment after image descriptor and before image data for the 100th frame
- >> - 0x21FE4E5445535420636F6D6D656E740D0A616674657220696D6167652064657363726970746F7220616E64206265666F726520696D616765206461746120666F7220746865203130307468206672616D6500
- >> - unknown extensions (after image data (and app extension) of frames 0-3)
- >> - unknown extension 0
- >> - 0x2154115445535420657874656E73696F6E20233000
- >> - unknown extension 1
- >> - 0x2145115445535420657874656E73696F6E20233100
- >> - unknown extension 2
- >> - 0x2153115445535420657874656E73696F6E20233200
- >> - unknown extension 3
- >> - 0x2154115445535420657874656E73696F6E20233300
? make calculating frame index/time and rendering into functions for the GIFdecodeModule.js and the GIF decode section at the beginning of this file
- >> seekGIFplayback(GIF,loopIndex,loopLength,currentFrameIndex,currentTime,seekDeltaTime,skipUserInput?)=>[newLoopIndex,newFrameIndex,newTime,paused]
- >> renderGIFplayback(GIF,currentFrameIndex,newFrameIndex,options:{viewCanvas,frameCanvas,storeCanvas,forceClearStart,forceTransparentBackground,reverseRender,???})=>??? ~ maybe generator function
-->
<div id="gifView" title="GIF render canvas">
<canvas id="htmlCanvas">Your browser does not support the HTML canvas element</canvas>
<div id="gifLoad" title="Shows current decoding progress">
<span id="gifLoadText">Loading...</span>
<progress id="gifLoadProgress"></progress>
<div>
<input type="button" id="gifLoadPause" value="Pause" data-toggle="0" title="Toggle pausing decoding process temporarily">
<input type="button" id="gifLoadAbort" value="Abort" title="Abort decoding process and reopen import menu">
</div>
</div>
<div id="gifViewButtons">
<input type="button" id="fullWindow" data-toggle="0" title="Toggle canvas fullscreen window" value="⤢">
<input type="button" id="fitWindow" data-toggle="0" title="Toggle between fit to window (🞕) and actual size (🞑)" value="🞕">
<input type="button" id="imgSmoothing" data-toggle="0" title="Toggle between pixelated (🙾) and smooth (🙼) image rendering" value="🙾">
</div>
<span id="gifFPS" title="Shows FPS for GIF canvas (not related to GIF speed)">fps -</span>
</div>
<label for="timeRange" title="Current timestamp (with frame timestamps in tickmarks below)">Time: <input type="range" id="timeRange" list="timeTickmarks" aria-disabled="true" tabindex="-1"> <span id="time">-</span> ms</label>
<datalist id="timeTickmarks"></datalist>
<label for="frameRange" title="Current frame index (zero-based)">Frame: <input type="range" id="frameRange" step="1"> <span id="frame">-</span></label>
<div id="overrideOptions">
<input type="button" id="overrideMenu" data-toggle="0" value="Override">
<div>
<p>Override default render behaviour <small>(WIP)</small></p>
<label for="overrideFrames" title="greatly improves playback performance in either direction at the cost of memory - about as much memory as the GIF itself"><input type="checkbox" id="overrideFrames"> Prerender frames <input type="button" id="overrideFramesRender" data-render="0" value="Render now" title="Re-render frames now (with current override settings)"> <small>(includes current overrides)</small></label>
<label for="overrideClear" title="Allways clears the canvas between the last and the first frame - ignoring the disposal method of the last frame"><input type="checkbox" id="overrideClear"> Clear canvas on frame 0 <small>(slightly improves the performance impact of reverse playback)</small></label>
<label for="overrideBackground" title="Allways uses transparent when restoring to backgrond color (sets drawn pixels transparent) - ignoring the background color and the transparency color of the current frame"><input type="checkbox" id="overrideBackground"> Restoring to background color is allways transparent</label>
<label for="overrideText" title="Ignores the text extension of the current frame"><input type="checkbox" id="overrideText"> Don't render text extension</label>
<label for="overrideRender" title="Renders frames in reverse order (to the left on the timeline instead of to the right) - may look very weird"><input type="checkbox" id="overrideRender"> Inverse render order <small>(just for fun - swaps performance impact for forward/reverse playback)</small></label>
<!-- TODO add overrideDelay "ignore frame delay" provide input field with custom delay (ms) finite and >0 -->
<!-- TODO make override menu area scrollable and smaller in height so more overrides fit within -->
</div>
</div>
<div id="playerControls" class="paused">
<input type="button" id="seekStart" value="⏮" title="first frame (paused)">
<input type="button" id="seekPrevious" value="⇤" title="previous frame (paused)">
<input type="button" id="reverse" value="⏴" title="reverse play">
<input type="button" id="pause" value="⏸" title="pause">
<input type="button" id="play" value="⏵" title="play">
<input type="button" id="seekNext" value="⇥" title="next frame (paused)">
<input type="button" id="seekEnd" value="⏭" title="last frame (paused)">
</div>
<input type="number" id="speed" value="1" min="0" max="100" step="any" placeholder="1" title="playback speed multiplier [0 to 100] (use arrow keys with shift/ctrl/alt for more precision)">
<fieldset id="userInputArea"><legend title="If highlighted blue needs user input to continue playback">User input</legend>
<label for="userInputTimeout" title="Timeout for current frame (if present / when waiting for user input)">Timeout: <progress id="userInputTimeout" value></progress> <span id="userInputTimeoutTime">-</span> ms</label>
<input type="button" id="userInput" title="Click to continue playing GIF" value="Continue">
<input type="button" id="userInputLock" data-toggle="0" title="Click to toggle instant user input" value="Lock">
</fieldset>
<fieldset id="loopArea"><legend title="Control GIF looping behaviour">Loop override</legend>
<span title="Shows current and maximum GIF loop amount"><span id="loopText">-</span> Loops</span>
<input type="button" id="loopForce" data-toggle="0" title="Click to (toggle) force infinite repeats" value="Force infinite">
</fieldset>
<div id="infoPanels">
<div>
<input type="button" id="open" value="Open GIF" title="Click to open the import menu">
<a id="github" target="_blank" rel="noopener noreferrer" href="https://github.com/MAZ01001/GIF_decoder" title="GitHub project with documentation">Documentation & source code</a>
</div>
<fieldset><legend title="General information about the GIF">GIF info</legend>
<details open id="detailsGIFInfo"><summary>Click to toggle contents</summary>
<div id="gifInfoArea">
<table>
<tr><th>Name</th><th>Value</th></tr>
<tr title="The filename of the GIF currently loaded"><td>Filename</td><td id="fileName">____</td></tr>
<tr title="The width*height of the entire GIF"><td>Size</td><td><span id="totalWidth">-</span> * <span id="totalHeight">-</span> px</td></tr>
<tr title="The amount of frames in this GIF"><td>Total frames</td><td id="totalFrames">-</td></tr>
<tr title="The (maximum) total time of the entire GIF"><td>Total Time</td><td id="totalTime">-</td></tr>
<tr title="The Pixel aspect ratio of the GIF"><td>Pixel aspect ratio</td><td id="pixelAspectRatio">-:-</td></tr>
<tr title="The color resolution of the GIF"><td>Color resolution</td><td id="colorRes">-</td></tr>
<tr title="The index of the color used for the background (if available)"><td>Background color</td><td id="backgroundColorIndex">-</td></tr>
</table>
<fieldset><legend title="The global color table of the GIF">Global color table</legend>
<details open id="detailsGlobalColorTable"><summary>Click to toggle contents</summary>
<div id="globalColorTable"><span>Loading...</span></div>
</details>
</fieldset>
<fieldset><legend title="Application-Extensions in the GIF file">Application-Extensions</legend>
<details open id="detailsAppExtList"><summary>Click to toggle contents</summary>
<div id="appExtList"><span>Loading...</span></div>
</details>
</fieldset>
<fieldset><legend title="Comments in the GIF file and the frame index of where they were found">Comments</legend>
<details id="detailsCommentsList"><summary>Click to toggle contents</summary>
<div id="commentsList"><span>Loading...</span></div>
</details>
</fieldset>
<fieldset><legend title="Unknown extensions in the GIF file">Unknown extensions</legend>
<details id="detailsUnExtList"><summary>Click to toggle contents</summary>
<div id="unExtList"><span>Loading...</span></div>
</details>
</fieldset>
</div>
</details>
</fieldset>
<fieldset><legend title="Information of the currently displayed frame">Frame info</legend>
<details id="detailsFrameView"><summary>Click to toggle frame canvas</summary>
<div id="frameView" title="Frame render canvas">
<canvas id="htmlFrameCanvas">Your browser does not support the HTML canvas element</canvas>
<div id="frameLoad" title="Shows current decoding progress">
<span id="frameLoadText">Loading...</span>
<progress id="frameLoadProgress"></progress>
</div>
<div id="frameViewButtons">
<input type="button" id="frameFullWindow" data-toggle="0" title="Toggle canvas fullscreen window" value="⤢">
<input type="button" id="frameFitWindow" data-toggle="0" title="Toggle between fit to window (🞕) and actual size (🞑)" value="🞕">
<input type="button" id="frameImgSmoothing" data-toggle="0" title="Toggle between pixelated (🙾) and smooth (🙼) image rendering" value="🙾">
</div>
<span id="frameFPS" title="Shows FPS for frame canvas (not related to GIF speed)">fps -</span>
</div>
</details>
<details id="detailsFrameInfo"><summary>Click to toggle contents</summary>
<div id="frameInfoArea">
<table>
<tr><th>Name</th><th>Value</th></tr>
<tr title="The width*height of the current frame"><td>Size</td><td><span id="frameWidth">-</span> * <span id="frameHeight">-</span> px</td></tr>
<tr title="The position of the current frame from the left/top edge of the GIF"><td>Position</td><td><span id="frameLeft">-</span> / <span id="frameTop">-</span> px</td></tr>
<tr title="How long this frame is displayed for"><td>Time</td><td id="frameTime">- ms</td></tr>
<tr title="If the user input flag is set for the current frame"><td>User input flag</td><td><input type="checkbox" id="frameUserInputFlag" disabled></td></tr>
<tr title="The index of the color that is used for transparency (if available)"><td>Transparent color</td><td id="transparentColorIndex">-</td></tr>
<tr title="The disposal method of the current frame"><td>Disposal method</td><td id="frameDisposalMethod">[- ____]<br>________</td></tr>
<tr title="2bits reserved for future use (from a packed field in the image descriptor block)"><td>Reserved field (ID)</td><td id="frameReserved">- (0b00)</td></tr>
<tr title="3bits reserved for future use (from a packed field in the graphics control extension block)"><td>Reserved field (GC)</td><td id="frameGCReserved">- (0b000)</td></tr>
</table>
<fieldset><legend>Local color table</legend>
<details open id="detailsFrameColorTable"><summary>Click to toggle contents</summary>
<div id="frameColorTable"><span>Loading...</span></div>
</details>
</fieldset>
<fieldset><legend title="Text that is displayed during this frame">Text</legend>
<details id="detailsFrameTextInfo"><summary>Click to toggle contents</summary>
<div id="frameTextArea">
<table>
<tr><th>Name</th><th>Value</th></tr>
<tr title="The text to display on the current frame"><td>String</td><td id="frameText">____</td></tr>
<tr title="The width*height of the character grid"><td>Grid size</td><td><span id="frameTextWidth">-</span> * <span id="frameTextHeight">-</span> px</td></tr>
<tr title="The position of the character grid from the left/top edge of the GIF"><td>Grid position</td><td><span id="frameTextLeft">-</span> / <span id="frameTextTop">-</span> px</td></tr>
<tr title="The width*height for each cell in the character grid"><td>Character size</td><td><span id="frameTextCharWidth">-</span> * <span id="frameTextCharHeight">-</span> px</td></tr>
<tr title="The foreground color of the text (click to copy hex code)"><td>Foreground</td><td><input type="color" id="frameTextCharForeground"></td></tr>
<tr title="Teh background color of the text (click to copy hex code)"><td>Background</td><td><input type="color" id="frameTextCharBackground"></td></tr>
</table>
</div>
</details>
</fieldset>
</div>
</details>
</fieldset>
</div>
</div>
<div id="copyNote">copied to clipboard</div>
<dialog id="importMenu">
<h2>Import</h2>
<fieldset><legend title="Load a GIF from URL or a file">Load a GIF file</legend>
<label for="importURL" title="Load GIF from URL">URL: <input type="url" id="importURL" placeholder="https://example.com/test.gif"></label>
<p>-- OR --</p>
<label for="importFile" title="Load local GIF file">File: <input type="file" id="importFile" accept=".gif"></label>
</fieldset>
<p id="importWarn" title="Shows error message/reason (from last import/decoding attempt)"></p>
<fieldset><legend title="Preview of selected GIF">GIF preview</legend>
<img id="importPreview" alt="GIF img preview">
</fieldset>
<div id="importActions">
<input type="button" id="importConfirm" disabled value="Start" title="Start decoding GIF">
<input type="button" id="importAbort" autofocus value="Abort" title="Close import menu">
</div>
</dialog>
<dialog id="confirmMenu">
<h2>Are you sure?</h2>
<span id="confirmText">________</span>
<div>
<input type="button" id="confirmConfirm" value="OK" title="confirm action">
<input type="button" id="confirmAbort" value="Abort" title="abort action" autofocus>
</div>
</dialog>
<script src="./script.js"></script>
</body>
</html>