Aura Comic cbr with WebP images

[matteo.piccioni]

Hello,
is Aura One able to read comic in cbr format with WebP images instead of jpg images?

Thanks

[davidfor]

I don't know, but my bet would be no. Have you tried? You have an Aura ONE, if it doesn't work, it might reboot the device. The absolute worst case is needing a factory reset.

[matteo.piccioni]

I have not tried, but I will try as soon as possible
thanks

[ZodWallop]

I love my e-ink reader. I really do.

But, I don't get reading a comic on one. It's just not what they're designed for.

Sorry. That doesn't help with your question at all. Just wandering through giving unwanted opinions...

[Amiieey]

Maybe it can- CBR is basically just a .zip file of images reformatted into a CBR. But I would be safe and use jpg just in case.

[DNSB]

Originally Posted by Amiieey

Maybe it can- CBR is basically just a .zip file of images reformatted into a CBR. But I would be safe and use jpg just in case.

I haven't tried WebP images on my Kobo but the only web browsers that seem to be able to display WebP images are Chrome and it's derivatives (including Opera in that list).

[Amiieey]

Originally Posted by DNSB

I haven't tried WebP images on my Kobo but the only web browsers that seem to be able to display WebP images are Chrome and it's derivatives (including Opera in that list).

Awww man. I stand corrected!

[matteo.piccioni]

I confirm, WebP doesnt works

[Frenzie]

Originally Posted by DNSB

I haven't tried WebP images on my Kobo but the only web browsers that seem to be able to display WebP images are Chrome and it's derivatives (including Opera in that list).

Real Opera also supported WebP, but any browser that supports WebM can display WebP with a clever workaround.

https://antimatter15.com/2010/10/wep...simpler-usage/

weppy.user.js

// ==UserScript==
// @name		WebP Support
// @author 		Frenzie, antimatter15
// @version		1.0
// @namespace		http://extendopera.org/userjs/content/wepb-support
// @description		Supports WebP by converting it to a 1 frame WebM movie.
// @include		*
// ==/UserScript==
// Changelog
// 1.0 Oct 8, 2010. Initial release. Removed canvas rendering code from original for reduced complexity.

(function () {

/*
	Copyright (c) 2010 antimatter15 (antimatter15@gmail.com)

	Permission is hereby granted, free of charge, to any person obtaining a copy
	of this software and associated documentation files (the "Software"), to deal
	in the Software without restriction, including without limitation the rights
	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	copies of the Software, and to permit persons to whom the Software is
	furnished to do so, subject to the following conditions:

	The above copyright notice and this permission notice shall be included in
	all copies or substantial portions of the Software.

	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	THE SOFTWARE.
*/

var WebM = (function(){
	//parse a RIFF encoded media file such as WebP
	function parseRIFF(string){
		var offset = 0;
		var chunks = {};
		while(offset < string.length){
			var id = string.substr(offset, 4);
			var len = parseInt(string.substr(offset+4, 4).split('').map(function(i){
				var unpadded = i.charCodeAt(0).toString(2);
				return (new Array(8 - unpadded.length + 1)).join('0') + unpadded
			}).join(''),2);
			var data = string.substr(offset + 4 + 4, len);
			offset += 4 + 4 + len;
			chunks[id] = chunks[id] || [];
			if(id == 'RIFF'){
				chunks[id].push(parseRIFF(data));
			}else if(id == 'LIST'){
				chunks[id].push(parseRIFF(data));
			}else{
				chunks[id].push(data)
			}
			
		}
		return chunks
	}

	//Converting between a string of 0010101001's and binary back and forth is probably inefficient
	//TODO: get rid of this function
	function toBinStr(bits){
		var data = '';
		var pad = (bits.length % 8) ? (new Array(1 + 8 - (bits.length % 8))).join('0') : '';
		bits = pad + bits;
		for(var i = 0; i < bits.length; i+= 8){
			data += String.fromCharCode(parseInt(bits.substr(i,8),2))
		}
		return data;
	}

	function parseWebP(riff){
		var VP8 = riff.RIFF[0].WEBP[0];
		var frame_start = VP8.indexOf('\x9d\x01\x2a'); //A VP8 keyframe starts with the 0x9d012a header
		for(var i = 0, c = []; i < 4; i++) c[i] = VP8.charCodeAt(frame_start + 3 + i);
		
		var width, horizontal_scale, height, vertical_scale, tmp;
		
		//the code below is literally copied verbatim from the bitstream spec
		tmp = (c[1] << 8) | c[0];
		width = tmp & 0x3FFF;
		horizontal_scale = tmp >> 14;
		tmp = (c[3] << 8) | c[2];
		height = tmp & 0x3FFF;
		vertical_scale = tmp >> 14;
		return {
			width: width,
			height: height,
			data: VP8,
			riff: riff
		}
	}


	//this is a smaller version of http://github.com/antimatter15/js-ebml
	
	function generateEBML(json){
		var ebml = '';
		for(var i = 0; i < json.length; i++){
			var data = json[i].data;

			if(typeof data == 'object') data = generateEBML(data);
			
			var len = data.length;
			var zeroes = Math.ceil(Math.ceil(Math.log(len)/Math.log(2))/8);
			var size_str = len.toString(2);
			var padded = (new Array((zeroes * 7 + 7 + 1) - size_str.length)).join('0') + size_str;
			var size = (new Array(zeroes)).join('0') + '1' + padded;
			

			var element = '';
			element += toBinStr(parseInt(json[i].hex, 16).toString(2));
			element += toBinStr(size);
			
			element += data;
			ebml += element;
			
		}
		return ebml;
	}

	function toWebM(image){

var EBML = [
	{
		"data": [
			{
				"data": "\u0001",
				"name": "EBMLVersion",
				"hex": "4286"
			},
			{
				"data": "\u0001",
				"name": "EBMLReadVersion",
				"hex": "42f7"
			},
			{
				"data": "\u0004",
				"name": "EBMLMaxIDLength",
				"hex": "42f2"
			},
			{
				"data": "\u0008",
				"name": "EBMLMaxSizeLength",
				"hex": "42f3"
			},
			{
				"data": "webm",
				"name": "DocType",
				"hex": "4282"
			},
			{
				"data": "\u0002",
				"name": "DocTypeVersion",
				"hex": "4287"
			},
			{
				"data": "\u0002",
				"name": "DocTypeReadVersion",
				"hex": "4285"
			}
		],
		"name": "EBML",
		"hex": "1a45dfa3"
	},
	{
		"data": [
			{
				"data": [
					{
						"data": "\u000fB@",
						"name": "TimecodeScale",
						"hex": "2ad7b1"
					},
					{
						"data": "Lavf52.79.0",
						"name": "MuxingApp",
						"hex": "4d80"
					},
					{
						"data": "Lavf52.79.0",
						"name": "WritingApp",
						"hex": "5741"
					},
					{
						"data": "T«”h¿Y¬+“ùRö\u000fö×C",
						"name": "SegmentUID",
						"hex": "73a4"
					},
					{
						"data": "@D\u0000\u0000\u0000\u0000\u0000\u0000",
						"name": "Duration",
						"hex": "4489"
					}
				],
				"name": "Info",
				"hex": "1549a966"
			},
			{
				"data": [
					{
						"data": [
							{
								"data": "\u0001",
								"name": "TrackNumber",
								"hex": "d7"
							},
							{
								"data": "\u0001",
								"name": "TrackUID",
								"hex": "73c5"
							},
							{
								"data": "\u0000",
								"name": "FlagLacing",
								"hex": "9c"
							},
							{
								"data": "und",
								"name": "Language",
								"hex": "22b59c"
							},
							{
								"data": "V_VP8",
								"name": "CodecID",
								"hex": "86"
							},
							{
								"data": "\u0001",
								"name": "TrackType",
								"hex": "83"
							},
							{
								"data": "\u0002bZ\u0000",
								"name": "DefaultDuration",
								"hex": "23e383"
							},
							{
								"data": [
									{
										"data": toBinStr(image.width.toString(2)),
										"name": "PixelWidth",
										"hex": "b0"
									},
									{
										"data": toBinStr(image.height.toString(2)),
										"name": "PixelHeight",
										"hex": "ba"
									}
								],
								"name": "Video",
								"hex": "e0"
							}
						],
						"name": "TrackEntry",
						"hex": "ae"
					}
				],
				"name": "Tracks",
				"hex": "1654ae6b"
			},
			{
				"data": [
					{
						"data": "\u0000",
						"name": "Timecode",
						"hex": "e7"
					},
					{
						"data": '\x81\x00\x00\x80'+image.data.substr(4),
						"name": "SimpleBlock",
						"hex": "a3"
					}
				],
				"name": "Cluster",
				"hex": "1f43b675"
			}
		],
		"name": "Segment",
		"hex": "18538067"
	}
];

return generateEBML(EBML);

	}

	function toDataURL(webm){
		return 'data:video/webm,' + escape(webm);
	}


	//from http://diveintohtml5.org/everything.html
	function canPlayWebM(){
		var v = document.createElement('video');
		return !!(v.canPlayType && v.canPlayType('video/webm; codecs="vp8, vorbis"').replace(/no/, ''));
	}


	function renderWebP(url, callback){
		//if it can't play webM what's the point?
		if(!canPlayWebM()) return callback('http://www.motifake.com/image/demotivational-poster/0902/urine-urine-pee-cheap-demotivational-poster-1234913145.jpg');
		var xhr = new XMLHttpRequest();
		xhr.open('GET', url, true);
		xhr.overrideMimeType('text/plain; charset=x-user-defined');


		xhr.onload = function(){
			var binary = xhr.responseText.split('').map(function(e){return String.fromCharCode(e.charCodeAt(0) & 0xff)}).join('');
			var webP = parseWebP(parseRIFF(binary));
			
			var video = document.createElement('video');

			video.width = webP.width;
			video.height = webP.height;

			var src = toDataURL(toWebM(webP));

			video.src = src;
			callback(video);
		}
		xhr.send(null);
	}

	function renderImage(image, callback){
		renderWebP(image.src, function(canvas){
			var result = null;
			if(callback) result = callback(image, canvas);
			
			if(image.parentNode && result !== false){
				for(var i = 0; i < image.attributes.length; i++){
					if (image.attributes[i].name != 'src')
						canvas.setAttribute(image.attributes[i].name, image.attributes[i].value)
				}
				image.parentNode.replaceChild(canvas, image);
			}
		})
	}

	function processImages(callback){
		var origin = location.protocol+'//'+location.host;
		for(var i = document.images, l = i.length; l--;){
			if(i[l].src.indexOf(origin) == 0 && /\.webp$/.test(i[l].src)){
				renderImage(i[l],callback);
			}
		}
	}

	return {
		processImages: processImages,
		renderImage: renderImage,
		renderWebP: renderWebP
	}
})();

// Perform conversion on DOMContentLoaded
WebM.processImages();

})();