$DBversion = 'XXX'; # will be replaced by the RM

if( CheckVersion( $DBversion ) ) {

    $dbh->do(q|

        INSERT IGNORE INTO systempreferences ( `variable`, `value`, `options`, `explanation`, `type` ) VALUES

        ('OPACDetailQRCode','0','','Enable the display of a QR Code on the OPAC detail page','YesNo');

    |);

    SetVersion( $DBversion );

    print "Upgrade to $DBversion done (Bug 23566 - Add OPACDetailQRCode system preference)\n";

}

            <h2>kjua</h2>

            <p><a href="https://larsjung.de/kjua/">kjua</a> by Lars Jung is a JavaScript library that generates QR codes, licensed under the <a href="https://github.com/lrsjng/kjua/blob/master/README.md">MIT license</a>.</p>

            - pref: OPACDetailQRCode

              choices:

                  yes: Enable

                  no: "Don't enable"

            - the option to show a QR Code on the OPAC bibliographic detail page.

        -

    &.show_qrcode {

        @extend %initial_icon;

        background-position: 0 -1164px; /* QR Code */

        padding-left: 35px;

    }

#qrcode {

    margin-left: 35px;

    img,

    canvas {

        margin-top: 1em;

    }

}

    [% IF ( Koha.Preference('OPACDetailQRCode' ) ) %]

        <li>

            <a class="show_qrcode" href="#">Send to device</a>

            <div id="qrcode" class="hidden"></div>

        </li>

    [% END %]

[% IF ( Koha.Preference('OPACDetailQRCode') ) %]

    [% Asset.js("lib/kjua/kjua.min.js") | $raw %]

[% END %]

        [% IF ( Koha.Preference('OPACDetailQRCode') ) %]

            var qrcode = kjua({

                ecLevel: "H",

                render: "canvas",

                rounded: 100,

                size: 150,

                text: location.href,

            });

            if (qrcode) {

                document.getElementById("qrcode").appendChild( qrcode );

            }

            $(".show_qrcode").on("click", function(){

                var qrcodeImg = $("#qrcode");

                if( qrcodeImg.hasClass("hidden") ){

                    qrcodeImg.removeClass("hidden");

                } else {

                    qrcodeImg.addClass("hidden");

                }

            });

        [% END %]

const {create_canvas, canvas_to_img, dpr} = require('./lib/dom');

const defaults = require('./lib/defaults');

const qrcode = require('./lib/qrcode');

const draw = require('./lib/draw');

module.exports = options => {

    const settings = Object.assign({}, defaults, options);

    const qr = qrcode(settings.text, settings.ecLevel, settings.minVersion, settings.quiet);

    const ratio = settings.ratio || dpr;

    const canvas = create_canvas(settings.size, ratio);

    const context = canvas.getContext('2d');

    context.scale(ratio, ratio);

    draw(qr, context, settings);

    return settings.render === 'image' ? canvas_to_img(canvas) : canvas;

};

/*! kjua v0.6.0 - https://larsjung.de/kjua/ */

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e[t]},gexp:function(t){for(;t<0;)t+=255;for(;256<=t;)t-=255;return r[t]}};return n}();function m(n,o){if(void 0===n.length)throw n.length+"/"+o;var r=function(){for(var t=0;t<n.length&&0==n[t];)t+=1;for(var r=new Array(n.length-t+o),e=0;e<n.length-t;e+=1)r[e]=n[e+t];return r}(),i={getAt:function(t){return r[t]},getLength:function(){return r.length},multiply:function(t){for(var r=new Array(i.getLength()+t.getLength()-1),e=0;e<i.getLength();e+=1)for(var n=0;n<t.getLength();n+=1)r[e+n]^=p.gexp(p.glog(i.getAt(e))+p.glog(t.getAt(n)));return m(r,0)},mod:function(t){if(i.getLength()-t.getLength()<0)return i;for(var r=p.glog(i.getAt(0))-p.glog(t.getAt(0)),e=new Array(i.getLength()),n=0;n<i.getLength();n+=1)e[n]=i.getAt(n);for(n=0;n<t.getLength();n+=1)e[n]^=p.gexp(p.glog(t.getAt(n))+r);return m(e,0).mod(t)}};return i}function b(){var e=[],o={writeByte:function(t){e.push(255&t)},writeShort:function(t){o.writeByte(t),o.writeByte(t>>>8)},writeBytes:function(t,r,e){r=r||0,e=e||t.length;for(var n=0;n<e;n+=1)o.writeByte(t[n+r])},writeString:function(t){for(var r=0;r<t.length;r+=1)o.writeByte(t.charCodeAt(r))},toByteArray:function(){return e},toString:function(){var t="";t+="[";for(var r=0;r<e.length;r+=1)0<r&&(t+=","),t+=e[r];return t+="]"}};return o}var k,t,B=(k=[[1,26,19],[1,26,16],[1,26,13],[1,26,9],[1,44,34],[1,44,28],[1,44,22],[1,44,16],[1,70,55],[1,70,44],[2,35,17],[2,35,13],[1,100,80],[2,50,32],[2,50,24],[4,25,9],[1,134,108],[2,67,43],[2,33,15,2,34,16],[2,33,11,2,34,12],[2,86,68],[4,43,27],[4,43,19],[4,43,15],[2,98,78],[4,49,31],[2,32,14,4,33,15],[4,39,13,1,40,14],[2,121,97],[2,60,38,2,61,39],[4,40,18,2,41,19],[4,40,14,2,41,15],[2,146,116],[3,58,36,2,59,37],[4,36,16,4,37,17],[4,36,12,4,37,13],[2,86,68,2,87,69],[4,69,43,1,70,44],[6,43,19,2,44,20],[6,43,15,2,44,16],[4,101,81],[1,80,50,4,81,51],[4,50,22,4,51,23],[3,36,12,8,37,13],[2,116,92,2,117,93],[6,58,36,2,59,37],[4,46,20,6,47,21],[7,42,14,4,43,15],[4,133,107],[8,59,37,1,60,38],[8,44,20,4,45,21],[12,33,11,4,34,12],[3,145,115,1,146,116],[4,64,40,5,65,41],[11,36,16,5,37,17],[11,36,12,5,37,13],[5,109,87,1,110,88],[5,65,41,5,66,42],[5,54,24,7,55,25],[11,36,12,7,37,13],[5,122,98,1,123,99],[7,73,45,3,74,46],[15,43,19,2,44,20],[3,45,15,13,46,16],[1,135,107,5,136,108],[10,74,46,1,75,47],[1,50,22,15,51,23],[2,42,14,17,43,15],[5,150,120,1,151,121],[9,69,43,4,70,44],[17,50,22,1,51,23],[2,42,14,19,43,15],[3,141,113,4,142,114],[3,70,44,11,71,45],[17,47,21,4,48,22],[9,39,13,16,40,14],[3,135,107,5,136,108],[3,67,41,13,68,42],[15,54,24,5,55,25],[15,43,15,10,44,16],[4,144,116,4,145,117],[17,68,42],[17,50,22,6,51,23],[19,46,16,6,47,17],[2,139,111,7,140,112],[17,74,46],[7,54,24,16,55,25],[34,37,13],[4,151,121,5,152,122],[4,75,47,14,76,48],[11,54,24,14,55,25],[16,45,15,14,46,16],[6,147,117,4,148,118],[6,73,45,14,74,46],[11,54,24,16,55,25],[30,46,16,2,47,17],[8,132,106,4,133,107],[8,75,47,13,76,48],[7,54,24,22,55,25],[22,45,15,13,46,16],[10,142,114,2,143,115],[19,74,46,4,75,47],[28,50,22,6,51,23],[33,46,16,4,47,17],[8,152,122,4,153,123],[22,73,45,3,74,46],[8,53,23,26,54,24],[12,45,15,28,46,16],[3,147,117,10,148,118],[3,73,45,23,74,46],[4,54,24,31,55,25],[11,45,15,31,46,16],[7,146,116,7,147,117],[21,73,45,7,74,46],[1,53,23,37,54,24],[19,45,15,26,46,16],[5,145,115,10,146,116],[19,75,47,10,76,48],[15,54,24,25,55,25],[23,45,15,25,46,16],[13,145,115,3,146,116],[2,74,46,29,75,47],[42,54,24,1,55,25],[23,45,15,28,46,16],[17,145,115],[10,74,46,23,75,47],[10,54,24,35,55,25],[19,45,15,35,46,16],[17,145,115,1,146,116],[14,74,46,21,75,47],[29,54,24,19,55,25],[11,45,15,46,46,16],[13,145,115,6,146,116],[14,74,46,23,75,47],[44,54,24,7,55,25],[59,46,16,1,47,17],[12,151,121,7,152,122],[12,75,47,26,76,48],[39,54,24,14,55,25],[22,45,15,41,46,16],[6,151,121,14,152,122],[6,75,47,34,76,48],[46,54,24,10,55,25],[2,45,15,64,46,16],[17,152,122,4,153,123],[29,74,46,14,75,47],[49,54,24,10,55,25],[24,45,15,46,46,16],[4,152,122,18,153,123],[13,74,46,32,75,47],[48,54,24,14,55,25],[42,45,15,32,46,16],[20,147,117,4,148,118],[40,75,47,7,76,48],[43,54,24,22,55,25],[10,45,15,67,46,16],[19,148,118,6,149,119],[18,75,47,31,76,48],[34,54,24,34,55,25],[20,45,15,61,46,16]],(t={}).getRSBlocks=function(t,r){var e=function(t,r){switch(r){case y.L:return k[4*(t-1)+0];case y.M:return k[4*(t-1)+1];case y.Q:return k[4*(t-1)+2];case y.H:return k[4*(t-1)+3];default:return}}(t,r);if(void 0===e)throw"bad rs block @ typeNumber:"+t+"/errorCorrectionLevel:"+r;for(var n,o,i=e.length/3,a=[],u=0;u<i;u+=1)for(var f=e[3*u+0],c=e[3*u+1],l=e[3*u+2],s=0;s<f;s+=1)a.push((n=l,o=void 0,(o={}).totalCount=c,o.dataCount=n,o));return a},t),C=function(){var e=[],n=0,o={getBuffer:function(){return e},getAt:function(t){var r=Math.floor(t/8);return 1==(e[r]>>>7-t%8&1)},put:function(t,r){for(var e=0;e<r;e+=1)o.putBit(1==(t>>>r-e-1&1))},getLengthInBits:function(){return n},putBit:function(t){var r=Math.floor(n/8);e.length<=r&&e.push(0),t&&(e[r]|=128>>>n%8),n+=1}};return o},x=function(t){var r=a,n=t,e={getMode:function(){return r},getLength:function(t){return n.length},write:function(t){for(var r=n,e=0;e+2<r.length;)t.put(o(r.substring(e,e+3)),10),e+=3;e<r.length&&(r.length-e==1?t.put(o(r.substring(e,e+1)),4):r.length-e==2&&t.put(o(r.substring(e,e+2)),7))}},o=function(t){for(var r=0,e=0;e<t.length;e+=1)r=10*r+i(t.charAt(e));return r},i=function(t){if("0"<=t&&t<="9")return t.charCodeAt(0)-"0".charCodeAt(0);throw"illegal char :"+t};return e},A=function(t){var r=u,n=t,e={getMode:function(){return r},getLength:function(t){return n.length},write:function(t){for(var r=n,e=0;e+1<r.length;)t.put(45*o(r.charAt(e))+o(r.charAt(e+1)),11),e+=2;e<r.length&&t.put(o(r.charAt(e)),6)}},o=function(t){if("0"<=t&&t<="9")return t.charCodeAt(0)-"0".charCodeAt(0);if("A"<=t&&t<="Z")return t.charCodeAt(0)-"A".charCodeAt(0)+10;switch(t){case" ":return 36;case"$":return 37;case"%":return 38;case"*":return 39;case"+":return 40;case"-":return 41;case".":return 42;case"/":return 43;case":":return 44;default:throw"illegal char :"+t}};return e},M=function(t){var r=o,e=i.stringToBytes(t),n={getMode:function(){return r},getLength:function(t){return e.length},write:function(t){for(var r=0;r<e.length;r+=1)t.put(e[r],8)}};return n},S=function(t){var r=f,n=i.stringToBytesFuncs.SJIS;if(!n)throw"sjis not supported.";!function(t,r){var e=n("友");if(2!=e.length||38726!=(e[0]<<8|e[1]))throw"sjis not supported."}();var o=n(t),e={getMode:function(){return r},getLength:function(t){return~~(o.length/2)},write:function(t){for(var r=o,e=0;e+1<r.length;){var n=(255&r[e])<<8|255&r[e+1];if(33088<=n&&n<=40956)n-=33088;else{if(!(57408<=n&&n<=60351))throw"illegal char at "+(e+1)+"/"+n;n-=49472}n=192*(n>>>8&255)+(255&n),t.put(n,13),e+=2}if(e<r.length)throw"illegal char at "+(e+1)}};return e},L=function(t){var e=t,n=0,o=0,i=0,r={read:function(){for(;i<8;){if(n>=e.length){if(0==i)return-1;throw"unexpected end of file./"+i}var t=e.charAt(n);if(n+=1,"="==t)return i=0,-1;t.match(/^\s$/)||(o=o<<6|a(t.charCodeAt(0)),i+=6)}var r=o>>>i-8&255;return i-=8,r}},a=function(t){if(65<=t&&t<=90)return t-65;if(97<=t&&t<=122)return t-97+26;if(48<=t&&t<=57)return t-48+52;if(43==t)return 62;if(47==t)return 63;throw"c:"+t};return r},D=function(t,r,e){for(var n=function(t,r){var n=t,o=r,s=new Array(t*r),e={setPixel:function(t,r,e){s[r*n+t]=e},write:function(t){t.writeString("GIF87a"),t.writeShort(n),t.writeShort(o),t.writeByte(128),t.writeByte(0),t.writeByte(0),t.writeByte(0),t.writeByte(0),t.writeByte(0),t.writeByte(255),t.writeByte(255),t.writeByte(255),t.writeString(","),t.writeShort(0),t.writeShort(0),t.writeShort(n),t.writeShort(o),t.writeByte(0);var r=i(2);t.writeByte(2);for(var e=0;255<r.length-e;)t.writeByte(255),t.writeBytes(r,e,255),e+=255;t.writeByte(r.length-e),t.writeBytes(r,e,r.length-e),t.writeByte(0),t.writeString(";")}},i=function(t){for(var r=1<<t,e=1+(1<<t),n=t+1,o=g(),i=0;i<r;i+=1)o.add(String.fromCharCode(i));o.add(String.fromCharCode(r)),o.add(String.fromCharCode(e));var a=b(),u=function(t){var e=t,n=0,o=0,r={write:function(t,r){if(t>>>r!=0)throw"length over";for(;8<=n+r;)e.writeByte(255&(t<<n|o)),r-=8-n,t>>>=8-n,n=o=0;o|=t<<n,n+=r},flush:function(){0<n&&e.writeByte(o)}};return r}(a);u.write(r,n);var f=0,c=String.fromCharCode(s[f]);for(f+=1;f<s.length;){var l=String.fromCharCode(s[f]);f+=1,o.contains(c+l)?c+=l:(u.write(o.indexOf(c),n),o.size()<4095&&(o.size()==1<<n&&(n+=1),o.add(c+l)),c=l)}return u.write(o.indexOf(c),n),u.write(e,n),u.flush(),a.toByteArray()},g=function(){var r={},e=0,n={add:function(t){if(n.contains(t))throw"dup key:"+t;r[t]=e,e+=1},size:function(){return e},indexOf:function(t){return r[t]},contains:function(t){return void 0!==r[t]}};return n};return e}(t,r),o=0;o<r;o+=1)for(var i=0;i<t;i+=1)n.setPixel(i,o,e(i,o));var a=b();n.write(a);for(var u=function(){function e(t){a+=String.fromCharCode(r(63&t))}var n=0,o=0,i=0,a="",t={},r=function(t){if(t<0);else{if(t<26)return 65+t;if(t<52)return t-26+97;if(t<62)return t-52+48;if(62==t)return 43;if(63==t)return 47}throw"n:"+t};return t.writeByte=function(t){for(n=n<<8|255&t,o+=8,i+=1;6<=o;)e(n>>>o-6),o-=6},t.flush=function(){if(0<o&&(e(n<<6-o),o=n=0),i%3!=0)for(var t=3-i%3,r=0;r<t;r+=1)a+="="},t.toString=function(){return a},t}(),f=a.toByteArray(),c=0;c<f.length;c+=1)u.writeByte(f[c]);return u.flush(),"data:image/gif;base64,"+u};return i}();a.stringToBytesFuncs["UTF-8"]=function(t){return function(t){for(var r=[],e=0;e<t.length;e++){var n=t.charCodeAt(e);n<128?r.push(n):n<2048?r.push(192|n>>6,128|63&n):n<55296||57344<=n?r.push(224|n>>12,128|n>>6&63,128|63&n):(e++,n=65536+((1023&n)<<10|1023&t.charCodeAt(e)),r.push(240|n>>18,128|n>>12&63,128|n>>6&63,128|63&n))}return r}(t)},o=[],void 0===(i="function"==typeof(n=function(){return a})?n.apply(r,o):n)||(t.exports=i)},function(t,r,e){function c(t,r,e,n,o,i){t.isDark(o,i)&&r.rect(i*n,o*n,n,n)}var l=e(7),n=e(8);t.exports=function(t,r,e){!function(t,r){t.fillStyle=r.back,t.fillRect(0,0,r.size,r.size)}(r,e),function(t,r,e){if(t){var n=0<e.rounded&&e.rounded<=100?l:c,o=t.moduleCount,i=e.size/o,a=0;e.crisp&&(i=Math.floor(i),a=Math.floor((e.size-i*o)/2)),r.translate(a,a),r.beginPath();for(var u=0;u<o;u+=1)for(var f=0;f<o;f+=1)n(t,r,e,i,u,f);r.fillStyle=e.fill,r.fill(),r.translate(-a,-a)}}(t,r,e),n(r,e)}},function(t,r){t.exports=function(t,r,e,n,o,i){var a=i*n,u=o*n,f=a+n,c=u+n,l=.005*e.rounded*n,s=t.isDark,g=o-1,h=o+1,v=i-1,d=i+1,p=s(o,i),y=s(g,v),w=s(g,i),m=s(g,d),b=s(o,d),k=s(h,d),B=s(h,i),C=s(h,v),x=s(o,v);r=function(t){return{c:t,m:function(){var t;return(t=this.c).moveTo.apply(t,arguments),this},l:function(){var t;return(t=this.c).lineTo.apply(t,arguments),this},a:function(){var t;return(t=this.c).arcTo.apply(t,arguments),this}}}(r),p?function(t,r,e,n,o,i,a,u,f,c){a?t.m(r+i,e):t.m(r,e),u?t.l(n-i,e).a(n,e,n,o,i):t.l(n,e),f?t.l(n,o-i).a(n,o,r,o,i):t.l(n,o),c?t.l(r+i,o).a(r,o,r,e,i):t.l(r,o),a?t.l(r,e+i).a(r,e,n,e,i):t.l(r,e)}(r,a,u,f,c,l,!w&&!x,!w&&!b,!B&&!b,!B&&!x):function(t,r,e,n,o,i,a,u,f,c){a&&t.m(r+i,e).l(r,e).l(r,e+i).a(r,e,r+i,e,i),u&&t.m(n-i,e).l(n,e).l(n,e+i).a(n,e,n-i,e,i),f&&t.m(n-i,o).l(n,o).l(n,o-i).a(n,o,n-i,o,i),c&&t.m(r+i,o).l(r,o).l(r,o-i).a(r,o,r+i,o,i)}(r,a,u,f,c,l,w&&x&&y,w&&b&&m,B&&b&&k,B&&x&&C)}},function(t,r){t.exports=function(t,r){var e=r.mode;"label"===e?function(t,r){var e=r.size,n="bold "+.01*r.mSize*e+"px "+r.fontname;t.strokeStyle=r.back,t.lineWidth=.01*r.mSize*e*.1,t.fillStyle=r.fontcolor,t.font=n;var o=t.measureText(r.label).width,i=.01*r.mSize,a=(1-o/e)*r.mPosX*.01*e,u=(1-i)*r.mPosY*.01*e+.75*r.mSize*.01*e;t.strokeText(r.label,a,u),t.fillText(r.label,a,u)}(t,r):"image"===e&&function(t,r){var e=r.size,n=r.image.naturalWidth||1,o=r.image.naturalHeight||1,i=.01*r.mSize,a=i*n/o,u=(1-a)*r.mPosX*.01*e,f=(1-i)*r.mPosY*.01*e,c=a*e,l=i*e;t.drawImage(r.image,u,f,c,l)}(t,r)}}])});

module.exports = {

    // render method: 'canvas' or 'image'

    render: 'image',

    // render pixel-perfect lines

    crisp: true,

    // minimum version: 1..40

    minVersion: 1,

    // error correction level: 'L', 'M', 'Q' or 'H'

    ecLevel: 'L',

    // size in pixel

    size: 200,

    // pixel-ratio, null for devicePixelRatio

    ratio: null,

    // code color

    fill: '#333',

    // background color

    back: '#fff',

    // content

    text: 'no text',

    // roundend corners in pc: 0..100

    rounded: 0,

    // quiet zone in modules

    quiet: 0,

    // modes: 'plain', 'label' or 'image'

    mode: 'plain',

    // label/image size and pos in pc: 0..100

    mSize: 30,

    mPosX: 50,

    mPosY: 50,

    // label

    label: 'no label',

    fontname: 'sans',

    fontcolor: '#333',

    // image element

    image: null

};

const win = global.window;

const doc = win.document;

const dpr = win.devicePixelRatio || 1;

const create = name => doc.createElement(name);

const get_attr = (el, key) => el.getAttribute(key);

const set_attr = (el, key, value) => el.setAttribute(key, value);

const create_canvas = (size, ratio) => {

    const canvas = create('canvas');

    set_attr(canvas, 'width', size * ratio);

    set_attr(canvas, 'height', size * ratio);

    canvas.style.width = `${size}px`;

    canvas.style.height = `${size}px`;

    return canvas;

};

const canvas_to_img = canvas => {

    const img = create('img');

    set_attr(img, 'crossorigin', 'anonymous');

    set_attr(img, 'src', canvas.toDataURL('image/png'));

    set_attr(img, 'width', get_attr(canvas, 'width'));

    set_attr(img, 'height', get_attr(canvas, 'height'));

    img.style.width = canvas.style.width;

    img.style.height = canvas.style.height;

    return img;

};

module.exports = {

    create_canvas,

    canvas_to_img,

    dpr

};

const draw_module_rounded = require('./draw_rounded');

const draw_mode = require('./draw_mode');

const draw_background = (ctx, settings) => {

    ctx.fillStyle = settings.back;

    ctx.fillRect(0, 0, settings.size, settings.size);

};

const draw_module_default = (qr, ctx, settings, width, row, col) => {

    if (qr.isDark(row, col)) {

        ctx.rect(col * width, row * width, width, width);

    }

};

const draw_modules = (qr, ctx, settings) => {

    if (!qr) {

        return;

    }

    const draw_module = settings.rounded > 0 && settings.rounded <= 100 ? draw_module_rounded : draw_module_default;

    const mod_count = qr.moduleCount;

    let mod_size = settings.size / mod_count;

    let offset = 0;

    if (settings.crisp) {

        mod_size = Math.floor(mod_size);

        offset = Math.floor((settings.size - mod_size * mod_count) / 2);

    }

    ctx.translate(offset, offset);

    ctx.beginPath();

    for (let row = 0; row < mod_count; row += 1) {

        for (let col = 0; col < mod_count; col += 1) {

            draw_module(qr, ctx, settings, mod_size, row, col);

        }

    }

    ctx.fillStyle = settings.fill;

    ctx.fill();

    ctx.translate(-offset, -offset);

};

const draw = (qr, ctx, settings) => {

    draw_background(ctx, settings);

    draw_modules(qr, ctx, settings);

    draw_mode(ctx, settings);

};

module.exports = draw;

const draw_label = (ctx, settings) => {

    const size = settings.size;

    const font = 'bold ' + settings.mSize * 0.01 * size + 'px ' + settings.fontname;

    ctx.strokeStyle = settings.back;

    ctx.lineWidth = settings.mSize * 0.01 * size * 0.1;

    ctx.fillStyle = settings.fontcolor;

    ctx.font = font;

    const w = ctx.measureText(settings.label).width;

    const sh = settings.mSize * 0.01;

    const sw = w / size;

    const sl = (1 - sw) * settings.mPosX * 0.01;

    const st = (1 - sh) * settings.mPosY * 0.01;

    const x = sl * size;

    const y = st * size + 0.75 * settings.mSize * 0.01 * size;

    ctx.strokeText(settings.label, x, y);

    ctx.fillText(settings.label, x, y);

};

const draw_image = (ctx, settings) => {

    const size = settings.size;

    const w = settings.image.naturalWidth || 1;

    const h = settings.image.naturalHeight || 1;

    const sh = settings.mSize * 0.01;

    const sw = sh * w / h;

    const sl = (1 - sw) * settings.mPosX * 0.01;

    const st = (1 - sh) * settings.mPosY * 0.01;

    const x = sl * size;

    const y = st * size;

    const iw = sw * size;

    const ih = sh * size;

    ctx.drawImage(settings.image, x, y, iw, ih);

};

const draw_mode = (ctx, settings) => {

    const mode = settings.mode;

    if (mode === 'label') {

        draw_label(ctx, settings);

    } else if (mode === 'image') {

        draw_image(ctx, settings);

    }

};

module.exports = draw_mode;

const wrap_ctx = ctx => {

    return {

        c: ctx,

        m(...args) {this.c.moveTo(...args); return this;},

        l(...args) {this.c.lineTo(...args); return this;},

        a(...args) {this.c.arcTo(...args); return this;}

    };

};

const draw_dark = (ctx, l, t, r, b, rad, nw, ne, se, sw) => {

    if (nw) {

        ctx.m(l + rad, t);

    } else {

        ctx.m(l, t);

    }

    if (ne) {

        ctx.l(r - rad, t).a(r, t, r, b, rad);

    } else {

        ctx.l(r, t);

    }

    if (se) {

        ctx.l(r, b - rad).a(r, b, l, b, rad);

    } else {

        ctx.l(r, b);

    }

    if (sw) {

        ctx.l(l + rad, b).a(l, b, l, t, rad);

    } else {

        ctx.l(l, b);

    }

    if (nw) {

        ctx.l(l, t + rad).a(l, t, r, t, rad);

    } else {

        ctx.l(l, t);

    }

};

const draw_light = (ctx, l, t, r, b, rad, nw, ne, se, sw) => {

    if (nw) {

        ctx.m(l + rad, t).l(l, t).l(l, t + rad).a(l, t, l + rad, t, rad);

    }

    if (ne) {

        ctx.m(r - rad, t).l(r, t).l(r, t + rad).a(r, t, r - rad, t, rad);

    }

    if (se) {

        ctx.m(r - rad, b).l(r, b).l(r, b - rad).a(r, b, r - rad, b, rad);

    }

    if (sw) {

        ctx.m(l + rad, b).l(l, b).l(l, b - rad).a(l, b, l + rad, b, rad);

    }

};

const draw_mod = (qr, ctx, settings, width, row, col) => {

    const left = col * width;

    const top = row * width;

    const right = left + width;

    const bottom = top + width;

    const radius = settings.rounded * 0.005 * width;

    const isDark = qr.isDark;

    const rowT = row - 1;

    const rowB = row + 1;

    const colL = col - 1;

    const colR = col + 1;

    const dC = isDark(row, col);

    const dNW = isDark(rowT, colL);

    const dN = isDark(rowT, col);

    const dNE = isDark(rowT, colR);

    const dE = isDark(row, colR);

    const dSE = isDark(rowB, colR);

    const dS = isDark(rowB, col);

    const dSW = isDark(rowB, colL);

    const dW = isDark(row, colL);

    ctx = wrap_ctx(ctx);

    if (dC) {

        draw_dark(ctx, left, top, right, bottom, radius, !dN && !dW, !dN && !dE, !dS && !dE, !dS && !dW);

    } else {

        draw_light(ctx, left, top, right, bottom, radius, dN && dW && dNW, dN && dE && dNE, dS && dE && dSE, dS && dW && dSW);

    }

};

module.exports = draw_mod;