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render.js
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render.js
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/*
* svgexport
* Copyright (c) 2016 Ali Shakiba
* Available under the MIT license
* @license
*/
var puppeteer = require("puppeteer");
var async = require('async');
var path = require('path');
var resize = require('./resize');
module.exports.renderSvg = renderSvg;
async function renderSvg(commands, done, stdout) {
// Make sure the commands var is an array.
commands = Array.isArray(commands) ? commands : [ commands ];
var browser = await puppeteer.launch({
headless: true,
args: ['--no-sandbox', '--font-render-hinting=none']
});
// Run each command in parallel.
await async.each(commands, async function(cmd) {
var page = await browser.newPage();
if (process.env.SVGEXPORT_TIMEOUT) {
await page.setDefaultNavigationTimeout(Number(process.env.SVGEXPORT_TIMEOUT) * 1000);
}
var svgfile = cmd.input[0].split(path.sep)
.map((pathPart) => encodeURI(pathPart))
.join(path.sep);
var imgfile = cmd.output[0];
var params = [].concat(cmd.input.slice(1), cmd.output.slice(1));
await page.goto('file://' + svgfile)
.catch(function(e) {
throw 'Unable to load file (' + e + '): ' + svgfile;
}
);
var input = await page.evaluate(function() {
var el = document.documentElement;
var widthAttr = el.getAttribute('width');
var heightAttr = el.getAttribute('height');
var viewBoxAttr = el.getAttribute('viewBox');
if (widthAttr && heightAttr && !/\%\s*$/.test(widthAttr)
&& !/\%\s*$/.test(heightAttr)) {
return {
size : true,
left : 0,
top : 0,
width : el.width.animVal.value,
height : el.height.animVal.value
};
} else if (viewBoxAttr && el.viewBox) {
return {
viewbox : true,
left : el.viewBox.animVal.x,
top : el.viewBox.animVal.y,
width : el.viewBox.animVal.width,
height : el.viewBox.animVal.height
};
} else {
var box = el.getBBox();
return {
bbox : true,
left : box.x,
top : box.y,
width : box.width,
height : box.height
};
}
});
var output = new Command(input, params, imgfile);
if (output.css) {
await injectCSS(page, output.css);
}
var clip = {
x: output.left - input.left * output.scale,
y: output.top - input.top * output.scale
};
await page.evaluate(function(input, output, clip) {
var svg = document.getElementsByTagName('svg')[0];
if (!input.viewbox && !svg.getAttribute('viewBox')) {
svg.setAttribute('viewBox', '0 0 ' + input.width + ' ' + input.height);
svg.setAttribute('preserveAspectRatio', 'xMidYMid meet');
}
svg.removeAttribute('width');
svg.removeAttribute('height');
svg.style.setProperty('margin', 0, 'important');
svg.style.setProperty('border', 0, 'important');
svg.style.setProperty('padding', 0, 'important');
svg.style.setProperty('position', 'fixed', 'important');
if (clip.x < 0) {
svg.style.setProperty('left', Math.abs(clip.x) + 'px', 'important');
} else {
svg.style.setProperty('left', 0, 'important');
}
if (clip.y < 0) {
svg.style.setProperty('top', Math.abs(clip.y) + 'px', 'important');
} else {
svg.style.setProperty('top', 0, 'important');
}
svg.style.setProperty('width', (input.width * output.scale) + 'px', 'important');
svg.style.setProperty('height', (input.height * output.scale) + 'px', 'important');
}, input, output, clip);
var svgContent = await page.content();
clip.x = Math.max(clip.x, 0);
clip.y = Math.max(clip.y, 0);
var renderContent = `
<!DOCTYPE html>
<html>
<head>
<title>svg</title>
</head>
<body
style="
margin: 0 !important;
border: 0 !important;
padding: 0 !important;
">
<div id="svgExportOutput-fa5ce2b6d16510"
style="
margin: 0 !important;
border: 0 !important;
padding: 0 !important;
position: fixed !important;
left: ${clip.x}px !important;
top: ${clip.y}px !important;
width: ${output.width}px !important;
height: ${output.height}px !important;
"
></div>
${svgContent}
</body>
</html>
`;
await page.goto('about:blank');
await page.setContent(renderContent);
var renderSettings = {
path: imgfile,
type: output.format,
omitBackground: true
};
if (output.format === 'jpeg') {
renderSettings.quality = output.quality;
}
var outputEl = await page.$('#svgExportOutput-fa5ce2b6d16510');
await outputEl.screenshot(renderSettings);
stdout(svgfile + ' ' + imgfile + ' ' + output.toString() + '\n');
}, async function(err) {
await browser.close();
done(err ? String(err) + '\n': undefined);
});
}
async function injectCSS(page, css) {
await page.evaluate(function(css) {
var ns = "http://www.w3.org/2000/svg";
var style = document.createElementNS(ns, "style");
style.setAttribute('type', 'text/css');
style.appendChild(document.createCDATASection(css));
var svg = document.documentElement;
svg.insertBefore(style, svg.firstChild);
}, css);
}
function Command(input, params, outputfile) {
params = new Params(params);
var output = this;
output.scale = 1;
output.format = 'png';
output.quality = 100;
output.mode = 'crop'; // slice
params.first(/^(\d+)\%$/i, function(match) {
output.quality = parseInt(match[1]);
});
params.first(/^(jpeg|jpg)$/i, function(match) {
output.format = match[1];
}, function() {
if (outputfile) {
var ext = /.(jpeg|jpg)$/.exec(outputfile);
if (ext && ext[1]) {
output.format = ext[1];
}
}
});
output.format = output.format.toLowerCase().replace('jpg', 'jpeg');
// output
params.last(/^([0-9.]+)x$/i, function(match) {
// <scale>x
output.scale = parseFloat(match[1]);
}) || params.last(/^(\d+):$/i, function(match) {
// <width>:
output.width = parseInt(match[1]);
}) || params.last(/^:(\d+)$/i, function(match) {
// :<height>
output.height = parseInt(match[1]);
}) || params.last(/^(\d+):(\d+)$/i, function(match) {
// <width>:<height>
output.width = parseInt(match[1]);
output.height = parseInt(match[2]);
});
// input
params.last(/^((-?\d+):(-?\d+):)?(\d+):(\d+)$/i, function(match) {
input = {
left : parseInt(match[2]) || 0,
top : parseInt(match[3]) || 0,
width : parseInt(match[4]),
height : parseInt(match[5])
};
});
// crop mode
params.first(/^(pad|meet)$/i, function(match) {
output.mode = 'pad';
});
// css style
params.first(/^([^{}]+\s*\{[^{}]*\}\s*)+$/i, function(match) {
output.css = match[0];
});
var resized = resize(input, output);
this.scale = resized.scale;
this.width = resized.width;
this.height = resized.height;
this.left = resized.left;
this.top = resized.top;
}
Command.prototype.toString = function() {
return this.format + ' ' + this.quality + '%' + ' ' + this.scale + 'x' + ' '
+ strnum(this.left / this.scale) + ':' + strnum(this.top / this.scale)
+ ':' + strnum(this.width / this.scale) + ':'
+ strnum(this.height / this.scale) + ' ' + strnum(this.width) + ':'
+ strnum(this.height);
}
function Params(params) {
this.first = function(regex, callback, fallback) {
for (var i = 0; i < params.length; i++) {
var param = params[i];
var match = regex.exec(param);
if (match) {
params.splice(i--, 1);
callback(match);
return true;
}
}
fallback && fallback();
return false;
};
this.last = function(regex, callback, fallback) {
for (var i = params.length - 1; i >= 0; i--) {
var param = params[i];
var match = regex.exec(param);
if (match) {
params.splice(i, 1);
callback(match);
return true;
}
}
fallback && fallback();
return false;
};
}
function strnum(n) {
return (n * 100 | 0) / 100;
}