save-svg-as-png
Version:
Convert a browser SVG to PNG or dataUri
445 lines (399 loc) • 17 kB
JavaScript
;
(function () {
var out$ = typeof exports != 'undefined' && exports || typeof define != 'undefined' && {} || this || window;
if (typeof define !== 'undefined') define('save-svg-as-png', [], function () {
return out$;
});
out$.default = out$;
var xmlNs = 'http://www.w3.org/2000/xmlns/';
var xhtmlNs = 'http://www.w3.org/1999/xhtml';
var svgNs = 'http://www.w3.org/2000/svg';
var doctype = '<?xml version="1.0" standalone="no"?><!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd" [<!ENTITY nbsp " ">]>';
var urlRegex = /url\(["']?(.+?)["']?\)/;
var fontFormats = {
woff2: 'font/woff2',
woff: 'font/woff',
otf: 'application/x-font-opentype',
ttf: 'application/x-font-ttf',
eot: 'application/vnd.ms-fontobject',
sfnt: 'application/font-sfnt',
svg: 'image/svg+xml'
};
var isElement = function isElement(obj) {
return obj instanceof HTMLElement || obj instanceof SVGElement;
};
var requireDomNode = function requireDomNode(el) {
if (!isElement(el)) throw new Error('an HTMLElement or SVGElement is required; got ' + el);
};
var requireDomNodePromise = function requireDomNodePromise(el) {
return new Promise(function (resolve, reject) {
if (isElement(el)) resolve(el);else reject(new Error('an HTMLElement or SVGElement is required; got ' + el));
});
};
var isExternal = function isExternal(url) {
return url && url.lastIndexOf('http', 0) === 0 && url.lastIndexOf(window.location.host) === -1;
};
var getFontMimeTypeFromUrl = function getFontMimeTypeFromUrl(fontUrl) {
var formats = Object.keys(fontFormats).filter(function (extension) {
return fontUrl.indexOf('.' + extension) > 0;
}).map(function (extension) {
return fontFormats[extension];
});
if (formats) return formats[0];
console.error('Unknown font format for ' + fontUrl + '. Fonts may not be working correctly.');
return 'application/octet-stream';
};
var arrayBufferToBase64 = function arrayBufferToBase64(buffer) {
var binary = '';
var bytes = new Uint8Array(buffer);
for (var i = 0; i < bytes.byteLength; i++) {
binary += String.fromCharCode(bytes[i]);
}return window.btoa(binary);
};
var getDimension = function getDimension(el, clone, dim) {
var v = el.viewBox && el.viewBox.baseVal && el.viewBox.baseVal[dim] || clone.getAttribute(dim) !== null && !clone.getAttribute(dim).match(/%$/) && parseInt(clone.getAttribute(dim)) || el.getBoundingClientRect()[dim] || parseInt(clone.style[dim]) || parseInt(window.getComputedStyle(el).getPropertyValue(dim));
return typeof v === 'undefined' || v === null || isNaN(parseFloat(v)) ? 0 : v;
};
var getDimensions = function getDimensions(el, clone, width, height) {
if (el.tagName === 'svg') return {
width: width || getDimension(el, clone, 'width'),
height: height || getDimension(el, clone, 'height')
};else if (el.getBBox) {
var _el$getBBox = el.getBBox(),
x = _el$getBBox.x,
y = _el$getBBox.y,
_width = _el$getBBox.width,
_height = _el$getBBox.height;
return {
width: x + _width,
height: y + _height
};
}
};
var reEncode = function reEncode(data) {
return decodeURIComponent(encodeURIComponent(data).replace(/%([0-9A-F]{2})/g, function (match, p1) {
var c = String.fromCharCode('0x' + p1);
return c === '%' ? '%25' : c;
}));
};
var uriToBlob = function uriToBlob(uri) {
var byteString = window.atob(uri.split(',')[1]);
var mimeString = uri.split(',')[0].split(':')[1].split(';')[0];
var buffer = new ArrayBuffer(byteString.length);
var intArray = new Uint8Array(buffer);
for (var i = 0; i < byteString.length; i++) {
intArray[i] = byteString.charCodeAt(i);
}
return new Blob([buffer], { type: mimeString });
};
var query = function query(el, selector) {
if (!selector) return;
try {
return el.querySelector(selector) || el.parentNode && el.parentNode.querySelector(selector);
} catch (err) {
console.warn('Invalid CSS selector "' + selector + '"', err);
}
};
var detectCssFont = function detectCssFont(rule, href) {
// Match CSS font-face rules to external links.
// @font-face {
// src: local('Abel'), url(https://fonts.gstatic.com/s/abel/v6/UzN-iejR1VoXU2Oc-7LsbvesZW2xOQ-xsNqO47m55DA.woff2);
// }
var match = rule.cssText.match(urlRegex);
var url = match && match[1] || '';
if (!url || url.match(/^data:/) || url === 'about:blank') return;
var fullUrl = url.startsWith('../') ? href + '/../' + url : url.startsWith('./') ? href + '/.' + url : url;
return {
text: rule.cssText,
format: getFontMimeTypeFromUrl(fullUrl),
url: fullUrl
};
};
var inlineImages = function inlineImages(el) {
return Promise.all(Array.from(el.querySelectorAll('image')).map(function (image) {
var href = image.getAttributeNS('http://www.w3.org/1999/xlink', 'href') || image.getAttribute('href');
if (!href) return Promise.resolve(null);
if (isExternal(href)) {
href += (href.indexOf('?') === -1 ? '?' : '&') + 't=' + new Date().valueOf();
}
return new Promise(function (resolve, reject) {
var canvas = document.createElement('canvas');
var img = new Image();
img.crossOrigin = 'anonymous';
img.src = href;
img.onerror = function () {
return reject(new Error('Could not load ' + href));
};
img.onload = function () {
canvas.width = img.width;
canvas.height = img.height;
canvas.getContext('2d').drawImage(img, 0, 0);
image.setAttributeNS('http://www.w3.org/1999/xlink', 'href', canvas.toDataURL('image/png'));
resolve(true);
};
});
}));
};
var cachedFonts = {};
var inlineFonts = function inlineFonts(fonts) {
return Promise.all(fonts.map(function (font) {
return new Promise(function (resolve, reject) {
if (cachedFonts[font.url]) return resolve(cachedFonts[font.url]);
var req = new XMLHttpRequest();
req.addEventListener('load', function () {
// TODO: it may also be worth it to wait until fonts are fully loaded before
// attempting to rasterize them. (e.g. use https://developer.mozilla.org/en-US/docs/Web/API/FontFaceSet)
var fontInBase64 = arrayBufferToBase64(req.response);
var fontUri = font.text.replace(urlRegex, 'url("data:' + font.format + ';base64,' + fontInBase64 + '")') + '\n';
cachedFonts[font.url] = fontUri;
resolve(fontUri);
});
req.addEventListener('error', function (e) {
console.warn('Failed to load font from: ' + font.url, e);
cachedFonts[font.url] = null;
resolve(null);
});
req.addEventListener('abort', function (e) {
console.warn('Aborted loading font from: ' + font.url, e);
resolve(null);
});
req.open('GET', font.url);
req.responseType = 'arraybuffer';
req.send();
});
})).then(function (fontCss) {
return fontCss.filter(function (x) {
return x;
}).join('');
});
};
var cachedRules = null;
var styleSheetRules = function styleSheetRules() {
if (cachedRules) return cachedRules;
return cachedRules = Array.from(document.styleSheets).map(function (sheet) {
try {
return { rules: sheet.cssRules, href: sheet.href };
} catch (e) {
console.warn('Stylesheet could not be loaded: ' + sheet.href, e);
return {};
}
});
};
var inlineCss = function inlineCss(el, options) {
var _ref = options || {},
selectorRemap = _ref.selectorRemap,
modifyStyle = _ref.modifyStyle,
modifyCss = _ref.modifyCss,
fonts = _ref.fonts,
excludeUnusedCss = _ref.excludeUnusedCss;
var generateCss = modifyCss || function (selector, properties) {
var sel = selectorRemap ? selectorRemap(selector) : selector;
var props = modifyStyle ? modifyStyle(properties) : properties;
return sel + '{' + props + '}\n';
};
var css = [];
var detectFonts = typeof fonts === 'undefined';
var fontList = fonts || [];
styleSheetRules().forEach(function (_ref2) {
var rules = _ref2.rules,
href = _ref2.href;
if (!rules) return;
Array.from(rules).forEach(function (rule) {
if (typeof rule.style != 'undefined') {
if (query(el, rule.selectorText)) css.push(generateCss(rule.selectorText, rule.style.cssText));else if (detectFonts && rule.cssText.match(/^@font-face/)) {
var font = detectCssFont(rule, href);
if (font) fontList.push(font);
} else if (!excludeUnusedCss) {
css.push(rule.cssText);
}
}
});
});
return inlineFonts(fontList).then(function (fontCss) {
return css.join('\n') + fontCss;
});
};
var downloadOptions = function downloadOptions() {
if (!navigator.msSaveOrOpenBlob && !('download' in document.createElement('a'))) {
return { popup: window.open() };
}
};
out$.prepareSvg = function (el, options, done) {
requireDomNode(el);
var _ref3 = options || {},
_ref3$left = _ref3.left,
left = _ref3$left === undefined ? 0 : _ref3$left,
_ref3$top = _ref3.top,
top = _ref3$top === undefined ? 0 : _ref3$top,
w = _ref3.width,
h = _ref3.height,
_ref3$scale = _ref3.scale,
scale = _ref3$scale === undefined ? 1 : _ref3$scale,
_ref3$responsive = _ref3.responsive,
responsive = _ref3$responsive === undefined ? false : _ref3$responsive,
_ref3$excludeCss = _ref3.excludeCss,
excludeCss = _ref3$excludeCss === undefined ? false : _ref3$excludeCss;
return inlineImages(el).then(function () {
var clone = el.cloneNode(true);
clone.style.backgroundColor = (options || {}).backgroundColor || el.style.backgroundColor;
var _getDimensions = getDimensions(el, clone, w, h),
width = _getDimensions.width,
height = _getDimensions.height;
if (el.tagName !== 'svg') {
if (el.getBBox) {
if (clone.getAttribute('transform') != null) {
clone.setAttribute('transform', clone.getAttribute('transform').replace(/translate\(.*?\)/, ''));
}
var svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg');
svg.appendChild(clone);
clone = svg;
} else {
console.error('Attempted to render non-SVG element', el);
return;
}
}
clone.setAttribute('version', '1.1');
clone.setAttribute('viewBox', [left, top, width, height].join(' '));
if (!clone.getAttribute('xmlns')) clone.setAttributeNS(xmlNs, 'xmlns', svgNs);
if (!clone.getAttribute('xmlns:xlink')) clone.setAttributeNS(xmlNs, 'xmlns:xlink', 'http://www.w3.org/1999/xlink');
if (responsive) {
clone.removeAttribute('width');
clone.removeAttribute('height');
clone.setAttribute('preserveAspectRatio', 'xMinYMin meet');
} else {
clone.setAttribute('width', width * scale);
clone.setAttribute('height', height * scale);
}
Array.from(clone.querySelectorAll('foreignObject > *')).forEach(function (foreignObject) {
foreignObject.setAttributeNS(xmlNs, 'xmlns', foreignObject.tagName === 'svg' ? svgNs : xhtmlNs);
});
if (excludeCss) {
var outer = document.createElement('div');
outer.appendChild(clone);
var src = outer.innerHTML;
if (typeof done === 'function') done(src, width, height);else return { src: src, width: width, height: height };
} else {
return inlineCss(el, options).then(function (css) {
var style = document.createElement('style');
style.setAttribute('type', 'text/css');
style.innerHTML = '<![CDATA[\n' + css + '\n]]>';
var defs = document.createElement('defs');
defs.appendChild(style);
clone.insertBefore(defs, clone.firstChild);
var outer = document.createElement('div');
outer.appendChild(clone);
var src = outer.innerHTML.replace(/NS\d+:href/gi, 'xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href');
if (typeof done === 'function') done(src, width, height);else return { src: src, width: width, height: height };
});
}
});
};
out$.svgAsDataUri = function (el, options, done) {
requireDomNode(el);
return out$.prepareSvg(el, options).then(function (_ref4) {
var src = _ref4.src,
width = _ref4.width,
height = _ref4.height;
var svgXml = 'data:image/svg+xml;base64,' + window.btoa(reEncode(doctype + src));
if (typeof done === 'function') {
done(svgXml, width, height);
}
return svgXml;
});
};
out$.svgAsPngUri = function (el, options, done) {
requireDomNode(el);
var _ref5 = options || {},
_ref5$encoderType = _ref5.encoderType,
encoderType = _ref5$encoderType === undefined ? 'image/png' : _ref5$encoderType,
_ref5$encoderOptions = _ref5.encoderOptions,
encoderOptions = _ref5$encoderOptions === undefined ? 0.8 : _ref5$encoderOptions,
canvg = _ref5.canvg;
var convertToPng = function convertToPng(_ref6) {
var src = _ref6.src,
width = _ref6.width,
height = _ref6.height;
var canvas = document.createElement('canvas');
var context = canvas.getContext('2d');
var pixelRatio = window.devicePixelRatio || 1;
canvas.width = width * pixelRatio;
canvas.height = height * pixelRatio;
canvas.style.width = canvas.width + 'px';
canvas.style.height = canvas.height + 'px';
context.setTransform(pixelRatio, 0, 0, pixelRatio, 0, 0);
if (canvg) canvg(canvas, src);else context.drawImage(src, 0, 0);
var png = void 0;
try {
png = canvas.toDataURL(encoderType, encoderOptions);
} catch (e) {
if (typeof SecurityError !== 'undefined' && e instanceof SecurityError || e.name === 'SecurityError') {
console.error('Rendered SVG images cannot be downloaded in this browser.');
return;
} else throw e;
}
if (typeof done === 'function') done(png, canvas.width, canvas.height);
return Promise.resolve(png);
};
if (canvg) return out$.prepareSvg(el, options).then(convertToPng);else return out$.svgAsDataUri(el, options).then(function (uri) {
return new Promise(function (resolve, reject) {
var image = new Image();
image.onload = function () {
return resolve(convertToPng({
src: image,
width: image.width,
height: image.height
}));
};
image.onerror = function () {
reject('There was an error loading the data URI as an image on the following SVG\n' + window.atob(uri.slice(26)) + 'Open the following link to see browser\'s diagnosis\n' + uri);
};
image.src = uri;
});
});
};
out$.download = function (name, uri, options) {
if (navigator.msSaveOrOpenBlob) navigator.msSaveOrOpenBlob(uriToBlob(uri), name);else {
var saveLink = document.createElement('a');
if ('download' in saveLink) {
saveLink.download = name;
saveLink.style.display = 'none';
document.body.appendChild(saveLink);
try {
var blob = uriToBlob(uri);
var url = URL.createObjectURL(blob);
saveLink.href = url;
saveLink.onclick = function () {
return requestAnimationFrame(function () {
return URL.revokeObjectURL(url);
});
};
} catch (e) {
console.error(e);
console.warn('Error while getting object URL. Falling back to string URL.');
saveLink.href = uri;
}
saveLink.click();
document.body.removeChild(saveLink);
} else if (options && options.popup) {
options.popup.document.title = name;
options.popup.location.replace(uri);
}
}
};
out$.saveSvg = function (el, name, options) {
var downloadOpts = downloadOptions(); // don't inline, can't be async
return requireDomNodePromise(el).then(function (el) {
return out$.svgAsDataUri(el, options || {});
}).then(function (uri) {
return out$.download(name, uri, downloadOpts);
});
};
out$.saveSvgAsPng = function (el, name, options) {
var downloadOpts = downloadOptions(); // don't inline, can't be async
return requireDomNodePromise(el).then(function (el) {
return out$.svgAsPngUri(el, options || {});
}).then(function (uri) {
return out$.download(name, uri, downloadOpts);
});
};
})();