You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
408 lines
15 KiB
408 lines
15 KiB
(function() {
|
|
const out$ = typeof exports != 'undefined' && exports || typeof define != 'undefined' && {} || this || window;
|
|
if (typeof define !== 'undefined') define('save-svg-as-png', [], () => out$);
|
|
out$.default = out$;
|
|
|
|
const xmlNs = 'http://www.w3.org/2000/xmlns/';
|
|
const xhtmlNs = 'http://www.w3.org/1999/xhtml';
|
|
const svgNs = 'http://www.w3.org/2000/svg';
|
|
const 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 " ">]>';
|
|
const urlRegex = /url\(["']?(.+?)["']?\)/;
|
|
const 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'
|
|
};
|
|
|
|
const isElement = obj => obj instanceof HTMLElement || obj instanceof SVGElement;
|
|
const requireDomNode = el => {
|
|
if (!isElement(el)) throw new Error(`an HTMLElement or SVGElement is required; got ${el}`);
|
|
};
|
|
const requireDomNodePromise = el =>
|
|
new Promise((resolve, reject) => {
|
|
if (isElement(el)) resolve(el)
|
|
else reject(new Error(`an HTMLElement or SVGElement is required; got ${el}`));
|
|
})
|
|
const isExternal = url => url && url.lastIndexOf('http',0) === 0 && url.lastIndexOf(window.location.host) === -1;
|
|
|
|
const getFontMimeTypeFromUrl = fontUrl => {
|
|
const formats = Object.keys(fontFormats)
|
|
.filter(extension => fontUrl.indexOf(`.${extension}`) > 0)
|
|
.map(extension => fontFormats[extension]);
|
|
if (formats) return formats[0];
|
|
console.error(`Unknown font format for ${fontUrl}. Fonts may not be working correctly.`);
|
|
return 'application/octet-stream';
|
|
};
|
|
|
|
const arrayBufferToBase64 = buffer => {
|
|
let binary = '';
|
|
const bytes = new Uint8Array(buffer);
|
|
for (let i = 0; i < bytes.byteLength; i++) binary += String.fromCharCode(bytes[i]);
|
|
return window.btoa(binary);
|
|
}
|
|
|
|
const getDimension = (el, clone, dim) => {
|
|
const v =
|
|
(el.viewBox && el.viewBox.baseVal && el.viewBox.baseVal[dim]) ||
|
|
(clone.getAttribute(dim) !== null && !clone.getAttribute(dim).match(/%$/) && 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;
|
|
};
|
|
|
|
const 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) {
|
|
const {x, y, width, height} = el.getBBox();
|
|
return {
|
|
width: x + width,
|
|
height: y + height
|
|
};
|
|
}
|
|
};
|
|
|
|
const reEncode = data =>
|
|
decodeURIComponent(
|
|
encodeURIComponent(data)
|
|
.replace(/%([0-9A-F]{2})/g, (match, p1) => {
|
|
const c = String.fromCharCode(`0x${p1}`);
|
|
return c === '%' ? '%25' : c;
|
|
})
|
|
);
|
|
|
|
const uriToBlob = uri => {
|
|
const byteString = window.atob(uri.split(',')[1]);
|
|
const mimeString = uri.split(',')[0].split(':')[1].split(';')[0]
|
|
const buffer = new ArrayBuffer(byteString.length);
|
|
const intArray = new Uint8Array(buffer);
|
|
for (let i = 0; i < byteString.length; i++) {
|
|
intArray[i] = byteString.charCodeAt(i);
|
|
}
|
|
return new Blob([buffer], {type: mimeString});
|
|
};
|
|
|
|
const query = (el, selector) => {
|
|
if (!selector) return;
|
|
try {
|
|
return el.querySelector(selector) || el.parentNode && el.parentNode.querySelector(selector);
|
|
} catch(err) {
|
|
console.warn(`Invalid CSS selector "${selector}"`, err);
|
|
}
|
|
};
|
|
|
|
const 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);
|
|
// }
|
|
const match = rule.cssText.match(urlRegex);
|
|
const url = (match && match[1]) || '';
|
|
if (!url || url.match(/^data:/) || url === 'about:blank') return;
|
|
const fullUrl =
|
|
url.startsWith('../') ? `${href}/../${url}`
|
|
: url.startsWith('./') ? `${href}/.${url}`
|
|
: url;
|
|
return {
|
|
text: rule.cssText,
|
|
format: getFontMimeTypeFromUrl(fullUrl),
|
|
url: fullUrl
|
|
};
|
|
};
|
|
|
|
const inlineImages = el => Promise.all(
|
|
Array.from(el.querySelectorAll('image')).map(image => {
|
|
let 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((resolve, reject) => {
|
|
const canvas = document.createElement('canvas');
|
|
const img = new Image();
|
|
img.crossOrigin = 'anonymous';
|
|
img.src = href;
|
|
img.onerror = () => reject(new Error(`Could not load ${href}`));
|
|
img.onload = () => {
|
|
canvas.width = img.width;
|
|
canvas.height = img.height;
|
|
canvas.getContext('2d').drawImage(img, 0, 0);
|
|
image.setAttributeNS('http://www.w3.org/1999/xlink', 'href', canvas.toDataURL('image/png'));
|
|
resolve(true);
|
|
};
|
|
});
|
|
})
|
|
);
|
|
|
|
const cachedFonts = {};
|
|
const inlineFonts = fonts => Promise.all(
|
|
fonts.map(font =>
|
|
new Promise((resolve, reject) => {
|
|
if (cachedFonts[font.url]) return resolve(cachedFonts[font.url]);
|
|
|
|
const req = new XMLHttpRequest();
|
|
req.addEventListener('load', () => {
|
|
// TODO: it may also be worth it to wait until fonts are fully loaded before
|
|
// attempting to rasterize them. (e.g. use https://developer.mozilla.org/en-US/docs/Web/API/FontFaceSet)
|
|
const fontInBase64 = arrayBufferToBase64(req.response);
|
|
const fontUri = font.text.replace(urlRegex, `url("data:${font.format};base64,${fontInBase64}")`)+'\n';
|
|
cachedFonts[font.url] = fontUri;
|
|
resolve(fontUri);
|
|
});
|
|
req.addEventListener('error', e => {
|
|
console.warn(`Failed to load font from: ${font.url}`, e);
|
|
cachedFonts[font.url] = null;
|
|
resolve(null);
|
|
});
|
|
req.addEventListener('abort', e => {
|
|
console.warn(`Aborted loading font from: ${font.url}`, e);
|
|
resolve(null);
|
|
});
|
|
req.open('GET', font.url);
|
|
req.responseType = 'arraybuffer';
|
|
req.send();
|
|
})
|
|
)
|
|
).then(fontCss => fontCss.filter(x => x).join(''));
|
|
|
|
let cachedRules = null;
|
|
const styleSheetRules = () => {
|
|
if (cachedRules) return cachedRules;
|
|
return cachedRules = Array.from(document.styleSheets).map(sheet => {
|
|
try {
|
|
return {rules: sheet.cssRules, href: sheet.href};
|
|
} catch (e) {
|
|
console.warn(`Stylesheet could not be loaded: ${sheet.href}`, e);
|
|
return {};
|
|
}
|
|
});
|
|
};
|
|
|
|
const inlineCss = (el, options) => {
|
|
const {
|
|
selectorRemap,
|
|
modifyStyle,
|
|
modifyCss,
|
|
fonts,
|
|
excludeUnusedCss
|
|
} = options || {};
|
|
const generateCss = modifyCss || ((selector, properties) => {
|
|
const sel = selectorRemap ? selectorRemap(selector) : selector;
|
|
const props = modifyStyle ? modifyStyle(properties) : properties;
|
|
return `${sel}{${props}}\n`;
|
|
});
|
|
const css = [];
|
|
const detectFonts = typeof fonts === 'undefined';
|
|
const fontList = fonts || [];
|
|
styleSheetRules().forEach(({rules, href}) => {
|
|
if (!rules) return;
|
|
Array.from(rules).forEach(rule => {
|
|
if (typeof rule.style != 'undefined') {
|
|
if (query(el, rule.selectorText)) css.push(generateCss(rule.selectorText, rule.style.cssText));
|
|
else if (detectFonts && rule.cssText.match(/^@font-face/)) {
|
|
const font = detectCssFont(rule, href);
|
|
if (font) fontList.push(font);
|
|
} else if (!excludeUnusedCss) {
|
|
css.push(rule.cssText);
|
|
}
|
|
}
|
|
});
|
|
});
|
|
|
|
return inlineFonts(fontList).then(fontCss => css.join('\n') + fontCss);
|
|
};
|
|
|
|
const downloadOptions = () => {
|
|
if (!navigator.msSaveOrOpenBlob && !('download' in document.createElement('a'))) {
|
|
return {popup: window.open()};
|
|
}
|
|
};
|
|
|
|
out$.prepareSvg = (el, options, done) => {
|
|
requireDomNode(el);
|
|
const {
|
|
left = 0,
|
|
top = 0,
|
|
width: w,
|
|
height: h,
|
|
scale = 1,
|
|
responsive = false,
|
|
excludeCss = false,
|
|
} = options || {};
|
|
|
|
return inlineImages(el).then(() => {
|
|
let clone = el.cloneNode(true);
|
|
clone.style.backgroundColor = (options || {}).backgroundColor || el.style.backgroundColor;
|
|
const {width, height} = getDimensions(el, clone, w, h);
|
|
|
|
if (el.tagName !== 'svg') {
|
|
if (el.getBBox) {
|
|
if (clone.getAttribute('transform') != null) {
|
|
clone.setAttribute('transform', clone.getAttribute('transform').replace(/translate\(.*?\)/, ''));
|
|
}
|
|
const 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(foreignObject => {
|
|
foreignObject.setAttributeNS(xmlNs, 'xmlns', foreignObject.tagName === 'svg' ? svgNs : xhtmlNs);
|
|
});
|
|
|
|
if (excludeCss) {
|
|
const outer = document.createElement('div');
|
|
outer.appendChild(clone);
|
|
const src = outer.innerHTML;
|
|
if (typeof done === 'function') done(src, width, height);
|
|
else return {src, width, height};
|
|
} else {
|
|
return inlineCss(el, options).then(css => {
|
|
const style = document.createElement('style');
|
|
style.setAttribute('type', 'text/css');
|
|
style.innerHTML = `<![CDATA[\n${css}\n]]>`;
|
|
|
|
const defs = document.createElement('defs');
|
|
defs.appendChild(style);
|
|
clone.insertBefore(defs, clone.firstChild);
|
|
|
|
const outer = document.createElement('div');
|
|
outer.appendChild(clone);
|
|
const src = outer.innerHTML.replace(/NS\d+:href/gi, 'xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href');
|
|
|
|
if (typeof done === 'function') done(src, width, height);
|
|
else return {src, width, height};
|
|
});
|
|
}
|
|
});
|
|
};
|
|
|
|
out$.svgAsDataUri = (el, options, done) => {
|
|
requireDomNode(el);
|
|
return out$.prepareSvg(el, options)
|
|
.then(({src, width, height}) => {
|
|
const svgXml = `data:image/svg+xml;base64,${window.btoa(reEncode(doctype+src))}`;
|
|
if (typeof done === 'function') {
|
|
done(svgXml, width, height);
|
|
}
|
|
return svgXml;
|
|
});
|
|
};
|
|
|
|
out$.svgAsPngUri = (el, options, done) => {
|
|
requireDomNode(el);
|
|
const {
|
|
encoderType = 'image/png',
|
|
encoderOptions = 0.8,
|
|
canvg
|
|
} = options || {};
|
|
|
|
const convertToPng = ({src, width, height}) => {
|
|
const canvas = document.createElement('canvas');
|
|
const context = canvas.getContext('2d');
|
|
const pixelRatio = window.devicePixelRatio || 1;
|
|
|
|
canvas.width = width * pixelRatio;
|
|
canvas.height = height * pixelRatio;
|
|
canvas.style.width = `${canvas.width}px`;
|
|
canvas.style.height = `${canvas.height}px`;
|
|
context.setTransform(pixelRatio, 0, 0, pixelRatio, 0, 0);
|
|
|
|
if (canvg) canvg(canvas, src);
|
|
else context.drawImage(src, 0, 0);
|
|
|
|
let png;
|
|
try {
|
|
png = canvas.toDataURL(encoderType, encoderOptions);
|
|
} catch (e) {
|
|
if ((typeof SecurityError !== 'undefined' && e instanceof SecurityError) || e.name === 'SecurityError') {
|
|
console.error('Rendered SVG images cannot be downloaded in this browser.');
|
|
return;
|
|
} else throw e;
|
|
}
|
|
if (typeof done === 'function') done(png, canvas.width, canvas.height);
|
|
return Promise.resolve(png);
|
|
}
|
|
|
|
if (canvg) return out$.prepareSvg(el, options).then(convertToPng);
|
|
else return out$.svgAsDataUri(el, options).then(uri => {
|
|
return new Promise((resolve, reject) => {
|
|
const image = new Image();
|
|
image.onload = () => resolve(convertToPng({
|
|
src: image,
|
|
width: image.width,
|
|
height: image.height
|
|
}));
|
|
image.onerror = () => {
|
|
reject(`There was an error loading the data URI as an image on the following SVG\n${window.atob(uri.slice(26))}Open the following link to see browser's diagnosis\n${uri}`);
|
|
}
|
|
image.src = uri;
|
|
})
|
|
});
|
|
};
|
|
|
|
out$.download = (name, uri, options) => {
|
|
if (navigator.msSaveOrOpenBlob) navigator.msSaveOrOpenBlob(uriToBlob(uri), name);
|
|
else {
|
|
const saveLink = document.createElement('a');
|
|
if ('download' in saveLink) {
|
|
saveLink.download = name;
|
|
saveLink.style.display = 'none';
|
|
document.body.appendChild(saveLink);
|
|
try {
|
|
const blob = uriToBlob(uri);
|
|
const url = URL.createObjectURL(blob);
|
|
saveLink.href = url;
|
|
saveLink.onclick = () => requestAnimationFrame(() => 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$.saveSvg = (el, name, options) => {
|
|
const downloadOpts = downloadOptions(); // don't inline, can't be async
|
|
return requireDomNodePromise(el)
|
|
.then(el => out$.svgAsDataUri(el, options || {}))
|
|
.then(uri => out$.download(name, uri, downloadOpts));
|
|
};
|
|
|
|
out$.saveSvgAsPng = (el, name, options) => {
|
|
const downloadOpts = downloadOptions(); // don't inline, can't be async
|
|
return requireDomNodePromise(el)
|
|
.then(el => out$.svgAsPngUri(el, options || {}))
|
|
.then(uri => out$.download(name, uri, downloadOpts));
|
|
};
|
|
})();
|