html2canvas/dist/html2canvas.js
2014-09-16 20:12:13 +03:00

2700 lines
98 KiB
JavaScript

/*
html2canvas 0.5.0-alpha <http://html2canvas.hertzen.com>
Copyright (c) 2014 Niklas von Hertzen
Released under MIT License
*/
(function(window, document, undefined){
/*
Copyright (c) 2013 Yehuda Katz, Tom Dale, and contributors
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.
*/
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if (typeof(Object.create) !== "function" || typeof(document.createElement("canvas").getContext) !== "function") {
window.html2canvas = function() {
return Promise.reject("No canvas support");
};
return;
}
/*! https://mths.be/punycode v1.3.1 by @mathias */
;(function(root) {
/** Detect free variables */
var freeExports = typeof exports == 'object' && exports &&
!exports.nodeType && exports;
var freeModule = typeof module == 'object' && module &&
!module.nodeType && module;
var freeGlobal = typeof global == 'object' && global;
if (
freeGlobal.global === freeGlobal ||
freeGlobal.window === freeGlobal ||
freeGlobal.self === freeGlobal
) {
root = freeGlobal;
}
/**
* The `punycode` object.
* @name punycode
* @type Object
*/
var punycode,
/** Highest positive signed 32-bit float value */
maxInt = 2147483647, // aka. 0x7FFFFFFF or 2^31-1
/** Bootstring parameters */
base = 36,
tMin = 1,
tMax = 26,
skew = 38,
damp = 700,
initialBias = 72,
initialN = 128, // 0x80
delimiter = '-', // '\x2D'
/** Regular expressions */
regexPunycode = /^xn--/,
regexNonASCII = /[^\x20-\x7E]/, // unprintable ASCII chars + non-ASCII chars
regexSeparators = /[\x2E\u3002\uFF0E\uFF61]/g, // RFC 3490 separators
/** Error messages */
errors = {
'overflow': 'Overflow: input needs wider integers to process',
'not-basic': 'Illegal input >= 0x80 (not a basic code point)',
'invalid-input': 'Invalid input'
},
/** Convenience shortcuts */
baseMinusTMin = base - tMin,
floor = Math.floor,
stringFromCharCode = String.fromCharCode,
/** Temporary variable */
key;
/*--------------------------------------------------------------------------*/
/**
* A generic error utility function.
* @private
* @param {String} type The error type.
* @returns {Error} Throws a `RangeError` with the applicable error message.
*/
function error(type) {
throw RangeError(errors[type]);
}
/**
* A generic `Array#map` utility function.
* @private
* @param {Array} array The array to iterate over.
* @param {Function} callback The function that gets called for every array
* item.
* @returns {Array} A new array of values returned by the callback function.
*/
function map(array, fn) {
var length = array.length;
var result = [];
while (length--) {
result[length] = fn(array[length]);
}
return result;
}
/**
* A simple `Array#map`-like wrapper to work with domain name strings or email
* addresses.
* @private
* @param {String} domain The domain name or email address.
* @param {Function} callback The function that gets called for every
* character.
* @returns {Array} A new string of characters returned by the callback
* function.
*/
function mapDomain(string, fn) {
var parts = string.split('@');
var result = '';
if (parts.length > 1) {
// In email addresses, only the domain name should be punycoded. Leave
// the local part (i.e. everything up to `@`) intact.
result = parts[0] + '@';
string = parts[1];
}
var labels = string.split(regexSeparators);
var encoded = map(labels, fn).join('.');
return result + encoded;
}
/**
* Creates an array containing the numeric code points of each Unicode
* character in the string. While JavaScript uses UCS-2 internally,
* this function will convert a pair of surrogate halves (each of which
* UCS-2 exposes as separate characters) into a single code point,
* matching UTF-16.
* @see `punycode.ucs2.encode`
* @see <https://mathiasbynens.be/notes/javascript-encoding>
* @memberOf punycode.ucs2
* @name decode
* @param {String} string The Unicode input string (UCS-2).
* @returns {Array} The new array of code points.
*/
function ucs2decode(string) {
var output = [],
counter = 0,
length = string.length,
value,
extra;
while (counter < length) {
value = string.charCodeAt(counter++);
if (value >= 0xD800 && value <= 0xDBFF && counter < length) {
// high surrogate, and there is a next character
extra = string.charCodeAt(counter++);
if ((extra & 0xFC00) == 0xDC00) { // low surrogate
output.push(((value & 0x3FF) << 10) + (extra & 0x3FF) + 0x10000);
} else {
// unmatched surrogate; only append this code unit, in case the next
// code unit is the high surrogate of a surrogate pair
output.push(value);
counter--;
}
} else {
output.push(value);
}
}
return output;
}
/**
* Creates a string based on an array of numeric code points.
* @see `punycode.ucs2.decode`
* @memberOf punycode.ucs2
* @name encode
* @param {Array} codePoints The array of numeric code points.
* @returns {String} The new Unicode string (UCS-2).
*/
function ucs2encode(array) {
return map(array, function(value) {
var output = '';
if (value > 0xFFFF) {
value -= 0x10000;
output += stringFromCharCode(value >>> 10 & 0x3FF | 0xD800);
value = 0xDC00 | value & 0x3FF;
}
output += stringFromCharCode(value);
return output;
}).join('');
}
/**
* Converts a basic code point into a digit/integer.
* @see `digitToBasic()`
* @private
* @param {Number} codePoint The basic numeric code point value.
* @returns {Number} The numeric value of a basic code point (for use in
* representing integers) in the range `0` to `base - 1`, or `base` if
* the code point does not represent a value.
*/
function basicToDigit(codePoint) {
if (codePoint - 48 < 10) {
return codePoint - 22;
}
if (codePoint - 65 < 26) {
return codePoint - 65;
}
if (codePoint - 97 < 26) {
return codePoint - 97;
}
return base;
}
/**
* Converts a digit/integer into a basic code point.
* @see `basicToDigit()`
* @private
* @param {Number} digit The numeric value of a basic code point.
* @returns {Number} The basic code point whose value (when used for
* representing integers) is `digit`, which needs to be in the range
* `0` to `base - 1`. If `flag` is non-zero, the uppercase form is
* used; else, the lowercase form is used. The behavior is undefined
* if `flag` is non-zero and `digit` has no uppercase form.
*/
function digitToBasic(digit, flag) {
// 0..25 map to ASCII a..z or A..Z
// 26..35 map to ASCII 0..9
return digit + 22 + 75 * (digit < 26) - ((flag != 0) << 5);
}
/**
* Bias adaptation function as per section 3.4 of RFC 3492.
* http://tools.ietf.org/html/rfc3492#section-3.4
* @private
*/
function adapt(delta, numPoints, firstTime) {
var k = 0;
delta = firstTime ? floor(delta / damp) : delta >> 1;
delta += floor(delta / numPoints);
for (/* no initialization */; delta > baseMinusTMin * tMax >> 1; k += base) {
delta = floor(delta / baseMinusTMin);
}
return floor(k + (baseMinusTMin + 1) * delta / (delta + skew));
}
/**
* Converts a Punycode string of ASCII-only symbols to a string of Unicode
* symbols.
* @memberOf punycode
* @param {String} input The Punycode string of ASCII-only symbols.
* @returns {String} The resulting string of Unicode symbols.
*/
function decode(input) {
// Don't use UCS-2
var output = [],
inputLength = input.length,
out,
i = 0,
n = initialN,
bias = initialBias,
basic,
j,
index,
oldi,
w,
k,
digit,
t,
/** Cached calculation results */
baseMinusT;
// Handle the basic code points: let `basic` be the number of input code
// points before the last delimiter, or `0` if there is none, then copy
// the first basic code points to the output.
basic = input.lastIndexOf(delimiter);
if (basic < 0) {
basic = 0;
}
for (j = 0; j < basic; ++j) {
// if it's not a basic code point
if (input.charCodeAt(j) >= 0x80) {
error('not-basic');
}
output.push(input.charCodeAt(j));
}
// Main decoding loop: start just after the last delimiter if any basic code
// points were copied; start at the beginning otherwise.
for (index = basic > 0 ? basic + 1 : 0; index < inputLength; /* no final expression */) {
// `index` is the index of the next character to be consumed.
// Decode a generalized variable-length integer into `delta`,
// which gets added to `i`. The overflow checking is easier
// if we increase `i` as we go, then subtract off its starting
// value at the end to obtain `delta`.
for (oldi = i, w = 1, k = base; /* no condition */; k += base) {
if (index >= inputLength) {
error('invalid-input');
}
digit = basicToDigit(input.charCodeAt(index++));
if (digit >= base || digit > floor((maxInt - i) / w)) {
error('overflow');
}
i += digit * w;
t = k <= bias ? tMin : (k >= bias + tMax ? tMax : k - bias);
if (digit < t) {
break;
}
baseMinusT = base - t;
if (w > floor(maxInt / baseMinusT)) {
error('overflow');
}
w *= baseMinusT;
}
out = output.length + 1;
bias = adapt(i - oldi, out, oldi == 0);
// `i` was supposed to wrap around from `out` to `0`,
// incrementing `n` each time, so we'll fix that now:
if (floor(i / out) > maxInt - n) {
error('overflow');
}
n += floor(i / out);
i %= out;
// Insert `n` at position `i` of the output
output.splice(i++, 0, n);
}
return ucs2encode(output);
}
/**
* Converts a string of Unicode symbols (e.g. a domain name label) to a
* Punycode string of ASCII-only symbols.
* @memberOf punycode
* @param {String} input The string of Unicode symbols.
* @returns {String} The resulting Punycode string of ASCII-only symbols.
*/
function encode(input) {
var n,
delta,
handledCPCount,
basicLength,
bias,
j,
m,
q,
k,
t,
currentValue,
output = [],
/** `inputLength` will hold the number of code points in `input`. */
inputLength,
/** Cached calculation results */
handledCPCountPlusOne,
baseMinusT,
qMinusT;
// Convert the input in UCS-2 to Unicode
input = ucs2decode(input);
// Cache the length
inputLength = input.length;
// Initialize the state
n = initialN;
delta = 0;
bias = initialBias;
// Handle the basic code points
for (j = 0; j < inputLength; ++j) {
currentValue = input[j];
if (currentValue < 0x80) {
output.push(stringFromCharCode(currentValue));
}
}
handledCPCount = basicLength = output.length;
// `handledCPCount` is the number of code points that have been handled;
// `basicLength` is the number of basic code points.
// Finish the basic string - if it is not empty - with a delimiter
if (basicLength) {
output.push(delimiter);
}
// Main encoding loop:
while (handledCPCount < inputLength) {
// All non-basic code points < n have been handled already. Find the next
// larger one:
for (m = maxInt, j = 0; j < inputLength; ++j) {
currentValue = input[j];
if (currentValue >= n && currentValue < m) {
m = currentValue;
}
}
// Increase `delta` enough to advance the decoder's <n,i> state to <m,0>,
// but guard against overflow
handledCPCountPlusOne = handledCPCount + 1;
if (m - n > floor((maxInt - delta) / handledCPCountPlusOne)) {
error('overflow');
}
delta += (m - n) * handledCPCountPlusOne;
n = m;
for (j = 0; j < inputLength; ++j) {
currentValue = input[j];
if (currentValue < n && ++delta > maxInt) {
error('overflow');
}
if (currentValue == n) {
// Represent delta as a generalized variable-length integer
for (q = delta, k = base; /* no condition */; k += base) {
t = k <= bias ? tMin : (k >= bias + tMax ? tMax : k - bias);
if (q < t) {
break;
}
qMinusT = q - t;
baseMinusT = base - t;
output.push(
stringFromCharCode(digitToBasic(t + qMinusT % baseMinusT, 0))
);
q = floor(qMinusT / baseMinusT);
}
output.push(stringFromCharCode(digitToBasic(q, 0)));
bias = adapt(delta, handledCPCountPlusOne, handledCPCount == basicLength);
delta = 0;
++handledCPCount;
}
}
++delta;
++n;
}
return output.join('');
}
/**
* Converts a Punycode string representing a domain name or an email address
* to Unicode. Only the Punycoded parts of the input will be converted, i.e.
* it doesn't matter if you call it on a string that has already been
* converted to Unicode.
* @memberOf punycode
* @param {String} input The Punycoded domain name or email address to
* convert to Unicode.
* @returns {String} The Unicode representation of the given Punycode
* string.
*/
function toUnicode(input) {
return mapDomain(input, function(string) {
return regexPunycode.test(string)
? decode(string.slice(4).toLowerCase())
: string;
});
}
/**
* Converts a Unicode string representing a domain name or an email address to
* Punycode. Only the non-ASCII parts of the domain name will be converted,
* i.e. it doesn't matter if you call it with a domain that's already in
* ASCII.
* @memberOf punycode
* @param {String} input The domain name or email address to convert, as a
* Unicode string.
* @returns {String} The Punycode representation of the given domain name or
* email address.
*/
function toASCII(input) {
return mapDomain(input, function(string) {
return regexNonASCII.test(string)
? 'xn--' + encode(string)
: string;
});
}
/*--------------------------------------------------------------------------*/
/** Define the public API */
punycode = {
/**
* A string representing the current Punycode.js version number.
* @memberOf punycode
* @type String
*/
'version': '1.3.1',
/**
* An object of methods to convert from JavaScript's internal character
* representation (UCS-2) to Unicode code points, and back.
* @see <https://mathiasbynens.be/notes/javascript-encoding>
* @memberOf punycode
* @type Object
*/
'ucs2': {
'decode': ucs2decode,
'encode': ucs2encode
},
'decode': decode,
'encode': encode,
'toASCII': toASCII,
'toUnicode': toUnicode
};
/** Expose `punycode` */
// Some AMD build optimizers, like r.js, check for specific condition patterns
// like the following:
if (
typeof define == 'function' &&
typeof define.amd == 'object' &&
define.amd
) {
define('punycode', function() {
return punycode;
});
} else if (freeExports && freeModule) {
if (module.exports == freeExports) { // in Node.js or RingoJS v0.8.0+
freeModule.exports = punycode;
} else { // in Narwhal or RingoJS v0.7.0-
for (key in punycode) {
punycode.hasOwnProperty(key) && (freeExports[key] = punycode[key]);
}
}
} else { // in Rhino or a web browser
root.punycode = punycode;
}
}(this));
var html2canvasNodeAttribute = "data-html2canvas-node";
window.html2canvas = function(nodeList, options) {
options = options || {};
if (options.logging) {
window.html2canvas.logging = true;
window.html2canvas.start = Date.now();
}
options.async = typeof(options.async) === "undefined" ? true : options.async;
options.allowTaint = typeof(options.allowTaint) === "undefined" ? false : options.allowTaint;
options.removeContainer = typeof(options.removeContainer) === "undefined" ? true : options.removeContainer;
var node = ((nodeList === undefined) ? [document.documentElement] : ((nodeList.length) ? nodeList : [nodeList]))[0];
node.setAttribute(html2canvasNodeAttribute, "true");
return renderDocument(node.ownerDocument, options, window.innerWidth, window.innerHeight).then(function(canvas) {
if (typeof(options.onrendered) === "function") {
log("options.onrendered is deprecated, html2canvas returns a Promise containing the canvas");
options.onrendered(canvas);
}
return canvas;
});
};
window.html2canvas.punycode = this.punycode;
function renderDocument(document, options, windowWidth, windowHeight) {
return createWindowClone(document, windowWidth, windowHeight, options).then(function(container) {
log("Document cloned");
var selector = "[" + html2canvasNodeAttribute + "='true']";
document.querySelector(selector).removeAttribute(html2canvasNodeAttribute);
var clonedWindow = container.contentWindow;
var node = clonedWindow.document.querySelector(selector);
var support = new Support(clonedWindow.document);
var imageLoader = new ImageLoader(options, support);
var bounds = getBounds(node);
var width = options.width != null ? options.width : options.type === "view" ? Math.min(bounds.width, windowWidth) : documentWidth();
var height = options.height != null ? options.height : options.type === "view" ? Math.min(bounds.height, windowHeight) : documentHeight();
var renderer = new CanvasRenderer(width, height, imageLoader, options, document);
var parser = new NodeParser(node, renderer, support, imageLoader, options);
return parser.ready.then(function() {
log("Finished rendering");
var canvas = (options.type !== "view" && (node === clonedWindow.document.body || node === clonedWindow.document.documentElement)) ? renderer.canvas : crop(renderer.canvas, bounds);
if (options.removeContainer) {
container.parentNode.removeChild(container);
log("Cleaned up container");
}
return canvas;
});
});
}
function crop(canvas, bounds) {
var croppedCanvas = document.createElement("canvas");
var x1 = Math.min(canvas.width - 1, Math.max(0, bounds.left));
var x2 = Math.min(canvas.width, Math.max(1, bounds.left + bounds.width));
var y1 = Math.min(canvas.height - 1, Math.max(0, bounds.top));
var y2 = Math.min(canvas.height, Math.max(1, bounds.top + bounds.height));
var width = croppedCanvas.width = x2 - x1;
var height = croppedCanvas.height = y2 - y1;
log("Cropping canvas at:", "left:", bounds.left, "top:", bounds.top, "width:", bounds.width, "height:", bounds.height);
log("Resulting crop with width", width, "and height", height, " with x", x1, "and y", y1);
croppedCanvas.getContext("2d").drawImage(canvas, x1, y1, width, height, 0, 0, width, height);
return croppedCanvas;
}
function documentWidth () {
return Math.max(
Math.max(document.body.scrollWidth, document.documentElement.scrollWidth),
Math.max(document.body.offsetWidth, document.documentElement.offsetWidth),
Math.max(document.body.clientWidth, document.documentElement.clientWidth)
);
}
function documentHeight () {
return Math.max(
Math.max(document.body.scrollHeight, document.documentElement.scrollHeight),
Math.max(document.body.offsetHeight, document.documentElement.offsetHeight),
Math.max(document.body.clientHeight, document.documentElement.clientHeight)
);
}
function smallImage() {
return "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7";
}
function createWindowClone(ownerDocument, width, height, options) {
var documentElement = ownerDocument.documentElement.cloneNode(true),
container = ownerDocument.createElement("iframe");
container.style.visibility = "hidden";
container.style.position = "absolute";
container.style.left = container.style.top = "-10000px";
container.width = width;
container.height = height;
container.scrolling = "no"; // ios won't scroll without it
ownerDocument.body.appendChild(container);
return new Promise(function(resolve) {
var documentClone = container.contentWindow.document;
/* Chrome doesn't detect relative background-images assigned in inline <style> sheets when fetched through getComputedStyle
if window url is about:blank, we can assign the url to current by writing onto the document
*/
container.contentWindow.onload = container.onload = function() {
resolve(container);
};
documentClone.open();
documentClone.write("<!DOCTYPE html>");
documentClone.close();
documentClone.replaceChild(removeScriptNodes(documentClone.adoptNode(documentElement)), documentClone.documentElement);
if (options.type === "view") {
container.contentWindow.scrollTo(window.pageXOffset, window.pageYOffset);
}
});
}
function removeScriptNodes(parent) {
[].slice.call(parent.childNodes, 0).filter(isElementNode).forEach(function(node) {
if (node.tagName === "SCRIPT") {
parent.removeChild(node);
} else {
removeScriptNodes(node);
}
});
return parent;
}
function isElementNode(node) {
return node.nodeType === Node.ELEMENT_NODE;
}
function DummyImageContainer(src) {
this.src = src;
log("DummyImageContainer for", src);
if (!this.promise || !this.image) {
log("Initiating DummyImageContainer");
DummyImageContainer.prototype.image = new Image();
var image = this.image;
DummyImageContainer.prototype.promise = new Promise(function(resolve, reject) {
image.onload = resolve;
image.onerror = reject;
image.src = smallImage();
if (image.complete === true) {
resolve(image);
}
});
}
}
function Font(family, size) {
var container = document.createElement('div'),
img = document.createElement('img'),
span = document.createElement('span'),
sampleText = 'Hidden Text',
baseline,
middle;
container.style.visibility = "hidden";
container.style.fontFamily = family;
container.style.fontSize = size;
container.style.margin = 0;
container.style.padding = 0;
document.body.appendChild(container);
img.src = smallImage();
img.width = 1;
img.height = 1;
img.style.margin = 0;
img.style.padding = 0;
img.style.verticalAlign = "baseline";
span.style.fontFamily = family;
span.style.fontSize = size;
span.style.margin = 0;
span.style.padding = 0;
span.appendChild(document.createTextNode(sampleText));
container.appendChild(span);
container.appendChild(img);
baseline = (img.offsetTop - span.offsetTop) + 1;
container.removeChild(span);
container.appendChild(document.createTextNode(sampleText));
container.style.lineHeight = "normal";
img.style.verticalAlign = "super";
middle = (img.offsetTop-container.offsetTop) + 1;
document.body.removeChild(container);
this.baseline = baseline;
this.lineWidth = 1;
this.middle = middle;
}
function FontMetrics() {
this.data = {};
}
FontMetrics.prototype.getMetrics = function(family, size) {
if (this.data[family + "-" + size] === undefined) {
this.data[family + "-" + size] = new Font(family, size);
}
return this.data[family + "-" + size];
};
function FrameContainer(container) {
this.image = null;
this.src = container;
var self = this;
var bounds = getBounds(container);
this.promise = new Promise(function(resolve) {
if (container.contentWindow.document.URL === "about:blank" || container.contentWindow.document.documentElement == null) {
container.contentWindow.onload = container.onload = function() {
resolve(container);
};
} else {
resolve(container);
}
}).then(function(container) {
return html2canvas(container.contentWindow.document.documentElement, {
width: bounds.width,
height: bounds.height
});
}).then(function(canvas) {
return self.image = canvas;
});
}
function GradientContainer(imageData) {
this.src = imageData.value;
this.colorStops = [];
this.type = null;
this.x0 = 0.5;
this.y0 = 0.5;
this.x1 = 0.5;
this.y1 = 0.5;
this.promise = Promise.resolve(true);
}
GradientContainer.prototype.TYPES = {
LINEAR: 1,
RADIAL: 2
};
GradientContainer.prototype.angleRegExp = /([+-]?\d*\.?\d+)(deg|grad|rad|turn)/;
function ImageContainer(src, cors) {
this.src = src;
this.image = new Image();
var self = this;
this.tainted = null;
this.promise = new Promise(function(resolve, reject) {
self.image.onload = resolve;
self.image.onerror = reject;
if (cors) {
self.image.crossOrigin = "anonymous";
}
self.image.src = src;
if (self.image.complete === true) {
resolve(self.image);
}
})['catch'](function() {
var dummy = new DummyImageContainer(src);
return dummy.promise.then(function(image) {
self.image = image;
});
});
}
function ImageLoader(options, support) {
this.link = null;
this.options = options;
this.support = support;
this.origin = window.location.protocol + window.location.hostname + window.location.port;
}
ImageLoader.prototype.findImages = function(nodes) {
var images = [];
nodes.reduce(function(imageNodes, container) {
switch(container.node.nodeName) {
case "IMG":
return imageNodes.concat([{
args: [container.node.src],
method: "url"
}]);
case "svg":
case "IFRAME":
return imageNodes.concat([{
args: [container.node],
method: container.node.nodeName
}]);
}
return imageNodes;
}, []).forEach(this.addImage(images, this.loadImage), this);
return images;
};
ImageLoader.prototype.findBackgroundImage = function(images, container) {
container.parseBackgroundImages().filter(this.hasImageBackground).forEach(this.addImage(images, this.loadImage), this);
return images;
};
ImageLoader.prototype.addImage = function(images, callback) {
return function(newImage) {
newImage.args.forEach(function(image) {
if (!this.imageExists(images, image)) {
images.splice(0, 0, callback.call(this, newImage));
log('Added image #' + (images.length), typeof(image) === "string" ? image.substring(0, 100) : image);
}
}, this);
};
};
ImageLoader.prototype.hasImageBackground = function(imageData) {
return imageData.method !== "none";
};
ImageLoader.prototype.loadImage = function(imageData) {
if (imageData.method === "url") {
var src = imageData.args[0];
if (this.isSVG(src) && !this.support.svg && !this.options.allowTaint) {
return new SVGContainer(src);
} else if (src.match(/data:image\/.*;base64,/i)) {
return new ImageContainer(src.replace(/url\(['"]{0,}|['"]{0,}\)$/ig, ''), false);
} else if (this.isSameOrigin(src) || this.options.allowTaint === true || this.isSVG(src)) {
return new ImageContainer(src, false);
} else if (this.support.cors && !this.options.allowTaint && this.options.useCORS) {
return new ImageContainer(src, true);
} else if (this.options.proxy) {
return new ProxyImageContainer(src, this.options.proxy);
} else {
return new DummyImageContainer(src);
}
} else if (imageData.method === "linear-gradient") {
return new LinearGradientContainer(imageData);
} else if (imageData.method === "gradient") {
return new WebkitGradientContainer(imageData);
} else if (imageData.method === "svg") {
return new SVGNodeContainer(imageData.args[0]);
} else if (imageData.method === "IFRAME") {
return new FrameContainer(imageData.args[0]);
} else {
return new DummyImageContainer(imageData);
}
};
ImageLoader.prototype.isSVG = function(src) {
return (/(.+).svg$/i.test(src)) || SVGContainer.prototype.isInline(src);
};
ImageLoader.prototype.imageExists = function(images, src) {
return images.some(function(image) {
return image.src === src;
});
};
ImageLoader.prototype.isSameOrigin = function(url) {
var link = this.link || (this.link = document.createElement("a"));
link.href = url;
link.href = link.href; // IE9, LOL! - http://jsfiddle.net/niklasvh/2e48b/
var origin = link.protocol + link.hostname + link.port;
return (origin === this.origin);
};
ImageLoader.prototype.getPromise = function(container) {
return container.promise;
};
ImageLoader.prototype.get = function(src) {
var found = null;
return this.images.some(function(img) {
return (found = img).src === src;
}) ? found : null;
};
ImageLoader.prototype.fetch = function(nodes) {
this.images = nodes.reduce(bind(this.findBackgroundImage, this), this.findImages(nodes));
this.images.forEach(function(image, index) {
image.promise.then(function() {
log("Succesfully loaded image #"+ (index+1));
}, function() {
log("Failed loading image #"+ (index+1));
});
});
this.ready = Promise.all(this.images.map(this.getPromise));
log("Finished searching images");
return this;
};
function isImage(container) {
return container.node.nodeName === "IMG";
}
function isSVGNode(container) {
return container.node.nodeName === "svg";
}
function urlImage(container) {
return {
args: [container.node.src],
method: "url"
};
}
function svgImage(container) {
return {
args: [container.node],
method: "svg"
};
}
function LinearGradientContainer(imageData) {
GradientContainer.apply(this, arguments);
this.type = this.TYPES.LINEAR;
var hasDirection = imageData.args[0].match(this.stepRegExp) === null;
if (hasDirection) {
imageData.args[0].split(" ").reverse().forEach(function(position) {
switch(position) {
case "left":
this.x0 = 0;
this.x1 = 1;
break;
case "top":
this.y0 = 0;
this.y1 = 1;
break;
case "right":
this.x0 = 1;
this.x1 = 0;
break;
case "bottom":
this.y0 = 1;
this.y1 = 0;
break;
case "to":
var y0 = this.y0;
var x0 = this.x0;
this.y0 = this.y1;
this.x0 = this.x1;
this.x1 = x0;
this.y1 = y0;
break;
default:
var angle = position.match(this.angleRegExp);
if (angle) {
switch(angle[2]) {
case "deg":
var angleDeg = parseFloat(angle[1]);
var radians = angleDeg / (180 / Math.PI);
var slope = Math.tan(radians); // m
var perpendicularSlope = -1 / slope;
// y = 2
// y = m * x
// 2 = m * x
this.y0 = 2 / Math.tan(slope) / 2; // 1
// console.log(radians, angle);
this.x0 = 0;
this.x1 = 1;
this.y1 = 0;
break;
}
}
}
}, this);
} else {
this.y0 = 0;
this.y1 = 1;
}
this.colorStops = imageData.args.slice(hasDirection ? 1 : 0).map(function(colorStop) {
var colorStopMatch = colorStop.match(this.stepRegExp);
return {
color: colorStopMatch[1],
stop: colorStopMatch[3] === "%" ? colorStopMatch[2] / 100 : null
};
}, this);
if (this.colorStops[0].stop === null) {
this.colorStops[0].stop = 0;
}
if (this.colorStops[this.colorStops.length - 1].stop === null) {
this.colorStops[this.colorStops.length - 1].stop = 1;
}
this.colorStops.forEach(function(colorStop, index) {
if (colorStop.stop === null) {
this.colorStops.slice(index).some(function(find, count) {
if (find.stop !== null) {
colorStop.stop = ((find.stop - this.colorStops[index - 1].stop) / (count + 1)) + this.colorStops[index - 1].stop;
return true;
} else {
return false;
}
}, this);
}
}, this);
}
LinearGradientContainer.prototype = Object.create(GradientContainer.prototype);
LinearGradientContainer.prototype.stepRegExp = /((?:rgb|rgba)\(\d{1,3},\s\d{1,3},\s\d{1,3}(?:,\s[0-9\.]+)?\))\s*(\d{1,3})?(%|px)?/;
function log() {
if (window.html2canvas.logging && window.console && window.console.log) {
Function.prototype.bind.call(window.console.log, (window.console)).apply(window.console, [(Date.now() - window.html2canvas.start) + "ms", "html2canvas:"].concat([].slice.call(arguments, 0)));
}
}
function NodeContainer(node, parent) {
this.node = node;
this.parent = parent;
this.stack = null;
this.bounds = null;
this.offsetBounds = null;
this.visible = null;
this.computedStyles = null;
this.styles = {};
this.backgroundImages = null;
this.transformData = null;
this.transformMatrix = null;
}
NodeContainer.prototype.assignStack = function(stack) {
this.stack = stack;
stack.children.push(this);
};
NodeContainer.prototype.isElementVisible = function() {
return this.node.nodeType === Node.TEXT_NODE ? this.parent.visible : (
this.css('display') !== "none" &&
this.css('visibility') !== "hidden" &&
!this.node.hasAttribute("data-html2canvas-ignore") &&
(this.node.nodeName !== "INPUT" || this.node.getAttribute("type") !== "hidden")
);
};
NodeContainer.prototype.css = function(attribute) {
if (!this.computedStyles) {
this.computedStyles = this.computedStyle(null);
}
return this.styles[attribute] || (this.styles[attribute] = this.computedStyles[attribute]);
};
NodeContainer.prototype.prefixedCss = function(attribute) {
var prefixes = ["webkit", "moz", "ms", "o"];
var value = this.css(attribute);
if (value === undefined) {
prefixes.some(function(prefix) {
value = this.css(prefix + attribute.substr(0, 1).toUpperCase() + attribute.substr(1));
return value !== undefined;
}, this);
}
return value === undefined ? null : value;
};
NodeContainer.prototype.computedStyle = function(type) {
return this.node.ownerDocument.defaultView.getComputedStyle(this.node, type);
};
NodeContainer.prototype.cssInt = function(attribute) {
var value = parseInt(this.css(attribute), 10);
return (isNaN(value)) ? 0 : value; // borders in old IE are throwing 'medium' for demo.html
};
NodeContainer.prototype.cssFloat = function(attribute) {
var value = parseFloat(this.css(attribute));
return (isNaN(value)) ? 0 : value;
};
NodeContainer.prototype.fontWeight = function() {
var weight = this.css("fontWeight");
switch(parseInt(weight, 10)){
case 401:
weight = "bold";
break;
case 400:
weight = "normal";
break;
}
return weight;
};
NodeContainer.prototype.parseBackgroundImages = function() {
return this.backgroundImages || (this.backgroundImages = parseBackgrounds(this.css("backgroundImage")));
};
NodeContainer.prototype.cssList = function(property, index) {
var value = (this.css(property) || '').split(',');
value = value[index || 0] || value[0] || 'auto';
value = value.trim().split(' ');
if (value.length === 1) {
value = [value[0], value[0]];
}
return value;
};
NodeContainer.prototype.parseBackgroundSize = function(bounds, image, index) {
var size = this.cssList("backgroundSize", index);
var width, height;
if (isPercentage(size[0])) {
width = bounds.width * parseFloat(size[0]) / 100;
} else if (/contain|cover/.test(size[0])) {
var targetRatio = bounds.width / bounds.height, currentRatio = image.width / image.height;
return (targetRatio < currentRatio ^ size[0] === 'contain') ? {width: bounds.height * currentRatio, height: bounds.height} : {width: bounds.width, height: bounds.width / currentRatio};
} else {
width = parseInt(size[0], 10);
}
if (size[0] === 'auto' && size[1] === 'auto') {
height = image.height;
} else if (size[1] === 'auto') {
height = width / image.width * image.height;
} else if (isPercentage(size[1])) {
height = bounds.height * parseFloat(size[1]) / 100;
} else {
height = parseInt(size[1], 10);
}
if (size[0] === 'auto') {
width = height / image.height * image.width;
}
return {width: width, height: height};
};
NodeContainer.prototype.parseBackgroundPosition = function(bounds, image, index, backgroundSize) {
var position = this.cssList('backgroundPosition', index);
var left, top;
if (isPercentage(position[0])){
left = (bounds.width - (backgroundSize || image).width) * (parseFloat(position[0]) / 100);
} else {
left = parseInt(position[0], 10);
}
if (position[1] === 'auto') {
top = left / image.width * image.height;
} else if (isPercentage(position[1])){
top = (bounds.height - (backgroundSize || image).height) * parseFloat(position[1]) / 100;
} else {
top = parseInt(position[1], 10);
}
if (position[0] === 'auto') {
left = top / image.height * image.width;
}
return {left: left, top: top};
};
NodeContainer.prototype.parseBackgroundRepeat = function(index) {
return this.cssList("backgroundRepeat", index)[0];
};
NodeContainer.prototype.parseTextShadows = function() {
var textShadow = this.css("textShadow");
var results = [];
if (textShadow && textShadow !== 'none') {
var shadows = textShadow.match(this.TEXT_SHADOW_PROPERTY);
for (var i = 0; shadows && (i < shadows.length); i++) {
var s = shadows[i].match(this.TEXT_SHADOW_VALUES);
results.push({
color: s[0],
offsetX: s[1] ? s[1].replace('px', '') : 0,
offsetY: s[2] ? s[2].replace('px', '') : 0,
blur: s[3] ? s[3].replace('px', '') : 0
});
}
}
return results;
};
NodeContainer.prototype.parseTransform = function() {
if (!this.transformData) {
if (this.hasTransform()) {
var offset = this.parseBounds();
var origin = this.prefixedCss("transformOrigin").split(" ").map(removePx).map(asFloat);
origin[0] += offset.left;
origin[1] += offset.top;
this.transformData = {
origin: origin,
matrix: this.parseTransformMatrix()
};
} else {
this.transformData = {
origin: [0, 0],
matrix: [1, 0, 0, 1, 0, 0]
};
}
}
return this.transformData;
};
NodeContainer.prototype.parseTransformMatrix = function() {
if (!this.transformMatrix) {
var transform = this.prefixedCss("transform");
var matrix = transform ? parseMatrix(transform.match(this.MATRIX_PROPERTY)) : null;
this.transformMatrix = matrix ? matrix : [1, 0, 0, 1, 0, 0];
}
return this.transformMatrix;
};
NodeContainer.prototype.parseBounds = function() {
return this.bounds || (this.bounds = this.hasTransform() ? offsetBounds(this.node) : getBounds(this.node));
};
NodeContainer.prototype.hasTransform = function() {
return this.parseTransformMatrix().join(",") !== "1,0,0,1,0,0" || (this.parent && this.parent.hasTransform());
};
NodeContainer.prototype.getValue = function() {
var value = this.node.value || "";
value = (this.node.tagName === "SELECT") ? selectionValue(this.node) : value;
return value.length === 0 ? (this.node.placeholder || "") : value;
};
NodeContainer.prototype.MATRIX_PROPERTY = /(matrix)\((.+)\)/;
NodeContainer.prototype.TEXT_SHADOW_PROPERTY = /((rgba|rgb)\([^\)]+\)(\s-?\d+px){0,})/g;
NodeContainer.prototype.TEXT_SHADOW_VALUES = /(-?\d+px)|(#.+)|(rgb\(.+\))|(rgba\(.+\))/g;
function selectionValue(node) {
var option = node.options[node.selectedIndex || 0];
return option ? (option.text || "") : "";
}
function parseMatrix(match) {
if (match && match[1] === "matrix") {
return match[2].split(",").map(function(s) {
return parseFloat(s.trim());
});
}
}
function isPercentage(value) {
return value.toString().indexOf("%") !== -1;
}
function parseBackgrounds(backgroundImage) {
var whitespace = ' \r\n\t',
method, definition, prefix, prefix_i, block, results = [],
mode = 0, numParen = 0, quote, args;
var appendResult = function() {
if(method) {
if (definition.substr(0, 1) === '"') {
definition = definition.substr(1, definition.length - 2);
}
if (definition) {
args.push(definition);
}
if (method.substr(0, 1) === '-' && (prefix_i = method.indexOf('-', 1 ) + 1) > 0) {
prefix = method.substr(0, prefix_i);
method = method.substr(prefix_i);
}
results.push({
prefix: prefix,
method: method.toLowerCase(),
value: block,
args: args,
image: null
});
}
args = [];
method = prefix = definition = block = '';
};
args = [];
method = prefix = definition = block = '';
backgroundImage.split("").forEach(function(c) {
if (mode === 0 && whitespace.indexOf(c) > -1) {
return;
}
switch(c) {
case '"':
if(!quote) {
quote = c;
}
else if(quote === c) {
quote = null;
}
break;
case '(':
if(quote) {
break;
} else if(mode === 0) {
mode = 1;
block += c;
return;
} else {
numParen++;
}
break;
case ')':
if (quote) {
break;
} else if(mode === 1) {
if(numParen === 0) {
mode = 0;
block += c;
appendResult();
return;
} else {
numParen--;
}
}
break;
case ',':
if (quote) {
break;
} else if(mode === 0) {
appendResult();
return;
} else if (mode === 1) {
if (numParen === 0 && !method.match(/^url$/i)) {
args.push(definition);
definition = '';
block += c;
return;
}
}
break;
}
block += c;
if (mode === 0) {
method += c;
} else {
definition += c;
}
});
appendResult();
return results;
}
function removePx(str) {
return str.replace("px", "");
}
function asFloat(str) {
return parseFloat(str);
}
function getBounds(node) {
if (node.getBoundingClientRect) {
var clientRect = node.getBoundingClientRect();
var isBody = node.nodeName === "BODY";
var width = isBody ? node.scrollWidth : (node.offsetWidth == null ? clientRect.width : node.offsetWidth);
return {
top: clientRect.top,
bottom: clientRect.bottom || (clientRect.top + clientRect.height),
right: clientRect.left + width,
left: clientRect.left,
width: width,
height: isBody ? node.scrollHeight : (node.offsetHeight == null ? clientRect.height : node.offsetHeight)
};
}
return {};
}
function offsetBounds(node) {
var parent = node.offsetParent ? offsetBounds(node.offsetParent) : {top: 0, left: 0};
return {
top: node.offsetTop + parent.top,
bottom: node.offsetTop + node.offsetHeight + parent.top,
right: node.offsetLeft + parent.left + node.offsetWidth,
left: node.offsetLeft + parent.left,
width: node.offsetWidth,
height: node.offsetHeight
};
}
function NodeParser(element, renderer, support, imageLoader, options) {
log("Starting NodeParser");
this.renderer = renderer;
this.options = options;
this.range = null;
this.support = support;
this.renderQueue = [];
this.stack = new StackingContext(true, 1, element.ownerDocument, null);
var parent = new NodeContainer(element, null);
if (element !== element.ownerDocument.documentElement && this.renderer.isTransparent(parent.css('backgroundColor'))) {
renderer.rectangle(0, 0, renderer.width, renderer.height, new NodeContainer(element.ownerDocument.documentElement, null).css('backgroundColor'));
}
parent.visibile = parent.isElementVisible();
this.createPseudoHideStyles(element.ownerDocument);
this.nodes = flatten([parent].concat(this.getChildren(parent)).filter(function(container) {
return container.visible = container.isElementVisible();
}).map(this.getPseudoElements, this));
this.fontMetrics = new FontMetrics();
log("Fetched nodes");
this.images = imageLoader.fetch(this.nodes.filter(isElement));
log("Creating stacking contexts");
this.createStackingContexts();
log("Sorting stacking contexts");
this.sortStackingContexts(this.stack);
this.ready = this.images.ready.then(bind(function() {
log("Images loaded, starting parsing");
this.parse(this.stack);
log("Render queue created with " + this.renderQueue.length + " items");
return new Promise(bind(function(resolve) {
if (!options.async) {
this.renderQueue.forEach(this.paint, this);
resolve();
} else if (typeof(options.async) === "function") {
options.async.call(this, this.renderQueue, resolve);
} else {
this.renderIndex = 0;
this.asyncRenderer(this.renderQueue, resolve);
}
}, this));
}, this));
}
NodeParser.prototype.asyncRenderer = function(queue, resolve, asyncTimer) {
asyncTimer = asyncTimer || Date.now();
this.paint(queue[this.renderIndex++]);
if (queue.length === this.renderIndex) {
resolve();
} else if (asyncTimer + 20 > Date.now()) {
this.asyncRenderer(queue, resolve, asyncTimer);
} else {
setTimeout(bind(function() {
this.asyncRenderer(queue, resolve);
}, this), 0);
}
};
NodeParser.prototype.createPseudoHideStyles = function(document) {
var hidePseudoElements = document.createElement('style');
hidePseudoElements.innerHTML = '.' + this.pseudoHideClass + ':before { content: "" !important; display: none !important; }' +
'.' + this.pseudoHideClass + ':after { content: "" !important; display: none !important; }';
document.body.appendChild(hidePseudoElements);
};
NodeParser.prototype.getPseudoElements = function(container) {
var nodes = [[container]];
if (container.node.nodeType === Node.ELEMENT_NODE) {
var before = this.getPseudoElement(container, ":before");
var after = this.getPseudoElement(container, ":after");
if (before) {
container.node.insertBefore(before[0].node, container.node.firstChild);
nodes.push(before);
}
if (after) {
container.node.appendChild(after[0].node);
nodes.push(after);
}
if (before || after) {
container.node.className += " " + this.pseudoHideClass;
}
}
return flatten(nodes);
};
function toCamelCase(str) {
return str.replace(/(\-[a-z])/g, function(match){
return match.toUpperCase().replace('-','');
});
}
NodeParser.prototype.getPseudoElement = function(container, type) {
var style = container.computedStyle(type);
if(!style || !style.content || style.content === "none" || style.content === "-moz-alt-content" || style.display === "none") {
return null;
}
var content = stripQuotes(style.content);
var isImage = content.substr(0, 3) === 'url';
var pseudoNode = document.createElement(isImage ? 'img' : 'html2canvaspseudoelement');
var pseudoContainer = new NodeContainer(pseudoNode, container);
for (var i = style.length-1; i >= 0; i--) {
var property = toCamelCase(style.item(i));
pseudoNode.style[property] = style[property];
}
pseudoNode.className = this.pseudoHideClass;
if (isImage) {
pseudoNode.src = parseBackgrounds(content)[0].args[0];
return [pseudoContainer];
} else {
var text = document.createTextNode(content);
pseudoNode.appendChild(text);
return [pseudoContainer, new TextContainer(text, pseudoContainer)];
}
};
NodeParser.prototype.getChildren = function(parentContainer) {
return flatten([].filter.call(parentContainer.node.childNodes, renderableNode).map(function(node) {
var container = [node.nodeType === Node.TEXT_NODE ? new TextContainer(node, parentContainer) : new NodeContainer(node, parentContainer)].filter(nonIgnoredElement);
return node.nodeType === Node.ELEMENT_NODE && container.length && node.tagName !== "TEXTAREA" ? (container[0].isElementVisible() ? container.concat(this.getChildren(container[0])) : []) : container;
}, this));
};
NodeParser.prototype.newStackingContext = function(container, hasOwnStacking) {
var stack = new StackingContext(hasOwnStacking, container.cssFloat('opacity'), container.node, container.parent);
stack.visible = container.visible;
var parentStack = hasOwnStacking ? stack.getParentStack(this) : stack.parent.stack;
parentStack.contexts.push(stack);
container.stack = stack;
};
NodeParser.prototype.createStackingContexts = function() {
this.nodes.forEach(function(container) {
if (isElement(container) && (this.isRootElement(container) || hasOpacity(container) || isPositionedForStacking(container) || this.isBodyWithTransparentRoot(container) || container.hasTransform())) {
this.newStackingContext(container, true);
} else if (isElement(container) && ((isPositioned(container) && zIndex0(container)) || isInlineBlock(container) || isFloating(container))) {
this.newStackingContext(container, false);
} else {
container.assignStack(container.parent.stack);
}
}, this);
};
NodeParser.prototype.isBodyWithTransparentRoot = function(container) {
return container.node.nodeName === "BODY" && this.renderer.isTransparent(container.parent.css('backgroundColor'));
};
NodeParser.prototype.isRootElement = function(container) {
return container.parent === null;
};
NodeParser.prototype.sortStackingContexts = function(stack) {
stack.contexts.sort(zIndexSort);
stack.contexts.forEach(this.sortStackingContexts, this);
};
NodeParser.prototype.parseTextBounds = function(container) {
return function(text, index, textList) {
if (container.parent.css("textDecoration").substr(0, 4) !== "none" || text.trim().length !== 0) {
if (this.support.rangeBounds && !container.parent.hasTransform()) {
var offset = textList.slice(0, index).join("").length;
return this.getRangeBounds(container.node, offset, text.length);
} else if (container.node && typeof(container.node.data) === "string") {
var replacementNode = container.node.splitText(text.length);
var bounds = this.getWrapperBounds(container.node, container.parent.hasTransform());
container.node = replacementNode;
return bounds;
}
} else if(!this.support.rangeBounds || container.parent.hasTransform()){
container.node = container.node.splitText(text.length);
}
return {};
};
};
NodeParser.prototype.getWrapperBounds = function(node, transform) {
var wrapper = node.ownerDocument.createElement('html2canvaswrapper');
var parent = node.parentNode,
backupText = node.cloneNode(true);
wrapper.appendChild(node.cloneNode(true));
parent.replaceChild(wrapper, node);
var bounds = transform ? offsetBounds(wrapper) : getBounds(wrapper);
parent.replaceChild(backupText, wrapper);
return bounds;
};
NodeParser.prototype.getRangeBounds = function(node, offset, length) {
var range = this.range || (this.range = node.ownerDocument.createRange());
range.setStart(node, offset);
range.setEnd(node, offset + length);
return range.getBoundingClientRect();
};
function ClearTransform() {}
NodeParser.prototype.parse = function(stack) {
// http://www.w3.org/TR/CSS21/visuren.html#z-index
var negativeZindex = stack.contexts.filter(negativeZIndex); // 2. the child stacking contexts with negative stack levels (most negative first).
var descendantElements = stack.children.filter(isElement);
var descendantNonFloats = descendantElements.filter(not(isFloating));
var nonInlineNonPositionedDescendants = descendantNonFloats.filter(not(isPositioned)).filter(not(inlineLevel)); // 3 the in-flow, non-inline-level, non-positioned descendants.
var nonPositionedFloats = descendantElements.filter(not(isPositioned)).filter(isFloating); // 4. the non-positioned floats.
var inFlow = descendantNonFloats.filter(not(isPositioned)).filter(inlineLevel); // 5. the in-flow, inline-level, non-positioned descendants, including inline tables and inline blocks.
var stackLevel0 = stack.contexts.concat(descendantNonFloats.filter(isPositioned)).filter(zIndex0); // 6. the child stacking contexts with stack level 0 and the positioned descendants with stack level 0.
var text = stack.children.filter(isTextNode).filter(hasText);
var positiveZindex = stack.contexts.filter(positiveZIndex); // 7. the child stacking contexts with positive stack levels (least positive first).
negativeZindex.concat(nonInlineNonPositionedDescendants).concat(nonPositionedFloats)
.concat(inFlow).concat(stackLevel0).concat(text).concat(positiveZindex).forEach(function(container) {
this.renderQueue.push(container);
if (isStackingContext(container)) {
this.parse(container);
this.renderQueue.push(new ClearTransform());
}
}, this);
};
NodeParser.prototype.paint = function(container) {
try {
if (container instanceof ClearTransform) {
this.renderer.ctx.restore();
} else if (isTextNode(container)) {
this.paintText(container);
} else {
this.paintNode(container);
}
} catch(e) {
log(e);
}
};
NodeParser.prototype.paintNode = function(container) {
if (isStackingContext(container)) {
this.renderer.setOpacity(container.opacity);
this.renderer.ctx.save();
if (container.hasTransform()) {
this.renderer.setTransform(container.parseTransform());
}
}
var bounds = container.parseBounds();
var borderData = this.parseBorders(container);
this.renderer.clip(borderData.clip, function() {
this.renderer.renderBackground(container, bounds, borderData.borders.map(getWidth));
}, this);
this.renderer.renderBorders(borderData.borders);
switch(container.node.nodeName) {
case "svg":
case "IFRAME":
var imgContainer = this.images.get(container.node);
if (imgContainer) {
this.renderer.renderImage(container, bounds, borderData, imgContainer);
} else {
log("Error loading <" + container.node.nodeName + ">", container.node);
}
break;
case "IMG":
var imageContainer = this.images.get(container.node.src);
if (imageContainer) {
this.renderer.renderImage(container, bounds, borderData, imageContainer);
} else {
log("Error loading <img>", container.node.src);
}
break;
case "SELECT":
case "INPUT":
case "TEXTAREA":
this.paintFormValue(container);
break;
}
};
NodeParser.prototype.paintFormValue = function(container) {
if (container.getValue().length > 0) {
var document = container.node.ownerDocument;
var wrapper = document.createElement('html2canvaswrapper');
var properties = ['lineHeight', 'textAlign', 'fontFamily', 'fontWeight', 'fontSize', 'color',
'paddingLeft', 'paddingTop', 'paddingRight', 'paddingBottom',
'width', 'height', 'borderLeftStyle', 'borderTopStyle', 'borderLeftWidth', 'borderTopWidth',
'boxSizing', 'whiteSpace', 'wordWrap'];
properties.forEach(function(property) {
try {
wrapper.style[property] = container.css(property);
} catch(e) {
// Older IE has issues with "border"
log("html2canvas: Parse: Exception caught in renderFormValue: " + e.message);
}
});
var bounds = container.parseBounds();
wrapper.style.position = "absolute";
wrapper.style.left = bounds.left + "px";
wrapper.style.top = bounds.top + "px";
wrapper.textContent = container.getValue();
document.body.appendChild(wrapper);
this.paintText(new TextContainer(wrapper.firstChild, container));
document.body.removeChild(wrapper);
}
};
NodeParser.prototype.paintText = function(container) {
container.applyTextTransform();
var characters = window.html2canvas.punycode.ucs2.decode(container.node.data);
var textList = (!this.options.letterRendering || noLetterSpacing(container)) && !hasUnicode(container.node.data) ? getWords(characters) : characters.map(function(character) {
return window.html2canvas.punycode.ucs2.encode([character]);
});
var weight = container.parent.fontWeight();
var size = container.parent.css('fontSize');
var family = container.parent.css('fontFamily');
var shadows = container.parent.parseTextShadows();
this.renderer.font(container.parent.css('color'), container.parent.css('fontStyle'), container.parent.css('fontVariant'), weight, size, family);
if (shadows.length) {
// TODO: support multiple text shadows
this.renderer.fontShadow(shadows[0].color, shadows[0].offsetX, shadows[0].offsetY, shadows[0].blur);
} else {
this.renderer.clearShadow();
}
textList.map(this.parseTextBounds(container), this).forEach(function(bounds, index) {
if (bounds) {
this.renderer.text(textList[index], bounds.left, bounds.bottom);
this.renderTextDecoration(container.parent, bounds, this.fontMetrics.getMetrics(family, size));
}
}, this);
};
NodeParser.prototype.renderTextDecoration = function(container, bounds, metrics) {
switch(container.css("textDecoration").split(" ")[0]) {
case "underline":
// Draws a line at the baseline of the font
// TODO As some browsers display the line as more than 1px if the font-size is big, need to take that into account both in position and size
this.renderer.rectangle(bounds.left, Math.round(bounds.top + metrics.baseline + metrics.lineWidth), bounds.width, 1, container.css("color"));
break;
case "overline":
this.renderer.rectangle(bounds.left, Math.round(bounds.top), bounds.width, 1, container.css("color"));
break;
case "line-through":
// TODO try and find exact position for line-through
this.renderer.rectangle(bounds.left, Math.ceil(bounds.top + metrics.middle + metrics.lineWidth), bounds.width, 1, container.css("color"));
break;
}
};
NodeParser.prototype.parseBorders = function(container) {
var nodeBounds = container.bounds;
var radius = getBorderRadiusData(container);
var borders = ["Top", "Right", "Bottom", "Left"].map(function(side) {
return {
width: container.cssInt('border' + side + 'Width'),
color: container.css('border' + side + 'Color'),
args: null
};
});
var borderPoints = calculateCurvePoints(nodeBounds, radius, borders);
return {
clip: this.parseBackgroundClip(container, borderPoints, borders, radius, nodeBounds),
borders: borders.map(function(border, borderSide) {
if (border.width > 0) {
var bx = nodeBounds.left;
var by = nodeBounds.top;
var bw = nodeBounds.width;
var bh = nodeBounds.height - (borders[2].width);
switch(borderSide) {
case 0:
// top border
bh = borders[0].width;
border.args = drawSide({
c1: [bx, by],
c2: [bx + bw, by],
c3: [bx + bw - borders[1].width, by + bh],
c4: [bx + borders[3].width, by + bh]
}, radius[0], radius[1],
borderPoints.topLeftOuter, borderPoints.topLeftInner, borderPoints.topRightOuter, borderPoints.topRightInner);
break;
case 1:
// right border
bx = nodeBounds.left + nodeBounds.width - (borders[1].width);
bw = borders[1].width;
border.args = drawSide({
c1: [bx + bw, by],
c2: [bx + bw, by + bh + borders[2].width],
c3: [bx, by + bh],
c4: [bx, by + borders[0].width]
}, radius[1], radius[2],
borderPoints.topRightOuter, borderPoints.topRightInner, borderPoints.bottomRightOuter, borderPoints.bottomRightInner);
break;
case 2:
// bottom border
by = (by + nodeBounds.height) - (borders[2].width);
bh = borders[2].width;
border.args = drawSide({
c1: [bx + bw, by + bh],
c2: [bx, by + bh],
c3: [bx + borders[3].width, by],
c4: [bx + bw - borders[3].width, by]
}, radius[2], radius[3],
borderPoints.bottomRightOuter, borderPoints.bottomRightInner, borderPoints.bottomLeftOuter, borderPoints.bottomLeftInner);
break;
case 3:
// left border
bw = borders[3].width;
border.args = drawSide({
c1: [bx, by + bh + borders[2].width],
c2: [bx, by],
c3: [bx + bw, by + borders[0].width],
c4: [bx + bw, by + bh]
}, radius[3], radius[0],
borderPoints.bottomLeftOuter, borderPoints.bottomLeftInner, borderPoints.topLeftOuter, borderPoints.topLeftInner);
break;
}
}
return border;
})
};
};
NodeParser.prototype.parseBackgroundClip = function(container, borderPoints, borders, radius, bounds) {
var backgroundClip = container.css('backgroundClip'),
borderArgs = [];
switch(backgroundClip) {
case "content-box":
case "padding-box":
parseCorner(borderArgs, radius[0], radius[1], borderPoints.topLeftInner, borderPoints.topRightInner, bounds.left + borders[3].width, bounds.top + borders[0].width);
parseCorner(borderArgs, radius[1], radius[2], borderPoints.topRightInner, borderPoints.bottomRightInner, bounds.left + bounds.width - borders[1].width, bounds.top + borders[0].width);
parseCorner(borderArgs, radius[2], radius[3], borderPoints.bottomRightInner, borderPoints.bottomLeftInner, bounds.left + bounds.width - borders[1].width, bounds.top + bounds.height - borders[2].width);
parseCorner(borderArgs, radius[3], radius[0], borderPoints.bottomLeftInner, borderPoints.topLeftInner, bounds.left + borders[3].width, bounds.top + bounds.height - borders[2].width);
break;
default:
parseCorner(borderArgs, radius[0], radius[1], borderPoints.topLeftOuter, borderPoints.topRightOuter, bounds.left, bounds.top);
parseCorner(borderArgs, radius[1], radius[2], borderPoints.topRightOuter, borderPoints.bottomRightOuter, bounds.left + bounds.width, bounds.top);
parseCorner(borderArgs, radius[2], radius[3], borderPoints.bottomRightOuter, borderPoints.bottomLeftOuter, bounds.left + bounds.width, bounds.top + bounds.height);
parseCorner(borderArgs, radius[3], radius[0], borderPoints.bottomLeftOuter, borderPoints.topLeftOuter, bounds.left, bounds.top + bounds.height);
break;
}
return borderArgs;
};
NodeParser.prototype.pseudoHideClass = "___html2canvas___pseudoelement";
function getCurvePoints(x, y, r1, r2) {
var kappa = 4 * ((Math.sqrt(2) - 1) / 3);
var ox = (r1) * kappa, // control point offset horizontal
oy = (r2) * kappa, // control point offset vertical
xm = x + r1, // x-middle
ym = y + r2; // y-middle
return {
topLeft: bezierCurve({x: x, y: ym}, {x: x, y: ym - oy}, {x: xm - ox, y: y}, {x: xm, y: y}),
topRight: bezierCurve({x: x, y: y}, {x: x + ox,y: y}, {x: xm, y: ym - oy}, {x: xm, y: ym}),
bottomRight: bezierCurve({x: xm, y: y}, {x: xm, y: y + oy}, {x: x + ox, y: ym}, {x: x, y: ym}),
bottomLeft: bezierCurve({x: xm, y: ym}, {x: xm - ox, y: ym}, {x: x, y: y + oy}, {x: x, y:y})
};
}
function calculateCurvePoints(bounds, borderRadius, borders) {
var x = bounds.left,
y = bounds.top,
width = bounds.width,
height = bounds.height,
tlh = borderRadius[0][0],
tlv = borderRadius[0][1],
trh = borderRadius[1][0],
trv = borderRadius[1][1],
brh = borderRadius[2][0],
brv = borderRadius[2][1],
blh = borderRadius[3][0],
blv = borderRadius[3][1];
var topWidth = width - trh,
rightHeight = height - brv,
bottomWidth = width - brh,
leftHeight = height - blv;
return {
topLeftOuter: getCurvePoints(x, y, tlh, tlv).topLeft.subdivide(0.5),
topLeftInner: getCurvePoints(x + borders[3].width, y + borders[0].width, Math.max(0, tlh - borders[3].width), Math.max(0, tlv - borders[0].width)).topLeft.subdivide(0.5),
topRightOuter: getCurvePoints(x + topWidth, y, trh, trv).topRight.subdivide(0.5),
topRightInner: getCurvePoints(x + Math.min(topWidth, width + borders[3].width), y + borders[0].width, (topWidth > width + borders[3].width) ? 0 :trh - borders[3].width, trv - borders[0].width).topRight.subdivide(0.5),
bottomRightOuter: getCurvePoints(x + bottomWidth, y + rightHeight, brh, brv).bottomRight.subdivide(0.5),
bottomRightInner: getCurvePoints(x + Math.min(bottomWidth, width + borders[3].width), y + Math.min(rightHeight, height + borders[0].width), Math.max(0, brh - borders[1].width), Math.max(0, brv - borders[2].width)).bottomRight.subdivide(0.5),
bottomLeftOuter: getCurvePoints(x, y + leftHeight, blh, blv).bottomLeft.subdivide(0.5),
bottomLeftInner: getCurvePoints(x + borders[3].width, y + leftHeight, Math.max(0, blh - borders[3].width), Math.max(0, blv - borders[2].width)).bottomLeft.subdivide(0.5)
};
}
function bezierCurve(start, startControl, endControl, end) {
var lerp = function (a, b, t) {
return {
x: a.x + (b.x - a.x) * t,
y: a.y + (b.y - a.y) * t
};
};
return {
start: start,
startControl: startControl,
endControl: endControl,
end: end,
subdivide: function(t) {
var ab = lerp(start, startControl, t),
bc = lerp(startControl, endControl, t),
cd = lerp(endControl, end, t),
abbc = lerp(ab, bc, t),
bccd = lerp(bc, cd, t),
dest = lerp(abbc, bccd, t);
return [bezierCurve(start, ab, abbc, dest), bezierCurve(dest, bccd, cd, end)];
},
curveTo: function(borderArgs) {
borderArgs.push(["bezierCurve", startControl.x, startControl.y, endControl.x, endControl.y, end.x, end.y]);
},
curveToReversed: function(borderArgs) {
borderArgs.push(["bezierCurve", endControl.x, endControl.y, startControl.x, startControl.y, start.x, start.y]);
}
};
}
function drawSide(borderData, radius1, radius2, outer1, inner1, outer2, inner2) {
var borderArgs = [];
if (radius1[0] > 0 || radius1[1] > 0) {
borderArgs.push(["line", outer1[1].start.x, outer1[1].start.y]);
outer1[1].curveTo(borderArgs);
} else {
borderArgs.push([ "line", borderData.c1[0], borderData.c1[1]]);
}
if (radius2[0] > 0 || radius2[1] > 0) {
borderArgs.push(["line", outer2[0].start.x, outer2[0].start.y]);
outer2[0].curveTo(borderArgs);
borderArgs.push(["line", inner2[0].end.x, inner2[0].end.y]);
inner2[0].curveToReversed(borderArgs);
} else {
borderArgs.push(["line", borderData.c2[0], borderData.c2[1]]);
borderArgs.push(["line", borderData.c3[0], borderData.c3[1]]);
}
if (radius1[0] > 0 || radius1[1] > 0) {
borderArgs.push(["line", inner1[1].end.x, inner1[1].end.y]);
inner1[1].curveToReversed(borderArgs);
} else {
borderArgs.push(["line", borderData.c4[0], borderData.c4[1]]);
}
return borderArgs;
}
function parseCorner(borderArgs, radius1, radius2, corner1, corner2, x, y) {
if (radius1[0] > 0 || radius1[1] > 0) {
borderArgs.push(["line", corner1[0].start.x, corner1[0].start.y]);
corner1[0].curveTo(borderArgs);
corner1[1].curveTo(borderArgs);
} else {
borderArgs.push(["line", x, y]);
}
if (radius2[0] > 0 || radius2[1] > 0) {
borderArgs.push(["line", corner2[0].start.x, corner2[0].start.y]);
}
}
function negativeZIndex(container) {
return container.cssInt("zIndex") < 0;
}
function positiveZIndex(container) {
return container.cssInt("zIndex") > 0;
}
function zIndex0(container) {
return container.cssInt("zIndex") === 0;
}
function inlineLevel(container) {
return ["inline", "inline-block", "inline-table"].indexOf(container.css("display")) !== -1;
}
function isStackingContext(container) {
return (container instanceof StackingContext);
}
function hasText(container) {
return container.node.data.trim().length > 0;
}
function noLetterSpacing(container) {
return (/^(normal|none|0px)$/.test(container.parent.css("letterSpacing")));
}
function getBorderRadiusData(container) {
return ["TopLeft", "TopRight", "BottomRight", "BottomLeft"].map(function(side) {
var value = container.css('border' + side + 'Radius');
var arr = value.split(" ");
if (arr.length <= 1) {
arr[1] = arr[0];
}
return arr.map(asInt);
});
}
function renderableNode(node) {
return (node.nodeType === Node.TEXT_NODE || node.nodeType === Node.ELEMENT_NODE);
}
function isPositionedForStacking(container) {
var position = container.css("position");
var zIndex = (position === "absolute" || position === "relative") ? container.css("zIndex") : "auto";
return zIndex !== "auto";
}
function isPositioned(container) {
return container.css("position") !== "static";
}
function isFloating(container) {
return container.css("float") !== "none";
}
function isInlineBlock(container) {
return ["inline-block", "inline-table"].indexOf(container.css("display")) !== -1;
}
function not(callback) {
var context = this;
return function() {
return !callback.apply(context, arguments);
};
}
function isElement(container) {
return container.node.nodeType === Node.ELEMENT_NODE;
}
function isTextNode(container) {
return container.node.nodeType === Node.TEXT_NODE;
}
function zIndexSort(a, b) {
return a.cssInt("zIndex") - b.cssInt("zIndex");
}
function hasOpacity(container) {
return container.css("opacity") < 1;
}
function bind(callback, context) {
return function() {
return callback.apply(context, arguments);
};
}
function asInt(value) {
return parseInt(value, 10);
}
function getWidth(border) {
return border.width;
}
function nonIgnoredElement(nodeContainer) {
return (nodeContainer.node.nodeType !== Node.ELEMENT_NODE || ["SCRIPT", "HEAD", "TITLE", "OBJECT", "BR", "OPTION"].indexOf(nodeContainer.node.nodeName) === -1);
}
function flatten(arrays) {
return [].concat.apply([], arrays);
}
function stripQuotes(content) {
var first = content.substr(0, 1);
return (first === content.substr(content.length - 1) && first.match(/'|"/)) ? content.substr(1, content.length - 2) : content;
}
function getWords(characters) {
var words = [], i = 0, onWordBoundary = false, word;
while(characters.length) {
if (isWordBoundary(characters[i]) === onWordBoundary) {
word = characters.splice(0, i);
if (word.length) {
words.push(window.html2canvas.punycode.ucs2.encode(word));
}
onWordBoundary =! onWordBoundary;
i = 0;
} else {
i++;
}
if (i >= characters.length) {
word = characters.splice(0, i);
if (word.length) {
words.push(window.html2canvas.punycode.ucs2.encode(word));
}
}
}
return words;
}
function isWordBoundary(characterCode) {
return [
32, // <space>
13, // \r
10, // \n
9, // \t
45 // -
].indexOf(characterCode) !== -1;
}
function hasUnicode(string) {
return /[^\u0000-\u00ff]/.test(string);
}
function ProxyImageContainer(src, proxy) {
var callbackName = "html2canvas_" + proxyImageCount++;
var script = document.createElement("script");
var link = document.createElement("a");
link.href = src;
src = link.href;
var requestUrl = proxy + ((proxy.indexOf("?") > -1) ? "&" : "?" ) + 'url=' + encodeURIComponent(src) + '&callback=' + callbackName;
this.src = src;
this.image = new Image();
var self = this;
this.promise = new Promise(function(resolve, reject) {
self.image.onload = resolve;
self.image.onerror = reject;
window[callbackName] = function(a){
if (a.substring(0,6) === "error:"){
reject();
} else {
self.image.src = a;
}
window[callbackName] = undefined; // to work with IE<9 // NOTE: that the undefined callback property-name still exists on the window object (for IE<9)
try {
delete window[callbackName]; // for all browser that support this
} catch(ex) {}
script.parentNode.removeChild(script);
};
script.setAttribute("type", "text/javascript");
script.setAttribute("src", requestUrl);
document.body.appendChild(script);
})['catch'](function() {
var dummy = new DummyImageContainer(src);
return dummy.promise.then(function(image) {
self.image = image;
});
});
}
var proxyImageCount = 0;
function Renderer(width, height, images, options, document) {
this.width = width;
this.height = height;
this.images = images;
this.options = options;
this.document = document;
}
Renderer.prototype.renderImage = function(container, bounds, borderData, imageContainer) {
var paddingLeft = container.cssInt('paddingLeft'),
paddingTop = container.cssInt('paddingTop'),
paddingRight = container.cssInt('paddingRight'),
paddingBottom = container.cssInt('paddingBottom'),
borders = borderData.borders;
var width = bounds.width - (borders[1].width + borders[3].width + paddingLeft + paddingRight);
var height = bounds.height - (borders[0].width + borders[2].width + paddingTop + paddingBottom);
this.drawImage(
imageContainer,
0,
0,
imageContainer.image.width || width,
imageContainer.image.height || height,
bounds.left + paddingLeft + borders[3].width,
bounds.top + paddingTop + borders[0].width,
width,
height
);
};
Renderer.prototype.renderBackground = function(container, bounds, borderData) {
if (bounds.height > 0 && bounds.width > 0) {
this.renderBackgroundColor(container, bounds);
this.renderBackgroundImage(container, bounds, borderData);
}
};
Renderer.prototype.renderBackgroundColor = function(container, bounds) {
var color = container.css("backgroundColor");
if (!this.isTransparent(color)) {
this.rectangle(bounds.left, bounds.top, bounds.width, bounds.height, container.css("backgroundColor"));
}
};
Renderer.prototype.renderBorders = function(borders) {
borders.forEach(this.renderBorder, this);
};
Renderer.prototype.renderBorder = function(data) {
if (!this.isTransparent(data.color) && data.args !== null) {
this.drawShape(data.args, data.color);
}
};
Renderer.prototype.renderBackgroundImage = function(container, bounds, borderData) {
var backgroundImages = container.parseBackgroundImages();
backgroundImages.reverse().forEach(function(backgroundImage, index, arr) {
switch(backgroundImage.method) {
case "url":
var image = this.images.get(backgroundImage.args[0]);
if (image) {
this.renderBackgroundRepeating(container, bounds, image, arr.length - (index+1), borderData);
} else {
log("Error loading background-image", backgroundImage.args[0]);
}
break;
case "linear-gradient":
case "gradient":
var gradientImage = this.images.get(backgroundImage.value);
if (gradientImage) {
this.renderBackgroundGradient(gradientImage, bounds, borderData);
} else {
log("Error loading background-image", backgroundImage.args[0]);
}
break;
case "none":
break;
default:
log("Unknown background-image type", backgroundImage.args[0]);
}
}, this);
};
Renderer.prototype.renderBackgroundRepeating = function(container, bounds, imageContainer, index, borderData) {
var size = container.parseBackgroundSize(bounds, imageContainer.image, index);
var position = container.parseBackgroundPosition(bounds, imageContainer.image, index, size);
var repeat = container.parseBackgroundRepeat(index);
switch (repeat) {
case "repeat-x":
case "repeat no-repeat":
this.backgroundRepeatShape(imageContainer, position, size, bounds, bounds.left + borderData[3], bounds.top + position.top + borderData[0], 99999, imageContainer.image.height, borderData);
break;
case "repeat-y":
case "no-repeat repeat":
this.backgroundRepeatShape(imageContainer, position, size, bounds, bounds.left + position.left + borderData[3], bounds.top + borderData[0], imageContainer.image.width, 99999, borderData);
break;
case "no-repeat":
this.backgroundRepeatShape(imageContainer, position, size, bounds, bounds.left + position.left + borderData[3], bounds.top + position.top + borderData[0], imageContainer.image.width, imageContainer.image.height, borderData);
break;
default:
this.renderBackgroundRepeat(imageContainer, position, size, {top: bounds.top, left: bounds.left}, borderData[3], borderData[0]);
break;
}
};
Renderer.prototype.isTransparent = function(color) {
return (!color || color === "transparent" || color === "rgba(0, 0, 0, 0)");
};
function StackingContext(hasOwnStacking, opacity, element, parent) {
NodeContainer.call(this, element, parent);
this.ownStacking = hasOwnStacking;
this.contexts = [];
this.children = [];
this.opacity = (this.parent ? this.parent.stack.opacity : 1) * opacity;
}
StackingContext.prototype = Object.create(NodeContainer.prototype);
StackingContext.prototype.getParentStack = function(context) {
var parentStack = (this.parent) ? this.parent.stack : null;
return parentStack ? (parentStack.ownStacking ? parentStack : parentStack.getParentStack(context)) : context.stack;
};
function Support(document) {
this.rangeBounds = this.testRangeBounds(document);
this.cors = this.testCORS();
this.svg = this.testSVG();
}
Support.prototype.testRangeBounds = function(document) {
var range, testElement, rangeBounds, rangeHeight, support = false;
if (document.createRange) {
range = document.createRange();
if (range.getBoundingClientRect) {
testElement = document.createElement('boundtest');
testElement.style.height = "123px";
testElement.style.display = "block";
document.body.appendChild(testElement);
range.selectNode(testElement);
rangeBounds = range.getBoundingClientRect();
rangeHeight = rangeBounds.height;
if (rangeHeight === 123) {
support = true;
}
document.body.removeChild(testElement);
}
}
return support;
};
Support.prototype.testCORS = function() {
return typeof((new Image()).crossOrigin) !== "undefined";
};
Support.prototype.testSVG = function() {
var img = new Image();
var canvas = document.createElement("canvas");
var ctx = canvas.getContext("2d");
img.src = "data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg'></svg>";
try {
ctx.drawImage(img, 0, 0);
canvas.toDataURL();
} catch(e) {
return false;
}
return true;
};
function SVGContainer(src) {
this.src = src;
this.image = null;
var self = this;
this.promise = this.hasFabric().then(function() {
return (self.isInline(src) ? Promise.resolve(self.inlineFormatting(src)) : XHR(src));
}).then(function(svg) {
return new Promise(function(resolve) {
html2canvas.fabric.loadSVGFromString(svg, self.createCanvas.call(self, resolve));
});
});
}
SVGContainer.prototype.hasFabric = function() {
return !html2canvas.fabric ? Promise.reject(new Error("html2canvas.svg.js is not loaded, cannot render svg")) : Promise.resolve();
};
SVGContainer.prototype.inlineFormatting = function(src) {
return (/^data:image\/svg\+xml;base64,/.test(src)) ? this.decode64(this.removeContentType(src)) : this.removeContentType(src);
};
SVGContainer.prototype.removeContentType = function(src) {
return src.replace(/^data:image\/svg\+xml(;base64)?,/,'');
};
SVGContainer.prototype.isInline = function(src) {
return (/^data:image\/svg\+xml/i.test(src));
};
SVGContainer.prototype.createCanvas = function(resolve) {
var self = this;
return function (objects, options) {
var canvas = new html2canvas.fabric.StaticCanvas('c');
self.image = canvas.lowerCanvasEl;
canvas
.setWidth(options.width)
.setHeight(options.height)
.add(html2canvas.fabric.util.groupSVGElements(objects, options))
.renderAll();
resolve(canvas.lowerCanvasEl);
};
};
SVGContainer.prototype.decode64 = function(str) {
return (typeof(window.atob) === "function") ? window.atob(str) : decode64(str);
};
/*
* base64-arraybuffer
* https://github.com/niklasvh/base64-arraybuffer
*
* Copyright (c) 2012 Niklas von Hertzen
* Licensed under the MIT license.
*/
function decode64(base64) {
var chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
var len = base64.length, i, encoded1, encoded2, encoded3, encoded4, byte1, byte2, byte3;
var output = "";
for (i = 0; i < len; i+=4) {
encoded1 = chars.indexOf(base64[i]);
encoded2 = chars.indexOf(base64[i+1]);
encoded3 = chars.indexOf(base64[i+2]);
encoded4 = chars.indexOf(base64[i+3]);
byte1 = (encoded1 << 2) | (encoded2 >> 4);
byte2 = ((encoded2 & 15) << 4) | (encoded3 >> 2);
byte3 = ((encoded3 & 3) << 6) | encoded4;
if (encoded3 === 64) {
output += String.fromCharCode(byte1);
} else if (encoded4 === 64 || encoded4 === -1) {
output += String.fromCharCode(byte1, byte2);
} else{
output += String.fromCharCode(byte1, byte2, byte3);
}
}
return output;
}
function SVGNodeContainer(node) {
this.src = node;
this.image = null;
var self = this;
this.promise = this.hasFabric().then(function() {
return new Promise(function(resolve) {
html2canvas.fabric.parseSVGDocument(node, self.createCanvas.call(self, resolve));
});
});
}
SVGNodeContainer.prototype = Object.create(SVGContainer.prototype);
function TextContainer(node, parent) {
NodeContainer.call(this, node, parent);
}
TextContainer.prototype = Object.create(NodeContainer.prototype);
TextContainer.prototype.applyTextTransform = function() {
this.node.data = this.transform(this.parent.css("textTransform"));
};
TextContainer.prototype.transform = function(transform) {
var text = this.node.data;
switch(transform){
case "lowercase":
return text.toLowerCase();
case "capitalize":
return text.replace(/(^|\s|:|-|\(|\))([a-z])/g, capitalize);
case "uppercase":
return text.toUpperCase();
default:
return text;
}
};
function capitalize(m, p1, p2) {
if (m.length > 0) {
return p1 + p2.toUpperCase();
}
}
function WebkitGradientContainer(imageData) {
GradientContainer.apply(this, arguments);
this.type = (imageData.args[0] === "linear") ? this.TYPES.LINEAR : this.TYPES.RADIAL;
}
WebkitGradientContainer.prototype = Object.create(GradientContainer.prototype);
function XHR(url) {
return new Promise(function(resolve, reject) {
var xhr = new XMLHttpRequest();
xhr.open('GET', url);
xhr.onload = function() {
if (xhr.status === 200) {
resolve(xhr.responseText);
} else {
reject(new Error(xhr.statusText));
}
};
xhr.onerror = function() {
reject(new Error("Network Error"));
};
xhr.send();
});
}
function CanvasRenderer(width, height) {
Renderer.apply(this, arguments);
this.canvas = this.document.createElement("canvas");
this.canvas.width = width;
this.canvas.height = height;
this.ctx = this.canvas.getContext("2d");
this.taintCtx = this.document.createElement("canvas").getContext("2d");
this.ctx.textBaseline = "bottom";
this.variables = {};
log("Initialized CanvasRenderer");
}
CanvasRenderer.prototype = Object.create(Renderer.prototype);
CanvasRenderer.prototype.setFillStyle = function(color) {
this.ctx.fillStyle = color;
return this.ctx;
};
CanvasRenderer.prototype.rectangle = function(left, top, width, height, color) {
this.setFillStyle(color).fillRect(left, top, width, height);
};
CanvasRenderer.prototype.drawShape = function(shape, color) {
this.shape(shape);
this.setFillStyle(color).fill();
};
CanvasRenderer.prototype.taints = function(imageContainer) {
if (imageContainer.tainted === null) {
this.taintCtx.drawImage(imageContainer.image, 0, 0);
try {
this.taintCtx.getImageData(0, 0, 1, 1);
imageContainer.tainted = false;
} catch(e) {
this.taintCtx = document.createElement("canvas").getContext("2d");
imageContainer.tainted = true;
}
}
return imageContainer.tainted;
};
CanvasRenderer.prototype.drawImage = function(imageContainer, sx, sy, sw, sh, dx, dy, dw, dh) {
if (!this.taints(imageContainer) || this.options.allowTaint) {
this.ctx.drawImage(imageContainer.image, sx, sy, sw, sh, dx, dy, dw, dh);
}
};
CanvasRenderer.prototype.clip = function(shape, callback, context) {
this.ctx.save();
this.shape(shape).clip();
callback.call(context);
this.ctx.restore();
};
CanvasRenderer.prototype.shape = function(shape) {
this.ctx.beginPath();
shape.forEach(function(point, index) {
this.ctx[(index === 0) ? "moveTo" : point[0] + "To" ].apply(this.ctx, point.slice(1));
}, this);
this.ctx.closePath();
return this.ctx;
};
CanvasRenderer.prototype.font = function(color, style, variant, weight, size, family) {
this.setFillStyle(color).font = [style, variant, weight, size, family].join(" ");
};
CanvasRenderer.prototype.fontShadow = function(color, offsetX, offsetY, blur) {
this.setVariable("shadowColor", color)
.setVariable("shadowOffsetY", offsetX)
.setVariable("shadowOffsetX", offsetY)
.setVariable("shadowBlur", blur);
};
CanvasRenderer.prototype.clearShadow = function() {
this.setVariable("shadowColor", "rgba(0,0,0,0)");
};
CanvasRenderer.prototype.setOpacity = function(opacity) {
this.ctx.globalAlpha = opacity;
};
CanvasRenderer.prototype.setTransform = function(transform) {
this.ctx.translate(transform.origin[0], transform.origin[1]);
this.ctx.transform.apply(this.ctx, transform.matrix);
this.ctx.translate(-transform.origin[0], -transform.origin[1]);
};
CanvasRenderer.prototype.setVariable = function(property, value) {
if (this.variables[property] !== value) {
this.variables[property] = this.ctx[property] = value;
}
return this;
};
CanvasRenderer.prototype.text = function(text, left, bottom) {
this.ctx.fillText(text, left, bottom);
};
CanvasRenderer.prototype.backgroundRepeatShape = function(imageContainer, backgroundPosition, size, bounds, left, top, width, height, borderData) {
var shape = [
["line", Math.round(left), Math.round(top)],
["line", Math.round(left + width), Math.round(top)],
["line", Math.round(left + width), Math.round(height + top)],
["line", Math.round(left), Math.round(height + top)]
];
this.clip(shape, function() {
this.renderBackgroundRepeat(imageContainer, backgroundPosition, size, bounds, borderData[3], borderData[0]);
}, this);
};
CanvasRenderer.prototype.renderBackgroundRepeat = function(imageContainer, backgroundPosition, size, bounds, borderLeft, borderTop) {
var offsetX = Math.round(bounds.left + backgroundPosition.left + borderLeft), offsetY = Math.round(bounds.top + backgroundPosition.top + borderTop);
this.setFillStyle(this.ctx.createPattern(this.resizeImage(imageContainer, size), "repeat"));
this.ctx.translate(offsetX, offsetY);
this.ctx.fill();
this.ctx.translate(-offsetX, -offsetY);
};
CanvasRenderer.prototype.renderBackgroundGradient = function(gradientImage, bounds) {
if (gradientImage instanceof LinearGradientContainer) {
var gradient = this.ctx.createLinearGradient(
bounds.left + bounds.width * gradientImage.x0,
bounds.top + bounds.height * gradientImage.y0,
bounds.left + bounds.width * gradientImage.x1,
bounds.top + bounds.height * gradientImage.y1);
gradientImage.colorStops.forEach(function(colorStop) {
gradient.addColorStop(colorStop.stop, colorStop.color);
});
this.rectangle(bounds.left, bounds.top, bounds.width, bounds.height, gradient);
}
};
CanvasRenderer.prototype.resizeImage = function(imageContainer, size) {
var image = imageContainer.image;
if(image.width === size.width && image.height === size.height) {
return image;
}
var ctx, canvas = document.createElement('canvas');
canvas.width = size.width;
canvas.height = size.height;
ctx = canvas.getContext("2d");
ctx.drawImage(image, 0, 0, image.width, image.height, 0, 0, size.width, size.height );
return canvas;
};
})(window, document);