Файл: concrete5.7.5.6/concrete/js/build/vendor/jquery-fileupload/load-image.js
Строк: 303
<?php
/*
* JavaScript Load Image 1.10.0
* https://github.com/blueimp/JavaScript-Load-Image
*
* Copyright 2011, Sebastian Tschan
* https://blueimp.net
*
* Licensed under the MIT license:
* http://www.opensource.org/licenses/MIT
*/
/*jslint nomen: true */
/*global define, window, document, URL, webkitURL, Blob, File, FileReader */
(function ($) {
'use strict';
// Loads an image for a given File object.
// Invokes the callback with an img or optional canvas
// element (if supported by the browser) as parameter:
var loadImage = function (file, callback, options) {
var img = document.createElement('img'),
url,
oUrl;
img.onerror = callback;
img.onload = function () {
if (oUrl && !(options && options.noRevoke)) {
loadImage.revokeObjectURL(oUrl);
}
if (callback) {
callback(loadImage.scale(img, options));
}
};
if (loadImage.isInstanceOf('Blob', file) ||
// Files are also Blob instances, but some browsers
// (Firefox 3.6) support the File API but not Blobs:
loadImage.isInstanceOf('File', file)) {
url = oUrl = loadImage.createObjectURL(file);
// Store the file type for resize processing:
img._type = file.type;
} else if (typeof file === 'string') {
url = file;
if (options && options.crossOrigin) {
img.crossOrigin = options.crossOrigin;
}
} else {
return false;
}
if (url) {
img.src = url;
return img;
}
return loadImage.readFile(file, function (e) {
var target = e.target;
if (target && target.result) {
img.src = target.result;
} else {
if (callback) {
callback(e);
}
}
});
},
// The check for URL.revokeObjectURL fixes an issue with Opera 12,
// which provides URL.createObjectURL but doesn't properly implement it:
urlAPI = (window.createObjectURL && window) ||
(window.URL && URL.revokeObjectURL && URL) ||
(window.webkitURL && webkitURL);
loadImage.isInstanceOf = function (type, obj) {
// Cross-frame instanceof check
return Object.prototype.toString.call(obj) === '[object ' + type + ']';
};
// Transform image coordinates, allows to override e.g.
// the canvas orientation based on the orientation option,
// gets canvas, options passed as arguments:
loadImage.transformCoordinates = function () {
return;
};
// Returns transformed options, allows to override e.g.
// maxWidth, maxHeight and crop options based on the aspectRatio.
// gets img, options passed as arguments:
loadImage.getTransformedOptions = function (img, options) {
var aspectRatio = options.aspectRatio,
newOptions,
i,
width,
height;
if (!aspectRatio) {
return options;
}
newOptions = {};
for (i in options) {
if (options.hasOwnProperty(i)) {
newOptions[i] = options[i];
}
}
newOptions.crop = true;
width = img.naturalWidth || img.width;
height = img.naturalHeight || img.height;
if (width / height > aspectRatio) {
newOptions.maxWidth = height * aspectRatio;
newOptions.maxHeight = height;
} else {
newOptions.maxWidth = width;
newOptions.maxHeight = width / aspectRatio;
}
return newOptions;
};
// Canvas render method, allows to override the
// rendering e.g. to work around issues on iOS:
loadImage.renderImageToCanvas = function (
canvas,
img,
sourceX,
sourceY,
sourceWidth,
sourceHeight,
destX,
destY,
destWidth,
destHeight
) {
canvas.getContext('2d').drawImage(
img,
sourceX,
sourceY,
sourceWidth,
sourceHeight,
destX,
destY,
destWidth,
destHeight
);
return canvas;
};
// This method is used to determine if the target image
// should be a canvas element:
loadImage.hasCanvasOption = function (options) {
return options.canvas || options.crop || options.aspectRatio;
};
// Scales and/or crops the given image (img or canvas HTML element)
// using the given options.
// Returns a canvas object if the browser supports canvas
// and the hasCanvasOption method returns true or a canvas
// object is passed as image, else the scaled image:
loadImage.scale = function (img, options) {
options = options || {};
var canvas = document.createElement('canvas'),
useCanvas = img.getContext ||
(loadImage.hasCanvasOption(options) && canvas.getContext),
width = img.naturalWidth || img.width,
height = img.naturalHeight || img.height,
destWidth = width,
destHeight = height,
maxWidth,
maxHeight,
minWidth,
minHeight,
sourceWidth,
sourceHeight,
sourceX,
sourceY,
tmp,
scaleUp = function () {
var scale = Math.max(
(minWidth || destWidth) / destWidth,
(minHeight || destHeight) / destHeight
);
if (scale > 1) {
destWidth = destWidth * scale;
destHeight = destHeight * scale;
}
},
scaleDown = function () {
var scale = Math.min(
(maxWidth || destWidth) / destWidth,
(maxHeight || destHeight) / destHeight
);
if (scale < 1) {
destWidth = destWidth * scale;
destHeight = destHeight * scale;
}
};
if (useCanvas) {
options = loadImage.getTransformedOptions(img, options);
sourceX = options.left || 0;
sourceY = options.top || 0;
if (options.sourceWidth) {
sourceWidth = options.sourceWidth;
if (options.right !== undefined && options.left === undefined) {
sourceX = width - sourceWidth - options.right;
}
} else {
sourceWidth = width - sourceX - (options.right || 0);
}
if (options.sourceHeight) {
sourceHeight = options.sourceHeight;
if (options.bottom !== undefined && options.top === undefined) {
sourceY = height - sourceHeight - options.bottom;
}
} else {
sourceHeight = height - sourceY - (options.bottom || 0);
}
destWidth = sourceWidth;
destHeight = sourceHeight;
}
maxWidth = options.maxWidth;
maxHeight = options.maxHeight;
minWidth = options.minWidth;
minHeight = options.minHeight;
if (useCanvas && maxWidth && maxHeight && options.crop) {
destWidth = maxWidth;
destHeight = maxHeight;
tmp = sourceWidth / sourceHeight - maxWidth / maxHeight;
if (tmp < 0) {
sourceHeight = maxHeight * sourceWidth / maxWidth;
if (options.top === undefined && options.bottom === undefined) {
sourceY = (height - sourceHeight) / 2;
}
} else if (tmp > 0) {
sourceWidth = maxWidth * sourceHeight / maxHeight;
if (options.left === undefined && options.right === undefined) {
sourceX = (width - sourceWidth) / 2;
}
}
} else {
if (options.contain || options.cover) {
minWidth = maxWidth = maxWidth || minWidth;
minHeight = maxHeight = maxHeight || minHeight;
}
if (options.cover) {
scaleDown();
scaleUp();
} else {
scaleUp();
scaleDown();
}
}
if (useCanvas) {
canvas.width = destWidth;
canvas.height = destHeight;
loadImage.transformCoordinates(
canvas,
options
);
return loadImage.renderImageToCanvas(
canvas,
img,
sourceX,
sourceY,
sourceWidth,
sourceHeight,
0,
0,
destWidth,
destHeight
);
}
img.width = destWidth;
img.height = destHeight;
return img;
};
loadImage.createObjectURL = function (file) {
return urlAPI ? urlAPI.createObjectURL(file) : false;
};
loadImage.revokeObjectURL = function (url) {
return urlAPI ? urlAPI.revokeObjectURL(url) : false;
};
// Loads a given File object via FileReader interface,
// invokes the callback with the event object (load or error).
// The result can be read via event.target.result:
loadImage.readFile = function (file, callback, method) {
if (window.FileReader) {
var fileReader = new FileReader();
fileReader.onload = fileReader.onerror = callback;
method = method || 'readAsDataURL';
if (fileReader[method]) {
fileReader[method](file);
return fileReader;
}
}
return false;
};
if (typeof define === 'function' && define.amd) {
define(function () {
return loadImage;
});
} else {
$.loadImage = loadImage;
}
}(window));
?>