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static/app2/js/canvasResize.js
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344
static/app2/js/canvasResize.js
Executable file
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/*
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*
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* canvasResize
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*
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* Version: 1.2.0
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* Date (d/m/y): 02/10/12
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* Update (d/m/y): 14/05/13
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* Original author: @gokercebeci
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* Licensed under the MIT license
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* - This plugin working with binaryajax.js and exif.js
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* (It's under the MPL License http://www.nihilogic.dk/licenses/mpl-license.txt)
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* Demo: http://canvasResize.gokercebeci.com/
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*
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* - I fixed iOS6 Safari's image file rendering issue for large size image (over mega-pixel)
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* using few functions from https://github.com/stomita/ios-imagefile-megapixel
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* (detectSubsampling, )
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* And fixed orientation issue by using https://github.com/jseidelin/exif-js
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* Thanks, Shinichi Tomita and Jacob Seidelin
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*/
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(function($) {
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var pluginName = 'canvasResize',
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methods = {
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newsize: function(w, h, W, H, C) {
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var c = C ? 'h' : '';
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if ((W && w > W) || (H && h > H)) {
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var r = w / h;
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if ((r >= 1 || H === 0) && W && !C) {
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w = W;
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h = (W / r) >> 0;
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} else if (C && r <= (W / H)) {
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w = W;
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h = (W / r) >> 0;
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c = 'w';
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} else {
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w = (H * r) >> 0;
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h = H;
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}
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}
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return {
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'width': w,
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'height': h,
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'cropped': c
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};
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},
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dataURLtoBlob: function(data) {
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var mimeString = data.split(',')[0].split(':')[1].split(';')[0];
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var byteString = atob(data.split(',')[1]);
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var ab = new ArrayBuffer(byteString.length);
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var ia = new Uint8Array(ab);
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for (var i = 0; i < byteString.length; i++) {
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ia[i] = byteString.charCodeAt(i);
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}
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var bb = (window.BlobBuilder || window.WebKitBlobBuilder || window.MozBlobBuilder);
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if (bb) {
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// console.log('BlobBuilder');
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bb = new (window.BlobBuilder || window.WebKitBlobBuilder || window.MozBlobBuilder)();
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bb.append(ab);
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return bb.getBlob(mimeString);
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} else {
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// console.log('Blob');
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bb = new Blob([ab], {
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'type': (mimeString)
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});
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return bb;
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}
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},
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/**
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* Detect subsampling in loaded image.
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* In iOS, larger images than 2M pixels may be subsampled in rendering.
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*/
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detectSubsampling: function(img) {
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var iw = img.width, ih = img.height;
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if (iw * ih > 1048576) { // subsampling may happen over megapixel image
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var canvas = document.createElement('canvas');
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canvas.width = canvas.height = 1;
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var ctx = canvas.getContext('2d');
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ctx.drawImage(img, -iw + 1, 0);
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// subsampled image becomes half smaller in rendering size.
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// check alpha channel value to confirm image is covering edge pixel or not.
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// if alpha value is 0 image is not covering, hence subsampled.
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return ctx.getImageData(0, 0, 1, 1).data[3] === 0;
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} else {
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return false;
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}
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},
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/**
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* Update the orientation according to the specified rotation angle
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*/
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rotate: function(orientation, angle) {
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var o = {
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// nothing
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1: {90: 6, 180: 3, 270: 8},
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// horizontal flip
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2: {90: 7, 180: 4, 270: 5},
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// 180 rotate left
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3: {90: 8, 180: 1, 270: 6},
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// vertical flip
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4: {90: 5, 180: 2, 270: 7},
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// vertical flip + 90 rotate right
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5: {90: 2, 180: 7, 270: 4},
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// 90 rotate right
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6: {90: 3, 180: 8, 270: 1},
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// horizontal flip + 90 rotate right
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7: {90: 4, 180: 5, 270: 2},
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// 90 rotate left
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8: {90: 1, 180: 6, 270: 3}
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};
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return o[orientation][angle] ? o[orientation][angle] : orientation;
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},
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/**
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* Transform canvas coordination according to specified frame size and orientation
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* Orientation value is from EXIF tag
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*/
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transformCoordinate: function(canvas, width, height, orientation) {
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switch (orientation) {
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case 5:
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case 6:
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case 7:
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case 8:
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canvas.width = height;
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canvas.height = width;
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break;
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default:
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canvas.width = width;
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canvas.height = height;
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}
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var ctx = canvas.getContext('2d');
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switch (orientation) {
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case 1:
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// nothing
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break;
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case 2:
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// horizontal flip
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ctx.translate(width, 0);
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ctx.scale(-1, 1);
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break;
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case 3:
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// 180 rotate left
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ctx.translate(width, height);
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ctx.rotate(Math.PI);
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break;
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case 4:
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// vertical flip
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ctx.translate(0, height);
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ctx.scale(1, -1);
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break;
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case 5:
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// vertical flip + 90 rotate right
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ctx.rotate(0.5 * Math.PI);
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ctx.scale(1, -1);
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break;
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case 6:
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// 90 rotate right
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ctx.rotate(0.5 * Math.PI);
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ctx.translate(0, -height);
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break;
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case 7:
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// horizontal flip + 90 rotate right
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ctx.rotate(0.5 * Math.PI);
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ctx.translate(width, -height);
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ctx.scale(-1, 1);
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break;
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case 8:
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// 90 rotate left
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ctx.rotate(-0.5 * Math.PI);
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ctx.translate(-width, 0);
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break;
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default:
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break;
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}
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},
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/**
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* Detecting vertical squash in loaded image.
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* Fixes a bug which squash image vertically while drawing into canvas for some images.
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*/
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detectVerticalSquash: function(img, iw, ih) {
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var canvas = document.createElement('canvas');
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canvas.width = 1;
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canvas.height = ih;
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var ctx = canvas.getContext('2d');
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ctx.drawImage(img, 0, 0);
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var data = ctx.getImageData(0, 0, 1, ih).data;
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// search image edge pixel position in case it is squashed vertically.
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var sy = 0;
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var ey = ih;
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var py = ih;
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while (py > sy) {
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var alpha = data[(py - 1) * 4 + 3];
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if (alpha === 0) {
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ey = py;
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} else {
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sy = py;
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}
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py = (ey + sy) >> 1;
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}
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var ratio = py / ih;
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return ratio === 0 ? 1 : ratio;
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},
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callback: function(d) {
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return d;
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},
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extend: function() {
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var target = arguments[0] || {}, a = 1, al = arguments.length, deep = false;
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if (target.constructor === Boolean) {
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deep = target;
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target = arguments[1] || {};
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}
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if (al === 1) {
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target = this;
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a = 0;
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}
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var prop;
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for (; a < al; a++)
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if ((prop = arguments[a]) !== null)
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for (var i in prop) {
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if (target === prop[i])
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continue;
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if (deep && typeof prop[i] === 'object' && target[i])
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methods.extend(target[i], prop[i]);
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else if (prop[i] !== undefined)
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target[i] = prop[i];
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}
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return target;
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}
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},
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defaults = {
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width: 300,
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height: 0,
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crop: false,
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quality: 80,
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rotate: 0,
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'callback': methods.callback
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};
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function Plugin(file, options) {
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this.file = file;
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// EXTEND
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this.options = methods.extend({}, defaults, options);
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this._defaults = defaults;
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this._name = pluginName;
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this.init();
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}
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Plugin.prototype = {
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init: function() {
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//this.options.init(this);
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var $this = this;
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var file = this.file;
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var reader = new plus.io.FileReader();
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reader.onloadend = function(e) {
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var dataURL = e.target.result;
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var byteString = atob(dataURL.split(',')[1]);
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var binary = new BinaryFile(byteString, 0, byteString.length);
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var exif = EXIF.readFromBinaryFile(binary);
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var img = new Image();
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img.onload = function(e) {
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var orientation = exif['Orientation'] || 1;
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orientation = methods.rotate(orientation, $this.options.rotate);
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// CW or CCW ? replace width and height
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var size = (orientation >= 5 && orientation <= 8)
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? methods.newsize(img.height, img.width, $this.options.width, $this.options.height, $this.options.crop)
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: methods.newsize(img.width, img.height, $this.options.width, $this.options.height, $this.options.crop);
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var iw = img.width, ih = img.height;
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var width = size.width, height = size.height;
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var canvas = document.createElement("canvas");
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var ctx = canvas.getContext("2d");
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ctx.save();
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methods.transformCoordinate(canvas, width, height, orientation);
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// over image size
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if (methods.detectSubsampling(img)) {
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iw /= 2;
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ih /= 2;
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}
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var d = 1024; // size of tiling canvas
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var tmpCanvas = document.createElement('canvas');
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tmpCanvas.width = tmpCanvas.height = d;
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var tmpCtx = tmpCanvas.getContext('2d');
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var vertSquashRatio = methods.detectVerticalSquash(img, iw, ih);
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var sy = 0;
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while (sy < ih) {
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var sh = sy + d > ih ? ih - sy : d;
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var sx = 0;
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while (sx < iw) {
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var sw = sx + d > iw ? iw - sx : d;
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tmpCtx.clearRect(0, 0, d, d);
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tmpCtx.drawImage(img, -sx, -sy);
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var dx = Math.floor(sx * width / iw);
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var dw = Math.ceil(sw * width / iw);
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var dy = Math.floor(sy * height / ih / vertSquashRatio);
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var dh = Math.ceil(sh * height / ih / vertSquashRatio);
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ctx.drawImage(tmpCanvas, 0, 0, sw, sh, dx, dy, dw, dh);
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sx += d;
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}
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sy += d;
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}
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ctx.restore();
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tmpCanvas = tmpCtx = null;
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// if rotated width and height data replacing issue
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var newcanvas = document.createElement('canvas');
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newcanvas.width = size.cropped === 'h' ? height : width;
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newcanvas.height = size.cropped === 'w' ? width : height;
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var x = size.cropped === 'h' ? (height - width) * .5 : 0;
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var y = size.cropped === 'w' ? (width - height) * .5 : 0;
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newctx = newcanvas.getContext('2d');
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newctx.drawImage(canvas, x, y, width, height);
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// console.log(file, file.type);
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if (file.type === "image/png") {
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var data = newcanvas.toDataURL(file.type);
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} else {
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var data = newcanvas.toDataURL("image/jpeg", ($this.options.quality * .01));
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}
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// CALLBACK
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$this.options.callback(data, newcanvas.width, newcanvas.height);
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// });
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};
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img.src = dataURL;
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// =====================================================
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};
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reader.readAsDataURL(file);
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//reader.readAsBinaryString(file);
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}
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};
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$[pluginName] = function(file, options) {
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// console.log(file.size);
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if (typeof file === 'string')
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return methods[file](options);
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else
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new Plugin(file, options);
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};
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})(window);
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