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69 lines
1.5 KiB
JavaScript
69 lines
1.5 KiB
JavaScript
function init() {
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function end() {
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document.documentElement.className = '';
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}
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function next() {
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compressAndDisplay(original, end);
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}
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var original = getImageFromDataUrl(sample);
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setImgLoadListener(original, next);
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}
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function compressAndDisplay(image, next) {
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var canvas = document.createElement('canvas');
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canvas.width = image.naturalWidth;
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canvas.height = image.naturalHeight;
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var ctx = canvas.getContext('2d');
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ctx.drawImage(image, 0, 0);
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function gotBlob(blob) {
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var img = getImageFromBlob(blob);
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setImgLoadListener(img, next);
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document.body.appendChild(img);
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}
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// I want to test passing 'undefined' as quality as well
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if ('quality' in window) {
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canvas.toBlob(gotBlob, 'image/jpeg', quality);
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} else {
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canvas.toBlob(gotBlob, 'image/jpeg');
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}
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}
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function setImgLoadListener(img, func) {
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if (img.complete) {
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func.call(img, { target: img});
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} else {
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img.addEventListener('load', func);
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}
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}
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function naturalDimensionsHandler(e) {
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var img = e.target;
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img.width = img.naturalWidth;
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img.height = img.naturalHeight;
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}
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function getImageFromBlob(blob) {
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var img = document.createElement('img');
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img.src = window.URL.createObjectURL(blob);
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setImgLoadListener(img, naturalDimensionsHandler);
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setImgLoadListener(img, function(e) {
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window.URL.revokeObjectURL(e.target.src);
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});
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return img;
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}
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function getImageFromDataUrl(url) {
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var img = document.createElement('img');
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img.src = url;
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setImgLoadListener(img, naturalDimensionsHandler);
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return img;
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}
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init();
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