wehub-resource-sync
55 lines
1.5 KiB
JavaScript
55 lines
1.5 KiB
JavaScript
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var loadFile = function(event) {
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var reader = new FileReader();
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reader.onload = function(){
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var preview = document.getElementById('preview_img');
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preview.src = centerCrop(reader.result);
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preview.src = resize(preview.src);
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};
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reader.readAsDataURL(event.target.files[0]);
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};
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function centerCrop(src){
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var image = new Image();
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image.src = src;
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var max_width = Math.min(image.width, image.height);
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var max_height = Math.min(image.width, image.height);
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var canvas = document.createElement('canvas');
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var ctx = canvas.getContext("2d");
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ctx.clearRect(0, 0, canvas.width, canvas.height);
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canvas.width = max_width;
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canvas.height = max_height;
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ctx.drawImage(image, (max_width - image.width)/2, (max_height - image.height)/2, image.width, image.height);
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return canvas.toDataURL("image/png");
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}
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function resize(src){
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var image = new Image();
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image.src = src;
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var canvas = document.createElement('canvas');
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canvas.width = image.width;
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canvas.height = image.height;
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var ctx = canvas.getContext("2d");
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ctx.clearRect(0, 0, canvas.width, canvas.height);
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ctx.drawImage(image, 0, 0, image.width, image.height);
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var dst = document.createElement('canvas');
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dst.width = image_dimension;
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dst.height = image_dimension;
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window.pica.WW = false;
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window.pica.resizeCanvas(canvas, dst, {
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quality: 2,
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unsharpAmount: 500,
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unsharpThreshold: 100,
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transferable: false
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}, function (err) { });
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window.pica.WW = true;
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return dst.toDataURL("image/png");
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}
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