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fix for uploading image in mnist demo #96

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84 changes: 46 additions & 38 deletions demo/js/image-helpers.js
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Original file line number Diff line number Diff line change
Expand Up @@ -3,52 +3,60 @@ var loadFile = function(event) {
var reader = new FileReader();
reader.onload = function(){
var preview = document.getElementById('preview_img');
preview.src = centerCrop(reader.result);
preview.src = resize(preview.src);
centerCrop(reader.result)
.then(resize)
.then(function (src) {
preview.src = src;
});
};
reader.readAsDataURL(event.target.files[0]);
};

function centerCrop(src){
return new Promise(function (resolve) {
var image = new Image();
image.src = src;

var max_width = Math.min(image.width, image.height);
var max_height = Math.min(image.width, image.height);

var canvas = document.createElement('canvas');
var ctx = canvas.getContext("2d");

ctx.clearRect(0, 0, canvas.width, canvas.height);
canvas.width = max_width;
canvas.height = max_height;
ctx.drawImage(image, (max_width - image.width)/2, (max_height - image.height)/2, image.width, image.height);
return canvas.toDataURL("image/png");
image.onload = function () {
var max_width = Math.min(image.width, image.height);
var max_height = Math.min(image.width, image.height);

var canvas = document.createElement('canvas');
var ctx = canvas.getContext("2d");

ctx.clearRect(0, 0, canvas.width, canvas.height);
canvas.width = max_width;
canvas.height = max_height;
ctx.drawImage(image, (max_width - image.width)/2, (max_height - image.height)/2, image.width, image.height);
resolve(canvas.toDataURL("image/png"));
};
});
}

function resize(src){
var image = new Image();
image.src = src;

var canvas = document.createElement('canvas');
canvas.width = image.width;
canvas.height = image.height;
var ctx = canvas.getContext("2d");
ctx.clearRect(0, 0, canvas.width, canvas.height);
ctx.drawImage(image, 0, 0, image.width, image.height);

var dst = document.createElement('canvas');
dst.width = image_dimension;
dst.height = image_dimension;

window.pica.WW = false;
window.pica.resizeCanvas(canvas, dst, {
quality: 2,
unsharpAmount: 500,
unsharpThreshold: 100,
transferable: false
}, function (err) { });
window.pica.WW = true;
return dst.toDataURL("image/png");
var image = new Image();
image.src = src;
return new Promise(function (resolve) {
image.onload = function () {
var canvas = document.createElement('canvas');
canvas.width = image.width;
canvas.height = image.height;
var ctx = canvas.getContext("2d");
ctx.clearRect(0, 0, canvas.width, canvas.height);
ctx.drawImage(image, 0, 0, image.width, image.height);

var dst = document.createElement('canvas');
dst.width = image_dimension;
dst.height = image_dimension;

window.pica.WW = false;
window.pica.resizeCanvas(canvas, dst, {
quality: 2,
unsharpAmount: 500,
unsharpThreshold: 100,
transferable: false
}, function (err) { });
window.pica.WW = true;
resolve(dst.toDataURL("image/png"));
};
});
}