sneedgroup-holder/openOutpaint
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Crop transparency

Browse source
This commit is contained in:
Kalekki 2022-11-16 23:33:20 +02:00
parent 0807ce846c
commit b78f94b72e
1 changed files with 33 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

34
js/index.js
View file

@ -538,6 +538,38 @@ function drawBackground() {
function downloadImage() {
var link = document.createElement('a');
link.download = 'image.png';
link.href = imgCanvas.toDataURL('image/png');
link.href = cropCanvas(imgCanvas).toDataURL('image/png');
link.click();
}
function cropCanvas(sourceCanvas) {
var w = sourceCanvas.width;
var h = sourceCanvas.height;
var pix = {x:[], y:[]};
var imageData = sourceCanvas.getContext('2d').getImageData(0, 0, w, h);
var x, y, index;
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
index = (y * w + x) * 4;
if (imageData.data[index+3] > 0) {
pix.x.push(x);
pix.y.push(y);
}
}
}
pix.x.sort(function(a,b){return a-b});
pix.y.sort(function(a,b){return a-b});
var n = pix.x.length-1;
w = pix.x[n] - pix.x[0];
h = pix.y[n] - pix.y[0];
var cut = sourceCanvas.getContext('2d').getImageData(pix.x[0], pix.y[0], w, h);
var cutCanvas = document.createElement('canvas');
cutCanvas.width = w;
cutCanvas.height = h;
cutCanvas.getContext('2d').putImageData(cut, 0, 0);
return cutCanvas;
}