Created
May 30, 2018 18:15
-
-
Save rayinla/252927a8828a4f5c10baa6293bded06d to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
let $photoInput = document.getElementById("input"); | |
let image = new Image(); | |
let $editor = document.getElementById("editor"); | |
let $editorCtx = $editor.getContext("2d"); | |
function opacitor(op) { | |
let imgData = $editorCtx.getImageData(0, 0, $editor.width, $editor.height); | |
for (let x = 0; x < image.width; x++) { | |
for (let y = 0; y < image.height; y++) { | |
let index = (x + y * image.width) * 4; | |
imgData.data[index + 3] = op; | |
} | |
} | |
$editorCtx.putImageData(imgData, 0, 0); | |
} | |
$photoInput.addEventListener("change", e => { | |
let file = e.target.files[0]; | |
createImageBitmap(file).then(bitmap => { | |
$editor.width = bitmap.width; | |
$editor.height = bitmap.height; | |
$editorCtx.drawImage(bitmap, 0, 0); | |
opacitor(257); | |
}); | |
}); |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment