mirror of
https://github.com/kkapsner/CanvasBlocker
synced 2024-06-26 13:32:45 +02:00
22 lines
661 B
HTML
22 lines
661 B
HTML
<!DOCTYPE html>
|
|
<html>
|
|
<head>
|
|
<title>Test</title>
|
|
</head>
|
|
<body>
|
|
<canvas id="canvas" width="10" height="10"></canvas>
|
|
<span id="output"></span>
|
|
<script>
|
|
(function(){
|
|
var canvas = document.getElementById('canvas');
|
|
var gl = canvas.getContext('webgl');
|
|
var pixels = new Uint8Array(gl.drawingBufferWidth * gl.drawingBufferHeight * 4);
|
|
gl.readPixels(0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight, gl.RGBA, gl.UNSIGNED_BYTE, pixels);
|
|
var values = [];
|
|
for (var i = 0; i < pixels.length; i += 1){
|
|
values[pixels[i]] = (values[pixels[i]] || 0) + 1;
|
|
}
|
|
document.getElementById("output").textContent = JSON.stringify(values);
|
|
}());
|
|
</script>
|
|
</body></html> |