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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8"/>
<script>
const spriteSheet = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAALBAMAAACEzBAKAAAAFVBMVEUAAADMr3z///8PDw9AQEC/v7/w8PCtfkxVAAAAA3RSTlMAAAD6dsTeAAAAQ0lEQVQIWy3IQRGAIAAEwJ1zCEAFLEAUK5iPClaggj9rMH7Y57prrR0pOJB1kU58OIldsSt2BQVHaIN3Rnt4p2SwJj863A7yxMyt/AAAAABJRU5ErkJggg=='
const loadImage = (src) => {
return new Promise((resolve, reject) => {
var img = new Image()
img.onload = () => resolve(img)
img.onerror = () => reject(false)
img.src = src
})
}
let cursorImage
function drawTestImage(canvasID, alphaValue) {
const ctx = document.getElementById(canvasID).getContext("2d", { alpha: alphaValue })
ctx.fillStyle = "#808080" // For contrast
ctx.fillRect(0, 0, 30, 30)
createImageBitmap(cursorImage, 0, 0, 8, 11, { premultiplyAlpha: "none" }).then(image => {
ctx.drawImage(image, 10, 10)
})
}
window.addEventListener("DOMContentLoaded", () => {
loadImage(spriteSheet).then(img => {
cursorImage = img
drawTestImage("c1", true)
})
})
</script>
</head>
<body>
<canvas id="c1" width="30" height="30"></canvas>
</body>
</html>