Function drawOledIconAlphaMask

app.js:3466–3477

(ctx, src, x, y, w, h, color)

}

function drawOledIconAlphaMask(ctx, src, x, y, w, h, color) {
  const img = getCachedOledImage(src);
  if (!img || !img.complete || !img.naturalWidth) return;
  ctx.save();
  ctx.imageSmoothingEnabled = false;
  // Paint a solid rectangle then mask it by the icon alpha so it is always visible in OLED.
  ctx.fillStyle = color;
  ctx.fillRect(x, y, w, h);
  ctx.globalCompositeOperation = "destination-in";
  ctx.drawImage(img, x, y, w, h);
  ctx.restore();
}

function drawOledLine(ctx, x0, y0, x1, y1, color) {
  ctx.fillStyle = color;