function retinaScale(chart, forceRatio, forceStyle) {
    const pixelRatio = forceRatio || 1;
    const deviceHeight = Math.floor(chart.height * pixelRatio);
    const deviceWidth = Math.floor(chart.width * pixelRatio);
    chart.height = Math.floor(chart.height);
    chart.width = Math.floor(chart.width);
    const canvas = chart.canvas;
    // If no style has been set on the canvas, the render size is used as display size,
    // making the chart visually bigger, so let's enforce it to the "correct" values.
    // See https://github.com/chartjs/Chart.js/issues/3575
    if (canvas.style && (forceStyle || !canvas.style.height && !canvas.style.width)) {
        canvas.style.height = `${chart.height}px`;
        canvas.style.width = `${chart.width}px`;
    }
    if (chart.currentDevicePixelRatio !== pixelRatio || canvas.height !== deviceHeight || canvas.width !== deviceWidth) {
        chart.currentDevicePixelRatio = pixelRatio;
        canvas.height = deviceHeight;
        canvas.width = deviceWidth;
        chart.ctx.setTransform(pixelRatio, 0, 0, pixelRatio, 0, 0);
        return true;
    }
    return false;
}
@param chart
@param forceRatio
@param forceStyle
@returns True if the canvas context size or transformation has changed.