stable-diffusion-webui-forge/javascript/hires_fix.js

function onCalcResolutionHires(
    enable,
    width,
    height,
    hr_scale,
    hr_resize_x,
    hr_resize_y,
) {
    function setInactive(elem, inactive) {
        elem.classList.toggle("inactive", !!inactive);
    }

    let hrUpscaleBy = gradioApp().getElementById("txt2img_hr_scale");
    let hrResizeX = gradioApp().getElementById("txt2img_hr_resize_x");
    let hrResizeY = gradioApp().getElementById("txt2img_hr_resize_y");

    gradioApp().getElementById("txt2img_hires_fix_row2").style.display =
        opts.use_old_hires_fix_width_height ? "none" : "";

    setInactive(
        hrUpscaleBy,
        opts.use_old_hires_fix_width_height || hr_resize_x > 0 || hr_resize_y > 0,
    );
    setInactive(
        hrResizeX,
        opts.use_old_hires_fix_width_height || hr_resize_x == 0,
    );
    setInactive(
        hrResizeY,
        opts.use_old_hires_fix_width_height || hr_resize_y == 0,
    );

    return [enable, width, height, hr_scale, hr_resize_x, hr_resize_y];
}