workflow/node_modules/@antv/x6/es/registry/background/flip-y.js

export const flipY = function (img) {
    // d d
    // q q
    const canvas = document.createElement('canvas');
    const width = img.width;
    const height = img.height;
    canvas.width = width;
    canvas.height = height * 2;
    const ctx = canvas.getContext('2d');
    // top image
    ctx.drawImage(img, 0, 0, width, height);
    // flipped bottom image
    ctx.translate(0, 2 * height);
    ctx.scale(1, -1);
    ctx.drawImage(img, 0, 0, width, height);
    return canvas;
};
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