jassub/dist/worker/renderers/readback.js

The Fastest JavaScript SSA/ASS Subtitle Renderer For Browsers

// Return the canvas pixels as straight RGBA. A WebGL drawing buffer must be
// read in the same task as the draw.
export function readCanvasPixels(canvas) {
    if (!canvas)
        return null;
    const { width, height } = canvas;
    const surface = new OffscreenCanvas(width, height);
    const ctx = surface.getContext('2d');
    if (!ctx)
        return null;
    ctx.drawImage(canvas, 0, 0);
    return { data: ctx.getImageData(0, 0, width, height).data, width, height };
}
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