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3] = a; } } // Copy back to data for vertical pass data.set(output); // Apply vertical blur for (let x = 0; x < width; x++) { for (let y = 0; y < height; y++) { let r = 0, g = 0, b = 0, a = 0; for (let k = 0; k < kernelSize; k++) { const py = Math.min(Math.max(y + k - Math.floor(kernelSize / 2), 0), height - 1); const idx = (py * width + x) * 4; const weight = kernel[k]; r += data[idx] * weight; g += data[idx + 1] * weight; b += data[idx + 2] * weight; a += data[idx + 3] * weight; } const idx = (y * width + x) * 4; output[idx] = r; output[idx + 1] = g; output[idx + 2] = b; output[idx +