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// significant radius\n    const range = rs * 2 + 1;\n    const rr2 = r * r * 2;\n    const rr2pi = rr2 * Math.PI;\n\n    const weights = [];\n\n    for (let y = 0; y < range; y++) {\n      weights[y] = [];\n      for (let x = 0; x < range; x++) {\n        const dsq = (x - rs) ** 2 + (y - rs) ** 2 ;\n        weights[y][x] = Math.exp(-dsq / rr2) / rr2pi;\n      }\n    }\n\n    for (let y = 0; y < this.bitmap.height; y++) {\n      for (let x = 0; x < this.bitmap.width; x++) {\n        let red = 0;\n        let green = 0;\n        let blue = 0;\n        let alpha = 0;\n        let wsum = 0;\n\n        for (let iy = 0; iy < range; iy++) {\n          for (let ix = 0; ix < range; ix++) {\n            const x1 = Math.min(this.bitmap.width - 1, Math.max(0, ix + x - rs ));\n            const y1 = Math.min(this.bitmap.height - 1, Math.max(0, iy + y - rs));\n            const weight = weights[iy][ix];\n            const idx = (y1 * this.bitmap.width + x1) << 2;\n\n            red += this.bitmap.data[idx] * weight;\n            green += this.bitmap.data[idx + 1] * weight;\n            blue += this.bitmap.data[idx + 2] * weight;\n            alpha += this.bitmap.data[idx + 3] * weight;\n            wsum += weight;\n          }\n\n          const idx = (y * this.bitmap.width + x) << 2;\n\n          this.bitmap.data[idx] = Math.round(red / wsum);\n          this.bitmap.data[idx + 1] = Math.round(green / wsum);\n          this.bitmap.data[idx + 2] = Math.round(blue / wsum);\n          this.bitmap.data[idx + 3] = Math.round(alpha / wsum);\n        }\n      }\n    }\n\n    if (isNodePattern(cb)) {\n      cb.call(this, null, this);\n    }\n\n    return this;\n  }\n});\n"],"file":"index.js"}