1 line
5.5 KiB
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1 line
5.5 KiB
Plaintext
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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"} |