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a fast Box Blur For Canvas\n\nVersion: 0.5\nAuthor: Mario Klingemann\nContact: mario@quasimondo.com\nWebsite: http://www.quasimondo.com/BoxBlurForCanvas\nTwitter: @quasimondo\n\nIn case you find this class useful - especially in commercial projects -\nI am not totally unhappy for a small donation to my PayPal account\nmario@quasimondo.de\n\nOr support me on flattr:\nhttps://flattr.com/thing/140066/Superfast-Blur-a-pretty-fast-Box-Blur-Effect-for-CanvasJavascript\n\nCopyright (c) 2011 Mario Klingemann\n\nPermission is hereby granted, free of charge, to any person\nobtaining a copy of this software and associated documentation\nfiles (the \"Software\"), to deal in the Software without\nrestriction, including without limitation the rights to use,\ncopy, modify, merge, publish, distribute, sublicense, and/or sell\ncopies of the Software, and to permit persons to whom the\nSoftware is furnished to do so, subject to the following\nconditions:\n\nThe above copyright notice and this permission notice shall be\nincluded in all copies or substantial portions of the Software.\n\nTHE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND,\nEXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES\nOF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND\nNONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT\nHOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,\nWHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\nFROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR\nOTHER DEALINGS IN THE SOFTWARE.\n*/\n\n// eslint-disable-next-line max-len\nconst mul_table = [1, 57, 41, 21, 203, 34, 97, 73, 227, 91, 149, 62, 105, 45, 39, 137, 241, 107, 3, 173, 39, 71, 65, 238, 219, 101, 187, 87, 81, 151, 141, 133, 249, 117, 221, 209, 197, 187, 177, 169, 5, 153, 73, 139, 133, 127, 243, 233, 223, 107, 103, 99, 191, 23, 177, 171, 165, 159, 77, 149, 9, 139, 135, 131, 253, 245, 119, 231, 224, 109, 211, 103, 25, 195, 189, 23, 45, 175, 171, 83, 81, 79, 155, 151, 147, 9, 141, 137, 67, 131, 129, 251, 123, 30, 235, 115, 113, 221, 217, 53, 13, 51, 50, 49, 193, 189, 185, 91, 179, 175, 43, 169, 83, 163, 5, 79, 155, 19, 75, 147, 145, 143, 35, 69, 17, 67, 33, 65, 255, 251, 247, 243, 239, 59, 29, 229, 113, 111, 219, 27, 213, 105, 207, 51, 201, 199, 49, 193, 191, 47, 93, 183, 181, 179, 11, 87, 43, 85, 167, 165, 163, 161, 159, 157, 155, 77, 19, 75, 37, 73, 145, 143, 141, 35, 138, 137, 135, 67, 33, 131, 129, 255, 63, 250, 247, 61, 121, 239, 237, 117, 29, 229, 227, 225, 111, 55, 109, 216, 213, 211, 209, 207, 205, 203, 201, 199, 197, 195, 193, 48, 190, 47, 93, 185, 183, 181, 179, 178, 176, 175, 173, 171, 85, 21, 167, 165, 41, 163, 161, 5, 79, 157, 78, 154, 153, 19, 75, 149, 74, 147, 73, 144, 143, 71, 141, 140, 139, 137, 17, 135, 134, 133, 66, 131, 65, 129, 1];\n// eslint-disable-next-line max-len\nconst shg_table = [0, 9, 10, 10, 14, 12, 14, 14, 16, 15, 16, 15, 16, 15, 15, 17, 18, 17, 12, 18, 16, 17, 17, 19, 19, 18, 19, 18, 18, 19, 19, 19, 20, 19, 20, 20, 20, 20, 20, 20, 15, 20, 19, 20, 20, 20, 21, 21, 21, 20, 20, 20, 21, 18, 21, 21, 21, 21, 20, 21, 17, 21, 21, 21, 22, 22, 21, 22, 22, 21, 22, 21, 19, 22, 22, 19, 20, 22, 22, 21, 21, 21, 22, 22, 22, 18, 22, 22, 21, 22, 22, 23, 22, 20, 23, 22, 22, 23, 23, 21, 19, 21, 21, 21, 23, 23, 23, 22, 23, 23, 21, 23, 22, 23, 18, 22, 23, 20, 22, 23, 23, 23, 21, 22, 20, 22, 21, 22, 24, 24, 24, 24, 24, 22, 21, 24, 23, 23, 24, 21, 24, 23, 24, 22, 24, 24, 22, 24, 24, 22, 23, 24, 24, 24, 20, 23, 22, 23, 24, 24, 24, 24, 24, 24, 24, 23, 21, 23, 22, 23, 24, 24, 24, 22, 24, 24, 24, 23, 22, 24, 24, 25, 23, 25, 25, 23, 24, 25, 25, 24, 22, 25, 25, 25, 24, 23, 24, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 23, 25, 23, 24, 25, 25, 25, 25, 25, 25, 25, 25, 25, 24, 22, 25, 25, 23, 25, 25, 20, 24, 25, 24, 25, 25, 22, 24, 25, 24, 25, 24, 25, 25, 24, 25, 25, 25, 25, 22, 25, 25, 25, 24, 25, 24, 25, 18];\n\nexport default function boxBlurCanvasRGB(context, top_x, top_y, width, height, radius, iterations) {\n if (Number.isNaN(radius) || radius < 1) return;\n\n radius |= 0;\n\n if (Number.isNaN(iterations)) iterations = 1;\n iterations |= 0;\n if (iterations > 3) iterations = 3;\n if (iterations < 1) iterations = 1;\n\n const imageData = context.getImageData(top_x, top_y, width, height);\n\n const pixels = imageData.data;\n\n let rsum;\n let gsum;\n let bsum;\n let x;\n let y;\n let i;\n let p;\n let p1;\n let p2;\n let yp;\n let yi;\n let yw;\n let wm = width - 1;\n let hm = height - 1;\n let rad1 = radius + 1;\n\n let r = [];\n let g = [];\n let b = [];\n\n let mul_sum = mul_table[radius];\n let shg_sum = shg_table[radius];\n\n let vmin = [];\n let vmax = [];\n\n while (iterations-- > 0) {\n yw = yi = 0;\n\n for (y = 0; y < height; y++) {\n rsum = pixels[yw] * rad1;\n gsum = pixels[yw + 1] * rad1;\n bsum = pixels[yw + 2] * rad1;\n\n for (i = 1; i <= radius; i++) {\n p = yw + (((i > wm ? wm : i)) << 2);\n rsum += pixels[p++];\n gsum += pixels[p++];\n bsum += pixels[p++];\n }\n\n for (x = 0; x < width; x++) {\n r[yi] = rsum;\n g[yi] = gsum;\n b[yi] = bsum;\n\n if (y == 0) {\n vmin[x] = ((p = x + rad1) < wm ? p : wm) << 2;\n vmax[x] = ((p = x - radius) > 0 ? p << 2 : 0);\n }\n\n p1 = yw + vmin[x];\n p2 = yw + vmax[x];\n\n rsum += pixels[p1++] - pixels[p2++];\n gsum += pixels[p1++] - pixels[p2++];\n bsum += pixels[p1++] - pixels[p2++];\n\n yi++;\n }\n yw += (width << 2);\n }\n\n for (x = 0; x < width; x++) {\n yp = x;\n rsum = r[yp] * rad1;\n gsum = g[yp] * rad1;\n bsum = b[yp] * rad1;\n\n for (i = 1; i <= radius; i++) {\n yp += (i > hm ? 0 : width);\n rsum += r[yp];\n gsum += g[yp];\n bsum += b[yp];\n }\n\n yi = x << 2;\n for (y = 0; y < height; y++) {\n pixels[yi] = (rsum * mul_sum) >>> shg_sum;\n pixels[yi + 1] = (gsum * mul_sum) >>> shg_sum;\n pixels[yi + 2] = (bsum * mul_sum) >>> shg_sum;\n\n if (x == 0) {\n vmin[y] = ((p = y + rad1) < hm ? p : hm) * width;\n vmax[y] = ((p = y - radius) > 0 ? p * width : 0);\n }\n\n p1 = x + vmin[y];\n p2 = x + vmax[y];\n\n rsum += r[p1] - r[p2];\n gsum += g[p1] - g[p2];\n bsum += b[p1] - b[p2];\n\n yi += width << 2;\n }\n }\n }\n\n context.putImageData(imageData, top_x, top_y);\n}\n"],"names":["mul_table","shg_table","boxBlurCanvasRGB","context","top_x","top_y","width","height","radius","iterations","Number","isNaN","imageData","getImageData","pixels","data","rsum","gsum","bsum","x","y","i","p","p1","p2","yp","yi","yw","wm","hm","rad1","r","g","b","mul_sum","shg_sum","vmin","vmax","putImageData"],"sourceRoot":""} |