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1 lines
22 KiB
1 lines
22 KiB
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* Copyright (c) 2015 Guyon Roche\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to deal\n * in the Software without restriction, including without limitation the rights\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\n * copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:</p>\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN\n * THE SOFTWARE.\n */\n\nmodule.exports = {\n nearestNeighbor(src, dst) {\n const wSrc = src.width;\n const hSrc = src.height;\n\n const wDst = dst.width;\n const hDst = dst.height;\n\n const bufSrc = src.data;\n const bufDst = dst.data;\n\n for (let i = 0; i < hDst; i++) {\n for (let j = 0; j < wDst; j++) {\n let posDst = (i * wDst + j) * 4;\n\n const iSrc = Math.floor((i * hSrc) / hDst);\n const jSrc = Math.floor((j * wSrc) / wDst);\n let posSrc = (iSrc * wSrc + jSrc) * 4;\n\n bufDst[posDst++] = bufSrc[posSrc++];\n bufDst[posDst++] = bufSrc[posSrc++];\n bufDst[posDst++] = bufSrc[posSrc++];\n bufDst[posDst++] = bufSrc[posSrc++];\n }\n }\n },\n\n bilinearInterpolation(src, dst) {\n const wSrc = src.width;\n const hSrc = src.height;\n\n const wDst = dst.width;\n const hDst = dst.height;\n\n const bufSrc = src.data;\n const bufDst = dst.data;\n\n const interpolate = function(k, kMin, vMin, kMax, vMax) {\n // special case - k is integer\n if (kMin === kMax) {\n return vMin;\n }\n\n return Math.round((k - kMin) * vMax + (kMax - k) * vMin);\n };\n\n const assign = function(pos, offset, x, xMin, xMax, y, yMin, yMax) {\n let posMin = (yMin * wSrc + xMin) * 4 + offset;\n let posMax = (yMin * wSrc + xMax) * 4 + offset;\n const vMin = interpolate(x, xMin, bufSrc[posMin], xMax, bufSrc[posMax]);\n\n // special case, y is integer\n if (yMax === yMin) {\n bufDst[pos + offset] = vMin;\n } else {\n posMin = (yMax * wSrc + xMin) * 4 + offset;\n posMax = (yMax * wSrc + xMax) * 4 + offset;\n const vMax = interpolate(x, xMin, bufSrc[posMin], xMax, bufSrc[posMax]);\n\n bufDst[pos + offset] = interpolate(y, yMin, vMin, yMax, vMax);\n }\n };\n\n for (let i = 0; i < hDst; i++) {\n for (let j = 0; j < wDst; j++) {\n const posDst = (i * wDst + j) * 4;\n // x & y in src coordinates\n const x = (j * wSrc) / wDst;\n const xMin = Math.floor(x);\n const xMax = Math.min(Math.ceil(x), wSrc - 1);\n\n const y = (i * hSrc) / hDst;\n const yMin = Math.floor(y);\n const yMax = Math.min(Math.ceil(y), hSrc - 1);\n\n assign(posDst, 0, x, xMin, xMax, y, yMin, yMax);\n assign(posDst, 1, x, xMin, xMax, y, yMin, yMax);\n assign(posDst, 2, x, xMin, xMax, y, yMin, yMax);\n assign(posDst, 3, x, xMin, xMax, y, yMin, yMax);\n }\n }\n },\n\n _interpolate2D(src, dst, options, interpolate) {\n const bufSrc = src.data;\n const bufDst = dst.data;\n\n const wSrc = src.width;\n const hSrc = src.height;\n\n const wDst = dst.width;\n const hDst = dst.height;\n\n // when dst smaller than src/2, interpolate first to a multiple between 0.5 and 1.0 src, then sum squares\n const wM = Math.max(1, Math.floor(wSrc / wDst));\n const wDst2 = wDst * wM;\n const hM = Math.max(1, Math.floor(hSrc / hDst));\n const hDst2 = hDst * hM;\n\n // ===========================================================\n // Pass 1 - interpolate rows\n // buf1 has width of dst2 and height of src\n const buf1 = Buffer.alloc(wDst2 * hSrc * 4);\n for (let i = 0; i < hSrc; i++) {\n for (let j = 0; j < wDst2; j++) {\n // i in src coords, j in dst coords\n\n // calculate x in src coords\n // this interpolation requires 4 sample points and the two inner ones must be real\n // the outer points can be fudged for the edges.\n // therefore (wSrc-1)/wDst2\n const x = (j * (wSrc - 1)) / wDst2;\n const xPos = Math.floor(x);\n const t = x - xPos;\n const srcPos = (i * wSrc + xPos) * 4;\n const buf1Pos = (i * wDst2 + j) * 4;\n\n for (let k = 0; k < 4; k++) {\n const kPos = srcPos + k;\n const x0 =\n xPos > 0 ? bufSrc[kPos - 4] : 2 * bufSrc[kPos] - bufSrc[kPos + 4];\n const x1 = bufSrc[kPos];\n const x2 = bufSrc[kPos + 4];\n const x3 =\n xPos < wSrc - 2\n ? bufSrc[kPos + 8]\n : 2 * bufSrc[kPos + 4] - bufSrc[kPos];\n buf1[buf1Pos + k] = interpolate(x0, x1, x2, x3, t);\n }\n }\n }\n // this._writeFile(wDst2, hSrc, buf1, \"out/buf1.jpg\");\n\n // ===========================================================\n // Pass 2 - interpolate columns\n // buf2 has width and height of dst2\n const buf2 = Buffer.alloc(wDst2 * hDst2 * 4);\n for (let i = 0; i < hDst2; i++) {\n for (let j = 0; j < wDst2; j++) {\n // i&j in dst2 coords\n\n // calculate y in buf1 coords\n // this interpolation requires 4 sample points and the two inner ones must be real\n // the outer points can be fudged for the edges.\n // therefore (hSrc-1)/hDst2\n const y = (i * (hSrc - 1)) / hDst2;\n const yPos = Math.floor(y);\n const t = y - yPos;\n const buf1Pos = (yPos * wDst2 + j) * 4;\n const buf2Pos = (i * wDst2 + j) * 4;\n for (let k = 0; k < 4; k++) {\n const kPos = buf1Pos + k;\n const y0 =\n yPos > 0\n ? buf1[kPos - wDst2 * 4]\n : 2 * buf1[kPos] - buf1[kPos + wDst2 * 4];\n const y1 = buf1[kPos];\n const y2 = buf1[kPos + wDst2 * 4];\n const y3 =\n yPos < hSrc - 2\n ? buf1[kPos + wDst2 * 8]\n : 2 * buf1[kPos + wDst2 * 4] - buf1[kPos];\n\n buf2[buf2Pos + k] = interpolate(y0, y1, y2, y3, t);\n }\n }\n }\n // this._writeFile(wDst2, hDst2, buf2, \"out/buf2.jpg\");\n\n // ===========================================================\n // Pass 3 - scale to dst\n const m = wM * hM;\n if (m > 1) {\n for (let i = 0; i < hDst; i++) {\n for (let j = 0; j < wDst; j++) {\n // i&j in dst bounded coords\n let r = 0;\n let g = 0;\n let b = 0;\n let a = 0;\n let realColors = 0;\n\n for (let y = 0; y < hM; y++) {\n const yPos = i * hM + y;\n\n for (let x = 0; x < wM; x++) {\n const xPos = j * wM + x;\n const xyPos = (yPos * wDst2 + xPos) * 4;\n const pixelAlpha = buf2[xyPos + 3];\n\n if (pixelAlpha) {\n r += buf2[xyPos];\n g += buf2[xyPos + 1];\n b += buf2[xyPos + 2];\n realColors++;\n }\n\n a += pixelAlpha;\n }\n }\n\n const pos = (i * wDst + j) * 4;\n bufDst[pos] = realColors ? Math.round(r / realColors) : 0;\n bufDst[pos + 1] = realColors ? Math.round(g / realColors) : 0;\n bufDst[pos + 2] = realColors ? Math.round(b / realColors) : 0;\n bufDst[pos + 3] = Math.round(a / m);\n }\n }\n } else {\n // replace dst buffer with buf2\n dst.data = buf2;\n }\n },\n\n bicubicInterpolation(src, dst, options) {\n const interpolateCubic = function(x0, x1, x2, x3, t) {\n const a0 = x3 - x2 - x0 + x1;\n const a1 = x0 - x1 - a0;\n const a2 = x2 - x0;\n const a3 = x1;\n return Math.max(\n 0,\n Math.min(255, a0 * (t * t * t) + a1 * (t * t) + a2 * t + a3)\n );\n };\n\n return this._interpolate2D(src, dst, options, interpolateCubic);\n },\n\n hermiteInterpolation(src, dst, options) {\n const interpolateHermite = function(x0, x1, x2, x3, t) {\n const c0 = x1;\n const c1 = 0.5 * (x2 - x0);\n const c2 = x0 - 2.5 * x1 + 2 * x2 - 0.5 * x3;\n const c3 = 0.5 * (x3 - x0) + 1.5 * (x1 - x2);\n return Math.max(\n 0,\n Math.min(255, Math.round(((c3 * t + c2) * t + c1) * t + c0))\n );\n };\n\n return this._interpolate2D(src, dst, options, interpolateHermite);\n },\n\n bezierInterpolation(src, dst, options) {\n // between 2 points y(n), y(n+1), use next points out, y(n-1), y(n+2)\n // to predict control points (a & b) to be placed at n+0.5\n // ya(n) = y(n) + (y(n+1)-y(n-1))/4\n // yb(n) = y(n+1) - (y(n+2)-y(n))/4\n // then use std bezier to interpolate [n,n+1)\n // y(n+t) = y(n)*(1-t)^3 + 3 * ya(n)*(1-t)^2*t + 3 * yb(n)*(1-t)*t^2 + y(n+1)*t^3\n // note the 3* factor for the two control points\n // for edge cases, can choose:\n // y(-1) = y(0) - 2*(y(1)-y(0))\n // y(w) = y(w-1) + 2*(y(w-1)-y(w-2))\n // but can go with y(-1) = y(0) and y(w) = y(w-1)\n const interpolateBezier = function(x0, x1, x2, x3, t) {\n // x1, x2 are the knots, use x0 and x3 to calculate control points\n const cp1 = x1 + (x2 - x0) / 4;\n const cp2 = x2 - (x3 - x1) / 4;\n const nt = 1 - t;\n const c0 = x1 * nt * nt * nt;\n const c1 = 3 * cp1 * nt * nt * t;\n const c2 = 3 * cp2 * nt * t * t;\n const c3 = x2 * t * t * t;\n return Math.max(0, Math.min(255, Math.round(c0 + c1 + c2 + c3)));\n };\n\n return this._interpolate2D(src, dst, options, interpolateBezier);\n }\n};\n"],"file":"resize2.js"} |