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{ throwError, isNodePattern } from '@jimp/utils';\n\nexport default () => ({\n  /**\n   * Blits a source image on to this image\n   * @param {Jimp} src the source Jimp instance\n   * @param {number} x the x position to blit the image\n   * @param {number} y the y position to blit the image\n   * @param {number} srcx (optional) the x position from which to crop the source image\n   * @param {number} srcy (optional) the y position from which to crop the source image\n   * @param {number} srcw (optional) the width to which to crop the source image\n   * @param {number} srch (optional) the height to which to crop the source image\n   * @param {function(Error, Jimp)} cb (optional) a callback for when complete\n   * @returns {Jimp} this for chaining of methods\n   */\n  blit(src, x, y, srcx, srcy, srcw, srch, cb) {\n    if (!(src instanceof this.constructor)) {\n      return throwError.call(this, 'The source must be a Jimp image', cb);\n    }\n\n    if (typeof x !== 'number' || typeof y !== 'number') {\n      return throwError.call(this, 'x and y must be numbers', cb);\n    }\n\n    if (typeof srcx === 'function') {\n      cb = srcx;\n      srcx = 0;\n      srcy = 0;\n      srcw = src.bitmap.width;\n      srch = src.bitmap.height;\n    } else if (\n      typeof srcx === typeof srcy &&\n      typeof srcy === typeof srcw &&\n      typeof srcw === typeof srch\n    ) {\n      srcx = srcx || 0;\n      srcy = srcy || 0;\n      srcw = srcw || src.bitmap.width;\n      srch = srch || src.bitmap.height;\n    } else {\n      return throwError.call(\n        this,\n        'srcx, srcy, srcw, srch must be numbers',\n        cb\n      );\n    }\n\n    // round input\n    x = Math.round(x);\n    y = Math.round(y);\n\n    // round input\n    srcx = Math.round(srcx);\n    srcy = Math.round(srcy);\n    srcw = Math.round(srcw);\n    srch = Math.round(srch);\n\n    const maxWidth = this.bitmap.width;\n    const maxHeight = this.bitmap.height;\n    const baseImage = this;\n\n    src.scanQuiet(srcx, srcy, srcw, srch, function(sx, sy, idx) {\n      const xOffset = x + sx - srcx;\n      const yOffset = y + sy - srcy;\n\n      if (\n        xOffset >= 0 &&\n        yOffset >= 0 &&\n        maxWidth - xOffset > 0 &&\n        maxHeight - yOffset > 0\n      ) {\n        const dstIdx = baseImage.getPixelIndex(xOffset, yOffset);\n        const src = {\n          r: this.bitmap.data[idx],\n          g: this.bitmap.data[idx + 1],\n          b: this.bitmap.data[idx + 2],\n          a: this.bitmap.data[idx + 3]\n        };\n\n        const dst = {\n          r: baseImage.bitmap.data[dstIdx],\n          g: baseImage.bitmap.data[dstIdx + 1],\n          b: baseImage.bitmap.data[dstIdx + 2],\n          a: baseImage.bitmap.data[dstIdx + 3]\n        };\n\n        baseImage.bitmap.data[dstIdx] =\n          ((src.a * (src.r - dst.r) - dst.r + 255) >> 8) + dst.r;\n        baseImage.bitmap.data[dstIdx + 1] =\n          ((src.a * (src.g - dst.g) - dst.g + 255) >> 8) + dst.g;\n        baseImage.bitmap.data[dstIdx + 2] =\n          ((src.a * (src.b - dst.b) - dst.b + 255) >> 8) + dst.b;\n        baseImage.bitmap.data[dstIdx + 3] = this.constructor.limit255(\n          dst.a + src.a\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"}