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Viewing file:     index.js (2.75 KB)      -rw-r--r--

import { isNodePattern, throwError } from "@jimp/utils";
import * as constants from "../constants";
import * as compositeModes from "./composite-modes";

/**
 * Composites a source image over to this image respecting alpha channels
 * @param {Jimp} src the source Jimp instance
 * @param {number} x the x position to blit the image
 * @param {number} y the y position to blit the image
 * @param {object} options determine what mode to use
 * @param {function(Error, Jimp)} cb (optional) a callback for when complete
 * @returns {Jimp} this for chaining of methods
 */
export default function composite(src, x, y) {
  let options = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {};
  let cb = arguments.length > 4 ? arguments[4] : undefined;
  if (typeof options === "function") {
    cb = options;
    options = {};
  }
  if (!(src instanceof this.constructor)) {
    return throwError.call(this, "The source must be a Jimp image", cb);
  }
  if (typeof x !== "number" || typeof y !== "number") {
    return throwError.call(this, "x and y must be numbers", cb);
  }
  let {
    mode,
    opacitySource,
    opacityDest
  } = options;
  if (!mode) {
    mode = constants.BLEND_SOURCE_OVER;
  }
  if (typeof opacitySource !== "number" || opacitySource < 0 || opacitySource > 1) {
    opacitySource = 1.0;
  }
  if (typeof opacityDest !== "number" || opacityDest < 0 || opacityDest > 1) {
    opacityDest = 1.0;
  }

  // eslint-disable-next-line import/namespace
  const blendmode = compositeModes[mode];

  // round input
  x = Math.round(x);
  y = Math.round(y);
  const baseImage = this;
  if (opacityDest !== 1.0) {
    baseImage.opacity(opacityDest);
  }
  src.scanQuiet(0, 0, src.bitmap.width, src.bitmap.height, function (sx, sy, idx) {
    const dstIdx = baseImage.getPixelIndex(x + sx, y + sy, constants.EDGE_CROP);
    if (dstIdx === -1) {
      // Skip target pixels outside of dst
      return;
    }
    const blended = blendmode({
      r: this.bitmap.data[idx + 0] / 255,
      g: this.bitmap.data[idx + 1] / 255,
      b: this.bitmap.data[idx + 2] / 255,
      a: this.bitmap.data[idx + 3] / 255
    }, {
      r: baseImage.bitmap.data[dstIdx + 0] / 255,
      g: baseImage.bitmap.data[dstIdx + 1] / 255,
      b: baseImage.bitmap.data[dstIdx + 2] / 255,
      a: baseImage.bitmap.data[dstIdx + 3] / 255
    }, opacitySource);
    baseImage.bitmap.data[dstIdx + 0] = this.constructor.limit255(blended.r * 255);
    baseImage.bitmap.data[dstIdx + 1] = this.constructor.limit255(blended.g * 255);
    baseImage.bitmap.data[dstIdx + 2] = this.constructor.limit255(blended.b * 255);
    baseImage.bitmap.data[dstIdx + 3] = this.constructor.limit255(blended.a * 255);
  });
  if (isNodePattern(cb)) {
    cb.call(this, null, this);
  }
  return this;
}
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