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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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