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Filename : composite.js
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import { Edge } from "@jimp/types";
import { BlendMode } from "./constants.js";
import * as compositeModes from "./composite-modes.js";
import { limit255 } from "@jimp/utils";
export function composite(baseImage, src, x = 0, y = 0, options = {}) {
    if (!(src instanceof baseImage.constructor)) {
        throw new Error("The source must be a Jimp image");
    }
    if (typeof x !== "number" || typeof y !== "number") {
        throw new Error("x and y must be numbers");
    }
    const { mode = BlendMode.SRC_OVER } = options;
    let { opacitySource = 1.0, opacityDest = 1.0 } = options;
    if (typeof opacitySource !== "number" ||
        opacitySource < 0 ||
        opacitySource > 1) {
        opacitySource = 1.0;
    }
    if (typeof opacityDest !== "number" || opacityDest < 0 || opacityDest > 1) {
        opacityDest = 1.0;
    }
    const blendmode = compositeModes[mode];
    // round input
    x = Math.round(x);
    y = Math.round(y);
    if (opacityDest !== 1.0) {
        baseImage.scan((_, __, idx) => {
            const v = baseImage.bitmap.data[idx + 3] * opacityDest;
            baseImage.bitmap.data[idx + 3] = v;
        });
    }
    src.scan((sx, sy, idx) => {
        const dstIdx = baseImage.getPixelIndex(x + sx, y + sy, Edge.CROP);
        if (dstIdx === -1) {
            // Skip target pixels outside of dst
            return;
        }
        const blended = blendmode({
            r: src.bitmap.data[idx + 0] / 255,
            g: src.bitmap.data[idx + 1] / 255,
            b: src.bitmap.data[idx + 2] / 255,
            a: src.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] = limit255(blended.r * 255);
        baseImage.bitmap.data[dstIdx + 1] = limit255(blended.g * 255);
        baseImage.bitmap.data[dstIdx + 2] = limit255(blended.b * 255);
        baseImage.bitmap.data[dstIdx + 3] = limit255(blended.a * 255);
    });
    return baseImage;
}
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