import * as tslib_1 from "tslib";
import { createCanvas, env, getContext2dOrThrow, imageTensorToCanvas, toNetInput, } from 'tfjs-image-recognition-base';
import { FaceDetection } from '../classes/FaceDetection';
/**
 * Extracts the image regions containing the detected faces.
 *
 * @param input The image that face detection has been performed on.
 * @param detections The face detection results or face bounding boxes for that image.
 * @returns The Canvases of the corresponding image region for each detected face.
 */
export function extractFaces(input, detections) {
    return tslib_1.__awaiter(this, void 0, void 0, function () {
        var Canvas, canvas, netInput, tensorOrCanvas, _a, ctx, boxes;
        return tslib_1.__generator(this, function (_b) {
            switch (_b.label) {
                case 0:
                    Canvas = env.getEnv().Canvas;
                    canvas = input;
                    if (!!(input instanceof Canvas)) return [3 /*break*/, 5];
                    return [4 /*yield*/, toNetInput(input)];
                case 1:
                    netInput = _b.sent();
                    if (netInput.batchSize > 1) {
                        throw new Error('extractFaces - batchSize > 1 not supported');
                    }
                    tensorOrCanvas = netInput.getInput(0);
                    if (!(tensorOrCanvas instanceof Canvas)) return [3 /*break*/, 2];
                    _a = tensorOrCanvas;
                    return [3 /*break*/, 4];
                case 2: return [4 /*yield*/, imageTensorToCanvas(tensorOrCanvas)];
                case 3:
                    _a = _b.sent();
                    _b.label = 4;
                case 4:
                    canvas = _a;
                    _b.label = 5;
                case 5:
                    ctx = getContext2dOrThrow(canvas);
                    boxes = detections.map(function (det) { return det instanceof FaceDetection
                        ? det.forSize(canvas.width, canvas.height).box.floor()
                        : det; })
                        .map(function (box) { return box.clipAtImageBorders(canvas.width, canvas.height); });
                    return [2 /*return*/, boxes.map(function (_a) {
                            var x = _a.x, y = _a.y, width = _a.width, height = _a.height;
                            var faceImg = createCanvas({ width: width, height: height });
                            getContext2dOrThrow(faceImg)
                                .putImageData(ctx.getImageData(x, y, width, height), 0, 0);
                            return faceImg;
                        })];
            }
        });
    });
}
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