@ngageoint/geopackage/dist/lib/canvas/offscreenCanvasAdapter.js

GeoPackage JavaScript Library

"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
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var __generator = (this && this.__generator) || function (thisArg, body) {
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};
Object.defineProperty(exports, "__esModule", { value: true });
exports.OffscreenCanvasAdapter = void 0;
var canvasUtils_1 = require("./canvasUtils");
/**
 * OffscreenCanvas canvas adapter. This can only run inside a web worker.
 */
var OffscreenCanvasAdapter = /** @class */ (function () {
    function OffscreenCanvasAdapter() {
    }
    OffscreenCanvasAdapter.prototype.initialize = function () {
        return new Promise(function (resolve) {
            OffscreenCanvasAdapter.initialized = true;
            resolve();
        });
    };
    OffscreenCanvasAdapter.prototype.isInitialized = function () {
        return OffscreenCanvasAdapter.initialized;
    };
    OffscreenCanvasAdapter.prototype.create = function (width, height) {
        return new OffscreenCanvas(width, height);
    };
    OffscreenCanvasAdapter.prototype.createImage = function (data, contentType) {
        if (contentType === void 0) { contentType = 'image/png'; }
        return new Promise(function (resolve, reject) {
            var blob = data;
            if (data instanceof Buffer || Object.prototype.toString.call(data) === '[object Uint8Array]') {
                blob = new Blob([data], { type: contentType });
            }
            else if (typeof data === 'string') {
                blob = new Blob([canvasUtils_1.CanvasUtils.base64toUInt8Array(data.split(',')[1])], { type: contentType });
            }
            createImageBitmap(blob).then(function (image) {
                resolve({
                    image: image,
                    width: image.width,
                    height: image.height,
                });
            }).catch(function (error) {
                reject(error);
            });
        });
    };
    OffscreenCanvasAdapter.prototype.createImageData = function (width, height) {
        return new ImageData(width, height);
    };
    OffscreenCanvasAdapter.prototype.disposeCanvas = function (canvas) {
        canvas = null;
    };
    OffscreenCanvasAdapter.prototype.measureText = function (context, fontFace, fontSize, text) {
        context.save();
        context.font = fontSize + 'px' + (fontFace != null ? (' \'' + fontFace + '\'') : '');
        context.textBaseline = 'middle';
        context.textAlign = 'center';
        var width = context.measureText(text).width;
        context.restore();
        return width;
    };
    OffscreenCanvasAdapter.prototype.drawText = function (context, text, location, fontFace, fontSize, fontColor) {
        context.save();
        context.font = fontSize + 'px' + (fontFace != null ? (' \'' + fontFace + '\'') : '');
        context.fillStyle = fontColor;
        context.textBaseline = 'middle';
        context.textAlign = 'center';
        context.fillText(text, location[0], location[1]);
        context.restore();
    };
    OffscreenCanvasAdapter.prototype.scaleImage = function (image, scale) {
        return __awaiter(this, void 0, void 0, function () {
            var scaledWidth, scaledHeight;
            return __generator(this, function (_a) {
                if (scale === 1.0) {
                    return [2 /*return*/, image];
                }
                scaledWidth = Math.round(scale * image.width);
                scaledHeight = Math.round(scale * image.height);
                return [2 /*return*/, this.scaleImageToDimensions(image, scaledWidth, scaledHeight)];
            });
        });
    };
    OffscreenCanvasAdapter.prototype.scaleImageToDimensions = function (image, scaledWidth, scaledHeight) {
        return __awaiter(this, void 0, void 0, function () {
            var canvas, ctx, result;
            return __generator(this, function (_a) {
                canvas = this.create(scaledWidth, scaledHeight);
                ctx = canvas.getContext('2d');
                ctx.drawImage(image.image, 0, 0, scaledWidth, scaledHeight);
                result = {
                    image: canvas.transferToImageBitmap(),
                    width: scaledWidth,
                    height: scaledHeight
                };
                this.disposeCanvas(canvas);
                return [2 /*return*/, result];
            });
        });
    };
    OffscreenCanvasAdapter.prototype.toDataURL = function (canvas, format) {
        if (format === void 0) { format = 'image/png'; }
        // @ts-ignore
        return new Promise(function (resolve) {
            canvas.convertToBlob({ type: format }).then(function (blob) {
                var reader = new FileReader();
                reader.addEventListener('load', function () {
                    var result = reader.result;
                    resolve(result);
                });
                reader.readAsDataURL(blob);
            });
        });
    };
    OffscreenCanvasAdapter.prototype.disposeImage = function (image) {
    };
    OffscreenCanvasAdapter.initialized = false;
    return OffscreenCanvasAdapter;
}());
exports.OffscreenCanvasAdapter = OffscreenCanvasAdapter;
//# sourceMappingURL=offscreenCanvasAdapter.js.map