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chenyc

2025-06-12 7b72ac13a83764a662159d4a49b7fffb90476ecb

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/**
 * @license
 * Copyright 2018 Google LLC. All Rights Reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * =============================================================================
 */
import * as tf from './index';
import { ALL_ENVS, describeWithFlags } from './jasmine_util';
function isFloat(num) {
    return num % 1 !== 0;
}
describeWithFlags('nextFrame', ALL_ENVS, () => {
    it('basic usage', async () => {
        const t0 = tf.util.now();
        await tf.nextFrame();
        const t1 = tf.util.now();
        // tf.nextFrame may take no more than 1ms to complete, so this test is
        // meaningful only if the precision of tf.util.now is better than 1ms.
        // After version 59, the precision of Firefox's tf.util.now becomes 2ms by
        // default for security issues, https://caniuse.com/?search=performance.now.
        // Then, this test is dropped for Firefox, even though it could be
        // set to better precision through browser setting,
        // https://github.com/lumen/threading-benchmarks/issues/7.
        if (isFloat(t0) || isFloat(t1)) {
            // If t0 or t1 have decimal point, it means the precision is better than
            // 1ms.
            expect(t1).toBeGreaterThan(t0);
        }
    });
    it('does not block timers', async () => {
        let flag = false;
        setTimeout(() => {
            flag = true;
        }, 50);
        const t0 = tf.util.now();
        expect(flag).toBe(false);
        while (tf.util.now() - t0 < 1000 && !flag) {
            await tf.nextFrame();
        }
        expect(flag).toBe(true);
    });
});
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