79 lines
2.4 KiB
JavaScript
79 lines
2.4 KiB
JavaScript
/* Copyright 2017 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import { PredictorStream, Stream } from "../../src/core/stream.js";
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import { Dict } from "../../src/core/primitives.js";
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describe("stream", function () {
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beforeEach(function () {
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jasmine.addMatchers({
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toMatchTypedArray(util, customEqualityTesters) {
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return {
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compare(actual, expected) {
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const result = {};
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if (actual.length !== expected.length) {
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result.pass = false;
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result.message =
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"Array length: " +
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actual.length +
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", expected: " +
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expected.length;
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return result;
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}
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result.pass = true;
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for (let i = 0, ii = expected.length; i < ii; i++) {
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const a = actual[i],
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b = expected[i];
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if (a !== b) {
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result.pass = false;
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break;
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}
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}
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return result;
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},
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};
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},
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});
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});
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describe("PredictorStream", function () {
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it("should decode simple predictor data", function () {
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const dict = new Dict();
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dict.set("Predictor", 12);
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dict.set("Colors", 1);
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dict.set("BitsPerComponent", 8);
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dict.set("Columns", 2);
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const input = new Stream(
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new Uint8Array([2, 100, 3, 2, 1, 255, 2, 1, 255]),
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0,
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9,
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dict
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);
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const predictor = new PredictorStream(input, /* length = */ 9, dict);
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const result = predictor.getBytes(6);
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expect(result).toMatchTypedArray(
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new Uint8Array([100, 3, 101, 2, 102, 1])
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);
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predictor.reset();
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const clampedResult = predictor.getBytes(6, /* forceClamped = */ true);
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expect(clampedResult).toEqual(
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new Uint8ClampedArray([100, 3, 101, 2, 102, 1])
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);
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});
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});
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});
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