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4be3a031b6
* reuse images across frames * Change implementation to CrossFrameCache at picture level * Update licenses_flutter
77 lines
2.8 KiB
Dart
77 lines
2.8 KiB
Dart
// Copyright 2013 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// @dart = 2.6
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import 'package:ui/src/engine.dart';
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import 'package:test/test.dart';
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void main() {
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group('CrossFrameCache', () {
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test('Reuse returns no object when cache empty', () {
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final CrossFrameCache<TestItem> cache = CrossFrameCache();
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cache.commitFrame();
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TestItem requestedItem = cache.reuse('item1');
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expect(requestedItem, null);
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});
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test('Reuses object across frames', () {
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final CrossFrameCache<TestItem> cache = CrossFrameCache();
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final TestItem testItem1 = TestItem('item1');
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cache.cache(testItem1.label, testItem1);
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cache.commitFrame();
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TestItem requestedItem = cache.reuse('item1');
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expect(requestedItem, testItem1);
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requestedItem = cache.reuse('item1');
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expect(requestedItem, null);
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});
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test('Reuses objects that have same key across frames', () {
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final CrossFrameCache<TestItem> cache = CrossFrameCache();
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final TestItem testItem1 = TestItem('sameLabel');
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final TestItem testItem2 = TestItem('sameLabel');
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final TestItem testItemX = TestItem('X');
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cache.cache(testItem1.label, testItem1);
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cache.cache(testItemX.label, testItemX);
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cache.cache(testItem2.label, testItem2);
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cache.commitFrame();
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TestItem requestedItem = cache.reuse('sameLabel');
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expect(requestedItem, testItem1);
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requestedItem = cache.reuse('sameLabel');
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expect(requestedItem, testItem2);
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requestedItem = cache.reuse('sameLabel');
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expect(requestedItem, null);
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});
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test('Values don\'t survive beyond next frame', () {
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final CrossFrameCache<TestItem> cache = CrossFrameCache();
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final TestItem testItem1 = TestItem('item1');
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cache.cache(testItem1.label, testItem1);
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cache.commitFrame();
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cache.commitFrame();
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TestItem requestedItem = cache.reuse('item1');
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expect(requestedItem, null);
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});
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test('Values are evicted when not reused', () {
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final Set<TestItem> _evictedItems = {};
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final CrossFrameCache<TestItem> cache = CrossFrameCache();
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final TestItem testItem1 = TestItem('item1');
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final TestItem testItem2 = TestItem('item2');
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cache.cache(testItem1.label, testItem1, (TestItem item) {_evictedItems.add(item);});
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cache.cache(testItem2.label, testItem2, (TestItem item) {_evictedItems.add(item);});
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cache.commitFrame();
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expect(_evictedItems.length, 0);
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cache.reuse('item2');
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cache.commitFrame();
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expect(_evictedItems.contains(testItem1), true);
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expect(_evictedItems.contains(testItem2), false);
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});
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});
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}
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class TestItem {
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final String label;
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TestItem(this.label);
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}
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