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Provide a relative, per-image limit to the amount of memory that's used to cache decoded image frames. Adds an overridable default that developers can set to control how much memory images are allowed to use decoded vs undecoded. The cap is set in flutter/flutter#22452. Note that required frames are always cached regardless of the ratio cap, because they're currently necessary for the GIF to animate. Previously cached unessential frames are not cleared in response to the cache hitting or exceeding the cap. Addresses #20998 and #14344.
117 lines
3.6 KiB
Dart
117 lines
3.6 KiB
Dart
// Copyright 2017 The Chromium 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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import 'dart:async';
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import 'dart:io';
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import 'dart:ui' as ui;
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import 'dart:typed_data';
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import 'package:test/test.dart';
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import 'package:path/path.dart' as path;
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void main() {
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test('Animation metadata', () async {
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Uint8List data = await _getSkiaResource('alphabetAnim.gif').readAsBytes();
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ui.Codec codec = await ui.instantiateImageCodec(data);
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expect(codec, isNotNull);
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expect(codec.frameCount, 13);
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expect(codec.repetitionCount, 0);
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codec.dispose();
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data = await _getSkiaResource('test640x479.gif').readAsBytes();
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codec = await ui.instantiateImageCodec(data);
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expect(codec.frameCount, 4);
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expect(codec.repetitionCount, -1);
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});
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test('Fails with invalid data', () async {
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Uint8List data = new Uint8List.fromList([1, 2, 3]);
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expect(
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ui.instantiateImageCodec(data),
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throwsA(exceptionWithMessage('operation failed'))
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);
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});
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test('nextFrame', () async {
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Uint8List data = await _getSkiaResource('test640x479.gif').readAsBytes();
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ui.Codec codec = await ui.instantiateImageCodec(data);
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List<List<int>> decodedFrameInfos = [];
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for (int i = 0; i < 5; i++) {
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ui.FrameInfo frameInfo = await codec.getNextFrame();
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decodedFrameInfos.add([
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frameInfo.duration.inMilliseconds,
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frameInfo.image.width,
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frameInfo.image.height,
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]);
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}
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expect(decodedFrameInfos, equals([
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[200, 640, 479],
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[200, 640, 479],
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[200, 640, 479],
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[200, 640, 479],
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[200, 640, 479],
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]));
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});
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test('decodedCacheRatioCap', () async {
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// No real way to test the native layer, but a smoke test here to at least
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// verify that animation is still consistent with caching disabled.
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Uint8List data = await _getSkiaResource('test640x479.gif').readAsBytes();
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ui.Codec codec = await ui.instantiateImageCodec(data, decodedCacheRatioCap: 1.0);
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List<List<int>> decodedFrameInfos = [];
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for (int i = 0; i < 5; i++) {
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ui.FrameInfo frameInfo = await codec.getNextFrame();
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decodedFrameInfos.add([
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frameInfo.duration.inMilliseconds,
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frameInfo.image.width,
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frameInfo.image.height,
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]);
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}
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expect(decodedFrameInfos, equals([
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[200, 640, 479],
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[200, 640, 479],
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[200, 640, 479],
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[200, 640, 479],
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[200, 640, 479],
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]));
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});
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test('non animated image', () async {
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Uint8List data = await _getSkiaResource('baby_tux.png').readAsBytes();
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ui.Codec codec = await ui.instantiateImageCodec(data);
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List<List<int>> decodedFrameInfos = [];
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for (int i = 0; i < 2; i++) {
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ui.FrameInfo frameInfo = await codec.getNextFrame();
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decodedFrameInfos.add([
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frameInfo.duration.inMilliseconds,
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frameInfo.image.width,
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frameInfo.image.height,
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]);
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}
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expect(decodedFrameInfos, equals([
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[0, 240, 246],
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[0, 240, 246],
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]));
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});
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}
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/// Returns a File handle to a file in the skia/resources directory.
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File _getSkiaResource(String fileName) {
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// As Platform.script is not working for flutter_tester
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// (https://github.com/flutter/flutter/issues/12847), this is currently
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// assuming the curent working directory is engine/src.
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// This is fragile and should be changed once the Platform.script issue is
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// resolved.
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String assetPath =
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path.join('third_party', 'skia', 'resources', 'images', fileName);
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return new File(assetPath);
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}
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Matcher exceptionWithMessage(String m) {
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return predicate((e) {
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return e is Exception && e.toString().contains(m);
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});
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}
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