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5281322421
Refactors instantiateImageCodec and decodeImageFromPixels to provide intermediate data about the image width, height, and bytes per pixel. This allows for more fine grained control from Dart, particularly when trying to reason about how or whether to maintain aspect ratio in the targetWidth/targetHeight parameters. This leaves the existing methods functional by re-implementing them to use the new ImmutableBuffer/ImageDescriptor class. The ImmutableBuffer class is provided so that callers can avoid copying the image data multiple times if they wish to re-recreate the image descriptor. Related Issues
94 lines
3.0 KiB
Dart
94 lines
3.0 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 'dart:io';
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import 'dart:typed_data';
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import 'dart:ui' as ui;
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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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final Uint8List data = Uint8List.fromList(<int>[1, 2, 3]);
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expect(
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() => ui.instantiateImageCodec(data),
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throwsA(exceptionWithMessage('Invalid image data'))
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);
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});
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test('nextFrame', () async {
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final Uint8List data = await _getSkiaResource('test640x479.gif').readAsBytes();
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final ui.Codec codec = await ui.instantiateImageCodec(data);
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final List<List<int>> decodedFrameInfos = <List<int>>[];
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for (int i = 0; i < 5; i++) {
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final ui.FrameInfo frameInfo = await codec.getNextFrame();
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decodedFrameInfos.add(<int>[
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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(<List<int>>[
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<int>[200, 640, 479],
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<int>[200, 640, 479],
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<int>[200, 640, 479],
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<int>[200, 640, 479],
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<int>[200, 640, 479],
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]));
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});
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test('non animated image', () async {
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final Uint8List data = await _getSkiaResource('baby_tux.png').readAsBytes();
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final ui.Codec codec = await ui.instantiateImageCodec(data);
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final List<List<int>> decodedFrameInfos = <List<int>>[];
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for (int i = 0; i < 2; i++) {
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final ui.FrameInfo frameInfo = await codec.getNextFrame();
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decodedFrameInfos.add(<int>[
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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(<List<int>>[
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<int>[0, 240, 246],
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<int>[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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final String assetPath =
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path.join('third_party', 'skia', 'resources', 'images', fileName);
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return File(assetPath);
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}
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Matcher exceptionWithMessage(String m) {
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return predicate<Exception>((Exception 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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