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deaf14ec7d
This change converts all Float64List matrices to Float32List at the dart:ui interface boundary. Internally, it only uses Float32List. Float32List requires less memory and is orders of magnitude faster to allocate, and it has sufficient precision as Flutter mobile engine and Skia use 32-bit floats anyway. This change speeds up frame preroll by 50% on the bench_card_infinite_scroll benchmark. For more details on Float64Array allocation in JS (which backs Float64List in Dart) see the following: https://bugs.chromium.org/p/v8/issues/detail?id=9199 https://bugs.chromium.org/p/v8/issues/detail?id=2022
40 lines
1.7 KiB
Dart
40 lines
1.7 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:typed_data';
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import 'package:ui/src/engine.dart';
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import 'package:test/test.dart';
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final Float32List identityTransform = Matrix4.identity().storage;
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final Float32List xTranslation = (Matrix4.identity()..translate(10)).storage;
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final Float32List yTranslation = (Matrix4.identity()..translate(0, 10)).storage;
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final Float32List zTranslation = (Matrix4.identity()..translate(0, 0, 10)).storage;
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final Float32List scaleAndTranslate2d = (Matrix4.identity()..scale(2, 3, 1)..translate(4, 5, 0)).storage;
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final Float32List rotation2d = (Matrix4.identity()..rotateZ(0.2)).storage;
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void main() {
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test('transformKindOf and isIdentityFloat32ListTransform identify matrix kind', () {
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expect(transformKindOf(identityTransform), TransformKind.identity);
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expect(isIdentityFloat32ListTransform(identityTransform), isTrue);
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expect(transformKindOf(zTranslation), TransformKind.complex);
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expect(isIdentityFloat32ListTransform(zTranslation), isFalse);
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expect(transformKindOf(xTranslation), TransformKind.transform2d);
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expect(isIdentityFloat32ListTransform(xTranslation), isFalse);
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expect(transformKindOf(yTranslation), TransformKind.transform2d);
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expect(isIdentityFloat32ListTransform(yTranslation), isFalse);
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expect(transformKindOf(scaleAndTranslate2d), TransformKind.transform2d);
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expect(isIdentityFloat32ListTransform(scaleAndTranslate2d), isFalse);
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expect(transformKindOf(rotation2d), TransformKind.transform2d);
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expect(isIdentityFloat32ListTransform(rotation2d), isFalse);
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});
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}
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