| // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file |
| |
| // @dart = 2.9 |
| |
| import 'dart:html'; |
| import 'dart:typed_data'; |
| |
| import 'package:expect/minitest.dart'; |
| |
| // We have aliased the legacy type CanvasPixelArray with the new type |
| // Uint8ClampedArray by mapping the CanvasPixelArray type tag to |
| // Uint8ClampedArray. It is not a perfect match since CanvasPixelArray is |
| // missing the ArrayBufferView members. These should appear to be null. |
| |
| var inscrutable; |
| |
| main() { |
| inscrutable = (x) => x; |
| |
| int width = 100; |
| int height = 100; |
| |
| CanvasElement canvas = new CanvasElement(width: width, height: height); |
| document.body.append(canvas); |
| |
| CanvasRenderingContext2D context = canvas.context2D; |
| |
| group('basic', () { |
| test('CreateImageData', () { |
| ImageData image = context.createImageData(canvas.width, canvas.height); |
| List<int> data = image.data; |
| // It is legal for the dart2js compiler to believe the type of the native |
| // ImageData.data and elides the check, so check the type explicitly: |
| expect(inscrutable(data) is List<int>, isTrue, |
| reason: 'canvas array type'); |
| |
| expect(data.length, 40000); |
| checkPixel(data, 0, [0, 0, 0, 0]); |
| checkPixel(data, width * height - 1, [0, 0, 0, 0]); |
| |
| data[100] = 200; |
| expect(data[100], equals(200)); |
| }); |
| }); |
| |
| group('types1', () { |
| test('isList', () { |
| var data = context.createImageData(canvas.width, canvas.height).data; |
| expect(inscrutable(data) is List, true); |
| }); |
| |
| test('isListT_pos', () { |
| var data = context.createImageData(canvas.width, canvas.height).data; |
| expect(inscrutable(data) is List<int>, true); |
| }); |
| }); |
| |
| group('types2', () { |
| test('isListT_neg', () { |
| var data = context.createImageData(canvas.width, canvas.height).data; |
| expect(inscrutable(data) is List<String>, false); |
| }); |
| |
| test('isUint8ClampedList', () { |
| var data = context.createImageData(canvas.width, canvas.height).data; |
| expect(inscrutable(data) is Uint8ClampedList, true); |
| }); |
| |
| test('consistent_isUint8ClampedList', () { |
| var data = context.createImageData(canvas.width, canvas.height).data; |
| // Static and dynamic values consistent? Type inference should be able to |
| // constant-fold 'data is Uint8ClampedList' to 'true'. |
| expect(inscrutable(data) is Uint8ClampedList == data is Uint8ClampedList, |
| isTrue); |
| }); |
| |
| // TODO(sra): Why does this fail on Dartium? There are two types with the |
| // same print string: |
| // |
| // Expected: ?:<Uint8ClampedList> Actual: ?:<Uint8ClampedList> |
| /* |
| test('runtimeType', () { |
| var data = context.createImageData(canvas.width, canvas.height).data; |
| expect(inscrutable(data).runtimeType, Uint8ClampedList); |
| }); |
| */ |
| |
| test('consistent_runtimeType', () { |
| var data = context.createImageData(canvas.width, canvas.height).data; |
| expect(inscrutable(data).runtimeType == data.runtimeType, isTrue); |
| }); |
| }); |
| |
| group('types2_runtimeTypeName', () { |
| test('runtimeTypeName', () { |
| var data = context.createImageData(canvas.width, canvas.height).data; |
| expect('${inscrutable(data).runtimeType}', 'Uint8ClampedList'); |
| }); |
| }); |
| |
| group('typed_data', () { |
| test('elementSizeInBytes', () { |
| var data = context.createImageData(canvas.width, canvas.height).data; |
| expect(inscrutable(data).elementSizeInBytes, 1); |
| }); |
| }); |
| } |
| |
| void checkPixel(List<int> data, int offset, List<int> rgba) { |
| offset *= 4; |
| for (var i = 0; i < 4; ++i) { |
| expect(rgba[i], equals(data[offset + i])); |
| } |
| } |