blob: dd3910f69ec4234367048e9e99b0ca0644c3d4ab [file] [log] [blame]
// Copyright (c) 2020, 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.
library CanvasTest;
import 'dart:html';
import 'package:async_helper/async_minitest.dart';
main() {
CanvasElement canvas;
CanvasRenderingContext2D context;
int width = 100;
int height = 100;
canvas = new CanvasElement(width: width, height: height);
document.body!.append(canvas);
context = canvas.context2D;
test('CreateImageData', () {
ImageData image = context.createImageData(canvas.width, canvas.height);
List<int> data = image.data;
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));
});
test('toDataUrl', () {
var canvas = new CanvasElement(width: 100, height: 100);
var context = canvas.context2D;
context.fillStyle = 'red';
context.fill();
var url = canvas.toDataUrl();
var img = new ImageElement();
img.onLoad.listen(expectAsync((_) {
expect(img.complete, true);
}));
img.onError.listen((_) {
fail('URL failed to load.');
});
img.src = url;
});
}
void checkPixel(List<int> data, int offset, List<int> rgba) {
offset *= 4;
for (var i = 0; i < 4; ++i) {
expect(data[offset + i], equals(rgba[i]));
}
}