| #library('CanvasTest'); |
| #import('../../pkg/unittest/unittest.dart'); |
| #import('../../pkg/unittest/html_config.dart'); |
| #import('dart:html'); |
| |
| main() { |
| CanvasElement canvas; |
| CanvasRenderingContext2D context; |
| int width = 100; |
| int height = 100; |
| |
| canvas = new Element.tag('canvas'); |
| canvas.attributes['width'] = width; |
| canvas.attributes['height'] = height; |
| document.body.nodes.add(canvas); |
| |
| context = canvas.context2d; |
| |
| useHtmlConfiguration(); |
| test('CreateImageData', () { |
| ImageData image = context.createImageData(canvas.width, |
| canvas.height); |
| Uint8ClampedArray data = image.data; |
| |
| expect(data, hasLength(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)); |
| }); |
| } |
| |
| void checkPixel(Uint8ClampedArray data, int offset, List<int> rgba) |
| { |
| offset *= 4; |
| for (var i = 0; i < 4; ++i) { |
| expect(data[offset + i], equals(rgba[i])); |
| } |
| } |