blob: ea73668ff90a042e34ef38a1420cf11836bb945a [file] [log] [blame]
/*
* Copyright (c) 2014, 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.
*/
/**
* @description Series of tests to ensure correct results on applying different
* blend modes when drawing a rectangle on top of a gradient.
*/
import "dart:html";
import "dart:math" as Math;
import "../../testcommon.dart";
import "../../../Utils/async_utils.dart";
import "canvas-blending-helpers.dart";
main() {
var context;
actualColor(x, y) {
return context.getImageData(x, y, 1, 1).data;
}
checkBlendModeResult(i, context, sigma) {
var expectedColor = blendColors([129 / 255, 1, 129 / 255, 1], [1, 129 / 255, 129 / 255, 1], i);
var ac = actualColor(0, 0);
shouldBeCloseTo(ac[0], expectedColor[0], sigma);
shouldBeCloseTo(ac[1], expectedColor[1], sigma);
shouldBeCloseTo(ac[2], expectedColor[2], sigma);
shouldBeCloseTo(ac[3], expectedColor[3], sigma);
}
runTest() {
var canvas = document.createElement("canvas");
var sigma = 5;
canvas.width = 10;
canvas.height = 10;
context = canvas.getContext("2d");
for (var i = 0; i < blendModes.length; ++i) {
debug("Testing blend mode " + blendModes[i]);
context.clearRect(0, 0, 10, 10);
context.save();
drawBackdropColorGradientInContext(context);
context.globalCompositeOperation = blendModes[i];
drawSourceColorInContext(context);
checkBlendModeResult(i, context, sigma);
context.restore();
debug('');
}
}
initHelpers();
runTest();
}