blob: c1392f8b3e37278c6755c6be615705c3638bcee8 [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.
*/
import "dart:html";
import "dart:math" as Math;
import "../../testcommon.dart";
import "../../../Utils/async_utils.dart";
main() {
var tmpimg = document.createElement('canvas');
tmpimg.width = 200;
tmpimg.height = 200;
var ctx = tmpimg.getContext('2d');
// Create the image for blending test with images.
var img = document.createElement('canvas');
img.width = 200;
img.height = 200;
var imgCtx = img.getContext('2d');
imgCtx.fillStyle = "red";
imgCtx.fillRect(0,0,100,100);
imgCtx.fillStyle = "yellow";
imgCtx.fillRect(100,0,100,100);
imgCtx.fillStyle = "green";
imgCtx.fillRect(100,100,100,100);
imgCtx.fillStyle = "blue";
imgCtx.fillRect(0,100,100,100);
// Create expected results.
var blendModes =
// [blendMode, expectations solid on solid, expectations solid on alpha, expectations alpha on solid, expectations alpha on alpha]
[
['source-over',
[[255, 0, 0, 255],[255, 255, 0, 255],[0, 128, 0, 255],[0, 0, 255, 255]],
[[128, 0, 127, 255],[128, 128, 127, 255],[0, 64, 127, 255],[0, 0, 255, 255]],
[[255, 0, 0, 255],[255, 255, 0, 255],[0, 128, 0, 255],[0, 0, 255, 255]],
[[171, 0, 84, 191],[171, 171, 84, 191],[0, 85, 84, 191],[0, 0, 255, 191]]
],
['multiply',
[[0, 0, 0, 255],[0, 0, 0, 255],[0, 0, 0, 255],[0, 0, 255, 255]],
[[0, 0, 127, 255],[0, 0, 127, 255],[0, 0, 127, 255],[0, 0, 255, 255]],
[[128, 0, 0, 255],[128, 128, 0, 255],[0, 64, 0, 255],[0, 0, 255, 255]],
[[85, 0, 84, 191],[85, 85, 84, 191],[0, 43, 84, 191],[0, 0, 255, 191]]
],
['screen',
[[255, 0, 255, 255],[255, 255, 255, 255],[0, 128, 255, 255],[0, 0, 255, 255]],
[[128, 0, 255, 255],[128, 128, 255, 255],[0, 64, 255, 255],[0, 0, 255, 255]],
[[255, 0, 127, 255],[255, 255, 127, 255],[0, 128, 127, 255],[0, 0, 255, 255]],
[[171, 0, 170, 191],[171, 171, 170, 191],[0, 85, 170, 191],[0, 0, 255, 191]]
],
['overlay',
[[0, 0, 255, 255],[0, 0, 255, 255],[0, 0, 255, 255],[0, 0, 255, 255]],
[[0, 0, 255, 255],[0, 0, 255, 255],[0, 0, 255, 255],[0, 0, 255, 255]],
[[128, 0, 127, 255],[128, 128, 127, 255],[0, 64, 127, 255],[0, 0, 255, 255]],
[[85, 0, 170, 191],[85, 85, 170, 191],[0, 43, 170, 191],[0, 0, 255, 191]]
],
['darken',
[[0, 0, 0, 255],[0, 0, 0, 255],[0, 0, 0, 255],[0, 0, 255, 255]],
[[0, 0, 127, 255],[0, 0, 127, 255],[0, 0, 127, 255],[0, 0, 255, 255]],
[[128, 0, 0, 255],[128, 128, 0, 255],[0, 64, 0, 255],[0, 0, 255, 255]],
[[85, 0, 84, 191],[85, 85, 84, 191],[0, 43, 84, 191],[0, 0, 255, 191]]
],
['lighten',
[[255, 0, 255, 255],[255, 255, 255, 255],[0, 128, 255, 255],[0, 0, 255, 255]],
[[128, 0, 255, 255],[128, 128, 255, 255],[0, 64, 255, 255],[0, 0, 255, 255]],
[[255, 0, 127, 255],[255, 255, 127, 255],[0, 128, 127, 255],[0, 0, 255, 255]],
[[171, 0, 170, 191],[171, 171, 170, 191],[0, 85, 170, 191],[0, 0, 255, 191]]
],
['color-dodge',
[[0, 0, 255, 255],[0, 0, 255, 255],[0, 0, 255, 255],[0, 0, 255, 255]],
[[0, 0, 255, 255],[0, 0, 255, 255],[0, 0, 255, 255],[0, 0, 255, 255]],
[[128, 0, 127, 255],[128, 128, 127, 255],[0, 64, 127, 255],[0, 0, 255, 255]],
[[85, 0, 170, 191],[85, 85, 170, 191],[0, 43, 170, 191],[0, 0, 255, 191]]
],
['color-burn',
[[0, 0, 255, 255],[0, 0, 255, 255],[0, 0, 255, 255],[0, 0, 255, 255]],
[[0, 0, 255, 255],[0, 0, 255, 255],[0, 0, 255, 255],[0, 0, 255, 255]],
[[128, 0, 127, 255],[128, 128, 127, 255],[0, 64, 127, 255],[0, 0, 255, 255]],
[[85, 0, 170, 191],[85, 85, 170, 191],[0, 42, 170, 191],[0, 0, 255, 191]]
],
['hard-light',
[[255, 0, 0, 255],[255, 255, 0, 255],[0, 1, 0, 255],[0, 0, 255, 255]],
[[128, 0, 127, 255],[128, 128, 127, 255],[0, 0, 127, 255],[0, 0, 255, 255]],
[[255, 0, 0, 255],[255, 255, 0, 255],[0, 65, 0, 255],[0, 0, 255, 255]],
[[171, 0, 84, 191],[171, 171, 84, 191],[0, 43, 84, 191],[0, 0, 255, 191]]
],
['soft-light',
[[0, 0, 255, 255],[0, 0, 255, 255],[0, 0, 255, 255],[0, 0, 255, 255]],
[[0, 0, 255, 255],[0, 0, 255, 255],[0, 0, 255, 255],[0, 0, 255, 255]],
[[128, 0, 127, 255],[128, 128, 127, 255],[0, 64, 127, 255],[0, 0, 255, 255]],
[[85, 0, 170, 191],[85, 85, 170, 191],[0, 43, 170, 191],[0, 0, 255, 191]]
],
['difference',
[[255, 0, 255, 255],[255, 255, 255, 255],[0, 128, 255, 255],[0, 0, 0, 255]],
[[128, 0, 255, 255],[128, 128, 255, 255],[0, 64, 255, 255],[0, 0, 127, 255]],
[[255, 0, 127, 255],[255, 255, 127, 255],[0, 128, 127, 255],[0, 0, 128, 255]],
[[171, 0, 170, 191],[171, 171, 170, 191],[0, 85, 170, 191],[0, 0, 171, 191]]
],
['exclusion',
[[255, 0, 255, 255],[255, 255, 255, 255],[0, 128, 255, 255],[0, 0, 0, 255]],
[[128, 0, 255, 255],[128, 128, 255, 255],[0, 64, 255, 255],[0, 0, 127, 255]],
[[255, 0, 127, 255],[255, 255, 127, 255],[0, 128, 127, 255],[0, 0, 128, 255]],
[[171, 0, 170, 191],[171, 171, 170, 191],[0, 85, 170, 191],[0, 0, 171, 191]]
],
['hue',
[[93, 0, 0, 255],[31, 31, 0, 255],[0, 46, 0, 255],[0, 0, 255, 255]],
[[49, 0, 127, 255],[16, 16, 127, 255],[0, 25, 127, 255],[0, 0, 255, 255]],
[[175, 0, 0, 255],[144, 144, 0, 255],[0, 88, 0, 255],[0, 0, 255, 255]],
[[116, 0, 84, 191],[96, 96, 84, 191],[0, 58, 84, 191],[0, 0, 255, 191]]
],
['saturation',
[[0, 0, 255, 255],[0, 0, 255, 255],[14, 14, 142, 255],[0, 0, 255, 255]],
[[0, 0, 255, 255],[0, 0, 255, 255],[7, 7, 198, 255],[0, 0, 255, 255]],
[[128, 0, 127, 255],[128, 128, 127, 255],[7, 71, 70, 255],[0, 0, 255, 255]],
[[85, 0, 167, 191],[85, 85, 167, 191],[0, 48, 130, 191],[0, 0, 255, 191]]
],
['color',
[[93, 0, 0, 255],[31, 31, 0, 255],[0, 47, 0, 255],[0, 0, 255, 255]],
[[49, 0, 127, 255],[16, 16, 127, 255],[0, 24, 127, 255],[0, 0, 255, 255]],
[[175, 0, 0, 255],[144, 144, 0, 255],[0, 88, 0, 255],[0, 0, 255, 255]],
[[116, 0, 84, 191],[96, 96, 84, 191],[0, 58, 84, 191],[0, 0, 255, 191]]
],
['luminosity',
[[55, 55, 255, 255],[224, 224, 255, 255],[54, 54, 255, 255],[0, 0, 255, 255]],
[[28, 28, 255, 255],[112, 112, 255, 255],[27, 27, 255, 255],[0, 0, 255, 255]],
[[155, 27, 127, 255],[239, 239, 127, 255],[26, 90, 127, 255],[0, 0, 255, 255]],
[[104, 19, 167, 191],[158, 158, 167, 191],[16, 58, 167, 191],[0, 0, 255, 191]]
]];
// [Scenario, alpha on background, alpha on foreground]
var testScenario = [
['solid on solid', 1, 1],
['solid on alpha', 1, 0.5],
['alpha on solid', 0.5, 1],
['alpha on alpha', 0.5, 0.5]
];
var testPoints = [{'x': 50, 'y': 50}, {'x': 150, 'y': 50}, {'x': 150, 'y': 150}, {'x': 50, 'y': 150}];
pixelDataAtPoint(i) {
return ctx.getImageData(testPoints[i]['x'], testPoints[i]['y'] , 1, 1).data;
}
checkBlendModeResult(blendMode, testScenario, expectedColors, sigma) {
debug(testScenario);
for (var i = 0; i < testPoints.length; i++) {
var resultColor = pixelDataAtPoint(i);
shouldBeCloseTo(resultColor[0], expectedColors[i][0], sigma);
shouldBeCloseTo(resultColor[1], expectedColors[i][1], sigma);
shouldBeCloseTo(resultColor[2], expectedColors[i][2], sigma);
shouldBeCloseTo(resultColor[3], expectedColors[i][3], sigma);
}
}
// Execute test.
prepareTestScenario(sigma) {
// Check each blend mode individually.
for (var i = 0; i < blendModes.length; i++) {
debug('Testing blend mode ${blendModes[i][0]}');
for (var j = 0; j < testScenario.length; j++) {
ctx.clearRect(0,0,200,200);
ctx.save();
// Draw backdrop.
ctx.fillStyle = 'rgba(0, 0, 255, ${testScenario[j][1]})';
ctx.fillRect(0,0,200,200);
// Apply blend mode.
ctx.globalCompositeOperation = blendModes[i][0];
ctx.globalAlpha = testScenario[j][2];
ctx.drawImage(img, 0, 0);
checkBlendModeResult(blendModes[i][0], testScenario[j][0], blendModes[i][j+1], sigma);
ctx.restore();
}
debug('');
}
}
// Run test and allow variation of results.
prepareTestScenario(5);
}