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1// Copyright 2014 Google Inc. All rights reserved.
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7// http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15(function(scope, testing) {
16
17 var canvas = document.createElementNS('http://www.w3.org/1999/xhtml', 'canvas');
18 canvas.width = canvas.height = 1;
19 var context = canvas.getContext('2d');
20
21 function parseColor(string) {
22 string = string.trim();
23 // The context ignores invalid colors
24 context.fillStyle = '#000';
25 context.fillStyle = string;
26 var contextSerializedFillStyle = context.fillStyle;
27 context.fillStyle = '#fff';
28 context.fillStyle = string;
29 if (contextSerializedFillStyle != context.fillStyle)
30 return;
31 context.fillRect(0, 0, 1, 1);
32 var pixelColor = context.getImageData(0, 0, 1, 1).data;
33 context.clearRect(0, 0, 1, 1);
34 var alpha = pixelColor[3] / 255;
35 return [pixelColor[0] * alpha, pixelColor[1] * alpha, pixelColor[2] * alpha, alpha];
36 }
37
38 function mergeColors(left, right) {
39 return [left, right, function(x) {
40 function clamp(v) {
41 return Math.max(0, Math.min(255, v));
42 }
43 if (x[3]) {
44 for (var i = 0; i < 3; i++)
45 x[i] = Math.round(clamp(x[i] / x[3]));
46 }
47 x[3] = scope.numberToString(scope.clamp(0, 1, x[3]));
48 return 'rgba(' + x.join(',') + ')';
49 }];
50 }
51
52 scope.addPropertiesHandler(parseColor, mergeColors,
53 ['background-color', 'border-bottom-color', 'border-left-color', 'border-right-color',
54 'border-top-color', 'color', 'fill', 'flood-color', 'lighting-color',
55 'outline-color', 'stop-color', 'stroke', 'text-decoration-color']);
56 scope.consumeColor = scope.consumeParenthesised.bind(null, parseColor);
57 scope.mergeColors = mergeColors;
58
59 if (WEB_ANIMATIONS_TESTING) {
60 testing.parseColor = parseColor;
61 }
62
63})(webAnimations1, webAnimationsTesting);