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); 64