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third_party/polymer/components/web-animations-js/src/keyframe-interpolations.js

Index: third_party/polymer/components/web-animations-js/src/keyframe-interpolations.js
diff --git a/third_party/polymer/components/web-animations-js/src/keyframe-interpolations.js b/third_party/polymer/components/web-animations-js/src/keyframe-interpolations.js
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+// Copyright 2014 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+//     You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//     See the License for the specific language governing permissions and
+// limitations under the License.
+
+(function(shared, scope, testing) {
+
+  scope.convertEffectInput = function(effectInput) {
+    var keyframes = shared.normalizeKeyframes(effectInput);
+    var propertySpecificKeyframeGroups = makePropertySpecificKeyframeGroups(keyframes);
+    var interpolations = makeInterpolations(propertySpecificKeyframeGroups);
+    return function(target, fraction) {
+      if (fraction != null) {
+        interpolations.filter(function(interpolation) {
+          return fraction >= interpolation.applyFrom && fraction < interpolation.applyTo;
+        }).forEach(function(interpolation) {
+          var offsetFraction = fraction - interpolation.startOffset;
+          var localDuration = interpolation.endOffset - interpolation.startOffset;
+          var scaledLocalTime = localDuration == 0 ? 0 : interpolation.easingFunction(offsetFraction / localDuration);
+          scope.apply(target, interpolation.property, interpolation.interpolation(scaledLocalTime));
+        });
+      } else {
+        for (var property in propertySpecificKeyframeGroups)
+          if (property != 'offset' && property != 'easing' && property != 'composite')
+            scope.clear(target, property);
+      }
+    };
+  };
+
+
+  function makePropertySpecificKeyframeGroups(keyframes) {
+    var propertySpecificKeyframeGroups = {};
+
+    for (var i = 0; i < keyframes.length; i++) {
+      for (var member in keyframes[i]) {
+        if (member != 'offset' && member != 'easing' && member != 'composite') {
+          var propertySpecificKeyframe = {
+            offset: keyframes[i].offset,
+            easing: keyframes[i].easing,
+            value: keyframes[i][member]
+          };
+          propertySpecificKeyframeGroups[member] = propertySpecificKeyframeGroups[member] || [];
+          propertySpecificKeyframeGroups[member].push(propertySpecificKeyframe);
+        }
+      }
+    }
+
+    for (var groupName in propertySpecificKeyframeGroups) {
+      var group = propertySpecificKeyframeGroups[groupName];
+      if (group[0].offset != 0 || group[group.length - 1].offset != 1) {
+        throw {
+          type: DOMException.NOT_SUPPORTED_ERR,
+          name: 'NotSupportedError',
+          message: 'Partial keyframes are not supported'
+        };
+      }
+    }
+    return propertySpecificKeyframeGroups;
+  }
+
+
+  function makeInterpolations(propertySpecificKeyframeGroups) {
+    var interpolations = [];
+    for (var groupName in propertySpecificKeyframeGroups) {
+      var keyframes = propertySpecificKeyframeGroups[groupName];
+      for (var i = 0; i < keyframes.length - 1; i++) {
+        var startIndex = i;
+        var endIndex = i + 1;
+        var startOffset = keyframes[startIndex].offset;
+        var endOffset = keyframes[endIndex].offset;
+        var applyFrom = startOffset;
+        var applyTo = endOffset;
+
+        if (i == 0) {
+          applyFrom = -Infinity;
+          WEB_ANIMATIONS_TESTING && console.assert(startOffset == 0);
+          if (endOffset == 0) {
+            endIndex = startIndex;
+          }
+        }
+        if (i == keyframes.length - 2) {
+          applyTo = Infinity;
+          WEB_ANIMATIONS_TESTING && console.assert(endOffset == 1);
+          if (startOffset == 1) {
+            startIndex = endIndex;
+          }
+        }
+
+        interpolations.push({
+          applyFrom: applyFrom,
+          applyTo: applyTo,
+          startOffset: keyframes[startIndex].offset,
+          endOffset: keyframes[endIndex].offset,
+          easingFunction: shared.parseEasingFunction(keyframes[startIndex].easing),
+          property: groupName,
+          interpolation: scope.propertyInterpolation(groupName,
+              keyframes[startIndex].value,
+              keyframes[endIndex].value)
+        });
+      }
+    }
+    interpolations.sort(function(leftInterpolation, rightInterpolation) {
+      return leftInterpolation.startOffset - rightInterpolation.startOffset;
+    });
+    return interpolations;
+  }
+
+
+  if (WEB_ANIMATIONS_TESTING) {
+    testing.makePropertySpecificKeyframeGroups = makePropertySpecificKeyframeGroups;
+    testing.makeInterpolations = makeInterpolations;
+  }
+
+})(webAnimationsShared, webAnimations1, webAnimationsTesting);