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Since getFrames() must gather all properties set at a given keyframe offset time for a given easing function, we need to provide a total ordering for ComputedTimingFunction objects. Until the spec defines how to do this, we sort first by NS_STYLE_TRANSITION_TIMING_FUNCTION_* value, then second by the four values in a cubic-bezier() function (in order) or the integer and optional keyword in a steps() function. Because we don't support automatic spacing of keyframes yet, ComputedKeyFrame.computedOffset is always the same as Keyframe.offset. Another assumption made is that the value of easing for a Keyframe object at 100% should be the same as the value from the previous Keyframe for the same property. An alternative would be to leave off easing from that Keyframe, which would need the default value for that IDL dictionary member removed (otherwise it would always be set to "linear").
26 lines
919 B
Plaintext
26 lines
919 B
Plaintext
/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* The origin of this IDL file is
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* https://w3c.github.io/web-animations/#the-compositeoperation-enumeration
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* https://w3c.github.io/web-animations/#the-keyframe-dictionary
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* https://w3c.github.io/web-animations/#the-computedkeyframe-dictionary
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*
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* Copyright © 2015 W3C® (MIT, ERCIM, Keio), All Rights Reserved. W3C
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* liability, trademark and document use rules apply.
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*/
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enum CompositeOperation { "replace", "add", "accumulate" };
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dictionary Keyframe {
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double? offset = null;
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DOMString easing = "linear";
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CompositeOperation? composite = null;
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};
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dictionary ComputedKeyframe : Keyframe {
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double computedOffset;
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};
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