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diff --git a/dom/smil/SMILCSSProperty.cpp b/dom/smil/SMILCSSProperty.cpp
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* representation of a SMIL-animatable CSS property on an element */
+
+#include "SMILCSSProperty.h"
+
+#include <utility>
+
+#include "mozilla/SMILCSSValueType.h"
+#include "mozilla/SMILValue.h"
+#include "mozilla/ServoBindings.h"
+#include "mozilla/StyleAnimationValue.h"
+#include "mozilla/dom/Element.h"
+#include "nsCSSProps.h"
+#include "nsDOMCSSAttrDeclaration.h"
+
+namespace mozilla {
+
+// Class Methods
+SMILCSSProperty::SMILCSSProperty(nsCSSPropertyID aPropID,
+ dom::Element* aElement,
+ const ComputedStyle* aBaseComputedStyle)
+ : mPropID(aPropID),
+ mElement(aElement),
+ mBaseComputedStyle(aBaseComputedStyle) {
+ MOZ_ASSERT(IsPropertyAnimatable(mPropID),
+ "Creating a SMILCSSProperty for a property "
+ "that's not supported for animation");
+}
+
+SMILValue SMILCSSProperty::GetBaseValue() const {
+ // To benefit from Return Value Optimization and avoid copy constructor calls
+ // due to our use of return-by-value, we must return the exact same object
+ // from ALL return points. This function must only return THIS variable:
+ SMILValue baseValue;
+
+ // SPECIAL CASE: (a) Shorthands
+ // (b) 'display'
+ // (c) No base ComputedStyle
+ if (nsCSSProps::IsShorthand(mPropID) || mPropID == eCSSProperty_display ||
+ !mBaseComputedStyle) {
+ // We can't look up the base (computed-style) value of shorthand
+ // properties because they aren't guaranteed to have a consistent computed
+ // value.
+ //
+ // Also, although we can look up the base value of the display property,
+ // doing so involves clearing and resetting the property which can cause
+ // frames to be recreated which we'd like to avoid.
+ //
+ // Furthermore, if we don't (yet) have a base ComputedStyle we obviously
+ // can't resolve a base value.
+ //
+ // In any case, just return a dummy value (initialized with the right
+ // type, so as not to indicate failure).
+ SMILValue tmpVal(&SMILCSSValueType::sSingleton);
+ std::swap(baseValue, tmpVal);
+ return baseValue;
+ }
+
+ AnimationValue computedValue;
+ computedValue.mServo =
+ Servo_ComputedValues_ExtractAnimationValue(mBaseComputedStyle, mPropID)
+ .Consume();
+ if (!computedValue.mServo) {
+ return baseValue;
+ }
+
+ baseValue = SMILCSSValueType::ValueFromAnimationValue(mPropID, mElement,
+ computedValue);
+ return baseValue;
+}
+
+nsresult SMILCSSProperty::ValueFromString(
+ const nsAString& aStr, const dom::SVGAnimationElement* aSrcElement,
+ SMILValue& aValue, bool& aPreventCachingOfSandwich) const {
+ NS_ENSURE_TRUE(IsPropertyAnimatable(mPropID), NS_ERROR_FAILURE);
+
+ SMILCSSValueType::ValueFromString(mPropID, mElement, aStr, aValue,
+ &aPreventCachingOfSandwich);
+
+ if (aValue.IsNull()) {
+ return NS_ERROR_FAILURE;
+ }
+
+ // XXX Due to bug 536660 (or at least that seems to be the most likely
+ // culprit), when we have animation setting display:none on a <use> element,
+ // if we DON'T set the property every sample, chaos ensues.
+ if (!aPreventCachingOfSandwich && mPropID == eCSSProperty_display) {
+ aPreventCachingOfSandwich = true;
+ }
+ return NS_OK;
+}
+
+nsresult SMILCSSProperty::SetAnimValue(const SMILValue& aValue) {
+ NS_ENSURE_TRUE(IsPropertyAnimatable(mPropID), NS_ERROR_FAILURE);
+ return mElement->SMILOverrideStyle()->SetSMILValue(mPropID, aValue);
+}
+
+void SMILCSSProperty::ClearAnimValue() {
+ // Put empty string in override style for our property
+ mElement->SMILOverrideStyle()->SetPropertyValue(mPropID, ""_ns, nullptr,
+ IgnoreErrors());
+}
+
+// Based on http://www.w3.org/TR/SVG/propidx.html
+// static
+bool SMILCSSProperty::IsPropertyAnimatable(nsCSSPropertyID aPropID) {
+ // NOTE: Right now, Gecko doesn't recognize the following properties from
+ // the SVG Property Index:
+ // alignment-baseline
+ // baseline-shift
+ // color-profile
+ // glyph-orientation-horizontal
+ // glyph-orientation-vertical
+ // kerning
+ // writing-mode
+
+ switch (aPropID) {
+ case eCSSProperty_clip:
+ case eCSSProperty_clip_rule:
+ case eCSSProperty_clip_path:
+ case eCSSProperty_color:
+ case eCSSProperty_color_interpolation:
+ case eCSSProperty_color_interpolation_filters:
+ case eCSSProperty_cursor:
+ case eCSSProperty_display:
+ case eCSSProperty_dominant_baseline:
+ case eCSSProperty_fill:
+ case eCSSProperty_fill_opacity:
+ case eCSSProperty_fill_rule:
+ case eCSSProperty_filter:
+ case eCSSProperty_flood_color:
+ case eCSSProperty_flood_opacity:
+ case eCSSProperty_font:
+ case eCSSProperty_font_family:
+ case eCSSProperty_font_size:
+ case eCSSProperty_font_size_adjust:
+ case eCSSProperty_font_stretch:
+ case eCSSProperty_font_style:
+ case eCSSProperty_font_variant:
+ case eCSSProperty_font_weight:
+ case eCSSProperty_height:
+ case eCSSProperty_image_rendering:
+ case eCSSProperty_letter_spacing:
+ case eCSSProperty_lighting_color:
+ case eCSSProperty_marker:
+ case eCSSProperty_marker_end:
+ case eCSSProperty_marker_mid:
+ case eCSSProperty_marker_start:
+ case eCSSProperty_mask:
+ case eCSSProperty_mask_type:
+ case eCSSProperty_opacity:
+ case eCSSProperty_overflow:
+ case eCSSProperty_pointer_events:
+ case eCSSProperty_shape_rendering:
+ case eCSSProperty_stop_color:
+ case eCSSProperty_stop_opacity:
+ case eCSSProperty_stroke:
+ case eCSSProperty_stroke_dasharray:
+ case eCSSProperty_stroke_dashoffset:
+ case eCSSProperty_stroke_linecap:
+ case eCSSProperty_stroke_linejoin:
+ case eCSSProperty_stroke_miterlimit:
+ case eCSSProperty_stroke_opacity:
+ case eCSSProperty_stroke_width:
+ case eCSSProperty_text_anchor:
+ case eCSSProperty_text_decoration:
+ case eCSSProperty_text_decoration_line:
+ case eCSSProperty_text_rendering:
+ case eCSSProperty_vector_effect:
+ case eCSSProperty_width:
+ case eCSSProperty_visibility:
+ case eCSSProperty_word_spacing:
+ return true;
+
+ // EXPLICITLY NON-ANIMATABLE PROPERTIES:
+ // (Some of these aren't supported at all in Gecko -- I've commented those
+ // ones out. If/when we add support for them, uncomment their line here)
+ // ----------------------------------------------------------------------
+ // case eCSSProperty_enable_background:
+ // case eCSSProperty_glyph_orientation_horizontal:
+ // case eCSSProperty_glyph_orientation_vertical:
+ // case eCSSProperty_writing_mode:
+ case eCSSProperty_direction:
+ case eCSSProperty_unicode_bidi:
+ return false;
+
+ default:
+ return false;
+ }
+}
+
+} // namespace mozilla