1 files changed, 197 insertions, 0 deletions
diff --git a/dom/smil/SMILCSSProperty.cpp b/dom/smil/SMILCSSProperty.cpp
new file mode 100644
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+++ 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,
+                                 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