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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /dom/smil/nsSMILCSSProperty.cpp
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'dom/smil/nsSMILCSSProperty.cpp')
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diff --git a/dom/smil/nsSMILCSSProperty.cpp b/dom/smil/nsSMILCSSProperty.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 "nsSMILCSSProperty.h"
+
+#include "mozilla/dom/Element.h"
+#include "mozilla/Move.h"
+#include "nsSMILCSSValueType.h"
+#include "nsSMILValue.h"
+#include "nsComputedDOMStyle.h"
+#include "nsCSSProps.h"
+#include "nsIDOMElement.h"
+#include "nsIDocument.h"
+
+using namespace mozilla::dom;
+
+// Helper function
+static bool
+GetCSSComputedValue(Element* aElem,
+ nsCSSPropertyID aPropID,
+ nsAString& aResult)
+{
+ MOZ_ASSERT(!nsCSSProps::IsShorthand(aPropID),
+ "Can't look up computed value of shorthand property");
+ MOZ_ASSERT(nsSMILCSSProperty::IsPropertyAnimatable(aPropID),
+ "Shouldn't get here for non-animatable properties");
+
+ nsIDocument* doc = aElem->GetUncomposedDoc();
+ if (!doc) {
+ // This can happen if we process certain types of restyles mid-sample
+ // and remove anonymous animated content from the document as a result.
+ // See bug 534975.
+ return false;
+ }
+
+ nsIPresShell* shell = doc->GetShell();
+ if (!shell) {
+ NS_WARNING("Unable to look up computed style -- no pres shell");
+ return false;
+ }
+
+ RefPtr<nsComputedDOMStyle> computedStyle =
+ NS_NewComputedDOMStyle(aElem, EmptyString(), shell);
+
+ computedStyle->GetPropertyValue(aPropID, aResult);
+ return true;
+}
+
+// Class Methods
+nsSMILCSSProperty::nsSMILCSSProperty(nsCSSPropertyID aPropID,
+ Element* aElement)
+ : mPropID(aPropID), mElement(aElement)
+{
+ MOZ_ASSERT(IsPropertyAnimatable(mPropID),
+ "Creating a nsSMILCSSProperty for a property "
+ "that's not supported for animation");
+}
+
+nsSMILValue
+nsSMILCSSProperty::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:
+ nsSMILValue baseValue;
+
+ // SPECIAL CASE: (a) Shorthands
+ // (b) 'display'
+ if (nsCSSProps::IsShorthand(mPropID) || mPropID == eCSSProperty_display) {
+ // 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.
+ //
+ // In either case, just return a dummy value (initialized with the right
+ // type, so as not to indicate failure).
+ nsSMILValue tmpVal(&nsSMILCSSValueType::sSingleton);
+ Swap(baseValue, tmpVal);
+ return baseValue;
+ }
+
+ // GENERAL CASE: Non-Shorthands
+ // (1) Put empty string in override style for property mPropID
+ // (saving old override style value, so we can set it again when we're done)
+ nsICSSDeclaration* overrideDecl = mElement->GetSMILOverrideStyle();
+ nsAutoString cachedOverrideStyleVal;
+ if (overrideDecl) {
+ overrideDecl->GetPropertyValue(mPropID, cachedOverrideStyleVal);
+ // (Don't bother clearing override style if it's already empty)
+ if (!cachedOverrideStyleVal.IsEmpty()) {
+ overrideDecl->SetPropertyValue(mPropID, EmptyString());
+ }
+ }
+
+ // (2) Get Computed Style
+ nsAutoString computedStyleVal;
+ bool didGetComputedVal = GetCSSComputedValue(mElement, mPropID,
+ computedStyleVal);
+
+ // (3) Put cached override style back (if it's non-empty)
+ if (overrideDecl && !cachedOverrideStyleVal.IsEmpty()) {
+ overrideDecl->SetPropertyValue(mPropID, cachedOverrideStyleVal);
+ }
+
+ // (4) Populate our nsSMILValue from the computed style
+ if (didGetComputedVal) {
+ // When we parse animation values we check if they are context-sensitive or
+ // not so that we don't cache animation values whose meaning may change.
+ // For base values however this is unnecessary since on each sample the
+ // compositor will fetch the (computed) base value and compare it against
+ // the cached (computed) value and detect changes for us.
+ nsSMILCSSValueType::ValueFromString(mPropID, mElement,
+ computedStyleVal, baseValue,
+ nullptr);
+ }
+ return baseValue;
+}
+
+nsresult
+nsSMILCSSProperty::ValueFromString(const nsAString& aStr,
+ const SVGAnimationElement* aSrcElement,
+ nsSMILValue& aValue,
+ bool& aPreventCachingOfSandwich) const
+{
+ NS_ENSURE_TRUE(IsPropertyAnimatable(mPropID), NS_ERROR_FAILURE);
+
+ nsSMILCSSValueType::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
+nsSMILCSSProperty::SetAnimValue(const nsSMILValue& aValue)
+{
+ NS_ENSURE_TRUE(IsPropertyAnimatable(mPropID), NS_ERROR_FAILURE);
+
+ // Convert nsSMILValue to string
+ nsAutoString valStr;
+ if (!nsSMILCSSValueType::ValueToString(aValue, valStr)) {
+ NS_WARNING("Failed to convert nsSMILValue for CSS property into a string");
+ return NS_ERROR_FAILURE;
+ }
+
+ // Use string value to style the target element
+ nsICSSDeclaration* overrideDecl = mElement->GetSMILOverrideStyle();
+ if (overrideDecl) {
+ nsAutoString oldValStr;
+ overrideDecl->GetPropertyValue(mPropID, oldValStr);
+ if (valStr.Equals(oldValStr)) {
+ return NS_OK;
+ }
+ overrideDecl->SetPropertyValue(mPropID, valStr);
+ }
+ return NS_OK;
+}
+
+void
+nsSMILCSSProperty::ClearAnimValue()
+{
+ // Put empty string in override style for our property
+ nsICSSDeclaration* overrideDecl = mElement->GetSMILOverrideStyle();
+ if (overrideDecl) {
+ overrideDecl->SetPropertyValue(mPropID, EmptyString());
+ }
+}
+
+// Based on http://www.w3.org/TR/SVG/propidx.html
+// static
+bool
+nsSMILCSSProperty::IsPropertyAnimatable(nsCSSPropertyID aPropID)
+{
+ // NOTE: Right now, Gecko doesn't recognize the following properties from
+ // the SVG Property Index:
+ // alignment-baseline
+ // baseline-shift
+ // color-profile
+ // color-rendering
+ // 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;
+ }
+}