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import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo
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Roy Tam
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275
dom/smil/nsSMILCSSProperty.cpp
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275
dom/smil/nsSMILCSSProperty.cpp
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* representation of a SMIL-animatable CSS property on an element */
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#include "nsSMILCSSProperty.h"
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#include "mozilla/dom/Element.h"
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#include "mozilla/Move.h"
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#include "nsSMILCSSValueType.h"
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#include "nsSMILValue.h"
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#include "nsComputedDOMStyle.h"
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#include "nsCSSProps.h"
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#include "nsIDOMElement.h"
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#include "nsIDocument.h"
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using namespace mozilla::dom;
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// Helper function
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static bool
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GetCSSComputedValue(Element* aElem,
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nsCSSPropertyID aPropID,
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nsAString& aResult)
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{
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MOZ_ASSERT(!nsCSSProps::IsShorthand(aPropID),
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"Can't look up computed value of shorthand property");
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MOZ_ASSERT(nsSMILCSSProperty::IsPropertyAnimatable(aPropID),
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"Shouldn't get here for non-animatable properties");
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nsIDocument* doc = aElem->GetUncomposedDoc();
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if (!doc) {
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// This can happen if we process certain types of restyles mid-sample
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// and remove anonymous animated content from the document as a result.
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// See bug 534975.
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return false;
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}
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nsIPresShell* shell = doc->GetShell();
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if (!shell) {
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NS_WARNING("Unable to look up computed style -- no pres shell");
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return false;
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}
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RefPtr<nsComputedDOMStyle> computedStyle =
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NS_NewComputedDOMStyle(aElem, EmptyString(), shell);
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computedStyle->GetPropertyValue(aPropID, aResult);
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return true;
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}
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// Class Methods
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nsSMILCSSProperty::nsSMILCSSProperty(nsCSSPropertyID aPropID,
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Element* aElement)
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: mPropID(aPropID), mElement(aElement)
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{
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MOZ_ASSERT(IsPropertyAnimatable(mPropID),
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"Creating a nsSMILCSSProperty for a property "
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"that's not supported for animation");
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}
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nsSMILValue
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nsSMILCSSProperty::GetBaseValue() const
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{
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// To benefit from Return Value Optimization and avoid copy constructor calls
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// due to our use of return-by-value, we must return the exact same object
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// from ALL return points. This function must only return THIS variable:
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nsSMILValue baseValue;
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// SPECIAL CASE: (a) Shorthands
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// (b) 'display'
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if (nsCSSProps::IsShorthand(mPropID) || mPropID == eCSSProperty_display) {
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// We can't look up the base (computed-style) value of shorthand
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// properties because they aren't guaranteed to have a consistent computed
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// value.
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//
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// Also, although we can look up the base value of the display property,
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// doing so involves clearing and resetting the property which can cause
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// frames to be recreated which we'd like to avoid.
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//
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// In either case, just return a dummy value (initialized with the right
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// type, so as not to indicate failure).
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nsSMILValue tmpVal(&nsSMILCSSValueType::sSingleton);
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Swap(baseValue, tmpVal);
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return baseValue;
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}
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// GENERAL CASE: Non-Shorthands
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// (1) Put empty string in override style for property mPropID
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// (saving old override style value, so we can set it again when we're done)
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nsICSSDeclaration* overrideDecl = mElement->GetSMILOverrideStyle();
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nsAutoString cachedOverrideStyleVal;
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if (overrideDecl) {
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overrideDecl->GetPropertyValue(mPropID, cachedOverrideStyleVal);
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// (Don't bother clearing override style if it's already empty)
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if (!cachedOverrideStyleVal.IsEmpty()) {
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overrideDecl->SetPropertyValue(mPropID, EmptyString());
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}
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}
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// (2) Get Computed Style
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nsAutoString computedStyleVal;
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bool didGetComputedVal = GetCSSComputedValue(mElement, mPropID,
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computedStyleVal);
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// (3) Put cached override style back (if it's non-empty)
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if (overrideDecl && !cachedOverrideStyleVal.IsEmpty()) {
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overrideDecl->SetPropertyValue(mPropID, cachedOverrideStyleVal);
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}
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// (4) Populate our nsSMILValue from the computed style
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if (didGetComputedVal) {
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// When we parse animation values we check if they are context-sensitive or
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// not so that we don't cache animation values whose meaning may change.
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// For base values however this is unnecessary since on each sample the
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// compositor will fetch the (computed) base value and compare it against
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// the cached (computed) value and detect changes for us.
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nsSMILCSSValueType::ValueFromString(mPropID, mElement,
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computedStyleVal, baseValue,
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nullptr);
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}
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return baseValue;
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}
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nsresult
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nsSMILCSSProperty::ValueFromString(const nsAString& aStr,
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const SVGAnimationElement* aSrcElement,
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nsSMILValue& aValue,
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bool& aPreventCachingOfSandwich) const
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{
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NS_ENSURE_TRUE(IsPropertyAnimatable(mPropID), NS_ERROR_FAILURE);
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nsSMILCSSValueType::ValueFromString(mPropID, mElement, aStr, aValue,
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&aPreventCachingOfSandwich);
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if (aValue.IsNull()) {
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return NS_ERROR_FAILURE;
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}
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// XXX Due to bug 536660 (or at least that seems to be the most likely
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// culprit), when we have animation setting display:none on a <use> element,
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// if we DON'T set the property every sample, chaos ensues.
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if (!aPreventCachingOfSandwich && mPropID == eCSSProperty_display) {
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aPreventCachingOfSandwich = true;
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}
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return NS_OK;
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}
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nsresult
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nsSMILCSSProperty::SetAnimValue(const nsSMILValue& aValue)
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{
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NS_ENSURE_TRUE(IsPropertyAnimatable(mPropID), NS_ERROR_FAILURE);
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// Convert nsSMILValue to string
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nsAutoString valStr;
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if (!nsSMILCSSValueType::ValueToString(aValue, valStr)) {
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NS_WARNING("Failed to convert nsSMILValue for CSS property into a string");
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return NS_ERROR_FAILURE;
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}
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// Use string value to style the target element
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nsICSSDeclaration* overrideDecl = mElement->GetSMILOverrideStyle();
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if (overrideDecl) {
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nsAutoString oldValStr;
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overrideDecl->GetPropertyValue(mPropID, oldValStr);
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if (valStr.Equals(oldValStr)) {
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return NS_OK;
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}
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overrideDecl->SetPropertyValue(mPropID, valStr);
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}
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return NS_OK;
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}
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void
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nsSMILCSSProperty::ClearAnimValue()
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{
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// Put empty string in override style for our property
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nsICSSDeclaration* overrideDecl = mElement->GetSMILOverrideStyle();
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if (overrideDecl) {
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overrideDecl->SetPropertyValue(mPropID, EmptyString());
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}
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}
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// Based on http://www.w3.org/TR/SVG/propidx.html
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// static
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bool
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nsSMILCSSProperty::IsPropertyAnimatable(nsCSSPropertyID aPropID)
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{
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// NOTE: Right now, Gecko doesn't recognize the following properties from
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// the SVG Property Index:
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// alignment-baseline
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// baseline-shift
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// color-profile
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// color-rendering
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// glyph-orientation-horizontal
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// glyph-orientation-vertical
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// kerning
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// writing-mode
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switch (aPropID) {
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case eCSSProperty_clip:
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case eCSSProperty_clip_rule:
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case eCSSProperty_clip_path:
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case eCSSProperty_color:
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case eCSSProperty_color_interpolation:
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case eCSSProperty_color_interpolation_filters:
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case eCSSProperty_cursor:
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case eCSSProperty_display:
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case eCSSProperty_dominant_baseline:
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case eCSSProperty_fill:
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case eCSSProperty_fill_opacity:
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case eCSSProperty_fill_rule:
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case eCSSProperty_filter:
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case eCSSProperty_flood_color:
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case eCSSProperty_flood_opacity:
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case eCSSProperty_font:
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case eCSSProperty_font_family:
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case eCSSProperty_font_size:
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case eCSSProperty_font_size_adjust:
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case eCSSProperty_font_stretch:
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case eCSSProperty_font_style:
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case eCSSProperty_font_variant:
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case eCSSProperty_font_weight:
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case eCSSProperty_height:
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case eCSSProperty_image_rendering:
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case eCSSProperty_letter_spacing:
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case eCSSProperty_lighting_color:
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case eCSSProperty_marker:
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case eCSSProperty_marker_end:
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case eCSSProperty_marker_mid:
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case eCSSProperty_marker_start:
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case eCSSProperty_mask:
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case eCSSProperty_mask_type:
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case eCSSProperty_opacity:
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case eCSSProperty_overflow:
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case eCSSProperty_pointer_events:
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case eCSSProperty_shape_rendering:
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case eCSSProperty_stop_color:
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case eCSSProperty_stop_opacity:
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case eCSSProperty_stroke:
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case eCSSProperty_stroke_dasharray:
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case eCSSProperty_stroke_dashoffset:
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case eCSSProperty_stroke_linecap:
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case eCSSProperty_stroke_linejoin:
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case eCSSProperty_stroke_miterlimit:
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case eCSSProperty_stroke_opacity:
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case eCSSProperty_stroke_width:
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case eCSSProperty_text_anchor:
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case eCSSProperty_text_decoration:
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case eCSSProperty_text_decoration_line:
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case eCSSProperty_text_rendering:
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case eCSSProperty_vector_effect:
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case eCSSProperty_width:
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case eCSSProperty_visibility:
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case eCSSProperty_word_spacing:
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return true;
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// EXPLICITLY NON-ANIMATABLE PROPERTIES:
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// (Some of these aren't supported at all in Gecko -- I've commented those
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// ones out. If/when we add support for them, uncomment their line here)
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// ----------------------------------------------------------------------
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// case eCSSProperty_enable_background:
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// case eCSSProperty_glyph_orientation_horizontal:
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// case eCSSProperty_glyph_orientation_vertical:
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// case eCSSProperty_writing_mode:
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case eCSSProperty_direction:
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case eCSSProperty_unicode_bidi:
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return false;
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default:
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return false;
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}
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}
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