[WIP] CSS Motion Path: offset shorthand ready for position and anchor

third_party/WebKit/Source/core/css/ComputedStyleCSSValueMapping.cpp

 /*
  * Copyright (C) 2004 Zack Rusin <zack@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2011 Sencha, Inc. All rights reserved.
  * Copyright (C) 2015 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ skipping 430 matching lines @@
     if (data.positionType() == LegacyPosition)
         result->append(*CSSPrimitiveValue::createIdentifier(CSSValueLegacy));
     // To avoid needing to copy the RareNonInheritedData, we repurpose the 'auto' flag to not just mean 'auto' prior to running the StyleAdjuster but also mean 'normal' after running it.
     result->append(*CSSPrimitiveValue::create(data.position() == ItemPositionAuto ? ComputedStyle::initialDefaultAlignment().position() : data.position()));
     if (data.position() >= ItemPositionCenter && data.overflow() != OverflowAlignmentDefault)
         result->append(*CSSPrimitiveValue::create(data.overflow()));
     ASSERT(result->length() <= 2);
     return result;
 }
 
+static CSSValue* valueForOffsetPath(const StylePath* styleMotionPath)
+{
+    if (styleMotionPath)
+        return styleMotionPath->computedCSSValue();
+    return CSSPrimitiveValue::createIdentifier(CSSValueNone);
+}
+
+static CSSValue* valueForOffsetRotation(const StyleOffsetRotation& offsetRotation)
+{
+    CSSValueList* list = CSSValueList::createSpaceSeparated();
+    if (offsetRotation.type == OffsetRotationAuto)
+        list->append(*CSSPrimitiveValue::createIdentifier(CSSValueAuto));
+    list->append(*CSSPrimitiveValue::create(offsetRotation.angle, CSSPrimitiveValue::UnitType::Degrees));
+    return list;
+}
+
 static CSSValueList* valuesForGridShorthand(const StylePropertyShorthand& shorthand, const ComputedStyle& style, const LayoutObject* layoutObject, Node* styledNode, bool allowVisitedStyle)
 {
     CSSValueList* list = CSSValueList::createSlashSeparated();
     for (size_t i = 0; i < shorthand.length(); ++i) {
         const CSSValue* value = ComputedStyleCSSValueMapping::get(shorthand.properties()[i], style, layoutObject, styledNode, allowVisitedStyle);
         ASSERT(value);
         list->append(*value);
     }
     return list;
 }
@@ skipping 1106 matching lines @@
     list->append(*capsValue);
 
     list->append(*valueForFontWeight(style));
     list->append(*valueForFontStretch(style));
     list->append(*sizeAndLineHeight);
     list->append(*valueForFontFamily(style));
 
     return list;
 }
 
+CSSValue* ComputedStyleCSSValueMapping::valueForOffset(const ComputedStyle& style)
+{
+    CSSValueList* list = CSSValueList::createSpaceSeparated();
+    if (style.offsetPosition() != ComputedStyle::initialOffsetPosition()) {
+        DCHECK(RuntimeEnabledFeatures::cssOffsetPositionAnchorEnabled());
+        list->append(*valueForPosition(style.offsetPosition(), style));
+    }
+
+    list->append(*valueForOffsetPath(style.offsetPath()));
+    list->append(*zoomAdjustedPixelValueForLength(style.offsetDistance(), style));
+    list->append(*valueForOffsetRotation(style.offsetRotation()));
+
+    if (style.offsetAnchor() == ComputedStyle::initialOffsetAnchor())
+        return list;
+
+    DCHECK(RuntimeEnabledFeatures::cssOffsetPositionAnchorEnabled());
+    CSSValueList* outerList = CSSValueList::createSlashSeparated();
+    outerList->append(*list);
+    outerList->append(*valueForPosition(style.offsetAnchor(), style));
+    return outerList;
+}
+
 static CSSValue* valueForScrollSnapDestination(const LengthPoint& destination, const ComputedStyle& style)
 {
     CSSValueList* list = CSSValueList::createSpaceSeparated();
     list->append(*zoomAdjustedPixelValueForLength(destination.x(), style));
     list->append(*zoomAdjustedPixelValueForLength(destination.y(), style));
     return list;
 }
 
 static CSSValue* valueForScrollSnapPoints(const ScrollSnapPoints& points, const ComputedStyle& style)
 {
@@ skipping 1149 matching lines @@
         return valuesForSidesShorthand(paddingShorthand(), style, layoutObject, styledNode, allowVisitedStyle);
     // Individual properties not part of the spec.
     case CSSPropertyBackgroundRepeatX:
     case CSSPropertyBackgroundRepeatY:
         return nullptr;
 
     case CSSPropertyMotion:
         return valuesForShorthandProperty(motionShorthand(), style, layoutObject, styledNode, allowVisitedStyle);
 
     case CSSPropertyOffset:
-        return valuesForShorthandProperty(offsetShorthand(), style, layoutObject, styledNode, allowVisitedStyle);
+        return valueForOffset(style);
 
     case CSSPropertyOffsetAnchor:
         return valueForPosition(style.offsetAnchor(), style);
 
     case CSSPropertyOffsetPosition:
         return valueForPosition(style.offsetPosition(), style);
 
     case CSSPropertyOffsetPath:
-        if (const StylePath* styleMotionPath = style.offsetPath())
-            return styleMotionPath->computedCSSValue();
-        return CSSPrimitiveValue::createIdentifier(CSSValueNone);
+        return valueForOffsetPath(style.offsetPath());
 
     case CSSPropertyOffsetDistance:
         return zoomAdjustedPixelValueForLength(style.offsetDistance(), style);
 
-    case CSSPropertyOffsetRotation: {
-        CSSValueList* list = CSSValueList::createSpaceSeparated();
-        if (style.offsetRotation().type == OffsetRotationAuto)
-            list->append(*CSSPrimitiveValue::createIdentifier(CSSValueAuto));
-        list->append(*CSSPrimitiveValue::create(style.offsetRotation().angle, CSSPrimitiveValue::UnitType::Degrees));
-        return list;
-    }
+    case CSSPropertyOffsetRotation:
+        return valueForOffsetRotation(style.offsetRotation());
 
     // Unimplemented CSS 3 properties (including CSS3 shorthand properties).
     case CSSPropertyWebkitTextEmphasis:
         return nullptr;
 
     // Directional properties are resolved by resolveDirectionAwareProperty() before the switch.
     case CSSPropertyWebkitBorderEnd:
     case CSSPropertyWebkitBorderEndColor:
     case CSSPropertyWebkitBorderEndStyle:
     case CSSPropertyWebkitBorderEndWidth:
@@ skipping 258 matching lines @@
     case CSSPropertyAll:
         return nullptr;
     default:
         break;
     }
     ASSERT_NOT_REACHED();
     return nullptr;
 }
 
 } // namespace blink