issue #908 - implement missing parts of CSS mask

16 files changed, 151 insertions, 190 deletions

diff --git a/layout/style/Declaration.cpp b/layout/style/Declaration.cpp
index c67f6b2a2..b2de159ed 100644
--- a/layout/style/Declaration.cpp
+++ b/layout/style/Declaration.cpp
@@ -395,28 +395,25 @@ Declaration::GetImageLayerValue(
                origin->mValue.GetUnit() == eCSSUnit_Enumerated,
                "should not have inherit/initial within list");
 
-    int32_t originDefaultValue =
+    StyleGeometryBox originDefaultValue =
       (aTable == nsStyleImageLayers::kBackgroundLayerTable)
-      ? NS_STYLE_IMAGELAYER_ORIGIN_PADDING : NS_STYLE_IMAGELAYER_ORIGIN_BORDER;
-    if (clip->mValue.GetIntValue() != NS_STYLE_IMAGELAYER_CLIP_BORDER ||
-        origin->mValue.GetIntValue() != originDefaultValue) {
+      ? StyleGeometryBox::Padding : StyleGeometryBox::Border;
+    if (static_cast<StyleGeometryBox>(clip->mValue.GetIntValue()) !=
+        StyleGeometryBox::Border ||
+        static_cast<StyleGeometryBox>(origin->mValue.GetIntValue()) !=
+        originDefaultValue) {
 #ifdef DEBUG
-      for (size_t i = 0; nsCSSProps::kImageLayerOriginKTable[i].mValue != -1; i++) {
+      const nsCSSProps::KTableEntry* originTable =
+        nsCSSProps::kKeywordTableTable[aTable[nsStyleImageLayers::origin]];
+      const nsCSSProps::KTableEntry* clipTable =
+        nsCSSProps::kKeywordTableTable[aTable[nsStyleImageLayers::clip]];
+      for (size_t i = 0; originTable[i].mValue != -1; i++) {
         // For each keyword & value in kOriginKTable, ensure that
         // kBackgroundKTable has a matching entry at the same position.
-        MOZ_ASSERT(nsCSSProps::kImageLayerOriginKTable[i].mKeyword ==
-                   nsCSSProps::kBackgroundClipKTable[i].mKeyword);
-        MOZ_ASSERT(nsCSSProps::kImageLayerOriginKTable[i].mValue ==
-                   nsCSSProps::kBackgroundClipKTable[i].mValue);
+        MOZ_ASSERT(originTable[i].mKeyword == clipTable[i].mKeyword);
+        MOZ_ASSERT(originTable[i].mValue == clipTable[i].mValue);
       }
 #endif
-      static_assert(NS_STYLE_IMAGELAYER_CLIP_BORDER ==
-                    NS_STYLE_IMAGELAYER_ORIGIN_BORDER &&
-                    NS_STYLE_IMAGELAYER_CLIP_PADDING ==
-                    NS_STYLE_IMAGELAYER_ORIGIN_PADDING &&
-                    NS_STYLE_IMAGELAYER_CLIP_CONTENT ==
-                    NS_STYLE_IMAGELAYER_ORIGIN_CONTENT,
-                    "mask-clip and mask-origin style constants must agree");
       aValue.Append(char16_t(' '));
       origin->mValue.AppendToString(aTable[nsStyleImageLayers::origin], aValue,
                                     aSerialization);
@@ -462,11 +459,7 @@ Declaration::GetImageLayerValue(
         }
       // This layer is an mask layer
       } else {
-#ifdef MOZ_ENABLE_MASK_AS_SHORTHAND
         MOZ_ASSERT(aTable == nsStyleImageLayers::kMaskLayerTable);
-#else
-        MOZ_ASSERT_UNREACHABLE("Should never get here when mask-as-shorthand is disable");
-#endif
         if (repeat || positionX || positionY || clip || origin || size ||
             composite || mode) {
           // Uneven length lists, so can't be serialized as shorthand.
@@ -487,11 +480,7 @@ Declaration::GetImageLayerValue(
       }
     // This layer is an mask layer
     } else {
-#ifdef MOZ_ENABLE_MASK_AS_SHORTHAND
       MOZ_ASSERT(aTable == nsStyleImageLayers::kMaskLayerTable);
-#else
-      MOZ_ASSERT_UNREACHABLE("Should never get here when mask-as-shorthand is disable");
-#endif
       if (!repeat || !positionX || !positionY || !clip || !origin || !size ||
           !composite || !mode) {
         // Uneven length lists, so can't be serialized as shorthand.
@@ -817,7 +806,6 @@ Declaration::GetPropertyValueInternal(
                                  nsStyleImageLayers::kBackgroundLayerTable);
       break;
     }
-#ifdef MOZ_ENABLE_MASK_AS_SHORTHAND
     case eCSSProperty_mask: {
       GetImageLayerValue(data, aValue, aSerialization,
                          nsStyleImageLayers::kMaskLayerTable);
@@ -828,7 +816,6 @@ Declaration::GetPropertyValueInternal(
                                  nsStyleImageLayers::kMaskLayerTable);
       break;
     }
-#endif
     case eCSSProperty_font: {
       // systemFont might not be present; other values are guaranteed to be
       // available based on the shorthand check at the beginning of the
diff --git a/layout/style/StyleAnimationValue.cpp b/layout/style/StyleAnimationValue.cpp
index eb34c3d83..a0f52b4ea 100644
--- a/layout/style/StyleAnimationValue.cpp
+++ b/layout/style/StyleAnimationValue.cpp
@@ -4255,7 +4255,6 @@ StyleAnimationValue::ExtractComputedValue(nsCSSPropertyID aProperty,
 
 
         }
-#ifdef MOZ_ENABLE_MASK_AS_SHORTHAND
         case eCSSProperty_mask_position_x: {
           const nsStyleImageLayers& layers =
             static_cast<const nsStyleSVGReset*>(styleStruct)->mMask;
@@ -4269,21 +4268,18 @@ StyleAnimationValue::ExtractComputedValue(nsCSSPropertyID aProperty,
 
           break;
         }
-#endif
         case eCSSProperty_background_size: {
           const nsStyleImageLayers& layers =
             static_cast<const nsStyleBackground*>(styleStruct)->mImage;
           ExtractImageLayerSizePairList(layers, aComputedValue);
           break;
         }
-#ifdef MOZ_ENABLE_MASK_AS_SHORTHAND
         case eCSSProperty_mask_size: {
           const nsStyleImageLayers& layers =
             static_cast<const nsStyleSVGReset*>(styleStruct)->mMask;
           ExtractImageLayerSizePairList(layers, aComputedValue);
           break;
         }
-#endif
 
         case eCSSProperty_clip_path: {
           const nsStyleSVGReset* svgReset =
diff --git a/layout/style/nsCSSDataBlock.cpp b/layout/style/nsCSSDataBlock.cpp
index fe2dc621a..1dfdaed0e 100644
--- a/layout/style/nsCSSDataBlock.cpp
+++ b/layout/style/nsCSSDataBlock.cpp
@@ -61,7 +61,6 @@ TryToStartImageLoadOnValue(const nsCSSValue& aValue, nsIDocument* aDocument,
   MOZ_ASSERT(aDocument);
 
   if (aValue.GetUnit() == eCSSUnit_URL) {
-#ifdef MOZ_ENABLE_MASK_AS_SHORTHAND
     // The 'mask-image' property accepts local reference URIs.
     // For example,
     //   mask-image: url(#mask_id); // refer to a SVG mask element, whose id is
@@ -94,7 +93,6 @@ TryToStartImageLoadOnValue(const nsCSSValue& aValue, nsIDocument* aDocument,
         }
       }
     }
-#endif
     aValue.StartImageLoad(aDocument);
     if (aForTokenStream && aContext) {
       CSSVariableImageTable::Add(aContext, aProperty,
diff --git a/layout/style/nsCSSKeywordList.h b/layout/style/nsCSSKeywordList.h
index 94968faca..34a46ffce 100644
--- a/layout/style/nsCSSKeywordList.h
+++ b/layout/style/nsCSSKeywordList.h
@@ -405,6 +405,7 @@ CSS_KEY(n-resize, n_resize)
 CSS_KEY(narrower, narrower)
 CSS_KEY(ne-resize, ne_resize)
 CSS_KEY(nesw-resize, nesw_resize)
+CSS_KEY(no-clip, no_clip)
 CSS_KEY(no-close-quote, no_close_quote)
 CSS_KEY(no-common-ligatures, no_common_ligatures)
 CSS_KEY(no-contextual, no_contextual)
diff --git a/layout/style/nsCSSParser.cpp b/layout/style/nsCSSParser.cpp
index 736c66f87..a8309314f 100644
--- a/layout/style/nsCSSParser.cpp
+++ b/layout/style/nsCSSParser.cpp
@@ -12005,7 +12005,6 @@ CSSParserImpl::ParsePropertyByFunction(nsCSSPropertyID aPropID)
     return ParsePaintOrder();
   case eCSSProperty_scroll_snap_type:
     return ParseScrollSnapType();
-#ifdef MOZ_ENABLE_MASK_AS_SHORTHAND
   case eCSSProperty_mask:
     return ParseImageLayers(nsStyleImageLayers::kMaskLayerTable);
   case eCSSProperty_mask_repeat:
@@ -12018,7 +12017,6 @@ CSSParserImpl::ParsePropertyByFunction(nsCSSPropertyID aPropID)
                aPropID == eCSSProperty_mask_position_x);
   case eCSSProperty_mask_size:
     return ParseImageLayerSize(eCSSProperty_mask_size);
-#endif
   case eCSSProperty__webkit_text_stroke:
     return ParseWebkitTextStroke();
   case eCSSProperty_all:
@@ -12424,7 +12422,7 @@ CSSParserImpl::ParseImageLayersItem(
   aState.mImage->mValue.SetNoneValue();
   aState.mAttachment->mValue.SetIntValue(NS_STYLE_IMAGELAYER_ATTACHMENT_SCROLL,
                                          eCSSUnit_Enumerated);
-  aState.mClip->mValue.SetIntValue(NS_STYLE_IMAGELAYER_CLIP_BORDER,
+  aState.mClip->mValue.SetIntValue(StyleGeometryBox::Border,
                                    eCSSUnit_Enumerated);
 
   aState.mRepeat->mXValue.SetIntValue(NS_STYLE_IMAGELAYER_REPEAT_REPEAT,
@@ -12437,10 +12435,10 @@ CSSParserImpl::ParseImageLayersItem(
   aState.mPositionY->mValue.SetArrayValue(positionYArr, eCSSUnit_Array);
 
   if (eCSSProperty_mask == aTable[nsStyleImageLayers::shorthand]) {
-    aState.mOrigin->mValue.SetIntValue(NS_STYLE_IMAGELAYER_ORIGIN_BORDER,
+    aState.mOrigin->mValue.SetIntValue(StyleGeometryBox::Border,
                                        eCSSUnit_Enumerated);
   } else {
-    aState.mOrigin->mValue.SetIntValue(NS_STYLE_IMAGELAYER_ORIGIN_PADDING,
+    aState.mOrigin->mValue.SetIntValue(StyleGeometryBox::Padding,
                                        eCSSUnit_Enumerated);
   }
   positionXArr->Item(1).SetPercentValue(0.0f);
@@ -12462,6 +12460,8 @@ CSSParserImpl::ParseImageLayersItem(
        haveMode = false,
        haveSomething = false;
 
+  const KTableEntry* originTable =
+    nsCSSProps::kKeywordTableTable[aTable[nsStyleImageLayers::origin]];
   while (GetToken(true)) {
     nsCSSTokenType tt = mToken.mType;
     UngetToken(); // ...but we'll still cheat and use mToken
@@ -12531,8 +12531,7 @@ CSSParserImpl::ParseImageLayersItem(
           aState.mSize->mXValue = scratch.mXValue;
           aState.mSize->mYValue = scratch.mYValue;
         }
-      } else if (nsCSSProps::FindKeyword(keyword,
-                   nsCSSProps::kImageLayerOriginKTable, dummy)) {
+      } else if (nsCSSProps::FindKeyword(keyword, originTable, dummy)) {
         if (haveOrigin)
           return false;
         haveOrigin = true;
@@ -12547,23 +12546,15 @@ CSSParserImpl::ParseImageLayersItem(
         // immediately following the first one (for background-origin).
 
 #ifdef DEBUG
-        for (size_t i = 0; nsCSSProps::kImageLayerOriginKTable[i].mValue != -1; i++) {
+        const KTableEntry* clipTable =
+          nsCSSProps::kKeywordTableTable[aTable[nsStyleImageLayers::clip]];
+        for (size_t i = 0; originTable[i].mValue != -1; i++) {
           // For each keyword & value in kOriginKTable, ensure that
           // kBackgroundKTable has a matching entry at the same position.
-          MOZ_ASSERT(nsCSSProps::kImageLayerOriginKTable[i].mKeyword ==
-                     nsCSSProps::kBackgroundClipKTable[i].mKeyword);
-          MOZ_ASSERT(nsCSSProps::kImageLayerOriginKTable[i].mValue ==
-                     nsCSSProps::kBackgroundClipKTable[i].mValue);
+          MOZ_ASSERT(originTable[i].mKeyword == clipTable[i].mKeyword);
+          MOZ_ASSERT(originTable[i].mValue == clipTable[i].mValue);
         }
 #endif
-        static_assert(NS_STYLE_IMAGELAYER_CLIP_BORDER ==
-                      NS_STYLE_IMAGELAYER_ORIGIN_BORDER &&
-                      NS_STYLE_IMAGELAYER_CLIP_PADDING ==
-                      NS_STYLE_IMAGELAYER_ORIGIN_PADDING &&
-                      NS_STYLE_IMAGELAYER_CLIP_CONTENT ==
-                      NS_STYLE_IMAGELAYER_ORIGIN_CONTENT,
-                      "bg-clip and bg-origin style constants must agree");
-
         CSSParseResult result =
           ParseSingleValueProperty(aState.mClip->mValue,
                                    aTable[nsStyleImageLayers::clip]);
diff --git a/layout/style/nsCSSPropAliasList.h b/layout/style/nsCSSPropAliasList.h
index 2699549ff..f7938af9e 100644
--- a/layout/style/nsCSSPropAliasList.h
+++ b/layout/style/nsCSSPropAliasList.h
@@ -453,7 +453,6 @@ CSS_PROP_ALIAS(-webkit-user-select,
                WebkitUserSelect,
                WEBKIT_PREFIX_PREF)
 
-#ifdef MOZ_ENABLE_MASK_AS_SHORTHAND
 CSS_PROP_ALIAS(-webkit-mask,
                mask,
                WebkitMask,
@@ -494,5 +493,4 @@ CSS_PROP_ALIAS(-webkit-mask-size,
                mask_size,
                WebkitMaskSize,
                WEBKIT_PREFIX_PREF)
-#endif
 #undef WEBKIT_PREFIX_PREF
diff --git a/layout/style/nsCSSPropList.h b/layout/style/nsCSSPropList.h
index b04921dcb..2049f70e8 100644
--- a/layout/style/nsCSSPropList.h
+++ b/layout/style/nsCSSPropList.h
@@ -564,7 +564,7 @@ CSS_PROP_BACKGROUND(
         CSS_PROPERTY_VALUE_LIST_USES_COMMAS,
     "",
     VARIANT_KEYWORD, // used by list parsing
-    kImageLayerOriginKTable,
+    kBackgroundOriginKTable,
     CSS_PROP_NO_OFFSET,
     eStyleAnimType_Discrete)
 CSS_PROP_SHORTHAND(
@@ -2645,19 +2645,6 @@ CSS_PROP_SVG(
     nullptr,
     CSS_PROP_NO_OFFSET,
     eStyleAnimType_Discrete)
-#ifndef MOZ_ENABLE_MASK_AS_SHORTHAND
-CSS_PROP_SVGRESET(
-    mask,
-    mask,
-    Mask,
-    CSS_PROPERTY_PARSE_VALUE |
-      CSS_PROPERTY_CREATES_STACKING_CONTEXT,
-    "",
-    VARIANT_HUO,
-    nullptr,
-    CSS_PROP_NO_OFFSET,
-    eStyleAnimType_Discrete)
-#else
 CSS_PROP_SHORTHAND(
     mask,
     mask,
@@ -2672,7 +2659,7 @@ CSS_PROP_SVGRESET(
         CSS_PROPERTY_VALUE_LIST_USES_COMMAS,
     "",
     VARIANT_KEYWORD, // used by list parsing
-    kImageLayerOriginKTable,
+    kMaskClipKTable,
     CSS_PROP_NO_OFFSET,
     eStyleAnimType_Discrete)
 CSS_PROP_SVGRESET(
@@ -2718,7 +2705,7 @@ CSS_PROP_SVGRESET(
         CSS_PROPERTY_VALUE_LIST_USES_COMMAS,
     "",
     VARIANT_KEYWORD, // used by list parsing
-    kImageLayerOriginKTable,
+    kMaskOriginKTable,
     CSS_PROP_NO_OFFSET,
     eStyleAnimType_Discrete)
 CSS_PROP_SHORTHAND(
@@ -2776,7 +2763,6 @@ CSS_PROP_SVGRESET(
     kImageLayerSizeKTable,
     CSS_PROP_NO_OFFSET,
     eStyleAnimType_Custom)
-#endif // MOZ_ENABLE_MASK_AS_SHORTHAND
 CSS_PROP_SVGRESET(
     mask-type,
     mask_type,
diff --git a/layout/style/nsCSSProps.cpp b/layout/style/nsCSSProps.cpp
index 9805eae14..ac2978c27 100644
--- a/layout/style/nsCSSProps.cpp
+++ b/layout/style/nsCSSProps.cpp
@@ -932,33 +932,43 @@ const KTableEntry nsCSSProps::kImageLayerAttachmentKTable[] = {
   { eCSSKeyword_UNKNOWN, -1 }
 };
 
-static_assert(NS_STYLE_IMAGELAYER_CLIP_BORDER == NS_STYLE_IMAGELAYER_ORIGIN_BORDER &&
-              NS_STYLE_IMAGELAYER_CLIP_PADDING == NS_STYLE_IMAGELAYER_ORIGIN_PADDING &&
-              NS_STYLE_IMAGELAYER_CLIP_CONTENT == NS_STYLE_IMAGELAYER_ORIGIN_CONTENT,
-              "Except background-clip:text, all {background,mask}-clip and "
-              "{background,mask}-origin style constants must agree");
-
-const KTableEntry nsCSSProps::kImageLayerOriginKTable[] = {
-  { eCSSKeyword_border_box, NS_STYLE_IMAGELAYER_ORIGIN_BORDER },
-  { eCSSKeyword_padding_box, NS_STYLE_IMAGELAYER_ORIGIN_PADDING },
-  { eCSSKeyword_content_box, NS_STYLE_IMAGELAYER_ORIGIN_CONTENT },
+const KTableEntry nsCSSProps::kBackgroundOriginKTable[] = {
+  { eCSSKeyword_border_box, StyleGeometryBox::Border },
+  { eCSSKeyword_padding_box, StyleGeometryBox::Padding },
+  { eCSSKeyword_content_box, StyleGeometryBox::Content },
   { eCSSKeyword_UNKNOWN, -1 }
 };
 
 KTableEntry nsCSSProps::kBackgroundClipKTable[] = {
-  { eCSSKeyword_border_box, NS_STYLE_IMAGELAYER_CLIP_BORDER },
-  { eCSSKeyword_padding_box, NS_STYLE_IMAGELAYER_CLIP_PADDING },
-  { eCSSKeyword_content_box, NS_STYLE_IMAGELAYER_CLIP_CONTENT },
+  { eCSSKeyword_border_box, StyleGeometryBox::Border },
+  { eCSSKeyword_padding_box, StyleGeometryBox::Padding },
+  { eCSSKeyword_content_box, StyleGeometryBox::Content },
   // The next entry is controlled by the layout.css.background-clip-text.enabled
   // pref.
-  { eCSSKeyword_text, NS_STYLE_IMAGELAYER_CLIP_TEXT },
+  { eCSSKeyword_text, StyleGeometryBox::Text },
   { eCSSKeyword_UNKNOWN, -1 }
 };
 
-static_assert(MOZ_ARRAY_LENGTH(nsCSSProps::kImageLayerOriginKTable) ==
-              MOZ_ARRAY_LENGTH(nsCSSProps::kBackgroundClipKTable) - 1,
-              "background-clip has one extra value, which is text, compared"
-              "to {background,mask}-origin");
+const KTableEntry nsCSSProps::kMaskOriginKTable[] = {
+  { eCSSKeyword_border_box, StyleGeometryBox::Border },
+  { eCSSKeyword_padding_box, StyleGeometryBox::Padding },
+  { eCSSKeyword_content_box, StyleGeometryBox::Content },
+  { eCSSKeyword_fill_box, StyleGeometryBox::Fill },
+  { eCSSKeyword_stroke_box, StyleGeometryBox::Stroke },
+  { eCSSKeyword_view_box, StyleGeometryBox::View },
+  { eCSSKeyword_UNKNOWN, -1 }
+};
+
+const KTableEntry nsCSSProps::kMaskClipKTable[] = {
+  { eCSSKeyword_border_box, StyleGeometryBox::Border },
+  { eCSSKeyword_padding_box, StyleGeometryBox::Padding },
+  { eCSSKeyword_content_box, StyleGeometryBox::Content },
+  { eCSSKeyword_fill_box, StyleGeometryBox::Fill },
+  { eCSSKeyword_stroke_box, StyleGeometryBox::Stroke },
+  { eCSSKeyword_view_box, StyleGeometryBox::View },
+  { eCSSKeyword_no_clip, StyleGeometryBox::NoClip },
+  { eCSSKeyword_UNKNOWN, -1 }
+};
 
 // Note: Don't change this table unless you update
 // ParseImageLayerPosition!
@@ -2346,13 +2356,13 @@ const KTableEntry nsCSSProps::kFillRuleKTable[] = {
 };
 
 const KTableEntry nsCSSProps::kClipPathGeometryBoxKTable[] = {
-  { eCSSKeyword_content_box, StyleClipPathGeometryBox::Content },
-  { eCSSKeyword_padding_box, StyleClipPathGeometryBox::Padding },
-  { eCSSKeyword_border_box, StyleClipPathGeometryBox::Border },
-  { eCSSKeyword_margin_box, StyleClipPathGeometryBox::Margin },
-  { eCSSKeyword_fill_box, StyleClipPathGeometryBox::Fill },
-  { eCSSKeyword_stroke_box, StyleClipPathGeometryBox::Stroke },
-  { eCSSKeyword_view_box, StyleClipPathGeometryBox::View },
+  { eCSSKeyword_content_box, StyleGeometryBox::Content },
+  { eCSSKeyword_padding_box, StyleGeometryBox::Padding },
+  { eCSSKeyword_border_box, StyleGeometryBox::Border },
+  { eCSSKeyword_margin_box, StyleGeometryBox::Margin },
+  { eCSSKeyword_fill_box, StyleGeometryBox::Fill },
+  { eCSSKeyword_stroke_box, StyleGeometryBox::Stroke },
+  { eCSSKeyword_view_box, StyleGeometryBox::View },
   { eCSSKeyword_UNKNOWN, -1 }
 };
 
@@ -3051,7 +3061,6 @@ static const nsCSSPropertyID gScrollSnapTypeSubpropTable[] = {
   eCSSProperty_scroll_snap_type_y,
   eCSSProperty_UNKNOWN
 };
-#ifdef MOZ_ENABLE_MASK_AS_SHORTHAND
 static const nsCSSPropertyID gMaskSubpropTable[] = {
   eCSSProperty_mask_image,
   eCSSProperty_mask_repeat,
@@ -3069,7 +3078,6 @@ static const nsCSSPropertyID gMaskPositionSubpropTable[] = {
   eCSSProperty_mask_position_y,
   eCSSProperty_UNKNOWN
 };
-#endif
 // FIXME: mask-border tables should be added when we implement
 // mask-border properties.
 
diff --git a/layout/style/nsCSSProps.h b/layout/style/nsCSSProps.h
index dfe35afd8..e67e1d41d 100644
--- a/layout/style/nsCSSProps.h
+++ b/layout/style/nsCSSProps.h
@@ -717,6 +717,8 @@ public:
   static const KTableEntry kTransformStyleKTable[];
   static const KTableEntry kImageLayerAttachmentKTable[];
   static const KTableEntry kImageLayerOriginKTable[];
+  static const KTableEntry kBackgroundOriginKTable[];
+  static const KTableEntry kMaskOriginKTable[];
   static const KTableEntry kImageLayerPositionKTable[];
   static const KTableEntry kImageLayerRepeatKTable[];
   static const KTableEntry kImageLayerRepeatPartKTable[];
@@ -726,6 +728,7 @@ public:
   // Not const because we modify its entries when the pref
   // "layout.css.background-clip.text" changes:
   static KTableEntry kBackgroundClipKTable[];
+  static const KTableEntry kMaskClipKTable[];
   static const KTableEntry kBlendModeKTable[];
   static const KTableEntry kBorderCollapseKTable[];
   static const KTableEntry kBorderImageRepeatKTable[];
diff --git a/layout/style/nsComputedDOMStyle.cpp b/layout/style/nsComputedDOMStyle.cpp
index 4f8d3edf6..36c3a6385 100644
--- a/layout/style/nsComputedDOMStyle.cpp
+++ b/layout/style/nsComputedDOMStyle.cpp
@@ -74,6 +74,30 @@ NS_NewComputedDOMStyle(dom::Element* aElement, const nsAString& aPseudoElt,
   return computedStyle.forget();
 }
 
+static nsDOMCSSValueList*
+GetROCSSValueList(bool aCommaDelimited)
+{
+  return new nsDOMCSSValueList(aCommaDelimited, true);
+}
+
+template<typename T>
+already_AddRefed<CSSValue>
+GetBackgroundList(T nsStyleImageLayers::Layer::* aMember,
+                  uint32_t nsStyleImageLayers::* aCount,
+                  const nsStyleImageLayers& aLayers,
+                  const KTableEntry aTable[])
+{
+  RefPtr<nsDOMCSSValueList> valueList = GetROCSSValueList(true);
+
+  for (uint32_t i = 0, i_end = aLayers.*aCount; i < i_end; ++i) {
+    RefPtr<nsROCSSPrimitiveValue> val = new nsROCSSPrimitiveValue;
+    val->SetIdent(nsCSSProps::ValueToKeywordEnum(aLayers.mLayers[i].*aMember, aTable));
+    valueList->AppendCSSValue(val.forget());
+  }
+
+  return valueList.forget();
+}
+
 /**
  * An object that represents the ordered set of properties that are exposed on
  * an nsComputedDOMStyle object and how their computed values can be obtained.
@@ -1803,24 +1827,6 @@ nsComputedDOMStyle::DoGetFontVariantPosition()
 }
 
 already_AddRefed<CSSValue>
-nsComputedDOMStyle::GetBackgroundList(uint8_t nsStyleImageLayers::Layer::* aMember,
-                                      uint32_t nsStyleImageLayers::* aCount,
-                                      const nsStyleImageLayers& aLayers,
-                                      const KTableEntry aTable[])
-{
-  RefPtr<nsDOMCSSValueList> valueList = GetROCSSValueList(true);
-
-  for (uint32_t i = 0, i_end = aLayers.*aCount; i < i_end; ++i) {
-    RefPtr<nsROCSSPrimitiveValue> val = new nsROCSSPrimitiveValue;
-    val->SetIdent(nsCSSProps::ValueToKeywordEnum(aLayers.mLayers[i].*aMember,
-                                                 aTable));
-    valueList->AppendCSSValue(val.forget());
-  }
-
-  return valueList.forget();
-}
-
-already_AddRefed<CSSValue>
 nsComputedDOMStyle::DoGetBackgroundAttachment()
 {
   return GetBackgroundList(&nsStyleImageLayers::Layer::mAttachment,
@@ -2367,7 +2373,7 @@ nsComputedDOMStyle::DoGetBackgroundOrigin()
   return GetBackgroundList(&nsStyleImageLayers::Layer::mOrigin,
                            &nsStyleImageLayers::mOriginCount,
                            StyleBackground()->mImage,
-                           nsCSSProps::kImageLayerOriginKTable);
+                           nsCSSProps::kBackgroundOriginKTable);
 }
 
 void
@@ -5013,12 +5019,6 @@ nsComputedDOMStyle::DoGetTop()
   return GetOffsetWidthFor(NS_SIDE_TOP);
 }
 
-nsDOMCSSValueList*
-nsComputedDOMStyle::GetROCSSValueList(bool aCommaDelimited)
-{
-  return new nsDOMCSSValueList(aCommaDelimited, true);
-}
-
 already_AddRefed<CSSValue>
 nsComputedDOMStyle::GetOffsetWidthFor(mozilla::css::Side aSide)
 {
@@ -6180,8 +6180,8 @@ nsComputedDOMStyle::DoGetMask()
   // need to support computed style for the cases where it used to be
   // a longhand.
   if (svg->mMask.mImageCount > 1 ||
-      firstLayer.mClip != NS_STYLE_IMAGELAYER_CLIP_BORDER ||
-      firstLayer.mOrigin != NS_STYLE_IMAGELAYER_ORIGIN_BORDER ||
+      firstLayer.mClip != StyleGeometryBox::Border ||
+      firstLayer.mOrigin != StyleGeometryBox::Border ||
       firstLayer.mComposite != NS_STYLE_MASK_COMPOSITE_ADD ||
       firstLayer.mMaskMode != NS_STYLE_MASK_MODE_MATCH_SOURCE ||
       !nsStyleImageLayers::IsInitialPositionForLayerType(
@@ -6200,14 +6200,13 @@ nsComputedDOMStyle::DoGetMask()
   return val.forget();
 }
 
-#ifdef MOZ_ENABLE_MASK_AS_SHORTHAND
 already_AddRefed<CSSValue>
 nsComputedDOMStyle::DoGetMaskClip()
 {
   return GetBackgroundList(&nsStyleImageLayers::Layer::mClip,
                            &nsStyleImageLayers::mClipCount,
                            StyleSVGReset()->mMask,
-                           nsCSSProps::kImageLayerOriginKTable);
+                           nsCSSProps::kMaskClipKTable);
 }
 
 already_AddRefed<CSSValue>
@@ -6241,7 +6240,7 @@ nsComputedDOMStyle::DoGetMaskOrigin()
   return GetBackgroundList(&nsStyleImageLayers::Layer::mOrigin,
                            &nsStyleImageLayers::mOriginCount,
                            StyleSVGReset()->mMask,
-                           nsCSSProps::kImageLayerOriginKTable);
+                           nsCSSProps::kMaskOriginKTable);
 }
 
 already_AddRefed<CSSValue>
@@ -6278,7 +6277,6 @@ nsComputedDOMStyle::DoGetMaskSize()
   const nsStyleImageLayers& layers = StyleSVGReset()->mMask;
   return DoGetImageLayerSize(layers);
 }
-#endif
 
 already_AddRefed<CSSValue>
 nsComputedDOMStyle::DoGetMaskType()
diff --git a/layout/style/nsComputedDOMStyle.h b/layout/style/nsComputedDOMStyle.h
index 27e2086e9..77df71ec8 100644
--- a/layout/style/nsComputedDOMStyle.h
+++ b/layout/style/nsComputedDOMStyle.h
@@ -53,6 +53,7 @@ private:
   // Convenience typedefs:
   typedef nsCSSProps::KTableEntry KTableEntry;
   typedef mozilla::dom::CSSValue CSSValue;
+  typedef mozilla::StyleGeometryBox StyleGeometryBox;
 
 public:
   NS_DECL_CYCLE_COLLECTING_ISUPPORTS
@@ -202,12 +203,6 @@ private:
                                                const nscolor& aDefaultColor,
                                                bool aIsBoxShadow);
 
-  already_AddRefed<CSSValue> GetBackgroundList(
-    uint8_t nsStyleImageLayers::Layer::* aMember,
-    uint32_t nsStyleImageLayers::* aCount,
-    const nsStyleImageLayers& aLayers,
-    const KTableEntry aTable[]);
-
   void GetCSSGradientString(const nsStyleGradient* aGradient,
                             nsAString& aString);
   void GetImageRectString(nsIURI* aURI,
@@ -310,7 +305,6 @@ private:
 
   /* Mask properties */
   already_AddRefed<CSSValue> DoGetMask();
-#ifdef MOZ_ENABLE_MASK_AS_SHORTHAND
   already_AddRefed<CSSValue> DoGetMaskImage();
   already_AddRefed<CSSValue> DoGetMaskPosition();
   already_AddRefed<CSSValue> DoGetMaskPositionX();
@@ -321,7 +315,7 @@ private:
   already_AddRefed<CSSValue> DoGetMaskSize();
   already_AddRefed<CSSValue> DoGetMaskMode();
   already_AddRefed<CSSValue> DoGetMaskComposite();
-#endif
+
   /* Padding properties */
   already_AddRefed<CSSValue> DoGetPaddingTop();
   already_AddRefed<CSSValue> DoGetPaddingBottom();
@@ -582,8 +576,6 @@ private:
   /* Custom properties */
   already_AddRefed<CSSValue> DoGetCustomProperty(const nsAString& aPropertyName);
 
-  nsDOMCSSValueList* GetROCSSValueList(bool aCommaDelimited);
-
   /* Helper functions */
   void SetToRGBAColor(nsROCSSPrimitiveValue* aValue, nscolor aColor);
   void SetValueFromComplexColor(nsROCSSPrimitiveValue* aValue,
diff --git a/layout/style/nsComputedDOMStylePropertyList.h b/layout/style/nsComputedDOMStylePropertyList.h
index 1983208ac..825976b58 100644
--- a/layout/style/nsComputedDOMStylePropertyList.h
+++ b/layout/style/nsComputedDOMStylePropertyList.h
@@ -332,7 +332,6 @@ COMPUTED_STYLE_PROP(marker_end,                    MarkerEnd)
 COMPUTED_STYLE_PROP(marker_mid,                    MarkerMid)
 COMPUTED_STYLE_PROP(marker_start,                  MarkerStart)
 COMPUTED_STYLE_PROP(mask,                          Mask)
-#ifdef MOZ_ENABLE_MASK_AS_SHORTHAND
 COMPUTED_STYLE_PROP(mask_clip,                     MaskClip)
 COMPUTED_STYLE_PROP(mask_composite,                MaskComposite)
 COMPUTED_STYLE_PROP(mask_image,                    MaskImage)
@@ -343,7 +342,6 @@ COMPUTED_STYLE_PROP(mask_position_x,               MaskPositionX)
 COMPUTED_STYLE_PROP(mask_position_y,               MaskPositionY)
 COMPUTED_STYLE_PROP(mask_repeat,                   MaskRepeat)
 COMPUTED_STYLE_PROP(mask_size,                     MaskSize)
-#endif
 COMPUTED_STYLE_PROP(mask_type,                     MaskType)
 COMPUTED_STYLE_PROP(paint_order,                   PaintOrder)
 COMPUTED_STYLE_PROP(shape_rendering,               ShapeRendering)
diff --git a/layout/style/nsRuleNode.cpp b/layout/style/nsRuleNode.cpp
index 9b9fc3948..6bcef02a0 100644
--- a/layout/style/nsRuleNode.cpp
+++ b/layout/style/nsRuleNode.cpp
@@ -22,6 +22,7 @@
 #include "mozilla/Unused.h"
 
 #include "mozilla/css/Declaration.h"
+#include "mozilla/TypeTraits.h"
 
 #include "nsAlgorithm.h" // for clamped()
 #include "nsRuleNode.h"
@@ -6800,6 +6801,21 @@ struct BackgroundItemComputer<nsCSSValueList, RefPtr<css::URLValueData>>
   }
 };
 
+template <typename T>
+struct BackgroundItemComputer<nsCSSValueList, T>
+{
+  typedef typename EnableIf<IsEnum<T>::value, T>::Type ComputedType;
+
+  static void ComputeValue(nsStyleContext* aStyleContext,
+                           const nsCSSValueList* aSpecifiedValue,
+                           ComputedType& aComputedValue,
+                           RuleNodeCacheConditions& aConditions)
+  {
+    aComputedValue =
+      static_cast<T>(aSpecifiedValue->mValue.GetIntValue());
+  }
+};
+
 /* Helper function for ComputePositionValue.
  * This function computes a single PositionCoord from two nsCSSValue objects,
  * which represent an edge and an offset from that edge.
@@ -7353,7 +7369,7 @@ nsRuleNode::ComputeBackgroundData(void* aStartStruct,
                     bg->mImage.mLayers,
                     parentBG->mImage.mLayers,
                     &nsStyleImageLayers::Layer::mClip,
-                    uint8_t(NS_STYLE_IMAGELAYER_CLIP_BORDER),
+                    StyleGeometryBox::Border,
                     parentBG->mImage.mClipCount,
                     bg->mImage.mClipCount, maxItemCount, rebuild, conditions);
 
@@ -7372,7 +7388,7 @@ nsRuleNode::ComputeBackgroundData(void* aStartStruct,
                     bg->mImage.mLayers,
                     parentBG->mImage.mLayers,
                     &nsStyleImageLayers::Layer::mOrigin,
-                    uint8_t(NS_STYLE_IMAGELAYER_ORIGIN_PADDING),
+                    StyleGeometryBox::Padding,
                     parentBG->mImage.mOriginCount,
                     bg->mImage.mOriginCount, maxItemCount, rebuild,
                     conditions);
@@ -10005,7 +10021,6 @@ nsRuleNode::ComputeSVGResetData(void* aStartStruct,
            parentSVGReset->mMaskType,
            NS_STYLE_MASK_TYPE_LUMINANCE);
 
-#ifdef MOZ_ENABLE_MASK_AS_SHORTHAND
   uint32_t maxItemCount = 1;
   bool rebuild = false;
 
@@ -10043,7 +10058,7 @@ nsRuleNode::ComputeSVGResetData(void* aStartStruct,
                     svgReset->mMask.mLayers,
                     parentSVGReset->mMask.mLayers,
                     &nsStyleImageLayers::Layer::mClip,
-                    uint8_t(NS_STYLE_IMAGELAYER_CLIP_BORDER),
+                    StyleGeometryBox::Border,
                     parentSVGReset->mMask.mClipCount,
                     svgReset->mMask.mClipCount, maxItemCount, rebuild,
                     conditions);
@@ -10053,7 +10068,7 @@ nsRuleNode::ComputeSVGResetData(void* aStartStruct,
                     svgReset->mMask.mLayers,
                     parentSVGReset->mMask.mLayers,
                     &nsStyleImageLayers::Layer::mOrigin,
-                    uint8_t(NS_STYLE_IMAGELAYER_ORIGIN_BORDER),
+                    StyleGeometryBox::Border,
                     parentSVGReset->mMask.mOriginCount,
                     svgReset->mMask.mOriginCount, maxItemCount, rebuild,
                     conditions);
@@ -10113,21 +10128,6 @@ nsRuleNode::ComputeSVGResetData(void* aStartStruct,
   if (rebuild) {
     FillAllBackgroundLists(svgReset->mMask, maxItemCount);
   }
-#else
-  // mask: none | <url>
-  const nsCSSValue* maskValue = aRuleData->ValueForMask();
-  if (eCSSUnit_URL == maskValue->GetUnit()) {
-    svgReset->mMask.mLayers[0].mSourceURI = maskValue->GetURLStructValue();
-  } else if (eCSSUnit_None == maskValue->GetUnit() ||
-             eCSSUnit_Initial == maskValue->GetUnit() ||
-             eCSSUnit_Unset == maskValue->GetUnit()) {
-    svgReset->mMask.mLayers[0].mSourceURI = nullptr;
-  } else if (eCSSUnit_Inherit == maskValue->GetUnit()) {
-    conditions.SetUncacheable();
-    svgReset->mMask.mLayers[0].mSourceURI =
-      parentSVGReset->mMask.mLayers[0].mSourceURI;
-  }
-#endif
 
   COMPUTE_END_RESET(SVGReset, svgReset)
 }
diff --git a/layout/style/nsStyleConsts.h b/layout/style/nsStyleConsts.h
index be588113e..6d207aec9 100644
--- a/layout/style/nsStyleConsts.h
+++ b/layout/style/nsStyleConsts.h
@@ -134,16 +134,35 @@ enum class StyleClear : uint8_t {
   Max = 13  // Max = (Both | Line)
 };
 
-// clip-path geometry box
-enum class StyleClipPathGeometryBox : uint8_t {
-  NoBox,
+// Define geometry box for clip-path's reference-box, background-clip,
+// background-origin, mask-clip and mask-origin.
+enum class StyleGeometryBox : uint8_t {
   Content,
   Padding,
   Border,
-  Margin,
-  Fill,
-  Stroke,
-  View,
+  Margin,  // XXX Bug 1260094 comment 9.
+           // Although margin-box is required by mask-origin and mask-clip, we
+           // do not implement that due to lack of support in other browsers.
+           // clip-path reference-box only.
+  Fill,    // mask-clip, mask-origin and clip-path reference-box only.
+  Stroke,  // mask-clip, mask-origin and clip-path reference-box only.
+  View,    // mask-clip, mask-origin and clip-path reference-box only.
+  NoClip,  // mask-clip only.
+  Text,    // background-clip only.
+  NoBox,   // Depending on which kind of element this style value applied on,
+           // the default value of a reference-box can be different.
+           // For an HTML element, the default value of reference-box is
+           // border-box; for an SVG element, the default value is fill-box.
+           // Since we can not determine the default value at parsing time,
+           // set it as NoBox so that we make a decision later.
+           // clip-path reference-box only.
+  MozAlmostPadding = 127 // A magic value that we use for our "pretend that
+                         // background-clip is 'padding' when we have a solid
+                         // border" optimization.  This isn't actually equal
+                         // to StyleGeometryBox::Padding because using that
+                         // causes antialiasing seams between the background
+                         // and border.
+                         // background-clip only.
 };
 
 // fill-rule
@@ -359,14 +378,6 @@ enum class FillMode : uint32_t;
 #define NS_STYLE_IMAGELAYER_ATTACHMENT_FIXED         1
 #define NS_STYLE_IMAGELAYER_ATTACHMENT_LOCAL         2
 
-// See nsStyleImageLayers
-// Code depends on these constants having the same values as IMAGELAYER_ORIGIN_*
-#define NS_STYLE_IMAGELAYER_CLIP_BORDER              0
-#define NS_STYLE_IMAGELAYER_CLIP_PADDING             1
-#define NS_STYLE_IMAGELAYER_CLIP_CONTENT             2
-// One extra constant which does not exist in IMAGELAYER_ORIGIN_*
-#define NS_STYLE_IMAGELAYER_CLIP_TEXT                3
-
 // A magic value that we use for our "pretend that background-clip is
 // 'padding' when we have a solid border" optimization.  This isn't
 // actually equal to NS_STYLE_IMAGELAYER_CLIP_PADDING because using that
@@ -375,12 +386,6 @@ enum class FillMode : uint32_t;
 #define NS_STYLE_IMAGELAYER_CLIP_MOZ_ALMOST_PADDING  127
 
 // See nsStyleImageLayers
-// Code depends on these constants having the same values as BG_CLIP_*
-#define NS_STYLE_IMAGELAYER_ORIGIN_BORDER            0
-#define NS_STYLE_IMAGELAYER_ORIGIN_PADDING           1
-#define NS_STYLE_IMAGELAYER_ORIGIN_CONTENT           2
-
-// See nsStyleImageLayers
 // The parser code depends on |ing these values together.
 #define NS_STYLE_IMAGELAYER_POSITION_CENTER          (1<<0)
 #define NS_STYLE_IMAGELAYER_POSITION_TOP             (1<<1)
diff --git a/layout/style/nsStyleStruct.cpp b/layout/style/nsStyleStruct.cpp
index 52491a288..72c103724 100644
--- a/layout/style/nsStyleStruct.cpp
+++ b/layout/style/nsStyleStruct.cpp
@@ -2465,7 +2465,6 @@ const nsCSSPropertyID nsStyleImageLayers::kBackgroundLayerTable[] = {
   eCSSProperty_UNKNOWN                    // composite
 };
 
-#ifdef MOZ_ENABLE_MASK_AS_SHORTHAND
 const nsCSSPropertyID nsStyleImageLayers::kMaskLayerTable[] = {
   eCSSProperty_mask,                      // shorthand
   eCSSProperty_UNKNOWN,                   // color
@@ -2480,7 +2479,6 @@ const nsCSSPropertyID nsStyleImageLayers::kMaskLayerTable[] = {
   eCSSProperty_mask_mode,                 // maskMode
   eCSSProperty_mask_composite             // composite
 };
-#endif
 
 nsStyleImageLayers::nsStyleImageLayers(nsStyleImageLayers::LayerType aType)
   : mAttachmentCount(1)
@@ -2787,7 +2785,7 @@ nsStyleImageLayers::Size::operator==(const Size& aOther) const
 }
 
 nsStyleImageLayers::Layer::Layer()
-  : mClip(NS_STYLE_IMAGELAYER_CLIP_BORDER)
+  : mClip(StyleGeometryBox::Border)
   , mAttachment(NS_STYLE_IMAGELAYER_ATTACHMENT_SCROLL)
   , mBlendMode(NS_STYLE_BLEND_NORMAL)
   , mComposite(NS_STYLE_MASK_COMPOSITE_ADD)
@@ -2809,10 +2807,10 @@ nsStyleImageLayers::Layer::Initialize(nsStyleImageLayers::LayerType aType)
   mPosition.SetInitialPercentValues(0.0f);
 
   if (aType == LayerType::Background) {
-    mOrigin = NS_STYLE_IMAGELAYER_ORIGIN_PADDING;
+    mOrigin = StyleGeometryBox::Padding;
   } else {
     MOZ_ASSERT(aType == LayerType::Mask, "unsupported layer type.");
-    mOrigin = NS_STYLE_IMAGELAYER_ORIGIN_BORDER;
+    mOrigin = StyleGeometryBox::Border;
   }
 }
 
diff --git a/layout/style/nsStyleStruct.h b/layout/style/nsStyleStruct.h
index 1cadea840..c8182b8f1 100644
--- a/layout/style/nsStyleStruct.h
+++ b/layout/style/nsStyleStruct.h
@@ -782,6 +782,8 @@ struct nsStyleImageLayers {
   struct Layer;
   friend struct Layer;
   struct Layer {
+    typedef mozilla::StyleGeometryBox StyleGeometryBox;
+
     nsStyleImage  mImage;         // [reset]
     RefPtr<mozilla::css::URLValueData> mSourceURI;  // [reset]
                                   // mask-only property
@@ -793,9 +795,9 @@ struct nsStyleImageLayers {
                                   // or an ImageValue.)
     mozilla::Position mPosition;  // [reset]
     Size          mSize;          // [reset]
-    uint8_t       mClip;          // [reset] See nsStyleConsts.h
+    StyleGeometryBox  mClip;      // [reset] See nsStyleConsts.h
     MOZ_INIT_OUTSIDE_CTOR
-      uint8_t     mOrigin;        // [reset] See nsStyleConsts.h
+      StyleGeometryBox mOrigin;   // [reset] See nsStyleConsts.h
     uint8_t       mAttachment;    // [reset] See nsStyleConsts.h
                                   // background-only property
                                   // This property is used for background layer
@@ -2755,7 +2757,7 @@ private:
   ReferenceBox mReferenceBox = ReferenceBox::NoBox;
 };
 
-using StyleClipPath = StyleShapeSource<StyleClipPathGeometryBox>;
+using StyleClipPath = StyleShapeSource<StyleGeometryBox>;
 using StyleShapeOutside = StyleShapeSource<StyleShapeOutsideShapeBox>;
 
 } // namespace mozilla