Bug 1817071 - Remove -moz-image-region support from layout. r=layout-reviewers,tnikkel

There are no users of non-auto values, so we can just simplify some code and
remove the property.

Differential Revision: https://phabricator.services.mozilla.com/D170010

devtools/server/actors/animation-type-longhand.js

@@ -310,7 +310,6 @@ exports.ANIMATION_TYPE_FOR_LONGHANDS = [
       "font-stretch",
       "font-variation-settings",
       "font-weight",
-      "-moz-image-region",
       "mask-position-x",
       "mask-position-y",
       "mask-size",

devtools/shared/css/generated/properties-db.js

@@ -782,22 +782,6 @@ exports.CSS_PROPERTIES = {
       "unset"
     ]
   },
-  "-moz-image-region": {
-    "isInherited": true,
-    "subproperties": [
-      "-moz-image-region"
-    ],
-    "supports": [],
-    "values": [
-      "auto",
-      "inherit",
-      "initial",
-      "rect",
-      "revert",
-      "revert-layer",
-      "unset"
-    ]
-  },
   "-moz-margin-end": {
     "isInherited": false,
     "subproperties": [
@@ -3142,7 +3126,6 @@ exports.CSS_PROPERTIES = {
       "list-style-type",
       "list-style-image",
       "quotes",
-      "-moz-image-region",
       "margin-top",
       "margin-right",
       "margin-bottom",

layout/base/nsLayoutUtils.cpp

@@ -6424,8 +6424,7 @@ ImgDrawResult nsLayoutUtils::DrawSingleImage(
     gfxContext& aContext, nsPresContext* aPresContext, imgIContainer* aImage,
     SamplingFilter aSamplingFilter, const nsRect& aDest, const nsRect& aDirty,
     const SVGImageContext& aSVGContext, uint32_t aImageFlags,
-    const nsPoint* aAnchorPoint, const nsRect* aSourceArea) {
-  nscoord appUnitsPerCSSPixel = AppUnitsPerCSSPixel();
+    const nsPoint* aAnchorPoint) {
   // NOTE(emilio): We can hardcode resolution to 1 here, since we're interested
   // in the actual image pixels, for snapping purposes, not on the adjusted
   // size.
@@ -6437,35 +6436,18 @@ ImgDrawResult nsLayoutUtils::DrawSingleImage(
     return ImgDrawResult::SUCCESS;  // no point in drawing a zero size image
   }
 
-  nsSize imageSize(CSSPixel::ToAppUnits(pixelImageSize));
-  nsRect source;
-  nsCOMPtr<imgIContainer> image;
-  if (aSourceArea) {
-    source = *aSourceArea;
-    nsIntRect subRect(source.x, source.y, source.width, source.height);
-    subRect.ScaleInverseRoundOut(appUnitsPerCSSPixel);
-    image = ImageOps::Clip(aImage, subRect);
-
-    nsRect imageRect;
-    imageRect.SizeTo(imageSize);
-    nsRect clippedSource = imageRect.Intersect(source);
-
-    source -= clippedSource.TopLeft();
-    imageSize = clippedSource.Size();
-  } else {
-    source.SizeTo(imageSize);
-    image = aImage;
-  }
-
-  nsRect dest = GetWholeImageDestination(imageSize, source, aDest);
+  const nsSize imageSize(CSSPixel::ToAppUnits(pixelImageSize));
+  const nsRect source(nsPoint(), imageSize);
+  const nsRect dest = GetWholeImageDestination(imageSize, source, aDest);
 
   // Ensure that only a single image tile is drawn. If aSourceArea extends
   // outside the image bounds, we want to honor the aSourceArea-to-aDest
   // transform but we don't want to actually tile the image.
   nsRect fill;
   fill.IntersectRect(aDest, dest);
-  return DrawImageInternal(aContext, aPresContext, image, aSamplingFilter, dest,
-                           fill, aAnchorPoint ? *aAnchorPoint : fill.TopLeft(),
+  return DrawImageInternal(aContext, aPresContext, aImage, aSamplingFilter,
+                           dest, fill,
+                           aAnchorPoint ? *aAnchorPoint : fill.TopLeft(),
                            aDirty, aSVGContext, aImageFlags);
 }
 

layout/base/nsLayoutUtils.h

@@ -1951,17 +1951,12 @@ class nsLayoutUtils {
    *                            variety.
    *   @param aAnchor           If non-null, a point which we will ensure
    *                            is pixel-aligned in the output.
-   *   @param aSourceArea       If non-null, this area is extracted from
-   *                            the image and drawn in aDest. It's
-   *                            in appunits. For best results it should
-   *                            be aligned with image pixels.
    */
   static ImgDrawResult DrawSingleImage(
       gfxContext& aContext, nsPresContext* aPresContext, imgIContainer* aImage,
       SamplingFilter aSamplingFilter, const nsRect& aDest, const nsRect& aDirty,
       const mozilla::SVGImageContext& aSVGContext, uint32_t aImageFlags,
-      const nsPoint* aAnchorPoint = nullptr,
-      const nsRect* aSourceArea = nullptr);
+      const nsPoint* aAnchorPoint = nullptr);
 
   /**
    * Given an imgIContainer, this method attempts to obtain an intrinsic

layout/reftests/bugs/463217-1-ref.xhtml

@@ -1,6 +1,6 @@
 <?xml version="1.0"?>
 <window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
-  <vbox style="height:204px; border:2px solid blue;" flex="0">
+  <vbox style="border:2px solid blue;" flex="0">
     <image style="list-style-image: url(mozilla-banner.gif);"/>
   </vbox>
   <vbox/>

layout/reftests/bugs/463217-1.xhtml

@@ -1,4 +1,4 @@
 <?xml version="1.0"?>
 <window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
-  <image style="border:2px solid blue; list-style-image: url(mozilla-banner.gif); -moz-image-region: rect(0 600px 200px 0);"/>
+  <image style="border:2px solid blue; list-style-image: url(mozilla-banner.gif);"/>
 </window>

layout/reftests/bugs/reftest.list

@@ -1203,7 +1203,7 @@ fuzzy(0-1,0-34360) == 461512-1.html 461512-1-ref.html
 == 462844-3.html 462844-ref.html
 == 462844-4.html 462844-ref.html
 == 463204-1.html 463204-1-ref.html
-fuzzy-if(!useDrawSnapshot,16-16,3345-4100) == chrome://reftest/content/bugs/463217-1.xhtml chrome://reftest/content/bugs/463217-1-ref.xhtml
+== chrome://reftest/content/bugs/463217-1.xhtml chrome://reftest/content/bugs/463217-1-ref.xhtml
 == 463952-1.html 463952-1-ref.html
 == 464811-1.html 464811-1-ref.html
 == 465574-1.html 465574-1-ref.html # bug 421436

layout/reftests/image-region/image-region-ref.xhtml

@@ -1,14 +0,0 @@
-<?xml version="1.0"?>
-<!--
-    Any copyright is dedicated to the Public Domain.
-    http://creativecommons.org/licenses/publicdomain/
-    -->
-<?xml-stylesheet href="image-region.css" type="text/css"?>
-<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
-        id="main"
-        class="reftest-image-region">
-  <hbox id="ref">
-    <image id="image1" />
-    <hbox style="-moz-box-flex: 1000" />
-  </hbox>
-</window>

layout/reftests/image-region/image-region.css

@@ -1,19 +0,0 @@
-/*
-    Any copyright is dedicated to the Public Domain.
-    http://creativecommons.org/licenses/publicdomain/
-    */
-hbox#test > image {
-  list-style-image: url("image-region.png");
-}
-
-hbox#test > #image1 {
-  -moz-image-region: rect(1px, 19px, 9px, 1px);
-}
-
-hbox#ref > image {
-  list-style-image: none;
-}
-
-hbox#ref > #image1 {
-  list-style-image: url("image-region-ref.png");
-}

layout/reftests/image-region/image-region.xhtml

@@ -1,14 +0,0 @@
-<?xml version="1.0"?>
-<!--
-    Any copyright is dedicated to the Public Domain.
-    http://creativecommons.org/licenses/publicdomain/
-    -->
-<?xml-stylesheet href="image-region.css" type="text/css"?>
-<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
-        id="main"
-        class="reftest-image-region">
-  <hbox id="test">
-    <image id="image1" />
-    <hbox style="-moz-box-flex: 1000" />
-  </hbox>
-</window>

layout/reftests/image-region/reftest.list

@@ -1 +0,0 @@
-== chrome://reftest/content/image-region/image-region.xhtml chrome://reftest/content/image-region/image-region-ref.xhtml

layout/reftests/reftest.list

@@ -243,9 +243,6 @@ include image-element/reftest.list
 # image-rect/
 include image-rect/reftest.list
 
-# image-region/
-include image-region/reftest.list
-
 # indic shaping with harfbuzz
 include indic-shaping/reftest.list
 

layout/style/crashtests/383979-2.html

@@ -15,7 +15,6 @@ function run()
 body { display: none } /* so we control the order of the ComputeListData calls */
 
 #s1, #s2, #s3 { 
-  -moz-image-region: auto;
   list-style-image: none;
   list-style-position: outside;
   list-style-type: disc;

layout/style/nsStyleStruct.cpp

@@ -601,8 +601,7 @@ nsChangeHint nsStyleOutline::CalcDifference(
 nsStyleList::nsStyleList(const Document& aDocument)
     : mListStylePosition(StyleListStylePosition::Outside),
       mQuotes(StyleQuotes::Auto()),
-      mListStyleImage(StyleImage::None()),
-      mImageRegion(StyleClipRectOrAuto::Auto()) {
+      mListStyleImage(StyleImage::None()) {
   MOZ_COUNT_CTOR(nsStyleList);
   MOZ_ASSERT(NS_IsMainThread());
 
@@ -615,8 +614,7 @@ nsStyleList::nsStyleList(const nsStyleList& aSource)
     : mListStylePosition(aSource.mListStylePosition),
       mCounterStyle(aSource.mCounterStyle),
       mQuotes(aSource.mQuotes),
-      mListStyleImage(aSource.mListStyleImage),
-      mImageRegion(aSource.mImageRegion) {
+      mListStyleImage(aSource.mListStyleImage) {
   MOZ_COUNT_CTOR(nsStyleList);
 }
 
@@ -656,14 +654,6 @@ nsChangeHint nsStyleList::CalcDifference(
   if (mListStyleImage != aNewData.mListStyleImage) {
     return NS_STYLE_HINT_REFLOW;
   }
-  if (mImageRegion != aNewData.mImageRegion) {
-    nsRect region = GetImageRegion();
-    nsRect newRegion = aNewData.GetImageRegion();
-    if (region.width != newRegion.width || region.height != newRegion.height) {
-      return NS_STYLE_HINT_REFLOW;
-    }
-    return NS_STYLE_HINT_VISUAL;
-  }
   return hint;
 }
 

layout/style/nsStyleStruct.h

@@ -708,13 +708,6 @@ struct MOZ_NEEDS_MEMMOVABLE_MEMBERS nsStyleList {
   nsChangeHint CalcDifference(const nsStyleList& aNewData,
                               const nsStyleDisplay& aOldDisplay) const;
 
-  nsRect GetImageRegion() const {
-    if (!mImageRegion.IsRect()) {
-      return nsRect();
-    }
-    return mImageRegion.AsRect().ToLayoutRect(0);
-  }
-
   already_AddRefed<nsIURI> GetListStyleImageURI() const;
 
   mozilla::StyleListStylePosition mListStylePosition;
@@ -722,9 +715,6 @@ struct MOZ_NEEDS_MEMMOVABLE_MEMBERS nsStyleList {
   mozilla::CounterStylePtr mCounterStyle;
   mozilla::StyleQuotes mQuotes;
   mozilla::StyleImage mListStyleImage;
-
-  // the rect to use within an image.
-  mozilla::StyleClipRectOrAuto mImageRegion;
 };
 
 struct MOZ_NEEDS_MEMMOVABLE_MEMBERS nsStylePage {

layout/style/test/property_database.js

@@ -2872,14 +2872,6 @@ var gCSSProperties = {
     other_values: ["1"],
     invalid_values: [],
   },
-  "-moz-image-region": {
-    domProp: "MozImageRegion",
-    inherited: true,
-    type: CSS_TYPE_LONGHAND,
-    initial_values: ["auto"],
-    other_values: ["rect(3px 20px 15px 4px)", "rect(17px, 21px, 33px, 2px)"],
-    invalid_values: ["rect(17px, 21px, 33, 2px)"],
-  },
   "margin-inline": {
     domProp: "marginInline",
     inherited: false,

layout/style/test/test_transitions_per_property.html

@@ -86,7 +86,6 @@ var supported_properties = {
             test_length_unclamped, test_percent_unclamped ],
     "cy": [ test_length_transition, test_percent_transition,
             test_length_unclamped, test_percent_unclamped ],
-    "-moz-image-region": [ test_rect_transition ],
     "background-color": [ test_color_transition,
                           test_currentcolor_transition ],
     "background-position": [ test_background_position_transition,

layout/xul/nsImageBoxFrame.cpp

@@ -69,7 +69,6 @@ using namespace mozilla::image;
 using namespace mozilla::layers;
 
 using mozilla::dom::Document;
-using mozilla::dom::Element;
 using mozilla::dom::ReferrerInfo;
 
 class nsImageBoxFrameEvent : public Runnable {
@@ -347,14 +346,12 @@ ImgDrawResult nsImageBoxFrame::PaintImage(gfxContext& aRenderingContext,
     return ImgDrawResult::TEMPORARY_ERROR;
   }
 
-  bool hasSubRect = !mUseSrcAttr && (mSubRect.width > 0 || mSubRect.height > 0);
-
   SVGImageContext svgContext;
   SVGImageContext::MaybeStoreContextPaint(svgContext, this, imgCon);
   return nsLayoutUtils::DrawSingleImage(
       aRenderingContext, PresContext(), imgCon,
       nsLayoutUtils::GetSamplingFilterForFrame(this), dest, dirty, svgContext,
-      aFlags, anchorPoint.ptrOr(nullptr), hasSubRect ? &mSubRect : nullptr);
+      aFlags, anchorPoint.ptrOr(nullptr));
 }
 
 ImgDrawResult nsImageBoxFrame::CreateWebRenderCommands(
@@ -500,13 +497,7 @@ bool nsDisplayXULImage::CreateWebRenderCommands(
   return true;
 }
 
-bool nsImageBoxFrame::CanOptimizeToImageLayer() {
-  bool hasSubRect = !mUseSrcAttr && (mSubRect.width > 0 || mSubRect.height > 0);
-  if (hasSubRect) {
-    return false;
-  }
-  return true;
-}
+bool nsImageBoxFrame::CanOptimizeToImageLayer() { return true; }
 
 const mozilla::StyleImage* nsImageBoxFrame::GetImageFromStyle(
     const ComputedStyle& aStyle) const {
@@ -545,9 +536,6 @@ void nsImageBoxFrame::DidSetComputedStyle(ComputedStyle* aOldStyle) {
   nsLeafBoxFrame::DidSetComputedStyle(aOldStyle);
 
   // Fetch our subrect.
-  const nsStyleList* myList = StyleList();
-  mSubRect = myList->GetImageRegion();  // before |mSuppressStyleCheck| test!
-
   if (mUseSrcAttr || mSuppressStyleCheck) {
     return;  // No more work required, since the image isn't specified by style.
   }
@@ -575,19 +563,14 @@ void nsImageBoxFrame::GetImageSize() {
  * Ok return our dimensions
  */
 nsSize nsImageBoxFrame::GetXULPrefSize(nsBoxLayoutState& aState) {
-  nsSize size(0, 0);
+  nsSize size;
   DISPLAY_PREF_SIZE(this, size);
   if (XULNeedsRecalc(mImageSize)) {
     GetImageSize();
   }
 
-  if (!mUseSrcAttr && (mSubRect.width > 0 || mSubRect.height > 0)) {
-    size = mSubRect.Size();
-  } else {
-    size = mImageSize;
-  }
-
-  nsSize intrinsicSize = size;
+  size = mImageSize;
+  const nsSize intrinsicSize = size;
 
   nsMargin borderPadding(0, 0, 0, 0);
   GetXULBorderAndPadding(borderPadding);

layout/xul/nsImageBoxFrame.h

@@ -127,8 +127,6 @@ class nsImageBoxFrame final : public nsLeafBoxFrame {
   void OnImageIsAnimated(imgIRequest* aRequest);
   void OnFrameUpdate(imgIRequest* aRequest);
 
-  nsRect mSubRect;  ///< If set, indicates that only the portion of the image
-                    ///< specified by the rect should be used.
   nsSize mIntrinsicSize;
   nsSize mImageSize;
 

layout/xul/reftest/image-size-ref.xhtml

@@ -96,20 +96,4 @@ div div { background: blue; display: inline; float: left; }
       src="image4x3.png" style="box-sizing: border-box; width: 112px; height: 88px; padding: 8px;"/>
 </html:div>
 
-<html:div><html:div
-      style="width: 20px; height: 15px;"/><html:div
-      style="width: 80px; height: 60px;"/><html:div
-      style="width: 40px; height: 30px;"/><html:div
-      style="width: 10px; height: 8px;"/><html:div
-      style="width: 10px; height: 8px;"/>
-</html:div>
-    
-<html:div><html:div style="width: 20px; height: 15px;"/></html:div>
-
-<html:div><html:div style="width: 20px; height: 15px;"/></html:div>
-
-<html:div><html:div style="box-sizing: border-box; width: 24px; height: 22px; border: 8px solid green;"/></html:div>
-
-<html:div><html:div style="box-sizing: border-box; width: 24px; height: 22px; border: 8px solid green;"/></html:div>
-
 </window>

layout/xul/reftest/image-size.xhtml

@@ -91,29 +91,4 @@
   <image src="image4x3.png" style="min-width: 90px; min-height: 76px; padding: 8px;"/>
   <image src="image4x3.png" style="min-width: 112px; min-height: 76px; padding: 8px;"/>
 </hbox>
-
-<hbox align="start">
-  <image style="width: auto; height: auto; list-style-image: url(image4x3.png); -moz-image-region: rect(5px, 25px, 20px, 5px);"/>
-  <image style="width: 80px; list-style-image: url(image4x3.png); -moz-image-region: rect(5px, 25px, 20px, 5px);"/>
-  <image style="height: 30px; list-style-image: url(image4x3.png); -moz-image-region: rect(5px, 25px, 20px, 5px);"/>
-  <image style="width: 10px; list-style-image: url(image4x3.png); -moz-image-region: rect(5px, 25px, 21px, 5px);"/>
-  <image style="height: 8px; list-style-image: url(image4x3.png); -moz-image-region: rect(5px, 25px, 21px, 5px);"/>
-</hbox>
-
-<hbox align="end">
-  <image style="max-width: 20px; list-style-image: url(image4x3.png); -moz-image-region: rect(5px, 25px, 20px, 5px);"/>
-</hbox>
-
-<hbox align="end">
-  <image style="max-height: 15px; list-style-image: url(image4x3.png); -moz-image-region: rect(5px, 25px, 20px, 5px);"/>
-</hbox>
-
-<hbox align="end">
-  <image style="width: 24px; list-style-image: url(image4x3.png); -moz-image-region: rect(5px, 25px, 20px, 5px); border: 8px solid green;"/>
-</hbox>
-
-<hbox align="end">
-  <image style="max-height: 22px; list-style-image: url(image4x3.png); -moz-image-region: rect(5px, 25px, 20px, 5px); border: 8px solid green;"/>
-</hbox>
-
 </window>

layout/xul/tree/nsTreeBodyFrame.cpp

@@ -1797,18 +1797,14 @@ nsITheme* nsTreeBodyFrame::GetTwistyRect(int32_t aRowIndex,
 nsresult nsTreeBodyFrame::GetImage(int32_t aRowIndex, nsTreeColumn* aCol,
                                    bool aUseContext,
                                    ComputedStyle* aComputedStyle,
-                                   bool& aAllowImageRegions,
                                    imgIContainer** aResult) {
   *aResult = nullptr;
 
   nsAutoString imageSrc;
   mView->GetImageSrc(aRowIndex, aCol, imageSrc);
   RefPtr<imgRequestProxy> styleRequest;
-  if (!aUseContext && !imageSrc.IsEmpty()) {
-    aAllowImageRegions = false;
-  } else {
+  if (aUseContext || imageSrc.IsEmpty()) {
     // Obtain the URL from the ComputedStyle.
-    aAllowImageRegions = true;
     styleRequest =
         aComputedStyle->StyleList()->mListStyleImage.GetImageRequest();
     if (!styleRequest) return NS_OK;
@@ -1927,24 +1923,13 @@ nsRect nsTreeBodyFrame::GetImageSize(int32_t aRowIndex, nsTreeColumn* aCol,
 
   // We have to load image even though we already have a size.
   // Don't change this, otherwise things start to go awry.
-  bool useImageRegion = true;
   nsCOMPtr<imgIContainer> image;
-  GetImage(aRowIndex, aCol, aUseContext, aComputedStyle, useImageRegion,
-           getter_AddRefs(image));
+  GetImage(aRowIndex, aCol, aUseContext, aComputedStyle, getter_AddRefs(image));
 
   const nsStylePosition* myPosition = aComputedStyle->StylePosition();
-  const nsStyleList* myList = aComputedStyle->StyleList();
-  nsRect imageRegion = myList->GetImageRegion();
-  if (useImageRegion) {
-    r.x += imageRegion.x;
-    r.y += imageRegion.y;
-  }
-
   if (myPosition->mWidth.ConvertsToLength()) {
     int32_t val = myPosition->mWidth.ToLength();
     r.width += val;
-  } else if (useImageRegion && imageRegion.width > 0) {
-    r.width += imageRegion.width;
   } else {
     needWidth = true;
   }
@@ -1952,10 +1937,9 @@ nsRect nsTreeBodyFrame::GetImageSize(int32_t aRowIndex, nsTreeColumn* aCol,
   if (myPosition->mHeight.ConvertsToLength()) {
     int32_t val = myPosition->mHeight.ToLength();
     r.height += val;
-  } else if (useImageRegion && imageRegion.height > 0)
-    r.height += imageRegion.height;
-  else
+  } else {
     needHeight = true;
+  }
 
   if (image) {
     if (needWidth || needHeight) {
@@ -1991,7 +1975,6 @@ nsRect nsTreeBodyFrame::GetImageSize(int32_t aRowIndex, nsTreeColumn* aCol,
 // If only the destination height has been specified in CSS, the width is
 // calculated to maintain the aspect ratio of the image.
 nsSize nsTreeBodyFrame::GetImageDestSize(ComputedStyle* aComputedStyle,
-                                         bool useImageRegion,
                                          imgIContainer* image) {
   nsSize size(0, 0);
 
@@ -2022,24 +2005,10 @@ nsSize nsTreeBodyFrame::GetImageDestSize(ComputedStyle* aComputedStyle,
   if (needWidth || needHeight) {
     // We need to get the size of the image/region.
     nsSize imageSize(0, 0);
-
-    const nsStyleList* myList = aComputedStyle->StyleList();
-    nsRect imageRegion = myList->GetImageRegion();
-    if (useImageRegion && imageRegion.width > 0) {
-      // CSS has specified an image region.
-      // Use the width of the image region.
-      imageSize.width = imageRegion.width;
-    } else if (image) {
+    if (image) {
       nscoord width;
       image->GetWidth(&width);
       imageSize.width = nsPresContext::CSSPixelsToAppUnits(width);
-    }
-
-    if (useImageRegion && imageRegion.height > 0) {
-      // CSS has specified an image region.
-      // Use the height of the image region.
-      imageSize.height = imageRegion.height;
-    } else if (image) {
       nscoord height;
       image->GetHeight(&height);
       imageSize.height = nsPresContext::CSSPixelsToAppUnits(height);
@@ -2079,14 +2048,7 @@ nsSize nsTreeBodyFrame::GetImageDestSize(ComputedStyle* aComputedStyle,
 // The width and height do not reflect the destination size specified
 // in CSS.
 nsRect nsTreeBodyFrame::GetImageSourceRect(ComputedStyle* aComputedStyle,
-                                           bool useImageRegion,
                                            imgIContainer* image) {
-  const nsStyleList* myList = aComputedStyle->StyleList();
-  // CSS has specified an image region.
-  if (useImageRegion && myList->mImageRegion.IsRect()) {
-    return myList->GetImageRegion();
-  }
-
   if (!image) {
     return nsRect();
   }
@@ -3158,9 +3120,7 @@ ImgDrawResult nsTreeBodyFrame::PaintTwisty(
 
       // Get the image for drawing.
       nsCOMPtr<imgIContainer> image;
-      bool useImageRegion = true;
-      GetImage(aRowIndex, aColumn, true, twistyContext, useImageRegion,
-               getter_AddRefs(image));
+      GetImage(aRowIndex, aColumn, true, twistyContext, getter_AddRefs(image));
       if (image) {
         nsPoint anchorPoint = twistyRect.TopLeft();
 
@@ -3210,13 +3170,11 @@ ImgDrawResult nsTreeBodyFrame::PaintImage(
   imageRect.Deflate(imageMargin);
 
   // Get the image.
-  bool useImageRegion = true;
   nsCOMPtr<imgIContainer> image;
-  GetImage(aRowIndex, aColumn, false, imageContext, useImageRegion,
-           getter_AddRefs(image));
+  GetImage(aRowIndex, aColumn, false, imageContext, getter_AddRefs(image));
 
   // Get the image destination size.
-  nsSize imageDestSize = GetImageDestSize(imageContext, useImageRegion, image);
+  nsSize imageDestSize = GetImageDestSize(imageContext, image);
   if (!imageDestSize.width || !imageDestSize.height) {
     return ImgDrawResult::SUCCESS;
   }
@@ -3300,8 +3258,7 @@ ImgDrawResult nsTreeBodyFrame::PaintImage(
       // Get the image source rectangle - the rectangle containing the part of
       // the image that we are going to display.  sourceRect will be passed as
       // the aSrcRect argument in the DrawImage method.
-      nsRect sourceRect =
-          GetImageSourceRect(imageContext, useImageRegion, image);
+      nsRect sourceRect = GetImageSourceRect(imageContext, image);
 
       // Let's say that the image is 100 pixels tall and that the CSS has
       // specified that the destination height should be 50 pixels tall. Let's
@@ -3530,9 +3487,7 @@ ImgDrawResult nsTreeBodyFrame::PaintCheckbox(int32_t aRowIndex,
 
   // Get the image for drawing.
   nsCOMPtr<imgIContainer> image;
-  bool useImageRegion = true;
-  GetImage(aRowIndex, aColumn, true, checkboxContext, useImageRegion,
-           getter_AddRefs(image));
+  GetImage(aRowIndex, aColumn, true, checkboxContext, getter_AddRefs(image));
   if (image) {
     nsPoint pt = checkboxRect.TopLeft();
 

layout/xul/tree/nsTreeBodyFrame.h

@@ -307,8 +307,7 @@ class nsTreeBodyFrame final : public nsLeafBoxFrame,
 
   // Fetch an image from the image cache.
   nsresult GetImage(int32_t aRowIndex, nsTreeColumn* aCol, bool aUseContext,
-                    ComputedStyle* aComputedStyle, bool& aAllowImageRegions,
-                    imgIContainer** aResult);
+                    ComputedStyle* aComputedStyle, imgIContainer** aResult);
 
   // Returns the size of a given image.   This size *includes* border and
   // padding.  It does not include margins.
@@ -317,12 +316,10 @@ class nsTreeBodyFrame final : public nsLeafBoxFrame,
 
   // Returns the destination size of the image, not including borders and
   // padding.
-  nsSize GetImageDestSize(ComputedStyle* aComputedStyle, bool useImageRegion,
-                          imgIContainer* image);
+  nsSize GetImageDestSize(ComputedStyle*, imgIContainer*);
 
   // Returns the source rectangle of the image to be displayed.
-  nsRect GetImageSourceRect(ComputedStyle* aComputedStyle, bool useImageRegion,
-                            imgIContainer* image);
+  nsRect GetImageSourceRect(ComputedStyle*, imgIContainer*);
 
   // Returns the height of rows in the tree.
   int32_t GetRowHeight();

servo/components/style/properties/longhands/list.mako.rs

@@ -73,14 +73,3 @@ ${helpers.predefined_type(
     spec="https://drafts.csswg.org/css-content/#propdef-quotes",
     servo_restyle_damage="rebuild_and_reflow",
 )}
-
-${helpers.predefined_type(
-    "-moz-image-region",
-    "ClipRectOrAuto",
-    "computed::ClipRectOrAuto::auto()",
-    engines="gecko",
-    gecko_ffi_name="mImageRegion",
-    animation_value_type="ComputedValue",
-    boxed=True,
-    spec="Nonstandard (https://developer.mozilla.org/en-US/docs/Web/CSS/-moz-image-region)",
-)}