diff --git a/content/canvas/src/nsCanvasRenderingContext2D.cpp b/content/canvas/src/nsCanvasRenderingContext2D.cpp
index 8e757c48e79..1c69271fc1b 100644
--- a/content/canvas/src/nsCanvasRenderingContext2D.cpp
+++ b/content/canvas/src/nsCanvasRenderingContext2D.cpp
@@ -1792,8 +1792,7 @@ nsCanvasRenderingContext2D::ShadowInitialize(const gfxRect& extents, gfxAlphaBox
     mThebes->SetMatrix(matrix);
     // outset by the blur radius so that blurs can leak onto the canvas even
     // when the shape is outside the clipping area
-    clipExtents.Outset(blurRadius.height, blurRadius.width,
-                       blurRadius.height, blurRadius.width);
+    clipExtents.Inflate(blurRadius.width, blurRadius.height);
     drawExtents = drawExtents.Intersect(clipExtents - CurrentState().shadowOffset);
 
     gfxContext* ctx = blur.Init(drawExtents, gfxIntSize(0,0), blurRadius, nsnull, nsnull);
@@ -2795,7 +2794,7 @@ nsCanvasRenderingContext2D::DrawOrMeasureText(const nsAString& aRawText,
 
     if (doDrawShadow) {
         // for some reason the box is too tight, probably rounding error
-        processor.mBoundingBox.Outset(2.0);
+        processor.mBoundingBox.Inflate(2.0);
 
         // this is unnecessarily big is max-width scaling is involved, but it
         // will still produce correct output
diff --git a/gfx/src/BaseRect.h b/gfx/src/BaseRect.h
index 42516878732..09f9cdc9b4c 100644
--- a/gfx/src/BaseRect.h
+++ b/gfx/src/BaseRect.h
@@ -201,6 +201,7 @@ struct BaseRect {
   void SizeTo(T aWidth, T aHeight) { width = aWidth; height = aHeight; }
   void SizeTo(const SizeT& aSize) { width = aSize.width; height = aSize.height; }
 
+  void Inflate(T aD) { Inflate(aD, aD); }
   void Inflate(T aDx, T aDy)
   {
     x -= aDx;
@@ -215,7 +216,9 @@ struct BaseRect {
     width += aMargin.LeftRight();
     height += aMargin.TopBottom();
   }
+  void Inflate(const SizeT& aSize) { Inflate(aSize.width, aSize.height); }
 
+  void Deflate(T aD) { Deflate(aD, aD); }
   void Deflate(T aDx, T aDy)
   {
     x += aDx;
@@ -230,6 +233,7 @@ struct BaseRect {
     width = NS_MAX(T(0), width - aMargin.LeftRight());
     height = NS_MAX(T(0), height - aMargin.TopBottom());
   }
+  void Deflate(const SizeT& aSize) { Deflate(aSize.width, aSize.height); }
 
   // Return true if the rectangles contain the same set of points, including
   // points on the edges.
diff --git a/gfx/thebes/gfxBlur.cpp b/gfx/thebes/gfxBlur.cpp
index 952fd1e6e1e..613c6957e3e 100644
--- a/gfx/thebes/gfxBlur.cpp
+++ b/gfx/thebes/gfxBlur.cpp
@@ -63,7 +63,7 @@ gfxAlphaBoxBlur::Init(const gfxRect& aRect,
     mBlurRadius = aBlurRadius;
 
     gfxRect rect(aRect);
-    rect.Outset(aBlurRadius + aSpreadRadius);
+    rect.Inflate(aBlurRadius + aSpreadRadius);
     rect.RoundOut();
 
     if (aDirtyRect) {
@@ -72,7 +72,7 @@ gfxAlphaBoxBlur::Init(const gfxRect& aRect,
         mHasDirtyRect = PR_TRUE;
         mDirtyRect = *aDirtyRect;
         gfxRect requiredBlurArea = mDirtyRect.Intersect(rect);
-        requiredBlurArea.Outset(aBlurRadius + aSpreadRadius);
+        requiredBlurArea.Inflate(aBlurRadius + aSpreadRadius);
         rect = requiredBlurArea.Intersect(rect);
     } else {
         mHasDirtyRect = PR_FALSE;
@@ -90,7 +90,7 @@ gfxAlphaBoxBlur::Init(const gfxRect& aRect,
         // expensive int<->float conversions if we were to use gfxRect instead.
         gfxRect skipRect = *aSkipRect;
         skipRect.RoundIn();
-        skipRect.Inset(aBlurRadius + aSpreadRadius);
+        skipRect.Deflate(aBlurRadius + aSpreadRadius);
         gfxUtils::GfxRectToIntRect(skipRect, &mSkipRect);
         nsIntRect shadowIntRect;
         gfxUtils::GfxRectToIntRect(rect, &shadowIntRect);
diff --git a/gfx/thebes/gfxRect.h b/gfx/thebes/gfxRect.h
index a7b5e9f39aa..ed376e41a39 100644
--- a/gfx/thebes/gfxRect.h
+++ b/gfx/thebes/gfxRect.h
@@ -44,6 +44,7 @@
 #include "nsDebug.h"
 #include "mozilla/BaseMargin.h"
 #include "mozilla/BaseRect.h"
+#include "nsRect.h"
 
 struct gfxMargin : public mozilla::BaseMargin<gfxFloat, gfxMargin> {
   typedef mozilla::BaseMargin<gfxFloat, gfxMargin> Super;
@@ -94,6 +95,8 @@ struct THEBES_API gfxRect :
         Super(aPos, aSize) {}
     gfxRect(gfxFloat aX, gfxFloat aY, gfxFloat aWidth, gfxFloat aHeight) :
         Super(aX, aY, aWidth, aHeight) {}
+    gfxRect(const nsIntRect& aRect) :
+        Super(aRect.x, aRect.y, aRect.width, aRect.height) {}
 
     /**
      * Return true if all components of this rect are within
@@ -103,34 +106,6 @@ struct THEBES_API gfxRect :
      */
     PRBool WithinEpsilonOfIntegerPixels(gfxFloat aEpsilon) const;
 
-    void Inset(gfxFloat k) {
-        Deflate(k, k);
-    }
-
-    void Inset(gfxFloat top, gfxFloat right, gfxFloat bottom, gfxFloat left) {
-        Deflate(gfxMargin(left, top, right, bottom));
-    }
-
-    void Inset(const gfxFloat *sides) {
-        Inset(sides[0], sides[1], sides[2], sides[3]);
-    }
-
-    void Inset(const gfxIntSize& aSize) {
-        Deflate(aSize.width, aSize.height);
-    }
-
-    void Outset(gfxFloat k) {
-        Inflate(k, k);
-    }
-
-    void Outset(gfxFloat top, gfxFloat right, gfxFloat bottom, gfxFloat left) {
-        Inflate(gfxMargin(left, top, right, bottom));
-    }
-
-    void Outset(const gfxIntSize& aSize) {
-        Outset(aSize.height, aSize.width, aSize.height, aSize.width);
-    }
-
     // Round the rectangle edges to integer coordinates, such that the rounded
     // rectangle has the same set of pixel centers as the original rectangle.
     // Edges at offset 0.5 round up.
diff --git a/gfx/thebes/gfxUtils.cpp b/gfx/thebes/gfxUtils.cpp
index 2daf7e49ef8..74e5b27e97c 100644
--- a/gfx/thebes/gfxUtils.cpp
+++ b/gfx/thebes/gfxUtils.cpp
@@ -251,7 +251,7 @@ CreateSamplingRestrictedDrawable(gfxDrawable* aDrawable,
         aUserSpaceToImageSpace.TransformBounds(userSpaceClipExtents);
     // Inflate by one pixel because bilinear filtering will sample at most
     // one pixel beyond the computed image pixel coordinate.
-    imageSpaceClipExtents.Outset(1.0);
+    imageSpaceClipExtents.Inflate(1.0);
 
     gfxRect needed = imageSpaceClipExtents.Intersect(aSourceRect);
     needed = needed.Intersect(aSubimage);
diff --git a/gfx/thebes/gfxXlibNativeRenderer.cpp b/gfx/thebes/gfxXlibNativeRenderer.cpp
index b7dfcbab5de..d6bc3230b08 100644
--- a/gfx/thebes/gfxXlibNativeRenderer.cpp
+++ b/gfx/thebes/gfxXlibNativeRenderer.cpp
@@ -502,7 +502,7 @@ gfxXlibNativeRenderer::Draw(gfxContext* ctx, nsIntSize size,
     if (!matrixIsIntegerTranslation) {
         // The filter footprint means that the affected rectangle is a
         // little larger than the drawingRect;
-        affectedRect.Outset(filterRadius);
+        affectedRect.Inflate(filterRadius);
 
         NATIVE_DRAWING_NOTE("FALLBACK: matrix not integer translation");
     } else if (!canDrawOverBackground) {
@@ -531,7 +531,7 @@ gfxXlibNativeRenderer::Draw(gfxContext* ctx, nsIntSize size,
     if (!matrixIsIntegerTranslation) {
         // The source surface may need to be a little larger than the clip
         // extents due to the filter footprint.
-        clipExtents.Outset(filterRadius);
+        clipExtents.Inflate(filterRadius);
     }
     clipExtents.RoundOut();
 
diff --git a/layout/base/nsCSSRendering.cpp b/layout/base/nsCSSRendering.cpp
index 621b4060b89..1329ba78d9b 100644
--- a/layout/base/nsCSSRendering.cpp
+++ b/layout/base/nsCSSRendering.cpp
@@ -1127,9 +1127,9 @@ nsCSSRendering::PaintBoxShadowOuter(nsPresContext* aPresContext,
       aForFrame->GetPaddingRect() - aForFrame->GetPosition() + aFrameArea.TopLeft();
     skipGfxRect = nsLayoutUtils::RectToGfxRect(paddingRect, twipsPerPixel);
   } else if (hasBorderRadius) {
-    skipGfxRect.Inset(
-        PR_MAX(borderRadii[C_TL].height, borderRadii[C_TR].height), 0,
-        PR_MAX(borderRadii[C_BL].height, borderRadii[C_BR].height), 0);
+    skipGfxRect.Deflate(gfxMargin(
+        0, PR_MAX(borderRadii[C_TL].height, borderRadii[C_TR].height),
+        0, PR_MAX(borderRadii[C_BL].height, borderRadii[C_BR].height)));
   }
 
   for (PRUint32 i = shadows->Length(); i > 0; --i) {
@@ -1366,8 +1366,9 @@ nsCSSRendering::PaintBoxShadowInner(nsPresContext* aPresContext,
     skipRect.Deflate(blurMargin);
     gfxRect skipGfxRect = nsLayoutUtils::RectToGfxRect(skipRect, twipsPerPixel);
     if (hasBorderRadius) {
-      skipGfxRect.Inset(PR_MAX(clipRectRadii[C_TL].height, clipRectRadii[C_TR].height), 0,
-                        PR_MAX(clipRectRadii[C_BL].height, clipRectRadii[C_BR].height), 0);
+      skipGfxRect.Deflate(
+          gfxMargin(0, PR_MAX(clipRectRadii[C_TL].height, clipRectRadii[C_TR].height),
+                    0, PR_MAX(clipRectRadii[C_BL].height, clipRectRadii[C_BR].height)));
     }
 
     // When there's a blur radius, gfxAlphaBoxBlur leaves the skiprect area
diff --git a/layout/base/nsCSSRenderingBorders.cpp b/layout/base/nsCSSRenderingBorders.cpp
index f16c7295ccf..d9581913abf 100644
--- a/layout/base/nsCSSRenderingBorders.cpp
+++ b/layout/base/nsCSSRenderingBorders.cpp
@@ -188,10 +188,11 @@ nsCSSBorderRenderer::nsCSSBorderRenderer(PRInt32 aAppUnitsPerPixel,
   }
 
   mInnerRect = mOuterRect;
-  mInnerRect.Inset(mBorderStyles[0] != NS_STYLE_BORDER_STYLE_NONE ? mBorderWidths[0] : 0,
-                   mBorderStyles[1] != NS_STYLE_BORDER_STYLE_NONE ? mBorderWidths[1] : 0,
-                   mBorderStyles[2] != NS_STYLE_BORDER_STYLE_NONE ? mBorderWidths[2] : 0,
-                   mBorderStyles[3] != NS_STYLE_BORDER_STYLE_NONE ? mBorderWidths[3] : 0);
+  mInnerRect.Deflate(
+      gfxMargin(mBorderStyles[3] != NS_STYLE_BORDER_STYLE_NONE ? mBorderWidths[3] : 0,
+                mBorderStyles[0] != NS_STYLE_BORDER_STYLE_NONE ? mBorderWidths[0] : 0,
+                mBorderStyles[1] != NS_STYLE_BORDER_STYLE_NONE ? mBorderWidths[1] : 0,
+                mBorderStyles[2] != NS_STYLE_BORDER_STYLE_NONE ? mBorderWidths[2] : 0));
 
   ComputeBorderCornerDimensions(mOuterRect, mInnerRect, mBorderRadii, &mBorderCornerDimensions);
 
@@ -563,7 +564,7 @@ nsCSSBorderRenderer::FillSolidBorder(const gfxRect& aOuterRect,
       CheckFourFloatsEqual(aBorderSizes, aBorderSizes[0]))
   {
     gfxRect r(aOuterRect);
-    r.Inset(aBorderSizes[0] / 2.0);
+    r.Deflate(aBorderSizes[0] / 2.0);
     mContext->SetLineWidth(aBorderSizes[0]);
 
     mContext->NewPath();
@@ -707,7 +708,7 @@ nsCSSBorderRenderer::DrawBorderSidesCompositeColors(PRIntn aSides, const nsBorde
     gfxRGBA lineColor = ComputeCompositeColorForLine(i, aCompositeColors);
 
     gfxRect siRect = soRect;
-    siRect.Inset(1.0, 1.0, 1.0, 1.0);
+    siRect.Deflate(1.0);
 
     // now cap the rects to the real mInnerRect
     gfxPoint tl = siRect.TopLeft();
@@ -904,7 +905,8 @@ nsCSSBorderRenderer::DrawBorderSides(PRIntn aSides)
   for (unsigned int i = 0; i < borderColorStyleCount; i++) {
     // walk siRect inwards at the start of the loop to get the
     // correct inner rect.
-    siRect.Inset(borderWidths[i]);
+    siRect.Deflate(gfxMargin(borderWidths[i][3], borderWidths[i][0],
+                             borderWidths[i][1], borderWidths[i][2]));
 
     if (borderColorStyle[i] != BorderColorStyleNone) {
       gfxRGBA color = ComputeColorForLine(i,
@@ -1113,7 +1115,7 @@ nsCSSBorderRenderer::DrawSingleWidthSolidBorder()
   // Easy enough to deal with.
   mContext->SetLineWidth(1);
   gfxRect rect = mOuterRect;
-  rect.Inset(0.5);
+  rect.Deflate(0.5);
 
   const twoFloats cornerAdjusts[4] = { { +0.5,  0   },
                                        {    0, +0.5 },
@@ -1158,8 +1160,8 @@ nsCSSBorderRenderer::DrawNoCompositeColorSolidBorder()
   ComputeInnerRadii(mBorderRadii, mBorderWidths, &innerRadii);
 
   gfxRect strokeRect = mOuterRect;
-  strokeRect.Inset(mBorderWidths[0] / 2.0, mBorderWidths[1] / 2.0,
-                    mBorderWidths[2] / 2.0, mBorderWidths[3] / 2.0);
+  strokeRect.Deflate(gfxMargin(mBorderWidths[3] / 2.0, mBorderWidths[0] / 2.0,
+                               mBorderWidths[1] / 2.0, mBorderWidths[2] / 2.0));
 
   NS_FOR_CSS_CORNERS(i) {
       // the corner index -- either 1 2 3 0 (cw) or 0 3 2 1 (ccw)
@@ -1292,7 +1294,7 @@ nsCSSBorderRenderer::DrawRectangularCompositeColors()
   mContext->SetLineWidth(1);
   memcpy(currentColors, mCompositeColors, sizeof(nsBorderColors*) * 4);
   gfxRect rect = mOuterRect;
-  rect.Inset(0.5);
+  rect.Deflate(0.5);
 
   const twoFloats cornerAdjusts[4] = { { +0.5,  0   },
                                         {    0, +0.5 },
@@ -1347,7 +1349,7 @@ nsCSSBorderRenderer::DrawRectangularCompositeColors()
     if (currentColors[0] && currentColors[0]->mNext) {
       currentColors[0] = currentColors[0]->mNext;
     }
-    rect.Inset(1);
+    rect.Deflate(1);
   }
 }
 
@@ -1419,7 +1421,7 @@ nsCSSBorderRenderer::DrawBorders()
     // Very simple case.
     SetupStrokeStyle(NS_SIDE_TOP);
     gfxRect rect = mOuterRect;
-    rect.Inset(mBorderWidths[0] / 2.0);
+    rect.Deflate(mBorderWidths[0] / 2.0);
     mContext->NewPath();
     mContext->Rectangle(rect);
     mContext->Stroke();
@@ -1441,7 +1443,7 @@ nsCSSBorderRenderer::DrawBorders()
     mContext->SetDash(&dash, 1, 0.5);
     mContext->SetAntialiasMode(gfxContext::MODE_ALIASED);
     gfxRect rect = mOuterRect;
-    rect.Inset(mBorderWidths[0] / 2.0);
+    rect.Deflate(mBorderWidths[0] / 2.0);
     mContext->NewPath();
     mContext->Rectangle(rect);
     mContext->Stroke();
@@ -1469,7 +1471,7 @@ nsCSSBorderRenderer::DrawBorders()
     if (noCornerOutsideCenter) {
       // Relatively simple case.
       SetupStrokeStyle(NS_SIDE_TOP);
-      mOuterRect.Inset(mBorderWidths[0] / 2.0);
+      mOuterRect.Deflate(mBorderWidths[0] / 2.0);
       NS_FOR_CSS_CORNERS(corner) {
         if (mBorderRadii.sizes[corner].height == 0 || mBorderRadii.sizes[corner].width == 0) {
           continue;
diff --git a/layout/mathml/nsMathMLmencloseFrame.cpp b/layout/mathml/nsMathMLmencloseFrame.cpp
index 23ff471dcc5..4b8d4e9ebf0 100644
--- a/layout/mathml/nsMathMLmencloseFrame.cpp
+++ b/layout/mathml/nsMathMLmencloseFrame.cpp
@@ -777,7 +777,7 @@ void nsDisplayNotation::Paint(nsDisplayListBuilder* aBuilder,
   gfxFloat e = presContext->AppUnitsToGfxUnits(mThickness);
   gfxCtx->SetLineWidth(e);
 
-  rect.Inset(e / 2.0);
+  rect.Deflate(e / 2.0);
 
   gfxCtx->NewPath();
 
diff --git a/layout/svg/base/src/nsSVGUtils.cpp b/layout/svg/base/src/nsSVGUtils.cpp
index 2eeab42b2be..c0344788219 100644
--- a/layout/svg/base/src/nsSVGUtils.cpp
+++ b/layout/svg/base/src/nsSVGUtils.cpp
@@ -1438,7 +1438,7 @@ nsSVGUtils::PathExtentsToMaxStrokeExtents(const gfxRect& aPathExtents,
   double dy = style_expansion * (fabs(ctm.yy) + fabs(ctm.yx));
 
   gfxRect strokeExtents = aPathExtents;
-  strokeExtents.Outset(dy, dx, dy, dx);
+  strokeExtents.Inflate(dx, dy);
   return strokeExtents;
 }