diff -r 000000000000 -r 6474c204b198 gfx/thebes/gfxBlur.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/thebes/gfxBlur.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,180 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "gfxBlur.h"
+#include "gfxContext.h"
+#include "gfxImageSurface.h"
+#include "gfxPlatform.h"
+
+#include "mozilla/gfx/Blur.h"
+#include "mozilla/gfx/2D.h"
+
+using namespace mozilla::gfx;
+
+gfxAlphaBoxBlur::gfxAlphaBoxBlur()
+ : mBlur(nullptr)
+{
+}
+
+gfxAlphaBoxBlur::~gfxAlphaBoxBlur()
+{
+  mContext = nullptr;
+  delete mBlur;
+}
+
+gfxContext*
+gfxAlphaBoxBlur::Init(const gfxRect& aRect,
+                      const gfxIntSize& aSpreadRadius,
+                      const gfxIntSize& aBlurRadius,
+                      const gfxRect* aDirtyRect,
+                      const gfxRect* aSkipRect)
+{
+    mozilla::gfx::Rect rect(Float(aRect.x), Float(aRect.y),
+                            Float(aRect.width), Float(aRect.height));
+    IntSize spreadRadius(aSpreadRadius.width, aSpreadRadius.height);
+    IntSize blurRadius(aBlurRadius.width, aBlurRadius.height);
+    nsAutoPtr<mozilla::gfx::Rect> dirtyRect;
+    if (aDirtyRect) {
+      dirtyRect = new mozilla::gfx::Rect(Float(aDirtyRect->x),
+                                         Float(aDirtyRect->y),
+                                         Float(aDirtyRect->width),
+                                         Float(aDirtyRect->height));
+    }
+    nsAutoPtr<mozilla::gfx::Rect> skipRect;
+    if (aSkipRect) {
+      skipRect = new mozilla::gfx::Rect(Float(aSkipRect->x),
+                                        Float(aSkipRect->y),
+                                        Float(aSkipRect->width),
+                                        Float(aSkipRect->height));
+    }
+
+    mBlur = new AlphaBoxBlur(rect, spreadRadius, blurRadius, dirtyRect, skipRect);
+    size_t blurDataSize = mBlur->GetSurfaceAllocationSize();
+    if (blurDataSize == 0)
+        return nullptr;
+
+    IntSize size = mBlur->GetSize();
+
+    // Make an alpha-only surface to draw on. We will play with the data after
+    // everything is drawn to create a blur effect.
+    mData = new (std::nothrow) unsigned char[blurDataSize];
+    if (!mData) {
+        return nullptr;
+    }
+    memset(mData, 0, blurDataSize);
+
+    mozilla::RefPtr<DrawTarget> dt =
+        gfxPlatform::GetPlatform()->CreateDrawTargetForData(mData, size,
+                                                            mBlur->GetStride(),
+                                                            SurfaceFormat::A8);
+    if (!dt) {
+        nsRefPtr<gfxImageSurface> image =
+            new gfxImageSurface(mData,
+                                gfxIntSize(size.width, size.height),
+                                mBlur->GetStride(),
+                                gfxImageFormat::A8);
+        dt = Factory::CreateDrawTargetForCairoSurface(image->CairoSurface(), size);
+        if (!dt) {
+            return nullptr;
+        }
+    }
+
+    IntRect irect = mBlur->GetRect();
+    gfxPoint topleft(irect.TopLeft().x, irect.TopLeft().y);
+
+    mContext = new gfxContext(dt);
+    mContext->Translate(-topleft);
+
+    return mContext;
+}
+
+void
+gfxAlphaBoxBlur::Paint(gfxContext* aDestinationCtx)
+{
+    if (!mContext)
+        return;
+
+    mBlur->Blur(mData);
+
+    mozilla::gfx::Rect* dirtyRect = mBlur->GetDirtyRect();
+
+    DrawTarget *dest = aDestinationCtx->GetDrawTarget();
+    if (!dest) {
+      NS_WARNING("Blurring not supported for Thebes contexts!");
+      return;
+    }
+
+    mozilla::RefPtr<SourceSurface> mask
+      = dest->CreateSourceSurfaceFromData(mData,
+                                          mBlur->GetSize(),
+                                          mBlur->GetStride(),
+                                          SurfaceFormat::A8);
+    if (!mask) {
+      NS_ERROR("Failed to create mask!");
+      return;
+    }
+
+    nsRefPtr<gfxPattern> thebesPat = aDestinationCtx->GetPattern();
+    Pattern* pat = thebesPat->GetPattern(dest, nullptr);
+
+    Matrix oldTransform = dest->GetTransform();
+    Matrix newTransform = oldTransform;
+    newTransform.Translate(mBlur->GetRect().x, mBlur->GetRect().y);
+
+    // Avoid a semi-expensive clip operation if we can, otherwise
+    // clip to the dirty rect
+    if (dirtyRect) {
+        dest->PushClipRect(*dirtyRect);
+    }
+
+    dest->SetTransform(newTransform);
+    dest->MaskSurface(*pat, mask, Point(0, 0));
+    dest->SetTransform(oldTransform);
+
+    if (dirtyRect) {
+        dest->PopClip();
+    }
+}
+
+gfxIntSize gfxAlphaBoxBlur::CalculateBlurRadius(const gfxPoint& aStd)
+{
+    mozilla::gfx::Point std(Float(aStd.x), Float(aStd.y));
+    IntSize size = AlphaBoxBlur::CalculateBlurRadius(std);
+    return gfxIntSize(size.width, size.height);
+}
+
+/* static */ void
+gfxAlphaBoxBlur::BlurRectangle(gfxContext *aDestinationCtx,
+                               const gfxRect& aRect,
+                               gfxCornerSizes* aCornerRadii,
+                               const gfxPoint& aBlurStdDev,
+                               const gfxRGBA& aShadowColor,
+                               const gfxRect& aDirtyRect,
+                               const gfxRect& aSkipRect)
+{
+  gfxIntSize blurRadius = CalculateBlurRadius(aBlurStdDev);
+
+  // Create the temporary surface for blurring
+  gfxAlphaBoxBlur blur;
+  gfxContext *dest = blur.Init(aRect, gfxIntSize(), blurRadius, &aDirtyRect, &aSkipRect);
+
+  if (!dest) {
+    return;
+  }
+
+  gfxRect shadowGfxRect = aRect;
+  shadowGfxRect.Round();
+
+  dest->NewPath();
+  if (aCornerRadii) {
+    dest->RoundedRectangle(shadowGfxRect, *aCornerRadii);
+  } else {
+    dest->Rectangle(shadowGfxRect);
+  }
+  dest->Fill();
+
+  aDestinationCtx->SetColor(aShadowColor);
+  blur.Paint(aDestinationCtx);
+}