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diff --git a/gfx/thebes/gfxContext.h b/gfx/thebes/gfxContext.h
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+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * 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/. */
+
+#ifndef GFX_CONTEXT_H
+#define GFX_CONTEXT_H
+
+#include "gfxTypes.h"
+
+#include "gfxASurface.h"
+#include "gfxPoint.h"
+#include "gfxRect.h"
+#include "gfxMatrix.h"
+#include "gfxPattern.h"
+#include "nsTArray.h"
+
+#include "mozilla/gfx/2D.h"
+
+typedef struct _cairo cairo_t;
+class GlyphBufferAzure;
+
+namespace mozilla {
+namespace gfx {
+struct RectCornerRadii;
+}  // namespace gfx
+namespace layout {
+class TextDrawTarget;
+}  // namespace layout
+}  // namespace mozilla
+
+class ClipExporter;
+
+/**
+ * This is the main class for doing actual drawing. It is initialized using
+ * a surface and can be drawn on. It manages various state information like
+ * a current transformation matrix (CTM), a current path, current color,
+ * etc.
+ *
+ * All drawing happens by creating a path and then stroking or filling it.
+ * The functions like Rectangle and Arc do not do any drawing themselves.
+ * When a path is drawn (stroked or filled), it is filled/stroked with a
+ * pattern set by SetPattern or SetColor.
+ *
+ * Note that the gfxContext takes coordinates in device pixels,
+ * as opposed to app units.
+ */
+class gfxContext final {
+  typedef mozilla::gfx::CapStyle CapStyle;
+  typedef mozilla::gfx::CompositionOp CompositionOp;
+  typedef mozilla::gfx::JoinStyle JoinStyle;
+  typedef mozilla::gfx::FillRule FillRule;
+  typedef mozilla::gfx::Float Float;
+  typedef mozilla::gfx::Path Path;
+  typedef mozilla::gfx::Pattern Pattern;
+  typedef mozilla::gfx::Rect Rect;
+  typedef mozilla::gfx::RectCornerRadii RectCornerRadii;
+  typedef mozilla::gfx::Size Size;
+
+  NS_INLINE_DECL_REFCOUNTING(gfxContext)
+
+ public:
+  /**
+   * Initialize this context from a DrawTarget.
+   * Strips any transform from aTarget.
+   * aTarget will be flushed in the gfxContext's destructor.
+   * If aTarget is null or invalid, nullptr is returned.  The caller
+   * is responsible for handling this scenario as appropriate.
+   */
+  static already_AddRefed<gfxContext> CreateOrNull(
+      mozilla::gfx::DrawTarget* aTarget,
+      const mozilla::gfx::Point& aDeviceOffset = mozilla::gfx::Point());
+
+  /**
+   * Create a new gfxContext wrapping aTarget and preserving aTarget's
+   * transform. Note that the transform is moved from aTarget to the resulting
+   * gfxContext, aTarget will no longer have its transform.
+   * If aTarget is null or invalid, nullptr is returned.  The caller
+   * is responsible for handling this scenario as appropriate.
+   */
+  static already_AddRefed<gfxContext> CreatePreservingTransformOrNull(
+      mozilla::gfx::DrawTarget* aTarget);
+
+  mozilla::gfx::DrawTarget* GetDrawTarget() { return mDT; }
+
+  /**
+   * Returns the DrawTarget if it's actually a TextDrawTarget.
+   */
+  mozilla::layout::TextDrawTarget* GetTextDrawer();
+
+  /**
+   ** State
+   **/
+  // XXX document exactly what bits are saved
+  void Save();
+  void Restore();
+
+  /**
+   ** Paths & Drawing
+   **/
+
+  /**
+   * Fill the current path according to the current settings.
+   *
+   * Does not consume the current path.
+   */
+  void Fill();
+  void Fill(const Pattern& aPattern);
+
+  /**
+   * Forgets the current path.
+   */
+  void NewPath();
+
+  /**
+   * Closes the path, i.e. connects the last drawn point to the first one.
+   *
+   * Filling a path will implicitly close it.
+   */
+  void ClosePath();
+
+  /**
+   * Returns the current path.
+   */
+  already_AddRefed<Path> GetPath();
+
+  /**
+   * Sets the given path as the current path.
+   */
+  void SetPath(Path* path);
+
+  /**
+   * Moves the pen to a new point without drawing a line.
+   */
+  void MoveTo(const gfxPoint& pt);
+
+  /**
+   * Draws a line from the current point to pt.
+   *
+   * @see MoveTo
+   */
+  void LineTo(const gfxPoint& pt);
+
+  // path helpers
+  /**
+   * Draws a line from start to end.
+   */
+  void Line(const gfxPoint& start,
+            const gfxPoint& end);  // XXX snapToPixels option?
+
+  /**
+   * Draws the rectangle given by rect.
+   */
+  void Rectangle(const gfxRect& rect) { return Rectangle(rect, false); }
+  void SnappedRectangle(const gfxRect& rect) { return Rectangle(rect, true); }
+
+ private:
+  void Rectangle(const gfxRect& rect, bool snapToPixels);
+
+ public:
+  /**
+   ** Transformation Matrix manipulation
+   **/
+
+  /**
+   * Post-multiplies 'other' onto the current CTM, i.e. this
+   * matrix's transformation will take place before the previously set
+   * transformations.
+   */
+  void Multiply(const gfxMatrix& other);
+  void Multiply(const mozilla::gfx::Matrix& other);
+
+  /**
+   * Replaces the current transformation matrix with matrix.
+   */
+  void SetMatrix(const mozilla::gfx::Matrix& matrix);
+  void SetMatrixDouble(const gfxMatrix& matrix);
+
+  /**
+   * Returns the current transformation matrix.
+   */
+  mozilla::gfx::Matrix CurrentMatrix() const;
+  gfxMatrix CurrentMatrixDouble() const;
+
+  /**
+   * Converts a point from device to user coordinates using the inverse
+   * transformation matrix.
+   */
+  gfxPoint DeviceToUser(const gfxPoint& point) const;
+
+  /**
+   * Converts a size from device to user coordinates. This does not apply
+   * translation components of the matrix.
+   */
+  Size DeviceToUser(const Size& size) const;
+
+  /**
+   * Converts a rectangle from device to user coordinates; this has the
+   * same effect as using DeviceToUser on both the rectangle's point and
+   * size.
+   */
+  gfxRect DeviceToUser(const gfxRect& rect) const;
+
+  /**
+   * Converts a point from user to device coordinates using the transformation
+   * matrix.
+   */
+  gfxPoint UserToDevice(const gfxPoint& point) const;
+
+  /**
+   * Converts a size from user to device coordinates. This does not apply
+   * translation components of the matrix.
+   */
+  Size UserToDevice(const Size& size) const;
+
+  /**
+   * Converts a rectangle from user to device coordinates.  The
+   * resulting rectangle is the minimum device-space rectangle that
+   * encloses the user-space rectangle given.
+   */
+  gfxRect UserToDevice(const gfxRect& rect) const;
+
+  /**
+   * Takes the given rect and tries to align it to device pixels.  If
+   * this succeeds, the method will return true, and the rect will
+   * be in device coordinates (already transformed by the CTM).  If it
+   * fails, the method will return false, and the rect will not be
+   * changed.
+   *
+   * If ignoreScale is true, then snapping will take place even if
+   * the CTM has a scale applied.  Snapping never takes place if
+   * there is a rotation in the CTM.
+   */
+  bool UserToDevicePixelSnapped(gfxRect& rect, bool ignoreScale = false) const;
+
+  /**
+   * Takes the given point and tries to align it to device pixels.  If
+   * this succeeds, the method will return true, and the point will
+   * be in device coordinates (already transformed by the CTM).  If it
+   * fails, the method will return false, and the point will not be
+   * changed.
+   *
+   * If ignoreScale is true, then snapping will take place even if
+   * the CTM has a scale applied.  Snapping never takes place if
+   * there is a rotation in the CTM.
+   */
+  bool UserToDevicePixelSnapped(gfxPoint& pt, bool ignoreScale = false) const;
+
+  /**
+   ** Painting sources
+   **/
+
+  /**
+   * Set a solid color to use for drawing.  This color is in the device color
+   * space and is not transformed.
+   */
+  void SetDeviceColor(const mozilla::gfx::DeviceColor& aColor);
+
+  /**
+   * Gets the current color.  It's returned in the device color space.
+   * returns false if there is something other than a color
+   *         set as the current source (pattern, surface, etc)
+   */
+  bool GetDeviceColor(mozilla::gfx::DeviceColor& aColorOut);
+
+  /**
+   * Returns true if color is neither opaque nor transparent (i.e. alpha is not
+   * 0 or 1), and false otherwise. If true, aColorOut is set on output.
+   */
+  bool HasNonOpaqueNonTransparentColor(mozilla::gfx::DeviceColor& aColorOut) {
+    return GetDeviceColor(aColorOut) && 0.f < aColorOut.a && aColorOut.a < 1.f;
+  }
+
+  /**
+   * Set a solid color in the sRGB color space to use for drawing.
+   * If CMS is not enabled, the color is treated as a device-space color
+   * and this call is identical to SetDeviceColor().
+   */
+  void SetColor(const mozilla::gfx::sRGBColor& aColor);
+
+  /**
+   * Uses a pattern for drawing.
+   */
+  void SetPattern(gfxPattern* pattern);
+
+  /**
+   * Get the source pattern (solid color, normal pattern, surface, etc)
+   */
+  already_AddRefed<gfxPattern> GetPattern();
+
+  /**
+   ** Painting
+   **/
+  /**
+   * Paints the current source surface/pattern everywhere in the current
+   * clip region.
+   */
+  void Paint(Float alpha = 1.0);
+
+  /**
+   ** Painting with a Mask
+   **/
+  /**
+   * Like Paint, except that it only draws the source where pattern is
+   * non-transparent.
+   */
+  void Mask(mozilla::gfx::SourceSurface* aSurface, mozilla::gfx::Float aAlpha,
+            const mozilla::gfx::Matrix& aTransform);
+  void Mask(mozilla::gfx::SourceSurface* aSurface,
+            const mozilla::gfx::Matrix& aTransform) {
+    Mask(aSurface, 1.0f, aTransform);
+  }
+  void Mask(mozilla::gfx::SourceSurface* surface, float alpha = 1.0f,
+            const mozilla::gfx::Point& offset = mozilla::gfx::Point());
+
+  /**
+   ** Line Properties
+   **/
+
+  void SetDash(const Float* dashes, int ndash, Float offset);
+  // Return true if dashing is set, false if it's not enabled or the
+  // context is in an error state.  |offset| can be nullptr to mean
+  // "don't care".
+  bool CurrentDash(FallibleTArray<Float>& dashes, Float* offset) const;
+
+  /**
+   * Sets the line width that's used for line drawing.
+   */
+  void SetLineWidth(Float width);
+
+  /**
+   * Returns the currently set line width.
+   *
+   * @see SetLineWidth
+   */
+  Float CurrentLineWidth() const;
+
+  /**
+   * Sets the line caps, i.e. how line endings are drawn.
+   */
+  void SetLineCap(CapStyle cap);
+  CapStyle CurrentLineCap() const;
+
+  /**
+   * Sets the line join, i.e. how the connection between two lines is
+   * drawn.
+   */
+  void SetLineJoin(JoinStyle join);
+  JoinStyle CurrentLineJoin() const;
+
+  void SetMiterLimit(Float limit);
+  Float CurrentMiterLimit() const;
+
+  /**
+   * Sets the operator used for all further drawing. The operator affects
+   * how drawing something will modify the destination. For example, the
+   * OVER operator will do alpha blending of source and destination, while
+   * SOURCE will replace the destination with the source.
+   */
+  void SetOp(CompositionOp op);
+  CompositionOp CurrentOp() const;
+
+  void SetAntialiasMode(mozilla::gfx::AntialiasMode mode);
+  mozilla::gfx::AntialiasMode CurrentAntialiasMode() const;
+
+  /**
+   ** Clipping
+   **/
+
+  /**
+   * Clips all further drawing to the current path.
+   * This does not consume the current path.
+   */
+  void Clip();
+
+  /**
+   * Helper functions that will create a rect path and call Clip().
+   * Any current path will be destroyed by these functions!
+   */
+  void Clip(const Rect& rect);
+  void Clip(const gfxRect& rect);         // will clip to a rect
+  void SnappedClip(const gfxRect& rect);  // snap rect and clip to the result
+  void Clip(Path* aPath);
+
+  void PopClip();
+
+  enum ClipExtentsSpace {
+    eUserSpace = 0,
+    eDeviceSpace = 1,
+  };
+
+  /**
+   * According to aSpace, this function will return the current bounds of
+   * the clip region in user space or device space.
+   */
+  gfxRect GetClipExtents(ClipExtentsSpace aSpace = eUserSpace) const;
+
+  /**
+   * Returns true if the given rectangle is fully contained in the current clip.
+   * This is conservative; it may return false even when the given rectangle is
+   * fully contained by the current clip.
+   */
+  bool ClipContainsRect(const gfxRect& aRect);
+
+  /**
+   * Exports the current clip using the provided exporter.
+   */
+  bool ExportClip(ClipExporter& aExporter);
+
+  /**
+   * Groups
+   */
+  void PushGroupForBlendBack(
+      gfxContentType content, mozilla::gfx::Float aOpacity = 1.0f,
+      mozilla::gfx::SourceSurface* aMask = nullptr,
+      const mozilla::gfx::Matrix& aMaskTransform = mozilla::gfx::Matrix());
+
+  /**
+   * Like PushGroupForBlendBack, but if the current surface is
+   * gfxContentType::COLOR and content is gfxContentType::COLOR_ALPHA, makes the
+   * pushed surface gfxContentType::COLOR instead and copies the contents of the
+   * current surface to the pushed surface. This is good for pushing opacity
+   * groups, since blending the group back to the current surface with some
+   * alpha applied will give the correct results and using an opaque pushed
+   * surface gives better quality and performance.
+   */
+  void PushGroupAndCopyBackground(
+      gfxContentType content = gfxContentType::COLOR,
+      mozilla::gfx::Float aOpacity = 1.0f,
+      mozilla::gfx::SourceSurface* aMask = nullptr,
+      const mozilla::gfx::Matrix& aMaskTransform = mozilla::gfx::Matrix());
+  void PopGroupAndBlend();
+
+  mozilla::gfx::Point GetDeviceOffset() const;
+  void SetDeviceOffset(const mozilla::gfx::Point& aOffset);
+
+#ifdef MOZ_DUMP_PAINTING
+  /**
+   * Debug functions to encode the current surface as a PNG and export it.
+   */
+
+  /**
+   * Writes a binary PNG file.
+   */
+  void WriteAsPNG(const char* aFile);
+
+  /**
+   * Write as a PNG encoded Data URL to stdout.
+   */
+  void DumpAsDataURI();
+
+  /**
+   * Copy a PNG encoded Data URL to the clipboard.
+   */
+  void CopyAsDataURI();
+#endif
+
+  static mozilla::gfx::UserDataKey sDontUseAsSourceKey;
+
+ private:
+  /**
+   * Initialize this context from a DrawTarget.
+   * Strips any transform from aTarget.
+   * aTarget will be flushed in the gfxContext's destructor.  Use the static
+   * ContextForDrawTargetNoTransform() when you want this behavior, as that
+   * version deals with null DrawTarget better.
+   */
+  explicit gfxContext(
+      mozilla::gfx::DrawTarget* aTarget,
+      const mozilla::gfx::Point& aDeviceOffset = mozilla::gfx::Point());
+  ~gfxContext();
+
+  friend class PatternFromState;
+  friend class GlyphBufferAzure;
+
+  typedef mozilla::gfx::Matrix Matrix;
+  typedef mozilla::gfx::DrawTarget DrawTarget;
+  typedef mozilla::gfx::sRGBColor sRGBColor;
+  typedef mozilla::gfx::DeviceColor DeviceColor;
+  typedef mozilla::gfx::StrokeOptions StrokeOptions;
+  typedef mozilla::gfx::PathBuilder PathBuilder;
+  typedef mozilla::gfx::SourceSurface SourceSurface;
+
+  struct AzureState {
+    AzureState()
+        : op(mozilla::gfx::CompositionOp::OP_OVER),
+          color(0, 0, 0, 1.0f),
+          aaMode(mozilla::gfx::AntialiasMode::SUBPIXEL),
+          patternTransformChanged(false)
+#ifdef DEBUG
+          ,
+          mContentChanged(false)
+#endif
+    {
+    }
+
+    mozilla::gfx::CompositionOp op;
+    DeviceColor color;
+    RefPtr<gfxPattern> pattern;
+    Matrix transform;
+    struct PushedClip {
+      RefPtr<Path> path;
+      Rect rect;
+      Matrix transform;
+    };
+    CopyableTArray<PushedClip> pushedClips;
+    CopyableTArray<Float> dashPattern;
+    StrokeOptions strokeOptions;
+    RefPtr<DrawTarget> drawTarget;
+    mozilla::gfx::AntialiasMode aaMode;
+    bool patternTransformChanged;
+    Matrix patternTransform;
+    DeviceColor fontSmoothingBackgroundColor;
+    // This is used solely for using minimal intermediate surface size.
+    mozilla::gfx::Point deviceOffset;
+#ifdef DEBUG
+    // Whether the content of this AzureState changed after construction.
+    bool mContentChanged;
+#endif
+  };
+
+  // This ensures mPath contains a valid path (in user space!)
+  void EnsurePath();
+  // This ensures mPathBuilder contains a valid PathBuilder (in user space!)
+  void EnsurePathBuilder();
+  CompositionOp GetOp();
+  void ChangeTransform(const mozilla::gfx::Matrix& aNewMatrix,
+                       bool aUpdatePatternTransform = true);
+  Rect GetAzureDeviceSpaceClipBounds() const;
+  Matrix GetDTTransform() const;
+
+  bool mPathIsRect;
+  bool mTransformChanged;
+  Matrix mPathTransform;
+  Rect mRect;
+  RefPtr<PathBuilder> mPathBuilder;
+  RefPtr<Path> mPath;
+  Matrix mTransform;
+  nsTArray<AzureState> mStateStack;
+
+  AzureState& CurrentState() { return mStateStack[mStateStack.Length() - 1]; }
+  const AzureState& CurrentState() const {
+    return mStateStack[mStateStack.Length() - 1];
+  }
+
+  RefPtr<DrawTarget> mDT;
+};
+
+/**
+ * Sentry helper class for functions with multiple return points that need to
+ * call Save() on a gfxContext and have Restore() called automatically on the
+ * gfxContext before they return.
+ */
+class gfxContextAutoSaveRestore {
+ public:
+  gfxContextAutoSaveRestore() : mContext(nullptr) {}
+
+  explicit gfxContextAutoSaveRestore(gfxContext* aContext)
+      : mContext(aContext) {
+    mContext->Save();
+  }
+
+  ~gfxContextAutoSaveRestore() { Restore(); }
+
+  void SetContext(gfxContext* aContext) {
+    NS_ASSERTION(!mContext, "Not going to call Restore() on some context!!!");
+    mContext = aContext;
+    mContext->Save();
+  }
+
+  void EnsureSaved(gfxContext* aContext) {
+    MOZ_ASSERT(!mContext || mContext == aContext, "wrong context");
+    if (!mContext) {
+      mContext = aContext;
+      mContext->Save();
+    }
+  }
+
+  void Restore() {
+    if (mContext) {
+      mContext->Restore();
+      mContext = nullptr;
+    }
+  }
+
+ private:
+  gfxContext* mContext;
+};
+
+/**
+ * Sentry helper class for functions with multiple return points that need to
+ * back up the current matrix of a context and have it automatically restored
+ * before they return.
+ */
+class gfxContextMatrixAutoSaveRestore {
+ public:
+  gfxContextMatrixAutoSaveRestore() : mContext(nullptr) {}
+
+  explicit gfxContextMatrixAutoSaveRestore(gfxContext* aContext)
+      : mContext(aContext), mMatrix(aContext->CurrentMatrix()) {}
+
+  ~gfxContextMatrixAutoSaveRestore() {
+    if (mContext) {
+      mContext->SetMatrix(mMatrix);
+    }
+  }
+
+  void SetContext(gfxContext* aContext) {
+    NS_ASSERTION(!mContext, "Not going to restore the matrix on some context!");
+    mContext = aContext;
+    mMatrix = aContext->CurrentMatrix();
+  }
+
+  void Restore() {
+    if (mContext) {
+      mContext->SetMatrix(mMatrix);
+      mContext = nullptr;
+    }
+  }
+
+  const mozilla::gfx::Matrix& Matrix() {
+    MOZ_ASSERT(mContext, "mMatrix doesn't contain a useful matrix");
+    return mMatrix;
+  }
+
+  bool HasMatrix() const { return !!mContext; }
+
+ private:
+  gfxContext* mContext;
+  mozilla::gfx::Matrix mMatrix;
+};
+
+class DrawTargetAutoDisableSubpixelAntialiasing {
+ public:
+  typedef mozilla::gfx::DrawTarget DrawTarget;
+
+  DrawTargetAutoDisableSubpixelAntialiasing(DrawTarget* aDT, bool aDisable)
+      : mSubpixelAntialiasingEnabled(false) {
+    if (aDisable) {
+      mDT = aDT;
+      mSubpixelAntialiasingEnabled = mDT->GetPermitSubpixelAA();
+      mDT->SetPermitSubpixelAA(false);
+    }
+  }
+  ~DrawTargetAutoDisableSubpixelAntialiasing() {
+    if (mDT) {
+      mDT->SetPermitSubpixelAA(mSubpixelAntialiasingEnabled);
+    }
+  }
+
+ private:
+  RefPtr<DrawTarget> mDT;
+  bool mSubpixelAntialiasingEnabled;
+};
+
+/* This class lives on the stack and allows gfxContext users to easily, and
+ * performantly get a gfx::Pattern to use for drawing in their current context.
+ */
+class PatternFromState {
+ public:
+  explicit PatternFromState(gfxContext* aContext)
+      : mContext(aContext), mPattern(nullptr) {}
+  ~PatternFromState() {
+    if (mPattern) {
+      mPattern->~Pattern();
+    }
+  }
+
+  operator mozilla::gfx::Pattern&();
+
+ private:
+  union {
+    mozilla::AlignedStorage2<mozilla::gfx::ColorPattern> mColorPattern;
+    mozilla::AlignedStorage2<mozilla::gfx::SurfacePattern> mSurfacePattern;
+  };
+
+  gfxContext* mContext;
+  mozilla::gfx::Pattern* mPattern;
+};
+
+/* This interface should be implemented to handle exporting the clip from a
+ * context.
+ */
+class ClipExporter : public mozilla::gfx::PathSink {
+ public:
+  virtual void BeginClip(const mozilla::gfx::Matrix& aMatrix) = 0;
+  virtual void EndClip() = 0;
+};
+
+#endif /* GFX_CONTEXT_H */