Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2010 insertions, 0 deletions

diff --git a/gfx/2d/DrawTargetCairo.cpp b/gfx/2d/DrawTargetCairo.cpp
new file mode 100644
index 0000000000..2121839e4b
--- /dev/null
+++ b/gfx/2d/DrawTargetCairo.cpp
@@ -0,0 +1,2010 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 "DrawTargetCairo.h"
+
+#include "SourceSurfaceCairo.h"
+#include "PathCairo.h"
+#include "HelpersCairo.h"
+#include "BorrowedContext.h"
+#include "FilterNodeSoftware.h"
+#include "mozilla/Scoped.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/Vector.h"
+#include "mozilla/StaticPrefs_gfx.h"
+#include "mozilla/StaticPrefs_print.h"
+#include "nsPrintfCString.h"
+
+#include "cairo.h"
+#include "cairo-tee.h"
+#include <string.h>
+
+#include "Blur.h"
+#include "Logging.h"
+#include "Tools.h"
+
+#ifdef CAIRO_HAS_QUARTZ_SURFACE
+#  include "cairo-quartz.h"
+#  ifdef MOZ_WIDGET_COCOA
+#    include <ApplicationServices/ApplicationServices.h>
+#  endif
+#endif
+
+#ifdef CAIRO_HAS_XLIB_SURFACE
+#  include "cairo-xlib.h"
+#endif
+
+#ifdef CAIRO_HAS_WIN32_SURFACE
+#  include "cairo-win32.h"
+#endif
+
+#define PIXMAN_DONT_DEFINE_STDINT
+#include "pixman.h"
+
+#include <algorithm>
+
+// 2^23
+#define CAIRO_COORD_MAX (Float(0x7fffff))
+
+namespace mozilla {
+
+MOZ_TYPE_SPECIFIC_SCOPED_POINTER_TEMPLATE(ScopedCairoSurface, cairo_surface_t,
+                                          cairo_surface_destroy);
+
+namespace gfx {
+
+cairo_surface_t* DrawTargetCairo::mDummySurface;
+
+namespace {
+
+// An RAII class to prepare to draw a context and optional path. Saves and
+// restores the context on construction/destruction.
+class AutoPrepareForDrawing {
+ public:
+  AutoPrepareForDrawing(DrawTargetCairo* dt, cairo_t* ctx) : mCtx(ctx) {
+    dt->PrepareForDrawing(ctx);
+    cairo_save(mCtx);
+    MOZ_ASSERT(cairo_status(mCtx) ||
+               dt->GetTransform().FuzzyEquals(GetTransform()));
+  }
+
+  AutoPrepareForDrawing(DrawTargetCairo* dt, cairo_t* ctx, const Path* path)
+      : mCtx(ctx) {
+    dt->PrepareForDrawing(ctx, path);
+    cairo_save(mCtx);
+    MOZ_ASSERT(cairo_status(mCtx) ||
+               dt->GetTransform().FuzzyEquals(GetTransform()));
+  }
+
+  ~AutoPrepareForDrawing() {
+    cairo_restore(mCtx);
+    cairo_status_t status = cairo_status(mCtx);
+    if (status) {
+      gfxWarning() << "DrawTargetCairo context in error state: "
+                   << cairo_status_to_string(status) << "(" << status << ")";
+    }
+  }
+
+ private:
+#ifdef DEBUG
+  Matrix GetTransform() {
+    cairo_matrix_t mat;
+    cairo_get_matrix(mCtx, &mat);
+    return Matrix(mat.xx, mat.yx, mat.xy, mat.yy, mat.x0, mat.y0);
+  }
+#endif
+
+  cairo_t* mCtx;
+};
+
+/* Clamp r to (0,0) (2^23,2^23)
+ * these are to be device coordinates.
+ *
+ * Returns false if the rectangle is completely out of bounds,
+ * true otherwise.
+ *
+ * This function assumes that it will be called with a rectangle being
+ * drawn into a surface with an identity transformation matrix; that
+ * is, anything above or to the left of (0,0) will be offscreen.
+ *
+ * First it checks if the rectangle is entirely beyond
+ * CAIRO_COORD_MAX; if so, it can't ever appear on the screen --
+ * false is returned.
+ *
+ * Then it shifts any rectangles with x/y < 0 so that x and y are = 0,
+ * and adjusts the width and height appropriately.  For example, a
+ * rectangle from (0,-5) with dimensions (5,10) will become a
+ * rectangle from (0,0) with dimensions (5,5).
+ *
+ * If after negative x/y adjustment to 0, either the width or height
+ * is negative, then the rectangle is completely offscreen, and
+ * nothing is drawn -- false is returned.
+ *
+ * Finally, if x+width or y+height are greater than CAIRO_COORD_MAX,
+ * the width and height are clamped such x+width or y+height are equal
+ * to CAIRO_COORD_MAX, and true is returned.
+ */
+static bool ConditionRect(Rect& r) {
+  // if either x or y is way out of bounds;
+  // note that we don't handle negative w/h here
+  if (r.X() > CAIRO_COORD_MAX || r.Y() > CAIRO_COORD_MAX) return false;
+
+  if (r.X() < 0.f) {
+    r.SetWidth(r.XMost());
+    if (r.Width() < 0.f) return false;
+    r.MoveToX(0.f);
+  }
+
+  if (r.XMost() > CAIRO_COORD_MAX) {
+    r.SetRightEdge(CAIRO_COORD_MAX);
+  }
+
+  if (r.Y() < 0.f) {
+    r.SetHeight(r.YMost());
+    if (r.Height() < 0.f) return false;
+
+    r.MoveToY(0.f);
+  }
+
+  if (r.YMost() > CAIRO_COORD_MAX) {
+    r.SetBottomEdge(CAIRO_COORD_MAX);
+  }
+  return true;
+}
+
+}  // end anonymous namespace
+
+static bool SupportsSelfCopy(cairo_surface_t* surface) {
+  switch (cairo_surface_get_type(surface)) {
+#ifdef CAIRO_HAS_QUARTZ_SURFACE
+    case CAIRO_SURFACE_TYPE_QUARTZ:
+      return true;
+#endif
+#ifdef CAIRO_HAS_WIN32_SURFACE
+    case CAIRO_SURFACE_TYPE_WIN32:
+    case CAIRO_SURFACE_TYPE_WIN32_PRINTING:
+      return true;
+#endif
+    default:
+      return false;
+  }
+}
+
+static bool PatternIsCompatible(const Pattern& aPattern) {
+  switch (aPattern.GetType()) {
+    case PatternType::LINEAR_GRADIENT: {
+      const LinearGradientPattern& pattern =
+          static_cast<const LinearGradientPattern&>(aPattern);
+      return pattern.mStops->GetBackendType() == BackendType::CAIRO;
+    }
+    case PatternType::RADIAL_GRADIENT: {
+      const RadialGradientPattern& pattern =
+          static_cast<const RadialGradientPattern&>(aPattern);
+      return pattern.mStops->GetBackendType() == BackendType::CAIRO;
+    }
+    case PatternType::CONIC_GRADIENT: {
+      const ConicGradientPattern& pattern =
+          static_cast<const ConicGradientPattern&>(aPattern);
+      return pattern.mStops->GetBackendType() == BackendType::CAIRO;
+    }
+    default:
+      return true;
+  }
+}
+
+static cairo_user_data_key_t surfaceDataKey;
+
+static void ReleaseData(void* aData) {
+  DataSourceSurface* data = static_cast<DataSourceSurface*>(aData);
+  data->Unmap();
+  data->Release();
+}
+
+static cairo_surface_t* CopyToImageSurface(unsigned char* aData,
+                                           const IntRect& aRect,
+                                           int32_t aStride,
+                                           SurfaceFormat aFormat) {
+  MOZ_ASSERT(aData);
+
+  auto aRectWidth = aRect.Width();
+  auto aRectHeight = aRect.Height();
+
+  cairo_surface_t* surf = cairo_image_surface_create(
+      GfxFormatToCairoFormat(aFormat), aRectWidth, aRectHeight);
+  // In certain scenarios, requesting larger than 8k image fails.  Bug 803568
+  // covers the details of how to run into it, but the full detailed
+  // investigation hasn't been done to determine the underlying cause.  We
+  // will just handle the failure to allocate the surface to avoid a crash.
+  if (cairo_surface_status(surf)) {
+    gfxWarning() << "Invalid surface DTC " << cairo_surface_status(surf);
+    return nullptr;
+  }
+
+  unsigned char* surfData = cairo_image_surface_get_data(surf);
+  int surfStride = cairo_image_surface_get_stride(surf);
+  int32_t pixelWidth = BytesPerPixel(aFormat);
+
+  unsigned char* source = aData + aRect.Y() * aStride + aRect.X() * pixelWidth;
+
+  MOZ_ASSERT(aStride >= aRectWidth * pixelWidth);
+  for (int32_t y = 0; y < aRectHeight; ++y) {
+    memcpy(surfData + y * surfStride, source + y * aStride,
+           aRectWidth * pixelWidth);
+  }
+  cairo_surface_mark_dirty(surf);
+  return surf;
+}
+
+/**
+ * If aSurface can be represented as a surface of type
+ * CAIRO_SURFACE_TYPE_IMAGE then returns that surface. Does
+ * not add a reference.
+ */
+static cairo_surface_t* GetAsImageSurface(cairo_surface_t* aSurface) {
+  if (cairo_surface_get_type(aSurface) == CAIRO_SURFACE_TYPE_IMAGE) {
+    return aSurface;
+#ifdef CAIRO_HAS_WIN32_SURFACE
+  } else if (cairo_surface_get_type(aSurface) == CAIRO_SURFACE_TYPE_WIN32) {
+    return cairo_win32_surface_get_image(aSurface);
+#endif
+  }
+
+  return nullptr;
+}
+
+static cairo_surface_t* CreateSubImageForData(unsigned char* aData,
+                                              const IntRect& aRect, int aStride,
+                                              SurfaceFormat aFormat) {
+  if (!aData) {
+    gfxWarning() << "DrawTargetCairo.CreateSubImageForData null aData";
+    return nullptr;
+  }
+  unsigned char* data =
+      aData + aRect.Y() * aStride + aRect.X() * BytesPerPixel(aFormat);
+
+  cairo_surface_t* image = cairo_image_surface_create_for_data(
+      data, GfxFormatToCairoFormat(aFormat), aRect.Width(), aRect.Height(),
+      aStride);
+  // Set the subimage's device offset so that in remains in the same place
+  // relative to the parent
+  cairo_surface_set_device_offset(image, -aRect.X(), -aRect.Y());
+  return image;
+}
+
+/**
+ * Returns a referenced cairo_surface_t representing the
+ * sub-image specified by aSubImage.
+ */
+static cairo_surface_t* ExtractSubImage(cairo_surface_t* aSurface,
+                                        const IntRect& aSubImage,
+                                        SurfaceFormat aFormat) {
+  // No need to worry about retaining a reference to the original
+  // surface since the only caller of this function guarantees
+  // that aSurface will stay alive as long as the result
+
+  cairo_surface_t* image = GetAsImageSurface(aSurface);
+  if (image) {
+    image =
+        CreateSubImageForData(cairo_image_surface_get_data(image), aSubImage,
+                              cairo_image_surface_get_stride(image), aFormat);
+    return image;
+  }
+
+  cairo_surface_t* similar = cairo_surface_create_similar(
+      aSurface, cairo_surface_get_content(aSurface), aSubImage.Width(),
+      aSubImage.Height());
+
+  cairo_t* ctx = cairo_create(similar);
+  cairo_set_operator(ctx, CAIRO_OPERATOR_SOURCE);
+  cairo_set_source_surface(ctx, aSurface, -aSubImage.X(), -aSubImage.Y());
+  cairo_paint(ctx);
+  cairo_destroy(ctx);
+
+  cairo_surface_set_device_offset(similar, -aSubImage.X(), -aSubImage.Y());
+  return similar;
+}
+
+/**
+ * Returns cairo surface for the given SourceSurface.
+ * If possible, it will use the cairo_surface associated with aSurface,
+ * otherwise, it will create a new cairo_surface.
+ * In either case, the caller must call cairo_surface_destroy on the
+ * result when it is done with it.
+ */
+static cairo_surface_t* GetCairoSurfaceForSourceSurface(
+    SourceSurface* aSurface, bool aExistingOnly = false,
+    const IntRect& aSubImage = IntRect()) {
+  if (!aSurface) {
+    return nullptr;
+  }
+
+  IntRect subimage = IntRect(IntPoint(), aSurface->GetSize());
+  if (!aSubImage.IsEmpty()) {
+    MOZ_ASSERT(!aExistingOnly);
+    MOZ_ASSERT(subimage.Contains(aSubImage));
+    subimage = aSubImage;
+  }
+
+  if (aSurface->GetType() == SurfaceType::CAIRO) {
+    cairo_surface_t* surf =
+        static_cast<SourceSurfaceCairo*>(aSurface)->GetSurface();
+    if (aSubImage.IsEmpty()) {
+      cairo_surface_reference(surf);
+    } else {
+      surf = ExtractSubImage(surf, subimage, aSurface->GetFormat());
+    }
+    return surf;
+  }
+
+  if (aSurface->GetType() == SurfaceType::CAIRO_IMAGE) {
+    cairo_surface_t* surf =
+        static_cast<const DataSourceSurfaceCairo*>(aSurface)->GetSurface();
+    if (aSubImage.IsEmpty()) {
+      cairo_surface_reference(surf);
+    } else {
+      surf = ExtractSubImage(surf, subimage, aSurface->GetFormat());
+    }
+    return surf;
+  }
+
+  if (aExistingOnly) {
+    return nullptr;
+  }
+
+  RefPtr<DataSourceSurface> data = aSurface->GetDataSurface();
+  if (!data) {
+    return nullptr;
+  }
+
+  DataSourceSurface::MappedSurface map;
+  if (!data->Map(DataSourceSurface::READ, &map)) {
+    return nullptr;
+  }
+
+  cairo_surface_t* surf = CreateSubImageForData(map.mData, subimage,
+                                                map.mStride, data->GetFormat());
+
+  // In certain scenarios, requesting larger than 8k image fails.  Bug 803568
+  // covers the details of how to run into it, but the full detailed
+  // investigation hasn't been done to determine the underlying cause.  We
+  // will just handle the failure to allocate the surface to avoid a crash.
+  if (!surf || cairo_surface_status(surf)) {
+    if (surf && (cairo_surface_status(surf) == CAIRO_STATUS_INVALID_STRIDE)) {
+      // If we failed because of an invalid stride then copy into
+      // a new surface with a stride that cairo chooses. No need to
+      // set user data since we're not dependent on the original
+      // data.
+      cairo_surface_t* result = CopyToImageSurface(
+          map.mData, subimage, map.mStride, data->GetFormat());
+      data->Unmap();
+      return result;
+    }
+    data->Unmap();
+    return nullptr;
+  }
+
+  cairo_surface_set_user_data(surf, &surfaceDataKey, data.forget().take(),
+                              ReleaseData);
+  return surf;
+}
+
+// An RAII class to temporarily clear any device offset set
+// on a surface. Note that this does not take a reference to the
+// surface.
+class AutoClearDeviceOffset final {
+ public:
+  explicit AutoClearDeviceOffset(SourceSurface* aSurface)
+      : mSurface(nullptr), mX(0), mY(0) {
+    Init(aSurface);
+  }
+
+  explicit AutoClearDeviceOffset(const Pattern& aPattern)
+      : mSurface(nullptr), mX(0.0), mY(0.0) {
+    if (aPattern.GetType() == PatternType::SURFACE) {
+      const SurfacePattern& pattern =
+          static_cast<const SurfacePattern&>(aPattern);
+      Init(pattern.mSurface);
+    }
+  }
+
+  ~AutoClearDeviceOffset() {
+    if (mSurface) {
+      cairo_surface_set_device_offset(mSurface, mX, mY);
+    }
+  }
+
+ private:
+  void Init(SourceSurface* aSurface) {
+    cairo_surface_t* surface = GetCairoSurfaceForSourceSurface(aSurface, true);
+    if (surface) {
+      Init(surface);
+      cairo_surface_destroy(surface);
+    }
+  }
+
+  void Init(cairo_surface_t* aSurface) {
+    mSurface = aSurface;
+    cairo_surface_get_device_offset(mSurface, &mX, &mY);
+    cairo_surface_set_device_offset(mSurface, 0, 0);
+  }
+
+  cairo_surface_t* mSurface;
+  double mX;
+  double mY;
+};
+
+static inline void CairoPatternAddGradientStop(cairo_pattern_t* aPattern,
+                                               const GradientStop& aStop,
+                                               Float aNudge = 0) {
+  cairo_pattern_add_color_stop_rgba(aPattern, aStop.offset + aNudge,
+                                    aStop.color.r, aStop.color.g, aStop.color.b,
+                                    aStop.color.a);
+}
+
+// Never returns nullptr. As such, you must always pass in Cairo-compatible
+// patterns, most notably gradients with a GradientStopCairo.
+// The pattern returned must have cairo_pattern_destroy() called on it by the
+// caller.
+// As the cairo_pattern_t returned may depend on the Pattern passed in, the
+// lifetime of the cairo_pattern_t returned must not exceed the lifetime of the
+// Pattern passed in.
+static cairo_pattern_t* GfxPatternToCairoPattern(const Pattern& aPattern,
+                                                 Float aAlpha,
+                                                 const Matrix& aTransform) {
+  cairo_pattern_t* pat;
+  const Matrix* matrix = nullptr;
+
+  switch (aPattern.GetType()) {
+    case PatternType::COLOR: {
+      DeviceColor color = static_cast<const ColorPattern&>(aPattern).mColor;
+      pat = cairo_pattern_create_rgba(color.r, color.g, color.b,
+                                      color.a * aAlpha);
+      break;
+    }
+
+    case PatternType::SURFACE: {
+      const SurfacePattern& pattern =
+          static_cast<const SurfacePattern&>(aPattern);
+      cairo_surface_t* surf = GetCairoSurfaceForSourceSurface(
+          pattern.mSurface, false, pattern.mSamplingRect);
+      if (!surf) return nullptr;
+
+      pat = cairo_pattern_create_for_surface(surf);
+
+      matrix = &pattern.mMatrix;
+
+      cairo_pattern_set_filter(
+          pat, GfxSamplingFilterToCairoFilter(pattern.mSamplingFilter));
+      cairo_pattern_set_extend(pat,
+                               GfxExtendToCairoExtend(pattern.mExtendMode));
+
+      cairo_surface_destroy(surf);
+      break;
+    }
+    case PatternType::LINEAR_GRADIENT: {
+      const LinearGradientPattern& pattern =
+          static_cast<const LinearGradientPattern&>(aPattern);
+
+      pat = cairo_pattern_create_linear(pattern.mBegin.x, pattern.mBegin.y,
+                                        pattern.mEnd.x, pattern.mEnd.y);
+
+      MOZ_ASSERT(pattern.mStops->GetBackendType() == BackendType::CAIRO);
+      GradientStopsCairo* cairoStops =
+          static_cast<GradientStopsCairo*>(pattern.mStops.get());
+      cairo_pattern_set_extend(
+          pat, GfxExtendToCairoExtend(cairoStops->GetExtendMode()));
+
+      matrix = &pattern.mMatrix;
+
+      const std::vector<GradientStop>& stops = cairoStops->GetStops();
+      for (size_t i = 0; i < stops.size(); ++i) {
+        CairoPatternAddGradientStop(pat, stops[i]);
+      }
+
+      break;
+    }
+    case PatternType::RADIAL_GRADIENT: {
+      const RadialGradientPattern& pattern =
+          static_cast<const RadialGradientPattern&>(aPattern);
+
+      pat = cairo_pattern_create_radial(pattern.mCenter1.x, pattern.mCenter1.y,
+                                        pattern.mRadius1, pattern.mCenter2.x,
+                                        pattern.mCenter2.y, pattern.mRadius2);
+
+      MOZ_ASSERT(pattern.mStops->GetBackendType() == BackendType::CAIRO);
+      GradientStopsCairo* cairoStops =
+          static_cast<GradientStopsCairo*>(pattern.mStops.get());
+      cairo_pattern_set_extend(
+          pat, GfxExtendToCairoExtend(cairoStops->GetExtendMode()));
+
+      matrix = &pattern.mMatrix;
+
+      const std::vector<GradientStop>& stops = cairoStops->GetStops();
+      for (size_t i = 0; i < stops.size(); ++i) {
+        CairoPatternAddGradientStop(pat, stops[i]);
+      }
+
+      break;
+    }
+    case PatternType::CONIC_GRADIENT: {
+      // XXX(ntim): Bug 1617039 - Implement conic-gradient for Cairo
+      pat = cairo_pattern_create_rgba(0.0, 0.0, 0.0, 0.0);
+
+      break;
+    }
+    default: {
+      // We should support all pattern types!
+      MOZ_ASSERT(false);
+    }
+  }
+
+  // The pattern matrix is a matrix that transforms the pattern into user
+  // space. Cairo takes a matrix that converts from user space to pattern
+  // space. Cairo therefore needs the inverse.
+  if (matrix) {
+    cairo_matrix_t mat;
+    GfxMatrixToCairoMatrix(*matrix, mat);
+    cairo_matrix_invert(&mat);
+    cairo_pattern_set_matrix(pat, &mat);
+  }
+
+  return pat;
+}
+
+static bool NeedIntermediateSurface(const Pattern& aPattern,
+                                    const DrawOptions& aOptions) {
+  // We pre-multiply colours' alpha by the global alpha, so we don't need to
+  // use an intermediate surface for them.
+  if (aPattern.GetType() == PatternType::COLOR) return false;
+
+  if (aOptions.mAlpha == 1.0) return false;
+
+  return true;
+}
+
+DrawTargetCairo::DrawTargetCairo()
+    : mContext(nullptr),
+      mSurface(nullptr),
+      mTransformSingular(false),
+      mLockedBits(nullptr),
+      mFontOptions(nullptr) {}
+
+DrawTargetCairo::~DrawTargetCairo() {
+  cairo_destroy(mContext);
+  if (mSurface) {
+    cairo_surface_destroy(mSurface);
+    mSurface = nullptr;
+  }
+  if (mFontOptions) {
+    cairo_font_options_destroy(mFontOptions);
+    mFontOptions = nullptr;
+  }
+  MOZ_ASSERT(!mLockedBits);
+}
+
+bool DrawTargetCairo::IsValid() const {
+  return mSurface && !cairo_surface_status(mSurface) && mContext &&
+         !cairo_surface_status(cairo_get_group_target(mContext));
+}
+
+DrawTargetType DrawTargetCairo::GetType() const {
+  if (mContext) {
+    cairo_surface_type_t type = cairo_surface_get_type(mSurface);
+    if (type == CAIRO_SURFACE_TYPE_TEE) {
+      type = cairo_surface_get_type(cairo_tee_surface_index(mSurface, 0));
+      MOZ_ASSERT(type != CAIRO_SURFACE_TYPE_TEE, "C'mon!");
+      MOZ_ASSERT(
+          type == cairo_surface_get_type(cairo_tee_surface_index(mSurface, 1)),
+          "What should we do here?");
+    }
+    switch (type) {
+      case CAIRO_SURFACE_TYPE_PDF:
+      case CAIRO_SURFACE_TYPE_PS:
+      case CAIRO_SURFACE_TYPE_SVG:
+      case CAIRO_SURFACE_TYPE_WIN32_PRINTING:
+      case CAIRO_SURFACE_TYPE_XML:
+        return DrawTargetType::VECTOR;
+
+      case CAIRO_SURFACE_TYPE_VG:
+      case CAIRO_SURFACE_TYPE_GL:
+      case CAIRO_SURFACE_TYPE_GLITZ:
+      case CAIRO_SURFACE_TYPE_QUARTZ:
+      case CAIRO_SURFACE_TYPE_DIRECTFB:
+        return DrawTargetType::HARDWARE_RASTER;
+
+      case CAIRO_SURFACE_TYPE_SKIA:
+      case CAIRO_SURFACE_TYPE_QT:
+        MOZ_FALLTHROUGH_ASSERT(
+            "Can't determine actual DrawTargetType for DrawTargetCairo - "
+            "assuming SOFTWARE_RASTER");
+      case CAIRO_SURFACE_TYPE_IMAGE:
+      case CAIRO_SURFACE_TYPE_XLIB:
+      case CAIRO_SURFACE_TYPE_XCB:
+      case CAIRO_SURFACE_TYPE_WIN32:
+      case CAIRO_SURFACE_TYPE_BEOS:
+      case CAIRO_SURFACE_TYPE_OS2:
+      case CAIRO_SURFACE_TYPE_QUARTZ_IMAGE:
+      case CAIRO_SURFACE_TYPE_SCRIPT:
+      case CAIRO_SURFACE_TYPE_RECORDING:
+      case CAIRO_SURFACE_TYPE_DRM:
+      case CAIRO_SURFACE_TYPE_SUBSURFACE:
+      case CAIRO_SURFACE_TYPE_TEE:  // included to silence warning about
+                                    // unhandled enum value
+        return DrawTargetType::SOFTWARE_RASTER;
+      default:
+        MOZ_CRASH("GFX: Unsupported cairo surface type");
+    }
+  }
+  MOZ_ASSERT(false, "Could not determine DrawTargetType for DrawTargetCairo");
+  return DrawTargetType::SOFTWARE_RASTER;
+}
+
+IntSize DrawTargetCairo::GetSize() const { return mSize; }
+
+SurfaceFormat GfxFormatForCairoSurface(cairo_surface_t* surface) {
+  cairo_surface_type_t type = cairo_surface_get_type(surface);
+  if (type == CAIRO_SURFACE_TYPE_IMAGE) {
+    return CairoFormatToGfxFormat(cairo_image_surface_get_format(surface));
+  }
+#ifdef CAIRO_HAS_XLIB_SURFACE
+  // xlib is currently the only Cairo backend that creates 16bpp surfaces
+  if (type == CAIRO_SURFACE_TYPE_XLIB &&
+      cairo_xlib_surface_get_depth(surface) == 16) {
+    return SurfaceFormat::R5G6B5_UINT16;
+  }
+#endif
+  return CairoContentToGfxFormat(cairo_surface_get_content(surface));
+}
+
+void DrawTargetCairo::Link(const char* aDestination, const Rect& aRect) {
+  if (!aDestination || !*aDestination) {
+    // No destination? Just bail out.
+    return;
+  }
+
+  // We need to \-escape any single-quotes in the destination string, in order
+  // to pass it via the attributes arg to cairo_tag_begin.
+  //
+  // We also need to escape any backslashes (bug 1748077), as per doc at
+  // https://www.cairographics.org/manual/cairo-Tags-and-Links.html#cairo-tag-begin
+  // The cairo-pdf-interchange backend (used on all platforms EXCEPT macOS)
+  // actually requires that we *doubly* escape the backslashes (this may be a
+  // cairo bug), while the quartz backend is fine with them singly-escaped.
+  //
+  // (Encoding of non-ASCII chars etc gets handled later by the PDF backend.)
+  nsAutoCString dest(aDestination);
+  for (size_t i = dest.Length(); i > 0;) {
+    --i;
+    if (dest[i] == '\'') {
+      dest.ReplaceLiteral(i, 1, "\\'");
+    } else if (dest[i] == '\\') {
+#ifdef XP_MACOSX
+      dest.ReplaceLiteral(i, 1, "\\\\");
+#else
+      dest.ReplaceLiteral(i, 1, "\\\\\\\\");
+#endif
+    }
+  }
+
+  double x = aRect.x, y = aRect.y, w = aRect.width, h = aRect.height;
+  cairo_user_to_device(mContext, &x, &y);
+  cairo_user_to_device_distance(mContext, &w, &h);
+
+  nsPrintfCString attributes("rect=[%f %f %f %f] ", x, y, w, h);
+  if (dest[0] == '#') {
+    // The actual destination does not have a leading '#'.
+    attributes.AppendPrintf("dest='%s'", dest.get() + 1);
+  } else {
+    attributes.AppendPrintf("uri='%s'", dest.get());
+  }
+
+  // We generate a begin/end pair with no content in between, because we are
+  // using the rect attribute of the begin tag to specify the link region
+  // rather than depending on cairo to accumulate the painted area.
+  cairo_tag_begin(mContext, CAIRO_TAG_LINK, attributes.get());
+  cairo_tag_end(mContext, CAIRO_TAG_LINK);
+}
+
+void DrawTargetCairo::Destination(const char* aDestination,
+                                  const Point& aPoint) {
+  if (!aDestination || !*aDestination) {
+    // No destination? Just bail out.
+    return;
+  }
+
+  nsAutoCString dest(aDestination);
+  for (size_t i = dest.Length(); i > 0;) {
+    --i;
+    if (dest[i] == '\'') {
+      dest.ReplaceLiteral(i, 1, "\\'");
+    }
+  }
+
+  double x = aPoint.x, y = aPoint.y;
+  cairo_user_to_device(mContext, &x, &y);
+
+  nsPrintfCString attributes("name='%s' x=%f y=%f internal", dest.get(), x, y);
+  cairo_tag_begin(mContext, CAIRO_TAG_DEST, attributes.get());
+  cairo_tag_end(mContext, CAIRO_TAG_DEST);
+}
+
+already_AddRefed<SourceSurface> DrawTargetCairo::Snapshot() {
+  if (!IsValid()) {
+    gfxCriticalNote << "DrawTargetCairo::Snapshot with bad surface "
+                    << hexa(mSurface) << ", context " << hexa(mContext)
+                    << ", status "
+                    << (mSurface ? cairo_surface_status(mSurface) : -1);
+    return nullptr;
+  }
+  if (mSnapshot) {
+    RefPtr<SourceSurface> snapshot(mSnapshot);
+    return snapshot.forget();
+  }
+
+  IntSize size = GetSize();
+
+  mSnapshot = new SourceSurfaceCairo(mSurface, size,
+                                     GfxFormatForCairoSurface(mSurface), this);
+  RefPtr<SourceSurface> snapshot(mSnapshot);
+  return snapshot.forget();
+}
+
+bool DrawTargetCairo::LockBits(uint8_t** aData, IntSize* aSize,
+                               int32_t* aStride, SurfaceFormat* aFormat,
+                               IntPoint* aOrigin) {
+  cairo_surface_t* target = cairo_get_group_target(mContext);
+  cairo_surface_t* surf = target;
+#ifdef CAIRO_HAS_WIN32_SURFACE
+  if (cairo_surface_get_type(surf) == CAIRO_SURFACE_TYPE_WIN32) {
+    cairo_surface_t* imgsurf = cairo_win32_surface_get_image(surf);
+    if (imgsurf) {
+      surf = imgsurf;
+    }
+  }
+#endif
+  if (cairo_surface_get_type(surf) == CAIRO_SURFACE_TYPE_IMAGE &&
+      cairo_surface_status(surf) == CAIRO_STATUS_SUCCESS) {
+    PointDouble offset;
+    cairo_surface_get_device_offset(target, &offset.x.value, &offset.y.value);
+    // verify the device offset can be converted to integers suitable for a
+    // bounds rect
+    IntPoint origin(int32_t(-offset.x), int32_t(-offset.y));
+    if (-PointDouble(origin) != offset || (!aOrigin && origin != IntPoint())) {
+      return false;
+    }
+
+    WillChange();
+    Flush();
+
+    mLockedBits = cairo_image_surface_get_data(surf);
+    *aData = mLockedBits;
+    *aSize = IntSize(cairo_image_surface_get_width(surf),
+                     cairo_image_surface_get_height(surf));
+    *aStride = cairo_image_surface_get_stride(surf);
+    *aFormat = CairoFormatToGfxFormat(cairo_image_surface_get_format(surf));
+    if (aOrigin) {
+      *aOrigin = origin;
+    }
+    return true;
+  }
+
+  return false;
+}
+
+void DrawTargetCairo::ReleaseBits(uint8_t* aData) {
+  MOZ_ASSERT(mLockedBits == aData);
+  mLockedBits = nullptr;
+  cairo_surface_t* surf = cairo_get_group_target(mContext);
+#ifdef CAIRO_HAS_WIN32_SURFACE
+  if (cairo_surface_get_type(surf) == CAIRO_SURFACE_TYPE_WIN32) {
+    cairo_surface_t* imgsurf = cairo_win32_surface_get_image(surf);
+    if (imgsurf) {
+      cairo_surface_mark_dirty(imgsurf);
+    }
+  }
+#endif
+  cairo_surface_mark_dirty(surf);
+}
+
+void DrawTargetCairo::Flush() {
+  cairo_surface_t* surf = cairo_get_group_target(mContext);
+  cairo_surface_flush(surf);
+}
+
+void DrawTargetCairo::PrepareForDrawing(cairo_t* aContext,
+                                        const Path* aPath /* = nullptr */) {
+  WillChange(aPath);
+}
+
+cairo_surface_t* DrawTargetCairo::GetDummySurface() {
+  if (mDummySurface) {
+    return mDummySurface;
+  }
+
+  mDummySurface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 1, 1);
+
+  return mDummySurface;
+}
+
+static void PaintWithAlpha(cairo_t* aContext, const DrawOptions& aOptions) {
+  if (aOptions.mCompositionOp == CompositionOp::OP_SOURCE) {
+    // Cairo treats the source operator like a lerp when alpha is < 1.
+    // Approximate the desired operator by: out = 0; out += src*alpha;
+    if (aOptions.mAlpha == 1) {
+      cairo_set_operator(aContext, CAIRO_OPERATOR_SOURCE);
+      cairo_paint(aContext);
+    } else {
+      cairo_set_operator(aContext, CAIRO_OPERATOR_CLEAR);
+      cairo_paint(aContext);
+      cairo_set_operator(aContext, CAIRO_OPERATOR_ADD);
+      cairo_paint_with_alpha(aContext, aOptions.mAlpha);
+    }
+  } else {
+    cairo_set_operator(aContext, GfxOpToCairoOp(aOptions.mCompositionOp));
+    cairo_paint_with_alpha(aContext, aOptions.mAlpha);
+  }
+}
+
+void DrawTargetCairo::DrawSurface(SourceSurface* aSurface, const Rect& aDest,
+                                  const Rect& aSource,
+                                  const DrawSurfaceOptions& aSurfOptions,
+                                  const DrawOptions& aOptions) {
+  if (mTransformSingular || aDest.IsEmpty()) {
+    return;
+  }
+
+  if (!IsValid() || !aSurface) {
+    gfxCriticalNote << "DrawSurface with bad surface "
+                    << cairo_surface_status(cairo_get_group_target(mContext));
+    return;
+  }
+
+  AutoPrepareForDrawing prep(this, mContext);
+  AutoClearDeviceOffset clear(aSurface);
+
+  float sx = aSource.Width() / aDest.Width();
+  float sy = aSource.Height() / aDest.Height();
+
+  cairo_matrix_t src_mat;
+  cairo_matrix_init_translate(&src_mat, aSource.X() - aSurface->GetRect().x,
+                              aSource.Y() - aSurface->GetRect().y);
+  cairo_matrix_scale(&src_mat, sx, sy);
+
+  cairo_surface_t* surf = GetCairoSurfaceForSourceSurface(aSurface);
+  if (!surf) {
+    gfxWarning()
+        << "Failed to create cairo surface for DrawTargetCairo::DrawSurface";
+    return;
+  }
+  cairo_pattern_t* pat = cairo_pattern_create_for_surface(surf);
+  cairo_surface_destroy(surf);
+
+  cairo_pattern_set_matrix(pat, &src_mat);
+  cairo_pattern_set_filter(
+      pat, GfxSamplingFilterToCairoFilter(aSurfOptions.mSamplingFilter));
+  // For PDF output, we avoid using EXTEND_PAD here because floating-point
+  // error accumulation may lead cairo_pdf_surface to conclude that padding
+  // is needed due to an apparent one- or two-pixel mismatch between source
+  // pattern and destination rect sizes when we're rendering a pdf.js page,
+  // and this forces undesirable fallback to the rasterization codepath
+  // instead of simply replaying the recording.
+  // (See bug 1777209.)
+  cairo_pattern_set_extend(
+      pat, cairo_surface_get_type(mSurface) == CAIRO_SURFACE_TYPE_PDF
+               ? CAIRO_EXTEND_NONE
+               : CAIRO_EXTEND_PAD);
+
+  cairo_set_antialias(mContext,
+                      GfxAntialiasToCairoAntialias(aOptions.mAntialiasMode));
+
+  // If the destination rect covers the entire clipped area, then unbounded and
+  // bounded operations are identical, and we don't need to push a group.
+  bool needsGroup = !IsOperatorBoundByMask(aOptions.mCompositionOp) &&
+                    !aDest.Contains(GetUserSpaceClip());
+
+  cairo_translate(mContext, aDest.X(), aDest.Y());
+
+  if (needsGroup) {
+    cairo_push_group(mContext);
+    cairo_new_path(mContext);
+    cairo_rectangle(mContext, 0, 0, aDest.Width(), aDest.Height());
+    cairo_set_source(mContext, pat);
+    cairo_fill(mContext);
+    cairo_pop_group_to_source(mContext);
+  } else {
+    cairo_new_path(mContext);
+    cairo_rectangle(mContext, 0, 0, aDest.Width(), aDest.Height());
+    cairo_clip(mContext);
+    cairo_set_source(mContext, pat);
+  }
+
+  PaintWithAlpha(mContext, aOptions);
+
+  cairo_pattern_destroy(pat);
+}
+
+void DrawTargetCairo::DrawFilter(FilterNode* aNode, const Rect& aSourceRect,
+                                 const Point& aDestPoint,
+                                 const DrawOptions& aOptions) {
+  FilterNodeSoftware* filter = static_cast<FilterNodeSoftware*>(aNode);
+  filter->Draw(this, aSourceRect, aDestPoint, aOptions);
+}
+
+void DrawTargetCairo::DrawSurfaceWithShadow(SourceSurface* aSurface,
+                                            const Point& aDest,
+                                            const ShadowOptions& aShadow,
+                                            CompositionOp aOperator) {
+  if (!IsValid() || !aSurface) {
+    gfxCriticalNote << "DrawSurfaceWithShadow with bad surface "
+                    << cairo_surface_status(cairo_get_group_target(mContext));
+    return;
+  }
+
+  if (aSurface->GetType() != SurfaceType::CAIRO) {
+    return;
+  }
+
+  AutoClearDeviceOffset clear(aSurface);
+
+  Float width = Float(aSurface->GetSize().width);
+  Float height = Float(aSurface->GetSize().height);
+
+  SourceSurfaceCairo* source = static_cast<SourceSurfaceCairo*>(aSurface);
+  cairo_surface_t* sourcesurf = source->GetSurface();
+  cairo_surface_t* blursurf;
+  cairo_surface_t* surf;
+
+  // We only use the A8 surface for blurred shadows. Unblurred shadows can just
+  // use the RGBA surface directly.
+  if (cairo_surface_get_type(sourcesurf) == CAIRO_SURFACE_TYPE_TEE) {
+    blursurf = cairo_tee_surface_index(sourcesurf, 0);
+    surf = cairo_tee_surface_index(sourcesurf, 1);
+  } else {
+    blursurf = sourcesurf;
+    surf = sourcesurf;
+  }
+
+  if (aShadow.mSigma != 0.0f) {
+    MOZ_ASSERT(cairo_surface_get_type(blursurf) == CAIRO_SURFACE_TYPE_IMAGE);
+    Rect extents(0, 0, width, height);
+    AlphaBoxBlur blur(extents, cairo_image_surface_get_stride(blursurf),
+                      aShadow.mSigma, aShadow.mSigma);
+    blur.Blur(cairo_image_surface_get_data(blursurf));
+  }
+
+  WillChange();
+  ClearSurfaceForUnboundedSource(aOperator);
+
+  cairo_save(mContext);
+  cairo_set_operator(mContext, GfxOpToCairoOp(aOperator));
+  cairo_identity_matrix(mContext);
+  cairo_translate(mContext, aDest.x, aDest.y);
+
+  bool needsGroup = !IsOperatorBoundByMask(aOperator);
+  if (needsGroup) {
+    cairo_push_group(mContext);
+  }
+
+  cairo_set_source_rgba(mContext, aShadow.mColor.r, aShadow.mColor.g,
+                        aShadow.mColor.b, aShadow.mColor.a);
+  cairo_mask_surface(mContext, blursurf, aShadow.mOffset.x, aShadow.mOffset.y);
+
+  if (blursurf != surf || aSurface->GetFormat() != SurfaceFormat::A8) {
+    // Now that the shadow has been drawn, we can draw the surface on top.
+    cairo_set_source_surface(mContext, surf, 0, 0);
+    cairo_new_path(mContext);
+    cairo_rectangle(mContext, 0, 0, width, height);
+    cairo_fill(mContext);
+  }
+
+  if (needsGroup) {
+    cairo_pop_group_to_source(mContext);
+    cairo_paint(mContext);
+  }
+
+  cairo_restore(mContext);
+}
+
+void DrawTargetCairo::DrawPattern(const Pattern& aPattern,
+                                  const StrokeOptions& aStrokeOptions,
+                                  const DrawOptions& aOptions,
+                                  DrawPatternType aDrawType,
+                                  bool aPathBoundsClip) {
+  if (!PatternIsCompatible(aPattern)) {
+    return;
+  }
+
+  AutoClearDeviceOffset clear(aPattern);
+
+  cairo_pattern_t* pat =
+      GfxPatternToCairoPattern(aPattern, aOptions.mAlpha, GetTransform());
+  if (!pat) {
+    return;
+  }
+  if (cairo_pattern_status(pat)) {
+    cairo_pattern_destroy(pat);
+    gfxWarning() << "Invalid pattern";
+    return;
+  }
+
+  cairo_set_source(mContext, pat);
+
+  cairo_set_antialias(mContext,
+                      GfxAntialiasToCairoAntialias(aOptions.mAntialiasMode));
+
+  if (NeedIntermediateSurface(aPattern, aOptions) ||
+      (!IsOperatorBoundByMask(aOptions.mCompositionOp) && !aPathBoundsClip)) {
+    cairo_push_group_with_content(mContext, CAIRO_CONTENT_COLOR_ALPHA);
+
+    // Don't want operators to be applied twice
+    cairo_set_operator(mContext, CAIRO_OPERATOR_OVER);
+
+    if (aDrawType == DRAW_STROKE) {
+      SetCairoStrokeOptions(mContext, aStrokeOptions);
+      cairo_stroke_preserve(mContext);
+    } else {
+      cairo_fill_preserve(mContext);
+    }
+
+    cairo_pop_group_to_source(mContext);
+
+    // Now draw the content using the desired operator
+    PaintWithAlpha(mContext, aOptions);
+  } else {
+    cairo_set_operator(mContext, GfxOpToCairoOp(aOptions.mCompositionOp));
+
+    if (aDrawType == DRAW_STROKE) {
+      SetCairoStrokeOptions(mContext, aStrokeOptions);
+      cairo_stroke_preserve(mContext);
+    } else {
+      cairo_fill_preserve(mContext);
+    }
+  }
+
+  cairo_pattern_destroy(pat);
+}
+
+void DrawTargetCairo::FillRect(const Rect& aRect, const Pattern& aPattern,
+                               const DrawOptions& aOptions) {
+  if (mTransformSingular) {
+    return;
+  }
+
+  AutoPrepareForDrawing prep(this, mContext);
+
+  bool restoreTransform = false;
+  Matrix mat;
+  Rect r = aRect;
+
+  /* Clamp coordinates to work around a design bug in cairo */
+  if (r.Width() > CAIRO_COORD_MAX || r.Height() > CAIRO_COORD_MAX ||
+      r.X() < -CAIRO_COORD_MAX || r.X() > CAIRO_COORD_MAX ||
+      r.Y() < -CAIRO_COORD_MAX || r.Y() > CAIRO_COORD_MAX) {
+    if (!mat.IsRectilinear()) {
+      gfxWarning() << "DrawTargetCairo::FillRect() misdrawing huge Rect "
+                      "with non-rectilinear transform";
+    }
+
+    mat = GetTransform();
+    r = mat.TransformBounds(r);
+
+    if (!ConditionRect(r)) {
+      gfxWarning() << "Ignoring DrawTargetCairo::FillRect() call with "
+                      "out-of-bounds Rect";
+      return;
+    }
+
+    restoreTransform = true;
+    SetTransform(Matrix());
+  }
+
+  cairo_new_path(mContext);
+  cairo_rectangle(mContext, r.X(), r.Y(), r.Width(), r.Height());
+
+  bool pathBoundsClip = false;
+
+  if (r.Contains(GetUserSpaceClip())) {
+    pathBoundsClip = true;
+  }
+
+  DrawPattern(aPattern, StrokeOptions(), aOptions, DRAW_FILL, pathBoundsClip);
+
+  if (restoreTransform) {
+    SetTransform(mat);
+  }
+}
+
+void DrawTargetCairo::CopySurfaceInternal(cairo_surface_t* aSurface,
+                                          const IntRect& aSource,
+                                          const IntPoint& aDest) {
+  if (cairo_surface_status(aSurface)) {
+    gfxWarning() << "Invalid surface" << cairo_surface_status(aSurface);
+    return;
+  }
+
+  cairo_identity_matrix(mContext);
+
+  cairo_set_source_surface(mContext, aSurface, aDest.x - aSource.X(),
+                           aDest.y - aSource.Y());
+  cairo_set_operator(mContext, CAIRO_OPERATOR_SOURCE);
+  cairo_set_antialias(mContext, CAIRO_ANTIALIAS_NONE);
+
+  cairo_reset_clip(mContext);
+  cairo_new_path(mContext);
+  cairo_rectangle(mContext, aDest.x, aDest.y, aSource.Width(),
+                  aSource.Height());
+  cairo_fill(mContext);
+}
+
+void DrawTargetCairo::CopySurface(SourceSurface* aSurface,
+                                  const IntRect& aSource,
+                                  const IntPoint& aDest) {
+  if (mTransformSingular) {
+    return;
+  }
+
+  AutoPrepareForDrawing prep(this, mContext);
+  AutoClearDeviceOffset clear(aSurface);
+
+  if (!aSurface) {
+    gfxWarning() << "Unsupported surface type specified";
+    return;
+  }
+
+  cairo_surface_t* surf = GetCairoSurfaceForSourceSurface(aSurface);
+  if (!surf) {
+    gfxWarning() << "Unsupported surface type specified";
+    return;
+  }
+
+  CopySurfaceInternal(surf, aSource, aDest);
+  cairo_surface_destroy(surf);
+}
+
+void DrawTargetCairo::CopyRect(const IntRect& aSource, const IntPoint& aDest) {
+  if (mTransformSingular) {
+    return;
+  }
+
+  AutoPrepareForDrawing prep(this, mContext);
+
+  IntRect source = aSource;
+  cairo_surface_t* surf = mSurface;
+
+  if (!SupportsSelfCopy(mSurface) && aSource.ContainsY(aDest.y)) {
+    cairo_surface_t* similar = cairo_surface_create_similar(
+        mSurface, GfxFormatToCairoContent(GetFormat()), aSource.Width(),
+        aSource.Height());
+    cairo_t* ctx = cairo_create(similar);
+    cairo_set_operator(ctx, CAIRO_OPERATOR_SOURCE);
+    cairo_set_source_surface(ctx, surf, -aSource.X(), -aSource.Y());
+    cairo_paint(ctx);
+    cairo_destroy(ctx);
+
+    source.MoveTo(0, 0);
+    surf = similar;
+  }
+
+  CopySurfaceInternal(surf, source, aDest);
+
+  if (surf != mSurface) {
+    cairo_surface_destroy(surf);
+  }
+}
+
+void DrawTargetCairo::ClearRect(const Rect& aRect) {
+  if (mTransformSingular) {
+    return;
+  }
+
+  AutoPrepareForDrawing prep(this, mContext);
+
+  if (!mContext || aRect.Width() < 0 || aRect.Height() < 0 ||
+      !std::isfinite(aRect.X()) || !std::isfinite(aRect.Width()) ||
+      !std::isfinite(aRect.Y()) || !std::isfinite(aRect.Height())) {
+    gfxCriticalNote << "ClearRect with invalid argument " << gfx::hexa(mContext)
+                    << " with " << aRect.Width() << "x" << aRect.Height()
+                    << " [" << aRect.X() << ", " << aRect.Y() << "]";
+  }
+
+  cairo_set_antialias(mContext, CAIRO_ANTIALIAS_NONE);
+  cairo_new_path(mContext);
+  cairo_set_operator(mContext, CAIRO_OPERATOR_CLEAR);
+  cairo_rectangle(mContext, aRect.X(), aRect.Y(), aRect.Width(),
+                  aRect.Height());
+  cairo_fill(mContext);
+}
+
+void DrawTargetCairo::StrokeRect(
+    const Rect& aRect, const Pattern& aPattern,
+    const StrokeOptions& aStrokeOptions /* = StrokeOptions() */,
+    const DrawOptions& aOptions /* = DrawOptions() */) {
+  if (mTransformSingular) {
+    return;
+  }
+
+  AutoPrepareForDrawing prep(this, mContext);
+
+  cairo_new_path(mContext);
+  cairo_rectangle(mContext, aRect.X(), aRect.Y(), aRect.Width(),
+                  aRect.Height());
+
+  DrawPattern(aPattern, aStrokeOptions, aOptions, DRAW_STROKE);
+}
+
+void DrawTargetCairo::StrokeLine(
+    const Point& aStart, const Point& aEnd, const Pattern& aPattern,
+    const StrokeOptions& aStrokeOptions /* = StrokeOptions() */,
+    const DrawOptions& aOptions /* = DrawOptions() */) {
+  if (mTransformSingular) {
+    return;
+  }
+
+  AutoPrepareForDrawing prep(this, mContext);
+
+  cairo_new_path(mContext);
+  cairo_move_to(mContext, aStart.x, aStart.y);
+  cairo_line_to(mContext, aEnd.x, aEnd.y);
+
+  DrawPattern(aPattern, aStrokeOptions, aOptions, DRAW_STROKE);
+}
+
+void DrawTargetCairo::Stroke(
+    const Path* aPath, const Pattern& aPattern,
+    const StrokeOptions& aStrokeOptions /* = StrokeOptions() */,
+    const DrawOptions& aOptions /* = DrawOptions() */) {
+  if (mTransformSingular) {
+    return;
+  }
+
+  AutoPrepareForDrawing prep(this, mContext, aPath);
+
+  if (aPath->GetBackendType() != BackendType::CAIRO) return;
+
+  PathCairo* path =
+      const_cast<PathCairo*>(static_cast<const PathCairo*>(aPath));
+  path->SetPathOnContext(mContext);
+
+  DrawPattern(aPattern, aStrokeOptions, aOptions, DRAW_STROKE);
+}
+
+void DrawTargetCairo::Fill(const Path* aPath, const Pattern& aPattern,
+                           const DrawOptions& aOptions /* = DrawOptions() */) {
+  if (mTransformSingular) {
+    return;
+  }
+
+  AutoPrepareForDrawing prep(this, mContext, aPath);
+
+  if (aPath->GetBackendType() != BackendType::CAIRO) return;
+
+  PathCairo* path =
+      const_cast<PathCairo*>(static_cast<const PathCairo*>(aPath));
+  path->SetPathOnContext(mContext);
+
+  DrawPattern(aPattern, StrokeOptions(), aOptions, DRAW_FILL);
+}
+
+bool DrawTargetCairo::IsCurrentGroupOpaque() {
+  cairo_surface_t* surf = cairo_get_group_target(mContext);
+
+  if (!surf) {
+    return false;
+  }
+
+  return cairo_surface_get_content(surf) == CAIRO_CONTENT_COLOR;
+}
+
+void DrawTargetCairo::SetFontOptions(cairo_antialias_t aAAMode) {
+  //   This will attempt to detect if the currently set scaled font on the
+  // context has enabled subpixel AA. If it is not permitted, then it will
+  // downgrade to grayscale AA.
+  //   This only currently works effectively for the cairo-ft backend relative
+  // to system defaults, as only cairo-ft reflect system defaults in the scaled
+  // font state. However, this will work for cairo-ft on both tree Cairo and
+  // system Cairo.
+  //   Other backends leave the CAIRO_ANTIALIAS_DEFAULT setting untouched while
+  // potentially interpreting it as subpixel or even other types of AA that
+  // can't be safely equivocated with grayscale AA. For this reason we don't
+  // try to also detect and modify the default AA setting, only explicit
+  // subpixel AA. These other backends must instead rely on tree Cairo's
+  // cairo_surface_set_subpixel_antialiasing extension.
+
+  // If allowing subpixel AA, then leave Cairo's default AA state.
+  if (mPermitSubpixelAA && aAAMode == CAIRO_ANTIALIAS_DEFAULT) {
+    return;
+  }
+
+  if (!mFontOptions) {
+    mFontOptions = cairo_font_options_create();
+    if (!mFontOptions) {
+      gfxWarning() << "Failed allocating Cairo font options";
+      return;
+    }
+  }
+
+  cairo_get_font_options(mContext, mFontOptions);
+  cairo_antialias_t oldAA = cairo_font_options_get_antialias(mFontOptions);
+  cairo_antialias_t newAA =
+      aAAMode == CAIRO_ANTIALIAS_DEFAULT ? oldAA : aAAMode;
+  // Nothing to change if switching to default AA.
+  if (newAA == CAIRO_ANTIALIAS_DEFAULT) {
+    return;
+  }
+  // If the current font requests subpixel AA, force it to gray since we don't
+  // allow subpixel AA.
+  if (!mPermitSubpixelAA && newAA == CAIRO_ANTIALIAS_SUBPIXEL) {
+    newAA = CAIRO_ANTIALIAS_GRAY;
+  }
+  // Only override old AA with lower levels of AA.
+  if (oldAA == CAIRO_ANTIALIAS_DEFAULT || (int)newAA < (int)oldAA) {
+    cairo_font_options_set_antialias(mFontOptions, newAA);
+    cairo_set_font_options(mContext, mFontOptions);
+  }
+}
+
+void DrawTargetCairo::SetPermitSubpixelAA(bool aPermitSubpixelAA) {
+  DrawTarget::SetPermitSubpixelAA(aPermitSubpixelAA);
+  cairo_surface_set_subpixel_antialiasing(
+      cairo_get_group_target(mContext),
+      aPermitSubpixelAA ? CAIRO_SUBPIXEL_ANTIALIASING_ENABLED
+                        : CAIRO_SUBPIXEL_ANTIALIASING_DISABLED);
+}
+
+static bool SupportsVariationSettings(cairo_surface_t* surface) {
+  switch (cairo_surface_get_type(surface)) {
+    case CAIRO_SURFACE_TYPE_PDF:
+    case CAIRO_SURFACE_TYPE_PS:
+      return false;
+    default:
+      return true;
+  }
+}
+
+void DrawTargetCairo::FillGlyphs(ScaledFont* aFont, const GlyphBuffer& aBuffer,
+                                 const Pattern& aPattern,
+                                 const DrawOptions& aOptions) {
+  if (mTransformSingular) {
+    return;
+  }
+
+  if (!IsValid()) {
+    gfxDebug() << "FillGlyphs bad surface "
+               << cairo_surface_status(cairo_get_group_target(mContext));
+    return;
+  }
+
+  cairo_scaled_font_t* cairoScaledFont =
+      aFont ? aFont->GetCairoScaledFont() : nullptr;
+  if (!cairoScaledFont) {
+    gfxDevCrash(LogReason::InvalidFont) << "Invalid scaled font";
+    return;
+  }
+
+  AutoPrepareForDrawing prep(this, mContext);
+  AutoClearDeviceOffset clear(aPattern);
+
+  cairo_set_scaled_font(mContext, cairoScaledFont);
+
+  cairo_pattern_t* pat =
+      GfxPatternToCairoPattern(aPattern, aOptions.mAlpha, GetTransform());
+  if (!pat) return;
+
+  cairo_set_source(mContext, pat);
+  cairo_pattern_destroy(pat);
+
+  cairo_antialias_t aa = GfxAntialiasToCairoAntialias(aOptions.mAntialiasMode);
+  cairo_set_antialias(mContext, aa);
+
+  // Override any font-specific options as necessary.
+  SetFontOptions(aa);
+
+  // Convert our GlyphBuffer into a vector of Cairo glyphs. This code can
+  // execute millions of times in short periods, so we want to avoid heap
+  // allocation whenever possible. So we use an inline vector capacity of 1024
+  // bytes (the maximum allowed by mozilla::Vector), which gives an inline
+  // length of 1024 / 24 = 42 elements, which is enough to typically avoid heap
+  // allocation in ~99% of cases.
+  Vector<cairo_glyph_t, 1024 / sizeof(cairo_glyph_t)> glyphs;
+  if (!glyphs.resizeUninitialized(aBuffer.mNumGlyphs)) {
+    gfxDevCrash(LogReason::GlyphAllocFailedCairo) << "glyphs allocation failed";
+    return;
+  }
+  for (uint32_t i = 0; i < aBuffer.mNumGlyphs; ++i) {
+    glyphs[i].index = aBuffer.mGlyphs[i].mIndex;
+    glyphs[i].x = aBuffer.mGlyphs[i].mPosition.x;
+    glyphs[i].y = aBuffer.mGlyphs[i].mPosition.y;
+  }
+
+  if (!SupportsVariationSettings(mSurface) && aFont->HasVariationSettings() &&
+      StaticPrefs::print_font_variations_as_paths()) {
+    cairo_set_fill_rule(mContext, CAIRO_FILL_RULE_WINDING);
+    cairo_new_path(mContext);
+    cairo_glyph_path(mContext, &glyphs[0], aBuffer.mNumGlyphs);
+    cairo_set_operator(mContext, CAIRO_OPERATOR_OVER);
+    cairo_fill(mContext);
+  } else {
+    cairo_show_glyphs(mContext, &glyphs[0], aBuffer.mNumGlyphs);
+  }
+
+  if (cairo_surface_status(cairo_get_group_target(mContext))) {
+    gfxDebug() << "Ending FillGlyphs with a bad surface "
+               << cairo_surface_status(cairo_get_group_target(mContext));
+  }
+}
+
+void DrawTargetCairo::Mask(const Pattern& aSource, const Pattern& aMask,
+                           const DrawOptions& aOptions /* = DrawOptions() */) {
+  if (mTransformSingular) {
+    return;
+  }
+
+  AutoPrepareForDrawing prep(this, mContext);
+  AutoClearDeviceOffset clearSource(aSource);
+  AutoClearDeviceOffset clearMask(aMask);
+
+  cairo_set_antialias(mContext,
+                      GfxAntialiasToCairoAntialias(aOptions.mAntialiasMode));
+
+  cairo_pattern_t* source =
+      GfxPatternToCairoPattern(aSource, aOptions.mAlpha, GetTransform());
+  if (!source) {
+    return;
+  }
+
+  cairo_pattern_t* mask =
+      GfxPatternToCairoPattern(aMask, aOptions.mAlpha, GetTransform());
+  if (!mask) {
+    cairo_pattern_destroy(source);
+    return;
+  }
+
+  if (cairo_pattern_status(source) || cairo_pattern_status(mask)) {
+    cairo_pattern_destroy(source);
+    cairo_pattern_destroy(mask);
+    gfxWarning() << "Invalid pattern";
+    return;
+  }
+
+  cairo_set_source(mContext, source);
+  cairo_set_operator(mContext, GfxOpToCairoOp(aOptions.mCompositionOp));
+  cairo_mask(mContext, mask);
+
+  cairo_pattern_destroy(mask);
+  cairo_pattern_destroy(source);
+}
+
+void DrawTargetCairo::MaskSurface(const Pattern& aSource, SourceSurface* aMask,
+                                  Point aOffset, const DrawOptions& aOptions) {
+  if (mTransformSingular) {
+    return;
+  }
+
+  AutoPrepareForDrawing prep(this, mContext);
+  AutoClearDeviceOffset clearSource(aSource);
+  AutoClearDeviceOffset clearMask(aMask);
+
+  if (!PatternIsCompatible(aSource)) {
+    return;
+  }
+
+  cairo_set_antialias(mContext,
+                      GfxAntialiasToCairoAntialias(aOptions.mAntialiasMode));
+
+  cairo_pattern_t* pat =
+      GfxPatternToCairoPattern(aSource, aOptions.mAlpha, GetTransform());
+  if (!pat) {
+    return;
+  }
+
+  if (cairo_pattern_status(pat)) {
+    cairo_pattern_destroy(pat);
+    gfxWarning() << "Invalid pattern";
+    return;
+  }
+
+  cairo_set_source(mContext, pat);
+
+  if (NeedIntermediateSurface(aSource, aOptions)) {
+    cairo_push_group_with_content(mContext, CAIRO_CONTENT_COLOR_ALPHA);
+
+    // Don't want operators to be applied twice
+    cairo_set_operator(mContext, CAIRO_OPERATOR_OVER);
+
+    // Now draw the content using the desired operator
+    cairo_paint_with_alpha(mContext, aOptions.mAlpha);
+
+    cairo_pop_group_to_source(mContext);
+  }
+
+  cairo_surface_t* surf = GetCairoSurfaceForSourceSurface(aMask);
+  if (!surf) {
+    cairo_pattern_destroy(pat);
+    return;
+  }
+  cairo_pattern_t* mask = cairo_pattern_create_for_surface(surf);
+  cairo_matrix_t matrix;
+
+  cairo_matrix_init_translate(&matrix, -aOffset.x - aMask->GetRect().x,
+                              -aOffset.y - aMask->GetRect().y);
+  cairo_pattern_set_matrix(mask, &matrix);
+
+  cairo_set_operator(mContext, GfxOpToCairoOp(aOptions.mCompositionOp));
+
+  cairo_mask(mContext, mask);
+
+  cairo_surface_destroy(surf);
+  cairo_pattern_destroy(mask);
+  cairo_pattern_destroy(pat);
+}
+
+void DrawTargetCairo::PushClip(const Path* aPath) {
+  if (aPath->GetBackendType() != BackendType::CAIRO) {
+    return;
+  }
+
+  WillChange(aPath);
+  cairo_save(mContext);
+
+  PathCairo* path =
+      const_cast<PathCairo*>(static_cast<const PathCairo*>(aPath));
+
+  if (mTransformSingular) {
+    cairo_new_path(mContext);
+    cairo_rectangle(mContext, 0, 0, 0, 0);
+  } else {
+    path->SetPathOnContext(mContext);
+  }
+  cairo_clip_preserve(mContext);
+}
+
+void DrawTargetCairo::PushClipRect(const Rect& aRect) {
+  WillChange();
+  cairo_save(mContext);
+
+  cairo_new_path(mContext);
+  if (mTransformSingular) {
+    cairo_rectangle(mContext, 0, 0, 0, 0);
+  } else {
+    cairo_rectangle(mContext, aRect.X(), aRect.Y(), aRect.Width(),
+                    aRect.Height());
+  }
+  cairo_clip_preserve(mContext);
+}
+
+void DrawTargetCairo::PopClip() {
+  // save/restore does not affect the path, so no need to call WillChange()
+
+  // cairo_restore will restore the transform too and we don't want to do that
+  // so we'll save it now and restore it after the cairo_restore
+  cairo_matrix_t mat;
+  cairo_get_matrix(mContext, &mat);
+
+  cairo_restore(mContext);
+
+  cairo_set_matrix(mContext, &mat);
+}
+
+void DrawTargetCairo::PushLayer(bool aOpaque, Float aOpacity,
+                                SourceSurface* aMask,
+                                const Matrix& aMaskTransform,
+                                const IntRect& aBounds, bool aCopyBackground) {
+  PushLayerWithBlend(aOpaque, aOpacity, aMask, aMaskTransform, aBounds,
+                     aCopyBackground, CompositionOp::OP_OVER);
+}
+
+void DrawTargetCairo::PushLayerWithBlend(bool aOpaque, Float aOpacity,
+                                         SourceSurface* aMask,
+                                         const Matrix& aMaskTransform,
+                                         const IntRect& aBounds,
+                                         bool aCopyBackground,
+                                         CompositionOp aCompositionOp) {
+  cairo_content_t content = CAIRO_CONTENT_COLOR_ALPHA;
+
+  if (mFormat == SurfaceFormat::A8) {
+    content = CAIRO_CONTENT_ALPHA;
+  } else if (aOpaque) {
+    content = CAIRO_CONTENT_COLOR;
+  }
+
+  if (aCopyBackground) {
+    cairo_surface_t* source = cairo_get_group_target(mContext);
+    cairo_push_group_with_content(mContext, content);
+    cairo_surface_t* dest = cairo_get_group_target(mContext);
+    cairo_t* ctx = cairo_create(dest);
+    cairo_set_source_surface(ctx, source, 0, 0);
+    cairo_set_operator(ctx, CAIRO_OPERATOR_SOURCE);
+    cairo_paint(ctx);
+    cairo_destroy(ctx);
+  } else {
+    cairo_push_group_with_content(mContext, content);
+  }
+
+  PushedLayer layer(aOpacity, aCompositionOp, mPermitSubpixelAA);
+
+  if (aMask) {
+    cairo_surface_t* surf = GetCairoSurfaceForSourceSurface(aMask);
+    if (surf) {
+      layer.mMaskPattern = cairo_pattern_create_for_surface(surf);
+      Matrix maskTransform = aMaskTransform;
+      maskTransform.PreTranslate(aMask->GetRect().X(), aMask->GetRect().Y());
+      cairo_matrix_t mat;
+      GfxMatrixToCairoMatrix(maskTransform, mat);
+      cairo_matrix_invert(&mat);
+      cairo_pattern_set_matrix(layer.mMaskPattern, &mat);
+      cairo_surface_destroy(surf);
+    } else {
+      gfxCriticalError() << "Failed to get cairo surface for mask surface!";
+    }
+  }
+
+  mPushedLayers.push_back(layer);
+
+  SetPermitSubpixelAA(aOpaque);
+}
+
+void DrawTargetCairo::PopLayer() {
+  MOZ_RELEASE_ASSERT(!mPushedLayers.empty());
+
+  cairo_set_operator(mContext, CAIRO_OPERATOR_OVER);
+
+  cairo_pop_group_to_source(mContext);
+
+  PushedLayer layer = mPushedLayers.back();
+  mPushedLayers.pop_back();
+
+  if (!layer.mMaskPattern) {
+    cairo_set_operator(mContext, GfxOpToCairoOp(layer.mCompositionOp));
+    cairo_paint_with_alpha(mContext, layer.mOpacity);
+  } else {
+    if (layer.mOpacity != Float(1.0)) {
+      cairo_push_group_with_content(mContext, CAIRO_CONTENT_COLOR_ALPHA);
+
+      // Now draw the content using the desired operator
+      cairo_paint_with_alpha(mContext, layer.mOpacity);
+
+      cairo_pop_group_to_source(mContext);
+    }
+    cairo_set_operator(mContext, GfxOpToCairoOp(layer.mCompositionOp));
+    cairo_mask(mContext, layer.mMaskPattern);
+  }
+
+  cairo_matrix_t mat;
+  GfxMatrixToCairoMatrix(mTransform, mat);
+  cairo_set_matrix(mContext, &mat);
+
+  cairo_set_operator(mContext, CAIRO_OPERATOR_OVER);
+
+  cairo_pattern_destroy(layer.mMaskPattern);
+  SetPermitSubpixelAA(layer.mWasPermittingSubpixelAA);
+}
+
+void DrawTargetCairo::ClearSurfaceForUnboundedSource(
+    const CompositionOp& aOperator) {
+  if (aOperator != CompositionOp::OP_SOURCE) return;
+  cairo_set_operator(mContext, CAIRO_OPERATOR_CLEAR);
+  // It doesn't really matter what the source is here, since Paint
+  // isn't bounded by the source and the mask covers the entire clip
+  // region.
+  cairo_paint(mContext);
+}
+
+already_AddRefed<GradientStops> DrawTargetCairo::CreateGradientStops(
+    GradientStop* aStops, uint32_t aNumStops, ExtendMode aExtendMode) const {
+  return MakeAndAddRef<GradientStopsCairo>(aStops, aNumStops, aExtendMode);
+}
+
+already_AddRefed<FilterNode> DrawTargetCairo::CreateFilter(FilterType aType) {
+  return FilterNodeSoftware::Create(aType);
+}
+
+already_AddRefed<SourceSurface> DrawTargetCairo::CreateSourceSurfaceFromData(
+    unsigned char* aData, const IntSize& aSize, int32_t aStride,
+    SurfaceFormat aFormat) const {
+  if (!aData) {
+    gfxWarning() << "DrawTargetCairo::CreateSourceSurfaceFromData null aData";
+    return nullptr;
+  }
+
+  cairo_surface_t* surf =
+      CopyToImageSurface(aData, IntRect(IntPoint(), aSize), aStride, aFormat);
+  if (!surf) {
+    return nullptr;
+  }
+
+  RefPtr<SourceSurfaceCairo> source_surf =
+      new SourceSurfaceCairo(surf, aSize, aFormat);
+  cairo_surface_destroy(surf);
+
+  return source_surf.forget();
+}
+
+already_AddRefed<SourceSurface> DrawTargetCairo::OptimizeSourceSurface(
+    SourceSurface* aSurface) const {
+  RefPtr<SourceSurface> surface(aSurface);
+  return surface.forget();
+}
+
+already_AddRefed<SourceSurface>
+DrawTargetCairo::CreateSourceSurfaceFromNativeSurface(
+    const NativeSurface& aSurface) const {
+  return nullptr;
+}
+
+already_AddRefed<DrawTarget> DrawTargetCairo::CreateSimilarDrawTarget(
+    const IntSize& aSize, SurfaceFormat aFormat) const {
+  if (cairo_surface_status(cairo_get_group_target(mContext))) {
+    RefPtr<DrawTargetCairo> target = new DrawTargetCairo();
+    if (target->Init(aSize, aFormat)) {
+      return target.forget();
+    }
+  }
+
+  cairo_surface_t* similar;
+  switch (cairo_surface_get_type(mSurface)) {
+#ifdef CAIRO_HAS_WIN32_SURFACE
+    case CAIRO_SURFACE_TYPE_WIN32:
+      similar = cairo_win32_surface_create_with_dib(
+          GfxFormatToCairoFormat(aFormat), aSize.width, aSize.height);
+      break;
+#endif
+#ifdef CAIRO_HAS_QUARTZ_SURFACE
+    case CAIRO_SURFACE_TYPE_QUARTZ:
+      if (StaticPrefs::gfx_cairo_quartz_cg_layer_enabled()) {
+        similar = cairo_quartz_surface_create_cg_layer(
+            mSurface, GfxFormatToCairoContent(aFormat), aSize.width,
+            aSize.height);
+        break;
+      }
+      [[fallthrough]];
+#endif
+    default:
+      similar = cairo_surface_create_similar(mSurface,
+                                             GfxFormatToCairoContent(aFormat),
+                                             aSize.width, aSize.height);
+      break;
+  }
+
+  if (!cairo_surface_status(similar)) {
+    RefPtr<DrawTargetCairo> target = new DrawTargetCairo();
+    if (target->InitAlreadyReferenced(similar, aSize)) {
+      return target.forget();
+    }
+  }
+
+  gfxCriticalError(
+      CriticalLog::DefaultOptions(Factory::ReasonableSurfaceSize(aSize)))
+      << "Failed to create similar cairo surface! Size: " << aSize
+      << " Status: " << cairo_surface_status(similar)
+      << cairo_surface_status(cairo_get_group_target(mContext)) << " format "
+      << (int)aFormat;
+  cairo_surface_destroy(similar);
+
+  return nullptr;
+}
+
+RefPtr<DrawTarget> DrawTargetCairo::CreateClippedDrawTarget(
+    const Rect& aBounds, SurfaceFormat aFormat) {
+  RefPtr<DrawTarget> result;
+  // Doing this save()/restore() dance is wasteful
+  cairo_save(mContext);
+
+  if (!aBounds.IsEmpty()) {
+    cairo_new_path(mContext);
+    cairo_rectangle(mContext, aBounds.X(), aBounds.Y(), aBounds.Width(),
+                    aBounds.Height());
+    cairo_clip(mContext);
+  }
+  cairo_identity_matrix(mContext);
+  IntRect clipBounds = IntRect::RoundOut(GetUserSpaceClip());
+  if (!clipBounds.IsEmpty()) {
+    RefPtr<DrawTarget> dt = CreateSimilarDrawTarget(
+        IntSize(clipBounds.width, clipBounds.height), aFormat);
+    result = gfx::Factory::CreateOffsetDrawTarget(
+        dt, IntPoint(clipBounds.x, clipBounds.y));
+    result->SetTransform(mTransform);
+  } else {
+    // Everything is clipped but we still want some kind of surface
+    result = CreateSimilarDrawTarget(IntSize(1, 1), aFormat);
+  }
+
+  cairo_restore(mContext);
+  return result;
+}
+bool DrawTargetCairo::InitAlreadyReferenced(cairo_surface_t* aSurface,
+                                            const IntSize& aSize,
+                                            SurfaceFormat* aFormat) {
+  if (cairo_surface_status(aSurface)) {
+    gfxCriticalNote << "Attempt to create DrawTarget for invalid surface. "
+                    << aSize
+                    << " Cairo Status: " << cairo_surface_status(aSurface);
+    cairo_surface_destroy(aSurface);
+    return false;
+  }
+
+  mContext = cairo_create(aSurface);
+  mSurface = aSurface;
+  mSize = aSize;
+  mFormat = aFormat ? *aFormat : GfxFormatForCairoSurface(aSurface);
+
+  // Cairo image surface have a bug where they will allocate a mask surface (for
+  // clipping) the size of the clip extents, and don't take the surface extents
+  // into account. Add a manual clip to the surface extents to prevent this.
+  cairo_new_path(mContext);
+  cairo_rectangle(mContext, 0, 0, mSize.width, mSize.height);
+  cairo_clip(mContext);
+
+  if (mFormat == SurfaceFormat::A8R8G8B8_UINT32 ||
+      mFormat == SurfaceFormat::R8G8B8A8) {
+    SetPermitSubpixelAA(false);
+  } else {
+    SetPermitSubpixelAA(true);
+  }
+
+  return true;
+}
+
+already_AddRefed<DrawTarget> DrawTargetCairo::CreateShadowDrawTarget(
+    const IntSize& aSize, SurfaceFormat aFormat, float aSigma) const {
+  cairo_surface_t* similar = cairo_surface_create_similar(
+      cairo_get_target(mContext), GfxFormatToCairoContent(aFormat), aSize.width,
+      aSize.height);
+
+  if (cairo_surface_status(similar)) {
+    return nullptr;
+  }
+
+  // If we don't have a blur then we can use the RGBA mask and keep all the
+  // operations in graphics memory.
+  if (aSigma == 0.0f || aFormat == SurfaceFormat::A8) {
+    RefPtr<DrawTargetCairo> target = new DrawTargetCairo();
+    if (target->InitAlreadyReferenced(similar, aSize)) {
+      return target.forget();
+    } else {
+      return nullptr;
+    }
+  }
+
+  cairo_surface_t* blursurf =
+      cairo_image_surface_create(CAIRO_FORMAT_A8, aSize.width, aSize.height);
+
+  if (cairo_surface_status(blursurf)) {
+    return nullptr;
+  }
+
+  cairo_surface_t* tee = cairo_tee_surface_create(blursurf);
+  cairo_surface_destroy(blursurf);
+  if (cairo_surface_status(tee)) {
+    cairo_surface_destroy(similar);
+    return nullptr;
+  }
+
+  cairo_tee_surface_add(tee, similar);
+  cairo_surface_destroy(similar);
+
+  RefPtr<DrawTargetCairo> target = new DrawTargetCairo();
+  if (target->InitAlreadyReferenced(tee, aSize)) {
+    return target.forget();
+  }
+  return nullptr;
+}
+
+bool DrawTargetCairo::Draw3DTransformedSurface(SourceSurface* aSurface,
+                                               const Matrix4x4& aMatrix) {
+  return DrawTarget::Draw3DTransformedSurface(aSurface, aMatrix);
+}
+
+bool DrawTargetCairo::Init(cairo_surface_t* aSurface, const IntSize& aSize,
+                           SurfaceFormat* aFormat) {
+  cairo_surface_reference(aSurface);
+  return InitAlreadyReferenced(aSurface, aSize, aFormat);
+}
+
+bool DrawTargetCairo::Init(const IntSize& aSize, SurfaceFormat aFormat) {
+  cairo_surface_t* surf = cairo_image_surface_create(
+      GfxFormatToCairoFormat(aFormat), aSize.width, aSize.height);
+  return InitAlreadyReferenced(surf, aSize);
+}
+
+bool DrawTargetCairo::Init(unsigned char* aData, const IntSize& aSize,
+                           int32_t aStride, SurfaceFormat aFormat) {
+  cairo_surface_t* surf = cairo_image_surface_create_for_data(
+      aData, GfxFormatToCairoFormat(aFormat), aSize.width, aSize.height,
+      aStride);
+  return InitAlreadyReferenced(surf, aSize);
+}
+
+void* DrawTargetCairo::GetNativeSurface(NativeSurfaceType aType) {
+  if (aType == NativeSurfaceType::CAIRO_CONTEXT) {
+    return mContext;
+  }
+
+  return nullptr;
+}
+
+void DrawTargetCairo::MarkSnapshotIndependent() {
+  if (mSnapshot) {
+    if (mSnapshot->refCount() > 1) {
+      // We only need to worry about snapshots that someone else knows about
+      mSnapshot->DrawTargetWillChange();
+    }
+    mSnapshot = nullptr;
+  }
+}
+
+void DrawTargetCairo::WillChange(const Path* aPath /* = nullptr */) {
+  MarkSnapshotIndependent();
+  MOZ_ASSERT(!mLockedBits);
+}
+
+void DrawTargetCairo::SetTransform(const Matrix& aTransform) {
+  DrawTarget::SetTransform(aTransform);
+
+  mTransformSingular = aTransform.IsSingular();
+  if (!mTransformSingular) {
+    cairo_matrix_t mat;
+    GfxMatrixToCairoMatrix(mTransform, mat);
+    cairo_set_matrix(mContext, &mat);
+  }
+}
+
+Rect DrawTargetCairo::GetUserSpaceClip() const {
+  double clipX1, clipY1, clipX2, clipY2;
+  cairo_clip_extents(mContext, &clipX1, &clipY1, &clipX2, &clipY2);
+  return Rect(clipX1, clipY1, clipX2 - clipX1,
+              clipY2 - clipY1);  // Narrowing of doubles to floats
+}
+
+#ifdef MOZ_X11
+bool BorrowedXlibDrawable::Init(DrawTarget* aDT) {
+  MOZ_ASSERT(aDT, "Caller should check for nullptr");
+  MOZ_ASSERT(!mDT, "Can't initialize twice!");
+  mDT = aDT;
+  mDrawable = X11None;
+
+#  ifdef CAIRO_HAS_XLIB_SURFACE
+  if (aDT->GetBackendType() != BackendType::CAIRO || aDT->IsTiledDrawTarget()) {
+    return false;
+  }
+
+  DrawTargetCairo* cairoDT = static_cast<DrawTargetCairo*>(aDT);
+  cairo_surface_t* surf = cairo_get_group_target(cairoDT->mContext);
+  if (cairo_surface_get_type(surf) != CAIRO_SURFACE_TYPE_XLIB) {
+    return false;
+  }
+  cairo_surface_flush(surf);
+
+  cairoDT->WillChange();
+
+  mDisplay = cairo_xlib_surface_get_display(surf);
+  mDrawable = cairo_xlib_surface_get_drawable(surf);
+  mScreen = cairo_xlib_surface_get_screen(surf);
+  mVisual = cairo_xlib_surface_get_visual(surf);
+  mSize.width = cairo_xlib_surface_get_width(surf);
+  mSize.height = cairo_xlib_surface_get_height(surf);
+
+  double x = 0, y = 0;
+  cairo_surface_get_device_offset(surf, &x, &y);
+  mOffset = Point(x, y);
+
+  return true;
+#  else
+  return false;
+#  endif
+}
+
+void BorrowedXlibDrawable::Finish() {
+  DrawTargetCairo* cairoDT = static_cast<DrawTargetCairo*>(mDT);
+  cairo_surface_t* surf = cairo_get_group_target(cairoDT->mContext);
+  cairo_surface_mark_dirty(surf);
+  if (mDrawable) {
+    mDrawable = X11None;
+  }
+}
+#endif
+
+}  // namespace gfx
+}  // namespace mozilla