Adding upstream version 124.0.1.upstream/124.0.1

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

1 files changed, 1369 insertions, 0 deletions

diff --git a/widget/gtk/nsNativeThemeGTK.cpp b/widget/gtk/nsNativeThemeGTK.cpp
new file mode 100644
index 0000000000..06d9b48007
--- /dev/null
+++ b/widget/gtk/nsNativeThemeGTK.cpp
@@ -0,0 +1,1369 @@
+/* -*- Mode: C++; tab-width: 2; 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/. */
+
+#include "nsNativeThemeGTK.h"
+#include "nsPresContext.h"
+#include "nsStyleConsts.h"
+#include "gtkdrawing.h"
+#include "ScreenHelperGTK.h"
+#include "WidgetUtilsGtk.h"
+
+#include "gfx2DGlue.h"
+#include "nsIObserverService.h"
+#include "nsIFrame.h"
+#include "nsIContent.h"
+#include "nsViewManager.h"
+#include "nsNameSpaceManager.h"
+#include "nsGfxCIID.h"
+#include "nsTransform2D.h"
+#include "nsXULPopupManager.h"
+#include "tree/nsTreeBodyFrame.h"
+#include "prlink.h"
+#include "nsGkAtoms.h"
+#include "nsAttrValueInlines.h"
+
+#include "mozilla/dom/HTMLInputElement.h"
+#include "mozilla/ClearOnShutdown.h"
+#include "mozilla/Services.h"
+
+#include <gdk/gdkprivate.h>
+#include <gtk/gtk.h>
+
+#include "gfxContext.h"
+#include "mozilla/dom/XULButtonElement.h"
+#include "mozilla/gfx/BorrowedContext.h"
+#include "mozilla/gfx/HelpersCairo.h"
+#include "mozilla/gfx/PathHelpers.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/PresShell.h"
+#include "mozilla/layers/StackingContextHelper.h"
+#include "mozilla/StaticPrefs_layout.h"
+#include "mozilla/StaticPrefs_widget.h"
+#include "nsWindow.h"
+#include "nsLayoutUtils.h"
+#include "Theme.h"
+
+#ifdef MOZ_X11
+#  ifdef CAIRO_HAS_XLIB_SURFACE
+#    include "cairo-xlib.h"
+#  endif
+#endif
+
+#include <algorithm>
+#include <dlfcn.h>
+
+using namespace mozilla;
+using namespace mozilla::gfx;
+using namespace mozilla::widget;
+
+static int gLastGdkError;
+
+// Return widget scale factor of the monitor where the window is located by the
+// most part. We intentionally honor the text scale factor here in order to
+// have consistent scaling with other UI elements.
+static inline CSSToLayoutDeviceScale GetWidgetScaleFactor(nsIFrame* aFrame) {
+  return aFrame->PresContext()->CSSToDevPixelScale();
+}
+
+nsNativeThemeGTK::nsNativeThemeGTK() : Theme(ScrollbarStyle()) {
+  if (moz_gtk_init() != MOZ_GTK_SUCCESS) {
+    memset(mDisabledWidgetTypes, 0xff, sizeof(mDisabledWidgetTypes));
+    return;
+  }
+
+  ThemeChanged();
+}
+
+nsNativeThemeGTK::~nsNativeThemeGTK() { moz_gtk_shutdown(); }
+
+void nsNativeThemeGTK::RefreshWidgetWindow(nsIFrame* aFrame) {
+  MOZ_ASSERT(aFrame);
+  MOZ_ASSERT(aFrame->PresShell());
+
+  nsViewManager* vm = aFrame->PresShell()->GetViewManager();
+  if (!vm) {
+    return;
+  }
+  vm->InvalidateAllViews();
+}
+
+static bool IsFrameContentNodeInNamespace(nsIFrame* aFrame,
+                                          uint32_t aNamespace) {
+  nsIContent* content = aFrame ? aFrame->GetContent() : nullptr;
+  if (!content) return false;
+  return content->IsInNamespace(aNamespace);
+}
+
+static bool IsWidgetTypeDisabled(const uint8_t* aDisabledVector,
+                                 StyleAppearance aAppearance) {
+  auto type = static_cast<size_t>(aAppearance);
+  MOZ_ASSERT(type < static_cast<size_t>(StyleAppearance::Count));
+  return (aDisabledVector[type >> 3] & (1 << (type & 7))) != 0;
+}
+
+static void SetWidgetTypeDisabled(uint8_t* aDisabledVector,
+                                  StyleAppearance aAppearance) {
+  auto type = static_cast<size_t>(aAppearance);
+  MOZ_ASSERT(type < static_cast<size_t>(mozilla::StyleAppearance::Count));
+  aDisabledVector[type >> 3] |= (1 << (type & 7));
+}
+
+static inline uint16_t GetWidgetStateKey(StyleAppearance aAppearance,
+                                         GtkWidgetState* aWidgetState) {
+  return (aWidgetState->active | aWidgetState->focused << 1 |
+          aWidgetState->inHover << 2 | aWidgetState->disabled << 3 |
+          aWidgetState->isDefault << 4 |
+          static_cast<uint16_t>(aAppearance) << 5);
+}
+
+static bool IsWidgetStateSafe(uint8_t* aSafeVector, StyleAppearance aAppearance,
+                              GtkWidgetState* aWidgetState) {
+  MOZ_ASSERT(static_cast<size_t>(aAppearance) <
+             static_cast<size_t>(mozilla::StyleAppearance::Count));
+  uint16_t key = GetWidgetStateKey(aAppearance, aWidgetState);
+  return (aSafeVector[key >> 3] & (1 << (key & 7))) != 0;
+}
+
+static void SetWidgetStateSafe(uint8_t* aSafeVector,
+                               StyleAppearance aAppearance,
+                               GtkWidgetState* aWidgetState) {
+  MOZ_ASSERT(static_cast<size_t>(aAppearance) <
+             static_cast<size_t>(mozilla::StyleAppearance::Count));
+  uint16_t key = GetWidgetStateKey(aAppearance, aWidgetState);
+  aSafeVector[key >> 3] |= (1 << (key & 7));
+}
+
+/* static */
+GtkTextDirection nsNativeThemeGTK::GetTextDirection(nsIFrame* aFrame) {
+  // IsFrameRTL() treats vertical-rl modes as right-to-left (in addition to
+  // horizontal text with direction=RTL), rather than just considering the
+  // text direction.  GtkTextDirection does not have distinct values for
+  // vertical writing modes, but considering the block flow direction is
+  // important for resizers and scrollbar elements, at least.
+  return IsFrameRTL(aFrame) ? GTK_TEXT_DIR_RTL : GTK_TEXT_DIR_LTR;
+}
+
+// Returns positive for negative margins (otherwise 0).
+gint nsNativeThemeGTK::GetTabMarginPixels(nsIFrame* aFrame) {
+  nscoord margin = IsBottomTab(aFrame) ? aFrame->GetUsedMargin().top
+                                       : aFrame->GetUsedMargin().bottom;
+
+  return std::min<gint>(
+      MOZ_GTK_TAB_MARGIN_MASK,
+      std::max(0, aFrame->PresContext()->AppUnitsToDevPixels(-margin)));
+}
+
+bool nsNativeThemeGTK::GetGtkWidgetAndState(StyleAppearance aAppearance,
+                                            nsIFrame* aFrame,
+                                            WidgetNodeType& aGtkWidgetType,
+                                            GtkWidgetState* aState,
+                                            gint* aWidgetFlags) {
+  if (aWidgetFlags) {
+    *aWidgetFlags = 0;
+  }
+
+  ElementState elementState = GetContentState(aFrame, aAppearance);
+  if (aState) {
+    memset(aState, 0, sizeof(GtkWidgetState));
+
+    // For XUL checkboxes and radio buttons, the state of the parent
+    // determines our state.
+    if (aWidgetFlags) {
+      if (elementState.HasState(ElementState::CHECKED)) {
+        *aWidgetFlags |= MOZ_GTK_WIDGET_CHECKED;
+      }
+      if (elementState.HasState(ElementState::INDETERMINATE)) {
+        *aWidgetFlags |= MOZ_GTK_WIDGET_INCONSISTENT;
+      }
+    }
+
+    aState->disabled =
+        elementState.HasState(ElementState::DISABLED) || IsReadOnly(aFrame);
+    aState->active = elementState.HasState(ElementState::ACTIVE);
+    aState->focused = elementState.HasState(ElementState::FOCUS);
+    aState->inHover = elementState.HasState(ElementState::HOVER);
+    aState->isDefault = IsDefaultButton(aFrame);
+    aState->canDefault = FALSE;  // XXX fix me
+
+    if (aAppearance == StyleAppearance::Button ||
+        aAppearance == StyleAppearance::Toolbarbutton ||
+        aAppearance == StyleAppearance::Dualbutton ||
+        aAppearance == StyleAppearance::ToolbarbuttonDropdown ||
+        aAppearance == StyleAppearance::Menulist ||
+        aAppearance == StyleAppearance::MenulistButton) {
+      aState->active &= aState->inHover;
+    } else if (aAppearance == StyleAppearance::Treetwisty ||
+               aAppearance == StyleAppearance::Treetwistyopen) {
+      if (nsTreeBodyFrame* treeBodyFrame = do_QueryFrame(aFrame)) {
+        const mozilla::AtomArray& atoms =
+            treeBodyFrame->GetPropertyArrayForCurrentDrawingItem();
+        aState->selected = atoms.Contains(nsGkAtoms::selected);
+        aState->inHover = atoms.Contains(nsGkAtoms::hover);
+      }
+    }
+
+    if (IsFrameContentNodeInNamespace(aFrame, kNameSpaceID_XUL)) {
+      // For these widget types, some element (either a child or parent)
+      // actually has element focus, so we check the focused attribute
+      // to see whether to draw in the focused state.
+      aState->focused = elementState.HasState(ElementState::FOCUSRING);
+      if (aAppearance == StyleAppearance::Radio ||
+          aAppearance == StyleAppearance::Checkbox) {
+        // In XUL, checkboxes and radios shouldn't have focus rings, their
+        // labels do
+        aState->focused = FALSE;
+      }
+
+      // A button with drop down menu open or an activated toggle button
+      // should always appear depressed.
+      if (aAppearance == StyleAppearance::Button ||
+          aAppearance == StyleAppearance::Toolbarbutton ||
+          aAppearance == StyleAppearance::Dualbutton ||
+          aAppearance == StyleAppearance::ToolbarbuttonDropdown ||
+          aAppearance == StyleAppearance::Menulist ||
+          aAppearance == StyleAppearance::MenulistButton) {
+        bool menuOpen = IsOpenButton(aFrame);
+        aState->depressed = IsCheckedButton(aFrame) || menuOpen;
+        // we must not highlight buttons with open drop down menus on hover.
+        aState->inHover = aState->inHover && !menuOpen;
+      }
+    }
+
+    if (aAppearance == StyleAppearance::MozWindowTitlebar ||
+        aAppearance == StyleAppearance::MozWindowTitlebarMaximized ||
+        aAppearance == StyleAppearance::MozWindowButtonClose ||
+        aAppearance == StyleAppearance::MozWindowButtonMinimize ||
+        aAppearance == StyleAppearance::MozWindowButtonMaximize ||
+        aAppearance == StyleAppearance::MozWindowButtonRestore) {
+      aState->backdrop = !nsWindow::GetTopLevelWindowActiveState(aFrame);
+    }
+  }
+
+  switch (aAppearance) {
+    case StyleAppearance::Button:
+      if (aWidgetFlags) *aWidgetFlags = GTK_RELIEF_NORMAL;
+      aGtkWidgetType = MOZ_GTK_BUTTON;
+      break;
+    case StyleAppearance::Toolbarbutton:
+    case StyleAppearance::Dualbutton:
+      if (aWidgetFlags) *aWidgetFlags = GTK_RELIEF_NONE;
+      aGtkWidgetType = MOZ_GTK_TOOLBAR_BUTTON;
+      break;
+    case StyleAppearance::Checkbox:
+      aGtkWidgetType = MOZ_GTK_CHECKBUTTON;
+      break;
+    case StyleAppearance::Radio:
+      aGtkWidgetType = MOZ_GTK_RADIOBUTTON;
+      break;
+    case StyleAppearance::Spinner:
+      aGtkWidgetType = MOZ_GTK_SPINBUTTON;
+      break;
+    case StyleAppearance::SpinnerUpbutton:
+      aGtkWidgetType = MOZ_GTK_SPINBUTTON_UP;
+      break;
+    case StyleAppearance::SpinnerDownbutton:
+      aGtkWidgetType = MOZ_GTK_SPINBUTTON_DOWN;
+      break;
+    case StyleAppearance::SpinnerTextfield:
+      aGtkWidgetType = MOZ_GTK_SPINBUTTON_ENTRY;
+      break;
+    case StyleAppearance::Range: {
+      if (IsRangeHorizontal(aFrame)) {
+        if (aWidgetFlags) *aWidgetFlags = GTK_ORIENTATION_HORIZONTAL;
+        aGtkWidgetType = MOZ_GTK_SCALE_HORIZONTAL;
+      } else {
+        if (aWidgetFlags) *aWidgetFlags = GTK_ORIENTATION_VERTICAL;
+        aGtkWidgetType = MOZ_GTK_SCALE_VERTICAL;
+      }
+      break;
+    }
+    case StyleAppearance::RangeThumb: {
+      if (IsRangeHorizontal(aFrame)) {
+        if (aWidgetFlags) *aWidgetFlags = GTK_ORIENTATION_HORIZONTAL;
+        aGtkWidgetType = MOZ_GTK_SCALE_THUMB_HORIZONTAL;
+      } else {
+        if (aWidgetFlags) *aWidgetFlags = GTK_ORIENTATION_VERTICAL;
+        aGtkWidgetType = MOZ_GTK_SCALE_THUMB_VERTICAL;
+      }
+      break;
+    }
+    case StyleAppearance::NumberInput:
+    case StyleAppearance::Textfield:
+      aGtkWidgetType = MOZ_GTK_ENTRY;
+      break;
+    case StyleAppearance::Textarea:
+      aGtkWidgetType = MOZ_GTK_TEXT_VIEW;
+      break;
+    case StyleAppearance::Listbox:
+    case StyleAppearance::Treeview:
+      aGtkWidgetType = MOZ_GTK_TREEVIEW;
+      break;
+    case StyleAppearance::Treetwisty:
+      aGtkWidgetType = MOZ_GTK_TREEVIEW_EXPANDER;
+      if (aWidgetFlags) *aWidgetFlags = GTK_EXPANDER_COLLAPSED;
+      break;
+    case StyleAppearance::Treetwistyopen:
+      aGtkWidgetType = MOZ_GTK_TREEVIEW_EXPANDER;
+      if (aWidgetFlags) *aWidgetFlags = GTK_EXPANDER_EXPANDED;
+      break;
+    case StyleAppearance::MenulistButton:
+    case StyleAppearance::Menulist:
+      aGtkWidgetType = MOZ_GTK_DROPDOWN;
+      if (aWidgetFlags)
+        *aWidgetFlags =
+            IsFrameContentNodeInNamespace(aFrame, kNameSpaceID_XHTML);
+      break;
+    case StyleAppearance::ToolbarbuttonDropdown:
+    case StyleAppearance::ButtonArrowDown:
+    case StyleAppearance::ButtonArrowUp:
+    case StyleAppearance::ButtonArrowNext:
+    case StyleAppearance::ButtonArrowPrevious:
+      aGtkWidgetType = MOZ_GTK_TOOLBARBUTTON_ARROW;
+      if (aWidgetFlags) {
+        *aWidgetFlags = GTK_ARROW_DOWN;
+
+        if (aAppearance == StyleAppearance::ButtonArrowUp)
+          *aWidgetFlags = GTK_ARROW_UP;
+        else if (aAppearance == StyleAppearance::ButtonArrowNext)
+          *aWidgetFlags = GTK_ARROW_RIGHT;
+        else if (aAppearance == StyleAppearance::ButtonArrowPrevious)
+          *aWidgetFlags = GTK_ARROW_LEFT;
+      }
+      break;
+    case StyleAppearance::Tooltip:
+      aGtkWidgetType = MOZ_GTK_TOOLTIP;
+      break;
+    case StyleAppearance::ProgressBar:
+      aGtkWidgetType = MOZ_GTK_PROGRESSBAR;
+      break;
+    case StyleAppearance::Progresschunk: {
+      nsIFrame* stateFrame = aFrame->GetParent();
+      ElementState elementState = GetContentState(stateFrame, aAppearance);
+
+      aGtkWidgetType = elementState.HasState(ElementState::INDETERMINATE)
+                           ? IsVerticalProgress(stateFrame)
+                                 ? MOZ_GTK_PROGRESS_CHUNK_VERTICAL_INDETERMINATE
+                                 : MOZ_GTK_PROGRESS_CHUNK_INDETERMINATE
+                           : MOZ_GTK_PROGRESS_CHUNK;
+    } break;
+    case StyleAppearance::TabScrollArrowBack:
+    case StyleAppearance::TabScrollArrowForward:
+      if (aWidgetFlags)
+        *aWidgetFlags = aAppearance == StyleAppearance::TabScrollArrowBack
+                            ? GTK_ARROW_LEFT
+                            : GTK_ARROW_RIGHT;
+      aGtkWidgetType = MOZ_GTK_TAB_SCROLLARROW;
+      break;
+    case StyleAppearance::Tabpanels:
+      aGtkWidgetType = MOZ_GTK_TABPANELS;
+      break;
+    case StyleAppearance::Tab: {
+      if (IsBottomTab(aFrame)) {
+        aGtkWidgetType = MOZ_GTK_TAB_BOTTOM;
+      } else {
+        aGtkWidgetType = MOZ_GTK_TAB_TOP;
+      }
+
+      if (aWidgetFlags) {
+        /* First bits will be used to store max(0,-bmargin) where bmargin
+         * is the bottom margin of the tab in pixels  (resp. top margin,
+         * for bottom tabs). */
+        *aWidgetFlags = GetTabMarginPixels(aFrame);
+
+        if (IsSelectedTab(aFrame)) *aWidgetFlags |= MOZ_GTK_TAB_SELECTED;
+
+        if (IsFirstTab(aFrame)) *aWidgetFlags |= MOZ_GTK_TAB_FIRST;
+      }
+    } break;
+    case StyleAppearance::Splitter:
+      if (IsHorizontal(aFrame))
+        aGtkWidgetType = MOZ_GTK_SPLITTER_VERTICAL;
+      else
+        aGtkWidgetType = MOZ_GTK_SPLITTER_HORIZONTAL;
+      break;
+    case StyleAppearance::MozWindowTitlebar:
+      aGtkWidgetType = MOZ_GTK_HEADER_BAR;
+      break;
+    case StyleAppearance::MozWindowDecorations:
+      aGtkWidgetType = MOZ_GTK_WINDOW_DECORATION;
+      break;
+    case StyleAppearance::MozWindowTitlebarMaximized:
+      aGtkWidgetType = MOZ_GTK_HEADER_BAR_MAXIMIZED;
+      break;
+    case StyleAppearance::MozWindowButtonBox:
+      aGtkWidgetType = MOZ_GTK_HEADER_BAR_BUTTON_BOX;
+      break;
+    case StyleAppearance::MozWindowButtonClose:
+      aGtkWidgetType = MOZ_GTK_HEADER_BAR_BUTTON_CLOSE;
+      break;
+    case StyleAppearance::MozWindowButtonMinimize:
+      aGtkWidgetType = MOZ_GTK_HEADER_BAR_BUTTON_MINIMIZE;
+      break;
+    case StyleAppearance::MozWindowButtonMaximize:
+      aGtkWidgetType = MOZ_GTK_HEADER_BAR_BUTTON_MAXIMIZE;
+      break;
+    case StyleAppearance::MozWindowButtonRestore:
+      aGtkWidgetType = MOZ_GTK_HEADER_BAR_BUTTON_MAXIMIZE_RESTORE;
+      break;
+    default:
+      return false;
+  }
+
+  return true;
+}
+
+class SystemCairoClipper : public ClipExporter {
+ public:
+  explicit SystemCairoClipper(cairo_t* aContext, gint aScaleFactor = 1)
+      : mContext(aContext), mScaleFactor(aScaleFactor) {}
+
+  void BeginClip(const Matrix& aTransform) override {
+    cairo_matrix_t mat;
+    GfxMatrixToCairoMatrix(aTransform, mat);
+    // We also need to remove the scale factor effect from the matrix
+    mat.y0 = mat.y0 / mScaleFactor;
+    mat.x0 = mat.x0 / mScaleFactor;
+    cairo_set_matrix(mContext, &mat);
+
+    cairo_new_path(mContext);
+  }
+
+  void MoveTo(const Point& aPoint) override {
+    cairo_move_to(mContext, aPoint.x / mScaleFactor, aPoint.y / mScaleFactor);
+    mBeginPoint = aPoint;
+    mCurrentPoint = aPoint;
+  }
+
+  void LineTo(const Point& aPoint) override {
+    cairo_line_to(mContext, aPoint.x / mScaleFactor, aPoint.y / mScaleFactor);
+    mCurrentPoint = aPoint;
+  }
+
+  void BezierTo(const Point& aCP1, const Point& aCP2,
+                const Point& aCP3) override {
+    cairo_curve_to(mContext, aCP1.x / mScaleFactor, aCP1.y / mScaleFactor,
+                   aCP2.x / mScaleFactor, aCP2.y / mScaleFactor,
+                   aCP3.x / mScaleFactor, aCP3.y / mScaleFactor);
+    mCurrentPoint = aCP3;
+  }
+
+  void QuadraticBezierTo(const Point& aCP1, const Point& aCP2) override {
+    Point CP0 = CurrentPoint();
+    Point CP1 = (CP0 + aCP1 * 2.0) / 3.0;
+    Point CP2 = (aCP2 + aCP1 * 2.0) / 3.0;
+    Point CP3 = aCP2;
+    cairo_curve_to(mContext, CP1.x / mScaleFactor, CP1.y / mScaleFactor,
+                   CP2.x / mScaleFactor, CP2.y / mScaleFactor,
+                   CP3.x / mScaleFactor, CP3.y / mScaleFactor);
+    mCurrentPoint = aCP2;
+  }
+
+  void Arc(const Point& aOrigin, float aRadius, float aStartAngle,
+           float aEndAngle, bool aAntiClockwise) override {
+    ArcToBezier(this, aOrigin, Size(aRadius, aRadius), aStartAngle, aEndAngle,
+                aAntiClockwise);
+  }
+
+  void Close() override {
+    cairo_close_path(mContext);
+    mCurrentPoint = mBeginPoint;
+  }
+
+  void EndClip() override { cairo_clip(mContext); }
+
+ private:
+  cairo_t* mContext;
+  gint mScaleFactor;
+};
+
+static void DrawThemeWithCairo(gfxContext* aContext, DrawTarget* aDrawTarget,
+                               GtkWidgetState aState,
+                               WidgetNodeType aGTKWidgetType, gint aFlags,
+                               GtkTextDirection aDirection, double aScaleFactor,
+                               bool aSnapped, const Point& aDrawOrigin,
+                               const nsIntSize& aDrawSize,
+                               GdkRectangle& aGDKRect,
+                               nsITheme::Transparency aTransparency) {
+  static auto sCairoSurfaceSetDeviceScalePtr =
+      (void (*)(cairo_surface_t*, double, double))dlsym(
+          RTLD_DEFAULT, "cairo_surface_set_device_scale");
+  const bool useHiDPIWidgets =
+      aScaleFactor != 1.0 && sCairoSurfaceSetDeviceScalePtr;
+
+  Point drawOffsetScaled;
+  Point drawOffsetOriginal;
+  Matrix transform;
+  if (!aSnapped) {
+    // If we are not snapped, we depend on the DT for translation.
+    drawOffsetOriginal = aDrawOrigin;
+    drawOffsetScaled = useHiDPIWidgets ? drawOffsetOriginal / aScaleFactor
+                                       : drawOffsetOriginal;
+    transform = aDrawTarget->GetTransform().PreTranslate(drawOffsetScaled);
+  } else {
+    // Otherwise, we only need to take the device offset into account.
+    drawOffsetOriginal = aDrawOrigin - aContext->GetDeviceOffset();
+    drawOffsetScaled = useHiDPIWidgets ? drawOffsetOriginal / aScaleFactor
+                                       : drawOffsetOriginal;
+    transform = Matrix::Translation(drawOffsetScaled);
+  }
+
+  if (!useHiDPIWidgets && aScaleFactor != 1) {
+    transform.PreScale(aScaleFactor, aScaleFactor);
+  }
+
+  cairo_matrix_t mat;
+  GfxMatrixToCairoMatrix(transform, mat);
+
+  Size clipSize((aDrawSize.width + aScaleFactor - 1) / aScaleFactor,
+                (aDrawSize.height + aScaleFactor - 1) / aScaleFactor);
+
+  // A direct Cairo draw target is not available, so we need to create a
+  // temporary one.
+#if defined(MOZ_X11) && defined(CAIRO_HAS_XLIB_SURFACE)
+  if (GdkIsX11Display()) {
+    // If using a Cairo xlib surface, then try to reuse it.
+    BorrowedXlibDrawable borrow(aDrawTarget);
+    if (Drawable drawable = borrow.GetDrawable()) {
+      nsIntSize size = borrow.GetSize();
+      cairo_surface_t* surf = cairo_xlib_surface_create(
+          borrow.GetDisplay(), drawable, borrow.GetVisual(), size.width,
+          size.height);
+      if (!NS_WARN_IF(!surf)) {
+        Point offset = borrow.GetOffset();
+        if (offset != Point()) {
+          cairo_surface_set_device_offset(surf, offset.x, offset.y);
+        }
+        cairo_t* cr = cairo_create(surf);
+        if (!NS_WARN_IF(!cr)) {
+          RefPtr<SystemCairoClipper> clipper = new SystemCairoClipper(cr);
+          aContext->ExportClip(*clipper);
+
+          cairo_set_matrix(cr, &mat);
+
+          cairo_new_path(cr);
+          cairo_rectangle(cr, 0, 0, clipSize.width, clipSize.height);
+          cairo_clip(cr);
+
+          moz_gtk_widget_paint(aGTKWidgetType, cr, &aGDKRect, &aState, aFlags,
+                               aDirection);
+
+          cairo_destroy(cr);
+        }
+        cairo_surface_destroy(surf);
+      }
+      borrow.Finish();
+      return;
+    }
+  }
+#endif
+
+  // Check if the widget requires complex masking that must be composited.
+  // Try to directly write to the draw target's pixels if possible.
+  uint8_t* data;
+  nsIntSize size;
+  int32_t stride;
+  SurfaceFormat format;
+  IntPoint origin;
+  if (aDrawTarget->LockBits(&data, &size, &stride, &format, &origin)) {
+    // Create a Cairo image surface context the device rectangle.
+    cairo_surface_t* surf = cairo_image_surface_create_for_data(
+        data, GfxFormatToCairoFormat(format), size.width, size.height, stride);
+    if (!NS_WARN_IF(!surf)) {
+      if (useHiDPIWidgets) {
+        sCairoSurfaceSetDeviceScalePtr(surf, aScaleFactor, aScaleFactor);
+      }
+      if (origin != IntPoint()) {
+        cairo_surface_set_device_offset(surf, -origin.x, -origin.y);
+      }
+      cairo_t* cr = cairo_create(surf);
+      if (!NS_WARN_IF(!cr)) {
+        RefPtr<SystemCairoClipper> clipper =
+            new SystemCairoClipper(cr, useHiDPIWidgets ? aScaleFactor : 1);
+        aContext->ExportClip(*clipper);
+
+        cairo_set_matrix(cr, &mat);
+
+        cairo_new_path(cr);
+        cairo_rectangle(cr, 0, 0, clipSize.width, clipSize.height);
+        cairo_clip(cr);
+
+        moz_gtk_widget_paint(aGTKWidgetType, cr, &aGDKRect, &aState, aFlags,
+                             aDirection);
+
+        cairo_destroy(cr);
+      }
+      cairo_surface_destroy(surf);
+    }
+    aDrawTarget->ReleaseBits(data);
+  } else {
+    // If the widget has any transparency, make sure to choose an alpha format.
+    format = aTransparency != nsITheme::eOpaque ? SurfaceFormat::B8G8R8A8
+                                                : aDrawTarget->GetFormat();
+    // Create a temporary data surface to render the widget into.
+    RefPtr<DataSourceSurface> dataSurface = Factory::CreateDataSourceSurface(
+        aDrawSize, format, aTransparency != nsITheme::eOpaque);
+    DataSourceSurface::MappedSurface map;
+    if (!NS_WARN_IF(
+            !(dataSurface &&
+              dataSurface->Map(DataSourceSurface::MapType::WRITE, &map)))) {
+      // Create a Cairo image surface wrapping the data surface.
+      cairo_surface_t* surf = cairo_image_surface_create_for_data(
+          map.mData, GfxFormatToCairoFormat(format), aDrawSize.width,
+          aDrawSize.height, map.mStride);
+      cairo_t* cr = nullptr;
+      if (!NS_WARN_IF(!surf)) {
+        cr = cairo_create(surf);
+        if (!NS_WARN_IF(!cr)) {
+          if (aScaleFactor != 1) {
+            if (useHiDPIWidgets) {
+              sCairoSurfaceSetDeviceScalePtr(surf, aScaleFactor, aScaleFactor);
+            } else {
+              cairo_scale(cr, aScaleFactor, aScaleFactor);
+            }
+          }
+
+          moz_gtk_widget_paint(aGTKWidgetType, cr, &aGDKRect, &aState, aFlags,
+                               aDirection);
+        }
+      }
+
+      // Unmap the surface before using it as a source
+      dataSurface->Unmap();
+
+      if (cr) {
+        // The widget either needs to be masked or has transparency, so use the
+        // slower drawing path.
+        aDrawTarget->DrawSurface(
+            dataSurface,
+            Rect(aSnapped ? drawOffsetOriginal -
+                                aDrawTarget->GetTransform().GetTranslation()
+                          : drawOffsetOriginal,
+                 Size(aDrawSize)),
+            Rect(0, 0, aDrawSize.width, aDrawSize.height));
+        cairo_destroy(cr);
+      }
+
+      if (surf) {
+        cairo_surface_destroy(surf);
+      }
+    }
+  }
+}
+
+CSSIntMargin nsNativeThemeGTK::GetExtraSizeForWidget(
+    nsIFrame* aFrame, StyleAppearance aAppearance) {
+  CSSIntMargin extra;
+  // Allow an extra one pixel above and below the thumb for certain
+  // GTK2 themes (Ximian Industrial, Bluecurve, Misty, at least);
+  // We modify the frame's overflow area.  See bug 297508.
+  switch (aAppearance) {
+    case StyleAppearance::Button: {
+      if (IsDefaultButton(aFrame)) {
+        // Some themes draw a default indicator outside the widget,
+        // include that in overflow
+        moz_gtk_button_get_default_overflow(&extra.top.value, &extra.left.value,
+                                            &extra.bottom.value,
+                                            &extra.right.value);
+        break;
+      }
+      return {};
+    }
+    default:
+      return {};
+  }
+  return extra;
+}
+
+bool nsNativeThemeGTK::IsWidgetVisible(StyleAppearance aAppearance) {
+  switch (aAppearance) {
+    case StyleAppearance::MozWindowButtonBox:
+      return false;
+    default:
+      break;
+  }
+  return true;
+}
+
+NS_IMETHODIMP
+nsNativeThemeGTK::DrawWidgetBackground(gfxContext* aContext, nsIFrame* aFrame,
+                                       StyleAppearance aAppearance,
+                                       const nsRect& aRect,
+                                       const nsRect& aDirtyRect,
+                                       DrawOverflow aDrawOverflow) {
+  if (IsWidgetNonNative(aFrame, aAppearance) != NonNative::No) {
+    return Theme::DrawWidgetBackground(aContext, aFrame, aAppearance, aRect,
+                                       aDirtyRect, aDrawOverflow);
+  }
+
+  GtkWidgetState state;
+  WidgetNodeType gtkWidgetType;
+  GtkTextDirection direction = GetTextDirection(aFrame);
+  gint flags;
+
+  if (!IsWidgetVisible(aAppearance) ||
+      !GetGtkWidgetAndState(aAppearance, aFrame, gtkWidgetType, &state,
+                            &flags)) {
+    return NS_OK;
+  }
+
+  gfxContext* ctx = aContext;
+  nsPresContext* presContext = aFrame->PresContext();
+
+  gfxRect rect = presContext->AppUnitsToGfxUnits(aRect);
+  gfxRect dirtyRect = presContext->AppUnitsToGfxUnits(aDirtyRect);
+
+  // Align to device pixels where sensible
+  // to provide crisper and faster drawing.
+  // Don't snap if it's a non-unit scale factor. We're going to have to take
+  // slow paths then in any case.
+  // We prioritize the size when snapping in order to avoid distorting widgets
+  // that should be square, which can occur if edges are snapped independently.
+  bool snapped = ctx->UserToDevicePixelSnapped(
+      rect, gfxContext::SnapOption::PrioritizeSize);
+  if (snapped) {
+    // Leave rect in device coords but make dirtyRect consistent.
+    dirtyRect = ctx->UserToDevice(dirtyRect);
+  }
+
+  // Translate the dirty rect so that it is wrt the widget top-left.
+  dirtyRect.MoveBy(-rect.TopLeft());
+  // Round out the dirty rect to gdk pixels to ensure that gtk draws
+  // enough pixels for interpolation to device pixels.
+  dirtyRect.RoundOut();
+
+  // GTK themes can only draw an integer number of pixels
+  // (even when not snapped).
+  LayoutDeviceIntRect widgetRect(0, 0, NS_lround(rect.Width()),
+                                 NS_lround(rect.Height()));
+
+  // This is the rectangle that will actually be drawn, in gdk pixels
+  LayoutDeviceIntRect drawingRect(
+      int32_t(dirtyRect.X()), int32_t(dirtyRect.Y()),
+      int32_t(dirtyRect.Width()), int32_t(dirtyRect.Height()));
+  if (widgetRect.IsEmpty() ||
+      !drawingRect.IntersectRect(widgetRect, drawingRect)) {
+    return NS_OK;
+  }
+
+  NS_ASSERTION(!IsWidgetTypeDisabled(mDisabledWidgetTypes, aAppearance),
+               "Trying to render an unsafe widget!");
+
+  bool safeState = IsWidgetStateSafe(mSafeWidgetStates, aAppearance, &state);
+  if (!safeState) {
+    gLastGdkError = 0;
+    gdk_error_trap_push();
+  }
+
+  Transparency transparency = GetWidgetTransparency(aFrame, aAppearance);
+
+  // gdk rectangles are wrt the drawing rect.
+  auto scaleFactor = GetWidgetScaleFactor(aFrame);
+  LayoutDeviceIntRect gdkDevRect(-drawingRect.TopLeft(), widgetRect.Size());
+
+  auto gdkCssRect = CSSIntRect::RoundIn(gdkDevRect / scaleFactor);
+  GdkRectangle gdk_rect = {gdkCssRect.x, gdkCssRect.y, gdkCssRect.width,
+                           gdkCssRect.height};
+
+  // Save actual widget scale to GtkWidgetState as we don't provide
+  // the frame to gtk3drawing routines.
+  state.image_scale = std::ceil(scaleFactor.scale);
+
+  // translate everything so (0,0) is the top left of the drawingRect
+  gfxPoint origin = rect.TopLeft() + drawingRect.TopLeft().ToUnknownPoint();
+
+  DrawThemeWithCairo(ctx, aContext->GetDrawTarget(), state, gtkWidgetType,
+                     flags, direction, scaleFactor.scale, snapped,
+                     ToPoint(origin), drawingRect.Size().ToUnknownSize(),
+                     gdk_rect, transparency);
+
+  if (!safeState) {
+    // gdk_flush() call from expose event crashes Gtk+ on Wayland
+    // (Gnome BZ #773307)
+    if (GdkIsX11Display()) {
+      gdk_flush();
+    }
+    gLastGdkError = gdk_error_trap_pop();
+
+    if (gLastGdkError) {
+#ifdef DEBUG
+      printf(
+          "GTK theme failed for widget type %d, error was %d, state was "
+          "[active=%d,focused=%d,inHover=%d,disabled=%d]\n",
+          static_cast<int>(aAppearance), gLastGdkError, state.active,
+          state.focused, state.inHover, state.disabled);
+#endif
+      NS_WARNING("GTK theme failed; disabling unsafe widget");
+      SetWidgetTypeDisabled(mDisabledWidgetTypes, aAppearance);
+      // force refresh of the window, because the widget was not
+      // successfully drawn it must be redrawn using the default look
+      RefreshWidgetWindow(aFrame);
+    } else {
+      SetWidgetStateSafe(mSafeWidgetStates, aAppearance, &state);
+    }
+  }
+
+  // Indeterminate progress bar are animated.
+  if (gtkWidgetType == MOZ_GTK_PROGRESS_CHUNK_INDETERMINATE ||
+      gtkWidgetType == MOZ_GTK_PROGRESS_CHUNK_VERTICAL_INDETERMINATE) {
+    if (!QueueAnimatedContentForRefresh(aFrame->GetContent(), 30)) {
+      NS_WARNING("unable to animate widget!");
+    }
+  }
+
+  return NS_OK;
+}
+
+bool nsNativeThemeGTK::CreateWebRenderCommandsForWidget(
+    mozilla::wr::DisplayListBuilder& aBuilder,
+    mozilla::wr::IpcResourceUpdateQueue& aResources,
+    const mozilla::layers::StackingContextHelper& aSc,
+    mozilla::layers::RenderRootStateManager* aManager, nsIFrame* aFrame,
+    StyleAppearance aAppearance, const nsRect& aRect) {
+  if (IsWidgetNonNative(aFrame, aAppearance) != NonNative::No) {
+    return Theme::CreateWebRenderCommandsForWidget(
+        aBuilder, aResources, aSc, aManager, aFrame, aAppearance, aRect);
+  }
+  return false;
+}
+
+WidgetNodeType nsNativeThemeGTK::NativeThemeToGtkTheme(
+    StyleAppearance aAppearance, nsIFrame* aFrame) {
+  WidgetNodeType gtkWidgetType;
+  gint unusedFlags;
+
+  if (!GetGtkWidgetAndState(aAppearance, aFrame, gtkWidgetType, nullptr,
+                            &unusedFlags)) {
+    MOZ_ASSERT_UNREACHABLE("Unknown native widget to gtk widget mapping");
+    return MOZ_GTK_WINDOW;
+  }
+  return gtkWidgetType;
+}
+
+static void FixupForVerticalWritingMode(WritingMode aWritingMode,
+                                        CSSIntMargin* aResult) {
+  if (aWritingMode.IsVertical()) {
+    bool rtl = aWritingMode.IsBidiRTL();
+    LogicalMargin logical(aWritingMode, aResult->top,
+                          rtl ? aResult->left : aResult->right, aResult->bottom,
+                          rtl ? aResult->right : aResult->left);
+    nsMargin physical = logical.GetPhysicalMargin(aWritingMode);
+    aResult->top = physical.top;
+    aResult->right = physical.right;
+    aResult->bottom = physical.bottom;
+    aResult->left = physical.left;
+  }
+}
+
+CSSIntMargin nsNativeThemeGTK::GetCachedWidgetBorder(
+    nsIFrame* aFrame, StyleAppearance aAppearance,
+    GtkTextDirection aDirection) {
+  CSSIntMargin result;
+
+  WidgetNodeType gtkWidgetType;
+  gint unusedFlags;
+  if (GetGtkWidgetAndState(aAppearance, aFrame, gtkWidgetType, nullptr,
+                           &unusedFlags)) {
+    MOZ_ASSERT(0 <= gtkWidgetType && gtkWidgetType < MOZ_GTK_WIDGET_NODE_COUNT);
+    uint8_t cacheIndex = gtkWidgetType / 8;
+    uint8_t cacheBit = 1u << (gtkWidgetType % 8);
+
+    if (mBorderCacheValid[cacheIndex] & cacheBit) {
+      result = mBorderCache[gtkWidgetType];
+    } else {
+      moz_gtk_get_widget_border(gtkWidgetType, &result.left.value,
+                                &result.top.value, &result.right.value,
+                                &result.bottom.value, aDirection);
+      if (gtkWidgetType != MOZ_GTK_DROPDOWN) {  // depends on aDirection
+        mBorderCacheValid[cacheIndex] |= cacheBit;
+        mBorderCache[gtkWidgetType] = result;
+      }
+    }
+  }
+  FixupForVerticalWritingMode(aFrame->GetWritingMode(), &result);
+  return result;
+}
+
+LayoutDeviceIntMargin nsNativeThemeGTK::GetWidgetBorder(
+    nsDeviceContext* aContext, nsIFrame* aFrame, StyleAppearance aAppearance) {
+  if (IsWidgetAlwaysNonNative(aFrame, aAppearance)) {
+    return Theme::GetWidgetBorder(aContext, aFrame, aAppearance);
+  }
+
+  CSSIntMargin result;
+  GtkTextDirection direction = GetTextDirection(aFrame);
+  switch (aAppearance) {
+    case StyleAppearance::Toolbox:
+      // gtk has no toolbox equivalent.  So, although we map toolbox to
+      // gtk's 'toolbar' for purposes of painting the widget background,
+      // we don't use the toolbar border for toolbox.
+      break;
+    case StyleAppearance::Dualbutton:
+      // TOOLBAR_DUAL_BUTTON is an interesting case.  We want a border to draw
+      // around the entire button + dropdown, and also an inner border if you're
+      // over the button part.  But, we want the inner button to be right up
+      // against the edge of the outer button so that the borders overlap.
+      // To make this happen, we draw a button border for the outer button,
+      // but don't reserve any space for it.
+      break;
+    case StyleAppearance::Tab: {
+      WidgetNodeType gtkWidgetType;
+      gint flags;
+
+      if (!GetGtkWidgetAndState(aAppearance, aFrame, gtkWidgetType, nullptr,
+                                &flags)) {
+        return {};
+      }
+      moz_gtk_get_tab_border(&result.left.value, &result.top.value,
+                             &result.right.value, &result.bottom.value,
+                             direction, (GtkTabFlags)flags, gtkWidgetType);
+    } break;
+    default: {
+      result = GetCachedWidgetBorder(aFrame, aAppearance, direction);
+    }
+  }
+
+  return (CSSMargin(result) * GetWidgetScaleFactor(aFrame)).Rounded();
+}
+
+bool nsNativeThemeGTK::GetWidgetPadding(nsDeviceContext* aContext,
+                                        nsIFrame* aFrame,
+                                        StyleAppearance aAppearance,
+                                        LayoutDeviceIntMargin* aResult) {
+  if (IsWidgetAlwaysNonNative(aFrame, aAppearance)) {
+    return Theme::GetWidgetPadding(aContext, aFrame, aAppearance, aResult);
+  }
+  switch (aAppearance) {
+    case StyleAppearance::Toolbarbutton:
+    case StyleAppearance::Tooltip:
+    case StyleAppearance::MozWindowButtonBox:
+    case StyleAppearance::MozWindowButtonClose:
+    case StyleAppearance::MozWindowButtonMinimize:
+    case StyleAppearance::MozWindowButtonMaximize:
+    case StyleAppearance::MozWindowButtonRestore:
+    case StyleAppearance::Dualbutton:
+    case StyleAppearance::TabScrollArrowBack:
+    case StyleAppearance::TabScrollArrowForward:
+    case StyleAppearance::ToolbarbuttonDropdown:
+    case StyleAppearance::ButtonArrowUp:
+    case StyleAppearance::ButtonArrowDown:
+    case StyleAppearance::ButtonArrowNext:
+    case StyleAppearance::ButtonArrowPrevious:
+    case StyleAppearance::RangeThumb:
+    // Radios and checkboxes return a fixed size in GetMinimumWidgetSize
+    // and have a meaningful baseline, so they can't have
+    // author-specified padding.
+    case StyleAppearance::Checkbox:
+    case StyleAppearance::Radio:
+      aResult->SizeTo(0, 0, 0, 0);
+      return true;
+    default:
+      break;
+  }
+
+  return false;
+}
+
+bool nsNativeThemeGTK::GetWidgetOverflow(nsDeviceContext* aContext,
+                                         nsIFrame* aFrame,
+                                         StyleAppearance aAppearance,
+                                         nsRect* aOverflowRect) {
+  if (IsWidgetNonNative(aFrame, aAppearance) != NonNative::No) {
+    return Theme::GetWidgetOverflow(aContext, aFrame, aAppearance,
+                                    aOverflowRect);
+  }
+  auto overflow = GetExtraSizeForWidget(aFrame, aAppearance);
+  if (overflow == CSSIntMargin()) {
+    return false;
+  }
+  aOverflowRect->Inflate(CSSIntMargin::ToAppUnits(overflow));
+  return true;
+}
+
+auto nsNativeThemeGTK::IsWidgetNonNative(nsIFrame* aFrame,
+                                         StyleAppearance aAppearance)
+    -> NonNative {
+  if (IsWidgetAlwaysNonNative(aFrame, aAppearance)) {
+    return NonNative::Always;
+  }
+
+  // If the current GTK theme color scheme matches our color-scheme, then we
+  // can draw a native widget.
+  if (LookAndFeel::ColorSchemeForFrame(aFrame) ==
+      PreferenceSheet::ColorSchemeForChrome()) {
+    return NonNative::No;
+  }
+
+  // As an special-case, for tooltips, we check if the tooltip color is the
+  // same between the light and dark themes. If so we can get away with drawing
+  // the native widget, see bug 1817396.
+  if (aAppearance == StyleAppearance::Tooltip) {
+    auto darkColor =
+        LookAndFeel::Color(StyleSystemColor::Infotext, ColorScheme::Dark,
+                           LookAndFeel::UseStandins::No);
+    auto lightColor =
+        LookAndFeel::Color(StyleSystemColor::Infotext, ColorScheme::Light,
+                           LookAndFeel::UseStandins::No);
+    if (darkColor == lightColor) {
+      return NonNative::No;
+    }
+  }
+
+  // If the non-native theme doesn't support the widget then oh well...
+  if (!Theme::ThemeSupportsWidget(aFrame->PresContext(), aFrame, aAppearance)) {
+    return NonNative::No;
+  }
+
+  return NonNative::BecauseColorMismatch;
+}
+
+bool nsNativeThemeGTK::IsWidgetAlwaysNonNative(nsIFrame* aFrame,
+                                               StyleAppearance aAppearance) {
+  return Theme::IsWidgetAlwaysNonNative(aFrame, aAppearance) ||
+         aAppearance == StyleAppearance::MozMenulistArrowButton;
+}
+
+LayoutDeviceIntSize nsNativeThemeGTK::GetMinimumWidgetSize(
+    nsPresContext* aPresContext, nsIFrame* aFrame,
+    StyleAppearance aAppearance) {
+  if (IsWidgetAlwaysNonNative(aFrame, aAppearance)) {
+    return Theme::GetMinimumWidgetSize(aPresContext, aFrame, aAppearance);
+  }
+
+  CSSIntSize result;
+  switch (aAppearance) {
+    case StyleAppearance::Splitter: {
+      if (IsHorizontal(aFrame)) {
+        moz_gtk_splitter_get_metrics(GTK_ORIENTATION_HORIZONTAL, &result.width);
+      } else {
+        moz_gtk_splitter_get_metrics(GTK_ORIENTATION_VERTICAL, &result.height);
+      }
+    } break;
+    case StyleAppearance::RangeThumb: {
+      if (IsRangeHorizontal(aFrame)) {
+        moz_gtk_get_scalethumb_metrics(GTK_ORIENTATION_HORIZONTAL,
+                                       &result.width, &result.height);
+      } else {
+        moz_gtk_get_scalethumb_metrics(GTK_ORIENTATION_VERTICAL, &result.width,
+                                       &result.width);
+      }
+    } break;
+    case StyleAppearance::TabScrollArrowBack:
+    case StyleAppearance::TabScrollArrowForward: {
+      moz_gtk_get_tab_scroll_arrow_size(&result.width, &result.height);
+    } break;
+    case StyleAppearance::Checkbox:
+    case StyleAppearance::Radio: {
+      const ToggleGTKMetrics* metrics = GetToggleMetrics(
+          aAppearance == StyleAppearance::Radio ? MOZ_GTK_RADIOBUTTON
+                                                : MOZ_GTK_CHECKBUTTON);
+      result.width = metrics->minSizeWithBorder.width;
+      result.height = metrics->minSizeWithBorder.height;
+    } break;
+    case StyleAppearance::ToolbarbuttonDropdown:
+    case StyleAppearance::ButtonArrowUp:
+    case StyleAppearance::ButtonArrowDown:
+    case StyleAppearance::ButtonArrowNext:
+    case StyleAppearance::ButtonArrowPrevious: {
+      moz_gtk_get_arrow_size(MOZ_GTK_TOOLBARBUTTON_ARROW, &result.width,
+                             &result.height);
+    } break;
+    case StyleAppearance::MozWindowButtonClose: {
+      const ToolbarButtonGTKMetrics* metrics =
+          GetToolbarButtonMetrics(MOZ_GTK_HEADER_BAR_BUTTON_CLOSE);
+      result.width = metrics->minSizeWithBorderMargin.width;
+      result.height = metrics->minSizeWithBorderMargin.height;
+      break;
+    }
+    case StyleAppearance::MozWindowButtonMinimize: {
+      const ToolbarButtonGTKMetrics* metrics =
+          GetToolbarButtonMetrics(MOZ_GTK_HEADER_BAR_BUTTON_MINIMIZE);
+      result.width = metrics->minSizeWithBorderMargin.width;
+      result.height = metrics->minSizeWithBorderMargin.height;
+      break;
+    }
+    case StyleAppearance::MozWindowButtonMaximize:
+    case StyleAppearance::MozWindowButtonRestore: {
+      const ToolbarButtonGTKMetrics* metrics =
+          GetToolbarButtonMetrics(MOZ_GTK_HEADER_BAR_BUTTON_MAXIMIZE);
+      result.width = metrics->minSizeWithBorderMargin.width;
+      result.height = metrics->minSizeWithBorderMargin.height;
+      break;
+    }
+    case StyleAppearance::Button:
+    case StyleAppearance::Menulist:
+    case StyleAppearance::MenulistButton: {
+      if (aAppearance == StyleAppearance::Menulist ||
+          aAppearance == StyleAppearance::MenulistButton) {
+        // Include the arrow size.
+        moz_gtk_get_arrow_size(MOZ_GTK_DROPDOWN, &result.width, &result.height);
+      }
+      // else the minimum size is missing consideration of container
+      // descendants; the value returned here will not be helpful, but the
+      // box model may consider border and padding with child minimum sizes.
+
+      CSSIntMargin border =
+          GetCachedWidgetBorder(aFrame, aAppearance, GetTextDirection(aFrame));
+      result.width += border.LeftRight();
+      result.height += border.TopBottom();
+    } break;
+    case StyleAppearance::NumberInput:
+    case StyleAppearance::Textfield: {
+      gint contentHeight = 0;
+      gint borderPaddingHeight = 0;
+      moz_gtk_get_entry_min_height(&contentHeight, &borderPaddingHeight);
+
+      // Scale the min content height proportionately with the font-size if it's
+      // smaller than the default one. This prevents <input type=text
+      // style="font-size: .5em"> from keeping a ridiculously large size, for
+      // example.
+      const gfxFloat fieldFontSizeInCSSPixels = [] {
+        gfxFontStyle fieldFontStyle;
+        nsAutoString unusedFontName;
+        DebugOnly<bool> result = LookAndFeel::GetFont(
+            LookAndFeel::FontID::MozField, unusedFontName, fieldFontStyle);
+        MOZ_ASSERT(result, "GTK look and feel supports the field font");
+        // NOTE: GetFont returns font sizes in CSS pixels, and we want just
+        // that.
+        return fieldFontStyle.size;
+      }();
+
+      const gfxFloat fontSize = aFrame->StyleFont()->mFont.size.ToCSSPixels();
+      if (fieldFontSizeInCSSPixels > fontSize) {
+        contentHeight =
+            std::round(contentHeight * fontSize / fieldFontSizeInCSSPixels);
+      }
+
+      gint height = contentHeight + borderPaddingHeight;
+      if (aFrame->GetWritingMode().IsVertical()) {
+        result.width = height;
+      } else {
+        result.height = height;
+      }
+    } break;
+    case StyleAppearance::Spinner:
+      // hard code these sizes
+      result.width = 14;
+      result.height = 26;
+      break;
+    case StyleAppearance::SpinnerUpbutton:
+    case StyleAppearance::SpinnerDownbutton:
+      // hard code these sizes
+      result.width = 14;
+      result.height = 13;
+      break;
+    case StyleAppearance::Treetwisty:
+    case StyleAppearance::Treetwistyopen: {
+      gint expander_size;
+      moz_gtk_get_treeview_expander_size(&expander_size);
+      result.width = result.height = expander_size;
+    } break;
+    default:
+      break;
+  }
+
+  return LayoutDeviceIntSize::Round(CSSSize(result) *
+                                    GetWidgetScaleFactor(aFrame));
+}
+
+NS_IMETHODIMP
+nsNativeThemeGTK::WidgetStateChanged(nsIFrame* aFrame,
+                                     StyleAppearance aAppearance,
+                                     nsAtom* aAttribute, bool* aShouldRepaint,
+                                     const nsAttrValue* aOldValue) {
+  *aShouldRepaint = false;
+
+  if (IsWidgetNonNative(aFrame, aAppearance) != NonNative::No) {
+    return Theme::WidgetStateChanged(aFrame, aAppearance, aAttribute,
+                                     aShouldRepaint, aOldValue);
+  }
+
+  // Some widget types just never change state.
+  if (aAppearance == StyleAppearance::Toolbox ||
+      aAppearance == StyleAppearance::Toolbar ||
+      aAppearance == StyleAppearance::Progresschunk ||
+      aAppearance == StyleAppearance::ProgressBar ||
+      aAppearance == StyleAppearance::Tooltip ||
+      aAppearance == StyleAppearance::MozWindowDecorations) {
+    return NS_OK;
+  }
+
+  if (aAppearance == StyleAppearance::MozWindowTitlebar ||
+      aAppearance == StyleAppearance::MozWindowTitlebarMaximized ||
+      aAppearance == StyleAppearance::MozWindowButtonClose ||
+      aAppearance == StyleAppearance::MozWindowButtonMinimize ||
+      aAppearance == StyleAppearance::MozWindowButtonMaximize ||
+      aAppearance == StyleAppearance::MozWindowButtonRestore) {
+    *aShouldRepaint = true;
+    return NS_OK;
+  }
+
+  // XXXdwh Not sure what can really be done here.  Can at least guess for
+  // specific widgets that they're highly unlikely to have certain states.
+  // For example, a toolbar doesn't care about any states.
+  if (!aAttribute) {
+    // Hover/focus/active changed.  Always repaint.
+    *aShouldRepaint = true;
+    return NS_OK;
+  }
+
+  // Check the attribute to see if it's relevant.
+  // disabled, checked, dlgtype, default, etc.
+  *aShouldRepaint = false;
+  if (aAttribute == nsGkAtoms::disabled || aAttribute == nsGkAtoms::checked ||
+      aAttribute == nsGkAtoms::selected ||
+      aAttribute == nsGkAtoms::visuallyselected ||
+      aAttribute == nsGkAtoms::focused || aAttribute == nsGkAtoms::readonly ||
+      aAttribute == nsGkAtoms::_default ||
+      aAttribute == nsGkAtoms::menuactive || aAttribute == nsGkAtoms::open) {
+    *aShouldRepaint = true;
+    return NS_OK;
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsNativeThemeGTK::ThemeChanged() {
+  memset(mDisabledWidgetTypes, 0, sizeof(mDisabledWidgetTypes));
+  memset(mSafeWidgetStates, 0, sizeof(mSafeWidgetStates));
+  memset(mBorderCacheValid, 0, sizeof(mBorderCacheValid));
+  return NS_OK;
+}
+
+NS_IMETHODIMP_(bool)
+nsNativeThemeGTK::ThemeSupportsWidget(nsPresContext* aPresContext,
+                                      nsIFrame* aFrame,
+                                      StyleAppearance aAppearance) {
+  if (IsWidgetTypeDisabled(mDisabledWidgetTypes, aAppearance)) {
+    return false;
+  }
+
+  if (IsWidgetAlwaysNonNative(aFrame, aAppearance)) {
+    return Theme::ThemeSupportsWidget(aPresContext, aFrame, aAppearance);
+  }
+
+  switch (aAppearance) {
+    // Combobox dropdowns don't support native theming in vertical mode.
+    case StyleAppearance::Menulist:
+    case StyleAppearance::MenulistButton:
+      if (aFrame && aFrame->GetWritingMode().IsVertical()) {
+        return false;
+      }
+      [[fallthrough]];
+
+    case StyleAppearance::Button:
+    case StyleAppearance::Radio:
+    case StyleAppearance::Checkbox:
+    case StyleAppearance::Toolbox:  // N/A
+    case StyleAppearance::Toolbarbutton:
+    case StyleAppearance::Dualbutton:  // so we can override the border with 0
+    case StyleAppearance::ToolbarbuttonDropdown:
+    case StyleAppearance::ButtonArrowUp:
+    case StyleAppearance::ButtonArrowDown:
+    case StyleAppearance::ButtonArrowNext:
+    case StyleAppearance::ButtonArrowPrevious:
+    case StyleAppearance::Listbox:
+    case StyleAppearance::Treeview:
+      // case StyleAppearance::Treeitem:
+    case StyleAppearance::Treetwisty:
+      // case StyleAppearance::Treeline:
+      // case StyleAppearance::Treeheader:
+    case StyleAppearance::Treetwistyopen:
+    case StyleAppearance::ProgressBar:
+    case StyleAppearance::Progresschunk:
+    case StyleAppearance::Tab:
+    // case StyleAppearance::Tabpanel:
+    case StyleAppearance::Tabpanels:
+    case StyleAppearance::TabScrollArrowBack:
+    case StyleAppearance::TabScrollArrowForward:
+    case StyleAppearance::Tooltip:
+    case StyleAppearance::Spinner:
+    case StyleAppearance::SpinnerUpbutton:
+    case StyleAppearance::SpinnerDownbutton:
+    case StyleAppearance::SpinnerTextfield:
+    case StyleAppearance::NumberInput:
+    case StyleAppearance::Textfield:
+    case StyleAppearance::Textarea:
+    case StyleAppearance::Range:
+    case StyleAppearance::RangeThumb:
+    case StyleAppearance::Splitter:
+    case StyleAppearance::MozWindowButtonBox:
+    case StyleAppearance::MozWindowButtonClose:
+    case StyleAppearance::MozWindowButtonMinimize:
+    case StyleAppearance::MozWindowButtonMaximize:
+    case StyleAppearance::MozWindowButtonRestore:
+    case StyleAppearance::MozWindowTitlebar:
+    case StyleAppearance::MozWindowTitlebarMaximized:
+    case StyleAppearance::MozWindowDecorations:
+      return !IsWidgetStyled(aPresContext, aFrame, aAppearance);
+    default:
+      break;
+  }
+
+  return false;
+}
+
+NS_IMETHODIMP_(bool)
+nsNativeThemeGTK::WidgetIsContainer(StyleAppearance aAppearance) {
+  // XXXdwh At some point flesh all of this out.
+  if (aAppearance == StyleAppearance::Radio ||
+      aAppearance == StyleAppearance::RangeThumb ||
+      aAppearance == StyleAppearance::Checkbox ||
+      aAppearance == StyleAppearance::TabScrollArrowBack ||
+      aAppearance == StyleAppearance::TabScrollArrowForward ||
+      aAppearance == StyleAppearance::ButtonArrowUp ||
+      aAppearance == StyleAppearance::ButtonArrowDown ||
+      aAppearance == StyleAppearance::ButtonArrowNext ||
+      aAppearance == StyleAppearance::ButtonArrowPrevious)
+    return false;
+  return true;
+}
+
+bool nsNativeThemeGTK::ThemeDrawsFocusForWidget(nsIFrame* aFrame,
+                                                StyleAppearance aAppearance) {
+  if (IsWidgetNonNative(aFrame, aAppearance) != NonNative::No) {
+    return Theme::ThemeDrawsFocusForWidget(aFrame, aAppearance);
+  }
+  switch (aAppearance) {
+    case StyleAppearance::Checkbox:
+    case StyleAppearance::Radio:
+      // These are drawn only for non-XUL elements, but in XUL the label has
+      // the focus ring.
+      return true;
+    case StyleAppearance::Button:
+    case StyleAppearance::Menulist:
+    case StyleAppearance::MenulistButton:
+    case StyleAppearance::Textarea:
+    case StyleAppearance::Textfield:
+    case StyleAppearance::NumberInput:
+      return true;
+    default:
+      return false;
+  }
+}
+
+bool nsNativeThemeGTK::ThemeNeedsComboboxDropmarker() { return false; }
+
+nsITheme::Transparency nsNativeThemeGTK::GetWidgetTransparency(
+    nsIFrame* aFrame, StyleAppearance aAppearance) {
+  if (IsWidgetNonNative(aFrame, aAppearance) != NonNative::No) {
+    return Theme::GetWidgetTransparency(aFrame, aAppearance);
+  }
+
+  switch (aAppearance) {
+    // Tooltips use gtk_paint_flat_box() on Gtk2
+    // but are shaped on Gtk3
+    case StyleAppearance::Tooltip:
+      return eTransparent;
+    default:
+      return eUnknownTransparency;
+  }
+}
+
+already_AddRefed<Theme> do_CreateNativeThemeDoNotUseDirectly() {
+  if (gfxPlatform::IsHeadless()) {
+    return do_AddRef(new Theme(Theme::ScrollbarStyle()));
+  }
+  return do_AddRef(new nsNativeThemeGTK());
+}