Adding upstream version 86.0.1.upstream/86.0.1upstream

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

1 files changed, 4013 insertions, 0 deletions

diff --git a/widget/windows/nsNativeThemeWin.cpp b/widget/windows/nsNativeThemeWin.cpp
new file mode 100644
index 0000000000..b6240d9ac7
--- /dev/null
+++ b/widget/windows/nsNativeThemeWin.cpp
@@ -0,0 +1,4013 @@
+/* -*- Mode: C++; tab-width: 40; 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 "nsNativeThemeWin.h"
+
+#include "mozilla/ClearOnShutdown.h"
+#include "mozilla/EventStates.h"
+#include "mozilla/Logging.h"
+#include "mozilla/RelativeLuminanceUtils.h"
+#include "mozilla/StaticPrefs_layout.h"
+#include "mozilla/StaticPrefs_widget.h"
+#include "mozilla/WindowsVersion.h"
+#include "mozilla/gfx/Types.h"  // for Color::FromABGR
+#include "nsNativeBasicTheme.h"
+#include "nsColor.h"
+#include "nsDeviceContext.h"
+#include "nsRect.h"
+#include "nsSize.h"
+#include "nsTransform2D.h"
+#include "nsStyleConsts.h"
+#include "nsPresContext.h"
+#include "nsIContent.h"
+#include "nsIContentInlines.h"
+#include "nsIFrame.h"
+#include "nsLayoutUtils.h"
+#include "nsNameSpaceManager.h"
+#include "nsLookAndFeel.h"
+#include "nsMenuFrame.h"
+#include "nsGkAtoms.h"
+#include <malloc.h>
+#include "nsWindow.h"
+#include "nsComboboxControlFrame.h"
+#include "prinrval.h"
+#include "ScrollbarUtil.h"
+#include "WinUtils.h"
+
+#include "gfxPlatform.h"
+#include "gfxContext.h"
+#include "gfxWindowsPlatform.h"
+#include "gfxWindowsSurface.h"
+#include "gfxWindowsNativeDrawing.h"
+
+#include "nsUXThemeData.h"
+#include "nsUXThemeConstants.h"
+#include <algorithm>
+
+using namespace mozilla;
+using namespace mozilla::gfx;
+using namespace mozilla::widget;
+
+extern mozilla::LazyLogModule gWindowsLog;
+
+NS_IMPL_ISUPPORTS_INHERITED(nsNativeThemeWin, nsNativeTheme, nsITheme)
+
+nsNativeThemeWin::nsNativeThemeWin()
+    : mProgressDeterminateTimeStamp(TimeStamp::Now()),
+      mProgressIndeterminateTimeStamp(TimeStamp::Now()),
+      mBorderCacheValid(),
+      mMinimumWidgetSizeCacheValid(),
+      mGutterSizeCacheValid(false) {
+  // If there is a relevant change in forms.css for windows platform,
+  // static widget style variables (e.g. sButtonBorderSize) should be
+  // reinitialized here.
+}
+
+nsNativeThemeWin::~nsNativeThemeWin() { nsUXThemeData::Invalidate(); }
+
+static int32_t GetTopLevelWindowActiveState(nsIFrame* aFrame) {
+  // Used by window frame and button box rendering. We can end up in here in
+  // the content process when rendering one of these moz styles freely in a
+  // page. Bail in this case, there is no applicable window focus state.
+  if (!XRE_IsParentProcess()) {
+    return mozilla::widget::themeconst::FS_INACTIVE;
+  }
+  // All headless windows are considered active so they are painted.
+  if (gfxPlatform::IsHeadless()) {
+    return mozilla::widget::themeconst::FS_ACTIVE;
+  }
+  // Get the widget. nsIFrame's GetNearestWidget walks up the view chain
+  // until it finds a real window.
+  nsIWidget* widget = aFrame->GetNearestWidget();
+  nsWindowBase* window = static_cast<nsWindowBase*>(widget);
+  if (!window) return mozilla::widget::themeconst::FS_INACTIVE;
+  if (widget && !window->IsTopLevelWidget() &&
+      !(window = window->GetParentWindowBase(false)))
+    return mozilla::widget::themeconst::FS_INACTIVE;
+
+  if (window->GetWindowHandle() == ::GetActiveWindow())
+    return mozilla::widget::themeconst::FS_ACTIVE;
+  return mozilla::widget::themeconst::FS_INACTIVE;
+}
+
+static int32_t GetWindowFrameButtonState(nsIFrame* aFrame,
+                                         EventStates eventState) {
+  if (GetTopLevelWindowActiveState(aFrame) ==
+      mozilla::widget::themeconst::FS_INACTIVE) {
+    if (eventState.HasState(NS_EVENT_STATE_HOVER))
+      return mozilla::widget::themeconst::BS_HOT;
+    return mozilla::widget::themeconst::BS_INACTIVE;
+  }
+
+  if (eventState.HasState(NS_EVENT_STATE_HOVER)) {
+    if (eventState.HasState(NS_EVENT_STATE_ACTIVE))
+      return mozilla::widget::themeconst::BS_PUSHED;
+    return mozilla::widget::themeconst::BS_HOT;
+  }
+  return mozilla::widget::themeconst::BS_NORMAL;
+}
+
+static int32_t GetClassicWindowFrameButtonState(EventStates eventState) {
+  if (eventState.HasState(NS_EVENT_STATE_ACTIVE) &&
+      eventState.HasState(NS_EVENT_STATE_HOVER))
+    return DFCS_BUTTONPUSH | DFCS_PUSHED;
+  return DFCS_BUTTONPUSH;
+}
+
+static bool IsTopLevelMenu(nsIFrame* aFrame) {
+  bool isTopLevel(false);
+  nsMenuFrame* menuFrame = do_QueryFrame(aFrame);
+  if (menuFrame) {
+    isTopLevel = menuFrame->IsOnMenuBar();
+  }
+  return isTopLevel;
+}
+
+static MARGINS GetCheckboxMargins(HANDLE theme, HDC hdc) {
+  MARGINS checkboxContent = {0};
+  GetThemeMargins(theme, hdc, MENU_POPUPCHECK, MCB_NORMAL, TMT_CONTENTMARGINS,
+                  nullptr, &checkboxContent);
+  return checkboxContent;
+}
+
+static SIZE GetCheckboxBGSize(HANDLE theme, HDC hdc) {
+  SIZE checkboxSize;
+  GetThemePartSize(theme, hdc, MENU_POPUPCHECK, MC_CHECKMARKNORMAL, nullptr,
+                   TS_TRUE, &checkboxSize);
+
+  MARGINS checkboxMargins = GetCheckboxMargins(theme, hdc);
+
+  int leftMargin = checkboxMargins.cxLeftWidth;
+  int rightMargin = checkboxMargins.cxRightWidth;
+  int topMargin = checkboxMargins.cyTopHeight;
+  int bottomMargin = checkboxMargins.cyBottomHeight;
+
+  int width = leftMargin + checkboxSize.cx + rightMargin;
+  int height = topMargin + checkboxSize.cy + bottomMargin;
+  SIZE ret;
+  ret.cx = width;
+  ret.cy = height;
+  return ret;
+}
+
+static SIZE GetCheckboxBGBounds(HANDLE theme, HDC hdc) {
+  MARGINS checkboxBGSizing = {0};
+  MARGINS checkboxBGContent = {0};
+  GetThemeMargins(theme, hdc, MENU_POPUPCHECKBACKGROUND, MCB_NORMAL,
+                  TMT_SIZINGMARGINS, nullptr, &checkboxBGSizing);
+  GetThemeMargins(theme, hdc, MENU_POPUPCHECKBACKGROUND, MCB_NORMAL,
+                  TMT_CONTENTMARGINS, nullptr, &checkboxBGContent);
+
+#define posdx(d) ((d) > 0 ? d : 0)
+
+  int dx =
+      posdx(checkboxBGContent.cxRightWidth - checkboxBGSizing.cxRightWidth) +
+      posdx(checkboxBGContent.cxLeftWidth - checkboxBGSizing.cxLeftWidth);
+  int dy =
+      posdx(checkboxBGContent.cyTopHeight - checkboxBGSizing.cyTopHeight) +
+      posdx(checkboxBGContent.cyBottomHeight - checkboxBGSizing.cyBottomHeight);
+
+#undef posdx
+
+  SIZE ret(GetCheckboxBGSize(theme, hdc));
+  ret.cx += dx;
+  ret.cy += dy;
+  return ret;
+}
+
+static SIZE GetGutterSize(HANDLE theme, HDC hdc) {
+  SIZE gutterSize;
+  GetThemePartSize(theme, hdc, MENU_POPUPGUTTER, 0, nullptr, TS_TRUE,
+                   &gutterSize);
+
+  SIZE checkboxBGSize(GetCheckboxBGBounds(theme, hdc));
+
+  SIZE itemSize;
+  GetThemePartSize(theme, hdc, MENU_POPUPITEM, MPI_NORMAL, nullptr, TS_TRUE,
+                   &itemSize);
+
+  // Figure out how big the menuitem's icon will be (if present) at current DPI
+  // Needs the system scale for consistency with Windows Theme API.
+  double scaleFactor = WinUtils::SystemScaleFactor();
+  int iconDevicePixels = NSToIntRound(16 * scaleFactor);
+  SIZE iconSize = {iconDevicePixels, iconDevicePixels};
+  // Not really sure what margins should be used here, but this seems to work in
+  // practice...
+  MARGINS margins = {0};
+  GetThemeMargins(theme, hdc, MENU_POPUPCHECKBACKGROUND, MCB_NORMAL,
+                  TMT_CONTENTMARGINS, nullptr, &margins);
+  iconSize.cx += margins.cxLeftWidth + margins.cxRightWidth;
+  iconSize.cy += margins.cyTopHeight + margins.cyBottomHeight;
+
+  int width = std::max(
+      itemSize.cx, std::max(iconSize.cx, checkboxBGSize.cx) + gutterSize.cx);
+  int height = std::max(itemSize.cy, std::max(iconSize.cy, checkboxBGSize.cy));
+
+  SIZE ret;
+  ret.cx = width;
+  ret.cy = height;
+  return ret;
+}
+
+SIZE nsNativeThemeWin::GetCachedGutterSize(HANDLE theme) {
+  if (mGutterSizeCacheValid) {
+    return mGutterSizeCache;
+  }
+
+  mGutterSizeCache = GetGutterSize(theme, nullptr);
+  mGutterSizeCacheValid = true;
+
+  return mGutterSizeCache;
+}
+
+/* DrawThemeBGRTLAware - render a theme part based on rtl state.
+ * Some widgets are not direction-neutral and need to be drawn reversed for
+ * RTL.  Windows provides a way to do this with SetLayout, but this reverses
+ * the entire drawing area of a given device context, which means that its
+ * use will also affect the positioning of the widget.  There are two ways
+ * to work around this:
+ *
+ * Option 1: Alter the position of the rect that we send so that we cancel
+ *           out the positioning effects of SetLayout
+ * Option 2: Create a memory DC with the widgetRect's dimensions, draw onto
+ *           that, and then transfer the results back to our DC
+ *
+ * This function tries to implement option 1, under the assumption that the
+ * correct way to reverse the effects of SetLayout is to translate the rect
+ * such that the offset from the DC bitmap's left edge to the old rect's
+ * left edge is equal to the offset from the DC bitmap's right edge to the
+ * new rect's right edge.  In other words,
+ * (oldRect.left + vpOrg.x) == ((dcBMP.width - vpOrg.x) - newRect.right)
+ */
+static HRESULT DrawThemeBGRTLAware(HANDLE aTheme, HDC aHdc, int aPart,
+                                   int aState, const RECT* aWidgetRect,
+                                   const RECT* aClipRect, bool aIsRtl) {
+  NS_ASSERTION(aTheme, "Bad theme handle.");
+  NS_ASSERTION(aHdc, "Bad hdc.");
+  NS_ASSERTION(aWidgetRect, "Bad rect.");
+  NS_ASSERTION(aClipRect, "Bad clip rect.");
+
+  if (!aIsRtl) {
+    return DrawThemeBackground(aTheme, aHdc, aPart, aState, aWidgetRect,
+                               aClipRect);
+  }
+
+  HGDIOBJ hObj = GetCurrentObject(aHdc, OBJ_BITMAP);
+  BITMAP bitmap;
+  POINT vpOrg;
+
+  if (hObj && GetObject(hObj, sizeof(bitmap), &bitmap) &&
+      GetViewportOrgEx(aHdc, &vpOrg)) {
+    RECT newWRect(*aWidgetRect);
+    newWRect.left = bitmap.bmWidth - (aWidgetRect->right + 2 * vpOrg.x);
+    newWRect.right = bitmap.bmWidth - (aWidgetRect->left + 2 * vpOrg.x);
+
+    RECT newCRect;
+    RECT* newCRectPtr = nullptr;
+
+    if (aClipRect) {
+      newCRect.top = aClipRect->top;
+      newCRect.bottom = aClipRect->bottom;
+      newCRect.left = bitmap.bmWidth - (aClipRect->right + 2 * vpOrg.x);
+      newCRect.right = bitmap.bmWidth - (aClipRect->left + 2 * vpOrg.x);
+      newCRectPtr = &newCRect;
+    }
+
+    SetLayout(aHdc, LAYOUT_RTL);
+    HRESULT hr = DrawThemeBackground(aTheme, aHdc, aPart, aState, &newWRect,
+                                     newCRectPtr);
+    SetLayout(aHdc, 0);
+    if (SUCCEEDED(hr)) {
+      return hr;
+    }
+  }
+  return DrawThemeBackground(aTheme, aHdc, aPart, aState, aWidgetRect,
+                             aClipRect);
+}
+
+/*
+ *  Caption button padding data - 'hot' button padding.
+ *  These areas are considered hot, in that they activate
+ *  a button when hovered or clicked. The button graphic
+ *  is drawn inside the padding border. Unrecognized themes
+ *  are treated as their recognized counterparts for now.
+ *                       left      top    right   bottom
+ *  classic min             1        2        0        1
+ *  classic max             0        2        1        1
+ *  classic close           1        2        2        1
+ *
+ *  aero basic min          1        2        0        2
+ *  aero basic max          0        2        1        2
+ *  aero basic close        1        2        1        2
+ *
+ *  'cold' button padding - generic button padding, should
+ *  be handled in css.
+ *                       left      top    right   bottom
+ *  classic min             0        0        0        0
+ *  classic max             0        0        0        0
+ *  classic close           0        0        0        0
+ *
+ *  aero basic min          0        0        1        0
+ *  aero basic max          1        0        0        0
+ *  aero basic close        0        0        0        0
+ */
+
+enum CaptionDesktopTheme {
+  CAPTION_CLASSIC = 0,
+  CAPTION_BASIC,
+};
+
+enum CaptionButton {
+  CAPTIONBUTTON_MINIMIZE = 0,
+  CAPTIONBUTTON_RESTORE,
+  CAPTIONBUTTON_CLOSE,
+};
+
+struct CaptionButtonPadding {
+  RECT hotPadding[3];
+};
+
+// RECT: left, top, right, bottom
+static CaptionButtonPadding buttonData[3] = {
+    {{{1, 2, 0, 1}, {0, 2, 1, 1}, {1, 2, 2, 1}}},
+    {{{1, 2, 0, 2}, {0, 2, 1, 2}, {1, 2, 2, 2}}},
+    {{{0, 2, 0, 2}, {0, 2, 1, 2}, {1, 2, 2, 2}}}};
+
+// Adds "hot" caption button padding to minimum widget size.
+static void AddPaddingRect(LayoutDeviceIntSize* aSize, CaptionButton button) {
+  if (!aSize) return;
+  RECT offset;
+  if (!nsUXThemeData::IsAppThemed())
+    offset = buttonData[CAPTION_CLASSIC].hotPadding[button];
+  else
+    offset = buttonData[CAPTION_BASIC].hotPadding[button];
+  aSize->width += offset.left + offset.right;
+  aSize->height += offset.top + offset.bottom;
+}
+
+// If we've added padding to the minimum widget size, offset
+// the area we draw into to compensate.
+static void OffsetBackgroundRect(RECT& rect, CaptionButton button) {
+  RECT offset;
+  if (!nsUXThemeData::IsAppThemed())
+    offset = buttonData[CAPTION_CLASSIC].hotPadding[button];
+  else
+    offset = buttonData[CAPTION_BASIC].hotPadding[button];
+  rect.left += offset.left;
+  rect.top += offset.top;
+  rect.right -= offset.right;
+  rect.bottom -= offset.bottom;
+}
+
+/*
+ * Notes on progress track and meter part constants:
+ * xp and up:
+ * PP_BAR(_VERT)            - base progress track
+ * PP_TRANSPARENTBAR(_VERT) - transparent progress track. this only works if
+ *                            the underlying surface supports alpha. otherwise
+ *                            theme lib's DrawThemeBackground falls back on
+ *                            opaque PP_BAR. we currently don't use this.
+ * PP_CHUNK(_VERT)          - xp progress meter. this does not draw an xp style
+ *                            progress w/chunks, it draws fill using the chunk
+ *                            graphic.
+ * vista and up:
+ * PP_FILL(_VERT)           - progress meter. these have four states/colors.
+ * PP_PULSEOVERLAY(_VERT)   - white reflection - an overlay, not sure what this
+ *                            is used for.
+ * PP_MOVEOVERLAY(_VERT)    - green pulse - the pulse effect overlay on
+ *                            determined progress bars. we also use this for
+ *                            indeterminate chunk.
+ *
+ * Notes on state constants:
+ * PBBS_NORMAL               - green progress
+ * PBBVS_PARTIAL/PBFVS_ERROR - red error progress
+ * PBFS_PAUSED               - yellow paused progress
+ *
+ * There is no common controls style indeterminate part on vista and up.
+ */
+
+/*
+ * Progress bar related constants. These values are found by experimenting and
+ * comparing against native widgets used by the system. They are very unlikely
+ * exact but try to not be too wrong.
+ */
+// The amount of time we animate progress meters parts across the frame.
+static const double kProgressDeterminateTimeSpan = 3.0;
+static const double kProgressIndeterminateTimeSpan = 5.0;
+// The width of the overlay used to animate the horizontal progress bar (Vista
+// and later).
+static const int32_t kProgressHorizontalOverlaySize = 120;
+// The height of the overlay used to animate the vertical progress bar (Vista
+// and later).
+static const int32_t kProgressVerticalOverlaySize = 45;
+// The height of the overlay used for the vertical indeterminate progress bar
+// (Vista and later).
+static const int32_t kProgressVerticalIndeterminateOverlaySize = 60;
+// The width of the overlay used to animate the indeterminate progress bar
+// (Windows Classic).
+static const int32_t kProgressClassicOverlaySize = 40;
+
+/*
+ * GetProgressOverlayStyle - returns the proper overlay part for themed
+ * progress bars based on os and orientation.
+ */
+static int32_t GetProgressOverlayStyle(bool aIsVertical) {
+  return aIsVertical ? PP_MOVEOVERLAYVERT : PP_MOVEOVERLAY;
+}
+
+/*
+ * GetProgressOverlaySize - returns the minimum width or height for themed
+ * progress bar overlays. This includes the width of indeterminate chunks
+ * and vista pulse overlays.
+ */
+static int32_t GetProgressOverlaySize(bool aIsVertical, bool aIsIndeterminate) {
+  if (aIsVertical) {
+    return aIsIndeterminate ? kProgressVerticalIndeterminateOverlaySize
+                            : kProgressVerticalOverlaySize;
+  }
+  return kProgressHorizontalOverlaySize;
+}
+
+/*
+ * IsProgressMeterFilled - Determines if a progress meter is at 100% fill based
+ * on a comparison of the current value and maximum.
+ */
+static bool IsProgressMeterFilled(nsIFrame* aFrame) {
+  NS_ENSURE_TRUE(aFrame, false);
+  nsIFrame* parentFrame = aFrame->GetParent();
+  NS_ENSURE_TRUE(parentFrame, false);
+  return nsNativeTheme::GetProgressValue(parentFrame) ==
+         nsNativeTheme::GetProgressMaxValue(parentFrame);
+}
+
+/*
+ * CalculateProgressOverlayRect - returns the padded overlay animation rect
+ * used in rendering progress bars. Resulting rects are used in rendering
+ * vista+ pulse overlays and indeterminate progress meters. Graphics should
+ * be rendered at the origin.
+ */
+RECT nsNativeThemeWin::CalculateProgressOverlayRect(nsIFrame* aFrame,
+                                                    RECT* aWidgetRect,
+                                                    bool aIsVertical,
+                                                    bool aIsIndeterminate,
+                                                    bool aIsClassic) {
+  NS_ASSERTION(aFrame, "bad frame pointer");
+  NS_ASSERTION(aWidgetRect, "bad rect pointer");
+
+  int32_t frameSize = aIsVertical ? aWidgetRect->bottom - aWidgetRect->top
+                                  : aWidgetRect->right - aWidgetRect->left;
+
+  // Recycle a set of progress pulse timers - these timers control the position
+  // of all progress overlays and indeterminate chunks that get rendered.
+  double span = aIsIndeterminate ? kProgressIndeterminateTimeSpan
+                                 : kProgressDeterminateTimeSpan;
+  TimeDuration period;
+  if (!aIsIndeterminate) {
+    if (TimeStamp::Now() >
+        (mProgressDeterminateTimeStamp + TimeDuration::FromSeconds(span))) {
+      mProgressDeterminateTimeStamp = TimeStamp::Now();
+    }
+    period = TimeStamp::Now() - mProgressDeterminateTimeStamp;
+  } else {
+    if (TimeStamp::Now() >
+        (mProgressIndeterminateTimeStamp + TimeDuration::FromSeconds(span))) {
+      mProgressIndeterminateTimeStamp = TimeStamp::Now();
+    }
+    period = TimeStamp::Now() - mProgressIndeterminateTimeStamp;
+  }
+
+  double percent = period / TimeDuration::FromSeconds(span);
+
+  if (!aIsVertical && IsFrameRTL(aFrame)) percent = 1 - percent;
+
+  RECT overlayRect = *aWidgetRect;
+  int32_t overlaySize;
+  if (!aIsClassic) {
+    overlaySize = GetProgressOverlaySize(aIsVertical, aIsIndeterminate);
+  } else {
+    overlaySize = kProgressClassicOverlaySize;
+  }
+
+  // Calculate a bounds that is larger than the meters frame such that the
+  // overlay starts and ends completely off the edge of the frame:
+  // [overlay][frame][overlay]
+  // This also yields a nice delay on rotation. Use overlaySize as the minimum
+  // size for [overlay] based on the graphics dims. If [frame] is larger, use
+  // the frame size instead.
+  int trackWidth = frameSize > overlaySize ? frameSize : overlaySize;
+  if (!aIsVertical) {
+    int xPos = aWidgetRect->left - trackWidth;
+    xPos += (int)ceil(((double)(trackWidth * 2) * percent));
+    overlayRect.left = xPos;
+    overlayRect.right = xPos + overlaySize;
+  } else {
+    int yPos = aWidgetRect->bottom + trackWidth;
+    yPos -= (int)ceil(((double)(trackWidth * 2) * percent));
+    overlayRect.bottom = yPos;
+    overlayRect.top = yPos - overlaySize;
+  }
+  return overlayRect;
+}
+
+/*
+ * DrawProgressMeter - render an appropriate progress meter based on progress
+ * meter style, orientation, and os. Note, this does not render the underlying
+ * progress track.
+ *
+ * @param aFrame       the widget frame
+ * @param aAppearance  type of widget
+ * @param aTheme       progress theme handle
+ * @param aHdc         hdc returned by gfxWindowsNativeDrawing
+ * @param aPart        the PP_X progress part
+ * @param aState       the theme state
+ * @param aWidgetRect  bounding rect for the widget
+ * @param aClipRect    dirty rect that needs drawing.
+ * @param aAppUnits    app units per device pixel
+ */
+void nsNativeThemeWin::DrawThemedProgressMeter(
+    nsIFrame* aFrame, StyleAppearance aAppearance, HANDLE aTheme, HDC aHdc,
+    int aPart, int aState, RECT* aWidgetRect, RECT* aClipRect) {
+  if (!aFrame || !aTheme || !aHdc) return;
+
+  NS_ASSERTION(aWidgetRect, "bad rect pointer");
+  NS_ASSERTION(aClipRect, "bad clip rect pointer");
+
+  RECT adjWidgetRect, adjClipRect;
+  adjWidgetRect = *aWidgetRect;
+  adjClipRect = *aClipRect;
+
+  nsIFrame* parentFrame = aFrame->GetParent();
+  if (!parentFrame) {
+    // We have no parent to work with, just bail.
+    NS_WARNING("No parent frame for progress rendering. Can't paint.");
+    return;
+  }
+
+  EventStates eventStates = GetContentState(parentFrame, aAppearance);
+  bool vertical = IsVerticalProgress(parentFrame);
+  bool indeterminate = IsIndeterminateProgress(parentFrame, eventStates);
+  bool animate = indeterminate;
+
+  // Vista and up progress meter is fill style, rendered here. We render
+  // the pulse overlay in the follow up section below.
+  DrawThemeBackground(aTheme, aHdc, aPart, aState, &adjWidgetRect,
+                      &adjClipRect);
+  if (!IsProgressMeterFilled(aFrame)) {
+    animate = true;
+  }
+
+  if (animate) {
+    // Indeterminate rendering
+    int32_t overlayPart = GetProgressOverlayStyle(vertical);
+    RECT overlayRect = CalculateProgressOverlayRect(
+        aFrame, &adjWidgetRect, vertical, indeterminate, false);
+    DrawThemeBackground(aTheme, aHdc, overlayPart, aState, &overlayRect,
+                        &adjClipRect);
+
+    if (!QueueAnimatedContentForRefresh(aFrame->GetContent(), 60)) {
+      NS_WARNING("unable to animate progress widget!");
+    }
+  }
+}
+
+LayoutDeviceIntMargin nsNativeThemeWin::GetCachedWidgetBorder(
+    HTHEME aTheme, nsUXThemeClass aThemeClass, StyleAppearance aAppearance,
+    int32_t aPart, int32_t aState) {
+  int32_t cacheIndex = aThemeClass * THEME_PART_DISTINCT_VALUE_COUNT + aPart;
+  int32_t cacheBitIndex = cacheIndex / 8;
+  uint8_t cacheBit = 1u << (cacheIndex % 8);
+
+  if (mBorderCacheValid[cacheBitIndex] & cacheBit) {
+    return mBorderCache[cacheIndex];
+  }
+
+  // Get our info.
+  RECT outerRect;  // Create a fake outer rect.
+  outerRect.top = outerRect.left = 100;
+  outerRect.right = outerRect.bottom = 200;
+  RECT contentRect(outerRect);
+  HRESULT res = GetThemeBackgroundContentRect(aTheme, nullptr, aPart, aState,
+                                              &outerRect, &contentRect);
+
+  if (FAILED(res)) {
+    return LayoutDeviceIntMargin();
+  }
+
+  // Now compute the delta in each direction and place it in our
+  // nsIntMargin struct.
+  LayoutDeviceIntMargin result;
+  result.top = contentRect.top - outerRect.top;
+  result.bottom = outerRect.bottom - contentRect.bottom;
+  result.left = contentRect.left - outerRect.left;
+  result.right = outerRect.right - contentRect.right;
+
+  mBorderCacheValid[cacheBitIndex] |= cacheBit;
+  mBorderCache[cacheIndex] = result;
+
+  return result;
+}
+
+nsresult nsNativeThemeWin::GetCachedMinimumWidgetSize(
+    nsIFrame* aFrame, HANDLE aTheme, nsUXThemeClass aThemeClass,
+    StyleAppearance aAppearance, int32_t aPart, int32_t aState,
+    THEMESIZE aSizeReq, mozilla::LayoutDeviceIntSize* aResult) {
+  int32_t cachePart = aPart;
+
+  if (aAppearance == StyleAppearance::Button && aSizeReq == TS_MIN) {
+    // In practice, StyleAppearance::Button is the only widget type which has an
+    // aSizeReq that varies for us, and it can only be TS_MIN or TS_TRUE. Just
+    // stuff that extra bit into the aPart part of the cache, since BP_Count is
+    // well below THEME_PART_DISTINCT_VALUE_COUNT anyway.
+    cachePart = BP_Count;
+  }
+
+  MOZ_ASSERT(aPart < THEME_PART_DISTINCT_VALUE_COUNT);
+  int32_t cacheIndex =
+      aThemeClass * THEME_PART_DISTINCT_VALUE_COUNT + cachePart;
+  int32_t cacheBitIndex = cacheIndex / 8;
+  uint8_t cacheBit = 1u << (cacheIndex % 8);
+
+  if (mMinimumWidgetSizeCacheValid[cacheBitIndex] & cacheBit) {
+    *aResult = mMinimumWidgetSizeCache[cacheIndex];
+    return NS_OK;
+  }
+
+  HDC hdc = ::GetDC(NULL);
+  if (!hdc) {
+    return NS_ERROR_FAILURE;
+  }
+
+  SIZE sz;
+  GetThemePartSize(aTheme, hdc, aPart, aState, nullptr, aSizeReq, &sz);
+  aResult->width = sz.cx;
+  aResult->height = sz.cy;
+
+  switch (aAppearance) {
+    case StyleAppearance::SpinnerUpbutton:
+    case StyleAppearance::SpinnerDownbutton:
+      aResult->width++;
+      aResult->height = aResult->height / 2 + 1;
+      break;
+
+    case StyleAppearance::Menuseparator: {
+      SIZE gutterSize(GetGutterSize(aTheme, hdc));
+      aResult->width += gutterSize.cx;
+      break;
+    }
+
+    case StyleAppearance::Menuarrow:
+      // Use the width of the arrow glyph as padding. See the drawing
+      // code for details.
+      aResult->width *= 2;
+      break;
+
+    default:
+      break;
+  }
+
+  ::ReleaseDC(nullptr, hdc);
+
+  mMinimumWidgetSizeCacheValid[cacheBitIndex] |= cacheBit;
+  mMinimumWidgetSizeCache[cacheIndex] = *aResult;
+
+  return NS_OK;
+}
+
+mozilla::Maybe<nsUXThemeClass> nsNativeThemeWin::GetThemeClass(
+    StyleAppearance aAppearance) {
+  switch (aAppearance) {
+    case StyleAppearance::Button:
+    case StyleAppearance::Radio:
+    case StyleAppearance::Checkbox:
+    case StyleAppearance::Groupbox:
+      return Some(eUXButton);
+    case StyleAppearance::NumberInput:
+    case StyleAppearance::Textfield:
+    case StyleAppearance::Textarea:
+    case StyleAppearance::FocusOutline:
+      return Some(eUXEdit);
+    case StyleAppearance::Tooltip:
+      return Some(eUXTooltip);
+    case StyleAppearance::Toolbox:
+      return Some(eUXRebar);
+    case StyleAppearance::MozWinMediaToolbox:
+      return Some(eUXMediaRebar);
+    case StyleAppearance::MozWinCommunicationsToolbox:
+      return Some(eUXCommunicationsRebar);
+    case StyleAppearance::MozWinBrowsertabbarToolbox:
+      return Some(eUXBrowserTabBarRebar);
+    case StyleAppearance::Toolbar:
+    case StyleAppearance::Toolbarbutton:
+    case StyleAppearance::Separator:
+      return Some(eUXToolbar);
+    case StyleAppearance::ProgressBar:
+    case StyleAppearance::Progresschunk:
+      return Some(eUXProgress);
+    case StyleAppearance::Tab:
+    case StyleAppearance::Tabpanel:
+    case StyleAppearance::Tabpanels:
+      return Some(eUXTab);
+    case StyleAppearance::ScrollbarVertical:
+    case StyleAppearance::ScrollbarHorizontal:
+    case StyleAppearance::ScrollbarbuttonUp:
+    case StyleAppearance::ScrollbarbuttonDown:
+    case StyleAppearance::ScrollbarbuttonLeft:
+    case StyleAppearance::ScrollbarbuttonRight:
+    case StyleAppearance::ScrollbarthumbVertical:
+    case StyleAppearance::ScrollbarthumbHorizontal:
+    case StyleAppearance::Scrollcorner:
+      return Some(eUXScrollbar);
+    case StyleAppearance::Range:
+    case StyleAppearance::RangeThumb:
+      return Some(eUXTrackbar);
+    case StyleAppearance::SpinnerUpbutton:
+    case StyleAppearance::SpinnerDownbutton:
+      return Some(eUXSpin);
+    case StyleAppearance::Statusbar:
+    case StyleAppearance::Statusbarpanel:
+    case StyleAppearance::Resizerpanel:
+    case StyleAppearance::Resizer:
+      return Some(eUXStatus);
+    case StyleAppearance::Menulist:
+    case StyleAppearance::MenulistButton:
+    case StyleAppearance::MozMenulistArrowButton:
+      return Some(eUXCombobox);
+    case StyleAppearance::Treeheadercell:
+    case StyleAppearance::Treeheadersortarrow:
+      return Some(eUXHeader);
+    case StyleAppearance::Listbox:
+    case StyleAppearance::Treeview:
+    case StyleAppearance::Treetwistyopen:
+    case StyleAppearance::Treeitem:
+      return Some(eUXListview);
+    case StyleAppearance::Menubar:
+    case StyleAppearance::Menupopup:
+    case StyleAppearance::Menuitem:
+    case StyleAppearance::Checkmenuitem:
+    case StyleAppearance::Radiomenuitem:
+    case StyleAppearance::Menucheckbox:
+    case StyleAppearance::Menuradio:
+    case StyleAppearance::Menuseparator:
+    case StyleAppearance::Menuarrow:
+    case StyleAppearance::Menuimage:
+    case StyleAppearance::Menuitemtext:
+      return Some(eUXMenu);
+    case StyleAppearance::MozWindowTitlebar:
+    case StyleAppearance::MozWindowTitlebarMaximized:
+    case StyleAppearance::MozWindowFrameLeft:
+    case StyleAppearance::MozWindowFrameRight:
+    case StyleAppearance::MozWindowFrameBottom:
+    case StyleAppearance::MozWindowButtonClose:
+    case StyleAppearance::MozWindowButtonMinimize:
+    case StyleAppearance::MozWindowButtonMaximize:
+    case StyleAppearance::MozWindowButtonRestore:
+    case StyleAppearance::MozWindowButtonBox:
+    case StyleAppearance::MozWindowButtonBoxMaximized:
+    case StyleAppearance::MozWinGlass:
+    case StyleAppearance::MozWinBorderlessGlass:
+      return Some(eUXWindowFrame);
+    default:
+      return Nothing();
+  }
+}
+
+HANDLE
+nsNativeThemeWin::GetTheme(StyleAppearance aAppearance) {
+  mozilla::Maybe<nsUXThemeClass> themeClass = GetThemeClass(aAppearance);
+  if (themeClass.isNothing()) {
+    return nullptr;
+  }
+  return nsUXThemeData::GetTheme(themeClass.value());
+}
+
+int32_t nsNativeThemeWin::StandardGetState(nsIFrame* aFrame,
+                                           StyleAppearance aAppearance,
+                                           bool wantFocused) {
+  EventStates eventState = GetContentState(aFrame, aAppearance);
+  if (eventState.HasAllStates(NS_EVENT_STATE_HOVER | NS_EVENT_STATE_ACTIVE)) {
+    return TS_ACTIVE;
+  }
+  if (eventState.HasState(NS_EVENT_STATE_HOVER)) {
+    return TS_HOVER;
+  }
+  if (wantFocused) {
+    if (eventState.HasState(NS_EVENT_STATE_FOCUSRING)) {
+      return TS_FOCUSED;
+    }
+    // On Windows, focused buttons are always drawn as such by the native
+    // theme, that's why we check NS_EVENT_STATE_FOCUS instead of
+    // NS_EVENT_STATE_FOCUSRING.
+    if (aAppearance == StyleAppearance::Button &&
+        eventState.HasState(NS_EVENT_STATE_FOCUS)) {
+      return TS_FOCUSED;
+    }
+  }
+
+  return TS_NORMAL;
+}
+
+bool nsNativeThemeWin::IsMenuActive(nsIFrame* aFrame,
+                                    StyleAppearance aAppearance) {
+  nsIContent* content = aFrame->GetContent();
+  if (content->IsXULElement() &&
+      content->NodeInfo()->Equals(nsGkAtoms::richlistitem))
+    return CheckBooleanAttr(aFrame, nsGkAtoms::selected);
+
+  return CheckBooleanAttr(aFrame, nsGkAtoms::menuactive);
+}
+
+/**
+ * aPart is filled in with the UXTheme part code. On return, values > 0
+ * are the actual UXTheme part code; -1 means the widget will be drawn by
+ * us; 0 means that we should use part code 0, which isn't a real part code
+ * but elicits some kind of default behaviour from UXTheme when drawing
+ * (but isThemeBackgroundPartiallyTransparent may not work).
+ */
+nsresult nsNativeThemeWin::GetThemePartAndState(nsIFrame* aFrame,
+                                                StyleAppearance aAppearance,
+                                                int32_t& aPart,
+                                                int32_t& aState) {
+  switch (aAppearance) {
+    case StyleAppearance::Button: {
+      aPart = BP_BUTTON;
+      if (!aFrame) {
+        aState = TS_NORMAL;
+        return NS_OK;
+      }
+
+      EventStates eventState = GetContentState(aFrame, aAppearance);
+      if (IsDisabled(aFrame, eventState)) {
+        aState = TS_DISABLED;
+        return NS_OK;
+      } else if (IsOpenButton(aFrame) || IsCheckedButton(aFrame)) {
+        aState = TS_ACTIVE;
+        return NS_OK;
+      }
+
+      aState = StandardGetState(aFrame, aAppearance, true);
+
+      // Check for default dialog buttons.  These buttons should always look
+      // focused.
+      if (aState == TS_NORMAL && IsDefaultButton(aFrame)) aState = TS_FOCUSED;
+      return NS_OK;
+    }
+    case StyleAppearance::Checkbox:
+    case StyleAppearance::Radio: {
+      bool isCheckbox = (aAppearance == StyleAppearance::Checkbox);
+      aPart = isCheckbox ? BP_CHECKBOX : BP_RADIO;
+
+      enum InputState { UNCHECKED = 0, CHECKED, INDETERMINATE };
+      InputState inputState = UNCHECKED;
+
+      if (!aFrame) {
+        aState = TS_NORMAL;
+      } else {
+        if (GetCheckedOrSelected(aFrame, !isCheckbox)) {
+          inputState = CHECKED;
+        }
+        if (isCheckbox && GetIndeterminate(aFrame)) {
+          inputState = INDETERMINATE;
+        }
+
+        EventStates eventState = GetContentState(aFrame, aAppearance);
+        if (IsDisabled(aFrame, eventState)) {
+          aState = TS_DISABLED;
+        } else {
+          aState = StandardGetState(aFrame, aAppearance, false);
+        }
+      }
+
+      // 4 unchecked states, 4 checked states, 4 indeterminate states.
+      aState += inputState * 4;
+      return NS_OK;
+    }
+    case StyleAppearance::Groupbox: {
+      aPart = BP_GROUPBOX;
+      aState = TS_NORMAL;
+      // Since we don't support groupbox disabled and GBS_DISABLED looks the
+      // same as GBS_NORMAL don't bother supporting GBS_DISABLED.
+      return NS_OK;
+    }
+    case StyleAppearance::NumberInput:
+    case StyleAppearance::Textfield:
+    case StyleAppearance::Textarea: {
+      EventStates eventState = GetContentState(aFrame, aAppearance);
+
+      /* Note: the NOSCROLL type has a rounded corner in each corner.  The more
+       * specific HSCROLL, VSCROLL, HVSCROLL types have side and/or top/bottom
+       * edges rendered as straight horizontal lines with sharp corners to
+       * accommodate a scrollbar.  However, the scrollbar gets rendered on top
+       * of this for us, so we don't care, and can just use NOSCROLL here.
+       */
+      aPart = TFP_EDITBORDER_NOSCROLL;
+
+      if (!aFrame) {
+        aState = TFS_EDITBORDER_NORMAL;
+      } else if (IsDisabled(aFrame, eventState)) {
+        aState = TFS_EDITBORDER_DISABLED;
+      } else if (IsReadOnly(aFrame)) {
+        /* no special read-only state */
+        aState = TFS_EDITBORDER_NORMAL;
+      } else {
+        nsIContent* content = aFrame->GetContent();
+
+        /* XUL textboxes don't get focused themselves, because they have child
+         * html:input.. but we can check the XUL focused attributes on them
+         */
+        if (content && content->IsXULElement() && IsFocused(aFrame))
+          aState = TFS_EDITBORDER_FOCUSED;
+        else if (eventState.HasAtLeastOneOfStates(NS_EVENT_STATE_ACTIVE |
+                                                  NS_EVENT_STATE_FOCUSRING))
+          aState = TFS_EDITBORDER_FOCUSED;
+        else if (eventState.HasState(NS_EVENT_STATE_HOVER))
+          aState = TFS_EDITBORDER_HOVER;
+        else
+          aState = TFS_EDITBORDER_NORMAL;
+      }
+
+      return NS_OK;
+    }
+    case StyleAppearance::FocusOutline: {
+      // XXX the EDITBORDER values don't respect DTBG_OMITCONTENT
+      aPart = TFP_TEXTFIELD;  // TFP_EDITBORDER_NOSCROLL;
+      aState = TS_FOCUSED;    // TFS_EDITBORDER_FOCUSED;
+      return NS_OK;
+    }
+    case StyleAppearance::Tooltip: {
+      aPart = TTP_STANDARD;
+      aState = TS_NORMAL;
+      return NS_OK;
+    }
+    case StyleAppearance::ProgressBar: {
+      bool vertical = IsVerticalProgress(aFrame);
+      aPart = vertical ? PP_BARVERT : PP_BAR;
+      aState = PBBS_NORMAL;
+      return NS_OK;
+    }
+    case StyleAppearance::Progresschunk: {
+      nsIFrame* parentFrame = aFrame->GetParent();
+      if (IsVerticalProgress(parentFrame)) {
+        aPart = PP_FILLVERT;
+      } else {
+        aPart = PP_FILL;
+      }
+
+      aState = PBBVS_NORMAL;
+      return NS_OK;
+    }
+    case StyleAppearance::Toolbarbutton: {
+      aPart = BP_BUTTON;
+      if (!aFrame) {
+        aState = TS_NORMAL;
+        return NS_OK;
+      }
+
+      EventStates eventState = GetContentState(aFrame, aAppearance);
+      if (IsDisabled(aFrame, eventState)) {
+        aState = TS_DISABLED;
+        return NS_OK;
+      }
+      if (IsOpenButton(aFrame)) {
+        aState = TS_ACTIVE;
+        return NS_OK;
+      }
+
+      if (eventState.HasAllStates(NS_EVENT_STATE_HOVER | NS_EVENT_STATE_ACTIVE))
+        aState = TS_ACTIVE;
+      else if (eventState.HasState(NS_EVENT_STATE_HOVER)) {
+        if (IsCheckedButton(aFrame))
+          aState = TB_HOVER_CHECKED;
+        else
+          aState = TS_HOVER;
+      } else {
+        if (IsCheckedButton(aFrame))
+          aState = TB_CHECKED;
+        else
+          aState = TS_NORMAL;
+      }
+
+      return NS_OK;
+    }
+    case StyleAppearance::Separator: {
+      aPart = TP_SEPARATOR;
+      aState = TS_NORMAL;
+      return NS_OK;
+    }
+    case StyleAppearance::ScrollbarbuttonUp:
+    case StyleAppearance::ScrollbarbuttonDown:
+    case StyleAppearance::ScrollbarbuttonLeft:
+    case StyleAppearance::ScrollbarbuttonRight: {
+      aPart = SP_BUTTON;
+      aState = (int(aAppearance) - int(StyleAppearance::ScrollbarbuttonUp)) * 4;
+      EventStates eventState = GetContentState(aFrame, aAppearance);
+      if (!aFrame)
+        aState += TS_NORMAL;
+      else if (IsDisabled(aFrame, eventState))
+        aState += TS_DISABLED;
+      else {
+        nsIFrame* parent = aFrame->GetParent();
+        EventStates parentState = GetContentState(
+            parent, parent->StyleDisplay()->EffectiveAppearance());
+        if (eventState.HasAllStates(NS_EVENT_STATE_HOVER |
+                                    NS_EVENT_STATE_ACTIVE))
+          aState += TS_ACTIVE;
+        else if (eventState.HasState(NS_EVENT_STATE_HOVER))
+          aState += TS_HOVER;
+        else if (parentState.HasState(NS_EVENT_STATE_HOVER))
+          aState =
+              (int(aAppearance) - int(StyleAppearance::ScrollbarbuttonUp)) +
+              SP_BUTTON_IMPLICIT_HOVER_BASE;
+        else
+          aState += TS_NORMAL;
+      }
+      return NS_OK;
+    }
+    case StyleAppearance::ScrollbarHorizontal:
+    case StyleAppearance::ScrollbarVertical: {
+      aPart = (aAppearance == StyleAppearance::ScrollbarHorizontal)
+                  ? SP_TRACKSTARTHOR
+                  : SP_TRACKSTARTVERT;
+      aState = TS_NORMAL;
+      return NS_OK;
+    }
+    case StyleAppearance::ScrollbarthumbHorizontal:
+    case StyleAppearance::ScrollbarthumbVertical: {
+      aPart = (aAppearance == StyleAppearance::ScrollbarthumbHorizontal)
+                  ? SP_THUMBHOR
+                  : SP_THUMBVERT;
+      EventStates eventState = GetContentState(aFrame, aAppearance);
+      if (!aFrame)
+        aState = TS_NORMAL;
+      else if (IsDisabled(aFrame, eventState))
+        aState = TS_DISABLED;
+      else {
+        if (eventState.HasState(
+                NS_EVENT_STATE_ACTIVE))  // Hover is not also a requirement for
+                                         // the thumb, since the drag is not
+                                         // canceled when you move outside the
+                                         // thumb.
+          aState = TS_ACTIVE;
+        else if (eventState.HasState(NS_EVENT_STATE_HOVER))
+          aState = TS_HOVER;
+        else
+          aState = TS_NORMAL;
+      }
+      return NS_OK;
+    }
+    case StyleAppearance::Range: {
+      if (IsRangeHorizontal(aFrame)) {
+        aPart = TKP_TRACK;
+        aState = TRS_NORMAL;
+      } else {
+        aPart = TKP_TRACKVERT;
+        aState = TRVS_NORMAL;
+      }
+      return NS_OK;
+    }
+    case StyleAppearance::RangeThumb: {
+      if (IsRangeHorizontal(aFrame)) {
+        aPart = TKP_THUMBBOTTOM;
+      } else {
+        aPart = IsFrameRTL(aFrame) ? TKP_THUMBLEFT : TKP_THUMBRIGHT;
+      }
+      EventStates eventState = GetContentState(aFrame, aAppearance);
+      if (!aFrame)
+        aState = TS_NORMAL;
+      else if (IsDisabled(aFrame, eventState)) {
+        aState = TKP_DISABLED;
+      } else {
+        if (eventState.HasState(
+                NS_EVENT_STATE_ACTIVE))  // Hover is not also a requirement for
+                                         // the thumb, since the drag is not
+                                         // canceled when you move outside the
+                                         // thumb.
+          aState = TS_ACTIVE;
+        else if (eventState.HasState(NS_EVENT_STATE_FOCUSRING))
+          aState = TKP_FOCUSED;
+        else if (eventState.HasState(NS_EVENT_STATE_HOVER))
+          aState = TS_HOVER;
+        else
+          aState = TS_NORMAL;
+      }
+      return NS_OK;
+    }
+    case StyleAppearance::SpinnerUpbutton:
+    case StyleAppearance::SpinnerDownbutton: {
+      aPart = (aAppearance == StyleAppearance::SpinnerUpbutton) ? SPNP_UP
+                                                                : SPNP_DOWN;
+      EventStates eventState = GetContentState(aFrame, aAppearance);
+      if (!aFrame)
+        aState = TS_NORMAL;
+      else if (IsDisabled(aFrame, eventState))
+        aState = TS_DISABLED;
+      else
+        aState = StandardGetState(aFrame, aAppearance, false);
+      return NS_OK;
+    }
+    case StyleAppearance::Toolbox:
+    case StyleAppearance::MozWinMediaToolbox:
+    case StyleAppearance::MozWinCommunicationsToolbox:
+    case StyleAppearance::MozWinBrowsertabbarToolbox:
+    case StyleAppearance::Statusbar:
+    case StyleAppearance::Scrollcorner: {
+      aState = 0;
+      aPart = RP_BACKGROUND;
+      return NS_OK;
+    }
+    case StyleAppearance::Toolbar: {
+      // Use -1 to indicate we don't wish to have the theme background drawn
+      // for this item. We will pass any nessessary information via aState,
+      // and will render the item using separate code.
+      aPart = -1;
+      aState = 0;
+      if (aFrame) {
+        nsIContent* content = aFrame->GetContent();
+        nsIContent* parent = content->GetParent();
+        // XXXzeniko hiding the first toolbar will result in an unwanted margin
+        if (parent && parent->GetFirstChild() == content) {
+          aState = 1;
+        }
+      }
+      return NS_OK;
+    }
+    case StyleAppearance::Statusbarpanel:
+    case StyleAppearance::Resizerpanel:
+    case StyleAppearance::Resizer: {
+      switch (aAppearance) {
+        case StyleAppearance::Statusbarpanel:
+          aPart = 1;
+          break;
+        case StyleAppearance::Resizerpanel:
+          aPart = 2;
+          break;
+        case StyleAppearance::Resizer:
+          aPart = 3;
+          break;
+        default:
+          MOZ_ASSERT_UNREACHABLE("Oops, we're missing a case");
+          aPart = 1;  // just something valid
+      }
+      aState = TS_NORMAL;
+      return NS_OK;
+    }
+    case StyleAppearance::Treeview:
+    case StyleAppearance::Listbox: {
+      aPart = TREEVIEW_BODY;
+      aState = TS_NORMAL;
+      return NS_OK;
+    }
+    case StyleAppearance::Tabpanels: {
+      aPart = TABP_PANELS;
+      aState = TS_NORMAL;
+      return NS_OK;
+    }
+    case StyleAppearance::Tabpanel: {
+      aPart = TABP_PANEL;
+      aState = TS_NORMAL;
+      return NS_OK;
+    }
+    case StyleAppearance::Tab: {
+      aPart = TABP_TAB;
+      if (!aFrame) {
+        aState = TS_NORMAL;
+        return NS_OK;
+      }
+
+      EventStates eventState = GetContentState(aFrame, aAppearance);
+      if (IsDisabled(aFrame, eventState)) {
+        aState = TS_DISABLED;
+        return NS_OK;
+      }
+
+      if (IsSelectedTab(aFrame)) {
+        aPart = TABP_TAB_SELECTED;
+        aState = TS_ACTIVE;  // The selected tab is always "pressed".
+      } else
+        aState = StandardGetState(aFrame, aAppearance, true);
+
+      return NS_OK;
+    }
+    case StyleAppearance::Treeheadersortarrow: {
+      // XXX Probably will never work due to a bug in the Luna theme.
+      aPart = 4;
+      aState = 1;
+      return NS_OK;
+    }
+    case StyleAppearance::Treeheadercell: {
+      aPart = 1;
+      if (!aFrame) {
+        aState = TS_NORMAL;
+        return NS_OK;
+      }
+
+      aState = StandardGetState(aFrame, aAppearance, true);
+
+      return NS_OK;
+    }
+    case StyleAppearance::MenulistButton:
+    case StyleAppearance::Menulist: {
+      nsIContent* content = aFrame->GetContent();
+      bool useDropBorder = content && content->IsHTMLElement();
+      EventStates eventState = GetContentState(aFrame, aAppearance);
+
+      /* On Vista/Win7, we use CBP_DROPBORDER instead of DROPFRAME for HTML
+       * content or for editable menulists; this gives us the thin outline,
+       * instead of the gradient-filled background */
+      if (useDropBorder)
+        aPart = CBP_DROPBORDER;
+      else
+        aPart = CBP_DROPFRAME;
+
+      if (IsDisabled(aFrame, eventState)) {
+        aState = TS_DISABLED;
+      } else if (IsReadOnly(aFrame)) {
+        aState = TS_NORMAL;
+      } else if (IsOpenButton(aFrame)) {
+        aState = TS_ACTIVE;
+      } else {
+        if (useDropBorder && (eventState.HasState(NS_EVENT_STATE_FOCUSRING) ||
+                              IsFocused(aFrame)))
+          aState = TS_ACTIVE;
+        else if (eventState.HasAllStates(NS_EVENT_STATE_HOVER |
+                                         NS_EVENT_STATE_ACTIVE))
+          aState = TS_ACTIVE;
+        else if (eventState.HasState(NS_EVENT_STATE_HOVER))
+          aState = TS_HOVER;
+        else
+          aState = TS_NORMAL;
+      }
+
+      return NS_OK;
+    }
+    case StyleAppearance::MozMenulistArrowButton: {
+      bool isHTML = IsHTMLContent(aFrame);
+      nsIFrame* parentFrame = aFrame->GetParent();
+      bool isMenulist = !isHTML && parentFrame->IsMenuFrame();
+      bool isOpen = false;
+
+      // HTML select and XUL menulist dropdown buttons get state from the
+      // parent.
+      if (isHTML || isMenulist) aFrame = parentFrame;
+
+      EventStates eventState = GetContentState(aFrame, aAppearance);
+      aPart = CBP_DROPMARKER_VISTA;
+
+      // For HTML controls with author styling, we should fall
+      // back to the old dropmarker style to avoid clashes with
+      // author-specified backgrounds and borders (bug #441034)
+      if (isHTML && IsWidgetStyled(aFrame->PresContext(), aFrame,
+                                   StyleAppearance::Menulist))
+        aPart = CBP_DROPMARKER;
+
+      if (IsDisabled(aFrame, eventState)) {
+        aState = TS_DISABLED;
+        return NS_OK;
+      }
+
+      if (isHTML) {
+        nsComboboxControlFrame* ccf = do_QueryFrame(aFrame);
+        isOpen = (ccf && ccf->IsDroppedDownOrHasParentPopup());
+      } else
+        isOpen = IsOpenButton(aFrame);
+
+      if (isHTML) {
+        if (isOpen) {
+          /* Hover is propagated, but we need to know whether we're hovering
+           * just the combobox frame, not the dropdown frame. But, we can't get
+           * that information, since hover is on the content node, and they
+           * share the same content node.  So, instead, we cheat -- if the
+           * dropdown is open, we always show the hover state.  This looks fine
+           * in practice.
+           */
+          aState = TS_HOVER;
+          return NS_OK;
+        }
+      } else {
+        /* The dropdown indicator on a menulist button in chrome is not given a
+         * hover effect. When the frame isn't isn't HTML content, we cheat and
+         * force the dropdown state to be normal. (Bug 430434)
+         */
+        aState = TS_NORMAL;
+        return NS_OK;
+      }
+
+      aState = TS_NORMAL;
+
+      // Dropdown button active state doesn't need :hover.
+      if (eventState.HasState(NS_EVENT_STATE_ACTIVE)) {
+        if (isOpen && (isHTML || isMenulist)) {
+          // XXX Button should look active until the mouse is released, but
+          //     without making it look active when the popup is clicked.
+          return NS_OK;
+        }
+        aState = TS_ACTIVE;
+      } else if (eventState.HasState(NS_EVENT_STATE_HOVER)) {
+        // No hover effect for XUL menulists and autocomplete dropdown buttons
+        // while the dropdown menu is open.
+        if (isOpen) {
+          // XXX HTML select dropdown buttons should have the hover effect when
+          //     hovering the combobox frame, but not the popup frame.
+          return NS_OK;
+        }
+        aState = TS_HOVER;
+      }
+      return NS_OK;
+    }
+    case StyleAppearance::Menupopup: {
+      aPart = MENU_POPUPBACKGROUND;
+      aState = MB_ACTIVE;
+      return NS_OK;
+    }
+    case StyleAppearance::Menuitem:
+    case StyleAppearance::Checkmenuitem:
+    case StyleAppearance::Radiomenuitem: {
+      bool isTopLevel = false;
+      bool isOpen = false;
+      bool isHover = false;
+      nsMenuFrame* menuFrame = do_QueryFrame(aFrame);
+      EventStates eventState = GetContentState(aFrame, aAppearance);
+
+      isTopLevel = IsTopLevelMenu(aFrame);
+
+      if (menuFrame) isOpen = menuFrame->IsOpen();
+
+      isHover = IsMenuActive(aFrame, aAppearance);
+
+      if (isTopLevel) {
+        aPart = MENU_BARITEM;
+
+        if (isOpen)
+          aState = MBI_PUSHED;
+        else if (isHover)
+          aState = MBI_HOT;
+        else
+          aState = MBI_NORMAL;
+
+        // the disabled states are offset by 3
+        if (IsDisabled(aFrame, eventState)) aState += 3;
+      } else {
+        aPart = MENU_POPUPITEM;
+
+        if (isHover)
+          aState = MPI_HOT;
+        else
+          aState = MPI_NORMAL;
+
+        // the disabled states are offset by 2
+        if (IsDisabled(aFrame, eventState)) aState += 2;
+      }
+
+      return NS_OK;
+    }
+    case StyleAppearance::Menuseparator:
+      aPart = MENU_POPUPSEPARATOR;
+      aState = 0;
+      return NS_OK;
+    case StyleAppearance::Menuarrow: {
+      aPart = MENU_POPUPSUBMENU;
+      EventStates eventState = GetContentState(aFrame, aAppearance);
+      aState = IsDisabled(aFrame, eventState) ? MSM_DISABLED : MSM_NORMAL;
+      return NS_OK;
+    }
+    case StyleAppearance::Menucheckbox:
+    case StyleAppearance::Menuradio: {
+      EventStates eventState = GetContentState(aFrame, aAppearance);
+
+      aPart = MENU_POPUPCHECK;
+      aState = MC_CHECKMARKNORMAL;
+
+      // Radio states are offset by 2
+      if (aAppearance == StyleAppearance::Menuradio) aState += 2;
+
+      // the disabled states are offset by 1
+      if (IsDisabled(aFrame, eventState)) aState += 1;
+
+      return NS_OK;
+    }
+    case StyleAppearance::Menuitemtext:
+    case StyleAppearance::Menuimage:
+      aPart = -1;
+      aState = 0;
+      return NS_OK;
+
+    case StyleAppearance::MozWindowTitlebar:
+      aPart = mozilla::widget::themeconst::WP_CAPTION;
+      aState = GetTopLevelWindowActiveState(aFrame);
+      return NS_OK;
+    case StyleAppearance::MozWindowTitlebarMaximized:
+      aPart = mozilla::widget::themeconst::WP_MAXCAPTION;
+      aState = GetTopLevelWindowActiveState(aFrame);
+      return NS_OK;
+    case StyleAppearance::MozWindowFrameLeft:
+      aPart = mozilla::widget::themeconst::WP_FRAMELEFT;
+      aState = GetTopLevelWindowActiveState(aFrame);
+      return NS_OK;
+    case StyleAppearance::MozWindowFrameRight:
+      aPart = mozilla::widget::themeconst::WP_FRAMERIGHT;
+      aState = GetTopLevelWindowActiveState(aFrame);
+      return NS_OK;
+    case StyleAppearance::MozWindowFrameBottom:
+      aPart = mozilla::widget::themeconst::WP_FRAMEBOTTOM;
+      aState = GetTopLevelWindowActiveState(aFrame);
+      return NS_OK;
+    case StyleAppearance::MozWindowButtonClose:
+      aPart = mozilla::widget::themeconst::WP_CLOSEBUTTON;
+      aState = GetWindowFrameButtonState(aFrame,
+                                         GetContentState(aFrame, aAppearance));
+      return NS_OK;
+    case StyleAppearance::MozWindowButtonMinimize:
+      aPart = mozilla::widget::themeconst::WP_MINBUTTON;
+      aState = GetWindowFrameButtonState(aFrame,
+                                         GetContentState(aFrame, aAppearance));
+      return NS_OK;
+    case StyleAppearance::MozWindowButtonMaximize:
+      aPart = mozilla::widget::themeconst::WP_MAXBUTTON;
+      aState = GetWindowFrameButtonState(aFrame,
+                                         GetContentState(aFrame, aAppearance));
+      return NS_OK;
+    case StyleAppearance::MozWindowButtonRestore:
+      aPart = mozilla::widget::themeconst::WP_RESTOREBUTTON;
+      aState = GetWindowFrameButtonState(aFrame,
+                                         GetContentState(aFrame, aAppearance));
+      return NS_OK;
+    case StyleAppearance::MozWindowButtonBox:
+    case StyleAppearance::MozWindowButtonBoxMaximized:
+    case StyleAppearance::MozWinGlass:
+    case StyleAppearance::MozWinBorderlessGlass:
+      aPart = -1;
+      aState = 0;
+      return NS_OK;
+    default:
+      aPart = 0;
+      aState = 0;
+      return NS_ERROR_FAILURE;
+  }
+}
+
+static bool AssumeThemePartAndStateAreTransparent(int32_t aPart,
+                                                  int32_t aState) {
+  if (!(IsWin8Point1OrLater() && nsUXThemeData::IsHighContrastOn()) &&
+      aPart == MENU_POPUPITEM && aState == MBI_NORMAL) {
+    return true;
+  }
+  return false;
+}
+
+// When running with per-monitor DPI (on Win8.1+), and rendering on a display
+// with a different DPI setting from the system's default scaling, we need to
+// apply scaling to native-themed elements as the Windows theme APIs assume
+// the system default resolution.
+static inline double GetThemeDpiScaleFactor(nsIFrame* aFrame) {
+  if (WinUtils::IsPerMonitorDPIAware() ||
+      StaticPrefs::layout_css_devPixelsPerPx() > 0.0) {
+    nsIWidget* rootWidget = aFrame->PresContext()->GetRootWidget();
+    if (rootWidget) {
+      double systemScale = WinUtils::SystemScaleFactor();
+      return rootWidget->GetDefaultScale().scale / systemScale;
+    }
+  }
+  return 1.0;
+}
+
+NS_IMETHODIMP
+nsNativeThemeWin::DrawWidgetBackground(gfxContext* aContext, nsIFrame* aFrame,
+                                       StyleAppearance aAppearance,
+                                       const nsRect& aRect,
+                                       const nsRect& aDirtyRect) {
+  if (IsWidgetScrollbarPart(aAppearance)) {
+    if (MayDrawCustomScrollbarPart(aContext, aFrame, aAppearance, aRect,
+                                   aDirtyRect)) {
+      return NS_OK;
+    }
+  }
+
+  HANDLE theme = GetTheme(aAppearance);
+  if (!theme)
+    return ClassicDrawWidgetBackground(aContext, aFrame, aAppearance, aRect,
+                                       aDirtyRect);
+
+  // ^^ without the right sdk, assume xp theming and fall through.
+  if (gfxWindowsPlatform::GetPlatform()->DwmCompositionEnabled()) {
+    switch (aAppearance) {
+      case StyleAppearance::MozWindowTitlebar:
+      case StyleAppearance::MozWindowTitlebarMaximized:
+      case StyleAppearance::MozWindowFrameLeft:
+      case StyleAppearance::MozWindowFrameRight:
+      case StyleAppearance::MozWindowFrameBottom:
+        // Nothing to draw, these areas are glass. Minimum dimensions
+        // should be set, so xul content should be layed out correctly.
+        return NS_OK;
+      case StyleAppearance::MozWindowButtonClose:
+      case StyleAppearance::MozWindowButtonMinimize:
+      case StyleAppearance::MozWindowButtonMaximize:
+      case StyleAppearance::MozWindowButtonRestore:
+        // Not conventional bitmaps, can't be retrieved. If we fall
+        // through here and call the theme library we'll get aero
+        // basic bitmaps.
+        return NS_OK;
+      case StyleAppearance::MozWinGlass:
+      case StyleAppearance::MozWinBorderlessGlass:
+        // Nothing to draw, this is the glass background.
+        return NS_OK;
+      case StyleAppearance::MozWindowButtonBox:
+      case StyleAppearance::MozWindowButtonBoxMaximized:
+        // We handle these through nsIWidget::UpdateThemeGeometries
+        return NS_OK;
+      default:
+        break;
+    }
+  }
+
+  int32_t part, state;
+  nsresult rv = GetThemePartAndState(aFrame, aAppearance, part, state);
+  if (NS_FAILED(rv)) return rv;
+
+  if (AssumeThemePartAndStateAreTransparent(part, state)) {
+    return NS_OK;
+  }
+
+  RefPtr<gfxContext> ctx = aContext;
+  gfxContextMatrixAutoSaveRestore save(ctx);
+
+  double themeScale = GetThemeDpiScaleFactor(aFrame);
+  if (themeScale != 1.0) {
+    ctx->SetMatrix(ctx->CurrentMatrix().PreScale(themeScale, themeScale));
+  }
+
+  gfxFloat p2a = gfxFloat(aFrame->PresContext()->AppUnitsPerDevPixel());
+  RECT widgetRect;
+  RECT clipRect;
+  gfxRect tr(aRect.X(), aRect.Y(), aRect.Width(), aRect.Height()),
+      dr(aDirtyRect.X(), aDirtyRect.Y(), aDirtyRect.Width(),
+         aDirtyRect.Height());
+
+  tr.Scale(1.0 / (p2a * themeScale));
+  dr.Scale(1.0 / (p2a * themeScale));
+
+  gfxWindowsNativeDrawing nativeDrawing(
+      ctx, dr, GetWidgetNativeDrawingFlags(aAppearance));
+
+RENDER_AGAIN:
+
+  HDC hdc = nativeDrawing.BeginNativeDrawing();
+  if (!hdc) return NS_ERROR_FAILURE;
+
+  nativeDrawing.TransformToNativeRect(tr, widgetRect);
+  nativeDrawing.TransformToNativeRect(dr, clipRect);
+
+#if 0
+  {
+    MOZ_LOG(gWindowsLog, LogLevel::Error,
+           (stderr, "xform: %f %f %f %f [%f %f]\n", m._11, m._21, m._12, m._22,
+            m._31, m._32));
+    MOZ_LOG(gWindowsLog, LogLevel::Error,
+           (stderr, "tr: [%d %d %d %d]\ndr: [%d %d %d %d]\noff: [%f %f]\n",
+            tr.x, tr.y, tr.width, tr.height, dr.x, dr.y, dr.width, dr.height,
+            offset.x, offset.y));
+  }
+#endif
+
+  if (aAppearance == StyleAppearance::MozWindowTitlebar) {
+    // Clip out the left and right corners of the frame, all we want in
+    // is the middle section.
+    widgetRect.left -= GetSystemMetrics(SM_CXFRAME);
+    widgetRect.right += GetSystemMetrics(SM_CXFRAME);
+  } else if (aAppearance == StyleAppearance::MozWindowTitlebarMaximized) {
+    // The origin of the window is off screen when maximized and windows
+    // doesn't compensate for this in rendering the background. Push the
+    // top of the bitmap down by SM_CYFRAME so we get the full graphic.
+    widgetRect.top += GetSystemMetrics(SM_CYFRAME);
+  } else if (aAppearance == StyleAppearance::Tab) {
+    // For left edge and right edge tabs, we need to adjust the widget
+    // rects and clip rects so that the edges don't get drawn.
+    bool isLeft = IsLeftToSelectedTab(aFrame);
+    bool isRight = !isLeft && IsRightToSelectedTab(aFrame);
+
+    if (isLeft || isRight) {
+      // HACK ALERT: There appears to be no way to really obtain this value, so
+      // we're forced to just use the default value for Luna (which also happens
+      // to be correct for all the other skins I've tried).
+      int32_t edgeSize = 2;
+
+      // Armed with the size of the edge, we now need to either shift to the
+      // left or to the right.  The clip rect won't include this extra area, so
+      // we know that we're effectively shifting the edge out of view (such that
+      // it won't be painted).
+      if (isLeft)
+        // The right edge should not be drawn.  Extend our rect by the edge
+        // size.
+        widgetRect.right += edgeSize;
+      else
+        // The left edge should not be drawn.  Move the widget rect's left coord
+        // back.
+        widgetRect.left -= edgeSize;
+    }
+  } else if (aAppearance == StyleAppearance::MozWindowButtonMinimize) {
+    OffsetBackgroundRect(widgetRect, CAPTIONBUTTON_MINIMIZE);
+  } else if (aAppearance == StyleAppearance::MozWindowButtonMaximize ||
+             aAppearance == StyleAppearance::MozWindowButtonRestore) {
+    OffsetBackgroundRect(widgetRect, CAPTIONBUTTON_RESTORE);
+  } else if (aAppearance == StyleAppearance::MozWindowButtonClose) {
+    OffsetBackgroundRect(widgetRect, CAPTIONBUTTON_CLOSE);
+  }
+
+  // widgetRect is the bounding box for a widget, yet the scale track is only
+  // a small portion of this size, so the edges of the scale need to be
+  // adjusted to the real size of the track.
+  if (aAppearance == StyleAppearance::Range) {
+    RECT contentRect;
+    GetThemeBackgroundContentRect(theme, hdc, part, state, &widgetRect,
+                                  &contentRect);
+
+    SIZE siz;
+    GetThemePartSize(theme, hdc, part, state, &widgetRect, TS_TRUE, &siz);
+
+    // When rounding is necessary, we round the position of the track
+    // away from the chevron of the thumb to make it look better.
+    if (IsRangeHorizontal(aFrame)) {
+      contentRect.top += (contentRect.bottom - contentRect.top - siz.cy) / 2;
+      contentRect.bottom = contentRect.top + siz.cy;
+    } else {
+      if (!IsFrameRTL(aFrame)) {
+        contentRect.left += (contentRect.right - contentRect.left - siz.cx) / 2;
+        contentRect.right = contentRect.left + siz.cx;
+      } else {
+        contentRect.right -=
+            (contentRect.right - contentRect.left - siz.cx) / 2;
+        contentRect.left = contentRect.right - siz.cx;
+      }
+    }
+
+    DrawThemeBackground(theme, hdc, part, state, &contentRect, &clipRect);
+  } else if (aAppearance == StyleAppearance::Menucheckbox ||
+             aAppearance == StyleAppearance::Menuradio) {
+    bool isChecked = false;
+    isChecked = CheckBooleanAttr(aFrame, nsGkAtoms::checked);
+
+    if (isChecked) {
+      int bgState = MCB_NORMAL;
+      EventStates eventState = GetContentState(aFrame, aAppearance);
+
+      // the disabled states are offset by 1
+      if (IsDisabled(aFrame, eventState)) bgState += 1;
+
+      SIZE checkboxBGSize(GetCheckboxBGSize(theme, hdc));
+
+      RECT checkBGRect = widgetRect;
+      if (IsFrameRTL(aFrame)) {
+        checkBGRect.left = checkBGRect.right - checkboxBGSize.cx;
+      } else {
+        checkBGRect.right = checkBGRect.left + checkboxBGSize.cx;
+      }
+
+      // Center the checkbox background vertically in the menuitem
+      checkBGRect.top +=
+          (checkBGRect.bottom - checkBGRect.top) / 2 - checkboxBGSize.cy / 2;
+      checkBGRect.bottom = checkBGRect.top + checkboxBGSize.cy;
+
+      DrawThemeBackground(theme, hdc, MENU_POPUPCHECKBACKGROUND, bgState,
+                          &checkBGRect, &clipRect);
+
+      MARGINS checkMargins = GetCheckboxMargins(theme, hdc);
+      RECT checkRect = checkBGRect;
+      checkRect.left += checkMargins.cxLeftWidth;
+      checkRect.right -= checkMargins.cxRightWidth;
+      checkRect.top += checkMargins.cyTopHeight;
+      checkRect.bottom -= checkMargins.cyBottomHeight;
+      DrawThemeBackground(theme, hdc, MENU_POPUPCHECK, state, &checkRect,
+                          &clipRect);
+    }
+  } else if (aAppearance == StyleAppearance::Menupopup) {
+    DrawThemeBackground(theme, hdc, MENU_POPUPBORDERS, /* state */ 0,
+                        &widgetRect, &clipRect);
+    SIZE borderSize;
+    GetThemePartSize(theme, hdc, MENU_POPUPBORDERS, 0, nullptr, TS_TRUE,
+                     &borderSize);
+
+    RECT bgRect = widgetRect;
+    bgRect.top += borderSize.cy;
+    bgRect.bottom -= borderSize.cy;
+    bgRect.left += borderSize.cx;
+    bgRect.right -= borderSize.cx;
+
+    DrawThemeBackground(theme, hdc, MENU_POPUPBACKGROUND, /* state */ 0,
+                        &bgRect, &clipRect);
+
+    SIZE gutterSize(GetGutterSize(theme, hdc));
+
+    RECT gutterRect;
+    gutterRect.top = bgRect.top;
+    gutterRect.bottom = bgRect.bottom;
+    if (IsFrameRTL(aFrame)) {
+      gutterRect.right = bgRect.right;
+      gutterRect.left = gutterRect.right - gutterSize.cx;
+    } else {
+      gutterRect.left = bgRect.left;
+      gutterRect.right = gutterRect.left + gutterSize.cx;
+    }
+
+    DrawThemeBGRTLAware(theme, hdc, MENU_POPUPGUTTER, /* state */ 0,
+                        &gutterRect, &clipRect, IsFrameRTL(aFrame));
+  } else if (aAppearance == StyleAppearance::Menuseparator) {
+    SIZE gutterSize(GetGutterSize(theme, hdc));
+
+    RECT sepRect = widgetRect;
+    if (IsFrameRTL(aFrame))
+      sepRect.right -= gutterSize.cx;
+    else
+      sepRect.left += gutterSize.cx;
+
+    DrawThemeBackground(theme, hdc, MENU_POPUPSEPARATOR, /* state */ 0,
+                        &sepRect, &clipRect);
+  } else if (aAppearance == StyleAppearance::Menuarrow) {
+    // We're dpi aware and as such on systems that have dpi > 96 set, the
+    // theme library expects us to do proper positioning and scaling of glyphs.
+    // For StyleAppearance::Menuarrow, layout may hand us a widget rect larger
+    // than the glyph rect we request in GetMinimumWidgetSize. To prevent
+    // distortion we have to position and scale what we draw.
+
+    SIZE glyphSize;
+    GetThemePartSize(theme, hdc, part, state, nullptr, TS_TRUE, &glyphSize);
+
+    int32_t widgetHeight = widgetRect.bottom - widgetRect.top;
+
+    RECT renderRect = widgetRect;
+
+    // We request (glyph width * 2, glyph height) in GetMinimumWidgetSize. In
+    // Firefox some menu items provide the full height of the item to us, in
+    // others our widget rect is the exact dims of our arrow glyph. Adjust the
+    // vertical position by the added space, if any exists.
+    renderRect.top += ((widgetHeight - glyphSize.cy) / 2);
+    renderRect.bottom = renderRect.top + glyphSize.cy;
+    // I'm using the width of the arrow glyph for the arrow-side padding.
+    // AFAICT there doesn't appear to be a theme constant we can query
+    // for this value. Generally this looks correct, and has the added
+    // benefit of being a dpi adjusted value.
+    if (!IsFrameRTL(aFrame)) {
+      renderRect.right = widgetRect.right - glyphSize.cx;
+      renderRect.left = renderRect.right - glyphSize.cx;
+    } else {
+      renderRect.left = glyphSize.cx;
+      renderRect.right = renderRect.left + glyphSize.cx;
+    }
+    DrawThemeBGRTLAware(theme, hdc, part, state, &renderRect, &clipRect,
+                        IsFrameRTL(aFrame));
+  }
+  // The following widgets need to be RTL-aware
+  else if (aAppearance == StyleAppearance::Resizer ||
+           aAppearance == StyleAppearance::MozMenulistArrowButton) {
+    DrawThemeBGRTLAware(theme, hdc, part, state, &widgetRect, &clipRect,
+                        IsFrameRTL(aFrame));
+  } else if (aAppearance == StyleAppearance::NumberInput ||
+             aAppearance == StyleAppearance::Textfield ||
+             aAppearance == StyleAppearance::Textarea) {
+    DrawThemeBackground(theme, hdc, part, state, &widgetRect, &clipRect);
+
+    if (state == TFS_EDITBORDER_DISABLED) {
+      InflateRect(&widgetRect, -1, -1);
+      ::FillRect(hdc, &widgetRect, reinterpret_cast<HBRUSH>(COLOR_BTNFACE + 1));
+    }
+  } else if (aAppearance == StyleAppearance::ProgressBar) {
+    // DrawThemeBackground renders each corner with a solid white pixel.
+    // Restore these pixels to the underlying color. Tracks are rendered
+    // using alpha recovery, so this makes the corners transparent.
+    COLORREF color;
+    color = GetPixel(hdc, widgetRect.left, widgetRect.top);
+    DrawThemeBackground(theme, hdc, part, state, &widgetRect, &clipRect);
+    SetPixel(hdc, widgetRect.left, widgetRect.top, color);
+    SetPixel(hdc, widgetRect.right - 1, widgetRect.top, color);
+    SetPixel(hdc, widgetRect.right - 1, widgetRect.bottom - 1, color);
+    SetPixel(hdc, widgetRect.left, widgetRect.bottom - 1, color);
+  } else if (aAppearance == StyleAppearance::Progresschunk) {
+    DrawThemedProgressMeter(aFrame, aAppearance, theme, hdc, part, state,
+                            &widgetRect, &clipRect);
+  } else if (aAppearance == StyleAppearance::FocusOutline) {
+    // Inflate 'widgetRect' with the focus outline size.
+    LayoutDeviceIntMargin border = GetWidgetBorder(
+        aFrame->PresContext()->DeviceContext(), aFrame, aAppearance);
+    widgetRect.left -= border.left;
+    widgetRect.right += border.right;
+    widgetRect.top -= border.top;
+    widgetRect.bottom += border.bottom;
+
+    DTBGOPTS opts = {sizeof(DTBGOPTS), DTBG_OMITCONTENT | DTBG_CLIPRECT,
+                     clipRect};
+    DrawThemeBackgroundEx(theme, hdc, part, state, &widgetRect, &opts);
+  }
+  // If part is negative, the element wishes us to not render a themed
+  // background, instead opting to be drawn specially below.
+  else if (part >= 0) {
+    DrawThemeBackground(theme, hdc, part, state, &widgetRect, &clipRect);
+  }
+
+  // Draw focus rectangles for range elements
+  // XXX it'd be nice to draw these outside of the frame
+  if (aAppearance == StyleAppearance::Range) {
+    EventStates contentState = GetContentState(aFrame, aAppearance);
+
+    if (contentState.HasState(NS_EVENT_STATE_FOCUSRING)) {
+      POINT vpOrg;
+      HPEN hPen = nullptr;
+
+      uint8_t id = SaveDC(hdc);
+
+      ::SelectClipRgn(hdc, nullptr);
+      ::GetViewportOrgEx(hdc, &vpOrg);
+      ::SetBrushOrgEx(hdc, vpOrg.x + widgetRect.left, vpOrg.y + widgetRect.top,
+                      nullptr);
+      ::SetTextColor(hdc, 0);
+      ::DrawFocusRect(hdc, &widgetRect);
+      ::RestoreDC(hdc, id);
+      if (hPen) {
+        ::DeleteObject(hPen);
+      }
+    }
+  } else if (aAppearance == StyleAppearance::Toolbar && state == 0) {
+    // Draw toolbar separator lines above all toolbars except the first one.
+    // The lines are part of the Rebar theme, which is loaded for
+    // StyleAppearance::Toolbox.
+    theme = GetTheme(StyleAppearance::Toolbox);
+    if (!theme) return NS_ERROR_FAILURE;
+
+    widgetRect.bottom = widgetRect.top + TB_SEPARATOR_HEIGHT;
+    DrawThemeEdge(theme, hdc, RP_BAND, 0, &widgetRect, EDGE_ETCHED, BF_TOP,
+                  nullptr);
+  } else if (aAppearance == StyleAppearance::ScrollbarthumbHorizontal ||
+             aAppearance == StyleAppearance::ScrollbarthumbVertical) {
+    // Draw the decorative gripper for the scrollbar thumb button, if it fits
+
+    SIZE gripSize;
+    MARGINS thumbMgns;
+    int gripPart = (aAppearance == StyleAppearance::ScrollbarthumbHorizontal)
+                       ? SP_GRIPPERHOR
+                       : SP_GRIPPERVERT;
+
+    if (GetThemePartSize(theme, hdc, gripPart, state, nullptr, TS_TRUE,
+                         &gripSize) == S_OK &&
+        GetThemeMargins(theme, hdc, part, state, TMT_CONTENTMARGINS, nullptr,
+                        &thumbMgns) == S_OK &&
+        gripSize.cx + thumbMgns.cxLeftWidth + thumbMgns.cxRightWidth <=
+            widgetRect.right - widgetRect.left &&
+        gripSize.cy + thumbMgns.cyTopHeight + thumbMgns.cyBottomHeight <=
+            widgetRect.bottom - widgetRect.top) {
+      DrawThemeBackground(theme, hdc, gripPart, state, &widgetRect, &clipRect);
+    }
+  }
+
+  nativeDrawing.EndNativeDrawing();
+
+  if (nativeDrawing.ShouldRenderAgain()) goto RENDER_AGAIN;
+
+  nativeDrawing.PaintToContext();
+
+  return NS_OK;
+}
+
+static void ScaleForFrameDPI(LayoutDeviceIntMargin* aMargin, nsIFrame* aFrame) {
+  double themeScale = GetThemeDpiScaleFactor(aFrame);
+  if (themeScale != 1.0) {
+    aMargin->top = NSToIntRound(aMargin->top * themeScale);
+    aMargin->left = NSToIntRound(aMargin->left * themeScale);
+    aMargin->bottom = NSToIntRound(aMargin->bottom * themeScale);
+    aMargin->right = NSToIntRound(aMargin->right * themeScale);
+  }
+}
+
+static void ScaleForFrameDPI(LayoutDeviceIntSize* aSize, nsIFrame* aFrame) {
+  double themeScale = GetThemeDpiScaleFactor(aFrame);
+  if (themeScale != 1.0) {
+    aSize->width = NSToIntRound(aSize->width * themeScale);
+    aSize->height = NSToIntRound(aSize->height * themeScale);
+  }
+}
+
+LayoutDeviceIntMargin nsNativeThemeWin::GetWidgetBorder(
+    nsDeviceContext* aContext, nsIFrame* aFrame, StyleAppearance aAppearance) {
+  LayoutDeviceIntMargin result;
+  mozilla::Maybe<nsUXThemeClass> themeClass = GetThemeClass(aAppearance);
+  HTHEME theme = NULL;
+  if (!themeClass.isNothing()) {
+    theme = nsUXThemeData::GetTheme(themeClass.value());
+  }
+  if (!theme) {
+    result = ClassicGetWidgetBorder(aContext, aFrame, aAppearance);
+    ScaleForFrameDPI(&result, aFrame);
+    return result;
+  }
+
+  if (!WidgetIsContainer(aAppearance) ||
+      aAppearance == StyleAppearance::Toolbox ||
+      aAppearance == StyleAppearance::MozWinMediaToolbox ||
+      aAppearance == StyleAppearance::MozWinCommunicationsToolbox ||
+      aAppearance == StyleAppearance::MozWinBrowsertabbarToolbox ||
+      aAppearance == StyleAppearance::Statusbar ||
+      aAppearance == StyleAppearance::Resizer ||
+      aAppearance == StyleAppearance::Tabpanel ||
+      aAppearance == StyleAppearance::ScrollbarHorizontal ||
+      aAppearance == StyleAppearance::ScrollbarVertical ||
+      aAppearance == StyleAppearance::Scrollcorner ||
+      aAppearance == StyleAppearance::Menuitem ||
+      aAppearance == StyleAppearance::Checkmenuitem ||
+      aAppearance == StyleAppearance::Radiomenuitem ||
+      aAppearance == StyleAppearance::Menupopup ||
+      aAppearance == StyleAppearance::Menuimage ||
+      aAppearance == StyleAppearance::Menuitemtext ||
+      aAppearance == StyleAppearance::Separator ||
+      aAppearance == StyleAppearance::MozWindowTitlebar ||
+      aAppearance == StyleAppearance::MozWindowTitlebarMaximized ||
+      aAppearance == StyleAppearance::MozWinGlass ||
+      aAppearance == StyleAppearance::MozWinBorderlessGlass)
+    return result;  // Don't worry about it.
+
+  int32_t part, state;
+  nsresult rv = GetThemePartAndState(aFrame, aAppearance, part, state);
+  if (NS_FAILED(rv)) return result;
+
+  if (aAppearance == StyleAppearance::Toolbar) {
+    // make space for the separator line above all toolbars but the first
+    if (state == 0) result.top = TB_SEPARATOR_HEIGHT;
+    return result;
+  }
+
+  result = GetCachedWidgetBorder(theme, themeClass.value(), aAppearance, part,
+                                 state);
+
+  // Remove the edges for tabs that are before or after the selected tab,
+  if (aAppearance == StyleAppearance::Tab) {
+    if (IsLeftToSelectedTab(aFrame))
+      // Remove the right edge, since we won't be drawing it.
+      result.right = 0;
+    else if (IsRightToSelectedTab(aFrame))
+      // Remove the left edge, since we won't be drawing it.
+      result.left = 0;
+  }
+
+  if (aFrame && (aAppearance == StyleAppearance::NumberInput ||
+                 aAppearance == StyleAppearance::Textfield ||
+                 aAppearance == StyleAppearance::Textarea)) {
+    nsIContent* content = aFrame->GetContent();
+    if (content && content->IsHTMLElement()) {
+      // We need to pad textfields by 1 pixel, since the caret will draw
+      // flush against the edge by default if we don't.
+      result.top++;
+      result.left++;
+      result.bottom++;
+      result.right++;
+    }
+  }
+
+  ScaleForFrameDPI(&result, aFrame);
+  return result;
+}
+
+bool nsNativeThemeWin::GetWidgetPadding(nsDeviceContext* aContext,
+                                        nsIFrame* aFrame,
+                                        StyleAppearance aAppearance,
+                                        LayoutDeviceIntMargin* aResult) {
+  switch (aAppearance) {
+    // 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;
+  }
+
+  bool ok = true;
+
+  if (aAppearance == StyleAppearance::MozWindowButtonBox ||
+      aAppearance == StyleAppearance::MozWindowButtonBoxMaximized) {
+    aResult->SizeTo(0, 0, 0, 0);
+
+    // aero glass doesn't display custom buttons
+    if (gfxWindowsPlatform::GetPlatform()->DwmCompositionEnabled()) return true;
+
+    // button padding for standard windows
+    if (aAppearance == StyleAppearance::MozWindowButtonBox) {
+      aResult->top = GetSystemMetrics(SM_CXFRAME);
+    }
+    ScaleForFrameDPI(aResult, aFrame);
+    return ok;
+  }
+
+  // Content padding
+  if (aAppearance == StyleAppearance::MozWindowTitlebar ||
+      aAppearance == StyleAppearance::MozWindowTitlebarMaximized) {
+    aResult->SizeTo(0, 0, 0, 0);
+    // XXX Maximized windows have an offscreen offset equal to
+    // the border padding. This should be addressed in nsWindow,
+    // but currently can't be, see UpdateNonClientMargins.
+    if (aAppearance == StyleAppearance::MozWindowTitlebarMaximized) {
+      nsIWidget* rootWidget = nullptr;
+      if (WinUtils::HasSystemMetricsForDpi()) {
+        rootWidget = aFrame->PresContext()->GetRootWidget();
+      }
+      if (rootWidget) {
+        double dpi = rootWidget->GetDPI();
+        aResult->top = WinUtils::GetSystemMetricsForDpi(SM_CXFRAME, dpi) +
+                       WinUtils::GetSystemMetricsForDpi(SM_CXPADDEDBORDER, dpi);
+      } else {
+        aResult->top =
+            GetSystemMetrics(SM_CXFRAME) + GetSystemMetrics(SM_CXPADDEDBORDER);
+      }
+    }
+    return ok;
+  }
+
+  HANDLE theme = GetTheme(aAppearance);
+  if (!theme) {
+    ok = ClassicGetWidgetPadding(aContext, aFrame, aAppearance, aResult);
+    ScaleForFrameDPI(aResult, aFrame);
+    return ok;
+  }
+
+  if (aAppearance == StyleAppearance::Menupopup) {
+    SIZE popupSize;
+    GetThemePartSize(theme, nullptr, MENU_POPUPBORDERS, /* state */ 0, nullptr,
+                     TS_TRUE, &popupSize);
+    aResult->top = aResult->bottom = popupSize.cy;
+    aResult->left = aResult->right = popupSize.cx;
+    ScaleForFrameDPI(aResult, aFrame);
+    return ok;
+  }
+
+  if (aAppearance == StyleAppearance::NumberInput ||
+      aAppearance == StyleAppearance::Textfield ||
+      aAppearance == StyleAppearance::Textarea ||
+      aAppearance == StyleAppearance::MenulistButton ||
+      aAppearance == StyleAppearance::Menulist) {
+    // If we have author-specified padding for these elements, don't do the
+    // fixups below.
+    if (aFrame->PresContext()->HasAuthorSpecifiedRules(
+            aFrame, NS_AUTHOR_SPECIFIED_PADDING))
+      return false;
+  }
+
+  /* textfields need extra pixels on all sides, otherwise they wrap their
+   * content too tightly.  The actual border is drawn 1px inside the specified
+   * rectangle, so Gecko will end up making the contents look too small.
+   * Instead, we add 2px padding for the contents and fix this. (Used to be 1px
+   * added, see bug 430212)
+   */
+  if (aAppearance == StyleAppearance::NumberInput ||
+      aAppearance == StyleAppearance::Textfield ||
+      aAppearance == StyleAppearance::Textarea) {
+    aResult->top = aResult->bottom = 2;
+    aResult->left = aResult->right = 2;
+    ScaleForFrameDPI(aResult, aFrame);
+    return ok;
+  } else if (IsHTMLContent(aFrame) &&
+             (aAppearance == StyleAppearance::Menulist ||
+              aAppearance == StyleAppearance::MenulistButton)) {
+    /* For content menulist controls, we need an extra pixel so that we have
+     * room to draw our focus rectangle stuff. Otherwise, the focus rect might
+     * overlap the control's border.
+     */
+    aResult->top = aResult->bottom = 1;
+    aResult->left = aResult->right = 1;
+    ScaleForFrameDPI(aResult, aFrame);
+    return ok;
+  }
+
+  int32_t right, left, top, bottom;
+  right = left = top = bottom = 0;
+  switch (aAppearance) {
+    case StyleAppearance::Menuimage:
+      right = 8;
+      left = 3;
+      break;
+    case StyleAppearance::Menucheckbox:
+    case StyleAppearance::Menuradio:
+      right = 8;
+      left = 0;
+      break;
+    case StyleAppearance::Menuitemtext:
+      // There seem to be exactly 4 pixels from the edge
+      // of the gutter to the text: 2px margin (CSS) + 2px padding (here)
+      {
+        SIZE size(GetGutterSize(theme, nullptr));
+        left = size.cx + 2;
+      }
+      break;
+    case StyleAppearance::Menuseparator: {
+      SIZE size(GetGutterSize(theme, nullptr));
+      left = size.cx + 5;
+      top = 10;
+      bottom = 7;
+    } break;
+    default:
+      return false;
+  }
+
+  if (IsFrameRTL(aFrame)) {
+    aResult->right = left;
+    aResult->left = right;
+  } else {
+    aResult->right = right;
+    aResult->left = left;
+  }
+
+  ScaleForFrameDPI(aResult, aFrame);
+  return ok;
+}
+
+bool nsNativeThemeWin::GetWidgetOverflow(nsDeviceContext* aContext,
+                                         nsIFrame* aFrame,
+                                         StyleAppearance aAppearance,
+                                         nsRect* aOverflowRect) {
+  /* This is disabled for now, because it causes invalidation problems --
+   * see bug 420381.  The effect of not updating the overflow area is that
+   * for dropdown buttons in content areas, there is a 1px border on 3 sides
+   * where, if invalidated, the dropdown control probably won't be repainted.
+   * This is fairly minor, as by default there is nothing in that area, and
+   * a border only shows up if the widget is being hovered.
+   *
+   * TODO(jwatt): Figure out what do to about
+   * StyleAppearance::MozMenulistArrowButton too.
+   */
+#if 0
+  /* We explicitly draw dropdown buttons in HTML content 1px bigger up, right,
+   * and bottom so that they overlap the dropdown's border like they're
+   * supposed to.
+   */
+  if (aAppearance == StyleAppearance::MenulistButton &&
+      IsHTMLContent(aFrame) &&
+      !IsWidgetStyled(aFrame->GetParent()->PresContext(),
+                      aFrame->GetParent(),
+                      StyleAppearance::Menulist))
+  {
+    int32_t p2a = aContext->AppUnitsPerDevPixel();
+    /* Note: no overflow on the left */
+    nsMargin m(p2a, p2a, p2a, 0);
+    aOverflowRect->Inflate (m);
+    return true;
+  }
+#endif
+
+  if (aAppearance == StyleAppearance::FocusOutline) {
+    LayoutDeviceIntMargin border =
+        GetWidgetBorder(aContext, aFrame, aAppearance);
+    int32_t p2a = aContext->AppUnitsPerDevPixel();
+    nsMargin m(NSIntPixelsToAppUnits(border.top, p2a),
+               NSIntPixelsToAppUnits(border.right, p2a),
+               NSIntPixelsToAppUnits(border.bottom, p2a),
+               NSIntPixelsToAppUnits(border.left, p2a));
+    aOverflowRect->Inflate(m);
+    return true;
+  }
+
+  return false;
+}
+
+NS_IMETHODIMP
+nsNativeThemeWin::GetMinimumWidgetSize(nsPresContext* aPresContext,
+                                       nsIFrame* aFrame,
+                                       StyleAppearance aAppearance,
+                                       LayoutDeviceIntSize* aResult,
+                                       bool* aIsOverridable) {
+  aResult->width = aResult->height = 0;
+  *aIsOverridable = true;
+  nsresult rv = NS_OK;
+
+  mozilla::Maybe<nsUXThemeClass> themeClass = GetThemeClass(aAppearance);
+  HTHEME theme = NULL;
+  if (!themeClass.isNothing()) {
+    theme = nsUXThemeData::GetTheme(themeClass.value());
+  }
+  if (!theme) {
+    rv = ClassicGetMinimumWidgetSize(aFrame, aAppearance, aResult,
+                                     aIsOverridable);
+    ScaleForFrameDPI(aResult, aFrame);
+    return rv;
+  }
+
+  switch (aAppearance) {
+    case StyleAppearance::Groupbox:
+    case StyleAppearance::NumberInput:
+    case StyleAppearance::Textfield:
+    case StyleAppearance::Toolbox:
+    case StyleAppearance::MozWinMediaToolbox:
+    case StyleAppearance::MozWinCommunicationsToolbox:
+    case StyleAppearance::MozWinBrowsertabbarToolbox:
+    case StyleAppearance::Toolbar:
+    case StyleAppearance::Statusbar:
+    case StyleAppearance::Progresschunk:
+    case StyleAppearance::Tabpanels:
+    case StyleAppearance::Tabpanel:
+    case StyleAppearance::Listbox:
+    case StyleAppearance::Treeview:
+    case StyleAppearance::Menuitemtext:
+    case StyleAppearance::MozWinGlass:
+    case StyleAppearance::MozWinBorderlessGlass:
+      return NS_OK;  // Don't worry about it.
+    default:
+      break;
+  }
+
+  if (aAppearance == StyleAppearance::Menuitem && IsTopLevelMenu(aFrame)) {
+    return NS_OK;  // Don't worry about it for top level menus
+  }
+
+  // Call GetSystemMetrics to determine size for WinXP scrollbars
+  // (GetThemeSysSize API returns the optimal size for the theme, but
+  //  Windows appears to always use metrics when drawing standard scrollbars)
+  THEMESIZE sizeReq = TS_TRUE;  // Best-fit size
+  switch (aAppearance) {
+    case StyleAppearance::ScrollbarthumbVertical:
+    case StyleAppearance::ScrollbarthumbHorizontal:
+    case StyleAppearance::ScrollbarbuttonUp:
+    case StyleAppearance::ScrollbarbuttonDown:
+    case StyleAppearance::ScrollbarbuttonLeft:
+    case StyleAppearance::ScrollbarbuttonRight:
+    case StyleAppearance::ScrollbarHorizontal:
+    case StyleAppearance::ScrollbarVertical:
+    case StyleAppearance::MozMenulistArrowButton: {
+      rv = ClassicGetMinimumWidgetSize(aFrame, aAppearance, aResult,
+                                       aIsOverridable);
+      ScaleForFrameDPI(aResult, aFrame);
+      return rv;
+    }
+    case StyleAppearance::Menuitem:
+    case StyleAppearance::Checkmenuitem:
+    case StyleAppearance::Radiomenuitem:
+      if (!IsTopLevelMenu(aFrame)) {
+        SIZE gutterSize(GetCachedGutterSize(theme));
+        aResult->width = gutterSize.cx;
+        aResult->height = gutterSize.cy;
+        ScaleForFrameDPI(aResult, aFrame);
+        return rv;
+      }
+      break;
+
+    case StyleAppearance::Menuimage:
+    case StyleAppearance::Menucheckbox:
+    case StyleAppearance::Menuradio: {
+      SIZE boxSize(GetCachedGutterSize(theme));
+      aResult->width = boxSize.cx + 2;
+      aResult->height = boxSize.cy;
+      *aIsOverridable = false;
+      ScaleForFrameDPI(aResult, aFrame);
+      return rv;
+    }
+
+    case StyleAppearance::Menuitemtext:
+      return NS_OK;
+
+    case StyleAppearance::ProgressBar:
+      // Best-fit size for progress meters is too large for most
+      // themes. We want these widgets to be able to really shrink
+      // down, so use the min-size request value (of 0).
+      sizeReq = TS_MIN;
+      break;
+
+    case StyleAppearance::Resizer:
+      *aIsOverridable = false;
+      break;
+
+    case StyleAppearance::RangeThumb: {
+      *aIsOverridable = false;
+      if (IsRangeHorizontal(aFrame)) {
+        aResult->width = 12;
+        aResult->height = 20;
+      } else {
+        aResult->width = 20;
+        aResult->height = 12;
+      }
+      ScaleForFrameDPI(aResult, aFrame);
+      return rv;
+    }
+
+    case StyleAppearance::Scrollcorner: {
+      if (nsLookAndFeel::GetInt(nsLookAndFeel::IntID::UseOverlayScrollbars) !=
+          0) {
+        aResult->SizeTo(::GetSystemMetrics(SM_CXHSCROLL),
+                        ::GetSystemMetrics(SM_CYVSCROLL));
+        ScaleForFrameDPI(aResult, aFrame);
+        return rv;
+      }
+      break;
+    }
+
+    case StyleAppearance::Separator:
+      // that's 2px left margin, 2px right margin and 2px separator
+      // (the margin is drawn as part of the separator, though)
+      aResult->width = 6;
+      ScaleForFrameDPI(aResult, aFrame);
+      return rv;
+
+    case StyleAppearance::Button:
+      // We should let HTML buttons shrink to their min size.
+      // FIXME bug 403934: We should probably really separate
+      // GetPreferredWidgetSize from GetMinimumWidgetSize, so callers can
+      // use the one they want.
+      if (aFrame->GetContent()->IsHTMLElement()) {
+        sizeReq = TS_MIN;
+      }
+      break;
+
+    case StyleAppearance::MozWindowButtonMaximize:
+    case StyleAppearance::MozWindowButtonRestore:
+      // The only way to get accurate titlebar button info is to query a
+      // window w/buttons when it's visible. nsWindow takes care of this and
+      // stores that info in nsUXThemeData.
+      aResult->width =
+          nsUXThemeData::GetCommandButtonMetrics(CMDBUTTONIDX_RESTORE).cx;
+      aResult->height =
+          nsUXThemeData::GetCommandButtonMetrics(CMDBUTTONIDX_RESTORE).cy;
+      AddPaddingRect(aResult, CAPTIONBUTTON_RESTORE);
+      *aIsOverridable = false;
+      return rv;
+
+    case StyleAppearance::MozWindowButtonMinimize:
+      aResult->width =
+          nsUXThemeData::GetCommandButtonMetrics(CMDBUTTONIDX_MINIMIZE).cx;
+      aResult->height =
+          nsUXThemeData::GetCommandButtonMetrics(CMDBUTTONIDX_MINIMIZE).cy;
+      AddPaddingRect(aResult, CAPTIONBUTTON_MINIMIZE);
+      *aIsOverridable = false;
+      return rv;
+
+    case StyleAppearance::MozWindowButtonClose:
+      aResult->width =
+          nsUXThemeData::GetCommandButtonMetrics(CMDBUTTONIDX_CLOSE).cx;
+      aResult->height =
+          nsUXThemeData::GetCommandButtonMetrics(CMDBUTTONIDX_CLOSE).cy;
+      AddPaddingRect(aResult, CAPTIONBUTTON_CLOSE);
+      *aIsOverridable = false;
+      return rv;
+
+    case StyleAppearance::MozWindowTitlebar:
+    case StyleAppearance::MozWindowTitlebarMaximized:
+      aResult->height = GetSystemMetrics(SM_CYCAPTION);
+      aResult->height += GetSystemMetrics(SM_CYFRAME);
+      aResult->height += GetSystemMetrics(SM_CXPADDEDBORDER);
+      // On Win8.1, we don't want this scaling, because Windows doesn't scale
+      // the non-client area of the window, and we can end up with ugly overlap
+      // of the window frame controls into the tab bar or content area. But on
+      // Win10, we render the window controls ourselves, and the result looks
+      // better if we do apply this scaling (particularly with themes such as
+      // DevEdition; see bug 1267636).
+      if (IsWin10OrLater()) {
+        ScaleForFrameDPI(aResult, aFrame);
+      }
+      *aIsOverridable = false;
+      return rv;
+
+    case StyleAppearance::MozWindowButtonBox:
+    case StyleAppearance::MozWindowButtonBoxMaximized:
+      if (gfxWindowsPlatform::GetPlatform()->DwmCompositionEnabled()) {
+        aResult->width = nsUXThemeData::GetCommandButtonBoxMetrics().cx;
+        aResult->height = nsUXThemeData::GetCommandButtonBoxMetrics().cy -
+                          GetSystemMetrics(SM_CYFRAME) -
+                          GetSystemMetrics(SM_CXPADDEDBORDER);
+        if (aAppearance == StyleAppearance::MozWindowButtonBoxMaximized) {
+          aResult->width += 1;
+          aResult->height -= 2;
+        }
+        *aIsOverridable = false;
+        return rv;
+      }
+      break;
+
+    case StyleAppearance::MozWindowFrameLeft:
+    case StyleAppearance::MozWindowFrameRight:
+    case StyleAppearance::MozWindowFrameBottom:
+      aResult->width = GetSystemMetrics(SM_CXFRAME);
+      aResult->height = GetSystemMetrics(SM_CYFRAME);
+      *aIsOverridable = false;
+      return rv;
+
+    default:
+      break;
+  }
+
+  int32_t part, state;
+  rv = GetThemePartAndState(aFrame, aAppearance, part, state);
+  if (NS_FAILED(rv)) return rv;
+
+  rv = GetCachedMinimumWidgetSize(aFrame, theme, themeClass.value(),
+                                  aAppearance, part, state, sizeReq, aResult);
+
+  ScaleForFrameDPI(aResult, aFrame);
+  return rv;
+}
+
+NS_IMETHODIMP
+nsNativeThemeWin::WidgetStateChanged(nsIFrame* aFrame,
+                                     StyleAppearance aAppearance,
+                                     nsAtom* aAttribute, bool* aShouldRepaint,
+                                     const nsAttrValue* aOldValue) {
+  // Some widget types just never change state.
+  if (aAppearance == StyleAppearance::Toolbox ||
+      aAppearance == StyleAppearance::MozWinMediaToolbox ||
+      aAppearance == StyleAppearance::MozWinCommunicationsToolbox ||
+      aAppearance == StyleAppearance::MozWinBrowsertabbarToolbox ||
+      aAppearance == StyleAppearance::Toolbar ||
+      aAppearance == StyleAppearance::Statusbar ||
+      aAppearance == StyleAppearance::Statusbarpanel ||
+      aAppearance == StyleAppearance::Resizerpanel ||
+      aAppearance == StyleAppearance::Progresschunk ||
+      aAppearance == StyleAppearance::ProgressBar ||
+      aAppearance == StyleAppearance::Tooltip ||
+      aAppearance == StyleAppearance::Tabpanels ||
+      aAppearance == StyleAppearance::Tabpanel ||
+      aAppearance == StyleAppearance::Separator ||
+      aAppearance == StyleAppearance::MozWinGlass ||
+      aAppearance == StyleAppearance::MozWinBorderlessGlass) {
+    *aShouldRepaint = false;
+    return NS_OK;
+  }
+
+  if (aAppearance == StyleAppearance::MozWindowTitlebar ||
+      aAppearance == StyleAppearance::MozWindowTitlebarMaximized ||
+      aAppearance == StyleAppearance::MozWindowFrameLeft ||
+      aAppearance == StyleAppearance::MozWindowFrameRight ||
+      aAppearance == StyleAppearance::MozWindowFrameBottom ||
+      aAppearance == StyleAppearance::MozWindowButtonClose ||
+      aAppearance == StyleAppearance::MozWindowButtonMinimize ||
+      aAppearance == StyleAppearance::MozWindowButtonMaximize ||
+      aAppearance == StyleAppearance::MozWindowButtonRestore) {
+    *aShouldRepaint = true;
+    return NS_OK;
+  }
+
+  // We need to repaint the dropdown arrow in vista HTML combobox controls when
+  // the control is closed to get rid of the hover effect.
+  if ((aAppearance == StyleAppearance::Menulist ||
+       aAppearance == StyleAppearance::MenulistButton ||
+       aAppearance == StyleAppearance::MozMenulistArrowButton) &&
+      nsNativeTheme::IsHTMLContent(aFrame)) {
+    *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;
+  } else {
+    // 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::readonly || aAttribute == nsGkAtoms::open ||
+        aAttribute == nsGkAtoms::menuactive || aAttribute == nsGkAtoms::focused)
+      *aShouldRepaint = true;
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsNativeThemeWin::ThemeChanged() {
+  nsUXThemeData::Invalidate();
+  memset(mBorderCacheValid, 0, sizeof(mBorderCacheValid));
+  memset(mMinimumWidgetSizeCacheValid, 0, sizeof(mMinimumWidgetSizeCacheValid));
+  mGutterSizeCacheValid = false;
+  return NS_OK;
+}
+
+bool nsNativeThemeWin::ThemeSupportsWidget(nsPresContext* aPresContext,
+                                           nsIFrame* aFrame,
+                                           StyleAppearance aAppearance) {
+  // XXXdwh We can go even further and call the API to ask if support exists for
+  // specific widgets.
+
+  if (aAppearance == StyleAppearance::FocusOutline) {
+    return true;
+  }
+
+  HANDLE theme = nullptr;
+  if (aAppearance == StyleAppearance::CheckboxContainer)
+    theme = GetTheme(StyleAppearance::Checkbox);
+  else if (aAppearance == StyleAppearance::RadioContainer)
+    theme = GetTheme(StyleAppearance::Radio);
+  else
+    theme = GetTheme(aAppearance);
+
+  if (theme && aAppearance == StyleAppearance::Resizer) return true;
+
+  if ((theme) || (!theme && ClassicThemeSupportsWidget(aFrame, aAppearance)))
+    // turn off theming for some HTML widgets styled by the page
+    return (!IsWidgetStyled(aPresContext, aFrame, aAppearance));
+
+  return false;
+}
+
+bool nsNativeThemeWin::WidgetIsContainer(StyleAppearance aAppearance) {
+  // XXXdwh At some point flesh all of this out.
+  if (aAppearance == StyleAppearance::MozMenulistArrowButton ||
+      aAppearance == StyleAppearance::Radio ||
+      aAppearance == StyleAppearance::Checkbox)
+    return false;
+  return true;
+}
+
+bool nsNativeThemeWin::ThemeDrawsFocusForWidget(StyleAppearance aAppearance) {
+  switch (aAppearance) {
+    case StyleAppearance::Menulist:
+    case StyleAppearance::MenulistButton:
+    case StyleAppearance::Textarea:
+    case StyleAppearance::Textfield:
+    case StyleAppearance::NumberInput:
+      return true;
+    default:
+      return false;
+  }
+}
+
+bool nsNativeThemeWin::ThemeNeedsComboboxDropmarker() { return true; }
+
+bool nsNativeThemeWin::WidgetAppearanceDependsOnWindowFocus(
+    StyleAppearance aAppearance) {
+  switch (aAppearance) {
+    case StyleAppearance::MozWindowTitlebar:
+    case StyleAppearance::MozWindowTitlebarMaximized:
+    case StyleAppearance::MozWindowFrameLeft:
+    case StyleAppearance::MozWindowFrameRight:
+    case StyleAppearance::MozWindowFrameBottom:
+    case StyleAppearance::MozWindowButtonClose:
+    case StyleAppearance::MozWindowButtonMinimize:
+    case StyleAppearance::MozWindowButtonMaximize:
+    case StyleAppearance::MozWindowButtonRestore:
+      return true;
+    default:
+      return false;
+  }
+}
+
+nsITheme::ThemeGeometryType nsNativeThemeWin::ThemeGeometryTypeForWidget(
+    nsIFrame* aFrame, StyleAppearance aAppearance) {
+  switch (aAppearance) {
+    case StyleAppearance::MozWindowButtonBox:
+    case StyleAppearance::MozWindowButtonBoxMaximized:
+      return eThemeGeometryTypeWindowButtons;
+    default:
+      return eThemeGeometryTypeUnknown;
+  }
+}
+
+nsITheme::Transparency nsNativeThemeWin::GetWidgetTransparency(
+    nsIFrame* aFrame, StyleAppearance aAppearance) {
+  if (auto transparency =
+          ScrollbarUtil::GetScrollbarPartTransparency(aFrame, aAppearance)) {
+    return *transparency;
+  }
+
+  switch (aAppearance) {
+    case StyleAppearance::MozWinGlass:
+    case StyleAppearance::MozWinBorderlessGlass:
+    case StyleAppearance::ProgressBar:
+    case StyleAppearance::Progresschunk:
+    case StyleAppearance::Range:
+      return eTransparent;
+    default:
+      break;
+  }
+
+  HANDLE theme = GetTheme(aAppearance);
+  // For the classic theme we don't really have a way of knowing
+  if (!theme) {
+    // menu backgrounds and tooltips which can't be themed are opaque
+    if (aAppearance == StyleAppearance::Menupopup ||
+        aAppearance == StyleAppearance::Tooltip) {
+      return eOpaque;
+    }
+    return eUnknownTransparency;
+  }
+
+  int32_t part, state;
+  nsresult rv = GetThemePartAndState(aFrame, aAppearance, part, state);
+  // Fail conservatively
+  NS_ENSURE_SUCCESS(rv, eUnknownTransparency);
+
+  if (part <= 0) {
+    // Not a real part code, so IsThemeBackgroundPartiallyTransparent may
+    // not work, so don't call it.
+    return eUnknownTransparency;
+  }
+
+  if (IsThemeBackgroundPartiallyTransparent(theme, part, state))
+    return eTransparent;
+  return eOpaque;
+}
+
+/* Windows 9x/NT/2000/Classic XP Theme Support */
+
+bool nsNativeThemeWin::ClassicThemeSupportsWidget(nsIFrame* aFrame,
+                                                  StyleAppearance aAppearance) {
+  switch (aAppearance) {
+    case StyleAppearance::Resizer: {
+      // The classic native resizer has an opaque grey background which doesn't
+      // match the usually white background of the scrollable container, so
+      // only support the native resizer if not in a scrollframe.
+      nsIFrame* parentFrame = aFrame->GetParent();
+      return !parentFrame || !parentFrame->IsScrollFrame();
+    }
+    case StyleAppearance::Menubar:
+    case StyleAppearance::Menupopup:
+      // Classic non-flat menus are handled almost entirely through CSS.
+      if (!nsUXThemeData::AreFlatMenusEnabled()) return false;
+    case StyleAppearance::Button:
+    case StyleAppearance::NumberInput:
+    case StyleAppearance::Textfield:
+    case StyleAppearance::Textarea:
+    case StyleAppearance::Checkbox:
+    case StyleAppearance::Radio:
+    case StyleAppearance::Range:
+    case StyleAppearance::RangeThumb:
+    case StyleAppearance::Groupbox:
+    case StyleAppearance::ScrollbarbuttonUp:
+    case StyleAppearance::ScrollbarbuttonDown:
+    case StyleAppearance::ScrollbarbuttonLeft:
+    case StyleAppearance::ScrollbarbuttonRight:
+    case StyleAppearance::ScrollbarthumbVertical:
+    case StyleAppearance::ScrollbarthumbHorizontal:
+    case StyleAppearance::ScrollbarVertical:
+    case StyleAppearance::ScrollbarHorizontal:
+    case StyleAppearance::ScrollbarNonDisappearing:
+    case StyleAppearance::Scrollcorner:
+    case StyleAppearance::Menulist:
+    case StyleAppearance::MenulistButton:
+    case StyleAppearance::MozMenulistArrowButton:
+    case StyleAppearance::SpinnerUpbutton:
+    case StyleAppearance::SpinnerDownbutton:
+    case StyleAppearance::Listbox:
+    case StyleAppearance::Treeview:
+    case StyleAppearance::Tooltip:
+    case StyleAppearance::Statusbar:
+    case StyleAppearance::Statusbarpanel:
+    case StyleAppearance::Resizerpanel:
+    case StyleAppearance::ProgressBar:
+    case StyleAppearance::Progresschunk:
+    case StyleAppearance::Tab:
+    case StyleAppearance::Tabpanel:
+    case StyleAppearance::Tabpanels:
+    case StyleAppearance::Menuitem:
+    case StyleAppearance::Checkmenuitem:
+    case StyleAppearance::Radiomenuitem:
+    case StyleAppearance::Menucheckbox:
+    case StyleAppearance::Menuradio:
+    case StyleAppearance::Menuarrow:
+    case StyleAppearance::Menuseparator:
+    case StyleAppearance::Menuitemtext:
+    case StyleAppearance::MozWindowTitlebar:
+    case StyleAppearance::MozWindowTitlebarMaximized:
+    case StyleAppearance::MozWindowFrameLeft:
+    case StyleAppearance::MozWindowFrameRight:
+    case StyleAppearance::MozWindowFrameBottom:
+    case StyleAppearance::MozWindowButtonClose:
+    case StyleAppearance::MozWindowButtonMinimize:
+    case StyleAppearance::MozWindowButtonMaximize:
+    case StyleAppearance::MozWindowButtonRestore:
+    case StyleAppearance::MozWindowButtonBox:
+    case StyleAppearance::MozWindowButtonBoxMaximized:
+      return true;
+    default:
+      return false;
+  }
+}
+
+LayoutDeviceIntMargin nsNativeThemeWin::ClassicGetWidgetBorder(
+    nsDeviceContext* aContext, nsIFrame* aFrame, StyleAppearance aAppearance) {
+  LayoutDeviceIntMargin result;
+  switch (aAppearance) {
+    case StyleAppearance::Groupbox:
+    case StyleAppearance::Button:
+      result.top = result.left = result.bottom = result.right = 2;
+      break;
+    case StyleAppearance::Statusbar:
+      result.bottom = result.left = result.right = 0;
+      result.top = 2;
+      break;
+    case StyleAppearance::Listbox:
+    case StyleAppearance::Treeview:
+    case StyleAppearance::Menulist:
+    case StyleAppearance::MenulistButton:
+    case StyleAppearance::Tab:
+    case StyleAppearance::NumberInput:
+    case StyleAppearance::Textfield:
+    case StyleAppearance::Textarea:
+    case StyleAppearance::FocusOutline:
+      result.top = result.left = result.bottom = result.right = 2;
+      break;
+    case StyleAppearance::Statusbarpanel:
+    case StyleAppearance::Resizerpanel: {
+      result.top = 1;
+      result.left = 1;
+      result.bottom = 1;
+      result.right = aFrame->GetNextSibling() ? 3 : 1;
+      break;
+    }
+    case StyleAppearance::Tooltip:
+      result.top = result.left = result.bottom = result.right = 1;
+      break;
+    case StyleAppearance::ProgressBar:
+      result.top = result.left = result.bottom = result.right = 1;
+      break;
+    case StyleAppearance::Menubar:
+      result.top = result.left = result.bottom = result.right = 0;
+      break;
+    case StyleAppearance::Menupopup:
+      result.top = result.left = result.bottom = result.right = 3;
+      break;
+    default:
+      result.top = result.bottom = result.left = result.right = 0;
+      break;
+  }
+  return result;
+}
+
+bool nsNativeThemeWin::ClassicGetWidgetPadding(nsDeviceContext* aContext,
+                                               nsIFrame* aFrame,
+                                               StyleAppearance aAppearance,
+                                               LayoutDeviceIntMargin* aResult) {
+  switch (aAppearance) {
+    case StyleAppearance::Menuitem:
+    case StyleAppearance::Checkmenuitem:
+    case StyleAppearance::Radiomenuitem: {
+      int32_t part, state;
+      bool focused;
+
+      if (NS_FAILED(ClassicGetThemePartAndState(aFrame, aAppearance, part,
+                                                state, focused)))
+        return false;
+
+      if (part == 1) {  // top-level menu
+        if (nsUXThemeData::AreFlatMenusEnabled() || !(state & DFCS_PUSHED)) {
+          (*aResult).top = (*aResult).bottom = (*aResult).left =
+              (*aResult).right = 2;
+        } else {
+          // make top-level menus look sunken when pushed in the Classic look
+          (*aResult).top = (*aResult).left = 3;
+          (*aResult).bottom = (*aResult).right = 1;
+        }
+      } else {
+        (*aResult).top = 0;
+        (*aResult).bottom = (*aResult).left = (*aResult).right = 2;
+      }
+      return true;
+    }
+    case StyleAppearance::ProgressBar:
+      (*aResult).top = (*aResult).left = (*aResult).bottom = (*aResult).right =
+          1;
+      return true;
+    default:
+      return false;
+  }
+}
+
+nsresult nsNativeThemeWin::ClassicGetMinimumWidgetSize(
+    nsIFrame* aFrame, StyleAppearance aAppearance, LayoutDeviceIntSize* aResult,
+    bool* aIsOverridable) {
+  (*aResult).width = (*aResult).height = 0;
+  *aIsOverridable = true;
+  switch (aAppearance) {
+    case StyleAppearance::Radio:
+    case StyleAppearance::Checkbox:
+      (*aResult).width = (*aResult).height = 13;
+      break;
+    case StyleAppearance::Menucheckbox:
+    case StyleAppearance::Menuradio:
+    case StyleAppearance::Menuarrow:
+      (*aResult).width = ::GetSystemMetrics(SM_CXMENUCHECK);
+      (*aResult).height = ::GetSystemMetrics(SM_CYMENUCHECK);
+      break;
+    case StyleAppearance::SpinnerUpbutton:
+    case StyleAppearance::SpinnerDownbutton:
+      (*aResult).width = ::GetSystemMetrics(SM_CXVSCROLL);
+      (*aResult).height = 8;  // No good metrics available for this
+      *aIsOverridable = false;
+      break;
+    case StyleAppearance::ScrollbarbuttonUp:
+    case StyleAppearance::ScrollbarbuttonDown:
+      // For scrollbar-width:thin, we don't display the buttons.
+      if (!ScrollbarUtil::IsScrollbarWidthThin(aFrame)) {
+        (*aResult).width = ::GetSystemMetrics(SM_CXVSCROLL);
+        (*aResult).height = ::GetSystemMetrics(SM_CYVSCROLL);
+      }
+      *aIsOverridable = false;
+      break;
+    case StyleAppearance::ScrollbarbuttonLeft:
+    case StyleAppearance::ScrollbarbuttonRight:
+      // For scrollbar-width:thin, we don't display the buttons.
+      if (!ScrollbarUtil::IsScrollbarWidthThin(aFrame)) {
+        (*aResult).width = ::GetSystemMetrics(SM_CXHSCROLL);
+        (*aResult).height = ::GetSystemMetrics(SM_CYHSCROLL);
+      }
+      *aIsOverridable = false;
+      break;
+    case StyleAppearance::ScrollbarVertical:
+      // XXX HACK We should be able to have a minimum height for the scrollbar
+      // track.  However, this causes problems when uncollapsing a scrollbar
+      // inside a tree.  See bug 201379 for details.
+
+      //      (*aResult).height = ::GetSystemMetrics(SM_CYVTHUMB) << 1;
+      break;
+    case StyleAppearance::ScrollbarNonDisappearing: {
+      aResult->SizeTo(::GetSystemMetrics(SM_CXVSCROLL),
+                      ::GetSystemMetrics(SM_CYHSCROLL));
+      break;
+    }
+    case StyleAppearance::RangeThumb: {
+      if (IsRangeHorizontal(aFrame)) {
+        (*aResult).width = 12;
+        (*aResult).height = 20;
+      } else {
+        (*aResult).width = 20;
+        (*aResult).height = 12;
+      }
+      *aIsOverridable = false;
+      break;
+    }
+    case StyleAppearance::MozMenulistArrowButton:
+      (*aResult).width = ::GetSystemMetrics(SM_CXVSCROLL);
+      break;
+    case StyleAppearance::Menulist:
+    case StyleAppearance::MenulistButton:
+    case StyleAppearance::Button:
+    case StyleAppearance::Groupbox:
+    case StyleAppearance::Listbox:
+    case StyleAppearance::Treeview:
+    case StyleAppearance::NumberInput:
+    case StyleAppearance::Textfield:
+    case StyleAppearance::Textarea:
+    case StyleAppearance::Statusbar:
+    case StyleAppearance::Statusbarpanel:
+    case StyleAppearance::Resizerpanel:
+    case StyleAppearance::Progresschunk:
+    case StyleAppearance::Tooltip:
+    case StyleAppearance::ProgressBar:
+    case StyleAppearance::Tab:
+    case StyleAppearance::Tabpanel:
+    case StyleAppearance::Tabpanels:
+      // no minimum widget size
+      break;
+    case StyleAppearance::Resizer: {
+      NONCLIENTMETRICS nc;
+      nc.cbSize = sizeof(nc);
+      if (SystemParametersInfo(SPI_GETNONCLIENTMETRICS, sizeof(nc), &nc, 0))
+        (*aResult).width = (*aResult).height =
+            abs(nc.lfStatusFont.lfHeight) + 4;
+      else
+        (*aResult).width = (*aResult).height = 15;
+      *aIsOverridable = false;
+      break;
+    }
+    case StyleAppearance::ScrollbarthumbVertical:
+      (*aResult).width = ::GetSystemMetrics(SM_CXVSCROLL);
+      (*aResult).height = ::GetSystemMetrics(SM_CYVTHUMB);
+      // Without theming, divide the thumb size by two in order to look more
+      // native
+      if (!GetTheme(aAppearance)) {
+        (*aResult).height >>= 1;
+      }
+      // If scrollbar-width is thin, divide the thickness by two to make
+      // it look more compact.
+      if (ScrollbarUtil::IsScrollbarWidthThin(aFrame)) {
+        aResult->width >>= 1;
+      }
+      *aIsOverridable = false;
+      break;
+    case StyleAppearance::ScrollbarthumbHorizontal:
+      (*aResult).width = ::GetSystemMetrics(SM_CXHTHUMB);
+      (*aResult).height = ::GetSystemMetrics(SM_CYHSCROLL);
+      // Without theming, divide the thumb size by two in order to look more
+      // native
+      if (!GetTheme(aAppearance)) {
+        (*aResult).width >>= 1;
+      }
+      // If scrollbar-width is thin, divide the thickness by two to make
+      // it look more compact.
+      if (ScrollbarUtil::IsScrollbarWidthThin(aFrame)) {
+        aResult->height >>= 1;
+      }
+      *aIsOverridable = false;
+      break;
+    case StyleAppearance::ScrollbarHorizontal:
+      (*aResult).width = ::GetSystemMetrics(SM_CXHTHUMB) << 1;
+      break;
+    case StyleAppearance::Menuseparator: {
+      aResult->width = 0;
+      aResult->height = 10;
+      break;
+    }
+
+    case StyleAppearance::MozWindowTitlebarMaximized:
+    case StyleAppearance::MozWindowTitlebar:
+      aResult->height = GetSystemMetrics(SM_CYCAPTION);
+      aResult->height += GetSystemMetrics(SM_CYFRAME);
+      aResult->width = 0;
+      break;
+    case StyleAppearance::MozWindowFrameLeft:
+    case StyleAppearance::MozWindowFrameRight:
+      aResult->width = GetSystemMetrics(SM_CXFRAME);
+      aResult->height = 0;
+      break;
+
+    case StyleAppearance::MozWindowFrameBottom:
+      aResult->height = GetSystemMetrics(SM_CYFRAME);
+      aResult->width = 0;
+      break;
+
+    case StyleAppearance::MozWindowButtonClose:
+    case StyleAppearance::MozWindowButtonMinimize:
+    case StyleAppearance::MozWindowButtonMaximize:
+    case StyleAppearance::MozWindowButtonRestore:
+      aResult->width = GetSystemMetrics(SM_CXSIZE);
+      aResult->height = GetSystemMetrics(SM_CYSIZE);
+      // XXX I have no idea why these caption metrics are always off,
+      // but they are.
+      aResult->width -= 2;
+      aResult->height -= 4;
+      if (aAppearance == StyleAppearance::MozWindowButtonMinimize) {
+        AddPaddingRect(aResult, CAPTIONBUTTON_MINIMIZE);
+      } else if (aAppearance == StyleAppearance::MozWindowButtonMaximize ||
+                 aAppearance == StyleAppearance::MozWindowButtonRestore) {
+        AddPaddingRect(aResult, CAPTIONBUTTON_RESTORE);
+      } else if (aAppearance == StyleAppearance::MozWindowButtonClose) {
+        AddPaddingRect(aResult, CAPTIONBUTTON_CLOSE);
+      }
+      break;
+
+    default:
+      return NS_ERROR_FAILURE;
+  }
+  return NS_OK;
+}
+
+nsresult nsNativeThemeWin::ClassicGetThemePartAndState(
+    nsIFrame* aFrame, StyleAppearance aAppearance, int32_t& aPart,
+    int32_t& aState, bool& aFocused) {
+  aFocused = false;
+  switch (aAppearance) {
+    case StyleAppearance::Button: {
+      EventStates contentState;
+
+      aPart = DFC_BUTTON;
+      aState = DFCS_BUTTONPUSH;
+      aFocused = false;
+
+      contentState = GetContentState(aFrame, aAppearance);
+      if (IsDisabled(aFrame, contentState))
+        aState |= DFCS_INACTIVE;
+      else if (IsOpenButton(aFrame))
+        aState |= DFCS_PUSHED;
+      else if (IsCheckedButton(aFrame))
+        aState |= DFCS_CHECKED;
+      else {
+        if (contentState.HasAllStates(NS_EVENT_STATE_ACTIVE |
+                                      NS_EVENT_STATE_HOVER)) {
+          aState |= DFCS_PUSHED;
+          const nsStyleUI* uiData = aFrame->StyleUI();
+          // The down state is flat if the button is focusable
+          if (uiData->mUserFocus == StyleUserFocus::Normal) {
+            if (!aFrame->GetContent()->IsHTMLElement()) aState |= DFCS_FLAT;
+
+            aFocused = true;
+          }
+        }
+        // On Windows, focused buttons are always drawn as such by the native
+        // theme, that's why we check NS_EVENT_STATE_FOCUS instead of
+        // NS_EVENT_STATE_FOCUSRING.
+        if (contentState.HasState(NS_EVENT_STATE_FOCUS) ||
+            (aState == DFCS_BUTTONPUSH && IsDefaultButton(aFrame))) {
+          aFocused = true;
+        }
+      }
+
+      return NS_OK;
+    }
+    case StyleAppearance::Checkbox:
+    case StyleAppearance::Radio: {
+      EventStates contentState;
+      aFocused = false;
+
+      aPart = DFC_BUTTON;
+      aState = 0;
+      nsIContent* content = aFrame->GetContent();
+      bool isCheckbox = (aAppearance == StyleAppearance::Checkbox);
+      bool isChecked = GetCheckedOrSelected(aFrame, !isCheckbox);
+      bool isIndeterminate = isCheckbox && GetIndeterminate(aFrame);
+
+      if (isCheckbox) {
+        // indeterminate state takes precedence over checkedness.
+        if (isIndeterminate) {
+          aState = DFCS_BUTTON3STATE | DFCS_CHECKED;
+        } else {
+          aState = DFCS_BUTTONCHECK;
+        }
+      } else {
+        aState = DFCS_BUTTONRADIO;
+      }
+      if (isChecked) {
+        aState |= DFCS_CHECKED;
+      }
+
+      contentState = GetContentState(aFrame, aAppearance);
+      if (!content->IsXULElement() &&
+          contentState.HasState(NS_EVENT_STATE_FOCUSRING)) {
+        aFocused = true;
+      }
+
+      if (IsDisabled(aFrame, contentState)) {
+        aState |= DFCS_INACTIVE;
+      } else if (contentState.HasAllStates(NS_EVENT_STATE_ACTIVE |
+                                           NS_EVENT_STATE_HOVER)) {
+        aState |= DFCS_PUSHED;
+      }
+
+      return NS_OK;
+    }
+    case StyleAppearance::Menuitem:
+    case StyleAppearance::Checkmenuitem:
+    case StyleAppearance::Radiomenuitem: {
+      bool isTopLevel = false;
+      bool isOpen = false;
+      nsMenuFrame* menuFrame = do_QueryFrame(aFrame);
+      EventStates eventState = GetContentState(aFrame, aAppearance);
+
+      // We indicate top-level-ness using aPart. 0 is a normal menu item,
+      // 1 is a top-level menu item. The state of the item is composed of
+      // DFCS_* flags only.
+      aPart = 0;
+      aState = 0;
+
+      if (menuFrame) {
+        // If this is a real menu item, we should check if it is part of the
+        // main menu bar or not, and if it is a container, as these affect
+        // rendering.
+        isTopLevel = menuFrame->IsOnMenuBar();
+        isOpen = menuFrame->IsOpen();
+      }
+
+      if (IsDisabled(aFrame, eventState)) aState |= DFCS_INACTIVE;
+
+      if (isTopLevel) {
+        aPart = 1;
+        if (isOpen) aState |= DFCS_PUSHED;
+      }
+
+      if (IsMenuActive(aFrame, aAppearance)) aState |= DFCS_HOT;
+
+      return NS_OK;
+    }
+    case StyleAppearance::Menucheckbox:
+    case StyleAppearance::Menuradio:
+    case StyleAppearance::Menuarrow: {
+      aState = 0;
+      EventStates eventState = GetContentState(aFrame, aAppearance);
+
+      if (IsDisabled(aFrame, eventState)) aState |= DFCS_INACTIVE;
+      if (IsMenuActive(aFrame, aAppearance)) aState |= DFCS_HOT;
+
+      if (aAppearance == StyleAppearance::Menucheckbox ||
+          aAppearance == StyleAppearance::Menuradio) {
+        if (IsCheckedButton(aFrame)) aState |= DFCS_CHECKED;
+      } else if (IsFrameRTL(aFrame)) {
+        aState |= DFCS_RTL;
+      }
+      return NS_OK;
+    }
+    case StyleAppearance::Listbox:
+    case StyleAppearance::Treeview:
+    case StyleAppearance::NumberInput:
+    case StyleAppearance::FocusOutline:
+    case StyleAppearance::Textfield:
+    case StyleAppearance::Textarea:
+    case StyleAppearance::Menulist:
+    case StyleAppearance::MenulistButton:
+    case StyleAppearance::Range:
+    case StyleAppearance::RangeThumb:
+    case StyleAppearance::ScrollbarthumbVertical:
+    case StyleAppearance::ScrollbarthumbHorizontal:
+    case StyleAppearance::ScrollbarVertical:
+    case StyleAppearance::ScrollbarHorizontal:
+    case StyleAppearance::Scrollcorner:
+    case StyleAppearance::Statusbar:
+    case StyleAppearance::Statusbarpanel:
+    case StyleAppearance::Resizerpanel:
+    case StyleAppearance::Progresschunk:
+    case StyleAppearance::Tooltip:
+    case StyleAppearance::ProgressBar:
+    case StyleAppearance::Tab:
+    case StyleAppearance::Tabpanel:
+    case StyleAppearance::Tabpanels:
+    case StyleAppearance::Menubar:
+    case StyleAppearance::Menupopup:
+    case StyleAppearance::Groupbox:
+      // these don't use DrawFrameControl
+      return NS_OK;
+    case StyleAppearance::MozMenulistArrowButton: {
+      aPart = DFC_SCROLL;
+      aState = DFCS_SCROLLCOMBOBOX;
+
+      nsIFrame* parentFrame = aFrame->GetParent();
+      bool isHTML = IsHTMLContent(aFrame);
+      bool isMenulist = !isHTML && parentFrame->IsMenuFrame();
+      bool isOpen = false;
+
+      // HTML select and XUL menulist dropdown buttons get state from the
+      // parent.
+      if (isHTML || isMenulist) aFrame = parentFrame;
+
+      EventStates eventState = GetContentState(aFrame, aAppearance);
+
+      if (IsDisabled(aFrame, eventState)) {
+        aState |= DFCS_INACTIVE;
+        return NS_OK;
+      }
+
+      if (isHTML) {
+        nsComboboxControlFrame* ccf = do_QueryFrame(aFrame);
+        isOpen = (ccf && ccf->IsDroppedDownOrHasParentPopup());
+      } else
+        isOpen = IsOpenButton(aFrame);
+
+      // XXX Button should look active until the mouse is released, but
+      //     without making it look active when the popup is clicked.
+      if (isOpen && (isHTML || isMenulist)) return NS_OK;
+
+      // Dropdown button active state doesn't need :hover.
+      if (eventState.HasState(NS_EVENT_STATE_ACTIVE))
+        aState |= DFCS_PUSHED | DFCS_FLAT;
+
+      return NS_OK;
+    }
+    case StyleAppearance::ScrollbarbuttonUp:
+    case StyleAppearance::ScrollbarbuttonDown:
+    case StyleAppearance::ScrollbarbuttonLeft:
+    case StyleAppearance::ScrollbarbuttonRight: {
+      EventStates contentState = GetContentState(aFrame, aAppearance);
+
+      aPart = DFC_SCROLL;
+      switch (aAppearance) {
+        case StyleAppearance::ScrollbarbuttonUp:
+          aState = DFCS_SCROLLUP;
+          break;
+        case StyleAppearance::ScrollbarbuttonDown:
+          aState = DFCS_SCROLLDOWN;
+          break;
+        case StyleAppearance::ScrollbarbuttonLeft:
+          aState = DFCS_SCROLLLEFT;
+          break;
+        case StyleAppearance::ScrollbarbuttonRight:
+          aState = DFCS_SCROLLRIGHT;
+          break;
+        default:
+          break;
+      }
+
+      if (IsDisabled(aFrame, contentState))
+        aState |= DFCS_INACTIVE;
+      else {
+        if (contentState.HasAllStates(NS_EVENT_STATE_HOVER |
+                                      NS_EVENT_STATE_ACTIVE))
+          aState |= DFCS_PUSHED | DFCS_FLAT;
+      }
+
+      return NS_OK;
+    }
+    case StyleAppearance::SpinnerUpbutton:
+    case StyleAppearance::SpinnerDownbutton: {
+      EventStates contentState = GetContentState(aFrame, aAppearance);
+
+      aPart = DFC_SCROLL;
+      switch (aAppearance) {
+        case StyleAppearance::SpinnerUpbutton:
+          aState = DFCS_SCROLLUP;
+          break;
+        case StyleAppearance::SpinnerDownbutton:
+          aState = DFCS_SCROLLDOWN;
+          break;
+        default:
+          break;
+      }
+
+      if (IsDisabled(aFrame, contentState))
+        aState |= DFCS_INACTIVE;
+      else {
+        if (contentState.HasAllStates(NS_EVENT_STATE_HOVER |
+                                      NS_EVENT_STATE_ACTIVE))
+          aState |= DFCS_PUSHED;
+      }
+
+      return NS_OK;
+    }
+    case StyleAppearance::Resizer:
+      aPart = DFC_SCROLL;
+      aState =
+          (IsFrameRTL(aFrame)) ? DFCS_SCROLLSIZEGRIPRIGHT : DFCS_SCROLLSIZEGRIP;
+      return NS_OK;
+    case StyleAppearance::Menuseparator:
+      aPart = 0;
+      aState = 0;
+      return NS_OK;
+    case StyleAppearance::MozWindowTitlebar:
+      aPart = mozilla::widget::themeconst::WP_CAPTION;
+      aState = GetTopLevelWindowActiveState(aFrame);
+      return NS_OK;
+    case StyleAppearance::MozWindowTitlebarMaximized:
+      aPart = mozilla::widget::themeconst::WP_MAXCAPTION;
+      aState = GetTopLevelWindowActiveState(aFrame);
+      return NS_OK;
+    case StyleAppearance::MozWindowFrameLeft:
+      aPart = mozilla::widget::themeconst::WP_FRAMELEFT;
+      aState = GetTopLevelWindowActiveState(aFrame);
+      return NS_OK;
+    case StyleAppearance::MozWindowFrameRight:
+      aPart = mozilla::widget::themeconst::WP_FRAMERIGHT;
+      aState = GetTopLevelWindowActiveState(aFrame);
+      return NS_OK;
+    case StyleAppearance::MozWindowFrameBottom:
+      aPart = mozilla::widget::themeconst::WP_FRAMEBOTTOM;
+      aState = GetTopLevelWindowActiveState(aFrame);
+      return NS_OK;
+    case StyleAppearance::MozWindowButtonClose:
+      aPart = DFC_CAPTION;
+      aState = DFCS_CAPTIONCLOSE | GetClassicWindowFrameButtonState(
+                                       GetContentState(aFrame, aAppearance));
+      return NS_OK;
+    case StyleAppearance::MozWindowButtonMinimize:
+      aPart = DFC_CAPTION;
+      aState = DFCS_CAPTIONMIN | GetClassicWindowFrameButtonState(
+                                     GetContentState(aFrame, aAppearance));
+      return NS_OK;
+    case StyleAppearance::MozWindowButtonMaximize:
+      aPart = DFC_CAPTION;
+      aState = DFCS_CAPTIONMAX | GetClassicWindowFrameButtonState(
+                                     GetContentState(aFrame, aAppearance));
+      return NS_OK;
+    case StyleAppearance::MozWindowButtonRestore:
+      aPart = DFC_CAPTION;
+      aState = DFCS_CAPTIONRESTORE | GetClassicWindowFrameButtonState(
+                                         GetContentState(aFrame, aAppearance));
+      return NS_OK;
+    default:
+      return NS_ERROR_FAILURE;
+  }
+}
+
+// Draw classic Windows tab
+// (no system API for this, but DrawEdge can draw all the parts of a tab)
+static void DrawTab(HDC hdc, const RECT& R, int32_t aPosition, bool aSelected,
+                    bool aDrawLeft, bool aDrawRight) {
+  int32_t leftFlag, topFlag, rightFlag, lightFlag, shadeFlag;
+  RECT topRect, sideRect, bottomRect, lightRect, shadeRect;
+  int32_t selectedOffset, lOffset, rOffset;
+
+  selectedOffset = aSelected ? 1 : 0;
+  lOffset = aDrawLeft ? 2 : 0;
+  rOffset = aDrawRight ? 2 : 0;
+
+  // Get info for tab orientation/position (Left, Top, Right, Bottom)
+  switch (aPosition) {
+    case BF_LEFT:
+      leftFlag = BF_TOP;
+      topFlag = BF_LEFT;
+      rightFlag = BF_BOTTOM;
+      lightFlag = BF_DIAGONAL_ENDTOPRIGHT;
+      shadeFlag = BF_DIAGONAL_ENDBOTTOMRIGHT;
+
+      ::SetRect(&topRect, R.left, R.top + lOffset, R.right, R.bottom - rOffset);
+      ::SetRect(&sideRect, R.left + 2, R.top, R.right - 2 + selectedOffset,
+                R.bottom);
+      ::SetRect(&bottomRect, R.right - 2, R.top, R.right, R.bottom);
+      ::SetRect(&lightRect, R.left, R.top, R.left + 3, R.top + 3);
+      ::SetRect(&shadeRect, R.left + 1, R.bottom - 2, R.left + 2, R.bottom - 1);
+      break;
+    case BF_TOP:
+      leftFlag = BF_LEFT;
+      topFlag = BF_TOP;
+      rightFlag = BF_RIGHT;
+      lightFlag = BF_DIAGONAL_ENDTOPRIGHT;
+      shadeFlag = BF_DIAGONAL_ENDBOTTOMRIGHT;
+
+      ::SetRect(&topRect, R.left + lOffset, R.top, R.right - rOffset, R.bottom);
+      ::SetRect(&sideRect, R.left, R.top + 2, R.right,
+                R.bottom - 1 + selectedOffset);
+      ::SetRect(&bottomRect, R.left, R.bottom - 1, R.right, R.bottom);
+      ::SetRect(&lightRect, R.left, R.top, R.left + 3, R.top + 3);
+      ::SetRect(&shadeRect, R.right - 2, R.top + 1, R.right - 1, R.top + 2);
+      break;
+    case BF_RIGHT:
+      leftFlag = BF_TOP;
+      topFlag = BF_RIGHT;
+      rightFlag = BF_BOTTOM;
+      lightFlag = BF_DIAGONAL_ENDTOPLEFT;
+      shadeFlag = BF_DIAGONAL_ENDBOTTOMLEFT;
+
+      ::SetRect(&topRect, R.left, R.top + lOffset, R.right, R.bottom - rOffset);
+      ::SetRect(&sideRect, R.left + 2 - selectedOffset, R.top, R.right - 2,
+                R.bottom);
+      ::SetRect(&bottomRect, R.left, R.top, R.left + 2, R.bottom);
+      ::SetRect(&lightRect, R.right - 3, R.top, R.right - 1, R.top + 2);
+      ::SetRect(&shadeRect, R.right - 2, R.bottom - 3, R.right, R.bottom - 1);
+      break;
+    case BF_BOTTOM:
+      leftFlag = BF_LEFT;
+      topFlag = BF_BOTTOM;
+      rightFlag = BF_RIGHT;
+      lightFlag = BF_DIAGONAL_ENDTOPLEFT;
+      shadeFlag = BF_DIAGONAL_ENDBOTTOMLEFT;
+
+      ::SetRect(&topRect, R.left + lOffset, R.top, R.right - rOffset, R.bottom);
+      ::SetRect(&sideRect, R.left, R.top + 2 - selectedOffset, R.right,
+                R.bottom - 2);
+      ::SetRect(&bottomRect, R.left, R.top, R.right, R.top + 2);
+      ::SetRect(&lightRect, R.left, R.bottom - 3, R.left + 2, R.bottom - 1);
+      ::SetRect(&shadeRect, R.right - 2, R.bottom - 3, R.right, R.bottom - 1);
+      break;
+    default:
+      MOZ_CRASH();
+  }
+
+  // Background
+  ::FillRect(hdc, &R, (HBRUSH)(COLOR_3DFACE + 1));
+
+  // Tab "Top"
+  ::DrawEdge(hdc, &topRect, EDGE_RAISED, BF_SOFT | topFlag);
+
+  // Tab "Bottom"
+  if (!aSelected) ::DrawEdge(hdc, &bottomRect, EDGE_RAISED, BF_SOFT | topFlag);
+
+  // Tab "Sides"
+  if (!aDrawLeft) leftFlag = 0;
+  if (!aDrawRight) rightFlag = 0;
+  ::DrawEdge(hdc, &sideRect, EDGE_RAISED, BF_SOFT | leftFlag | rightFlag);
+
+  // Tab Diagonal Corners
+  if (aDrawLeft) ::DrawEdge(hdc, &lightRect, EDGE_RAISED, BF_SOFT | lightFlag);
+
+  if (aDrawRight) ::DrawEdge(hdc, &shadeRect, EDGE_RAISED, BF_SOFT | shadeFlag);
+}
+
+static void DrawMenuImage(HDC hdc, const RECT& rc, int32_t aComponent,
+                          uint32_t aColor) {
+  // This procedure creates a memory bitmap to contain the check mark, draws
+  // it into the bitmap (it is a mask image), then composes it onto the menu
+  // item in appropriate colors.
+  HDC hMemoryDC = ::CreateCompatibleDC(hdc);
+  if (hMemoryDC) {
+    // XXXjgr We should ideally be caching these, but we wont be notified when
+    // they change currently, so we can't do so easily. Same for the bitmap.
+    int checkW = ::GetSystemMetrics(SM_CXMENUCHECK);
+    int checkH = ::GetSystemMetrics(SM_CYMENUCHECK);
+
+    HBITMAP hMonoBitmap = ::CreateBitmap(checkW, checkH, 1, 1, nullptr);
+    if (hMonoBitmap) {
+      HBITMAP hPrevBitmap = (HBITMAP)::SelectObject(hMemoryDC, hMonoBitmap);
+      if (hPrevBitmap) {
+        // XXXjgr This will go pear-shaped if the image is bigger than the
+        // provided rect. What should we do?
+        RECT imgRect = {0, 0, checkW, checkH};
+        POINT imgPos = {rc.left + (rc.right - rc.left - checkW) / 2,
+                        rc.top + (rc.bottom - rc.top - checkH) / 2};
+
+        // XXXzeniko Windows renders these 1px lower than you'd expect
+        if (aComponent == DFCS_MENUCHECK || aComponent == DFCS_MENUBULLET)
+          imgPos.y++;
+
+        ::DrawFrameControl(hMemoryDC, &imgRect, DFC_MENU, aComponent);
+        COLORREF oldTextCol = ::SetTextColor(hdc, 0x00000000);
+        COLORREF oldBackCol = ::SetBkColor(hdc, 0x00FFFFFF);
+        ::BitBlt(hdc, imgPos.x, imgPos.y, checkW, checkH, hMemoryDC, 0, 0,
+                 SRCAND);
+        ::SetTextColor(hdc, ::GetSysColor(aColor));
+        ::SetBkColor(hdc, 0x00000000);
+        ::BitBlt(hdc, imgPos.x, imgPos.y, checkW, checkH, hMemoryDC, 0, 0,
+                 SRCPAINT);
+        ::SetTextColor(hdc, oldTextCol);
+        ::SetBkColor(hdc, oldBackCol);
+        ::SelectObject(hMemoryDC, hPrevBitmap);
+      }
+      ::DeleteObject(hMonoBitmap);
+    }
+    ::DeleteDC(hMemoryDC);
+  }
+}
+
+void nsNativeThemeWin::DrawCheckedRect(HDC hdc, const RECT& rc, int32_t fore,
+                                       int32_t back, HBRUSH defaultBack) {
+  static WORD patBits[8] = {0xaa, 0x55, 0xaa, 0x55, 0xaa, 0x55, 0xaa, 0x55};
+
+  HBITMAP patBmp = ::CreateBitmap(8, 8, 1, 1, patBits);
+  if (patBmp) {
+    HBRUSH brush = (HBRUSH)::CreatePatternBrush(patBmp);
+    if (brush) {
+      COLORREF oldForeColor = ::SetTextColor(hdc, ::GetSysColor(fore));
+      COLORREF oldBackColor = ::SetBkColor(hdc, ::GetSysColor(back));
+      POINT vpOrg;
+
+      ::UnrealizeObject(brush);
+      ::GetViewportOrgEx(hdc, &vpOrg);
+      ::SetBrushOrgEx(hdc, vpOrg.x + rc.left, vpOrg.y + rc.top, nullptr);
+      HBRUSH oldBrush = (HBRUSH)::SelectObject(hdc, brush);
+      ::FillRect(hdc, &rc, brush);
+      ::SetTextColor(hdc, oldForeColor);
+      ::SetBkColor(hdc, oldBackColor);
+      ::SelectObject(hdc, oldBrush);
+      ::DeleteObject(brush);
+    } else
+      ::FillRect(hdc, &rc, defaultBack);
+
+    ::DeleteObject(patBmp);
+  }
+}
+
+nsresult nsNativeThemeWin::ClassicDrawWidgetBackground(
+    gfxContext* aContext, nsIFrame* aFrame, StyleAppearance aAppearance,
+    const nsRect& aRect, const nsRect& aDirtyRect) {
+  int32_t part, state;
+  bool focused;
+  nsresult rv;
+  rv = ClassicGetThemePartAndState(aFrame, aAppearance, part, state, focused);
+  if (NS_FAILED(rv)) return rv;
+
+  if (AssumeThemePartAndStateAreTransparent(part, state)) {
+    return NS_OK;
+  }
+
+  gfxFloat p2a = gfxFloat(aFrame->PresContext()->AppUnitsPerDevPixel());
+  RECT widgetRect;
+  gfxRect tr(aRect.X(), aRect.Y(), aRect.Width(), aRect.Height()),
+      dr(aDirtyRect.X(), aDirtyRect.Y(), aDirtyRect.Width(),
+         aDirtyRect.Height());
+
+  tr.Scale(1.0 / p2a);
+  dr.Scale(1.0 / p2a);
+
+  RefPtr<gfxContext> ctx = aContext;
+
+  gfxWindowsNativeDrawing nativeDrawing(
+      ctx, dr, GetWidgetNativeDrawingFlags(aAppearance));
+
+RENDER_AGAIN:
+
+  HDC hdc = nativeDrawing.BeginNativeDrawing();
+  if (!hdc) return NS_ERROR_FAILURE;
+
+  nativeDrawing.TransformToNativeRect(tr, widgetRect);
+
+  rv = NS_OK;
+  switch (aAppearance) {
+    // Draw button
+    case StyleAppearance::Button: {
+      if (focused) {
+        // draw dark button focus border first
+        HBRUSH brush;
+        brush = ::GetSysColorBrush(COLOR_3DDKSHADOW);
+        if (brush) ::FrameRect(hdc, &widgetRect, brush);
+        InflateRect(&widgetRect, -1, -1);
+      }
+      // fall-through...
+    }
+    // Draw controls supported by DrawFrameControl
+    case StyleAppearance::Checkbox:
+    case StyleAppearance::Radio:
+    case StyleAppearance::ScrollbarbuttonUp:
+    case StyleAppearance::ScrollbarbuttonDown:
+    case StyleAppearance::ScrollbarbuttonLeft:
+    case StyleAppearance::ScrollbarbuttonRight:
+    case StyleAppearance::SpinnerUpbutton:
+    case StyleAppearance::SpinnerDownbutton:
+    case StyleAppearance::MozMenulistArrowButton:
+    case StyleAppearance::Resizer: {
+      int32_t oldTA;
+      // setup DC to make DrawFrameControl draw correctly
+      oldTA = ::SetTextAlign(hdc, TA_TOP | TA_LEFT | TA_NOUPDATECP);
+      ::DrawFrameControl(hdc, &widgetRect, part, state);
+      ::SetTextAlign(hdc, oldTA);
+      break;
+    }
+    // Draw controls with 2px 3D inset border
+    case StyleAppearance::NumberInput:
+    case StyleAppearance::Textfield:
+    case StyleAppearance::Textarea:
+    case StyleAppearance::Listbox:
+    case StyleAppearance::Menulist:
+    case StyleAppearance::MenulistButton: {
+      // Draw inset edge
+      ::DrawEdge(hdc, &widgetRect, EDGE_SUNKEN, BF_RECT | BF_ADJUST);
+
+      EventStates eventState = GetContentState(aFrame, aAppearance);
+
+      // Fill in background
+      if (IsDisabled(aFrame, eventState) ||
+          (aFrame->GetContent()->IsXULElement() && IsReadOnly(aFrame)))
+        ::FillRect(hdc, &widgetRect, (HBRUSH)(COLOR_BTNFACE + 1));
+      else
+        ::FillRect(hdc, &widgetRect, (HBRUSH)(COLOR_WINDOW + 1));
+
+      break;
+    }
+    case StyleAppearance::Treeview: {
+      // Draw inset edge
+      ::DrawEdge(hdc, &widgetRect, EDGE_SUNKEN, BF_RECT | BF_ADJUST);
+
+      // Fill in window color background
+      ::FillRect(hdc, &widgetRect, (HBRUSH)(COLOR_WINDOW + 1));
+
+      break;
+    }
+    // Draw ToolTip background
+    case StyleAppearance::Tooltip:
+      ::FrameRect(hdc, &widgetRect, ::GetSysColorBrush(COLOR_WINDOWFRAME));
+      InflateRect(&widgetRect, -1, -1);
+      ::FillRect(hdc, &widgetRect, ::GetSysColorBrush(COLOR_INFOBK));
+
+      break;
+    case StyleAppearance::Groupbox:
+      ::DrawEdge(hdc, &widgetRect, EDGE_ETCHED, BF_RECT | BF_ADJUST);
+      ::FillRect(hdc, &widgetRect, (HBRUSH)(COLOR_BTNFACE + 1));
+      break;
+    // Draw 3D face background controls
+    case StyleAppearance::ProgressBar:
+      // Draw 3D border
+      ::DrawEdge(hdc, &widgetRect, BDR_SUNKENOUTER, BF_RECT | BF_MIDDLE);
+      InflateRect(&widgetRect, -1, -1);
+      // fall through
+    case StyleAppearance::Tabpanel:
+    case StyleAppearance::Statusbar:
+    case StyleAppearance::Resizerpanel: {
+      ::FillRect(hdc, &widgetRect, (HBRUSH)(COLOR_BTNFACE + 1));
+
+      break;
+    }
+    // Draw 3D inset statusbar panel
+    case StyleAppearance::Statusbarpanel: {
+      if (aFrame->GetNextSibling())
+        widgetRect.right -= 2;  // space between sibling status panels
+
+      ::DrawEdge(hdc, &widgetRect, BDR_SUNKENOUTER, BF_RECT | BF_MIDDLE);
+
+      break;
+    }
+    // Draw scrollbar thumb
+    case StyleAppearance::ScrollbarthumbVertical:
+    case StyleAppearance::ScrollbarthumbHorizontal:
+      ::DrawEdge(hdc, &widgetRect, EDGE_RAISED, BF_RECT | BF_MIDDLE);
+
+      break;
+    case StyleAppearance::RangeThumb: {
+      EventStates eventState = GetContentState(aFrame, aAppearance);
+
+      ::DrawEdge(hdc, &widgetRect, EDGE_RAISED,
+                 BF_RECT | BF_SOFT | BF_MIDDLE | BF_ADJUST);
+      if (IsDisabled(aFrame, eventState)) {
+        DrawCheckedRect(hdc, widgetRect, COLOR_3DFACE, COLOR_3DHILIGHT,
+                        (HBRUSH)COLOR_3DHILIGHT);
+      }
+
+      break;
+    }
+    // Draw scrollbar track background
+    case StyleAppearance::ScrollbarVertical:
+    case StyleAppearance::ScrollbarHorizontal: {
+      // Windows fills in the scrollbar track differently
+      // depending on whether these are equal
+      DWORD color3D, colorScrollbar, colorWindow;
+
+      color3D = ::GetSysColor(COLOR_3DFACE);
+      colorWindow = ::GetSysColor(COLOR_WINDOW);
+      colorScrollbar = ::GetSysColor(COLOR_SCROLLBAR);
+
+      if ((color3D != colorScrollbar) && (colorWindow != colorScrollbar))
+        // Use solid brush
+        ::FillRect(hdc, &widgetRect, (HBRUSH)(COLOR_SCROLLBAR + 1));
+      else {
+        DrawCheckedRect(hdc, widgetRect, COLOR_3DHILIGHT, COLOR_3DFACE,
+                        (HBRUSH)COLOR_SCROLLBAR + 1);
+      }
+      // XXX should invert the part of the track being clicked here
+      // but the track is never :active
+
+      break;
+    }
+    case StyleAppearance::Scrollcorner: {
+      ::FillRect(hdc, &widgetRect, (HBRUSH)(COLOR_SCROLLBAR + 1));
+    }
+    // Draw scale track background
+    case StyleAppearance::Range: {
+      const int32_t trackWidth = 4;
+      // When rounding is necessary, we round the position of the track
+      // away from the chevron of the thumb to make it look better.
+      if (IsRangeHorizontal(aFrame)) {
+        widgetRect.top += (widgetRect.bottom - widgetRect.top - trackWidth) / 2;
+        widgetRect.bottom = widgetRect.top + trackWidth;
+      } else {
+        if (!IsFrameRTL(aFrame)) {
+          widgetRect.left +=
+              (widgetRect.right - widgetRect.left - trackWidth) / 2;
+          widgetRect.right = widgetRect.left + trackWidth;
+        } else {
+          widgetRect.right -=
+              (widgetRect.right - widgetRect.left - trackWidth) / 2;
+          widgetRect.left = widgetRect.right - trackWidth;
+        }
+      }
+
+      ::DrawEdge(hdc, &widgetRect, EDGE_SUNKEN, BF_RECT | BF_ADJUST);
+      ::FillRect(hdc, &widgetRect, (HBRUSH)GetStockObject(GRAY_BRUSH));
+
+      break;
+    }
+    case StyleAppearance::Progresschunk: {
+      nsIFrame* stateFrame = aFrame->GetParent();
+      EventStates eventStates = GetContentState(stateFrame, aAppearance);
+
+      bool indeterminate = IsIndeterminateProgress(stateFrame, eventStates);
+      bool vertical = IsVerticalProgress(stateFrame);
+
+      nsIContent* content = aFrame->GetContent();
+      if (!indeterminate || !content) {
+        ::FillRect(hdc, &widgetRect, (HBRUSH)(COLOR_HIGHLIGHT + 1));
+        break;
+      }
+
+      RECT overlayRect = CalculateProgressOverlayRect(
+          aFrame, &widgetRect, vertical, indeterminate, true);
+
+      ::FillRect(hdc, &overlayRect, (HBRUSH)(COLOR_HIGHLIGHT + 1));
+
+      if (!QueueAnimatedContentForRefresh(aFrame->GetContent(), 30)) {
+        NS_WARNING("unable to animate progress widget!");
+      }
+      break;
+    }
+
+    // Draw Tab
+    case StyleAppearance::Tab: {
+      DrawTab(hdc, widgetRect, IsBottomTab(aFrame) ? BF_BOTTOM : BF_TOP,
+              IsSelectedTab(aFrame), !IsRightToSelectedTab(aFrame),
+              !IsLeftToSelectedTab(aFrame));
+
+      break;
+    }
+    case StyleAppearance::Tabpanels:
+      ::DrawEdge(hdc, &widgetRect, EDGE_RAISED,
+                 BF_SOFT | BF_MIDDLE | BF_LEFT | BF_RIGHT | BF_BOTTOM);
+
+      break;
+    case StyleAppearance::Menubar:
+      break;
+    case StyleAppearance::Menupopup:
+      NS_ASSERTION(nsUXThemeData::AreFlatMenusEnabled(),
+                   "Classic menus are styled entirely through CSS");
+      ::FillRect(hdc, &widgetRect, (HBRUSH)(COLOR_MENU + 1));
+      ::FrameRect(hdc, &widgetRect, ::GetSysColorBrush(COLOR_BTNSHADOW));
+      break;
+    case StyleAppearance::Menuitem:
+    case StyleAppearance::Checkmenuitem:
+    case StyleAppearance::Radiomenuitem:
+      // part == 0 for normal items
+      // part == 1 for top-level menu items
+      if (nsUXThemeData::AreFlatMenusEnabled()) {
+        // Not disabled and hot/pushed.
+        if ((state & (DFCS_HOT | DFCS_PUSHED)) != 0) {
+          ::FillRect(hdc, &widgetRect, (HBRUSH)(COLOR_MENUHILIGHT + 1));
+          ::FrameRect(hdc, &widgetRect, ::GetSysColorBrush(COLOR_HIGHLIGHT));
+        }
+      } else {
+        if (part == 1) {
+          if ((state & DFCS_INACTIVE) == 0) {
+            if ((state & DFCS_PUSHED) != 0) {
+              ::DrawEdge(hdc, &widgetRect, BDR_SUNKENOUTER, BF_RECT);
+            } else if ((state & DFCS_HOT) != 0) {
+              ::DrawEdge(hdc, &widgetRect, BDR_RAISEDINNER, BF_RECT);
+            }
+          }
+        } else {
+          if ((state & (DFCS_HOT | DFCS_PUSHED)) != 0) {
+            ::FillRect(hdc, &widgetRect, (HBRUSH)(COLOR_HIGHLIGHT + 1));
+          }
+        }
+      }
+      break;
+    case StyleAppearance::Menucheckbox:
+    case StyleAppearance::Menuradio:
+      if (!(state & DFCS_CHECKED)) break;  // nothin' to do
+    case StyleAppearance::Menuarrow: {
+      uint32_t color = COLOR_MENUTEXT;
+      if ((state & DFCS_INACTIVE))
+        color = COLOR_GRAYTEXT;
+      else if ((state & DFCS_HOT))
+        color = COLOR_HIGHLIGHTTEXT;
+
+      if (aAppearance == StyleAppearance::Menucheckbox)
+        DrawMenuImage(hdc, widgetRect, DFCS_MENUCHECK, color);
+      else if (aAppearance == StyleAppearance::Menuradio)
+        DrawMenuImage(hdc, widgetRect, DFCS_MENUBULLET, color);
+      else if (aAppearance == StyleAppearance::Menuarrow)
+        DrawMenuImage(hdc, widgetRect,
+                      (state & DFCS_RTL) ? DFCS_MENUARROWRIGHT : DFCS_MENUARROW,
+                      color);
+      break;
+    }
+    case StyleAppearance::Menuseparator: {
+      // separators are offset by a bit (see menu.css)
+      widgetRect.left++;
+      widgetRect.right--;
+
+      // This magic number is brought to you by the value in menu.css
+      widgetRect.top += 4;
+      // Our rectangles are 1 pixel high (see border size in menu.css)
+      widgetRect.bottom = widgetRect.top + 1;
+      ::FillRect(hdc, &widgetRect, (HBRUSH)(COLOR_3DSHADOW + 1));
+      widgetRect.top++;
+      widgetRect.bottom++;
+      ::FillRect(hdc, &widgetRect, (HBRUSH)(COLOR_3DHILIGHT + 1));
+      break;
+    }
+
+    case StyleAppearance::MozWindowTitlebar:
+    case StyleAppearance::MozWindowTitlebarMaximized: {
+      RECT rect = widgetRect;
+      int32_t offset = GetSystemMetrics(SM_CXFRAME);
+
+      // first fill the area to the color of the window background
+      FillRect(hdc, &rect, (HBRUSH)(COLOR_3DFACE + 1));
+
+      // inset the caption area so it doesn't overflow.
+      rect.top += offset;
+      // if enabled, draw a gradient titlebar background, otherwise
+      // fill with a solid color.
+      BOOL bFlag = TRUE;
+      SystemParametersInfo(SPI_GETGRADIENTCAPTIONS, 0, &bFlag, 0);
+      if (!bFlag) {
+        if (state == mozilla::widget::themeconst::FS_ACTIVE)
+          FillRect(hdc, &rect, (HBRUSH)(COLOR_ACTIVECAPTION + 1));
+        else
+          FillRect(hdc, &rect, (HBRUSH)(COLOR_INACTIVECAPTION + 1));
+      } else {
+        DWORD startColor, endColor;
+        if (state == mozilla::widget::themeconst::FS_ACTIVE) {
+          startColor = GetSysColor(COLOR_ACTIVECAPTION);
+          endColor = GetSysColor(COLOR_GRADIENTACTIVECAPTION);
+        } else {
+          startColor = GetSysColor(COLOR_INACTIVECAPTION);
+          endColor = GetSysColor(COLOR_GRADIENTINACTIVECAPTION);
+        }
+
+        TRIVERTEX vertex[2];
+        vertex[0].x = rect.left;
+        vertex[0].y = rect.top;
+        vertex[0].Red = GetRValue(startColor) << 8;
+        vertex[0].Green = GetGValue(startColor) << 8;
+        vertex[0].Blue = GetBValue(startColor) << 8;
+        vertex[0].Alpha = 0;
+
+        vertex[1].x = rect.right;
+        vertex[1].y = rect.bottom;
+        vertex[1].Red = GetRValue(endColor) << 8;
+        vertex[1].Green = GetGValue(endColor) << 8;
+        vertex[1].Blue = GetBValue(endColor) << 8;
+        vertex[1].Alpha = 0;
+
+        GRADIENT_RECT gRect;
+        gRect.UpperLeft = 0;
+        gRect.LowerRight = 1;
+        // available on win2k & up
+        GradientFill(hdc, vertex, 2, &gRect, 1, GRADIENT_FILL_RECT_H);
+      }
+
+      if (aAppearance == StyleAppearance::MozWindowTitlebar) {
+        // frame things up with a top raised border.
+        DrawEdge(hdc, &widgetRect, EDGE_RAISED, BF_TOP);
+      }
+      break;
+    }
+
+    case StyleAppearance::MozWindowFrameLeft:
+      DrawEdge(hdc, &widgetRect, EDGE_RAISED, BF_LEFT);
+      break;
+
+    case StyleAppearance::MozWindowFrameRight:
+      DrawEdge(hdc, &widgetRect, EDGE_RAISED, BF_RIGHT);
+      break;
+
+    case StyleAppearance::MozWindowFrameBottom:
+      DrawEdge(hdc, &widgetRect, EDGE_RAISED, BF_BOTTOM);
+      break;
+
+    case StyleAppearance::MozWindowButtonClose:
+    case StyleAppearance::MozWindowButtonMinimize:
+    case StyleAppearance::MozWindowButtonMaximize:
+    case StyleAppearance::MozWindowButtonRestore: {
+      if (aAppearance == StyleAppearance::MozWindowButtonMinimize) {
+        OffsetBackgroundRect(widgetRect, CAPTIONBUTTON_MINIMIZE);
+      } else if (aAppearance == StyleAppearance::MozWindowButtonMaximize ||
+                 aAppearance == StyleAppearance::MozWindowButtonRestore) {
+        OffsetBackgroundRect(widgetRect, CAPTIONBUTTON_RESTORE);
+      } else if (aAppearance == StyleAppearance::MozWindowButtonClose) {
+        OffsetBackgroundRect(widgetRect, CAPTIONBUTTON_CLOSE);
+      }
+      int32_t oldTA = SetTextAlign(hdc, TA_TOP | TA_LEFT | TA_NOUPDATECP);
+      DrawFrameControl(hdc, &widgetRect, part, state);
+      SetTextAlign(hdc, oldTA);
+      break;
+    }
+
+    default:
+      rv = NS_ERROR_FAILURE;
+      break;
+  }
+
+  nativeDrawing.EndNativeDrawing();
+
+  if (NS_FAILED(rv)) return rv;
+
+  if (nativeDrawing.ShouldRenderAgain()) goto RENDER_AGAIN;
+
+  nativeDrawing.PaintToContext();
+
+  return rv;
+}
+
+uint32_t nsNativeThemeWin::GetWidgetNativeDrawingFlags(
+    StyleAppearance aAppearance) {
+  switch (aAppearance) {
+    case StyleAppearance::Button:
+    case StyleAppearance::NumberInput:
+    case StyleAppearance::FocusOutline:
+    case StyleAppearance::Textfield:
+    case StyleAppearance::Textarea:
+    case StyleAppearance::Menulist:
+    case StyleAppearance::MenulistButton:
+      return gfxWindowsNativeDrawing::CANNOT_DRAW_TO_COLOR_ALPHA |
+             gfxWindowsNativeDrawing::CAN_AXIS_ALIGNED_SCALE |
+             gfxWindowsNativeDrawing::CANNOT_COMPLEX_TRANSFORM;
+
+    // the dropdown button /almost/ renders correctly with scaling,
+    // except that the graphic in the dropdown button (the downward arrow)
+    // doesn't get scaled up.
+    case StyleAppearance::MozMenulistArrowButton:
+    // these are definitely no; they're all graphics that don't get scaled up
+    case StyleAppearance::Checkbox:
+    case StyleAppearance::Radio:
+    case StyleAppearance::Groupbox:
+    case StyleAppearance::Checkmenuitem:
+    case StyleAppearance::Radiomenuitem:
+    case StyleAppearance::Menucheckbox:
+    case StyleAppearance::Menuradio:
+    case StyleAppearance::Menuarrow:
+      return gfxWindowsNativeDrawing::CANNOT_DRAW_TO_COLOR_ALPHA |
+             gfxWindowsNativeDrawing::CANNOT_AXIS_ALIGNED_SCALE |
+             gfxWindowsNativeDrawing::CANNOT_COMPLEX_TRANSFORM;
+
+    // need to check these others
+    default:
+      return gfxWindowsNativeDrawing::CANNOT_DRAW_TO_COLOR_ALPHA |
+             gfxWindowsNativeDrawing::CANNOT_AXIS_ALIGNED_SCALE |
+             gfxWindowsNativeDrawing::CANNOT_COMPLEX_TRANSFORM;
+  }
+}
+
+// This tries to draw a Windows 10 style scrollbar with given colors.
+bool nsNativeThemeWin::MayDrawCustomScrollbarPart(gfxContext* aContext,
+                                                  nsIFrame* aFrame,
+                                                  StyleAppearance aAppearance,
+                                                  const nsRect& aRect,
+                                                  const nsRect& aClipRect) {
+  ComputedStyle* style = ScrollbarUtil::GetCustomScrollbarStyle(aFrame);
+  if (!style) {
+    return false;
+  }
+
+  EventStates eventStates = GetContentState(aFrame, aAppearance);
+
+  gfxContextAutoSaveRestore autoSave(aContext);
+  RefPtr<gfxContext> ctx = aContext;
+  DrawTarget* dt = ctx->GetDrawTarget();
+  gfxFloat p2a = gfxFloat(aFrame->PresContext()->AppUnitsPerDevPixel());
+  gfxRect rect = ThebesRect(NSRectToSnappedRect(aRect, p2a, *dt));
+  gfxRect clipRect = ThebesRect(NSRectToSnappedRect(aClipRect, p2a, *dt));
+  ctx->Clip(clipRect);
+
+  nscolor trackColor = ScrollbarUtil::GetScrollbarTrackColor(aFrame);
+
+  switch (aAppearance) {
+    case StyleAppearance::ScrollbarHorizontal:
+    case StyleAppearance::ScrollbarVertical:
+    case StyleAppearance::Scrollcorner: {
+      ctx->SetColor(sRGBColor::FromABGR(trackColor));
+      ctx->Rectangle(rect);
+      ctx->Fill();
+      return true;
+    }
+    default:
+      break;
+  }
+
+  // Scrollbar thumb and button are two CSS pixels thinner than the track.
+  gfxRect bgRect = rect;
+  gfxFloat dev2css = round(AppUnitsPerCSSPixel() / p2a);
+  switch (aAppearance) {
+    case StyleAppearance::ScrollbarthumbVertical:
+    case StyleAppearance::ScrollbarbuttonUp:
+    case StyleAppearance::ScrollbarbuttonDown:
+      bgRect.Deflate(dev2css, 0);
+      break;
+    case StyleAppearance::ScrollbarthumbHorizontal:
+    case StyleAppearance::ScrollbarbuttonLeft:
+    case StyleAppearance::ScrollbarbuttonRight:
+      bgRect.Deflate(0, dev2css);
+      break;
+    default:
+      MOZ_ASSERT_UNREACHABLE("Unknown widget type");
+  }
+
+  switch (aAppearance) {
+    case StyleAppearance::ScrollbarthumbVertical:
+    case StyleAppearance::ScrollbarthumbHorizontal: {
+      nscolor faceColor =
+          ScrollbarUtil::GetScrollbarThumbColor(aFrame, eventStates);
+      ctx->SetColor(sRGBColor::FromABGR(faceColor));
+      ctx->Rectangle(bgRect);
+      ctx->Fill();
+      break;
+    }
+    case StyleAppearance::ScrollbarbuttonUp:
+    case StyleAppearance::ScrollbarbuttonDown:
+    case StyleAppearance::ScrollbarbuttonLeft:
+    case StyleAppearance::ScrollbarbuttonRight: {
+      nscolor buttonColor =
+          ScrollbarUtil::GetScrollbarButtonColor(trackColor, eventStates);
+      ctx->SetColor(sRGBColor::FromABGR(buttonColor));
+      ctx->Rectangle(bgRect);
+      ctx->Fill();
+
+      // We use the path of scrollbar up arrow on Windows 10 which is
+      // in a 17x17 area.
+      const gfxFloat kSize = 17.0;
+      // Setup the transform matrix.
+      gfxFloat width = rect.Width();
+      gfxFloat height = rect.Height();
+      gfxFloat size = std::min(width, height);
+      gfxFloat left = (width - size) / 2.0 + rect.x;
+      gfxFloat top = (height - size) / 2.0 + rect.y;
+      gfxFloat scale = size / kSize;
+      gfxFloat rad = 0.0;
+      if (aAppearance == StyleAppearance::ScrollbarbuttonRight) {
+        rad = M_PI / 2;
+      } else if (aAppearance == StyleAppearance::ScrollbarbuttonDown) {
+        rad = M_PI;
+      } else if (aAppearance == StyleAppearance::ScrollbarbuttonLeft) {
+        rad = -M_PI / 2;
+      }
+      gfx::Matrix mat = ctx->CurrentMatrix();
+      mat.PreTranslate(left, top);
+      mat.PreScale(scale, scale);
+      if (rad != 0.0) {
+        const gfxFloat kOffset = kSize / 2.0;
+        mat.PreTranslate(kOffset, kOffset);
+        mat.PreRotate(rad);
+        mat.PreTranslate(-kOffset, -kOffset);
+      }
+      ctx->SetMatrix(mat);
+      // The arrow should not have antialias applied.
+      ctx->SetAntialiasMode(gfx::AntialiasMode::NONE);
+      // Set the arrow path.
+      ctx->NewPath();
+      ctx->MoveTo(gfxPoint(5.0, 9.0));
+      ctx->LineTo(gfxPoint(8.5, 6.0));
+      ctx->LineTo(gfxPoint(12.0, 9.0));
+      ctx->LineTo(gfxPoint(12.0, 12.0));
+      ctx->LineTo(gfxPoint(8.5, 9.0));
+      ctx->LineTo(gfxPoint(5.0, 12.0));
+      ctx->ClosePath();
+      // And paint the arrow.
+      nscolor arrowColor = ScrollbarUtil::GetScrollbarArrowColor(buttonColor);
+      ctx->SetColor(sRGBColor::FromABGR(arrowColor));
+      ctx->Fill();
+      break;
+    }
+    default:
+      MOZ_ASSERT_UNREACHABLE("Unknown widget type");
+  }
+  return true;
+}
+
+///////////////////////////////////////////
+// Creation Routine
+///////////////////////////////////////////
+
+already_AddRefed<nsITheme> do_GetNativeThemeDoNotUseDirectly() {
+  static nsCOMPtr<nsITheme> inst;
+
+  if (!inst) {
+    inst = new nsNativeThemeWin();
+    ClearOnShutdown(&inst);
+  }
+
+  return do_AddRef(inst);
+}