1 files changed, 813 insertions, 0 deletions
diff --git a/layout/style/nsMediaFeatures.cpp b/layout/style/nsMediaFeatures.cpp
new file mode 100644
index 000000000..c07a4123e
--- /dev/null
+++ b/layout/style/nsMediaFeatures.cpp
@@ -0,0 +1,813 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* the features that media queries can test */
+
+#include "nsMediaFeatures.h"
+#include "nsGkAtoms.h"
+#include "nsCSSKeywords.h"
+#include "nsStyleConsts.h"
+#include "nsPresContext.h"
+#include "nsCSSValue.h"
+#ifdef XP_WIN
+#include "mozilla/LookAndFeel.h"
+#endif
+#include "nsCSSRuleProcessor.h"
+#include "nsDeviceContext.h"
+#include "nsIBaseWindow.h"
+#include "nsIDocument.h"
+#include "nsContentUtils.h"
+#include "mozilla/StyleSheet.h"
+#include "mozilla/StyleSheetInlines.h"
+
+using namespace mozilla;
+
+static const nsCSSProps::KTableEntry kOrientationKeywords[] = {
+  { eCSSKeyword_portrait,                 NS_STYLE_ORIENTATION_PORTRAIT },
+  { eCSSKeyword_landscape,                NS_STYLE_ORIENTATION_LANDSCAPE },
+  { eCSSKeyword_UNKNOWN,                  -1 }
+};
+
+static const nsCSSProps::KTableEntry kScanKeywords[] = {
+  { eCSSKeyword_progressive,              NS_STYLE_SCAN_PROGRESSIVE },
+  { eCSSKeyword_interlace,                NS_STYLE_SCAN_INTERLACE },
+  { eCSSKeyword_UNKNOWN,                  -1 }
+};
+
+static const nsCSSProps::KTableEntry kDisplayModeKeywords[] = {
+  { eCSSKeyword_browser,                 NS_STYLE_DISPLAY_MODE_BROWSER },
+  { eCSSKeyword_minimal_ui,              NS_STYLE_DISPLAY_MODE_MINIMAL_UI },
+  { eCSSKeyword_standalone,              NS_STYLE_DISPLAY_MODE_STANDALONE },
+  { eCSSKeyword_fullscreen,              NS_STYLE_DISPLAY_MODE_FULLSCREEN },
+  { eCSSKeyword_UNKNOWN,                 -1 }
+};
+
+#ifdef XP_WIN
+struct WindowsThemeName {
+  LookAndFeel::WindowsTheme id;
+  const wchar_t* name;
+};
+
+// Windows theme identities used in the -moz-windows-theme media query.
+const WindowsThemeName themeStrings[] = {
+  { LookAndFeel::eWindowsTheme_Aero,       L"aero" },
+  { LookAndFeel::eWindowsTheme_AeroLite,   L"aero-lite" },
+  { LookAndFeel::eWindowsTheme_LunaBlue,   L"luna-blue" },
+  { LookAndFeel::eWindowsTheme_LunaOlive,  L"luna-olive" },
+  { LookAndFeel::eWindowsTheme_LunaSilver, L"luna-silver" },
+  { LookAndFeel::eWindowsTheme_Royale,     L"royale" },
+  { LookAndFeel::eWindowsTheme_Zune,       L"zune" },
+  { LookAndFeel::eWindowsTheme_Generic,    L"generic" }
+};
+
+struct OperatingSystemVersionInfo {
+  LookAndFeel::OperatingSystemVersion id;
+  const wchar_t* name;
+};
+
+// Os version identities used in the -moz-os-version media query.
+const OperatingSystemVersionInfo osVersionStrings[] = {
+  { LookAndFeel::eOperatingSystemVersion_WindowsXP,     L"windows-xp" },
+  { LookAndFeel::eOperatingSystemVersion_WindowsVista,  L"windows-vista" },
+  { LookAndFeel::eOperatingSystemVersion_Windows7,      L"windows-win7" },
+  { LookAndFeel::eOperatingSystemVersion_Windows8,      L"windows-win8" },
+  { LookAndFeel::eOperatingSystemVersion_Windows10,     L"windows-win10" }
+};
+#endif
+
+// A helper for four features below
+static nsSize
+GetSize(nsPresContext* aPresContext)
+{
+  nsSize size;
+  if (aPresContext->IsRootPaginatedDocument())
+    // We want the page size, including unprintable areas and margins.
+    size = aPresContext->GetPageSize();
+  else
+    size = aPresContext->GetVisibleArea().Size();
+  return size;
+}
+
+static nsresult
+GetWidth(nsPresContext* aPresContext, const nsMediaFeature*,
+         nsCSSValue& aResult)
+{
+  nsSize size = GetSize(aPresContext);
+  float pixelWidth = aPresContext->AppUnitsToFloatCSSPixels(size.width);
+  aResult.SetFloatValue(pixelWidth, eCSSUnit_Pixel);
+  return NS_OK;
+}
+
+static nsresult
+GetHeight(nsPresContext* aPresContext, const nsMediaFeature*,
+          nsCSSValue& aResult)
+{
+  nsSize size = GetSize(aPresContext);
+  float pixelHeight = aPresContext->AppUnitsToFloatCSSPixels(size.height);
+  aResult.SetFloatValue(pixelHeight, eCSSUnit_Pixel);
+  return NS_OK;
+}
+
+inline static nsDeviceContext*
+GetDeviceContextFor(nsPresContext* aPresContext)
+{
+  // It would be nice to call
+  // nsLayoutUtils::GetDeviceContextForScreenInfo here, except for two
+  // things:  (1) it can flush, and flushing is bad here, and (2) it
+  // doesn't really get us consistency in multi-monitor situations
+  // *anyway*.
+  return aPresContext->DeviceContext();
+}
+
+static bool
+ShouldResistFingerprinting(nsPresContext* aPresContext)
+{
+  return nsContentUtils::ShouldResistFingerprinting(aPresContext->GetDocShell());
+}
+
+// A helper for three features below.
+static nsSize
+GetDeviceSize(nsPresContext* aPresContext)
+{
+  nsSize size;
+
+  if (ShouldResistFingerprinting(aPresContext) || aPresContext->IsDeviceSizePageSize()) {
+    size = GetSize(aPresContext);
+  } else if (aPresContext->IsRootPaginatedDocument()) {
+    // We want the page size, including unprintable areas and margins.
+    // XXX The spec actually says we want the "page sheet size", but
+    // how is that different?
+    size = aPresContext->GetPageSize();
+  } else {
+    GetDeviceContextFor(aPresContext)->
+      GetDeviceSurfaceDimensions(size.width, size.height);
+  }
+  return size;
+}
+
+static nsresult
+GetDeviceWidth(nsPresContext* aPresContext, const nsMediaFeature*,
+               nsCSSValue& aResult)
+{
+  nsSize size = GetDeviceSize(aPresContext);
+  float pixelWidth = aPresContext->AppUnitsToFloatCSSPixels(size.width);
+  aResult.SetFloatValue(pixelWidth, eCSSUnit_Pixel);
+  return NS_OK;
+}
+
+static nsresult
+GetDeviceHeight(nsPresContext* aPresContext, const nsMediaFeature*,
+                nsCSSValue& aResult)
+{
+  nsSize size = GetDeviceSize(aPresContext);
+  float pixelHeight = aPresContext->AppUnitsToFloatCSSPixels(size.height);
+  aResult.SetFloatValue(pixelHeight, eCSSUnit_Pixel);
+  return NS_OK;
+}
+
+static nsresult
+GetOrientation(nsPresContext* aPresContext, const nsMediaFeature*,
+               nsCSSValue& aResult)
+{
+  nsSize size = GetSize(aPresContext);
+  int32_t orientation;
+  if (size.width > size.height) {
+    orientation = NS_STYLE_ORIENTATION_LANDSCAPE;
+  } else {
+    // Per spec, square viewports should be 'portrait'
+    orientation = NS_STYLE_ORIENTATION_PORTRAIT;
+  }
+
+  aResult.SetIntValue(orientation, eCSSUnit_Enumerated);
+  return NS_OK;
+}
+
+static nsresult
+GetDeviceOrientation(nsPresContext* aPresContext, const nsMediaFeature*,
+                     nsCSSValue& aResult)
+{
+  nsSize size = GetDeviceSize(aPresContext);
+  int32_t orientation;
+  if (size.width > size.height) {
+    orientation = NS_STYLE_ORIENTATION_LANDSCAPE;
+  } else {
+    // Per spec, square viewports should be 'portrait'
+    orientation = NS_STYLE_ORIENTATION_PORTRAIT;
+  }
+
+  aResult.SetIntValue(orientation, eCSSUnit_Enumerated);
+  return NS_OK;
+}
+
+static nsresult
+GetIsResourceDocument(nsPresContext* aPresContext, const nsMediaFeature*,
+                      nsCSSValue& aResult)
+{
+  nsIDocument* doc = aPresContext->Document();
+  aResult.SetIntValue(doc && doc->IsResourceDoc() ? 1 : 0, eCSSUnit_Integer);
+  return NS_OK;
+}
+
+// Helper for two features below
+static nsresult
+MakeArray(const nsSize& aSize, nsCSSValue& aResult)
+{
+  RefPtr<nsCSSValue::Array> a = nsCSSValue::Array::Create(2);
+
+  a->Item(0).SetIntValue(aSize.width, eCSSUnit_Integer);
+  a->Item(1).SetIntValue(aSize.height, eCSSUnit_Integer);
+
+  aResult.SetArrayValue(a, eCSSUnit_Array);
+  return NS_OK;
+}
+
+static nsresult
+GetAspectRatio(nsPresContext* aPresContext, const nsMediaFeature*,
+               nsCSSValue& aResult)
+{
+  return MakeArray(GetSize(aPresContext), aResult);
+}
+
+static nsresult
+GetDeviceAspectRatio(nsPresContext* aPresContext, const nsMediaFeature*,
+                     nsCSSValue& aResult)
+{
+  return MakeArray(GetDeviceSize(aPresContext), aResult);
+}
+
+static nsresult
+GetColor(nsPresContext* aPresContext, const nsMediaFeature*,
+         nsCSSValue& aResult)
+{
+  uint32_t depth = 24; // Use depth of 24 when resisting fingerprinting.
+
+  if (!ShouldResistFingerprinting(aPresContext)) {
+    // FIXME:  This implementation is bogus.  nsDeviceContext
+    // doesn't provide reliable information (should be fixed in bug
+    // 424386).
+    // FIXME: On a monochrome device, return 0!
+    nsDeviceContext *dx = GetDeviceContextFor(aPresContext);
+    dx->GetDepth(depth);
+  }
+
+  // The spec says to use bits *per color component*, so divide by 3,
+  // and round down, since the spec says to use the smallest when the
+  // color components differ.
+  depth /= 3;
+  aResult.SetIntValue(int32_t(depth), eCSSUnit_Integer);
+  return NS_OK;
+}
+
+static nsresult
+GetColorIndex(nsPresContext* aPresContext, const nsMediaFeature*,
+              nsCSSValue& aResult)
+{
+  // We should return zero if the device does not use a color lookup
+  // table.  Stuart says that our handling of displays with 8-bit
+  // color is bad enough that we never change the lookup table to
+  // match what we're trying to display, so perhaps we should always
+  // return zero.  Given that there isn't any better information
+  // exposed, we don't have much other choice.
+  aResult.SetIntValue(0, eCSSUnit_Integer);
+  return NS_OK;
+}
+
+static nsresult
+GetMonochrome(nsPresContext* aPresContext, const nsMediaFeature*,
+              nsCSSValue& aResult)
+{
+  // For color devices we should return 0.
+  // FIXME: On a monochrome device, return the actual color depth, not
+  // 0!
+  aResult.SetIntValue(0, eCSSUnit_Integer);
+  return NS_OK;
+}
+
+static nsresult
+GetResolution(nsPresContext* aPresContext, const nsMediaFeature*,
+              nsCSSValue& aResult)
+{
+  float dpi = 96; // Use 96 when resisting fingerprinting.
+
+  if (!ShouldResistFingerprinting(aPresContext)) {
+    // Resolution measures device pixels per CSS (inch/cm/pixel).  We
+    // return it in device pixels per CSS inches.
+    dpi = float(nsPresContext::AppUnitsPerCSSInch()) /
+          float(aPresContext->AppUnitsPerDevPixel());
+  }
+
+  aResult.SetFloatValue(dpi, eCSSUnit_Inch);
+  return NS_OK;
+}
+
+static nsresult
+GetScan(nsPresContext* aPresContext, const nsMediaFeature*,
+        nsCSSValue& aResult)
+{
+  // Since Gecko doesn't support the 'tv' media type, the 'scan'
+  // feature is never present.
+  aResult.Reset();
+  return NS_OK;
+}
+
+static nsresult
+GetDisplayMode(nsPresContext* aPresContext, const nsMediaFeature*,
+               nsCSSValue& aResult)
+{
+  nsCOMPtr<nsISupports> container;
+  if (aPresContext) {
+    // Calling GetRootPresContext() can be slow, so make sure to call it
+    // just once.
+    nsRootPresContext* root = aPresContext->GetRootPresContext();
+    if (root && root->Document()) {
+      container = root->Document()->GetContainer();
+    }
+  }
+  nsCOMPtr<nsIBaseWindow> baseWindow = do_QueryInterface(container);
+  if (!baseWindow) {
+    aResult.SetIntValue(NS_STYLE_DISPLAY_MODE_BROWSER, eCSSUnit_Enumerated);
+    return NS_OK;
+  }
+  nsCOMPtr<nsIWidget> mainWidget;
+  baseWindow->GetMainWidget(getter_AddRefs(mainWidget));
+  int32_t displayMode;
+  nsSizeMode mode = mainWidget ? mainWidget->SizeMode() : nsSizeMode_Normal;
+  // Background tabs are always in 'browser' mode for now.
+  // If new modes are supported, please ensure not cause the regression in
+  // Bug 1259641.
+  switch (mode) {
+    case nsSizeMode_Fullscreen:
+      displayMode = NS_STYLE_DISPLAY_MODE_FULLSCREEN;
+      break;
+    default:
+      displayMode = NS_STYLE_DISPLAY_MODE_BROWSER;
+      break;
+  }
+
+  aResult.SetIntValue(displayMode, eCSSUnit_Enumerated);
+  return NS_OK;
+}
+
+static nsresult
+GetGrid(nsPresContext* aPresContext, const nsMediaFeature*,
+        nsCSSValue& aResult)
+{
+  // Gecko doesn't support grid devices (e.g., ttys), so the 'grid'
+  // feature is always 0.
+  aResult.SetIntValue(0, eCSSUnit_Integer);
+  return NS_OK;
+}
+
+static nsresult
+GetDevicePixelRatio(nsPresContext* aPresContext, const nsMediaFeature*,
+                    nsCSSValue& aResult)
+{
+  if (!ShouldResistFingerprinting(aPresContext)) {
+    float ratio = aPresContext->CSSPixelsToDevPixels(1.0f);
+    aResult.SetFloatValue(ratio, eCSSUnit_Number);
+  } else {
+    aResult.SetFloatValue(1.0, eCSSUnit_Number);
+  }
+  return NS_OK;
+}
+
+static nsresult
+GetTransform3d(nsPresContext* aPresContext, const nsMediaFeature*,
+               nsCSSValue& aResult)
+{
+  // Gecko supports 3d transforms, so this feature is always 1.
+  aResult.SetIntValue(1, eCSSUnit_Integer);
+  return NS_OK;
+}
+
+static nsresult
+GetSystemMetric(nsPresContext* aPresContext, const nsMediaFeature* aFeature,
+                nsCSSValue& aResult)
+{
+  aResult.Reset();
+  if (ShouldResistFingerprinting(aPresContext)) {
+    // If "privacy.resistFingerprinting" is enabled, then we simply don't
+    // return any system-backed media feature values. (No spoofed values returned.)
+    return NS_OK;
+  }
+
+  MOZ_ASSERT(aFeature->mValueType == nsMediaFeature::eBoolInteger,
+             "unexpected type");
+  nsIAtom *metricAtom = *aFeature->mData.mMetric;
+  bool hasMetric = nsCSSRuleProcessor::HasSystemMetric(metricAtom);
+  aResult.SetIntValue(hasMetric ? 1 : 0, eCSSUnit_Integer);
+  return NS_OK;
+}
+
+static nsresult
+GetWindowsTheme(nsPresContext* aPresContext, const nsMediaFeature* aFeature,
+                nsCSSValue& aResult)
+{
+  aResult.Reset();
+  if (ShouldResistFingerprinting(aPresContext)) {
+    return NS_OK;
+  }
+
+#ifdef XP_WIN
+  uint8_t windowsThemeId =
+    nsCSSRuleProcessor::GetWindowsThemeIdentifier();
+
+  // Classic mode should fail to match.
+  if (windowsThemeId == LookAndFeel::eWindowsTheme_Classic)
+    return NS_OK;
+
+  // Look up the appropriate theme string
+  for (size_t i = 0; i < ArrayLength(themeStrings); ++i) {
+    if (windowsThemeId == themeStrings[i].id) {
+      aResult.SetStringValue(nsDependentString(themeStrings[i].name),
+                             eCSSUnit_Ident);
+      break;
+    }
+  }
+#endif
+  return NS_OK;
+}
+
+static nsresult
+GetOperatingSystemVersion(nsPresContext* aPresContext, const nsMediaFeature* aFeature,
+                         nsCSSValue& aResult)
+{
+  aResult.Reset();
+  if (ShouldResistFingerprinting(aPresContext)) {
+    return NS_OK;
+  }
+
+#ifdef XP_WIN
+  int32_t metricResult;
+  if (NS_SUCCEEDED(
+        LookAndFeel::GetInt(LookAndFeel::eIntID_OperatingSystemVersionIdentifier,
+                            &metricResult))) {
+    for (size_t i = 0; i < ArrayLength(osVersionStrings); ++i) {
+      if (metricResult == osVersionStrings[i].id) {
+        aResult.SetStringValue(nsDependentString(osVersionStrings[i].name),
+                               eCSSUnit_Ident);
+        break;
+      }
+    }
+  }
+#endif
+  return NS_OK;
+}
+
+static nsresult
+GetIsGlyph(nsPresContext* aPresContext, const nsMediaFeature* aFeature,
+          nsCSSValue& aResult)
+{
+  aResult.SetIntValue(aPresContext->IsGlyph() ? 1 : 0, eCSSUnit_Integer);
+  return NS_OK;
+}
+
+/*
+ * Adding new media features requires (1) adding the new feature to this
+ * array, with appropriate entries (and potentially any new code needed
+ * to support new types in these entries and (2) ensuring that either
+ * nsPresContext::MediaFeatureValuesChanged or
+ * nsPresContext::PostMediaFeatureValuesChangedEvent is called when the
+ * value that would be returned by the entry's mGetter changes.
+ */
+
+/* static */ const nsMediaFeature
+nsMediaFeatures::features[] = {
+  {
+    &nsGkAtoms::width,
+    nsMediaFeature::eMinMaxAllowed,
+    nsMediaFeature::eLength,
+    nsMediaFeature::eNoRequirements,
+    { nullptr },
+    GetWidth
+  },
+  {
+    &nsGkAtoms::height,
+    nsMediaFeature::eMinMaxAllowed,
+    nsMediaFeature::eLength,
+    nsMediaFeature::eNoRequirements,
+    { nullptr },
+    GetHeight
+  },
+  {
+    &nsGkAtoms::deviceWidth,
+    nsMediaFeature::eMinMaxAllowed,
+    nsMediaFeature::eLength,
+    nsMediaFeature::eNoRequirements,
+    { nullptr },
+    GetDeviceWidth
+  },
+  {
+    &nsGkAtoms::deviceHeight,
+    nsMediaFeature::eMinMaxAllowed,
+    nsMediaFeature::eLength,
+    nsMediaFeature::eNoRequirements,
+    { nullptr },
+    GetDeviceHeight
+  },
+  {
+    &nsGkAtoms::orientation,
+    nsMediaFeature::eMinMaxNotAllowed,
+    nsMediaFeature::eEnumerated,
+    nsMediaFeature::eNoRequirements,
+    { kOrientationKeywords },
+    GetOrientation
+  },
+  {
+    &nsGkAtoms::aspectRatio,
+    nsMediaFeature::eMinMaxAllowed,
+    nsMediaFeature::eIntRatio,
+    nsMediaFeature::eNoRequirements,
+    { nullptr },
+    GetAspectRatio
+  },
+  {
+    &nsGkAtoms::deviceAspectRatio,
+    nsMediaFeature::eMinMaxAllowed,
+    nsMediaFeature::eIntRatio,
+    nsMediaFeature::eNoRequirements,
+    { nullptr },
+    GetDeviceAspectRatio
+  },
+  {
+    &nsGkAtoms::color,
+    nsMediaFeature::eMinMaxAllowed,
+    nsMediaFeature::eInteger,
+    nsMediaFeature::eNoRequirements,
+    { nullptr },
+    GetColor
+  },
+  {
+    &nsGkAtoms::colorIndex,
+    nsMediaFeature::eMinMaxAllowed,
+    nsMediaFeature::eInteger,
+    nsMediaFeature::eNoRequirements,
+    { nullptr },
+    GetColorIndex
+  },
+  {
+    &nsGkAtoms::monochrome,
+    nsMediaFeature::eMinMaxAllowed,
+    nsMediaFeature::eInteger,
+    nsMediaFeature::eNoRequirements,
+    { nullptr },
+    GetMonochrome
+  },
+  {
+    &nsGkAtoms::resolution,
+    nsMediaFeature::eMinMaxAllowed,
+    nsMediaFeature::eResolution,
+    nsMediaFeature::eNoRequirements,
+    { nullptr },
+    GetResolution
+  },
+  {
+    &nsGkAtoms::scan,
+    nsMediaFeature::eMinMaxNotAllowed,
+    nsMediaFeature::eEnumerated,
+    nsMediaFeature::eNoRequirements,
+    { kScanKeywords },
+    GetScan
+  },
+  {
+    &nsGkAtoms::grid,
+    nsMediaFeature::eMinMaxNotAllowed,
+    nsMediaFeature::eBoolInteger,
+    nsMediaFeature::eNoRequirements,
+    { nullptr },
+    GetGrid
+  },
+  {
+    &nsGkAtoms::displayMode,
+    nsMediaFeature::eMinMaxNotAllowed,
+    nsMediaFeature::eEnumerated,
+    nsMediaFeature::eNoRequirements,
+    { kDisplayModeKeywords },
+    GetDisplayMode
+  },
+
+  // Webkit extensions that we support for de-facto web compatibility
+  // -webkit-{min|max}-device-pixel-ratio (controlled with its own pref):
+  {
+    &nsGkAtoms::devicePixelRatio,
+    nsMediaFeature::eMinMaxAllowed,
+    nsMediaFeature::eFloat,
+    nsMediaFeature::eHasWebkitPrefix |
+      nsMediaFeature::eWebkitDevicePixelRatioPrefEnabled,
+    { nullptr },
+    GetDevicePixelRatio
+  },
+  // -webkit-transform-3d:
+  {
+    &nsGkAtoms::transform_3d,
+    nsMediaFeature::eMinMaxNotAllowed,
+    nsMediaFeature::eBoolInteger,
+    nsMediaFeature::eHasWebkitPrefix,
+    { nullptr },
+    GetTransform3d
+  },
+
+  // Mozilla extensions
+  {
+    &nsGkAtoms::_moz_device_pixel_ratio,
+    nsMediaFeature::eMinMaxAllowed,
+    nsMediaFeature::eFloat,
+    nsMediaFeature::eNoRequirements,
+    { nullptr },
+    GetDevicePixelRatio
+  },
+  {
+    &nsGkAtoms::_moz_device_orientation,
+    nsMediaFeature::eMinMaxNotAllowed,
+    nsMediaFeature::eEnumerated,
+    nsMediaFeature::eNoRequirements,
+    { kOrientationKeywords },
+    GetDeviceOrientation
+  },
+  {
+    &nsGkAtoms::_moz_is_resource_document,
+    nsMediaFeature::eMinMaxNotAllowed,
+    nsMediaFeature::eBoolInteger,
+    nsMediaFeature::eNoRequirements,
+    { nullptr },
+    GetIsResourceDocument
+  },
+  {
+    &nsGkAtoms::_moz_color_picker_available,
+    nsMediaFeature::eMinMaxNotAllowed,
+    nsMediaFeature::eBoolInteger,
+    nsMediaFeature::eNoRequirements,
+    { &nsGkAtoms::color_picker_available },
+    GetSystemMetric
+  },
+  {
+    &nsGkAtoms::_moz_scrollbar_start_backward,
+    nsMediaFeature::eMinMaxNotAllowed,
+    nsMediaFeature::eBoolInteger,
+    nsMediaFeature::eNoRequirements,
+    { &nsGkAtoms::scrollbar_start_backward },
+    GetSystemMetric
+  },
+  {
+    &nsGkAtoms::_moz_scrollbar_start_forward,
+    nsMediaFeature::eMinMaxNotAllowed,
+    nsMediaFeature::eBoolInteger,
+    nsMediaFeature::eNoRequirements,
+    { &nsGkAtoms::scrollbar_start_forward },
+    GetSystemMetric
+  },
+  {
+    &nsGkAtoms::_moz_scrollbar_end_backward,
+    nsMediaFeature::eMinMaxNotAllowed,
+    nsMediaFeature::eBoolInteger,
+    nsMediaFeature::eNoRequirements,
+    { &nsGkAtoms::scrollbar_end_backward },
+    GetSystemMetric
+  },
+  {
+    &nsGkAtoms::_moz_scrollbar_end_forward,
+    nsMediaFeature::eMinMaxNotAllowed,
+    nsMediaFeature::eBoolInteger,
+    nsMediaFeature::eNoRequirements,
+    { &nsGkAtoms::scrollbar_end_forward },
+    GetSystemMetric
+  },
+  {
+    &nsGkAtoms::_moz_scrollbar_thumb_proportional,
+    nsMediaFeature::eMinMaxNotAllowed,
+    nsMediaFeature::eBoolInteger,
+    nsMediaFeature::eNoRequirements,
+    { &nsGkAtoms::scrollbar_thumb_proportional },
+    GetSystemMetric
+  },
+  {
+    &nsGkAtoms::_moz_overlay_scrollbars,
+    nsMediaFeature::eMinMaxNotAllowed,
+    nsMediaFeature::eBoolInteger,
+    nsMediaFeature::eNoRequirements,
+    { &nsGkAtoms::overlay_scrollbars },
+    GetSystemMetric
+  },
+  {
+    &nsGkAtoms::_moz_windows_default_theme,
+    nsMediaFeature::eMinMaxNotAllowed,
+    nsMediaFeature::eBoolInteger,
+    nsMediaFeature::eNoRequirements,
+    { &nsGkAtoms::windows_default_theme },
+    GetSystemMetric
+  },
+  {
+    &nsGkAtoms::_moz_mac_graphite_theme,
+    nsMediaFeature::eMinMaxNotAllowed,
+    nsMediaFeature::eBoolInteger,
+    nsMediaFeature::eNoRequirements,
+    { &nsGkAtoms::mac_graphite_theme },
+    GetSystemMetric
+  },
+  {
+    &nsGkAtoms::_moz_mac_yosemite_theme,
+    nsMediaFeature::eMinMaxNotAllowed,
+    nsMediaFeature::eBoolInteger,
+    nsMediaFeature::eNoRequirements,
+    { &nsGkAtoms::mac_yosemite_theme },
+    GetSystemMetric
+  },
+  {
+    &nsGkAtoms::_moz_windows_compositor,
+    nsMediaFeature::eMinMaxNotAllowed,
+    nsMediaFeature::eBoolInteger,
+    nsMediaFeature::eNoRequirements,
+    { &nsGkAtoms::windows_compositor },
+    GetSystemMetric
+  },
+  {
+    &nsGkAtoms::_moz_windows_classic,
+    nsMediaFeature::eMinMaxNotAllowed,
+    nsMediaFeature::eBoolInteger,
+    nsMediaFeature::eNoRequirements,
+    { &nsGkAtoms::windows_classic },
+    GetSystemMetric
+  },
+  {
+    &nsGkAtoms::_moz_windows_glass,
+    nsMediaFeature::eMinMaxNotAllowed,
+    nsMediaFeature::eBoolInteger,
+    nsMediaFeature::eNoRequirements,
+    { &nsGkAtoms::windows_glass },
+    GetSystemMetric
+  },
+  {
+    &nsGkAtoms::_moz_touch_enabled,
+    nsMediaFeature::eMinMaxNotAllowed,
+    nsMediaFeature::eBoolInteger,
+    nsMediaFeature::eNoRequirements,
+    { &nsGkAtoms::touch_enabled },
+    GetSystemMetric
+  },
+  {
+    &nsGkAtoms::_moz_menubar_drag,
+    nsMediaFeature::eMinMaxNotAllowed,
+    nsMediaFeature::eBoolInteger,
+    nsMediaFeature::eNoRequirements,
+    { &nsGkAtoms::menubar_drag },
+    GetSystemMetric
+  },
+  {
+    &nsGkAtoms::_moz_windows_theme,
+    nsMediaFeature::eMinMaxNotAllowed,
+    nsMediaFeature::eIdent,
+    nsMediaFeature::eNoRequirements,
+    { nullptr },
+    GetWindowsTheme
+  },
+  {
+    &nsGkAtoms::_moz_os_version,
+    nsMediaFeature::eMinMaxNotAllowed,
+    nsMediaFeature::eIdent,
+    nsMediaFeature::eNoRequirements,
+    { nullptr },
+    GetOperatingSystemVersion
+  },
+
+  {
+    &nsGkAtoms::_moz_swipe_animation_enabled,
+    nsMediaFeature::eMinMaxNotAllowed,
+    nsMediaFeature::eBoolInteger,
+    nsMediaFeature::eNoRequirements,
+    { &nsGkAtoms::swipe_animation_enabled },
+    GetSystemMetric
+  },
+
+  {
+    &nsGkAtoms::_moz_physical_home_button,
+    nsMediaFeature::eMinMaxNotAllowed,
+    nsMediaFeature::eBoolInteger,
+    nsMediaFeature::eNoRequirements,
+    { &nsGkAtoms::physical_home_button },
+    GetSystemMetric
+  },
+
+  // Internal -moz-is-glyph media feature: applies only inside SVG glyphs.
+  // Internal because it is really only useful in the user agent anyway
+  //  and therefore not worth standardizing.
+  {
+    &nsGkAtoms::_moz_is_glyph,
+    nsMediaFeature::eMinMaxNotAllowed,
+    nsMediaFeature::eBoolInteger,
+    nsMediaFeature::eNoRequirements,
+    { nullptr },
+    GetIsGlyph
+  },
+  // Null-mName terminator:
+  {
+    nullptr,
+    nsMediaFeature::eMinMaxAllowed,
+    nsMediaFeature::eInteger,
+    nsMediaFeature::eNoRequirements,
+    { nullptr },
+    nullptr
+  },
+};