diff -r 000000000000 -r 6474c204b198 widget/cocoa/nsLookAndFeel.mm
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/widget/cocoa/nsLookAndFeel.mm	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,625 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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 "nsLookAndFeel.h"
+#include "nsCocoaFeatures.h"
+#include "nsIServiceManager.h"
+#include "nsNativeThemeColors.h"
+#include "nsStyleConsts.h"
+#include "nsCocoaFeatures.h"
+#include "gfxFont.h"
+#include "gfxFontConstants.h"
+#include "mozilla/gfx/2D.h"
+
+#import <Cocoa/Cocoa.h>
+
+// This must be included last:
+#include "nsObjCExceptions.h"
+
+enum {
+  mozNSScrollerStyleLegacy       = 0,
+  mozNSScrollerStyleOverlay      = 1
+};
+typedef NSInteger mozNSScrollerStyle;
+
+@interface NSScroller(AvailableSinceLion)
++ (mozNSScrollerStyle)preferredScrollerStyle;
+@end
+
+nsLookAndFeel::nsLookAndFeel() : nsXPLookAndFeel()
+{
+}
+
+nsLookAndFeel::~nsLookAndFeel()
+{
+}
+
+static nscolor GetColorFromNSColor(NSColor* aColor)
+{
+  NSColor* deviceColor = [aColor colorUsingColorSpaceName:NSDeviceRGBColorSpace];
+  return NS_RGB((unsigned int)([deviceColor redComponent] * 255.0),
+                (unsigned int)([deviceColor greenComponent] * 255.0),
+                (unsigned int)([deviceColor blueComponent] * 255.0));
+}
+
+nsresult
+nsLookAndFeel::NativeGetColor(ColorID aID, nscolor &aColor)
+{
+  NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
+
+  nsresult res = NS_OK;
+  
+  switch (aID) {
+    case eColorID_WindowBackground:
+      aColor = NS_RGB(0xff,0xff,0xff);
+      break;
+    case eColorID_WindowForeground:
+      aColor = NS_RGB(0x00,0x00,0x00);        
+      break;
+    case eColorID_WidgetBackground:
+      aColor = NS_RGB(0xdd,0xdd,0xdd);
+      break;
+    case eColorID_WidgetForeground:
+      aColor = NS_RGB(0x00,0x00,0x00);        
+      break;
+    case eColorID_WidgetSelectBackground:
+      aColor = NS_RGB(0x80,0x80,0x80);
+      break;
+    case eColorID_WidgetSelectForeground:
+      aColor = NS_RGB(0x00,0x00,0x80);
+      break;
+    case eColorID_Widget3DHighlight:
+      aColor = NS_RGB(0xa0,0xa0,0xa0);
+      break;
+    case eColorID_Widget3DShadow:
+      aColor = NS_RGB(0x40,0x40,0x40);
+      break;
+    case eColorID_TextBackground:
+      aColor = NS_RGB(0xff,0xff,0xff);
+      break;
+    case eColorID_TextForeground:
+      aColor = NS_RGB(0x00,0x00,0x00);
+      break;
+    case eColorID_TextSelectBackground:
+      aColor = GetColorFromNSColor([NSColor selectedTextBackgroundColor]);
+      break;
+    case eColorID_highlight: // CSS2 color
+      aColor = GetColorFromNSColor([NSColor alternateSelectedControlColor]);
+      break;
+    case eColorID__moz_menuhover:
+      aColor = GetColorFromNSColor([NSColor alternateSelectedControlColor]);
+      break;      
+    case eColorID_TextSelectForeground:
+      GetColor(eColorID_TextSelectBackground, aColor);
+      if (aColor == 0x000000)
+        aColor = NS_RGB(0xff,0xff,0xff);
+      else
+        aColor = NS_DONT_CHANGE_COLOR;
+      break;
+    case eColorID_highlighttext:  // CSS2 color
+    case eColorID__moz_menuhovertext:
+      aColor = GetColorFromNSColor([NSColor alternateSelectedControlTextColor]);
+      break;
+    case eColorID_IMESelectedRawTextBackground:
+    case eColorID_IMESelectedConvertedTextBackground:
+    case eColorID_IMERawInputBackground:
+    case eColorID_IMEConvertedTextBackground:
+      aColor = NS_TRANSPARENT;
+      break;
+    case eColorID_IMESelectedRawTextForeground:
+    case eColorID_IMESelectedConvertedTextForeground:
+    case eColorID_IMERawInputForeground:
+    case eColorID_IMEConvertedTextForeground:
+      aColor = NS_SAME_AS_FOREGROUND_COLOR;
+      break;
+    case eColorID_IMERawInputUnderline:
+    case eColorID_IMEConvertedTextUnderline:
+      aColor = NS_40PERCENT_FOREGROUND_COLOR;
+      break;
+    case eColorID_IMESelectedRawTextUnderline:
+    case eColorID_IMESelectedConvertedTextUnderline:
+      aColor = NS_SAME_AS_FOREGROUND_COLOR;
+      break;
+    case eColorID_SpellCheckerUnderline:
+      aColor = NS_RGB(0xff, 0, 0);
+      break;
+
+      //
+      // css2 system colors http://www.w3.org/TR/REC-CSS2/ui.html#system-colors
+      //
+      // It's really hard to effectively map these to the Appearance Manager properly,
+      // since they are modeled word for word after the win32 system colors and don't have any 
+      // real counterparts in the Mac world. I'm sure we'll be tweaking these for 
+      // years to come. 
+      //
+      // Thanks to mpt26@student.canterbury.ac.nz for the hardcoded values that form the defaults
+      //  if querying the Appearance Manager fails ;)
+      //
+      
+    case eColorID_buttontext:
+    case eColorID__moz_buttonhovertext:
+      aColor = GetColorFromNSColor([NSColor controlTextColor]);
+      break;
+    case eColorID_captiontext:
+    case eColorID_menutext:
+    case eColorID_infotext:
+    case eColorID__moz_menubartext:
+      aColor = GetColorFromNSColor([NSColor textColor]);
+      break;
+    case eColorID_windowtext:
+      aColor = GetColorFromNSColor([NSColor windowFrameTextColor]);
+      break;
+    case eColorID_activecaption:
+      aColor = GetColorFromNSColor([NSColor gridColor]);
+      break;
+    case eColorID_activeborder:
+      aColor = NS_RGB(0x00,0x00,0x00);
+      break;
+     case eColorID_appworkspace:
+      aColor = NS_RGB(0xFF,0xFF,0xFF);
+      break;
+    case eColorID_background:
+      aColor = NS_RGB(0x63,0x63,0xCE);
+      break;
+    case eColorID_buttonface:
+    case eColorID__moz_buttonhoverface:
+      aColor = NS_RGB(0xF0,0xF0,0xF0);
+      break;
+    case eColorID_buttonhighlight:
+      aColor = NS_RGB(0xFF,0xFF,0xFF);
+      break;
+    case eColorID_buttonshadow:
+      aColor = NS_RGB(0xDC,0xDC,0xDC);
+      break;
+    case eColorID_graytext:
+      aColor = GetColorFromNSColor([NSColor disabledControlTextColor]);
+      break;
+    case eColorID_inactiveborder:
+      aColor = GetColorFromNSColor([NSColor controlBackgroundColor]);
+      break;
+    case eColorID_inactivecaption:
+      aColor = GetColorFromNSColor([NSColor controlBackgroundColor]);
+      break;
+    case eColorID_inactivecaptiontext:
+      aColor = NS_RGB(0x45,0x45,0x45);
+      break;
+    case eColorID_scrollbar:
+      aColor = GetColorFromNSColor([NSColor scrollBarColor]);
+      break;
+    case eColorID_threeddarkshadow:
+      aColor = NS_RGB(0xDC,0xDC,0xDC);
+      break;
+    case eColorID_threedshadow:
+      aColor = NS_RGB(0xE0,0xE0,0xE0);
+      break;
+    case eColorID_threedface:
+      aColor = NS_RGB(0xF0,0xF0,0xF0);
+      break;
+    case eColorID_threedhighlight:
+      aColor = GetColorFromNSColor([NSColor highlightColor]);
+      break;
+    case eColorID_threedlightshadow:
+      aColor = NS_RGB(0xDA,0xDA,0xDA);
+      break;
+    case eColorID_menu:
+      aColor = GetColorFromNSColor([NSColor alternateSelectedControlTextColor]);
+      break;
+    case eColorID_infobackground:
+      aColor = NS_RGB(0xFF,0xFF,0xC7);
+      break;
+    case eColorID_windowframe:
+      aColor = GetColorFromNSColor([NSColor gridColor]);
+      break;
+    case eColorID_window:
+    case eColorID__moz_field:
+    case eColorID__moz_combobox:
+      aColor = NS_RGB(0xff,0xff,0xff);
+      break;
+    case eColorID__moz_fieldtext:
+    case eColorID__moz_comboboxtext:
+      aColor = GetColorFromNSColor([NSColor controlTextColor]);
+      break;
+    case eColorID__moz_dialog:
+      aColor = GetColorFromNSColor([NSColor controlHighlightColor]);
+      break;
+    case eColorID__moz_dialogtext:
+    case eColorID__moz_cellhighlighttext:
+    case eColorID__moz_html_cellhighlighttext:
+      aColor = GetColorFromNSColor([NSColor controlTextColor]);
+      break;
+    case eColorID__moz_dragtargetzone:
+      aColor = GetColorFromNSColor([NSColor selectedControlColor]);
+      break;
+    case eColorID__moz_mac_chrome_active:
+    case eColorID__moz_mac_chrome_inactive: {
+      int grey = NativeGreyColorAsInt(toolbarFillGrey, (aID == eColorID__moz_mac_chrome_active));
+      aColor = NS_RGB(grey, grey, grey);
+    }
+      break;
+    case eColorID__moz_mac_focusring:
+      aColor = GetColorFromNSColor([NSColor keyboardFocusIndicatorColor]);
+      break;
+    case eColorID__moz_mac_menushadow:
+      aColor = NS_RGB(0xA3,0xA3,0xA3);
+      break;          
+    case eColorID__moz_mac_menutextdisable:
+      aColor = NS_RGB(0x88,0x88,0x88);
+      break;      
+    case eColorID__moz_mac_menutextselect:
+      aColor = GetColorFromNSColor([NSColor selectedMenuItemTextColor]);
+      break;      
+    case eColorID__moz_mac_disabledtoolbartext:
+      aColor = GetColorFromNSColor([NSColor disabledControlTextColor]);
+      break;
+    case eColorID__moz_mac_menuselect:
+      aColor = GetColorFromNSColor([NSColor alternateSelectedControlColor]);
+      break;
+    case eColorID__moz_buttondefault:
+      aColor = NS_RGB(0xDC,0xDC,0xDC);
+      break;
+    case eColorID__moz_cellhighlight:
+    case eColorID__moz_html_cellhighlight:
+    case eColorID__moz_mac_secondaryhighlight:
+      // For inactive list selection
+      aColor = GetColorFromNSColor([NSColor secondarySelectedControlColor]);
+      break;
+    case eColorID__moz_eventreerow:
+      // Background color of even list rows.
+      aColor = GetColorFromNSColor([[NSColor controlAlternatingRowBackgroundColors] objectAtIndex:0]);
+      break;
+    case eColorID__moz_oddtreerow:
+      // Background color of odd list rows.
+      aColor = GetColorFromNSColor([[NSColor controlAlternatingRowBackgroundColors] objectAtIndex:1]);
+      break;
+    case eColorID__moz_nativehyperlinktext:
+      // There appears to be no available system defined color. HARDCODING to the appropriate color.
+      aColor = NS_RGB(0x14,0x4F,0xAE);
+      break;
+    default:
+      NS_WARNING("Someone asked nsILookAndFeel for a color I don't know about");
+      aColor = NS_RGB(0xff,0xff,0xff);
+      res = NS_ERROR_FAILURE;
+      break;
+    }
+  
+  return res;
+
+  NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
+}
+
+nsresult
+nsLookAndFeel::GetIntImpl(IntID aID, int32_t &aResult)
+{
+  NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
+
+  nsresult res = nsXPLookAndFeel::GetIntImpl(aID, aResult);
+  if (NS_SUCCEEDED(res))
+    return res;
+  res = NS_OK;
+  
+  switch (aID) {
+    case eIntID_CaretBlinkTime:
+      aResult = 567;
+      break;
+    case eIntID_CaretWidth:
+      aResult = 1;
+      break;
+    case eIntID_ShowCaretDuringSelection:
+      aResult = 0;
+      break;
+    case eIntID_SelectTextfieldsOnKeyFocus:
+      // Select textfield content when focused by kbd
+      // used by EventStateManager::sTextfieldSelectModel
+      aResult = 1;
+      break;
+    case eIntID_SubmenuDelay:
+      aResult = 200;
+      break;
+    case eIntID_TooltipDelay:
+      aResult = 500;
+      break;
+    case eIntID_MenusCanOverlapOSBar:
+      // xul popups are not allowed to overlap the menubar.
+      aResult = 0;
+      break;
+    case eIntID_SkipNavigatingDisabledMenuItem:
+      aResult = 1;
+      break;
+    case eIntID_DragThresholdX:
+    case eIntID_DragThresholdY:
+      aResult = 4;
+      break;
+    case eIntID_ScrollArrowStyle:
+      if (nsCocoaFeatures::OnLionOrLater()) {
+        // OS X Lion's scrollbars have no arrows
+        aResult = eScrollArrow_None;
+      } else {
+        NSString *buttonPlacement = [[NSUserDefaults standardUserDefaults] objectForKey:@"AppleScrollBarVariant"];
+        if ([buttonPlacement isEqualToString:@"Single"]) {
+          aResult = eScrollArrowStyle_Single;
+        } else if ([buttonPlacement isEqualToString:@"DoubleMin"]) {
+          aResult = eScrollArrowStyle_BothAtTop;
+        } else if ([buttonPlacement isEqualToString:@"DoubleBoth"]) {
+          aResult = eScrollArrowStyle_BothAtEachEnd;
+        } else {
+          aResult = eScrollArrowStyle_BothAtBottom; // The default is BothAtBottom.
+        }
+      }
+      break;
+    case eIntID_ScrollSliderStyle:
+      aResult = eScrollThumbStyle_Proportional;
+      break;
+    case eIntID_UseOverlayScrollbars:
+      aResult = SystemWantsOverlayScrollbars() ? 1 : 0;
+      break;
+    case eIntID_AllowOverlayScrollbarsOverlap:
+      aResult = AllowOverlayScrollbarsOverlap() ? 1 : 0;
+      break;
+    case eIntID_ScrollbarDisplayOnMouseMove:
+      aResult = 0;
+      break;
+    case eIntID_ScrollbarFadeBeginDelay:
+      aResult = 450;
+      break;
+    case eIntID_ScrollbarFadeDuration:
+      aResult = 200;
+      break;
+    case eIntID_TreeOpenDelay:
+      aResult = 1000;
+      break;
+    case eIntID_TreeCloseDelay:
+      aResult = 1000;
+      break;
+    case eIntID_TreeLazyScrollDelay:
+      aResult = 150;
+      break;
+    case eIntID_TreeScrollDelay:
+      aResult = 100;
+      break;
+    case eIntID_TreeScrollLinesMax:
+      aResult = 3;
+      break;
+    case eIntID_DWMCompositor:
+    case eIntID_WindowsClassic:
+    case eIntID_WindowsDefaultTheme:
+    case eIntID_TouchEnabled:
+    case eIntID_WindowsThemeIdentifier:
+    case eIntID_OperatingSystemVersionIdentifier:
+      aResult = 0;
+      res = NS_ERROR_NOT_IMPLEMENTED;
+      break;
+    case eIntID_MacGraphiteTheme:
+      aResult = [NSColor currentControlTint] == NSGraphiteControlTint;
+      break;
+    case eIntID_MacLionTheme:
+      aResult = nsCocoaFeatures::OnLionOrLater();
+      break;
+    case eIntID_AlertNotificationOrigin:
+      aResult = NS_ALERT_TOP;
+      break;
+    case eIntID_TabFocusModel:
+    {
+      // we should probably cache this
+      CFPropertyListRef fullKeyboardAccessProperty;
+      fullKeyboardAccessProperty = ::CFPreferencesCopyValue(CFSTR("AppleKeyboardUIMode"),
+                                                            kCFPreferencesAnyApplication,
+                                                            kCFPreferencesCurrentUser,
+                                                            kCFPreferencesAnyHost);
+      aResult = 1;    // default to just textboxes
+      if (fullKeyboardAccessProperty) {
+        int32_t fullKeyboardAccessPrefVal;
+        if (::CFNumberGetValue((CFNumberRef) fullKeyboardAccessProperty, kCFNumberIntType, &fullKeyboardAccessPrefVal)) {
+          // the second bit means  "Full keyboard access" is on
+          if (fullKeyboardAccessPrefVal & (1 << 1))
+            aResult = 7; // everything that can be focused
+        }
+        ::CFRelease(fullKeyboardAccessProperty);
+      }
+    }
+      break;
+    case eIntID_ScrollToClick:
+    {
+      aResult = [[NSUserDefaults standardUserDefaults] boolForKey:@"AppleScrollerPagingBehavior"];
+    }
+      break;
+    case eIntID_ChosenMenuItemsShouldBlink:
+      aResult = 1;
+      break;
+    case eIntID_IMERawInputUnderlineStyle:
+    case eIntID_IMEConvertedTextUnderlineStyle:
+    case eIntID_IMESelectedRawTextUnderlineStyle:
+    case eIntID_IMESelectedConvertedTextUnderline:
+      aResult = NS_STYLE_TEXT_DECORATION_STYLE_SOLID;
+      break;
+    case eIntID_SpellCheckerUnderlineStyle:
+      aResult = NS_STYLE_TEXT_DECORATION_STYLE_DOTTED;
+      break;
+    case eIntID_ScrollbarButtonAutoRepeatBehavior:
+      aResult = 0;
+      break;
+    case eIntID_SwipeAnimationEnabled:
+      aResult = 0;
+      if ([NSEvent respondsToSelector:@selector(
+            isSwipeTrackingFromScrollEventsEnabled)]) {
+        aResult = [NSEvent isSwipeTrackingFromScrollEventsEnabled] ? 1 : 0;
+      }
+      break;
+    case eIntID_ColorPickerAvailable:
+      aResult = 1;
+      break;
+    default:
+      aResult = 0;
+      res = NS_ERROR_FAILURE;
+  }
+  return res;
+
+  NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
+}
+
+nsresult
+nsLookAndFeel::GetFloatImpl(FloatID aID, float &aResult)
+{
+  nsresult res = nsXPLookAndFeel::GetFloatImpl(aID, aResult);
+  if (NS_SUCCEEDED(res))
+    return res;
+  res = NS_OK;
+  
+  switch (aID) {
+    case eFloatID_IMEUnderlineRelativeSize:
+      aResult = 2.0f;
+      break;
+    case eFloatID_SpellCheckerUnderlineRelativeSize:
+      aResult = 2.0f;
+      break;
+    default:
+      aResult = -1.0;
+      res = NS_ERROR_FAILURE;
+  }
+
+  return res;
+}
+
+bool nsLookAndFeel::UseOverlayScrollbars()
+{
+  return GetInt(eIntID_UseOverlayScrollbars) != 0;
+}
+
+bool nsLookAndFeel::SystemWantsOverlayScrollbars()
+{
+  return ([NSScroller respondsToSelector:@selector(preferredScrollerStyle)] &&
+          [NSScroller preferredScrollerStyle] == mozNSScrollerStyleOverlay);
+}
+
+bool nsLookAndFeel::AllowOverlayScrollbarsOverlap()
+{
+  return (UseOverlayScrollbars() && nsCocoaFeatures::OnMountainLionOrLater());
+}
+
+// copied from gfxQuartzFontCache.mm, maybe should go in a Cocoa utils
+// file somewhere
+static void GetStringForNSString(const NSString *aSrc, nsAString& aDest)
+{
+    aDest.SetLength([aSrc length]);
+    [aSrc getCharacters:reinterpret_cast<unichar*>(aDest.BeginWriting())];
+}
+
+bool
+nsLookAndFeel::GetFontImpl(FontID aID, nsString &aFontName,
+                           gfxFontStyle &aFontStyle,
+                           float aDevPixPerCSSPixel)
+{
+    NS_OBJC_BEGIN_TRY_ABORT_BLOCK_RETURN;
+
+    // hack for now
+    if (aID == eFont_Window || aID == eFont_Document) {
+        aFontStyle.style      = NS_FONT_STYLE_NORMAL;
+        aFontStyle.weight     = NS_FONT_WEIGHT_NORMAL;
+        aFontStyle.stretch    = NS_FONT_STRETCH_NORMAL;
+        aFontStyle.size       = 14 * aDevPixPerCSSPixel;
+        aFontStyle.systemFont = true;
+
+        aFontName.AssignLiteral("sans-serif");
+        return true;
+    }
+
+/* possibilities, see NSFont Class Reference:
+    [NSFont boldSystemFontOfSize:     0.0]
+    [NSFont controlContentFontOfSize: 0.0]
+    [NSFont labelFontOfSize:          0.0]
+    [NSFont menuBarFontOfSize:        0.0]
+    [NSFont menuFontOfSize:           0.0]
+    [NSFont messageFontOfSize:        0.0]
+    [NSFont paletteFontOfSize:        0.0]
+    [NSFont systemFontOfSize:         0.0]
+    [NSFont titleBarFontOfSize:       0.0]
+    [NSFont toolTipsFontOfSize:       0.0]
+    [NSFont userFixedPitchFontOfSize: 0.0]
+    [NSFont userFontOfSize:           0.0]
+    [NSFont systemFontOfSize:         [NSFont smallSystemFontSize]]
+    [NSFont boldSystemFontOfSize:     [NSFont smallSystemFontSize]]
+*/
+
+    NSFont *font = nullptr;
+    switch (aID) {
+        // css2
+        case eFont_Caption:
+            font = [NSFont systemFontOfSize:0.0];
+            break;
+        case eFont_Icon: // used in urlbar; tried labelFont, but too small
+            font = [NSFont controlContentFontOfSize:0.0];
+            break;
+        case eFont_Menu:
+            font = [NSFont systemFontOfSize:0.0];
+            break;
+        case eFont_MessageBox:
+            font = [NSFont systemFontOfSize:[NSFont smallSystemFontSize]];
+            break;
+        case eFont_SmallCaption:
+            font = [NSFont boldSystemFontOfSize:[NSFont smallSystemFontSize]];
+            break;
+        case eFont_StatusBar:
+            font = [NSFont systemFontOfSize:[NSFont smallSystemFontSize]];
+            break;
+        // css3
+        //case eFont_Window:     = 'sans-serif'
+        //case eFont_Document:   = 'sans-serif'
+        case eFont_Workspace:
+            font = [NSFont controlContentFontOfSize:0.0];
+            break;
+        case eFont_Desktop:
+            font = [NSFont controlContentFontOfSize:0.0];
+            break;
+        case eFont_Info:
+            font = [NSFont controlContentFontOfSize:0.0];
+            break;
+        case eFont_Dialog:
+            font = [NSFont systemFontOfSize:0.0];
+            break;
+        case eFont_Button:
+            font = [NSFont systemFontOfSize:[NSFont smallSystemFontSize]];
+            break;
+        case eFont_PullDownMenu:
+            font = [NSFont menuBarFontOfSize:0.0];
+            break;
+        case eFont_List:
+            font = [NSFont systemFontOfSize:[NSFont smallSystemFontSize]];
+            break;
+        case eFont_Field:
+            font = [NSFont systemFontOfSize:[NSFont smallSystemFontSize]];
+            break;
+        // moz
+        case eFont_Tooltips:
+            font = [NSFont toolTipsFontOfSize:0.0];
+            break;
+        case eFont_Widget:
+            font = [NSFont systemFontOfSize:[NSFont smallSystemFontSize]];
+            break;
+        default:
+            break;
+    }
+
+    if (!font) {
+        NS_WARNING("failed to find a system font!");
+        return false;
+    }
+
+    NSFontSymbolicTraits traits = [[font fontDescriptor] symbolicTraits];
+    aFontStyle.style =
+        (traits & NSFontItalicTrait) ?  NS_FONT_STYLE_ITALIC : NS_FONT_STYLE_NORMAL;
+    aFontStyle.weight =
+        (traits & NSFontBoldTrait) ? NS_FONT_WEIGHT_BOLD : NS_FONT_WEIGHT_NORMAL;
+    aFontStyle.stretch =
+        (traits & NSFontExpandedTrait) ?
+            NS_FONT_STRETCH_EXPANDED : (traits & NSFontCondensedTrait) ?
+                NS_FONT_STRETCH_CONDENSED : NS_FONT_STRETCH_NORMAL;
+    // convert size from css pixels to device pixels
+    aFontStyle.size = [font pointSize] * aDevPixPerCSSPixel;
+    aFontStyle.systemFont = true;
+
+    GetStringForNSString([font familyName], aFontName);
+    return true;
+
+    NS_OBJC_END_TRY_ABORT_BLOCK_RETURN(false);
+}