Avoid loading system fonts in LayoutThemeMac::systemFont

third_party/WebKit/Source/core/layout/LayoutThemeMac.mm

 /*
  * Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Google, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 158 matching lines @@
         return oldAquaFocusRingColor;
 
     return systemColor(CSSValueWebkitFocusRingColor);
 }
 
 Color LayoutThemeMac::platformInactiveListBoxSelectionBackgroundColor() const
 {
     return platformInactiveSelectionBackgroundColor();
 }
 
-static FontWeight toFontWeight(NSInteger appKitFontWeight)
-{
-    ASSERT(appKitFontWeight > 0 && appKitFontWeight < 15);
-    if (appKitFontWeight > 14)
-        appKitFontWeight = 14;
-    else if (appKitFontWeight < 1)
-        appKitFontWeight = 1;
-
-    static FontWeight fontWeights[] = {
-        FontWeight100,
-        FontWeight100,
-        FontWeight200,
-        FontWeight300,
-        FontWeight400,
-        FontWeight500,
-        FontWeight600,
-        FontWeight600,
-        FontWeight700,
-        FontWeight800,
-        FontWeight800,
-        FontWeight900,
-        FontWeight900,
-        FontWeight900
-    };
-    return fontWeights[appKitFontWeight - 1];
-}
-
-static inline NSFont* systemNSFont(CSSValueID systemFontID)
+static inline CGFloat systemNSFontSize(CSSValueID systemFontID)
 {
     switch (systemFontID) {
     case CSSValueSmallCaption:
-        return [NSFont systemFontOfSize:[NSFont smallSystemFontSize]];
+        return [NSFont smallSystemFontSize];
     case CSSValueMenu:
-        return [NSFont menuFontOfSize:[NSFont systemFontSize]];
+        return [NSFont systemFontSize];
     case CSSValueStatusBar:
-        return [NSFont labelFontOfSize:[NSFont labelFontSize]];
+        return [NSFont labelFontSize];
     case CSSValueWebkitMiniControl:
-        return [NSFont systemFontOfSize:[NSFont systemFontSizeForControlSize:NSMiniControlSize]];
+        return [NSFont systemFontSizeForControlSize:NSMiniControlSize];
     case CSSValueWebkitSmallControl:
-        return [NSFont systemFontOfSize:[NSFont systemFontSizeForControlSize:NSSmallControlSize]];
+        return [NSFont systemFontSizeForControlSize:NSSmallControlSize];
     case CSSValueWebkitControl:
-        return [NSFont systemFontOfSize:[NSFont systemFontSizeForControlSize:NSRegularControlSize]];
+        return [NSFont systemFontSizeForControlSize:NSRegularControlSize];
     default:
-        return [NSFont systemFontOfSize:[NSFont systemFontSize]];
+        return [NSFont systemFontSize];
     }
 }
 
 void LayoutThemeMac::systemFont(CSSValueID systemFontID, FontStyle& fontStyle, FontWeight& fontWeight, float& fontSize, AtomicString& fontFamily) const
 {
-    NSFont* font = systemNSFont(systemFontID);
-    if (!font)
-        return;
-
-    NSFontManager *fontManager = [NSFontManager sharedFontManager];
-    fontStyle = ([fontManager traitsOfFont:font] & NSItalicFontMask) ? FontStyleItalic : FontStyleNormal;
-    fontWeight = toFontWeight([fontManager weightOfFont:font]);
-    fontSize = [font pointSize];
+    fontStyle = FontStyleNormal;
+    fontWeight = FontWeightNormal;
+    fontSize = systemNSFontSize(systemFontID);
     fontFamily = @"BlinkMacSystemFont";
 }
 
 bool LayoutThemeMac::needsHackForTextControlWithFontFamily(const AtomicString& family) const
 {
     // This hack is only applied on OSX 10.9.
     // https://code.google.com/p/chromium/issues/detail?id=515989#c8
     return IsOSMavericks() && family == "BlinkMacSystemFont";
 }
 
@@ skipping 348 matching lines @@
     if (style.height().isAuto() && size.height() > 0)
         style.setHeight(Length(size.height(), Fixed));
 }
 
 void LayoutThemeMac::setFontFromControlSize(ComputedStyle& style, NSControlSize controlSize) const
 {
     FontDescription fontDescription;
     fontDescription.setIsAbsoluteSize(true);
     fontDescription.setGenericFamily(FontDescription::SerifFamily);
 
-    NSFont* font = [NSFont systemFontOfSize:[NSFont systemFontSizeForControlSize:controlSize]];
+    CGFloat pointSize = [NSFont systemFontSizeForControlSize:controlSize];
     fontDescription.firstFamily().setFamily(@"BlinkMacSystemFont");
-    fontDescription.setComputedSize([font pointSize] * style.effectiveZoom());
-    fontDescription.setSpecifiedSize([font pointSize] * style.effectiveZoom());
+    fontDescription.setComputedSize(pointSize * style.effectiveZoom());
+    fontDescription.setSpecifiedSize(pointSize * style.effectiveZoom());
 
     // Reset line height.
     style.setLineHeight(ComputedStyle::initialLineHeight());
 
     // TODO(esprehn): The fontSelector manual management is buggy and error prone.
     FontSelector* fontSelector = style.font().getFontSelector();
     if (style.setFontDescription(fontDescription))
         style.font().update(fontSelector);
 }
 
@@ skipping 459 matching lines @@
 
 bool LayoutThemeMac::shouldUseFallbackTheme(const ComputedStyle& style) const
 {
     ControlPart part = style.appearance();
     if (part == CheckboxPart || part == RadioPart)
         return style.effectiveZoom() != 1;
     return false;
 }
 
 } // namespace blink