Added primary input devices setting to blink to allow media queries for hover/pointer

Source/WebCore/css/MediaQueryEvaluator.cpp

 /*
  * CSS Media Query Evaluator
  *
  * Copyright (C) 2006 Kimmo Kinnunen <kimmo.t.kinnunen@nokia.com>.
  * Copyright (C) 2013 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
@@ skipping 679 matching lines @@
         break;
     default:
         result = false;
         break;
     }
 
     return result;
 }
 #endif // ENABLE(VIEW_MODE_CSS_MEDIA)
 
-enum PointerDeviceType { TouchPointer, MousePointer, NoPointer, UnknownPointer };
-
-static PointerDeviceType leastCapablePrimaryPointerDeviceType(Frame* frame)
-{
-    if (frame->settings()->deviceSupportsTouch())
-        return TouchPointer;
-
-    // FIXME: We should also try to determine if we know we have a mouse.
-    // When we do this, we'll also need to differentiate between known not to
-    // have mouse or touch screen (NoPointer) and unknown (UnknownPointer).
-    // We could also take into account other preferences like accessibility
-    // settings to decide which of the available pointers should be considered
-    // "primary".
-
-    return UnknownPointer;
-}
-
 static bool hoverMediaFeatureEval(CSSValue* value, RenderStyle*, Frame* frame, MediaFeaturePrefix)
 {
-    PointerDeviceType pointer = leastCapablePrimaryPointerDeviceType(frame);
+    int pointer = frame->settings()->primaryPointerDevices();
 
     // If we're on a port that hasn't explicitly opted into providing pointer device information
     // (or otherwise can't be confident in the pointer hardware available), then behave exactly
     // as if this feature feature isn't supported.
-    if (pointer == UnknownPointer)
+    if (pointer == PointerDeviceUnknown)
         return false;
 
     float number = 1;
     if (value) {
         if (!numberValue(value, number))
             return false;
     }
 
-    return (pointer == NoPointer && !number)
-        || (pointer == TouchPointer && !number)
-        || (pointer == MousePointer && number == 1);
+    if (pointer & (PointerDeviceTouch | PointerDeviceNone))
+      return !number;
+    else if (pointer & PointerDeviceMouse)
+      return number == 1;
+    else
+      return false;
 }
 
 static bool pointerMediaFeatureEval(CSSValue* value, RenderStyle*, Frame* frame, MediaFeaturePrefix)
 {
-    PointerDeviceType pointer = leastCapablePrimaryPointerDeviceType(frame);
+    int pointer = frame->settings()->primaryPointerDevices();
 
     // If we're on a port that hasn't explicitly opted into providing pointer device information
     // (or otherwise can't be confident in the pointer hardware available), then behave exactly
     // as if this feature feature isn't supported.
-    if (pointer == UnknownPointer)
+    if (pointer == PointerDeviceUnknown)
         return false;
 
     if (!value)
-        return pointer != NoPointer;
+        return !(pointer & PointerDeviceNone);
 
     if (!value->isPrimitiveValue())
         return false;
 
     const int id = static_cast<CSSPrimitiveValue*>(value)->getIdent();
-    return (pointer == NoPointer && id == CSSValueNone)
-        || (pointer == TouchPointer && id == CSSValueCoarse)
-        || (pointer == MousePointer && id == CSSValueFine);
+
+    if (pointer & PointerDeviceNone)
+      return id == CSSValueNone;
+    else if (pointer & PointerDeviceTouch)
+      return id == CSSValueCoarse;
+    else if (pointer & PointerDeviceMouse)
+      return id == CSSValueFine;
+    else
+      return false;
 }
 
 static void createFunctionMap()
 {
     // Create the table.
     gFunctionMap = new FunctionMap;
 #define ADD_TO_FUNCTIONMAP(name, str)  \
     gFunctionMap->set(name##MediaFeature.impl(), name##MediaFeatureEval);
     CSS_MEDIAQUERY_NAMES_FOR_EACH_MEDIAFEATURE(ADD_TO_FUNCTIONMAP);
 #undef ADD_TO_FUNCTIONMAP
@@ skipping 14 matching lines @@
     // and let trampoline functions override the prefix if prefix is
     // used
     EvalFunc func = gFunctionMap->get(expr->mediaFeature().impl());
     if (func)
         return func(expr->value(), m_style.get(), m_frame, NoPrefix);
 
     return false;
 }
 
 } // namespace