Bug 936628: Add media query to check for whether we have a color picker backend available. r=jimm

content/base/src/nsGkAtomList.h

@@ -2001,6 +2001,7 @@ GK_ATOM(DisplayPort, "_displayport")
 GK_ATOM(CriticalDisplayPort, "_critical_displayport")
 
 // Names for system metrics
+GK_ATOM(color_picker_available, "color-picker-available")
 GK_ATOM(scrollbar_start_backward, "scrollbar-start-backward")
 GK_ATOM(scrollbar_start_forward, "scrollbar-start-forward")
 GK_ATOM(scrollbar_end_backward, "scrollbar-end-backward")
@@ -2038,6 +2039,7 @@ GK_ATOM(windows_version_win7, "windows-version-win7")
 GK_ATOM(windows_version_win8, "windows-version-win8")
 
 // And the same again, as media query keywords.
+GK_ATOM(_moz_color_picker_available, "-moz-color-picker-available")
 GK_ATOM(_moz_scrollbar_start_backward, "-moz-scrollbar-start-backward")
 GK_ATOM(_moz_scrollbar_start_forward, "-moz-scrollbar-start-forward")
 GK_ATOM(_moz_scrollbar_end_backward, "-moz-scrollbar-end-backward")

layout/style/nsCSSRuleProcessor.cpp

@@ -1168,6 +1168,11 @@ InitSystemMetrics()
     sSystemMetrics->AppendElement(nsGkAtoms::windows_glass);
   }
 
+  rv = LookAndFeel::GetInt(LookAndFeel::eIntID_ColorPickerAvailable, &metricResult);
+  if (NS_SUCCEEDED(rv) && metricResult) {
+    sSystemMetrics->AppendElement(nsGkAtoms::color_picker_available);
+  }
+
   rv = LookAndFeel::GetInt(LookAndFeel::eIntID_WindowsClassic, &metricResult);
   if (NS_SUCCEEDED(rv) && metricResult) {
     sSystemMetrics->AppendElement(nsGkAtoms::windows_classic);

layout/style/nsMediaFeatures.cpp

@@ -495,6 +495,13 @@ nsMediaFeatures::features[] = {
         { nullptr },
         GetIsResourceDocument
     },
+    {
+        &nsGkAtoms::_moz_color_picker_available,
+        nsMediaFeature::eMinMaxNotAllowed,
+        nsMediaFeature::eBoolInteger,
+        { &nsGkAtoms::color_picker_available },
+        GetSystemMetric
+    },
     {
         &nsGkAtoms::_moz_scrollbar_start_backward,
         nsMediaFeature::eMinMaxNotAllowed,

widget/LookAndFeel.h

@@ -356,6 +356,15 @@ public:
      */
     eIntID_SwipeAnimationEnabled,
 
+    /*
+     * A Boolean value to determine whether we have a color picker available
+     * for <input type="color"> to hook into.
+     *
+     * This lets us selectively enable the style for <input type="color">
+     * based on whether it's functional or not.
+     */
+    eIntID_ColorPickerAvailable,
+
     /*
      * A boolean value indicating whether or not the device has a hardware
      * home button. Used on gaia to determine whether a home button

widget/cocoa/nsLookAndFeel.mm

@@ -446,6 +446,9 @@ nsLookAndFeel::GetIntImpl(IntID aID, int32_t &aResult)
         aResult = [NSEvent isSwipeTrackingFromScrollEventsEnabled] ? 1 : 0;
       }
       break;
+    case eIntID_ColorPickerAvailable:
+      aResult = 1;
+      break;
     default:
       aResult = 0;
       res = NS_ERROR_FAILURE;

widget/gtk/nsLookAndFeel.cpp

@@ -663,6 +663,9 @@ nsLookAndFeel::GetIntImpl(IntID aID, int32_t &aResult)
     case eIntID_SwipeAnimationEnabled:
         aResult = 0;
         break;
+    case eIntID_ColorPickerAvailable:
+        aResult = 1;
+        break;
     default:
         aResult = 0;
         res     = NS_ERROR_FAILURE;

widget/windows/nsLookAndFeel.cpp

@@ -482,6 +482,10 @@ nsLookAndFeel::GetIntImpl(IntID aID, int32_t &aResult)
     case eIntID_SwipeAnimationEnabled:
         aResult = 0;
         break;
+    case eIntID_ColorPickerAvailable:
+        // We don't have a color picker implemented on Metro yet (bug 895464)
+        aResult = (XRE_GetWindowsEnvironment() != WindowsEnvironmentType_Metro);
+        break;
     case eIntID_UseOverlayScrollbars:
         aResult = (XRE_GetWindowsEnvironment() == WindowsEnvironmentType_Metro);
         break;