Bug 1024930 - Change text highlighting color. r=roc

layout/generic/nsTextFrame.cpp

@@ -3643,6 +3643,14 @@ nsTextPaintStyle::InitSelectionColorsAndShadow()
                                                      eCSSProperty_color;
       nscoord frameColor = mFrame->GetVisitedDependentColor(property);
       mSelectionTextColor = EnsureDifferentColors(frameColor, mSelectionBGColor);
+    } else if (mSelectionTextColor == NS_CHANGE_COLOR_IF_SAME_AS_BG) {
+      nsCSSProperty property = mFrame->IsSVGText() ? eCSSProperty_fill :
+                                                     eCSSProperty_color;
+      nscolor frameColor = mFrame->GetVisitedDependentColor(property);
+      if (frameColor == mSelectionBGColor) {
+        mSelectionTextColor =
+          LookAndFeel::GetColor(LookAndFeel::eColorID_TextSelectForegroundCustom);
+      }
     } else {
       EnsureSufficientContrast(&mSelectionTextColor, &mSelectionBGColor);
     }

widget/LookAndFeel.h

@@ -39,6 +39,7 @@ public:
     eColorID_TextForeground,
     eColorID_TextSelectBackground,
     eColorID_TextSelectForeground,
+    eColorID_TextSelectForegroundCustom,
     eColorID_TextSelectBackgroundDisabled,
     eColorID_TextSelectBackgroundAttention,
     eColorID_TextHighlightBackground,
@@ -588,6 +589,12 @@ public:
 // Of course if other plaforms work like the Mac, they can use it too.
 #define NS_DONT_CHANGE_COLOR 	NS_RGB(0x01, 0x01, 0x01)
 
+// Similar with NS_DONT_CHANGE_COLOR, except NS_DONT_CHANGE_COLOR would returns
+// complementary color if fg color is same as bg color.
+// NS_CHANGE_COLOR_IF_SAME_AS_BG would returns eColorID_TextSelectForegroundCustom if
+// fg and bg color are the same.
+#define NS_CHANGE_COLOR_IF_SAME_AS_BG NS_RGB(0x02, 0x02, 0x02)
+
 // ---------------------------------------------------------------------
 //  Special colors for eColorID_IME* and eColorID_SpellCheckerUnderline
 // ---------------------------------------------------------------------

widget/gonk/nsLookAndFeel.cpp

@@ -92,12 +92,19 @@ nsLookAndFeel::NativeGetColor(ColorID aID, nscolor &aColor)
         aColor = TEXT_NORMAL_COLOR;
         break;
     case eColorID_TextSelectBackground:
+        aColor = NS_RGBA(0x33,0xb5,0xe5,0x66);
+        break;
     case eColorID_IMESelectedRawTextBackground:
     case eColorID_IMESelectedConvertedTextBackground:
         // still used
         aColor = BASE_SELECTED_COLOR;
         break;
+    case eColorID_TextSelectForegroundCustom:
+        aColor = NS_RGB(0x4d,0x4d,0x4d);
+        break;
     case eColorID_TextSelectForeground:
+        aColor = NS_CHANGE_COLOR_IF_SAME_AS_BG;
+        break;
     case eColorID_IMESelectedRawTextForeground:
     case eColorID_IMESelectedConvertedTextForeground:
         // still used

widget/xpwidgets/nsXPLookAndFeel.cpp

@@ -151,6 +151,7 @@ const char nsXPLookAndFeel::sColorPrefs[][38] =
   "ui.textForeground",
   "ui.textSelectBackground",
   "ui.textSelectForeground",
+  "ui.textSelectForegroundCustom",
   "ui.textSelectBackgroundDisabled",
   "ui.textSelectBackgroundAttention",
   "ui.textHighlightBackground",