Fix a problem when bg_color == fg_color

Invert the intensity bit if the background_color == foreground_color

googletest/src/gtest.cc

@@ -2979,16 +2979,37 @@ void ColoredPrintf(GTestColor color, const char* fmt, ...) {
   CONSOLE_SCREEN_BUFFER_INFO buffer_info;
   GetConsoleScreenBufferInfo(stdout_handle, &buffer_info);
   const WORD old_color_attrs = buffer_info.wAttributes;
+ 
   // Let's reuse the BG
-  const WORD background_mask = BACKGROUND_BLUE | BACKGROUND_GREEN | BACKGROUND_RED | BACKGROUND_INTENSITY;   
+  const WORD background_mask = BACKGROUND_BLUE | BACKGROUND_GREEN | BACKGROUND_RED | BACKGROUND_INTENSITY;
+  const WORD foreground_mask = FOREGROUND_BLUE | FOREGROUND_GREEN | FOREGROUND_RED | FOREGROUND_INTENSITY;
+
   const WORD existing_bg = old_color_attrs & background_mask;
+
+  WORD new_color = GetColorAttribute(color) | existing_bg | FOREGROUND_INTENSITY;
+
+#if 1 // do we really need to waste these cpu cycles every time?
+  int bg_bitOffset = 0;
+  WORD bg_mask = background_mask;
+  while((bg_mask & 0x01) == 0x00) {
+	  bg_mask >>= 1;
+	  ++bg_bitOffset;
+  }
+#else
+  const int bg_bitOffset = 4;
+#endif
   
+  if (((new_color & background_mask) >> bg_bitOffset) == (new_color & foreground_mask)) {
+	  //revert intensity
+	  new_color ^= FOREGROUND_INTENSITY;
+  }
+
   // We need to flush the stream buffers into the console before each
   // SetConsoleTextAttribute call lest it affect the text that is already
   // printed but has not yet reached the console.
   fflush(stdout);
-  SetConsoleTextAttribute(stdout_handle,
-                          GetColorAttribute(color) | existing_bg | FOREGROUND_INTENSITY);
+  SetConsoleTextAttribute(stdout_handle, new_color);
+
   vprintf(fmt, args);
 
   fflush(stdout);