ui: white color define (#23930)

selfdrive/ui/qt/onroad.cc

@@ -314,8 +314,8 @@ void NvgWindow::drawLaneLines(QPainter &painter, const UIScene &scene) {
   }
   // paint path
   QLinearGradient bg(0, height(), 0, height() / 4);
-  bg.setColorAt(0, scene.end_to_end ? redColor() : QColor(255, 255, 255));
-  bg.setColorAt(1, scene.end_to_end ? redColor(0) : QColor(255, 255, 255, 0));
+  bg.setColorAt(0, scene.end_to_end ? redColor() : whiteColor());
+  bg.setColorAt(1, scene.end_to_end ? redColor(0) : whiteColor(0));
   painter.setBrush(bg);
   painter.drawPolygon(scene.track_vertices.v, scene.track_vertices.cnt);
 }

selfdrive/ui/qt/onroad.h

@@ -76,6 +76,7 @@ protected:
   void drawLaneLines(QPainter &painter, const UIScene &scene);
   void drawLead(QPainter &painter, const cereal::ModelDataV2::LeadDataV3::Reader &lead_data, const QPointF &vd);
   inline QColor redColor(int alpha = 255) { return QColor(201, 34, 49, alpha); }
+  inline QColor whiteColor(int alpha = 255) { return QColor(255, 255, 255, alpha); }
   double prev_draw_t = 0;
 };