Add a few test pattern lines

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%403354

test/testlines2.c

@@ -63,12 +63,19 @@ DrawLines(SDL_WindowID window)
         SDL_SetRenderDrawColor(255, (Uint8) current_color,
                                (Uint8) current_color, (Uint8) current_alpha);
 
+        if (i == 0) {
+            SDL_RenderLine(0, 0, window_w, window_h);
+            SDL_RenderLine(0, window_h, window_w, 0);
+            SDL_RenderLine(0, window_h/2, window_w, window_h/2);
+            SDL_RenderLine(window_w/2, 0, window_w/2, window_h);
+        } else {
             x1 = rand() % window_w;
             x2 = rand() % window_w;
             y1 = rand() % window_h;
             y2 = rand() % window_h;
             SDL_RenderLine(x1, y1, x2, y2);
         }
+    }
     SDL_SetRenderDrawBlendMode(SDL_BLENDMODE_NONE);
 
     /* Update the screen! */