added check to ensure that decoration does not overlap gadget border

diff --git a/src/libgame/gadgets.c b/src/libgame/gadgets.c
index 75d0a8558970bcb8b2da5ba4f74ec5c4a25e85c2..b21ecdca09607e9afb25eb4dec7f1fb8ad302e19 100644 (file)
--- a/src/libgame/gadgets.c
+++ b/src/libgame/gadgets.c
@@ -231,15 +231,24 @@ static void DrawGadget(struct GadgetInfo *gi, boolean pressed, boolean direct)
     case GD_TYPE_NORMAL_BUTTON:
     case GD_TYPE_CHECK_BUTTON:
     case GD_TYPE_RADIO_BUTTON:
+
       BlitBitmapOnBackground(gd->bitmap, drawto,
                             gd->x, gd->y, gi->width, gi->height,
                             gi->x, gi->y);
+
       if (gi->deco.design.bitmap)
+      {
+       // make sure that decoration does not overlap gadget border
+       int deco_x = gi->deco.x + (pressed ? gi->deco.xshift : 0);
+       int deco_y = gi->deco.y + (pressed ? gi->deco.yshift : 0);
+       int deco_width  = MIN(gi->deco.width,  gi->width  - deco_x);
+       int deco_height = MIN(gi->deco.height, gi->height - deco_y);
+
        BlitBitmap(gi->deco.design.bitmap, drawto,
                   gi->deco.design.x, gi->deco.design.y,
-                  gi->deco.width, gi->deco.height,
-                  gi->x + gi->deco.x + (pressed ? gi->deco.xshift : 0),
-                  gi->y + gi->deco.y + (pressed ? gi->deco.yshift : 0));
+                  deco_width, deco_height, gi->x + deco_x, gi->y + deco_y);
+      }
+
       break;
 
     case GD_TYPE_TEXT_BUTTON: