a better technique for clearing the ends of the panel on wide screens

Instead of having the panel draw over the background, do the
arithmetic to clear only the end regions needed. Fixes #3.

src/border.c

@@ -387,6 +387,33 @@ VOID DrawBorder(PLAYERp pp, short x, short y, short x2, short y2)
         }
     }    
 
+VOID DrawPanelBorderSides(PLAYERp pp, short x, short y, short x2, short y2, short panl, short panr)
+    {
+    short i,j,k,l;
+    short count = 0;
+
+    for (i = 0; i < xdim; i += tilesizx[BORDER_TILE])
+        {
+        for (j = 0; j < ydim; j += tilesizy[BORDER_TILE])
+            {
+            k = i + tilesizx[BORDER_TILE];
+            l = j + tilesizy[BORDER_TILE];
+
+            if (RectOverlap(i, j, k, l, x, y, panl, y2))
+                {
+                pSpawnFullScreenSpriteBox(pp, ID_PANEL_BORDER_LEFT, BORDER_TILE, PRI_BACK, i, j, x, y, panl, y2);
+                count++;
+                }
+
+            if (RectOverlap(i, j, k, l, panr, y, x2, y2))
+                {
+                pSpawnFullScreenSpriteBox(pp, ID_PANEL_BORDER_RIGHT, BORDER_TILE, PRI_BACK, i, j, panr, y, x2, y2);
+                count++;
+                }
+            }
+        }
+    }
+
 static 
 VOID BorderSetView(PLAYERp UNUSED(pp), int *Xdim, int *Ydim, int *ScreenSize)
     {
@@ -450,32 +477,29 @@ BorderRefresh(PLAYERp pp)
     // the whole screen
     // minus the border if necessary
 
-    // set full window size - account for panel size
-    x = 0;
-    y = 0;
-    x2 = xdim;
-    y2 = ydim;
-
-    // fill in the sides of the status bar
-    if (gs.BorderNum == BORDER_BAR)
+    // fill in the sides of the panel when the screen is wide
+    if (gs.BorderNum >= BORDER_BAR && widescreen)
         {
-        y = ydim - b->Ydim - 1;
-
-        pKillScreenSpiteIDs(pp, ID_BORDER_SHADE);
-
-        DrawBorder(pp, x, y, x2, y2);
-        return;
+        int sidew = (xdim - scale(320, ydim, mulscale16(200, pixelaspect))) / 2;
+
+        x = 0;
+        x2 = xdim - 1;
+
+        y = ydim - (Y_TO_FIXED(b->Ydim) >> 16);
+        y2 = ydim - 1;
+
+        DrawPanelBorderSides(pp, x, y, x2, y2, sidew, xdim-sidew);
         }
-
+        
     // only need a border if border is > BORDER_BAR
     if (gs.BorderNum > BORDER_BAR)
         {
         // make sure that these values dont go out of bound - which they do
-        x = max(x, 0);
-        x2 = min(x2, xdim - 1);
+        x = 0;
+        x2 = xdim - 1;
 
-        y = max(y, 0);
-        y2 = min(y2, ydim - 1);
+        y = 0;
+        y2 = ydim - (Y_TO_FIXED(b->Ydim) >> 16) - 1;
 
         DrawBorder(pp, x, y, x2, y2);