Refrain from making unnecessary resize X request

The window resizing code in InitDrawingSizes is suppressed when no
change is needed. Similarly, changing piece bitmaps is suppressed when
we stay in the same variant (and InitDrawingSizes is called e.g. because
of chaging lineGap through the Board dialog).

diff --git a/xboard.c b/xboard.c
index a0fa9b6..26adc76 100644 (file)
--- a/xboard.c
+++ b/xboard.c
@@ -1682,9 +1682,17 @@ void InitDrawingSizes(BoardSize boardSize, int flags)
     Arg args[16];
     XtGeometryResult gres;
     int i;
+    static Dimension oldWidth, oldHeight;
+    static VariantClass oldVariant;
+    static int oldDual = -1;
 
     if(!formWidget) return;
 
+    if(appData.overrideLineGap >= 0) lineGap = appData.overrideLineGap;
+    boardWidth = lineGap + BOARD_WIDTH * (squareSize + lineGap);
+    boardHeight = lineGap + BOARD_HEIGHT * (squareSize + lineGap);
+
+  if(boardWidth != oldWidth || boardHeight != oldHeight || oldDual != twoBoards) { // do resizing stuff only if size actually changed
     /*
      * Enable shell resizing.
      */
@@ -1699,9 +1707,7 @@ void InitDrawingSizes(BoardSize boardSize, int flags)
     XtSetArg(args[0], XtNdefaultDistance, &sep);
     XtGetValues(formWidget, args, 1);
 
-    if(appData.overrideLineGap >= 0) lineGap = appData.overrideLineGap;
-    boardWidth = lineGap + BOARD_WIDTH * (squareSize + lineGap);
-    boardHeight = lineGap + BOARD_HEIGHT * (squareSize + lineGap);
+    oldWidth = boardWidth; oldHeight = boardHeight; oldDual = twoBoards;
     CreateGrid();
     hOffset = boardWidth + 10;
     for(i=0; i<BOARD_WIDTH+BOARD_HEIGHT+2; i++) { // [HGM] dual: grid for second board
@@ -1752,9 +1758,13 @@ void InitDrawingSizes(BoardSize boardSize, int flags)
     shellArgs[4].value = shellArgs[2].value = w;
     shellArgs[5].value = shellArgs[3].value = h;
     XtSetValues(shellWidget, &shellArgs[0], 6);
+  }
 
     // [HGM] pieces: tailor piece bitmaps to needs of specific variant
     // (only for xpm)
+
+    if(gameInfo.variant == oldVariant) return; // and only if variant changed
+
     if(useImages) {
       for(i=0; i<4; i++) {
        int p;