X-Git-Url: http://winboard.nl/cgi-bin?a=blobdiff_plain;f=board.c;h=a0aa2fc79e54caf0b04df061c6033b7950c9b784;hb=3a75b74c7fc03b543993c90f4a9ebdea9f03b759;hp=8b266a28864a9a3eea851ac2a1a4da7a9f35dfdd;hpb=832f0f2bbec7f461722cbe070e2ccfda65670d56;p=xboard.git

diff --git a/board.c b/board.c
index 8b266a2..a0aa2fc 100644
--- a/board.c
+++ b/board.c
@@ -96,6 +96,7 @@ extern char *getenv();
 #include "common.h"
 #include "frontend.h"
 #include "backend.h"
+#include "xboard2.h"
 #include "moves.h"
 #include "board.h"
 #include "draw.h"
@@ -478,12 +479,12 @@ AnimationFrame (AnimNr anr, Pnt *frame, ChessSquare piece)
   MyRectangle updates[4];
   MyRectangle overlap;
   Pnt     pt;
-  int	     count, i;
   AnimState *anim = &anims[anr];
+  int     count, i, x, y, w, h;
 
   /* Save what we are about to draw into the new buffer */
   CopyRectangle(anr, DISP, 0,
-	    frame->x, frame->y, squareSize, squareSize,
+	    x = frame->x, y = frame->y, w = squareSize, h = squareSize,
 	    0, 0);
 
   /* Erase bits of the previous frame */
@@ -502,11 +503,17 @@ AnimationFrame (AnimNr anr, Pnt *frame, ChessSquare piece)
 		updates[i].y - anim->prevFrame.y,
 		updates[i].width, updates[i].height,
 		updates[i].x, updates[i].y);
+    /* [HGM] correct expose rectangle to encompass both overlapping squares */
+    if(x > anim->prevFrame.x) w += x - anim->prevFrame.x, x = anim->prevFrame.x;
+    else  w += anim->prevFrame.x - x;
+    if(y > anim->prevFrame.y) h += y - anim->prevFrame.y, y = anim->prevFrame.y;
+    else  h += anim->prevFrame.y - y;
   } else {
     /* Easy when no overlap */
     CopyRectangle(anr, 2, DISP,
 		  0, 0, squareSize, squareSize,
 		  anim->prevFrame.x, anim->prevFrame.y);
+    GraphExpose(currBoard, anim->prevFrame.x, anim->prevFrame.y, squareSize, squareSize);
   }
 
   /* Save this frame for next time round */
@@ -521,6 +528,7 @@ AnimationFrame (AnimNr anr, Pnt *frame, ChessSquare piece)
   CopyRectangle(anr, 0, DISP,
 		0, 0, squareSize, squareSize,
 		frame->x, frame->y);
+  GraphExpose(currBoard, x, y, w, h);
 }
 
 static void