copy old pixmap to new on resize

1 files changed, 15 insertions, 1 deletions

diff --git a/st.c b/st.c
index 594b0d3..734ad0a 100644
--- a/st.c
+++ b/st.c
@@ -1260,10 +1260,24 @@ tresize(int col, int row) {
 
 void
 xresize(int col, int row) {
+        Pixmap newbuf;
+        int oldw, oldh;
+
+        oldw = xw.bufw;
+        oldh = xw.bufh;
         xw.bufw = MAX(1, col * xw.cw);
         xw.bufh = MAX(1, row * xw.ch);
+        newbuf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
+        XCopyArea(xw.dis, xw.buf, newbuf, dc.gc, 0, 0, xw.bufw, xw.bufh, 0, 0);
         XFreePixmap(xw.dis, xw.buf);
-        xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
+        XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
+        if(xw.bufw > oldw)
+                XFillRectangle(xw.dis, newbuf, dc.gc, oldw, 0,
+                                xw.bufw-oldw, MIN(xw.bufh, oldh));
+        if(xw.bufh > oldh)
+                XFillRectangle(xw.dis, newbuf, dc.gc, 0, oldh,
+                                xw.bufw, xw.bufh-oldh);
+        xw.buf = newbuf;
 }
 
 void