copy old pixmap to new on resize

[st.git] / st.c

diff --git a/st.c b/st.c
index 147a6fa..734ad0a 100644 (file)
--- a/st.c
+++ b/st.c
@@ -190,6 +190,7 @@ static void xdrawcursor(void);
 static void xinit(void);
 static void xloadcols(void);
 static void xseturgency(int);
+static void xresize(int, int);
 
 static void expose(XEvent *);
 static void visibility(XEvent *);
@@ -1257,6 +1258,28 @@ tresize(int col, int row) {
        tsetscroll(0, row-1);
 }
 
+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);
+       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
 xloadcols(void) {
        int i, r, g, b;
@@ -1615,16 +1638,13 @@ resize(XEvent *e) {
        
        xw.w = e->xconfigure.width;
        xw.h = e->xconfigure.height;
-       xw.bufw = xw.w - 2*BORDER;
-       xw.bufh = xw.h - 2*BORDER;
-       col = xw.bufw / xw.cw;
-       row = xw.bufh / xw.ch;
+       col = (xw.w - 2*BORDER) / xw.cw;
+       row = (xw.h - 2*BORDER) / xw.ch;
+       if(col == term.col && row == term.row)
+               return;
        tresize(col, row);
        ttyresize(col, row);
-       xw.bufh = MAX(1, xw.bufh);
-       xw.bufw = MAX(1, xw.bufw);
-       XFreePixmap(xw.dis, xw.buf);
-       xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
+       xresize(col, row);
 }
 
 void