Implement Xdbe-based double-buffering

2 files changed, 13 insertions, 39 deletions

diff --git a/config.mk b/config.mk
index 082a295..4f273cd 100644
--- a/config.mk
+++ b/config.mk
@@ -12,7 +12,7 @@ X11LIB = /usr/X11R6/lib
 
 # includes and libs
 INCS = -I. -I/usr/include -I${X11INC}
-LIBS = -L/usr/lib -lc -L${X11LIB} -lX11 -lutil
+LIBS = -L/usr/lib -lc -L${X11LIB} -lX11 -lutil -lXext
 
 # flags
 CPPFLAGS = -DVERSION=\"${VERSION}\"
diff --git a/st.c b/st.c
index 4dc1c5a..0e82eaf 100644
--- a/st.c
+++ b/st.c
@@ -24,6 +24,7 @@
 #include <X11/Xutil.h>
 #include <X11/cursorfont.h>
 #include <X11/keysym.h>
+#include <X11/extensions/Xdbe.h>
 
 #if   defined(__linux)
  #include <pty.h>
@@ -178,7 +179,7 @@ typedef struct {
         Display* dpy;
         Colormap cmap;
         Window win;
-        Pixmap buf;
+        XdbeBackBuffer buf;
         Atom xembed;
         XIM xim;
         XIC xic;
@@ -270,7 +271,7 @@ static void ttywrite(const char *, size_t);
 static void xdraws(char *, Glyph, int, int, int, int);
 static void xhints(void);
 static void xclear(int, int, int, int);
-static void xcopy(int, int, int, int);
+static void xcopy();
 static void xdrawcursor(void);
 static void xinit(void);
 static void xloadcols(void);
@@ -1620,32 +1621,8 @@ 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.dpy, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dpy, xw.scr));
-        XCopyArea(xw.dpy, xw.buf, newbuf, dc.gc, 0, 0, xw.bufw, xw.bufh, 0, 0);
-        XFreePixmap(xw.dpy, xw.buf);
-        XSetForeground(xw.dpy, dc.gc, dc.col[DefaultBG]);
-        if(xw.bufw > oldw)
-                XFillRectangle(xw.dpy, newbuf, dc.gc, oldw, 0,
-                                xw.bufw-oldw, MIN(xw.bufh, oldh));
-        else if(xw.bufw < oldw && (BORDER > 0 || xw.w > xw.bufw))
-                XClearArea(xw.dpy, xw.win, BORDER+xw.bufw, BORDER,
-                                xw.w-xw.bufh-BORDER, BORDER+MIN(xw.bufh, oldh),
-                                False);
-        if(xw.bufh > oldh)
-                XFillRectangle(xw.dpy, newbuf, dc.gc, 0, oldh,
-                                xw.bufw, xw.bufh-oldh);
-        else if(xw.bufh < oldh && (BORDER > 0 || xw.h > xw.bufh))
-                XClearArea(xw.dpy, xw.win, BORDER, BORDER+xw.bufh,
-                                xw.w-2*BORDER, xw.h-xw.bufh-BORDER,
-                                False);
-        xw.buf = newbuf;
 }
 
 void
@@ -1801,7 +1778,7 @@ xinit(void) {
                         CWBackPixel | CWBorderPixel | CWBitGravity | CWEventMask
                         | CWColormap,
                         &attrs);
-        xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dpy, xw.scr));
+        xw.buf = XdbeAllocateBackBufferName(xw.dpy, xw.win, XdbeCopied);
 
 
         /* input methods */
@@ -1871,10 +1848,10 @@ xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
 
 /* copy buffer pixmap to screen pixmap */
 void
-xcopy(int x, int y, int cols, int rows) {
-        int src_x = x*xw.cw, src_y = y*xw.ch, src_w = cols*xw.cw, src_h = rows*xw.ch;
-        int dst_x = BORDER+src_x, dst_y = BORDER+src_y;
-        XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, src_x, src_y, src_w, src_h, dst_x, dst_y);
+xcopy() {
+        XdbeSwapInfo swpinfo[1] = {{xw.win, XdbeCopied}};
+        XdbeSwapBuffers(xw.dpy, swpinfo, 1);
+
 }
 
 void
@@ -1918,6 +1895,7 @@ xdrawcursor(void) {
 void
 draw() {
         drawregion(0, 0, term.col, term.row);
+        xcopy();
         gettimeofday(&xw.lastdraw, NULL);
 }
 
@@ -1959,7 +1937,6 @@ drawregion(int x1, int y1, int x2, int y2) {
                 }
                 if(ib > 0)
                         xdraws(buf, base, ox, y, ic, ib);
-                xcopy(0, y, term.col, 1);
         }
         xdrawcursor();
 }
@@ -1968,13 +1945,10 @@ void
 expose(XEvent *ev) {
         XExposeEvent *e = &ev->xexpose;
         if(xw.state & WIN_REDRAW) {
-                if(!e->count) {
+                if(!e->count)
                         xw.state &= ~WIN_REDRAW;
-                        xcopy(0, 0, term.col, term.row);
-                }
-        } else
-                XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, e->x-BORDER, e->y-BORDER,
-                                e->width, e->height, e->x, e->y);
+        }
+        xcopy();
 }
 
 void