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Render only once in each main loop iteration

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draw() runs over all lines of the screen and renders only the dirty lines,
this avoids render lines which are not modified since last draw() call. In
this moment the main loop is something like:

     - Wait something to read from file descriptors
     - Read from pseudo tty
     - Call draw() for rending
     - Read X events

This cause the problem that all the X events that have to update the screen
have to call draw() (because draw() is called before of X events handling),
so you can have multiples renderings in only one iteration, that will waste
a lot of resources.

This patch change the main loop to:

     - Wait something to read from file descriptors
     - Read from pseudo tty
     - Read X events
     - Call draw() for rending

So X events don't have to worry about rendering, because draw() is called
after them.

The only place where draw is called outside of the main loop is in redraw(),
but it is necessary for getting a good tput flash.
---
 st.c |   29 ++++++-----------------------
 1 file changed, 6 insertions(+), 23 deletions(-)
This commit is contained in:
Roberto E. Vargas Caballero 2012-09-16 10:48:38 +02:00
parent 85849ce72a
commit c5a9b799d4
1 changed files with 6 additions and 23 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

29
st.c
View file

@ -288,7 +288,6 @@ 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(void);
static void xdrawcursor(void);
static void xinit(void);
static void xloadcols(void);
@ -635,7 +634,6 @@ void selclear(XEvent *e) {
return;
sel.bx = -1;
tsetdirt(sel.b.y, sel.e.y);
draw();
}
void
@ -685,8 +683,6 @@ xsetsel(char *str) {
clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
XFlush(xw.dpy);
}
void
@ -729,7 +725,6 @@ brelease(XEvent *e) {
}
memcpy(&sel.tclick2, &sel.tclick1, sizeof(struct timeval));
gettimeofday(&sel.tclick1, NULL);
draw();
}
void
@ -746,7 +741,6 @@ bmotion(XEvent *e) {
int starty = MIN(oldey, sel.ey);
int endy = MAX(oldey, sel.ey);
tsetdirt(starty, endy);
draw();
}
}
}
@ -2091,13 +2085,6 @@ xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
XDrawLine(xw.dpy, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
}
/* copy buffer pixmap to screen pixmap */
void
xcopy() {
XdbeSwapInfo swpinfo[1] = {{xw.win, XdbeCopied}};
XdbeSwapBuffers(xw.dpy, swpinfo, 1);
}
void
xdrawcursor(void) {
static int oldx = 0;
@ -2118,8 +2105,6 @@ xdrawcursor(void) {
} else
xclear(oldx, oldy, oldx, oldy);
xcopy();
/* draw the new one */
if(!(term.c.state & CURSOR_HIDE)) {
if(!(xw.state & WIN_FOCUSED))
@ -2132,8 +2117,6 @@ xdrawcursor(void) {
xdraws(g.c, g, term.c.x, term.c.y, 1, sl);
oldx = term.c.x, oldy = term.c.y;
}
xcopy();
}
void
@ -2152,8 +2135,10 @@ redraw(void) {
void
draw() {
XdbeSwapInfo swpinfo[1] = {{xw.win, XdbeCopied}};
drawregion(0, 0, term.col, term.row);
xcopy();
XdbeSwapBuffers(xw.dpy, swpinfo, 1);
}
void
@ -2208,7 +2193,6 @@ expose(XEvent *ev) {
if(!e->count)
xw.state &= ~WIN_REDRAW;
}
xcopy();
}
void
@ -2241,7 +2225,6 @@ focus(XEvent *ev) {
xseturgency(0);
} else
xw.state &= ~WIN_FOCUSED;
draw();
}
char*
@ -2317,7 +2300,6 @@ cmessage(XEvent *e) {
} else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
xw.state &= ~WIN_FOCUSED;
}
draw();
}
}
@ -2358,8 +2340,6 @@ run(void) {
if(FD_ISSET(cmdfd, &rfd))
ttyread();
draw();
while(XPending(xw.dpy)) {
XNextEvent(xw.dpy, &ev);
if(XFilterEvent(&ev, xw.win))
@ -2367,6 +2347,9 @@ run(void) {
if(handler[ev.type])
(handler[ev.type])(&ev);
}
draw();
XFlush(xw.dpy);
}
}