xzoom: don't redraw the screen when the window's not visible - xzoom - A simple screen magnifier for X11.
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---
(DIR) commit 02455f8f2c282c809f8bea1a00a00b8cda11de57
(DIR) parent 2efc3a678f4a4694acb57bc368771c5be11c02f3
(HTM) Author: Phil Carmody <pc+xzoom@asdf.org>
Date: Thu, 21 Nov 2013 17:38:46 +0200
xzoom: don't redraw the screen when the window's not visible
Most of the CPU usage was in the read/scale/write part, so skip it
if we can.
Signed-off-by: Phil Carmody <pc+xzoom@asdf.org>
Signed-off-by: Christoph Lohmann <20h@r-36.net>
Diffstat:
xzoom.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
---
(DIR) diff --git a/xzoom.c b/xzoom.c
@@ -385,6 +385,7 @@ main(int argc, char **argv) {
XSizeHints *sizeh = NULL;
XClassHint *ch;
int buttonpressed = False;
+ int visible = False;
int scroll = 1;
char title[80];
XGCValues gcv;
@@ -576,6 +577,8 @@ main(int argc, char **argv) {
xswa.event_mask = ButtonPressMask|ButtonReleaseMask|ButtonMotionMask;
xswa.event_mask |= StructureNotifyMask; /* resize etc.. */
xswa.event_mask |= KeyPressMask|KeyReleaseMask; /* commands */
+ xswa.event_mask |= VisibilityChangeMask;
+
xswa.background_pixel = BlackPixelOfScreen(scr);
win = XCreateWindow(dpy, RootWindowOfScreen(scr),
@@ -699,6 +702,11 @@ main(int argc, char **argv) {
case ReparentNotify:
break; /* what do we do with it? */
+ case VisibilityNotify:
+ /* VisibilityUnobscured, VisibilityPartiallyObscured, or VisibilityFullyObscured */
+ visible = (event.xvisibility.state!=VisibilityFullyObscured);
+ break;
+
case KeyRelease:
switch(XKeycodeToKeysym(dpy, event.xkey.keycode, 0)) {
case XK_Control_L:
@@ -901,7 +909,8 @@ main(int argc, char **argv) {
}
- xzoom(buttonpressed);
+ if(visible)
+ xzoom(buttonpressed);
#ifdef NO_USLEEP
#define usleep(_t) \