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fastcompmgr.c
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/*
* fastcompmgr - a _fast_ compositor for X11
*
* based on xcompmgr - copyright (c) 2003, keith packard
* 2008, Dana Jansens
* compton 2011, Christopher Jeffrey
* fastcompmgr 2023, Tycho Kirchner
*
* copyright (c) 2023, Tycho Kirchner
* See LICENSE for more information.
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <limits.h>
#include <math.h>
#include <sys/poll.h>
#include <sys/time.h>
#include <time.h>
#include <unistd.h>
#include <getopt.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xatom.h>
#include <X11/extensions/Xcomposite.h>
#include <X11/extensions/Xdamage.h>
#include <X11/extensions/Xrender.h>
#include "cm-global.h"
#include "cm-root.h"
#include "comp_rect.h"
#include "ringbuffer.h"
#define likely(x) __builtin_expect(!!(x), 1)
#define unlikely(x) __builtin_expect(!!(x), 0)
#if COMPOSITE_MAJOR > 0 || COMPOSITE_MINOR >= 2
#define HAS_NAME_WINDOW_PIXMAP 1
#endif
#define CAN_DO_USABLE 0
typedef enum {
WINTYPE_UNKNOWN, // MUST ALWAYS STAY first, due to init optimization in add_win
WINTYPE_DESKTOP,
WINTYPE_DOCK,
WINTYPE_TOOLBAR,
WINTYPE_MENU,
WINTYPE_UTILITY,
WINTYPE_SPLASH,
WINTYPE_DIALOG,
WINTYPE_NORMAL,
WINTYPE_DROPDOWN_MENU,
WINTYPE_POPUP_MENU,
WINTYPE_TOOLTIP,
WINTYPE_NOTIFY,
WINTYPE_COMBO,
WINTYPE_DND,
NUM_WINTYPES
} wintype;
// Cache whether to draw a shadow or not
typedef enum {
SHADOW_UNKNWON, // MUST ALWAYS STAY first, due to init optimization in add_win
SHADOW_YES,
SHADOW_NO
} shadowtype;
typedef struct _ignore {
struct _ignore *next;
unsigned long sequence;
} ignore;
typedef struct _win {
struct _win *next;
Window id;
#if HAS_NAME_WINDOW_PIXMAP
Pixmap pixmap;
#endif
XWindowAttributes a;
#if CAN_DO_USABLE
Bool usable; /* mapped and all damaged at one point */
XRectangle damage_bounds; /* bounds of damage */
#endif
int mode;
int damaged;
Damage damage;
Picture picture;
Picture alpha_pict;
Picture alpha_border_pict;
Picture shadow_pict;
XserverRegion border_size;
XserverRegion extents;
Picture shadow;
int shadow_dx;
int shadow_dy;
int shadow_width;
int shadow_height;
unsigned int opacity;
wintype window_type;
shadowtype shadow_type;
unsigned long damage_sequence; /* sequence when damage was created */
Bool destroyed;
Bool paint_needed;
unsigned int left_width;
unsigned int right_width;
unsigned int top_width;
unsigned int bottom_width;
Bool need_configure;
bool configure_size_changed;
XConfigureEvent queue_configure;
/* for drawing translucent windows */
XserverRegion border_clip;
struct _win *prev_trans;
} win;
typedef struct _conv {
int size;
double *data;
} conv;
typedef struct _fade {
struct _fade *next;
win *w;
double cur;
double finish;
double step;
void (*callback) (Display *dpy, win *w);
Display *dpy;
} fade;
win *list;
fade *fades;
Display *dpy;
Picture black_picture;
Picture root_tile;
XserverRegion all_damage;
XserverRegion g_xregion_tmp;
Bool all_damage_is_dirty;
Bool clip_changed;
#if HAS_NAME_WINDOW_PIXMAP
Bool has_name_pixmap;
#endif
ringBuffer_typedef(ulong, IgnoreErrRingbuf);
IgnoreErrRingbuf ignore_ringbuf;
IgnoreErrRingbuf* p_ignore_ringbuf = &ignore_ringbuf;
int xfixes_event, xfixes_error;
int damage_event, damage_error;
int composite_event, composite_error;
int render_event, render_error;
Bool synchronize;
int composite_opcode;
static Bool g_paint_ignore_region_is_dirty = True;
Atom win_type[NUM_WINTYPES];
double win_type_opacity[NUM_WINTYPES];
Bool win_type_shadow[NUM_WINTYPES];
Bool win_type_fade[NUM_WINTYPES];
#define REGISTER_PROP "_NET_WM_CM_S"
#define OPAQUE 0xffffffff
conv *gaussian_map;
#define WINDOW_SOLID 0
#define WINDOW_TRANS 1
#define WINDOW_ARGB 2
#ifndef DEBUG_REPAINT
#define DEBUG_REPAINT 0
#endif
#ifndef DEBUG_EVENTS
#define DEBUG_EVENTS 0
#endif
#define MONITOR_REPAINT 0
static void
determine_mode(Display *dpy, win *w);
static bool
is_gtk_frame_extent(Display *dpy, Window w);
static double
get_opacity_percent(Display *dpy, win *w);
static void
do_configure_win(Display *dpy, win* w);
static void
set_paint_ignore_region_dirty(void);
static XserverRegion
win_extents(Display *dpy, win *w);
int shadow_radius = 12;
int shadow_offset_x = -15;
int shadow_offset_y = -15;
double shadow_opacity = .75;
double fade_in_step = 0.028;
double fade_out_step = 0.03;
int fade_delta = 10;
int fade_time = 0;
Bool fade_trans = False;
double inactive_opacity = 0;
double frame_opacity = 0;
#define INACTIVE_OPACITY \
(unsigned long)((double)inactive_opacity * OPAQUE)
#define IS_NORMAL_WIN(w) \
((w) && ((w)->window_type == WINTYPE_NORMAL \
|| (w)->window_type == WINTYPE_UTILITY))
#define HAS_FRAME_OPACITY(w) (frame_opacity && (w)->top_width)
/* For shadow precomputation */
int Gsize = -1;
unsigned char *shadow_corner = NULL;
unsigned char *shadow_top = NULL;
int
get_time_in_milliseconds() {
struct timeval tv;
gettimeofday(&tv, NULL);
return tv.tv_sec * 1000 + tv.tv_usec / 1000;
}
fade *
find_fade(win *w) {
fade *f;
for (f = fades; f; f = f->next) {
if (f->w == w) return f;
}
return 0;
}
void
dequeue_fade(Display *dpy, fade *f) {
fade **prev;
for (prev = &fades; *prev; prev = &(*prev)->next) {
if (*prev == f) {
*prev = f->next;
if (f->callback) {
(*f->callback)(dpy, f->w);
}
free(f);
break;
}
}
}
void
cleanup_fade(Display *dpy, win *w) {
fade *f = find_fade (w);
if (f) {
dequeue_fade(dpy, f);
}
}
void
enqueue_fade(Display *dpy, fade *f) {
if (!fades) {
fade_time = get_time_in_milliseconds() + fade_delta;
}
f->next = fades;
fades = f;
}
static void
set_fade(Display *dpy, win *w, double start,
double finish, double step,
void(*callback) (Display *dpy, win *w),
Bool exec_callback, Bool override) {
fade *f;
f = find_fade(w);
if (!f) {
f = malloc(sizeof(fade));
f->next = 0;
f->w = w;
f->cur = start;
enqueue_fade(dpy, f);
} else if (!override) {
return;
} else {
if (exec_callback && f->callback) {
(*f->callback)(dpy, f->w);
}
}
if (finish < 0) finish = 0;
if (finish > 1) finish = 1;
f->finish = finish;
if (f->cur < finish) {
f->step = step;
} else if (f->cur > finish) {
f->step = -step;
}
f->callback = callback;
w->opacity = f->cur * OPAQUE;
#if 0
printf("set_fade start %g step %g\n", f->cur, f->step);
#endif
determine_mode(dpy, w);
if (w->shadow) {
// rebuild the shadow
XRenderFreePicture(dpy, w->shadow);
w->shadow = None;
win_extents(dpy, w);
}
/* fading windows need to be drawn, mark
them as damaged. when a window maps,
if it tries to fade in but it already
at the right opacity (map/unmap/map fast)
then it will never get drawn without this
until it repaints */
w->damaged = 1;
}
int
fade_timeout(void) {
int now;
int delta;
if (!fades) return -1;
now = get_time_in_milliseconds();
delta = fade_time - now;
if (delta < 0) delta = 0;
/* printf("timeout %d\n", delta); */
return delta;
}
void
run_fades(Display *dpy) {
int now = get_time_in_milliseconds();
fade *next = fades;
int steps;
Bool need_dequeue;
#if 0
printf("run fades\n");
#endif
if (fade_time - now > 0) return;
steps = 1 + (now - fade_time) / fade_delta;
while (next) {
fade *f = next;
win *w = f->w;
next = f->next;
f->cur += f->step * steps;
if (f->cur >= 1) {
f->cur = 1;
} else if (f->cur < 0) {
f->cur = 0;
}
#if 0
printf("opacity now %g\n", f->cur);
#endif
w->opacity = f->cur * OPAQUE;
need_dequeue = False;
if (f->step > 0) {
if (f->cur >= f->finish) {
w->opacity = f->finish * OPAQUE;
need_dequeue = True;
}
} else {
if (f->cur <= f->finish) {
w->opacity = f->finish * OPAQUE;
need_dequeue = True;
}
}
determine_mode(dpy, w);
if (w->shadow) {
// rebuild the shadow
XRenderFreePicture(dpy, w->shadow);
w->shadow = None;
win_extents(dpy, w);
}
/* Must do this last as it might
destroy f->w in callbacks */
if (need_dequeue) dequeue_fade(dpy, f);
}
fade_time = now + fade_delta;
}
static double
gaussian(double r, double x, double y) {
return ((1 / (sqrt(2 * M_PI * r))) *
exp((- (x * x + y * y)) / (2 * r * r)));
}
static conv *
make_gaussian_map(Display *dpy, double r) {
conv *c;
int size = ((int) ceil((r * 3)) + 1) & ~1;
int center = size / 2;
int x, y;
double t;
double g;
c = malloc(sizeof(conv) + size * size * sizeof(double));
c->size = size;
c->data = (double *) (c + 1);
t = 0.0;
for (y = 0; y < size; y++) {
for (x = 0; x < size; x++) {
g = gaussian(r, (double) (x - center), (double) (y - center));
t += g;
c->data[y * size + x] = g;
}
}
/* printf("gaussian total %f\n", t); */
for (y = 0; y < size; y++) {
for (x = 0; x < size; x++) {
c->data[y * size + x] /= t;
}
}
return c;
}
/*
* A picture will help
*
* -center 0 width width+center
* -center +-----+-------------------+-----+
* | | | |
* | | | |
* 0 +-----+-------------------+-----+
* | | | |
* | | | |
* | | | |
* height +-----+-------------------+-----+
* | | | |
* height+ | | | |
* center +-----+-------------------+-----+
*/
static unsigned char
sum_gaussian(conv *map, double opacity,
int x, int y, int width, int height) {
int fx, fy;
double *g_data;
double *g_line = map->data;
int g_size = map->size;
int center = g_size / 2;
int fx_start, fx_end;
int fy_start, fy_end;
double v;
/*
* Compute set of filter values which are "in range",
* that's the set with:
* 0 <= x + (fx-center) && x + (fx-center) < width &&
* 0 <= y + (fy-center) && y + (fy-center) < height
*
* 0 <= x + (fx - center) x + fx - center < width
* center - x <= fx fx < width + center - x
*/
fx_start = center - x;
if (fx_start < 0) fx_start = 0;
fx_end = width + center - x;
if (fx_end > g_size) fx_end = g_size;
fy_start = center - y;
if (fy_start < 0) fy_start = 0;
fy_end = height + center - y;
if (fy_end > g_size) fy_end = g_size;
g_line = g_line + fy_start * g_size + fx_start;
v = 0;
for (fy = fy_start; fy < fy_end; fy++) {
g_data = g_line;
g_line += g_size;
for (fx = fx_start; fx < fx_end; fx++) {
v += *g_data++;
}
}
if (v > 1) v = 1;
return ((unsigned char) (v * opacity * 255.0));
}
/* precompute shadow corners and sides
to save time for large windows */
static void
presum_gaussian(conv *map) {
int center = map->size/2;
int opacity, x, y;
Gsize = map->size;
if (shadow_corner) free((void *)shadow_corner);
if (shadow_top) free((void *)shadow_top);
shadow_corner = (unsigned char *)(malloc((Gsize + 1) * (Gsize + 1) * 26));
shadow_top = (unsigned char *)(malloc((Gsize + 1) * 26));
for (x = 0; x <= Gsize; x++) {
shadow_top[25 * (Gsize + 1) + x] =
sum_gaussian(map, 1, x - center, center, Gsize * 2, Gsize * 2);
for (opacity = 0; opacity < 25; opacity++) {
shadow_top[opacity * (Gsize + 1) + x] =
shadow_top[25 * (Gsize + 1) + x] * opacity / 25;
}
for (y = 0; y <= x; y++) {
shadow_corner[25 * (Gsize + 1) * (Gsize + 1) + y * (Gsize + 1) + x]
= sum_gaussian(map, 1, x - center, y - center, Gsize * 2, Gsize * 2);
shadow_corner[25 * (Gsize + 1) * (Gsize + 1) + x * (Gsize + 1) + y]
= shadow_corner[25 * (Gsize + 1) * (Gsize + 1) + y * (Gsize + 1) + x];
for (opacity = 0; opacity < 25; opacity++) {
shadow_corner[opacity * (Gsize + 1) * (Gsize + 1)
+ y * (Gsize + 1) + x]
= shadow_corner[opacity * (Gsize + 1) * (Gsize + 1)
+ x * (Gsize + 1) + y]
= shadow_corner[25 * (Gsize + 1) * (Gsize + 1)
+ y * (Gsize + 1) + x] * opacity / 25;
}
}
}
}
static XImage *
make_shadow(Display *dpy, double opacity,
int width, int height) {
XImage *ximage;
unsigned char *data;
int gsize = gaussian_map->size;
int ylimit, xlimit;
int swidth = width + gsize;
int sheight = height + gsize;
int center = gsize / 2;
int x, y;
unsigned char d;
int x_diff;
int opacity_int = (int)(opacity * 25);
data = malloc(swidth * sheight * sizeof(unsigned char));
if (!data) return 0;
ximage = XCreateImage(
dpy, DefaultVisual(dpy, DefaultScreen(dpy)), 8,
ZPixmap, 0, (char *) data, swidth, sheight, 8,
swidth * sizeof(unsigned char));
if (!ximage) {
free(data);
return 0;
}
/*
* Build the gaussian in sections
*/
/*
* center (fill the complete data array)
*/
if (Gsize > 0) {
d = shadow_top[opacity_int * (Gsize + 1) + Gsize];
} else {
d = sum_gaussian(gaussian_map,
opacity, center, center, width, height);
}
memset(data, d, sheight * swidth);
/*
* corners
*/
ylimit = gsize;
if (ylimit > sheight / 2) ylimit = (sheight + 1) / 2;
xlimit = gsize;
if (xlimit > swidth / 2) xlimit = (swidth + 1) / 2;
for (y = 0; y < ylimit; y++)
for (x = 0; x < xlimit; x++) {
if (xlimit == Gsize && ylimit == Gsize) {
d = shadow_corner[opacity_int * (Gsize + 1) * (Gsize + 1)
+ y * (Gsize + 1) + x];
} else {
d = sum_gaussian(gaussian_map,
opacity, x - center, y - center, width, height);
}
data[y * swidth + x] = d;
data[(sheight - y - 1) * swidth + x] = d;
data[(sheight - y - 1) * swidth + (swidth - x - 1)] = d;
data[y * swidth + (swidth - x - 1)] = d;
}
/*
* top/bottom
*/
x_diff = swidth - (gsize * 2);
if (x_diff > 0 && ylimit > 0) {
for (y = 0; y < ylimit; y++) {
if (ylimit == Gsize) {
d = shadow_top[opacity_int * (Gsize + 1) + y];
} else {
d = sum_gaussian(gaussian_map,
opacity, center, y - center, width, height);
}
memset(&data[y * swidth + gsize], d, x_diff);
memset(&data[(sheight - y - 1) * swidth + gsize], d, x_diff);
}
}
/*
* sides
*/
for (x = 0; x < xlimit; x++) {
if (xlimit == Gsize) {
d = shadow_top[opacity_int * (Gsize + 1) + x];
} else {
d = sum_gaussian(gaussian_map,
opacity, x - center, center, width, height);
}
for (y = gsize; y < sheight - gsize; y++) {
data[y * swidth + x] = d;
data[y * swidth + (swidth - x - 1)] = d;
}
}
return ximage;
}
static Picture
shadow_picture(Display *dpy, double opacity, Picture alpha_pict,
int width, int height, int *wp, int *hp) {
XImage *shadowImage;
Pixmap shadowPixmap;
Picture shadow_picture;
GC gc;
shadowImage = make_shadow(dpy, opacity, width, height);
if (!shadowImage) return None;
shadowPixmap = XCreatePixmap(dpy, root,
shadowImage->width, shadowImage->height, 8);
if (!shadowPixmap) {
XDestroyImage(shadowImage);
return None;
}
shadow_picture = XRenderCreatePicture(dpy, shadowPixmap,
XRenderFindStandardFormat(dpy, PictStandardA8), 0, 0);
if (!shadow_picture) {
XDestroyImage(shadowImage);
XFreePixmap(dpy, shadowPixmap);
return None;
}
gc = XCreateGC(dpy, shadowPixmap, 0, 0);
if (!gc) {
XDestroyImage(shadowImage);
XFreePixmap(dpy, shadowPixmap);
XRenderFreePicture(dpy, shadow_picture);
return None;
}
XPutImage(
dpy, shadowPixmap, gc, shadowImage, 0, 0, 0, 0,
shadowImage->width, shadowImage->height);
*wp = shadowImage->width;
*hp = shadowImage->height;
XFreeGC(dpy, gc);
XDestroyImage(shadowImage);
XFreePixmap(dpy, shadowPixmap);
return shadow_picture;
}
Picture
solid_picture(Display *dpy, Bool argb, double a,
double r, double g, double b) {
Pixmap pixmap;
Picture picture;
XRenderPictureAttributes pa;
XRenderColor c;
pixmap = XCreatePixmap(dpy, root, 1, 1, argb ? 32 : 8);
if (!pixmap) return None;
pa.repeat = True;
picture = XRenderCreatePicture(dpy, pixmap,
XRenderFindStandardFormat(dpy, argb
? PictStandardARGB32 : PictStandardA8),
CPRepeat,
&pa);
if (!picture) {
XFreePixmap(dpy, pixmap);
return None;
}
c.alpha = a * 0xffff;
c.red = r * 0xffff;
c.green = g * 0xffff;
c.blue = b * 0xffff;
XRenderFillRectangle(dpy, PictOpSrc, picture, &c, 0, 0, 1, 1);
XFreePixmap(dpy, pixmap);
return picture;
}
void
discard_ignore(Display *dpy, unsigned long sequence) {
while(! isBufferEmpty(p_ignore_ringbuf)){
ulong buf_seq;
buf_seq = bufferReadPeek(p_ignore_ringbuf);
if ((long) (sequence - buf_seq) > 0) {
bufferReadSkip(p_ignore_ringbuf);
} else {
break;
}
}
}
void
set_ignore(Display *dpy, unsigned long sequence) {
if(unlikely(isBufferFull(p_ignore_ringbuf))) {
bufferIncrease(p_ignore_ringbuf, p_ignore_ringbuf->size*2);
}
bufferWrite(p_ignore_ringbuf, sequence);
}
int
should_ignore(Display *dpy, unsigned long sequence) {
ulong buf_seq;
discard_ignore(dpy, sequence);
if(isBufferEmpty(p_ignore_ringbuf)) return False;
buf_seq = bufferReadPeek(p_ignore_ringbuf);
return buf_seq == sequence;
}
static win *
find_win(Display *dpy, Window id) {
win *w;
for (w = list; w; w = w->next) {
if (w->id == id && !w->destroyed)
return w;
}
return 0;
}
static void
paint_root(Display *dpy) {
if (!root_tile) {
root_tile = root_create_tile();
}
XRenderComposite(
dpy, PictOpSrc, root_tile, None,
root_buffer, 0, 0, 0, 0, 0, 0,
root_width, root_height);
}
static XserverRegion
win_extents(Display *dpy, win *w) {
XRectangle r;
r.x = w->a.x;
r.y = w->a.y;
r.width = w->a.width + w->a.border_width * 2;
r.height = w->a.height + w->a.border_width * 2;
if(unlikely(w->shadow_type)==SHADOW_UNKNWON){
// override_redirect: looking at xlib's documentation for the "Override Redirect Flag", it becomes
// clear that toolkits will typically set this flag for popup windows.
// On the other hand, WINTYPE_NORMAL windows setting override_redirect, are likely
// some kind of special windows, as seen in zoom screenshare. At least in zoom's case,
// the shadow darkens the whole desktop. A better fix might be to render
// four shadow images around the window instead of one huge shadow. But first
// check, why dcompmgr does not have this problem.
// See also: https://github.com/regolith-linux/regolith-compositor-compton-glx/issues/3
w->shadow_type = (likely(w->window_type)
&& win_type_shadow[w->window_type] &&
(! w->a.override_redirect || w->window_type != WINTYPE_NORMAL) &&
! is_gtk_frame_extent(dpy, w->id)) ? SHADOW_YES : SHADOW_NO;
}
if (w->shadow_type == SHADOW_YES) {
XRectangle sr;
w->shadow_dx = shadow_offset_x;
w->shadow_dy = shadow_offset_y;
if (!w->shadow) {
double opacity = shadow_opacity;
if (w->mode != WINDOW_SOLID) {
opacity = opacity * ((double)w->opacity) / ((double)OPAQUE);
}
if (HAS_FRAME_OPACITY(w)) {
opacity = opacity * frame_opacity;
}
w->shadow = shadow_picture(
dpy, opacity, w->alpha_pict,
w->a.width + w->a.border_width * 2,
w->a.height + w->a.border_width * 2,
&w->shadow_width, &w->shadow_height);
}
sr.x = w->a.x + w->shadow_dx;
sr.y = w->a.y + w->shadow_dy;
sr.width = w->shadow_width;
sr.height = w->shadow_height;
if (sr.x < r.x) {
r.width = (r.x + r.width) - sr.x;
r.x = sr.x;
}
if (sr.y < r.y) {
r.height = (r.y + r.height) - sr.y;
r.y = sr.y;
}
if (sr.x + sr.width > r.x + r.width) {
r.width = sr.x + sr.width - r.x;
}
if (sr.y + sr.height > r.y + r.height) {
r.height = sr.y + sr.height - r.y;
}
}
if(! w->extents){
w->extents = XFixesCreateRegion(dpy, &r, 1);
} else {
XFixesSetRegion(dpy, w->extents, &r, 1);
}
return w->extents;
}
static XserverRegion
border_size(Display *dpy, win *w) {
XserverRegion border;
/*
* if window doesn't exist anymore, this will generate an error
* as well as not generate a region. Perhaps a better XFixes
* architecture would be to have a request that copies instead
* of creates, that way you'd just end up with an empty region
* instead of an invalid XID.
*/
set_ignore(dpy, NextRequest(dpy));
border = XFixesCreateRegionFromWindow(
dpy, w->id, WindowRegionBounding);
/* translate this */
set_ignore(dpy, NextRequest(dpy));
XFixesTranslateRegion(dpy, border,
w->a.x + w->a.border_width,
w->a.y + w->a.border_width);
return border;
}
static Window
find_client_win(Display *dpy, Window win) {
Window root, parent;
Window *children;
unsigned int nchildren;
unsigned int i;
Atom type = None;
int format;
unsigned long nitems, after;
unsigned char *data = NULL;
Window client = 0;
int res;
res = XGetWindowProperty(
dpy, win, atom_wm_state, 0, 0, False,
AnyPropertyType, &type, &format, &nitems,
&after, &data);
if (likely(res == Success && data != NULL )) {
XFree(data);
if (likely(type)) return win;
}
if (!XQueryTree(dpy, win, &root,
&parent, &children, &nchildren)) {
return 0;
}
for (i = 0; i < nchildren; i++) {
client = find_client_win(dpy, children[i]);
if (client) break;
}
if (children) XFree((char *)children);
return client;
}
static void
get_frame_extents(Display *dpy, Window w,
unsigned int *left,
unsigned int *right,
unsigned int *top,
unsigned int *bottom) {
long *extents;
Atom type;
int format;
unsigned long nitems, after;
unsigned char *data = NULL;
int result;
*left = 0;
*right = 0;
*top = 0;
*bottom = 0;
w = find_client_win(dpy, w);
if (!w) return;
result = XGetWindowProperty(
dpy, w, atom_net_frame_extents,
0L, 4L, False, AnyPropertyType,
&type, &format, &nitems, &after,
(unsigned char **)&data);
if (result == Success) {
if (nitems == 4 && after == 0) {
extents = (long *)data;
*left =
(unsigned int)extents[0];
*right =
(unsigned int)extents[1];
*top =
(unsigned int)extents[2];
*bottom =
(unsigned int)extents[3];
}
XFree(data);
}
}
static Bool
win_paint_needed(win* w, CompRect* ignore_reg){
// if invisible, ignore it
if (unlikely(w->a.x + w->a.width < 1 || w->a.y + w->a.height < 1
|| w->a.x >= root_width || w->a.y >= root_height)) {
return False;