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ewmh.c
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ewmh.c
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/*
* Copyright 2014 Olaf Seibert
*/
/*
* Implements some of the Extended Window Manager Hints, as (extremely
* poorly) documented at
* http://standards.freedesktop.org/wm-spec/wm-spec-1.3.html .
* In fact, the wiki page that refers to that as being the current version
* (http://www.freedesktop.org/wiki/Specifications/wm-spec/)
* neglects to tell us there are newer versions 1.4 and 1.5 at
* http://standards.freedesktop.org/wm-spec/wm-spec-1.5.html
* (which has a listable directory that I discovered by accident).
* The same wiki page also has lots of dead links to a CVS repository.
* Nevertheless, it is where one ends up if one starts at
* http://www.freedesktop.org/wiki/Specifications/ .
*
* EWMH is an extension to the ICCCM (Inter-Client Communication
* Conventions Manual).
* http://tronche.com/gui/x/icccm/
*
* To fill in lots of details, the source code of other window managers
* has been consulted.
*/
#include "ctwm.h"
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <stdint.h>
#include <assert.h>
#include <X11/Xatom.h>
#include <X11/extensions/shape.h>
#include "ctwm_atoms.h"
#include "ctwm_shutdown.h"
#include "ewmh_atoms.h"
#include "screen.h"
#include "events.h"
#include "event_handlers.h"
#include "functions_defs.h"
#include "icons.h"
#include "otp.h"
#include "image.h"
#include "list.h"
#include "functions.h"
#include "occupation.h"
#include "r_layout.h"
#include "util.h"
#include "vscreen.h"
#include "win_iconify.h"
#include "win_ops.h"
#include "win_resize.h"
#include "win_utils.h"
#include "workspace_utils.h"
/* #define DEBUG_EWMH */
Atom XEWMHAtom[NUM_EWMH_XATOMS];
#define NET_WM_STATE_REMOVE 0 /* remove/unset property */
#define NET_WM_STATE_ADD 1 /* add/set property */
#define NET_WM_STATE_TOGGLE 2 /* toggle property */
#define _NET_WM_MOVERESIZE_SIZE_TOPLEFT 0
#define _NET_WM_MOVERESIZE_SIZE_TOP 1
#define _NET_WM_MOVERESIZE_SIZE_TOPRIGHT 2
#define _NET_WM_MOVERESIZE_SIZE_RIGHT 3
#define _NET_WM_MOVERESIZE_SIZE_BOTTOMRIGHT 4
#define _NET_WM_MOVERESIZE_SIZE_BOTTOM 5
#define _NET_WM_MOVERESIZE_SIZE_BOTTOMLEFT 6
#define _NET_WM_MOVERESIZE_SIZE_LEFT 7
#define _NET_WM_MOVERESIZE_MOVE 8 /* movement only */
#define _NET_WM_MOVERESIZE_SIZE_KEYBOARD 9 /* size via keyboard */
#define _NET_WM_MOVERESIZE_MOVE_KEYBOARD 10 /* move via keyboard */
#define _NET_WM_MOVERESIZE_CANCEL 11 /* cancel operation */
static Image *ExtractIcon(ScreenInfo *scr, unsigned long *prop, int width,
int height);
static void EwmhClientMessage_NET_WM_DESKTOP(XClientMessageEvent *msg);
static void EwmhClientMessage_NET_WM_STATE(XClientMessageEvent *msg);
static void EwmhClientMessage_NET_ACTIVE_WINDOW(XClientMessageEvent *msg);
static void EwmhClientMessage_NET_WM_MOVERESIZE(XClientMessageEvent *msg);
static XEvent synth_btnevent_for_moveresize(TwmWindow *twm_win);
static unsigned long EwmhGetWindowProperty(Window w, Atom name, Atom type);
static void EwmhGetStrut(TwmWindow *twm_win, bool update);
static void EwmhRemoveStrut(TwmWindow *twm_win);
static void EwmhSet_NET_WORKAREA(ScreenInfo *scr);
static int EwmhGet_NET_WM_STATE(TwmWindow *twm_win);
static void EwmhClientMessage_NET_WM_STATEchange(TwmWindow *twm_win, int change,
int newVal);
#define ALL_WORKSPACES 0xFFFFFFFFU
static void SendPropertyMessage(Window to, Window about,
Atom messagetype,
long l0, long l1, long l2, long l3, long l4,
long mask)
{
XEvent e;
e.xclient.type = ClientMessage;
e.xclient.message_type = messagetype;
e.xclient.display = dpy;
e.xclient.window = about;
e.xclient.format = 32;
e.xclient.data.l[0] = l0;
e.xclient.data.l[1] = l1;
e.xclient.data.l[2] = l2;
e.xclient.data.l[3] = l3;
e.xclient.data.l[4] = l4;
XSendEvent(dpy, to, False, mask, &e);
}
static void EwmhInitAtoms(void)
{
XInternAtoms(dpy, XEWMHAtomNames, NUM_EWMH_XATOMS, False, XEWMHAtom);
}
static bool caughtError;
static int CatchError(Display *display, XErrorEvent *event)
{
caughtError = true;
return 0;
}
void EwmhInit(void)
{
EwmhInitAtoms();
}
/*
* Force-generate some event, so that we know the current time.
*
* Suggested in the ICCCM:
* http://tronche.com/gui/x/icccm/sec-2.html#s-2.1
*/
static void GenerateTimestamp(ScreenInfo *scr)
{
XEvent event;
struct timespec tosleep;
int timeout = 200; /* 0.2 seconds in ms */
int found;
/* Sleep in 10ms chunks */
tosleep.tv_sec = 0;
tosleep.tv_nsec = (10 * 1000 * 1000);
if(EventTime > 0) {
return;
}
XChangeProperty(dpy, scr->icccm_Window,
XA_WM_CLASS, XA_STRING,
8, PropModeAppend, NULL, 0);
while(timeout > 0) {
found = XCheckTypedWindowEvent(dpy, scr->icccm_Window, PropertyNotify, &event);
if(found) {
break;
}
nanosleep(&tosleep, NULL);
timeout -= 10;
}
if(found) {
#ifdef DEBUG_EWMH
fprintf(stderr, "GenerateTimestamp: time = %ld, timeout left = %d\n",
event.xproperty.time, timeout);
#endif /* DEBUG_EWMH */
if(EventTime < event.xproperty.time) {
EventTime = event.xproperty.time;
}
}
}
/*
* Perform the "replace the window manager" protocol, as vaguely hinted
* at by the ICCCM section 4.3.
* http://tronche.com/gui/x/icccm/sec-4.html#s-4.3
*
* We do want to run through this even if we're not running with
* --replace ourselves, because it also sets up the bits for other
* invocations to --replace us.
*
* TODO: convert the selection to atom VERSION.
*/
static bool EwmhReplaceWM(ScreenInfo *scr)
{
char atomname[32];
Atom wmAtom;
Window selectionOwner;
snprintf(atomname, sizeof(atomname), "WM_S%d", scr->screen);
wmAtom = XInternAtom(dpy, atomname, False);
selectionOwner = XGetSelectionOwner(dpy, wmAtom);
if(selectionOwner == scr->icccm_Window) {
selectionOwner = None;
}
if(selectionOwner != None) {
XErrorHandler oldHandler;
/*
* Check if that owner still exists, and if it does, we want
* StructureNotify-kind events from it.
*/
caughtError = false;
oldHandler = XSetErrorHandler(CatchError);
XSelectInput(dpy, selectionOwner, StructureNotifyMask);
XSync(dpy, False);
XSetErrorHandler(oldHandler);
if(caughtError) {
selectionOwner = None;
}
}
/*
* If something else is owning things and we're not running
* --replace, give up now and return failure.
*/
if(selectionOwner != None && !CLarg.ewmh_replace) {
#ifdef DEBUG_EWMH
fprintf(stderr, "A window manager is already running on screen %d\n",
scr->screen);
#endif
return false;
}
/* We're asked to --replace, so try to do so */
XSetSelectionOwner(dpy, wmAtom, scr->icccm_Window, CurrentTime);
if(XGetSelectionOwner(dpy, wmAtom) != scr->icccm_Window) {
fprintf(stderr, "Did not get window manager selection on screen %d\n",
scr->screen);
return false;
}
/*
* If there was a previous selection owner, wait for it
* to go away.
*/
if(selectionOwner != None) {
int timeout = 10 * 1000; /* 10 seconds in ms */
XEvent event;
struct timespec tosleep;
/* Sleep in 100ms chunks */
tosleep.tv_sec = 0;
tosleep.tv_nsec = (100 * 1000 * 1000);
while(timeout > 0) {
int found = XCheckTypedWindowEvent(dpy, selectionOwner, DestroyNotify, &event);
if(found) {
break;
}
nanosleep(&tosleep, NULL);
timeout -= 100;
}
if(timeout <= 0) {
fprintf(stderr, "Timed out waiting for other window manager "
"on screen %d to quit\n",
scr->screen);
return false;
}
}
/*
* Send a message to confirm we're now managing the screen.
* ICCCM, end of chapter 2, section "Manager Selections".
* http://tronche.com/gui/x/icccm/sec-2.html#s-2.8
*
* ICCCM says StructureNotifyMask,
* OpenBox says SubstructureNotifyMask.
*/
GenerateTimestamp(scr);
SendPropertyMessage(scr->XineramaRoot, scr->XineramaRoot,
XA_MANAGER, EventTime, wmAtom, scr->icccm_Window, 0, 0,
StructureNotifyMask);
return true;
}
/*
* This function is called very early in initialisation.
*
* Only scr->screen and scr->XineramaRoot are valid: we want to know if
* it makes sense to continue with the full initialisation.
*
* Create the ICCCM window that owns the WM_Sn selection.
*/
bool EwmhInitScreenEarly(ScreenInfo *scr)
{
XSetWindowAttributes attrib;
#ifdef DEBUG_EWMH
fprintf(stderr, "EwmhInitScreenEarly: XCreateWindow\n");
#endif
attrib.event_mask = PropertyChangeMask;
attrib.override_redirect = True;
scr->icccm_Window = XCreateWindow(dpy, scr->XineramaRoot,
-100, -100, 1, 1, 0,
CopyFromParent, InputOutput,
CopyFromParent,
CWEventMask | CWOverrideRedirect,
&attrib);
XMapWindow(dpy, scr->icccm_Window);
XLowerWindow(dpy, scr->icccm_Window);
#ifdef DEBUG_EWMH
fprintf(stderr, "EwmhInitScreenEarly: call EwmhReplaceWM\n");
#endif
if(!EwmhReplaceWM(scr)) {
XDestroyWindow(dpy, scr->icccm_Window);
scr->icccm_Window = None;
#ifdef DEBUG_EWMH
fprintf(stderr, "EwmhInitScreenEarly: return false\n");
#endif
return false;
}
#ifdef DEBUG_EWMH
fprintf(stderr, "EwmhInitScreenEarly: return true\n");
#endif
return true;
}
/*
* This initialisation is called late, when scr has been set up
* completely.
*/
void EwmhInitScreenLate(ScreenInfo *scr)
{
long data[2];
/* Set _NET_SUPPORTING_WM_CHECK on root window */
data[0] = scr->icccm_Window;
XChangeProperty(dpy, scr->XineramaRoot,
XA__NET_SUPPORTING_WM_CHECK, XA_WINDOW,
32, PropModeReplace,
(unsigned char *)data, 1);
/*
* Set properties on the window;
* this also belongs with _NET_SUPPORTING_WM_CHECK
*/
XChangeProperty(dpy, scr->icccm_Window,
XA__NET_WM_NAME, XA_UTF8_STRING,
8, PropModeReplace,
(unsigned char *)"ctwm", 4);
data[0] = scr->icccm_Window;
XChangeProperty(dpy, scr->icccm_Window,
XA__NET_SUPPORTING_WM_CHECK, XA_WINDOW,
32, PropModeReplace,
(unsigned char *)data, 1);
/*
* Add supported properties to the root window.
*/
data[0] = 0;
data[1] = 0;
XChangeProperty(dpy, scr->XineramaRoot,
XA__NET_DESKTOP_VIEWPORT, XA_CARDINAL,
32, PropModeReplace,
(unsigned char *)data, 2);
data[0] = scr->rootw;
data[1] = scr->rooth;
XChangeProperty(dpy, scr->XineramaRoot,
XA__NET_DESKTOP_GEOMETRY, XA_CARDINAL,
32, PropModeReplace,
(unsigned char *)data, 2);
EwmhSet_NET_WORKAREA(scr);
if(scr->workSpaceManagerActive) {
data[0] = scr->workSpaceMgr.count;
}
else {
data[0] = 1;
}
XChangeProperty(dpy, scr->XineramaRoot,
XA__NET_NUMBER_OF_DESKTOPS, XA_CARDINAL,
32, PropModeReplace,
(unsigned char *)data, 1);
if(scr->workSpaceManagerActive) {
/* TODO: this is for the first Virtual Screen only... */
/*data[0] = scr->workSpaceMgr.workSpaceWindowList->currentwspc->number; */
data[0] = 0;
}
else {
data[0] = 0;
}
XChangeProperty(dpy, scr->XineramaRoot,
XA__NET_CURRENT_DESKTOP, XA_CARDINAL,
32, PropModeReplace,
(unsigned char *)data, 1);
EwmhSet_NET_SHOWING_DESKTOP(0);
long supported[30];
int i = 0;
supported[i++] = XA__NET_SUPPORTING_WM_CHECK;
supported[i++] = XA__NET_DESKTOP_VIEWPORT;
supported[i++] = XA__NET_NUMBER_OF_DESKTOPS;
supported[i++] = XA__NET_CURRENT_DESKTOP;
supported[i++] = XA__NET_DESKTOP_GEOMETRY;
supported[i++] = XA__NET_WM_ICON;
supported[i++] = XA__NET_WM_DESKTOP;
supported[i++] = XA__NET_CLIENT_LIST;
supported[i++] = XA__NET_CLIENT_LIST_STACKING;
supported[i++] = XA__NET_WM_WINDOW_TYPE;
supported[i++] = XA__NET_WM_WINDOW_TYPE_NORMAL;
supported[i++] = XA__NET_WM_WINDOW_TYPE_DESKTOP;
supported[i++] = XA__NET_WM_WINDOW_TYPE_DOCK;
supported[i++] = XA__NET_WM_STRUT;
supported[i++] = XA__NET_WM_STRUT_PARTIAL;
supported[i++] = XA__NET_SHOWING_DESKTOP;
supported[i++] = XA__NET_WM_STATE;
supported[i++] = XA__NET_WM_STATE_MAXIMIZED_VERT;
supported[i++] = XA__NET_WM_STATE_MAXIMIZED_HORZ;
supported[i++] = XA__NET_WM_STATE_FULLSCREEN;
supported[i++] = XA__NET_ACTIVE_WINDOW;
supported[i++] = XA__NET_WORKAREA;
supported[i++] = XA__NET_WM_MOVERESIZE;
supported[i++] = XA__NET_WM_STATE_SHADED;
supported[i++] = XA__NET_WM_STATE_ABOVE;
supported[i++] = XA__NET_WM_STATE_BELOW;
XChangeProperty(dpy, scr->XineramaRoot,
XA__NET_SUPPORTED, XA_ATOM,
32, PropModeReplace,
(unsigned char *)supported, i);
}
/*
* Set up the _NET_VIRTUAL_ROOTS property, which indicates that we're
* using virtual root windows.
* This applies only if we have multiple virtual screens.
*
* Also record this as a supported atom in _NET_SUPPORTED.
*
* Really, our virtual screens (with their virtual root windows) don't quite
* fit in the EWMH idiom. Several root window properties (such as
* _NET_CURRENT_DESKTOP) are more appropriate on the virtual root windows. But
* that is not where other clients would look for them.
*
* The idea seems to be that the virtual roots as used for workspaces (desktops
* in EWMH terminology) are only mapped one at a time.
*/
void EwmhInitVirtualRoots(ScreenInfo *scr)
{
int numVscreens = scr->numVscreens;
if(numVscreens > 1) {
long *data;
long d0;
VirtualScreen *vs;
int i;
data = calloc(numVscreens, sizeof(long));
for(vs = scr->vScreenList, i = 0;
vs != NULL && i < numVscreens;
vs = vs->next, i++) {
data[i] = vs->window;
}
XChangeProperty(dpy, scr->XineramaRoot,
XA__NET_VIRTUAL_ROOTS, XA_WINDOW,
32, PropModeReplace,
(unsigned char *)data, numVscreens);
/* This might fail, but what can we do about it? */
free(data);
d0 = XA__NET_VIRTUAL_ROOTS;
XChangeProperty(dpy, scr->XineramaRoot,
XA__NET_SUPPORTED, XA_ATOM,
32, PropModeAppend,
(unsigned char *)&d0, 1);
}
}
static void EwmhTerminateScreen(ScreenInfo *scr)
{
XDeleteProperty(dpy, scr->XineramaRoot, XA__NET_SUPPORTED);
/*
* Don't delete scr->icccm_Window; let it be deleted automatically
* when we terminate the X server connection. A replacement window
* manager may want to start working immediately after it has
* disappeared.
*/
}
/*
* Clear everything that needs to be cleared before we exit.
*/
void EwmhTerminate(void)
{
int scrnum;
ScreenInfo *scr;
for(scrnum = 0; scrnum < NumScreens; scrnum++) {
if((scr = ScreenList[scrnum]) == NULL) {
continue;
}
EwmhTerminateScreen(scr);
}
}
/*
* Event handler: lost the WM_Sn selection
* (that's the only selection we have).
*/
void EwmhSelectionClear(XSelectionClearEvent *sev)
{
#ifdef DEBUG_EWMH
fprintf(stderr, "sev->window = %x\n", (unsigned)sev->window);
#endif
DoShutdown();
}
/*
* When accepting client messages to the root window,
* be accepting and accept both the real root window and the
* current virtual screen.
*
* Should perhaps also accept any other virtual screen.
*/
bool EwmhClientMessage(XClientMessageEvent *msg)
{
if(msg->format != 32) {
return false;
}
/* Messages regarding any window */
if(msg->message_type == XA__NET_WM_DESKTOP) {
EwmhClientMessage_NET_WM_DESKTOP(msg);
return true;
}
else if(msg->message_type == XA__NET_WM_STATE) {
EwmhClientMessage_NET_WM_STATE(msg);
return true;
}
else if(msg->message_type == XA__NET_ACTIVE_WINDOW) {
EwmhClientMessage_NET_ACTIVE_WINDOW(msg);
return true;
}
else if(msg->message_type == XA__NET_WM_MOVERESIZE) {
EwmhClientMessage_NET_WM_MOVERESIZE(msg);
return true;
}
/* Messages regarding the root window */
if(msg->window != Scr->XineramaRoot &&
msg->window != Scr->Root) {
#ifdef DEBUG_EWMH
fprintf(stderr, "Received unrecognized client message: %s\n",
XGetAtomName(dpy, msg->message_type));
#endif
return false;
}
if(msg->message_type == XA__NET_CURRENT_DESKTOP) {
GotoWorkSpaceByNumber(Scr->currentvs, msg->data.l[0]);
return true;
}
else if(msg->message_type == XA__NET_SHOWING_DESKTOP) {
ShowBackground(Scr->currentvs, msg->data.l[0] ? 1 : 0);
}
else {
#ifdef DEBUG_EWMH
fprintf(stderr, "Received unrecognized client message about root window: %s\n",
XGetAtomName(dpy, msg->message_type));
#endif
}
return false;
}
/*
* The format of the _NET_WM_ICON property is
*
* [0] width
* [1] height
* height repetitions of
* row, which is
* width repetitions of
* pixel: ARGB
* repeat for next size.
*
* Some icons can be 256x256 CARDINALs which is 65536 CARDINALS!
* Therefore we fetch in pieces and skip the pixels of large icons
* until needed.
*
* First scan all sizes. Keep a record of the closest smaller and larger
* size. At the end, choose from one of those.
* Finally, go and fetch the pixel data.
*/
Image *EwmhGetIcon(ScreenInfo *scr, TwmWindow *twm_win)
{
int fetch_offset;
Atom actual_type;
int actual_format;
unsigned long nitems, bytes_after;
unsigned long *prop;
int wanted_area;
int smaller, larger;
int offset;
int smaller_offset, larger_offset;
int i;
int area, width, height;
fetch_offset = 0;
if(XGetWindowProperty(dpy, twm_win->w, XA__NET_WM_ICON,
fetch_offset, 8 * 1024, False, XA_CARDINAL,
&actual_type, &actual_format, &nitems,
&bytes_after, (unsigned char **)&prop) != Success || nitems == 0) {
return NULL;
}
if(actual_format != 32) {
XFree(prop);
return NULL;
}
#ifdef DEBUG_EWMH
fprintf(stderr, "_NET_WM_ICON data fetched\n");
#endif
/*
* Usually the icons are square, but that is not a rule.
* So we measure the area instead.
*
* Approach wanted size from both directions and at the end,
* choose the "nearest".
*/
wanted_area = Scr->PreferredIconWidth * Scr->PreferredIconHeight;
smaller = 0;
larger = 999999;
offset = 0;
smaller_offset = -1;
larger_offset = -1;
i = 0;
for(;;) {
offset = i;
int w = prop[i++];
int h = prop[i++];
int size = w * h;
area = w * h;
#ifdef DEBUG_EWMH
fprintf(stderr, "[%d+%d] w=%d h=%d\n", fetch_offset, offset, w, h);
#endif
if(area == wanted_area) {
#ifdef DEBUG_EWMH
fprintf(stderr, "exact match [%d+%d=%d] w=%d h=%d\n", fetch_offset, offset,
fetch_offset + offset, w, h);
#endif /* DEBUG_EWMH */
smaller_offset = fetch_offset + offset;
smaller = area;
larger_offset = -1;
break;
}
else if(area < wanted_area) {
if(area > smaller) {
#ifdef DEBUG_EWMH
fprintf(stderr, "increase smaller, was [%d]\n", smaller_offset);
#endif /* DEBUG_EWMH */
smaller = area;
smaller_offset = fetch_offset + offset;
}
}
else { /* area > wanted_area */
if(area < larger) {
#ifdef DEBUG_EWMH
fprintf(stderr, "decrease larger, was [%d]\n", larger_offset);
#endif /* DEBUG_EWMH */
larger = area;
larger_offset = fetch_offset + offset;
}
}
if(i + size + 2 > nitems) {
#ifdef DEBUG_EWMH
fprintf(stderr, "not enough data: %d + %d > %ld \n", i, size, nitems);
#endif /* DEBUG_EWMH */
if(i + size + 2 <= nitems + bytes_after / 4) {
/* we can fetch some more... */
XFree(prop);
fetch_offset += i + size;
if(XGetWindowProperty(dpy, twm_win->w, XA__NET_WM_ICON,
fetch_offset, 8 * 1024, False, XA_CARDINAL,
&actual_type, &actual_format, &nitems,
&bytes_after, (unsigned char **)&prop) != Success) {
continue;
}
i = 0;
continue;
}
break;
}
i += size;
}
/*
* Choose which icon approximates our desired size best.
*/
area = 0;
if(smaller_offset >= 0) {
if(larger_offset >= 0) {
/* choose the nearest */
#ifdef DEBUG_EWMH
fprintf(stderr, "choose nearest %d %d\n", smaller, larger);
#endif /* DEBUG_EWMH */
if((double)larger / wanted_area > (double)wanted_area / smaller) {
offset = smaller_offset;
area = smaller;
}
else {
offset = larger_offset;
area = larger;
}
}
else {
/* choose smaller */
#ifdef DEBUG_EWMH
fprintf(stderr, "choose smaller (only) %d\n", smaller);
#endif /* DEBUG_EWMH */
offset = smaller_offset;
area = smaller;
}
}
else if(larger_offset >= 0) {
/* choose larger */
#ifdef DEBUG_EWMH
fprintf(stderr, "choose larger (only) %d\n", larger);
#endif /* DEBUG_EWMH */
offset = larger_offset;
area = larger;
}
else {
/* no icons found at all? */
#ifdef DEBUG_EWMH
fprintf(stderr, "nothing to choose from\n");
#endif /* DEBUG_EWMH */
XFree(prop);
return NULL;
}
/*
* Now fetch the pixels.
*/
#ifdef DEBUG_EWMH
fprintf(stderr, "offset = %d fetch_offset = %d\n", offset, fetch_offset);
fprintf(stderr, "offset + 2 + area = %d fetch_offset + nitems = %ld\n",
offset + 2 + area, fetch_offset + nitems);
#endif /* DEBUG_EWMH */
if(offset < fetch_offset ||
offset + 2 + area > fetch_offset + nitems) {
XFree(prop);
fetch_offset = offset;
#ifdef DEBUG_EWMH
fprintf(stderr, "refetching from %d\n", fetch_offset);
#endif /* DEBUG_EWMH */
if(XGetWindowProperty(dpy, twm_win->w, XA__NET_WM_ICON,
fetch_offset, 2 + area, False, XA_CARDINAL,
&actual_type, &actual_format, &nitems,
&bytes_after, (unsigned char **)&prop) != Success) {
return NULL;
}
}
i = offset - fetch_offset;
width = prop[i++];
height = prop[i++];
#ifdef DEBUG_EWMH
fprintf(stderr, "Chosen [%d] w=%d h=%d area=%d\n", offset, width, height, area);
#endif /* DEBUG_EWMH */
assert(width * height == area);
Image *image = ExtractIcon(scr, &prop[i], width, height);
XFree(prop);
return image;
}
static uint16_t *buffer_16bpp;
static uint32_t *buffer_32bpp;
static void convert_for_16(int w, int x, int y, int argb)
{
int r = (argb >> 16) & 0xFF;
int g = (argb >> 8) & 0xFF;
int b = (argb >> 0) & 0xFF;
buffer_16bpp [y * w + x] = ((r >> 3) << 11) + ((g >> 2) << 5) + (b >> 3);
}
static void convert_for_32(int w, int x, int y, int argb)
{
buffer_32bpp [y * w + x] = argb & 0x00FFFFFF;
}
static Image *ExtractIcon(ScreenInfo *scr, unsigned long *prop, int width,
int height)
{
XImage *ximage;
void (*store_data)(int w, int x, int y, int argb);
int x, y, transparency;
int rowbytes;
unsigned char *maskbits;
GC gc;
Pixmap pixret;
Pixmap mask;
Image *image;
int i;
ximage = NULL;
/** XXX sort of duplicated from util.c:LoadJpegImage() */
if(scr->d_depth == 16) {
store_data = convert_for_16;
buffer_16bpp = malloc(width * height * sizeof(buffer_16bpp[0]));
buffer_32bpp = NULL;
ximage = XCreateImage(dpy, CopyFromParent, scr->d_depth, ZPixmap, 0,
(char *) buffer_16bpp, width, height, 16, width * 2);
}
else if(scr->d_depth == 24 || scr->d_depth == 32) {
store_data = convert_for_32;
buffer_32bpp = malloc(width * height * sizeof(buffer_32bpp[0]));
buffer_16bpp = NULL;
ximage = XCreateImage(dpy, CopyFromParent, scr->d_depth, ZPixmap, 0,
(char *) buffer_32bpp, width, height, 32, width * 4);
}
else {
#ifdef DEBUG_EWMH
fprintf(stderr, "Screen unsupported depth for 32-bit icon: %d\n", scr->d_depth);
#endif /* DEBUG_EWMH */
XFree(prop);
return NULL;
}
if(ximage == NULL) {
#ifdef DEBUG_EWMH
fprintf(stderr, "cannot create image for icon\n");
#endif /* DEBUG_EWMH */
XFree(prop);
return NULL;
}
transparency = 0;
rowbytes = (width + 7) / 8;
maskbits = calloc(height, rowbytes);
/*
* Copy all ARGB pixels to the pixmap (the RGB part), and the bitmap (the
* Alpha, or opaqueness part). If any pixels are transparent, we're going
* to need a shape.
*/
i = 0;
for(y = 0; y < height; y++) {
for(x = 0; x < width; x++) {
unsigned long argb = prop[i++];
store_data(width, x, y, argb);
int opaque = ((argb >> 24) & 0xFF) >= 0x80; /* arbitrary cutoff */
if(opaque) {
maskbits [rowbytes * y + (x / 8)] |= 0x01 << (x % 8);
}
else {
transparency = 1;
}
}
}
gc = DefaultGC(dpy, scr->screen);
pixret = XCreatePixmap(dpy, scr->Root, width, height, scr->d_depth);
XPutImage(dpy, pixret, gc, ximage, 0, 0, 0, 0, width, height);
XDestroyImage(ximage); /* also frees buffer_{16,32}bpp */
ximage = NULL;
mask = None;
if(transparency) {
mask = XCreatePixmapFromBitmapData(dpy, scr->Root, (char *)maskbits,
width, height, 1, 0, 1);
}
free(maskbits);
image = AllocImage();
image->width = width;
image->height = height;
image->pixmap = pixret;
image->mask = mask;
return image;
}
/*
* Handle a PropertyNotify on _NET_WM_ICON.
*/
static void EwmhHandle_NET_WM_ICONNotify(XPropertyEvent *event,
TwmWindow *twm_win)
{
unsigned long valuemask; /* mask for create windows */
XSetWindowAttributes attributes; /* attributes for create windows */
Icon *icon = twm_win->icon;
int x;
#ifdef DEBUG_EWMH
fprintf(stderr, "EwmhHandlePropertyNotify: NET_WM_ICON\n");
#endif /* DEBUG_EWMH */
/*
* If there is no icon yet, we'll look at this property
* later, if and when we do create an icon.
*/
if(!icon || icon->match != match_net_wm_icon) {
#ifdef DEBUG_EWMH
fprintf(stderr, "no icon, or not match_net_wm_icon\n");
#endif /* DEBUG_EWMH */
return;
}
Image *image = EwmhGetIcon(Scr, twm_win);
/* TODO: de-duplicate with handling of XA_WM_HINTS */
{
Image *old_image = icon->image;
icon->image = image;
FreeImage(old_image);
}
if(twm_win->icon->bm_w) {
XDestroyWindow(dpy, twm_win->icon->bm_w);
}
valuemask = CWBackPixmap;
attributes.background_pixmap = image->pixmap;
x = GetIconOffset(twm_win->icon);
twm_win->icon->bm_w =
XCreateWindow(dpy, twm_win->icon->w, x, 0,
twm_win->icon->width,
twm_win->icon->height,
0, Scr->d_depth,
CopyFromParent, Scr->d_visual,
valuemask, &attributes);
if(image->mask) {
XShapeCombineMask(dpy, twm_win->icon->bm_w, ShapeBounding, 0, 0, image->mask,
ShapeSet);
XShapeCombineMask(dpy, twm_win->icon->w, ShapeBounding, x, 0, image->mask,
ShapeSet);
}
else {
XRectangle rect;
rect.x = x;
rect.y = 0;
rect.width = twm_win->icon->width;
rect.height = twm_win->icon->height;
XShapeCombineRectangles(dpy, twm_win->icon->w, ShapeBounding, 0,
0, &rect, 1, ShapeUnion, 0);
}
XMapSubwindows(dpy, twm_win->icon->w);