suckless-utils/dwm/patches/dwm-winicon-6.3-v2.1.diff

diff --git a/config.def.h b/config.def.h
index a2ac963..322d181 100644
--- a/config.def.h
+++ b/config.def.h
@@ -5,6 +5,8 @@ static const unsigned int borderpx  = 1;        /* border pixel of windows */
 static const unsigned int snap      = 32;       /* snap pixel */
 static const int showbar            = 1;        /* 0 means no bar */
 static const int topbar             = 1;        /* 0 means bottom bar */
+#define ICONSIZE 16   /* icon size */
+#define ICONSPACING 5 /* space between icon and title */
 static const char *fonts[]          = { "monospace:size=10" };
 static const char dmenufont[]       = "monospace:size=10";
 static const char col_gray1[]       = "#222222";
diff --git a/config.mk b/config.mk
index b6eb7e0..f3c01b0 100644
--- a/config.mk
+++ b/config.mk
@@ -22,7 +22,7 @@ FREETYPEINC = /usr/include/freetype2
 
 # includes and libs
 INCS = -I${X11INC} -I${FREETYPEINC}
-LIBS = -L${X11LIB} -lX11 ${XINERAMALIBS} ${FREETYPELIBS}
+LIBS = -L${X11LIB} -lX11 ${XINERAMALIBS} ${FREETYPELIBS} -lXrender -lImlib2
 
 # flags
 CPPFLAGS = -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_POSIX_C_SOURCE=200809L -DVERSION=\"${VERSION}\" ${XINERAMAFLAGS}
diff --git a/drw.c b/drw.c
index 4cdbcbe..9b474c5 100644
--- a/drw.c
+++ b/drw.c
@@ -4,6 +4,7 @@
 #include <string.h>
 #include <X11/Xlib.h>
 #include <X11/Xft/Xft.h>
+#include <Imlib2.h>
 
 #include "drw.h"
 #include "util.h"
@@ -71,6 +72,7 @@ drw_create(Display *dpy, int screen, Window root, unsigned int w, unsigned int h
 	drw->w = w;
 	drw->h = h;
 	drw->drawable = XCreatePixmap(dpy, root, w, h, DefaultDepth(dpy, screen));
+	drw->picture = XRenderCreatePicture(dpy, drw->drawable, XRenderFindVisualFormat(dpy, DefaultVisual(dpy, screen)), 0, NULL);
 	drw->gc = XCreateGC(dpy, root, 0, NULL);
 	XSetLineAttributes(dpy, drw->gc, 1, LineSolid, CapButt, JoinMiter);
 
@@ -85,14 +87,18 @@ drw_resize(Drw *drw, unsigned int w, unsigned int h)
 
 	drw->w = w;
 	drw->h = h;
+	if (drw->picture)
+		XRenderFreePicture(drw->dpy, drw->picture);
 	if (drw->drawable)
 		XFreePixmap(drw->dpy, drw->drawable);
 	drw->drawable = XCreatePixmap(drw->dpy, drw->root, w, h, DefaultDepth(drw->dpy, drw->screen));
+	drw->picture = XRenderCreatePicture(drw->dpy, drw->drawable, XRenderFindVisualFormat(drw->dpy, DefaultVisual(drw->dpy, drw->screen)), 0, NULL);
 }
 
 void
 drw_free(Drw *drw)
 {
+	XRenderFreePicture(drw->dpy, drw->picture);
 	XFreePixmap(drw->dpy, drw->drawable);
 	XFreeGC(drw->dpy, drw->gc);
 	drw_fontset_free(drw->fonts);
@@ -236,6 +242,67 @@ drw_setscheme(Drw *drw, Clr *scm)
 		drw->scheme = scm;
 }
 
+Picture
+drw_picture_create_resized(Drw *drw, char *src, unsigned int srcw, unsigned int srch, unsigned int dstw, unsigned int dsth) {
+	Pixmap pm;
+	Picture pic;
+	GC gc;
+
+	if (srcw <= (dstw << 1u) && srch <= (dsth << 1u)) {
+		XImage img = {
+			srcw, srch, 0, ZPixmap, src,
+			ImageByteOrder(drw->dpy), BitmapUnit(drw->dpy), BitmapBitOrder(drw->dpy), 32,
+			32, 0, 32,
+			0, 0, 0
+		};
+		XInitImage(&img);
+
+		pm = XCreatePixmap(drw->dpy, drw->root, srcw, srch, 32);
+		gc = XCreateGC(drw->dpy, pm, 0, NULL);
+		XPutImage(drw->dpy, pm, gc, &img, 0, 0, 0, 0, srcw, srch);
+		XFreeGC(drw->dpy, gc);
+
+		pic = XRenderCreatePicture(drw->dpy, pm, XRenderFindStandardFormat(drw->dpy, PictStandardARGB32), 0, NULL);
+		XFreePixmap(drw->dpy, pm);
+
+		XRenderSetPictureFilter(drw->dpy, pic, FilterBilinear, NULL, 0);
+		XTransform xf;
+		xf.matrix[0][0] = (srcw << 16u) / dstw; xf.matrix[0][1] = 0; xf.matrix[0][2] = 0;
+		xf.matrix[1][0] = 0; xf.matrix[1][1] = (srch << 16u) / dsth; xf.matrix[1][2] = 0;
+		xf.matrix[2][0] = 0; xf.matrix[2][1] = 0; xf.matrix[2][2] = 65536;
+		XRenderSetPictureTransform(drw->dpy, pic, &xf);
+	} else {
+		Imlib_Image origin = imlib_create_image_using_data(srcw, srch, (DATA32 *)src);
+		if (!origin) return None;
+		imlib_context_set_image(origin);
+		imlib_image_set_has_alpha(1);
+		Imlib_Image scaled = imlib_create_cropped_scaled_image(0, 0, srcw, srch, dstw, dsth);
+		imlib_free_image_and_decache();
+		if (!scaled) return None;
+		imlib_context_set_image(scaled);
+		imlib_image_set_has_alpha(1);
+
+		XImage img = {
+		    dstw, dsth, 0, ZPixmap, (char *)imlib_image_get_data_for_reading_only(),
+		    ImageByteOrder(drw->dpy), BitmapUnit(drw->dpy), BitmapBitOrder(drw->dpy), 32,
+		    32, 0, 32,
+		    0, 0, 0
+		};
+		XInitImage(&img);
+
+		pm = XCreatePixmap(drw->dpy, drw->root, dstw, dsth, 32);
+		gc = XCreateGC(drw->dpy, pm, 0, NULL);
+		XPutImage(drw->dpy, pm, gc, &img, 0, 0, 0, 0, dstw, dsth);
+		imlib_free_image_and_decache();
+		XFreeGC(drw->dpy, gc);
+
+		pic = XRenderCreatePicture(drw->dpy, pm, XRenderFindStandardFormat(drw->dpy, PictStandardARGB32), 0, NULL);
+		XFreePixmap(drw->dpy, pm);
+	}
+
+	return pic;
+}
+
 void
 drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int invert)
 {
@@ -379,6 +446,14 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lp
 	return x + (render ? w : 0);
 }
 
+void
+drw_pic(Drw *drw, int x, int y, unsigned int w, unsigned int h, Picture pic)
+{
+	if (!drw)
+		return;
+	XRenderComposite(drw->dpy, PictOpOver, pic, None, drw->picture, 0, 0, 0, 0, x, y, w, h);
+}
+
 void
 drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h)
 {
diff --git a/drw.h b/drw.h
index 4bcd5ad..71aefa2 100644
--- a/drw.h
+++ b/drw.h
@@ -21,6 +21,7 @@ typedef struct {
 	int screen;
 	Window root;
 	Drawable drawable;
+	Picture picture;
 	GC gc;
 	Clr *scheme;
 	Fnt *fonts;
@@ -49,9 +50,12 @@ void drw_cur_free(Drw *drw, Cur *cursor);
 void drw_setfontset(Drw *drw, Fnt *set);
 void drw_setscheme(Drw *drw, Clr *scm);
 
+Picture drw_picture_create_resized(Drw *drw, char *src, unsigned int src_w, unsigned int src_h, unsigned int dst_w, unsigned int dst_h);
+
 /* Drawing functions */
 void drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int invert);
 int drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lpad, const char *text, int invert);
+void drw_pic(Drw *drw, int x, int y, unsigned int w, unsigned int h, Picture pic);
 
 /* Map functions */
 void drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h);
diff --git a/dwm.c b/dwm.c
index a96f33c..033ccec 100644
--- a/dwm.c
+++ b/dwm.c
@@ -28,6 +28,8 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <limits.h>
+#include <stdint.h>
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <X11/cursorfont.h>
@@ -60,7 +62,7 @@
 /* enums */
 enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
 enum { SchemeNorm, SchemeSel }; /* color schemes */
-enum { NetSupported, NetWMName, NetWMState, NetWMCheck,
+enum { NetSupported, NetWMName, NetWMIcon, NetWMState, NetWMCheck,
        NetWMFullscreen, NetActiveWindow, NetWMWindowType,
        NetWMWindowTypeDialog, NetClientList, NetLast }; /* EWMH atoms */
 enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
@@ -93,6 +95,7 @@ struct Client {
 	int bw, oldbw;
 	unsigned int tags;
 	int isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
+	unsigned int icw, ich; Picture icon;
 	Client *next;
 	Client *snext;
 	Monitor *mon;
@@ -170,6 +173,7 @@ static void focusin(XEvent *e);
 static void focusmon(const Arg *arg);
 static void focusstack(const Arg *arg);
 static Atom getatomprop(Client *c, Atom prop);
+static Picture geticonprop(Window w, unsigned int *icw, unsigned int *ich);
 static int getrootptr(int *x, int *y);
 static long getstate(Window w);
 static int gettextprop(Window w, Atom atom, char *text, unsigned int size);
@@ -214,6 +218,7 @@ static void togglebar(const Arg *arg);
 static void togglefloating(const Arg *arg);
 static void toggletag(const Arg *arg);
 static void toggleview(const Arg *arg);
+static void freeicon(Client *c);
 static void unfocus(Client *c, int setfocus);
 static void unmanage(Client *c, int destroyed);
 static void unmapnotify(XEvent *e);
@@ -225,6 +230,7 @@ static void updatenumlockmask(void);
 static void updatesizehints(Client *c);
 static void updatestatus(void);
 static void updatetitle(Client *c);
+static void updateicon(Client *c);
 static void updatewindowtype(Client *c);
 static void updatewmhints(Client *c);
 static void view(const Arg *arg);
@@ -735,7 +741,8 @@ drawbar(Monitor *m)
 	if ((w = m->ww - tw - x) > bh) {
 		if (m->sel) {
 			drw_setscheme(drw, scheme[m == selmon ? SchemeSel : SchemeNorm]);
-			drw_text(drw, x, 0, w, bh, lrpad / 2, m->sel->name, 0);
+			drw_text(drw, x, 0, w, bh, lrpad / 2 + (m->sel->icon ? m->sel->icw + ICONSPACING : 0), m->sel->name, 0);
+			if (m->sel->icon) drw_pic(drw, x + lrpad / 2, (bh - m->sel->ich) / 2, m->sel->icw, m->sel->ich, m->sel->icon);
 			if (m->sel->isfloating)
 				drw_rect(drw, x + boxs, boxs, boxw, boxw, m->sel->isfixed, 0);
 		} else {
@@ -875,6 +882,67 @@ getatomprop(Client *c, Atom prop)
 	return atom;
 }
 
+static uint32_t prealpha(uint32_t p) {
+	uint8_t a = p >> 24u;
+	uint32_t rb = (a * (p & 0xFF00FFu)) >> 8u;
+	uint32_t g = (a * (p & 0x00FF00u)) >> 8u;
+	return (rb & 0xFF00FFu) | (g & 0x00FF00u) | (a << 24u);
+}
+
+Picture
+geticonprop(Window win, unsigned int *picw, unsigned int *pich)
+{
+	int format;
+	unsigned long n, extra, *p = NULL;
+	Atom real;
+
+	if (XGetWindowProperty(dpy, win, netatom[NetWMIcon], 0L, LONG_MAX, False, AnyPropertyType, 
+						   &real, &format, &n, &extra, (unsigned char **)&p) != Success)
+		return None; 
+	if (n == 0 || format != 32) { XFree(p); return None; }
+
+	unsigned long *bstp = NULL;
+	uint32_t w, h, sz;
+	{
+		unsigned long *i; const unsigned long *end = p + n;
+		uint32_t bstd = UINT32_MAX, d, m;
+		for (i = p; i < end - 1; i += sz) {
+			if ((w = *i++) >= 16384 || (h = *i++) >= 16384) { XFree(p); return None; }
+			if ((sz = w * h) > end - i) break;
+			if ((m = w > h ? w : h) >= ICONSIZE && (d = m - ICONSIZE) < bstd) { bstd = d; bstp = i; }
+		}
+		if (!bstp) {
+			for (i = p; i < end - 1; i += sz) {
+				if ((w = *i++) >= 16384 || (h = *i++) >= 16384) { XFree(p); return None; }
+				if ((sz = w * h) > end - i) break;
+				if ((d = ICONSIZE - (w > h ? w : h)) < bstd) { bstd = d; bstp = i; }
+			}
+		}
+		if (!bstp) { XFree(p); return None; }
+	}
+
+	if ((w = *(bstp - 2)) == 0 || (h = *(bstp - 1)) == 0) { XFree(p); return None; }
+
+	uint32_t icw, ich;
+	if (w <= h) {
+		ich = ICONSIZE; icw = w * ICONSIZE / h;
+		if (icw == 0) icw = 1;
+	}
+	else {
+		icw = ICONSIZE; ich = h * ICONSIZE / w;
+		if (ich == 0) ich = 1;
+	}
+	*picw = icw; *pich = ich;
+
+	uint32_t i, *bstp32 = (uint32_t *)bstp;
+	for (sz = w * h, i = 0; i < sz; ++i) bstp32[i] = prealpha(bstp[i]);
+
+	Picture ret = drw_picture_create_resized(drw, (char *)bstp, w, h, icw, ich);
+	XFree(p);
+
+	return ret;
+}
+
 int
 getrootptr(int *x, int *y)
 {
@@ -1034,6 +1102,7 @@ manage(Window w, XWindowAttributes *wa)
 	c->h = c->oldh = wa->height;
 	c->oldbw = wa->border_width;
 
+	updateicon(c);
 	updatetitle(c);
 	if (XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
 		c->mon = t->mon;
@@ -1244,6 +1313,11 @@ propertynotify(XEvent *e)
 			if (c == c->mon->sel)
 				drawbar(c->mon);
 		}
+		else if (ev->atom == netatom[NetWMIcon]) {
+			updateicon(c);
+			if (c == c->mon->sel)
+				drawbar(c->mon);
+		}
 		if (ev->atom == netatom[NetWMWindowType])
 			updatewindowtype(c);
 	}
@@ -1560,6 +1634,7 @@ setup(void)
 	netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
 	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
 	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
+	netatom[NetWMIcon] = XInternAtom(dpy, "_NET_WM_ICON", False);
 	netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
 	netatom[NetWMCheck] = XInternAtom(dpy, "_NET_SUPPORTING_WM_CHECK", False);
 	netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
@@ -1752,6 +1827,15 @@ toggleview(const Arg *arg)
 	}
 }
 
+void
+freeicon(Client *c)
+{
+	if (c->icon) {
+		XRenderFreePicture(dpy, c->icon);
+		c->icon = None;
+	}
+}
+
 void
 unfocus(Client *c, int setfocus)
 {
@@ -1773,6 +1857,7 @@ unmanage(Client *c, int destroyed)
 
 	detach(c);
 	detachstack(c);
+	freeicon(c);
 	if (!destroyed) {
 		wc.border_width = c->oldbw;
 		XGrabServer(dpy); /* avoid race conditions */
@@ -2007,6 +2092,13 @@ updatetitle(Client *c)
 		strcpy(c->name, broken);
 }
 
+void
+updateicon(Client *c)
+{
+	freeicon(c);
+	c->icon = geticonprop(c->win, &c->icw, &c->ich);
+}
+
 void
 updatewindowtype(Client *c)
 {