From d1a3c6cd1f8c84109ac181c8a7dbb29181862aea Mon Sep 17 00:00:00 2001
From: Luke Smith <luke@lukesmith.xyz>
Date: Sat, 8 Feb 2020 15:27:02 -0500
Subject: alpha patch for embedded in transparent st

---
 dmenu.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 54 insertions(+), 4 deletions(-)

(limited to 'dmenu.c')

diff --git a/dmenu.c b/dmenu.c
index 6b8f51b..8f72f60 100644
--- a/dmenu.c
+++ b/dmenu.c
@@ -25,6 +25,9 @@
 #define LENGTH(X)             (sizeof X / sizeof X[0])
 #define TEXTW(X)              (drw_fontset_getwidth(drw, (X)) + lrpad)
 
+/* define opaqueness */
+#define OPAQUE 0xFFU
+
 /* enums */
 enum { SchemeNorm, SchemeSel, SchemeOut, SchemeLast }; /* color schemes */
 
@@ -51,6 +54,10 @@ static Window root, parentwin, win;
 static XIC xic;
 
 static Drw *drw;
+static int usergb = 0;
+static Visual *visual;
+static int depth;
+static Colormap cmap;
 static Clr *scheme[SchemeLast];
 
 #include "config.h"
@@ -58,6 +65,46 @@ static Clr *scheme[SchemeLast];
 static int (*fstrncmp)(const char *, const char *, size_t) = strncmp;
 static char *(*fstrstr)(const char *, const char *) = strstr;
 
+
+static void
+xinitvisual()
+{
+	XVisualInfo *infos;
+	XRenderPictFormat *fmt;
+	int nitems;
+	int i;
+
+	XVisualInfo tpl = {
+		.screen = screen,
+		.depth = 32,
+		.class = TrueColor
+	};
+
+	long masks = VisualScreenMask | VisualDepthMask | VisualClassMask;
+
+	infos = XGetVisualInfo(dpy, masks, &tpl, &nitems);
+	visual = NULL;
+
+	for (i = 0; i < nitems; i++){
+		fmt = XRenderFindVisualFormat(dpy, infos[i].visual);
+		if (fmt->type == PictTypeDirect && fmt->direct.alphaMask) {
+			visual = infos[i].visual;
+			depth = infos[i].depth;
+			cmap = XCreateColormap(dpy, root, visual, AllocNone);
+			usergb = 1;
+			break;
+		}
+	}
+
+	XFree(infos);
+
+	if (! visual) {
+		visual = DefaultVisual(dpy, screen);
+		depth = DefaultDepth(dpy, screen);
+		cmap = DefaultColormap(dpy, screen);
+	}
+}
+
 static void
 appenditem(struct item *item, struct item **list, struct item **last)
 {
@@ -597,7 +644,7 @@ setup(void)
 #endif
 	/* init appearance */
 	for (j = 0; j < SchemeLast; j++)
-		scheme[j] = drw_scm_create(drw, colors[j], 2);
+		scheme[j] = drw_scm_create(drw, colors[j], alphas[j], 2);
 
 	clip = XInternAtom(dpy, "CLIPBOARD",   False);
 	utf8 = XInternAtom(dpy, "UTF8_STRING", False);
@@ -653,10 +700,12 @@ setup(void)
 	/* create menu window */
 	swa.override_redirect = True;
 	swa.background_pixel = scheme[SchemeNorm][ColBg].pixel;
+	swa.border_pixel = 0;
+	swa.colormap = cmap;
 	swa.event_mask = ExposureMask | KeyPressMask | VisibilityChangeMask;
 	win = XCreateWindow(dpy, parentwin, x, y, mw, mh, 0,
-	                    CopyFromParent, CopyFromParent, CopyFromParent,
-	                    CWOverrideRedirect | CWBackPixel | CWEventMask, &swa);
+	                    depth, InputOutput, visual,
+	                    CWOverrideRedirect | CWBackPixel | CWColormap |  CWEventMask | CWBorderPixel, &swa);
 	XSetClassHint(dpy, win, &ch);
 
 	/* open input methods */
@@ -742,7 +791,8 @@ main(int argc, char *argv[])
 	if (!XGetWindowAttributes(dpy, parentwin, &wa))
 		die("could not get embedding window attributes: 0x%lx",
 		    parentwin);
-	drw = drw_create(dpy, screen, root, wa.width, wa.height);
+	xinitvisual();
+	drw = drw_create(dpy, screen, root, wa.width, wa.height, visual, depth, cmap);
 	if (!drw_fontset_create(drw, fonts, LENGTH(fonts)))
 		die("no fonts could be loaded.");
 	lrpad = drw->fonts->h;
-- 
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