st/patches/transparency.diff

--- st/config.def.h	2018-01-19 12:48:07.280548253 -0700
+++ st-transparent/config.def.h	2018-01-19 13:15:25.443443692 -0700
@@ -82,6 +82,9 @@
  */
 static unsigned int tabspaces = 8;
 
+/* bg opacity */
+static const int alpha = 0xdd;
+
 /* Terminal colors (16 first used in escape sequence) */
 static const char *colorname[] = {
 	/* solarized dark */
@@ -101,6 +104,7 @@
 	"#6c71c4",  /* 13: brmagenta*/
 	"#93a1a1",  /* 14: brcyan   */
 	"#fdf6e3",  /* 15: brwhite  */
+	"black",
 };
 
 /* Terminal colors for alternate (light) palette */
@@ -122,6 +126,7 @@
 	"#6c71c4",  /* 13: brmagenta*/
 	"#586e75",  /* 14: brcyan   */
 	"#002b36",  /* 15: brwhite  */
+	"black",
 };
 
 /*
@@ -129,7 +134,7 @@
  * foreground, background, cursor, reverse cursor
  */
 static unsigned int defaultfg = 12;
-static unsigned int defaultbg = 8;
+static unsigned int defaultbg = 255;
 static unsigned int defaultcs = 14;
 static unsigned int defaultrcs = 15;
 
--- st/config.mk	2018-01-17 23:51:03.804274540 -0700
+++ st-transparent/config.mk	2018-01-19 12:56:45.323928617 -0700
@@ -14,7 +14,7 @@
 INCS = -I. -I/usr/include -I${X11INC} \
        `pkg-config --cflags fontconfig` \
        `pkg-config --cflags freetype2`
-LIBS = -L/usr/lib -lc -L${X11LIB} -lm -lrt -lX11 -lutil -lXft \
+LIBS = -L/usr/lib -lc -L${X11LIB} -lm -lrt -lX11 -lutil -lXext -lXft -lXrender\
        `pkg-config --libs fontconfig`  \
        `pkg-config --libs freetype2`
 
--- st/st.c	2018-01-18 19:01:56.693663129 -0700
+++ st-transparent/st.c	2018-01-19 13:03:28.877184002 -0700
@@ -61,6 +61,7 @@
 #define XK_ANY_MOD    UINT_MAX
 #define XK_NO_MOD     0
 #define XK_SWITCH_MOD (1<<13)
+#define OPAQUE 0Xff
 #define histsize 2000
 
 /* macros */
@@ -83,6 +84,8 @@
 				(t1.tv_nsec-t2.tv_nsec)/1E6)
 #define MODBIT(x, set, bit)	((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
 
+#define USE_ARGB (alpha != OPAQUE && opt_embed == NULL)
+
 #define TRUECOLOR(r,g,b)	(1 << 24 | (r) << 16 | (g) << 8 | (b))
 #define IS_TRUECOL(x)		(1 << 24 & (x))
 #define TRUERED(x)		(((x) & 0xff0000) >> 8)
@@ -281,6 +284,7 @@
 	int w, h; /* window width and height */
 	int ch; /* char height */
 	int cw; /* char width  */
+	int depth; /*  bit depth */
 	int cyo; /* char y offset */
 	char state; /* focus, redraw, visible */
 	int cursor; /* cursor style */
@@ -3326,7 +3330,7 @@
 
 	XFreePixmap(xw.dpy, xw.buf);
 	xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
-			DefaultDepth(xw.dpy, xw.scr));
+			xw.depth);
 	XftDrawChange(xw.draw, xw.buf);
 	xclear(0, 0, xw.w, xw.h);
 }
@@ -3385,6 +3389,14 @@
 			else
 				die("Could not allocate color %d\n", i);
 		}
+
+	/* set alpha value of bg color */
+	if (USE_ARGB) {
+		dc.col[defaultbg].color.alpha = (0xffff * alpha) / OPAQUE; //0xcccc;
+		dc.col[defaultbg].pixel &= 0x00111111;
+		dc.col[defaultbg].pixel |= alpha << 24; // 0xcc000000;
+	}
+
 	loaded = 1;
 }
 
@@ -3405,6 +3417,15 @@
 
 	return 0;
 }
+void
+xtermclear(int col1, int row1, int col2, int row2) {
+	XftDrawRect(xw.draw,
+			&dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
+			borderpx + col1 * xw.cw,
+			borderpx + row1 * xw.ch,
+			(col2-col1+1) * xw.cw,
+			(row2-row1+1) * xw.ch);
+}
 
 /*
  * Absolute coordinates.
@@ -3677,7 +3698,38 @@
 	if (!(xw.dpy = XOpenDisplay(NULL)))
 		die("Can't open display\n");
 	xw.scr = XDefaultScreen(xw.dpy);
-	xw.vis = XDefaultVisual(xw.dpy, xw.scr);
+	xw.depth = (USE_ARGB) ? 32: XDefaultDepth(xw.dpy, xw.scr);
+	if (! USE_ARGB)
+		xw.vis = XDefaultVisual(xw.dpy, xw.scr);
+	else {
+		XVisualInfo *vis;
+		XRenderPictFormat *fmt;
+		int nvi;
+		int i;
+
+		XVisualInfo tpl = {
+			.screen = xw.scr,
+			.depth = 32,
+			.class = TrueColor
+		};
+
+		vis = XGetVisualInfo(xw.dpy, VisualScreenMask | VisualDepthMask | VisualClassMask, &tpl, &nvi);
+		xw.vis = NULL;
+		for(i = 0; i < nvi; i ++) {
+			fmt = XRenderFindVisualFormat(xw.dpy, vis[i].visual);
+			if (fmt->type == PictTypeDirect && fmt->direct.alphaMask) {
+				xw.vis = vis[i].visual;
+				break;
+			}
+		}
+
+		XFree(vis);
+
+		if (! xw.vis) {
+			fprintf(stderr, "Couldn't find ARGB visual.\n");
+			exit(1);
+		}
+	}
 
 	/* font */
 	if (!FcInit())
@@ -3687,7 +3739,10 @@
 	xloadfonts(usedfont, 0);
 
 	/* colors */
-	xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
+	if (! USE_ARGB)
+		xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
+	else
+		xw.cmap = XCreateColormap(xw.dpy, XRootWindow(xw.dpy, xw.scr), xw.vis, None);
 	xloadcols();
 
 	/* adjust fixed window geometry */
@@ -3710,16 +3765,17 @@
 	if (!(opt_embed && (parent = strtol(opt_embed, NULL, 0))))
 		parent = XRootWindow(xw.dpy, xw.scr);
 	xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
-			xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
+			xw.w, xw.h, 0, xw.depth, InputOutput,
 			xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
 			| CWEventMask | CWColormap, &xw.attrs);
 
 	memset(&gcvalues, 0, sizeof(gcvalues));
 	gcvalues.graphics_exposures = False;
-	dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
+	xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h, xw.depth);
+	dc.gc = XCreateGC(xw.dpy,
+			(USE_ARGB)? xw.buf: parent,
+			GCGraphicsExposures,
 			&gcvalues);
-	xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
-			DefaultDepth(xw.dpy, xw.scr));
 	XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
 	XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);