Apply Alpha patch

Patch Homepage: https://st.suckless.org/patches/alpha/
Patch Link: https://st.suckless.org/patches/alpha/st-alpha-0.8.2.diff
Additional notes: patch applied manually

1 files changed, 30 insertions, 10 deletions

diff --git a/x.c b/x.c
index be1d3d0..5afa802 100644
--- a/x.c
+++ b/x.c
@@ -105,6 +105,7 @@ typedef struct {
         XSetWindowAttributes attrs;
         int scr;
         int isfixed; /* is fixed geometry? */
+    int depth; /* bit depth */
         int l, t; /* left and top offset */
         int gm; /* geometry mask */
 } XWindow;
@@ -244,6 +245,7 @@ static char *usedfont = NULL;
 static double usedfontsize = 0;
 static double defaultfontsize = 0;
 
+static char *opt_alpha = NULL;
 static char *opt_class = NULL;
 static char **opt_cmd  = NULL;
 static char *opt_embed = NULL;
@@ -722,7 +724,7 @@ xresize(int col, int row)
 
         XFreePixmap(xw.dpy, xw.buf);
         xw.buf = XCreatePixmap(xw.dpy, xw.win, win.w, win.h,
-                        DefaultDepth(xw.dpy, xw.scr));
+                        xw.depth);
         XftDrawChange(xw.draw, xw.buf);
         xclear(0, 0, win.w, win.h);
 
@@ -782,6 +784,13 @@ xloadcols(void)
                         else
                                 die("could not allocate color %d\n", i);
                 }
+
+        /* set alpha value of bg color */
+        if (opt_alpha)
+                alpha = strtof(opt_alpha, NULL);
+        dc.col[defaultbg].color.alpha = (unsigned short)(0xffff * alpha);
+        dc.col[defaultbg].pixel &= 0x00FFFFFF;
+        dc.col[defaultbg].pixel |= (unsigned char)(0xff * alpha) << 24;
         loaded = 1;
 }
 
@@ -1187,11 +1196,23 @@ xinit(int cols, int rows)
         Window parent;
         pid_t thispid = getpid();
         XColor xmousefg, xmousebg;
+        XWindowAttributes attr;
+        XVisualInfo vis;
 
         if (!(xw.dpy = XOpenDisplay(NULL)))
                 die("can't open display\n");
         xw.scr = XDefaultScreen(xw.dpy);
-        xw.vis = XDefaultVisual(xw.dpy, xw.scr);
+
+        if (!(opt_embed && (parent = strtol(opt_embed, NULL, 0)))) {
+                parent = XRootWindow(xw.dpy, xw.scr);
+                xw.depth = 32;
+        } else {
+                XGetWindowAttributes(xw.dpy, parent, &attr);
+                xw.depth = attr.depth;
+        }
+
+        XMatchVisualInfo(xw.dpy, xw.scr, xw.depth, TrueColor, &vis);
+        xw.vis = vis.visual;
 
         /* font */
         if (!FcInit())
@@ -1204,7 +1225,7 @@ xinit(int cols, int rows)
         xloadsparefonts();
 
         /* colors */
-        xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
+        xw.cmap = XCreateColormap(xw.dpy, parent, xw.vis, None);
         xloadcols();
 
         /* adjust fixed window geometry */
@@ -1224,19 +1245,15 @@ xinit(int cols, int rows)
                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
         xw.attrs.colormap = xw.cmap;
 
-        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,
-                        win.w, win.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
+                        win.w, win.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,
-                        &gcvalues);
-        xw.buf = XCreatePixmap(xw.dpy, xw.win, win.w, win.h,
-                        DefaultDepth(xw.dpy, xw.scr));
+    xw.buf = XCreatePixmap(xw.dpy, xw.win, win.w, win.h, xw.depth);
+    dc.gc = XCreateGC(xw.dpy, xw.buf, GCGraphicsExposures, &gcvalues);
         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, win.w, win.h);
 
@@ -2081,6 +2098,9 @@ main(int argc, char *argv[])
         case 'a':
                 allowaltscreen = 0;
                 break;
+        case 'A':
+                opt_alpha = EARGF(usage());
+                break;
         case 'c':
                 opt_class = EARGF(usage());
                 break;