Hi,
just a proof of concept, no error-handling for non 32bit colordepth,
requires composite manager like xcompmgr. I noticed this feature is not
very popular so if you dont like the idea you better not apply the
patch ;)
Edit ALPHA macro to change level of transparency (0x00 is invisible,
0xff is nontransparent).
Note: This patch will add real transparency to the background of the
terminal while the foreground still remains with no transparency.
Diff against tip/148.
Regards,
Leon Winter
diff -r 1cd0262c5b69 st.c
--- a/st.c Sat Sep 11 16:07:36 2010 +0200
+++ b/st.c Tue Sep 14 19:27:33 2010 +0200
@@ -222,6 +222,8 @@
static Selection sel;
static char *opt_cmd = NULL;
static char *opt_title = NULL;
+int bitdepth = 32;
+#define ALPHA 0xcc
void
selinit(void) {
@@ -1127,14 +1129,14 @@
xloadcols(void) {
int i, r, g, b;
XColor color;
- unsigned long white = WhitePixel(xw.dis, xw.scr);
+ unsigned long white = WhitePixel(xw.dis, xw.scr) & 0xffffff;
for(i = 0; i < 16; i++) {
if (!XAllocNamedColor(xw.dis, xw.cmap, colorname[i], &color, &color)) {
dc.col[i] = white;
fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
} else
- dc.col[i] = color.pixel;
+ dc.col[i] = color.pixel & 0xffffff;
}
/* same colors as xterm */
@@ -1148,7 +1150,7 @@
dc.col[i] = white;
fprintf(stderr, "Could not allocate color %d\n", i);
} else
- dc.col[i] = color.pixel;
+ dc.col[i] = color.pixel & 0xffffff;
i++;
}
@@ -1158,13 +1160,13 @@
dc.col[i] = white;
fprintf(stderr, "Could not allocate color %d\n", i);
} else
- dc.col[i] = color.pixel;
+ dc.col[i] = color.pixel & 0xffffff;
}
}
void
xclear(int x1, int y1, int x2, int y2) {
- XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
+ XSetForeground(xw.dis, dc.gc, ALPHA << 24 | dc.col[DefaultBG]);
XFillRectangle(xw.dis, xw.buf, dc.gc,
x1 * xw.cw, y1 * xw.ch,
(x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
@@ -1189,6 +1191,7 @@
void
xinit(void) {
+ XVisualInfo vinfo;
XSetWindowAttributes attrs;
if(!(xw.dis = XOpenDisplay(NULL)))
@@ -1204,7 +1207,8 @@
xw.ch = dc.font->ascent + dc.font->descent;
/* colors */
- xw.cmap = XDefaultColormap(xw.dis, xw.scr);
+ XMatchVisualInfo(xw.dis, xw.scr, bitdepth, TrueColor, &vinfo);
+ xw.cmap = XCreateColormap(xw.dis, XRootWindow(xw.dis, xw.scr), vinfo.visual, None);
xloadcols();
/* window - default size */
@@ -1213,8 +1217,8 @@
xw.h = xw.bufh + 2*BORDER;
xw.w = xw.bufw + 2*BORDER;
- attrs.background_pixel = dc.col[DefaultBG];
- attrs.border_pixel = dc.col[DefaultBG];
+ attrs.background_pixel = ALPHA << 24 | dc.col[DefaultBG];
+ attrs.border_pixel = ALPHA << 24 | dc.col[DefaultBG];
attrs.bit_gravity = NorthWestGravity;
attrs.event_mask = FocusChangeMask | KeyPressMask
| ExposureMask | VisibilityChangeMask | StructureNotifyMask
@@ -1222,12 +1226,12 @@
attrs.colormap = xw.cmap;
xw.win = XCreateWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
- xw.w, xw.h, 0, XDefaultDepth(xw.dis, xw.scr), InputOutput,
- XDefaultVisual(xw.dis, xw.scr),
+ xw.w, xw.h, 0, bitdepth, InputOutput,
+ vinfo.visual,
CWBackPixel | CWBorderPixel | CWBitGravity | CWEventMask
| CWColormap,
&attrs);
- xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
+ xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, bitdepth);
/* gc */
dc.gc = XCreateGC(xw.dis, xw.win, 0, NULL);
@@ -1248,8 +1252,8 @@
else
xfg = dc.col[base.fg], xbg = dc.col[base.bg];
- XSetBackground(xw.dis, dc.gc, xbg);
- XSetForeground(xw.dis, dc.gc, xfg);
+ XSetBackground(xw.dis, dc.gc, ALPHA << 24 | xbg);
+ XSetForeground(xw.dis, dc.gc, 0xff << 24 | xfg);
if(base.mode & ATTR_GFX)
for(i = 0; i < len; i++) {
@@ -1297,8 +1301,8 @@
void
xdrawc(int x, int y, Glyph g) {
XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
- XSetBackground(xw.dis, dc.gc, dc.col[g.bg]);
- XSetForeground(xw.dis, dc.gc, dc.col[g.fg]);
+ XSetBackground(xw.dis, dc.gc, ALPHA << 24 | dc.col[g.bg]);
+ XSetForeground(xw.dis, dc.gc, 0xff << 24 | dc.col[g.fg]);
XSetFont(xw.dis, dc.gc, g.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
XDrawImageString(xw.dis, xw.buf, dc.gc, r.x, r.y+dc.font->ascent, &g.c, 1);
}
@@ -1325,7 +1329,10 @@
int i, x, y, ox;
Glyph base, new;
char buf[DRAW_BUF_SIZ];
-
+#if 1
+ XSetForeground(xw.dis, dc.gc, ALPHA << 24 | dc.col[DefaultBG]);
+ XFillRectangle(xw.dis, xw.buf, dc.gc, 0, 0, xw.bufw, xw.bufh);
+#endif
if(!xw.vis)
return;
@@ -1460,7 +1467,7 @@
xw.bufh = MAX(1, xw.bufh);
xw.bufw = MAX(1, xw.bufw);
XFreePixmap(xw.dis, xw.buf);
- xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
+ xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, bitdepth);
}
void
