x11-terms-st-0.8.1::gentoo-st-alpha-scrollback.diff

diff --git a/config.def.h b/config.def.h
index 82b1b09..cfbdc9f 100644
--- a/config.def.h
+++ b/config.def.h
@@ -82,6 +82,9 @@ char *termname = "st-256color";
  */
 unsigned int tabspaces = 8;
 
+/* bg opacity */
+unsigned int alpha = 0xcc;
+
 /* Terminal colors (16 first used in escape sequence) */
 static const char *colorname[] = {
 	/* 8 normal colors */
@@ -109,6 +112,7 @@ static const char *colorname[] = {
 	/* more colors can be added after 255 to use with DefaultXX */
 	"#cccccc",
 	"#555555",
+	"black,
 };
 
 
@@ -178,6 +182,8 @@ static Shortcut shortcuts[] = {
 	{ TERMMOD,              XK_Y,           selpaste,       {.i =  0} },
 	{ TERMMOD,              XK_Num_Lock,    numlock,        {.i =  0} },
 	{ TERMMOD,              XK_I,           iso14755,       {.i =  0} },
+	{ ShiftMask,            XK_Page_Up,     kscrollup,      {.i = -1} },
+	{ ShiftMask,            XK_Page_Down,   kscrolldown,    {.i = -1} },
 };
 
 /*
diff --git a/config.mk b/config.mk
index 039c42c..eb2dc01 100644
--- a/config.mk
+++ b/config.mk
@@ -14,7 +14,7 @@ X11LIB = /usr/X11R6/lib
 INCS = -I$(X11INC) \
        `pkg-config --cflags fontconfig` \
        `pkg-config --cflags freetype2`
-LIBS = -L$(X11LIB) -lm -lrt -lX11 -lutil -lXft \
+LIBS = -L$(X11LIB) -lm -lrt -lX11 -lutil -lXft -lXrender \
        `pkg-config --libs fontconfig` \
        `pkg-config --libs freetype2`
 
diff --git a/st.c b/st.c
index 0628707..2888643 100644
--- a/st.c
+++ b/st.c
@@ -121,6 +121,9 @@ typedef struct {
 	int col;      /* nb col */
 	Line *line;   /* screen */
 	Line *alt;    /* alternate screen */
+	Line hist[HISTSIZE]; /* history buffer */
+	int histi;    /* history index */
+	int scr;      /* scroll back */
 	int *dirty;   /* dirtyness of lines */
 	TCursor c;    /* cursor */
 	int ocx;      /* old cursor col */
@@ -188,8 +191,8 @@ static void tnewline(int);
 static void tputtab(int);
 static void tputc(Rune);
 static void treset(void);
-static void tscrollup(int, int);
-static void tscrolldown(int, int);
+static void tscrollup(int, int, int);
+static void tscrolldown(int, int, int);
 static void tsetattr(int *, int);
 static void tsetchar(Rune, Glyph *, int, int);
 static void tsetdirt(int, int);
@@ -431,10 +434,10 @@ tlinelen(int y)
 {
 	int i = term.col;
 
-	if (term.line[y][i - 1].mode & ATTR_WRAP)
+	if (TLINE(y)[i - 1].mode & ATTR_WRAP)
 		return i;
 
-	while (i > 0 && term.line[y][i - 1].u == ' ')
+	while (i > 0 && TLINE(y)[i - 1].u == ' ')
 		--i;
 
 	return i;
@@ -543,7 +546,7 @@ selsnap(int *x, int *y, int direction)
 		 * Snap around if the word wraps around at the end or
 		 * beginning of a line.
 		 */
-		prevgp = &term.line[*y][*x];
+		prevgp = &TLINE(*y)[*x];
 		prevdelim = ISDELIM(prevgp->u);
 		for (;;) {
 			newx = *x + direction;
@@ -558,14 +561,14 @@ selsnap(int *x, int *y, int direction)
 					yt = *y, xt = *x;
 				else
 					yt = newy, xt = newx;
-				if (!(term.line[yt][xt].mode & ATTR_WRAP))
+				if (!(TLINE(yt)[xt].mode & ATTR_WRAP))
 					break;
 			}
 
 			if (newx >= tlinelen(newy))
 				break;
 
-			gp = &term.line[newy][newx];
+			gp = &TLINE(newy)[newx];
 			delim = ISDELIM(gp->u);
 			if (!(gp->mode & ATTR_WDUMMY) && (delim != prevdelim
 					|| (delim && gp->u != prevgp->u)))
@@ -586,14 +589,14 @@ selsnap(int *x, int *y, int direction)
 		*x = (direction < 0) ? 0 : term.col - 1;
 		if (direction < 0) {
 			for (; *y > 0; *y += direction) {
-				if (!(term.line[*y-1][term.col-1].mode
+				if (!(TLINE(*y-1)[term.col-1].mode
 						& ATTR_WRAP)) {
 					break;
 				}
 			}
 		} else if (direction > 0) {
 			for (; *y < term.row-1; *y += direction) {
-				if (!(term.line[*y][term.col-1].mode
+				if (!(TLINE(*y)[term.col-1].mode
 						& ATTR_WRAP)) {
 					break;
 				}
@@ -624,13 +627,13 @@ getsel(void)
 		}
 
 		if (sel.type == SEL_RECTANGULAR) {
-			gp = &term.line[y][sel.nb.x];
+			gp = &TLINE(y)[sel.nb.x];
 			lastx = sel.ne.x;
 		} else {
-			gp = &term.line[y][sel.nb.y == y ? sel.nb.x : 0];
+			gp = &TLINE(y)[sel.nb.y == y ? sel.nb.x : 0];
 			lastx = (sel.ne.y == y) ? sel.ne.x : term.col-1;
 		}
-		last = &term.line[y][MIN(lastx, linelen-1)];
+		last = &TLINE(y)[MIN(lastx, linelen-1)];
 		while (last >= gp && last->u == ' ')
 			--last;
 
@@ -836,6 +839,9 @@ ttyread(void)
 	if (buflen > 0)
 		memmove(buf, buf + written, buflen);
 
+	if (term.scr > 0 && term.scr < HISTSIZE-1)
+		term.scr++;
+
 	return ret;
 }
 
@@ -843,6 +849,9 @@ void
 ttywrite(const char *s, size_t n, int may_echo)
 {
 	const char *next;
+	Arg arg = (Arg) { .i = term.scr };
+
+	kscrolldown(&arg);
 
 	if (may_echo && IS_SET(MODE_ECHO))
 		twrite(s, n, 1);
@@ -1054,13 +1063,54 @@ tswapscreen(void)
 }
 
 void
-tscrolldown(int orig, int n)
+kscrolldown(const Arg* a)
+{
+	int n = a->i;
+
+	if (n < 0)
+		n = term.row + n;
+
+	if (n > term.scr)
+		n = term.scr;
+
+	if (term.scr > 0) {
+		term.scr -= n;
+		selscroll(0, -n);
+		tfulldirt();
+	}
+}
+
+void
+kscrollup(const Arg* a)
+{
+	int n = a->i;
+
+	if (n < 0)
+		n = term.row + n;
+
+	if (term.scr <= HISTSIZE-n) {
+		term.scr += n;
+		selscroll(0, n);
+		tfulldirt();
+	}
+}
+
+
+void
+tscrolldown(int orig, int n, int copyhist)
 {
 	int i;
 	Line temp;
 
 	LIMIT(n, 0, term.bot-orig+1);
 
+	if (copyhist) {
+		term.histi = (term.histi - 1 + HISTSIZE) % HISTSIZE;
+		temp = term.hist[term.histi];
+		term.hist[term.histi] = term.line[term.bot];
+		term.line[term.bot] = temp;
+	}
+
 	tsetdirt(orig, term.bot-n);
 	tclearregion(0, term.bot-n+1, term.col-1, term.bot);
 
@@ -1074,13 +1124,20 @@ tscrolldown(int orig, int n)
 }
 
 void
-tscrollup(int orig, int n)
+tscrollup(int orig, int n, int copyhist)
 {
 	int i;
 	Line temp;
 
 	LIMIT(n, 0, term.bot-orig+1);
 
+	if (copyhist) {
+		term.histi = (term.histi + 1) % HISTSIZE;
+		temp = term.hist[term.histi];
+		term.hist[term.histi] = term.line[orig];
+		term.line[orig] = temp;
+	}
+
 	tclearregion(0, orig, term.col-1, orig+n-1);
 	tsetdirt(orig+n, term.bot);
 
@@ -1129,7 +1186,7 @@ tnewline(int first_col)
 	int y = term.c.y;
 
 	if (y == term.bot) {
-		tscrollup(term.top, 1);
+		tscrollup(term.top, 1, 1);
 	} else {
 		y++;
 	}
@@ -1294,14 +1351,14 @@ void
 tinsertblankline(int n)
 {
 	if (BETWEEN(term.c.y, term.top, term.bot))
-		tscrolldown(term.c.y, n);
+		tscrolldown(term.c.y, n, 0);
 }
 
 void
 tdeleteline(int n)
 {
 	if (BETWEEN(term.c.y, term.top, term.bot))
-		tscrollup(term.c.y, n);
+		tscrollup(term.c.y, n, 0);
 }
 
 int32_t
@@ -1730,11 +1787,11 @@ csihandle(void)
 		break;
 	case 'S': /* SU -- Scroll <n> line up */
 		DEFAULT(csiescseq.arg[0], 1);
-		tscrollup(term.top, csiescseq.arg[0]);
+		tscrollup(term.top, csiescseq.arg[0], 0);
 		break;
 	case 'T': /* SD -- Scroll <n> line down */
 		DEFAULT(csiescseq.arg[0], 1);
-		tscrolldown(term.top, csiescseq.arg[0]);
+		tscrolldown(term.top, csiescseq.arg[0], 0);
 		break;
 	case 'L': /* IL -- Insert <n> blank lines */
 		DEFAULT(csiescseq.arg[0], 1);
@@ -2258,7 +2315,7 @@ eschandle(uchar ascii)
 		return 0;
 	case 'D': /* IND -- Linefeed */
 		if (term.c.y == term.bot) {
-			tscrollup(term.top, 1);
+			tscrollup(term.top, 1, 1);
 		} else {
 			tmoveto(term.c.x, term.c.y+1);
 		}
@@ -2271,7 +2328,7 @@ eschandle(uchar ascii)
 		break;
 	case 'M': /* RI -- Reverse index */
 		if (term.c.y == term.top) {
-			tscrolldown(term.top, 1);
+			tscrolldown(term.top, 1, 1);
 		} else {
 			tmoveto(term.c.x, term.c.y-1);
 		}
@@ -2490,7 +2547,7 @@ twrite(const char *buf, int buflen, int show_ctrl)
 void
 tresize(int col, int row)
 {
-	int i;
+	int i, j;
 	int minrow = MIN(row, term.row);
 	int mincol = MIN(col, term.col);
 	int *bp;
@@ -2527,7 +2584,15 @@ tresize(int col, int row)
 	term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
 	term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
 
-	/* resize each row to new width, zero-pad if needed */
+	for (i = 0; i < HISTSIZE; i++) {
+		term.hist[i] = xrealloc(term.hist[i], col * sizeof(Glyph));
+		for (j = mincol; j < col; j++) {
+			term.hist[i][j] = term.c.attr;
+			term.hist[i][j].u = ' ';
+		}
+	}
+
+	/* resize each r w to new width, zero-pad if needed */
 	for (i = 0; i < minrow; i++) {
 		term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
 		term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
@@ -2584,7 +2649,7 @@ drawregion(int x1, int y1, int x2, int y2)
 			continue;
 
 		term.dirty[y] = 0;
-		xdrawline(term.line[y], x1, y, x2);
+		xdrawline(TLINE(y), x1, y, x2);
 	}
 }
 
@@ -2605,8 +2670,10 @@ draw(void)
 		cx--;
 
 	drawregion(0, 0, term.col, term.row);
-	xdrawcursor(cx, term.c.y, term.line[term.c.y][cx],
-			term.ocx, term.ocy, term.line[term.ocy][term.ocx]);
+	if (term.scr == 0) {
+		xdrawcursor(cx, term.c.y, term.line[term.c.y][cx],
+				term.ocx, term.ocy, term.line[term.ocy][term.ocx]);
+	}
 	term.ocx = cx, term.ocy = term.c.y;
 	xfinishdraw();
 }
diff --git a/st.h b/st.h
index dac64d8..a2f8335 100644
--- a/st.h
+++ b/st.h
@@ -3,6 +3,9 @@
 #include <stdint.h>
 #include <sys/types.h>
 
+/* Arbitrary size */
+#define HISTSIZE      2000
+
 /* macros */
 #define MIN(a, b)		((a) < (b) ? (a) : (b))
 #define MAX(a, b)		((a) < (b) ? (b) : (a))
@@ -19,6 +22,8 @@
 
 #define TRUECOLOR(r,g,b)	(1 << 24 | (r) << 16 | (g) << 8 | (b))
 #define IS_TRUECOL(x)		(1 << 24 & (x))
+#define TLINE(y)       ((y) < term.scr ? term.hist[((y) + term.histi - term.scr \
+               + HISTSIZE + 1) % HISTSIZE] : term.line[(y) - term.scr])
 
 enum glyph_attribute {
 	ATTR_NULL       = 0,
@@ -111,6 +116,9 @@ void *xmalloc(size_t);
 void *xrealloc(void *, size_t);
 char *xstrdup(char *);
 
+void kscrolldown(const Arg *);
+void kscrollup(const Arg *);
+
 /* config.h globals */
 extern char *utmp;
 extern char *stty_args;
@@ -118,6 +126,7 @@ extern char *vtiden;
 extern char *worddelimiters;
 extern int allowaltscreen;
 extern char *termname;
+extern unsigned int alpha;
 extern unsigned int tabspaces;
 extern unsigned int defaultfg;
 extern unsigned int defaultbg;
diff --git a/win.h b/win.h
index 31f327d..d277477 100644
--- a/win.h
+++ b/win.h
@@ -23,6 +23,10 @@ enum win_mode {
 	                  |MODE_MOUSEMANY,
 };
 
+/* alpha */
+#define OPAQUE 0Xff
+#define USE_ARGB (alpha != OPAQUE && opt_embed == NULL)
+
 void xbell(void);
 void xclipcopy(void);
 void xdrawcursor(int, int, Glyph, int, int, Glyph);
diff --git a/x.c b/x.c
index c0bd890..8ced567 100644
--- a/x.c
+++ b/x.c
@@ -98,6 +98,7 @@ 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;
@@ -686,7 +687,7 @@ 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);
 
@@ -746,6 +747,12 @@ xloadcols(void)
 			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;
+		dc.col[defaultbg].pixel &= 0x00111111;
+		dc.col[defaultbg].pixel |= alpha << 24;
+	}
 	loaded = 1;
 }
 
@@ -767,6 +774,17 @@ xsetcolorname(int x, const char *name)
 	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 * win.cw,
+			borderpx + row1 * win.ch,
+			(col2-col1+1) * win.cw,
+			(row2-row1+1) * win.ch);
+}
+
 /*
  * Absolute coordinates.
  */
@@ -1004,7 +1022,40 @@ xinit(int cols, int rows)
 	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())
@@ -1014,7 +1065,11 @@ xinit(int cols, int rows)
 	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 */
@@ -1037,16 +1092,15 @@ xinit(int cols, int rows)
 	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, (USE_ARGB) ? xw.buf: parent,
+			GCGraphicsExposures, &gcvalues);
 	XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
 	XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, win.w, win.h);