# st

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    commit 0f8b40652bca0670f1f0bda069bbc55f8b5e364d
    parent e6e2c6199f102f1459b53717050eee27832f4f87
    Author: Hiltjo Posthuma <hiltjo@codemadness.org>
    Date:   Sat, 30 May 2020 21:50:54 +0200

    FAQ: add some details about the w3m img hack

    ... and an example patch to switch from double-buffering to a single buffer.

    Diffstat:
    MFAQ | 59++++++++++++++++++++++++++++++++++++++++++++++++++++++-----

    1 file changed, 54 insertions(+), 5 deletions(-)
    diff --git a/FAQ b/FAQ
    @@ -2,12 +2,14 @@

     Use the excellent tool of [utmp](https://git.suckless.org/utmp/) for this task.

    +
     ## Some _random program_ complains that st is unknown/not recognised/unsupported/whatever!

     It means that st doesn’t have any terminfo entry on your system. Chances are
     you did not `make install`. If you just want to test it without installing it,
     you can manually run `tic -sx st.info`.

    +
     ## Nothing works, and nothing is said about an unknown terminal!

     * Some programs just assume they’re running in xterm i.e. they don’t rely on
    @@ -15,6 +17,7 @@ you can manually run `tic -sx st.info`.
     * Some programs don’t complain about the lacking st description and default to
       another terminal. In that case see the question about terminfo.

    +
     ## How do I scroll back up?

     * Using a terminal multiplexer.
    @@ -23,11 +26,13 @@ you can manually run `tic -sx st.info`.
     * Using the excellent tool of [scroll](https://git.suckless.org/scroll/).
     * Using the scrollback [patch](https://st.suckless.org/patches/scrollback/).

    +
     ## I would like to have utmp and/or scroll functionality by default

     You can add the absolute patch of both programs in your config.h
     file. You only have to modify the value of utmp and scroll variables.

    +
     ## Why doesn't the Del key work in some programs?

     Taken from the terminfo manpage:
    @@ -83,12 +88,14 @@ If you are using zsh, then read the zsh FAQ

     Putting these lines into your .zshrc will fix the problems.

    +
     ## How can I use meta in 8bit mode?

     St supports meta in 8bit mode, but the default terminfo entry doesn't
     use this capability. If you want it, you have to use the 'st-meta' value
     in TERM.

    +
     ## I cannot compile st in OpenBSD

     OpenBSD lacks librt, despite it being mandatory in POSIX
    @@ -97,6 +104,7 @@ If you want to compile st for OpenBSD you have to remove -lrt from config.mk, an
     st will compile without any loss of functionality, because all the functions are
     included in libc on this platform.

    +
     ## The Backspace Case

     St is emulating the Linux way of handling backspace being delete and delete being
    @@ -158,19 +166,60 @@ terminal users wants its backspace to be how he feels it:
     	[1] http://www.ibb.net/~anne/keyboard.html
     	[2] http://www.tldp.org/HOWTO/Keyboard-and-Console-HOWTO-5.html

    +
     ## But I really want the old grumpy behaviour of my terminal

     Apply [1].

     [1] https://st.suckless.org/patches/delkey

    -## Why do images not work in st (in programs such as w3m)?

    -This is a terrible hack that overdraws an image on top of the terminal emulator
    -window. It also relies on a very specific way the terminal draws it's contents.
    +## Why do images not work in st using the w3m image hack?
    +
    +w3mimg uses a hack that draws an image on top of the terminal emulator Drawable
    +window. The hack relies on the terminal to use a single buffer to draw its
    +contents directly.
    +
    +st uses double-buffered drawing so the image is quickly replaced and may show a
    +short flicker effect.
    +
    +Below is a patch example to change st double-buffering to a single Drawable
    +buffer.
    +
    +diff --git a/x.c b/x.c
    +--- a/x.c
    ++++ b/x.c
    +@@ -561,10 +561,6 @@ xresize(int col, int row)
    + 	win.tw = MAX(1, col * win.cw);
    + 	win.th = MAX(1, row * win.ch);
    +
    +-	XFreePixmap(xw.dpy, xw.buf);
    +-	xw.buf = XCreatePixmap(xw.dpy, xw.win, win.w, win.h,
    +-			DefaultDepth(xw.dpy, xw.scr));
    +-	XftDrawChange(xw.draw, xw.buf);
    + 	xclear(0, 0, win.w, win.h);
    + }
    +
    +@@ -921,8 +917,7 @@ xinit(void)
    + 	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 = xw.win;
    + 	XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
    + 	XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, win.w, win.h);
    +
    +@@ -1386,8 +1381,6 @@ void
    + draw(void)
    + {
    + 	drawregion(0, 0, term.col, term.row);
    +-	XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, win.w,
    +-			win.h, 0, 0);
    + 	XSetForeground(xw.dpy, dc.gc,
    + 			dc.col[IS_SET(MODE_REVERSE)?
    + 				defaultfg : defaultbg].pixel);

    -A more proper (but limited way) would be using sixels. Which st doesn't
    -support.

     ## BadLength X error in Xft when trying to render emoji