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FAQ: add some details about the w3m img hack - st - simple terminal
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---
commit 0f8b40652bca0670f1f0bda069bbc55f8b5e364d
parent e6e2c6199f102f1459b53717050eee27832f4f87
Author: Hiltjo Posthuma <[email protected]>
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:
M FAQ | 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/unsupport…
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 …
@@ -15,6 +17,7 @@ you can manually run `tic -sx st.info`.
* Some programs don’t complain about the lacking st description and default …
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 -lr…
st will compile without any loss of functionality, because all the functions a…
included in libc on this platform.
+
## The Backspace Case
St is emulating the Linux way of handling backspace being delete and delete be…
@@ -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
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