FAQ: add some details about the w3m img hack

... and an example patch to switch from double-buffering to a single buffer.
master
Hiltjo Posthuma 2020-05-30 21:50:54 +02:00
parent e6e2c6199f
commit 0f8b40652b
1 changed files with 54 additions and 5 deletions

59
FAQ
View File

@ -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 doesnt 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 theyre running in xterm i.e. they dont rely on
@ -15,6 +17,7 @@ you can manually run `tic -sx st.info`.
* Some programs dont 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