FAQ: add some details about the w3m img hack
... and an example patch to switch from double-buffering to a single buffer.
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Hiltjo Posthuma
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FAQ
59
FAQ
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@ -2,12 +2,14 @@
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Use the excellent tool of [utmp](https://git.suckless.org/utmp/) for this task.
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## Some _random program_ complains that st is unknown/not recognised/unsupported/whatever!
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It means that st doesn’t have any terminfo entry on your system. Chances are
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you did not `make install`. If you just want to test it without installing it,
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you can manually run `tic -sx st.info`.
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## Nothing works, and nothing is said about an unknown terminal!
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* Some programs just assume they’re running in xterm i.e. they don’t rely on
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@ -15,6 +17,7 @@ you can manually run `tic -sx st.info`.
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* Some programs don’t complain about the lacking st description and default to
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another terminal. In that case see the question about terminfo.
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## How do I scroll back up?
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* Using a terminal multiplexer.
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@ -23,11 +26,13 @@ you can manually run `tic -sx st.info`.
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* Using the excellent tool of [scroll](https://git.suckless.org/scroll/).
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* Using the scrollback [patch](https://st.suckless.org/patches/scrollback/).
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## I would like to have utmp and/or scroll functionality by default
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You can add the absolute patch of both programs in your config.h
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file. You only have to modify the value of utmp and scroll variables.
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## Why doesn't the Del key work in some programs?
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Taken from the terminfo manpage:
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@ -83,12 +88,14 @@ If you are using zsh, then read the zsh FAQ
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Putting these lines into your .zshrc will fix the problems.
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## How can I use meta in 8bit mode?
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St supports meta in 8bit mode, but the default terminfo entry doesn't
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use this capability. If you want it, you have to use the 'st-meta' value
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in TERM.
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## I cannot compile st in OpenBSD
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OpenBSD lacks librt, despite it being mandatory in POSIX
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@ -97,6 +104,7 @@ If you want to compile st for OpenBSD you have to remove -lrt from config.mk, an
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st will compile without any loss of functionality, because all the functions are
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included in libc on this platform.
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## The Backspace Case
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St is emulating the Linux way of handling backspace being delete and delete being
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@ -158,19 +166,60 @@ terminal users wants its backspace to be how he feels it:
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[1] http://www.ibb.net/~anne/keyboard.html
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[2] http://www.tldp.org/HOWTO/Keyboard-and-Console-HOWTO-5.html
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## But I really want the old grumpy behaviour of my terminal
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Apply [1].
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[1] https://st.suckless.org/patches/delkey
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## Why do images not work in st (in programs such as w3m)?
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This is a terrible hack that overdraws an image on top of the terminal emulator
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window. It also relies on a very specific way the terminal draws it's contents.
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## Why do images not work in st using the w3m image hack?
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w3mimg uses a hack that draws an image on top of the terminal emulator Drawable
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window. The hack relies on the terminal to use a single buffer to draw its
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contents directly.
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st uses double-buffered drawing so the image is quickly replaced and may show a
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short flicker effect.
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Below is a patch example to change st double-buffering to a single Drawable
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buffer.
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diff --git a/x.c b/x.c
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--- a/x.c
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+++ b/x.c
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@@ -561,10 +561,6 @@ xresize(int col, int row)
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win.tw = MAX(1, col * win.cw);
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win.th = MAX(1, row * win.ch);
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- XFreePixmap(xw.dpy, xw.buf);
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- xw.buf = XCreatePixmap(xw.dpy, xw.win, win.w, win.h,
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- DefaultDepth(xw.dpy, xw.scr));
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- XftDrawChange(xw.draw, xw.buf);
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xclear(0, 0, win.w, win.h);
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}
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@@ -921,8 +917,7 @@ xinit(void)
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gcvalues.graphics_exposures = False;
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dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
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&gcvalues);
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- xw.buf = XCreatePixmap(xw.dpy, xw.win, win.w, win.h,
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- DefaultDepth(xw.dpy, xw.scr));
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+ xw.buf = xw.win;
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XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
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XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, win.w, win.h);
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@@ -1386,8 +1381,6 @@ void
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draw(void)
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{
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drawregion(0, 0, term.col, term.row);
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- XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, win.w,
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- win.h, 0, 0);
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XSetForeground(xw.dpy, dc.gc,
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dc.col[IS_SET(MODE_REVERSE)?
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defaultfg : defaultbg].pixel);
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A more proper (but limited way) would be using sixels. Which st doesn't
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support.
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## BadLength X error in Xft when trying to render emoji
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