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readme: note that some terminals draw block chars directly

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nick black 4 years ago
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README.md
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@ -276,7 +276,7 @@ and background indices into said table. That'll work for the duration of a
porting effort, certainly. porting effort, certainly.
I have adapted two large (~5k lines of C UI code each) programs from NCURSES to I have adapted two large (~5k lines of C UI code each) programs from NCURSES to
notcurses, and found it a fairly painless process. It was helpful to introduce Notcurses, and found it a fairly painless process. It was helpful to introduce
a shim layer, e.g. `compat_mvwprintw` for NCURSES's `mvwprintw`: a shim layer, e.g. `compat_mvwprintw` for NCURSES's `mvwprintw`:
```c ```c
@ -326,21 +326,24 @@ These are pretty obvious, implementation-wise.
### TrueColor detection ### TrueColor detection
notcurses aims to use only information found in the terminal's terminfo entry to detect capabilities, TrueColor Notcurses primarily loads control sequences from `terminfo(5)`, using the
being one of them. Support for this is indicated by terminfo having a flag, added in NCURSES 6.1, named `RGB` set database entry specified by the `TERM` environment variable. 24-bit "TrueColor"
to `true`. However, as of today there are few and far between terminfo entries which have the capability in their color support (or at least the ability to specify 3 8-bit channels as arguments
database entry and so TrueColor won't be used in most cases. Terminal emulators have had for years a kludge to to `setaf` and `setbf`) is indicated by the `rgb` terminfo capability. Many
work around this limitation of terminfo in the form of the `COLORTERM` environment variable which, if set to either terminals with RGB support do not advertise the `rgb` capability. If you
`truecolor` or `24bit` does the job of indicating the capability of sending the escapes 48 and 38 together with a believe your terminal to support 24-bit TrueColor, this can be indicated by
tripartite RGB (0 ≤ c ≤ 255 for all three components) to specify fore- and background colors. exporting the `COLORTERM` environment variable as `truecolor` or `24bit`.
Checking for `COLORTERM` admittedly goes against the goal stated at the top of this section but, for all practical Note that some terminals accept a 24-bit specification, but map it down to
purposes, makes the detection work quite well **today**. fewer colors.
### Fonts ### Fonts
Fonts end up being a whole thing, little of which is pleasant. I'll write this Fonts end up being a whole thing, little of which is pleasant. I'll write this
up someday **FIXME**. up someday **FIXME**.
It is worth knowing that several terminals draw the block characters directly,
rather than loading them from a font.
### FAQs ### FAQs
If things break or seem otherwise lackluster, **please** consult the If things break or seem otherwise lackluster, **please** consult the

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