diff options
| author | Jiri Slaby (SUSE) <jirislaby@kernel.org> | 2024-02-02 07:55:47 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-02-06 14:37:37 +0000 |
| commit | fb8fa9093a4d2b5be4516a66c64b10cc35458333 (patch) | |
| tree | 96564f9d8276cbf494a88a6674c039fc98e1b1cf /drivers/tty | |
| parent | f60ce0e4bbf385a938e89b6dcead1eea89b83741 (diff) | |
| download | linux-fb8fa9093a4d2b5be4516a66c64b10cc35458333.tar.gz | |
tty: vt: make rgb_from_256() slighly more comprehensible
* make the parameter unsigned, as it is expected to be unsigned,
* make the computation easier to follow -- step-by-step, and
* don't use 85 / 2 which is only a reduced form of 255 / 6 (by a factor
3). Unlike the former, the latter can be understood.
Signed-off-by: "Jiri Slaby (SUSE)" <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20240202065608.14019-2-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/vt/vt.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c index 65cd40cac96bbc..7d42f148559ae4 100644 --- a/drivers/tty/vt/vt.c +++ b/drivers/tty/vt/vt.c @@ -1588,7 +1588,7 @@ static void default_attr(struct vc_data *vc) struct rgb { u8 r; u8 g; u8 b; }; -static void rgb_from_256(int i, struct rgb *c) +static void rgb_from_256(unsigned int i, struct rgb *c) { if (i < 8) { /* Standard colours. */ c->r = i&1 ? 0xaa : 0x00; @@ -1599,9 +1599,12 @@ static void rgb_from_256(int i, struct rgb *c) c->g = i&2 ? 0xff : 0x55; c->b = i&4 ? 0xff : 0x55; } else if (i < 232) { /* 6x6x6 colour cube. */ - c->r = (i - 16) / 36 * 85 / 2; - c->g = (i - 16) / 6 % 6 * 85 / 2; - c->b = (i - 16) % 6 * 85 / 2; + i -= 16; + c->b = i % 6 * 255 / 6; + i /= 6; + c->g = i % 6 * 255 / 6; + i /= 6; + c->r = i * 255 / 6; } else /* Grayscale ramp. */ c->r = c->g = c->b = i * 10 - 2312; } |