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Fix SIXEL median-cut palette generation

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This commit is contained in:
Michael Grant
2026-08-05 21:44:25 +01:00
parent c0ab9b7b3f
commit 8b44703b41
2 changed files with 23 additions and 2 deletions
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3
image-sixel.c
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@@ -877,6 +877,9 @@ sixel_box_split(struct sixel_box *box, struct sixel_box *new,
if (count >= box->count / 2)
break;
}
/* Keep the maximum occupied level in the new box. */
if (level == last)
level--;
memcpy(new, box, sizeof *new);
if (channel == 0) {
box->red_max = level;

22
regress/image-support.sh
View File

@@ -125,7 +125,7 @@ $TMUX2 select-window -t:1 || exit 1
sleep 1
[ "$($TMUX2 display-message -p '#{cursor_x},#{cursor_y}')" = "2,1" ] || exit 1
$TMUX capture-pane -pS0 -E3 >$TMP || exit 1
[ "$(sed -n 3p $TMP)" = " :" ] || exit 1
[ "$(sed -n 3p $TMP)" = " -" ] || exit 1
[ "$(sed -n 4p $TMP)" = " *" ] || exit 1
# With normal cursor movement, scrolling is calculated from the full image
@@ -139,7 +139,7 @@ $TMUX2 select-window -t:2 || exit 1
sleep 1
[ "$($TMUX2 display-message -p '#{cursor_y}')" = 3 ] || exit 1
$TMUX capture-pane -pS0 -E3 >$TMP || exit 1
[ "$(sed -n 1p $TMP)" = ":" ] || exit 1
[ "$(sed -n 1p $TMP)" = "-" ] || exit 1
[ "$(sed -n 2p $TMP)" = "*" ] || exit 1
[ "$(sed -n 3p $TMP)" = "@" ] || exit 1
@@ -181,4 +181,22 @@ $TMUX capture-pane -pS0 -E3 >$TMP || exit 1
[ "$(sed -n 1p $TMP | wc -c)" = 61 ] || exit 1
[ -z "$(sed -n 2p $TMP)" ] || exit 1
# A weighted median at the maximum channel level must still leave colours on
# both sides of the split. This skewed black, grey and white image used to stop
# palette generation after one colour instead of producing three.
$TMUX kill-server 2>/dev/null
$TMUX2 kill-server 2>/dev/null
$TMUX2 new-session -d -x 20 -y 4 "
printf '\033_Ga=T,q=2,C=1,f=24,s=100,v=1,c=10,r=1;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICA////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////\033\\'
sleep 10" || exit 1
$TMUX2 set -g status off || exit 1
$TMUX2 set -as terminal-features ',*:sixel' || exit 1
$TMUX new-session -d -x 20 -y 4 || exit 1
$TMUX set -g status off || exit 1
$TMUX pipe-pane -O "cat >$TMP" || exit 1
$TMUX send-keys -l "$TMUX2 attach-session" || exit 1
$TMUX send-keys Enter || exit 1
sleep 1
grep -a '#2;2;' $TMP >/dev/null || exit 1
exit 0