Files
tmux/regress/image-sixel-parse.sh
Nicholas Marriott 8856c1e669 Merge image_merge into 4902-image-support
Keep retained indexed SIXEL data and the bounded per-terminal output cache.
Use the cleaned-up decoder and RGBA encoder from image_merge, including
parser memory limits, pixel-size handling and references for pending output.
Match retained SIXEL scaling to the shared image cell footprint and emit
black definitions for undefined colour registers.

Keep Kitty input, output, layers and placeholders. Adapt backend selection,
flags, drawing and cleanup to the callbacks and Iscrl capability. Keep the
pane-status repaint with the requested XXX comment.

Replace the elaborate fallback with image_merge's implementation, removing
its caches, sample structures, quadrant/sextant features and ACS additions.
Keep the image_merge regressions and adapt the Kitty tests to the simpler
fallback. Use skip status 101 and disable Python bytecode for image tests.

Small changes still outside image_merge:
- Guard zero-height synchronized redraws before bit_nset.
- Select the image backend when the tty opens.
- Enable imagescroll by default for Kitty and Ghostty.
- Keep the explanatory manual-window pixel-size comment (comment only).
- Keep the additional SIXEL fixtures and visual test tools.

Validation: image-enabled and disabled builds; 31 image and 13 related
regressions pass normally and under ASAN. All image tests skip without
images. Focused palette, parser, scaling, transparency and Kitty layer
tests also pass after the retained-output adjustments. Diff checks clean.
2026-10-14 14:28:22 +01:00

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#!/bin/sh
# Valid, fragmented and rejected SIXEL input, including the PR's stray
# character case and limits reached while growing the image.
PATH=/bin:/usr/bin
TERM=screen
export TERM
[ -z "$TEST_TMUX" ] && TEST_TMUX=$(readlink -f ../tmux)
python3 -B - "$TEST_TMUX" <<'PY'
import sys
from image_test import image_test, sixel, check_image
with image_test(sys.argv[1]) as test:
client = test.attach()
red = (255, 0, 0)
valid = sixel(8, 16, [(100, 0, 0)], [0] * (8 * 16))
# Check a clean image and the same one with stray bytes between bands.
for wire in (valid, valid.replace(b'-', b' \t\177\200-', 1)):
test.emit(b'\033[2J\033[H' + wire)
images = client.images()
assert len(images) == 1, len(images)
check_image(images[0], 8, 16, [red] * (8 * 16))
# HLS uses blue at 0, red at 120 and green at 240 degrees.
for hue, rgb in [(0, (0, 0, 255)), (120, red), (240, (0, 255, 0))]:
wire = ('\033P9;1q"1;1;8;16#0;1;%d;50;100'
'#0!8~-!8~-!8N\033\\' % hue).encode()
test.emit(b'\033[2J\033[H' + wire)
assert len(client.images()) == 1
check_image(client.images()[0], 8, 16, [rgb] * (8 * 16))
# Undefined registers are black in the shared model and in retained output.
test.emit(b'\033[2J\033[H\033P9;1q"1;1;8;16'
b'#5!8~-!8~-!8N\033\\')
assert len(client.images()) == 1
check_image(client.images()[0], 8, 16, [(0, 0, 0)] * (8 * 16))
test.redraw()
check_image(client.images()[0], 8, 16, [(0, 0, 0)] * (8 * 16))
# Deliver the terminator in two pieces. No image is placed before it.
test.emit(b'\033[2J\033[H')
for byte in valid[:-1]:
test.send(bytes([byte]))
client.read()
assert not client.images(), 'image placed before the DCS terminator'
assert test.run('display-message', '-p', '#{cursor_y}') == '0'
test.emit(valid[-1:])
assert len(client.images()) == 1
check_image(client.images()[0], 8, 16, [red] * (8 * 16))
rejected = [
b'q', b'q#0;2;100', b'q!0~', b'q!10001~', b'q#1025~',
b'q#0;2;101;0;0~', b'q#0;1;361;50;100~',
b'q"1;1;10001;1', b'q"1;1;1;10001',
b'q"1;1;4096;4097',
b'q"1;1;18446744073709551616;1',
b'q"1;1;10000;1#0;2;100;0;0@' + b'-' * 300 + b'@',
b'q"1;1;1;10000#0;2;100;0;0!2000@',
]
for body in rejected:
test.emit(b'\033[2J\033[H\033P9;1' + body + b'\033\\')
assert not client.images(), ('invalid image accepted', body[:80])
assert test.run('display-message', '-p', '#{cursor_x},#{cursor_y}') == '0,0'
test.redraw()
assert not client.images(), ('invalid image retained', body[:80])
PY