Image regress tests.

regress/image-resize-width-recovery.sh

@@ -0,0 +1,46 @@
+#!/bin/sh
+
+# The PR's SIXEL fixture must recover all columns clipped at placement time.
+# A PTY gives a known cell size; allow restored rows to use several rasters.
+
+PATH=/bin:/usr/bin
+TERM=screen
+export TERM
+[ -z "$TEST_TMUX" ] && TEST_TMUX=$(readlink -f ../tmux)
+
+python3 -B - "$TEST_TMUX" <<'PY'
+from pathlib import Path
+import re
+import sys
+from image_test import image_test
+
+wire = Path('monkey-2.sixel.txt').read_bytes()
+match = re.search(rb'"1;1;(\d+);(\d+)', wire)
+assert match is not None
+w, h = map(int, match.groups())
+
+with image_test(sys.argv[1], sx=12, sy=40) as test:
+    client = test.attach()
+    test.emit(wire)
+    test.redraw()
+    images = client.images()
+    assert len(images) == 1, [im[:2] for im in images]
+    assert images[0][:2] == (96, h), images[0][:2]
+
+    test.resize(client, 80, 40)
+    test.redraw()
+    images = client.images()
+    assert images, 'no image after widening'
+    x = y = 0
+    row_h = None
+    for im in images:
+        if x == 0:
+            row_h = im[1]
+        assert im[1] == row_h, (im[:2], row_h)
+        x += im[0]
+        assert x <= w, (x, w)
+        if x == w:
+            y += row_h
+            x = 0
+    assert (x, y) == (0, h), ('image stayed clipped', x, y, w, h)
+PY