Adding fixes to renderer

tests/test_end_marker.py

@@ -0,0 +1,58 @@
+"""[end:handle] explicit end markers: a video started with end_on=end_marker
+stops at the first [end:handle] placed after it."""
+import sys
+from pathlib import Path
+
+sys.path.insert(0, str(Path(__file__).resolve().parent.parent))
+
+from gnommo.transformer import _extract_video_events, MarkerTiming
+from gnommo.models import VideoSource, CutoutDefinition
+
+
+def check(name, cond):
+    print(f"  {'PASS' if cond else 'FAIL'}  {name}")
+    assert cond, name
+
+
+VIDEOS = {"fart": VideoSource(source_file="fart.mp4", cutout="fullscreen", layer="below")}
+CUTOUTS = {"fullscreen": CutoutDefinition(x=0, y=0, height=1080, width=1920)}
+
+
+def mt(mid, t, ov=None):
+    return MarkerTiming(mid, t, "text", 1.0, ov)
+
+
+# 1. [vfb:fart, end_on=end_marker] @10 ; [end:fart] @25  → ends at 25
+events, warns = _extract_video_events(
+    [mt("vfb:fart", 10.0, {"end_on": "end_marker"}), mt("end:fart", 25.0)],
+    VIDEOS, CUTOUTS, {}, 100.0,
+)
+check("[end:fart] is not itself a video event", len(events) == 1)
+check("video starts at 10.0", abs(events[0].start_time - 10.0) < 1e-6)
+check("video ends at the [end:fart] marker (25.0)", abs(events[0].end_time - 25.0) < 1e-6)
+check("no warnings", not warns)
+
+# 2. earliest [end:fart] AFTER the start wins; an earlier one is ignored (reuse handle)
+events2, _ = _extract_video_events(
+    [
+        mt("end:fart", 5.0),                              # before start → ignored
+        mt("vfb:fart", 10.0, {"end_on": "end_marker"}),
+        mt("end:fart", 20.0),                             # first after start
+        mt("end:fart", 40.0),
+    ],
+    VIDEOS, CUTOUTS, {}, 100.0,
+)
+check("uses first end marker after start (20.0)", abs(events2[0].end_time - 20.0) < 1e-6)
+
+# 3. fallback: end_on=end_marker but no [end:fart] → next video + warning
+videos3 = {**VIDEOS, "other": VideoSource(source_file="o.mp4", cutout="square")}
+cutouts3 = {**CUTOUTS, "square": CutoutDefinition(x=0, y=0, height=864, width=864)}
+events3, warns3 = _extract_video_events(
+    [mt("vfb:fart", 10.0, {"end_on": "end_marker"}), mt("vst:other", 30.0)],
+    videos3, cutouts3, {}, 100.0,
+)
+fart_ev = next(e for e in events3 if e.video_id == "fart")
+check("fallback ends at next video (30.0)", abs(fart_ev.end_time - 30.0) < 1e-6)
+check("warns about the missing [end:fart]", any("end_on=end_marker" in w for w in warns3))
+
+print("\nAll [end:handle] tests passed.")

tests/test_fit_filter.py

@@ -0,0 +1,42 @@
+"""CSS-like cutout placement: object-fit (cover/contain) + object-position."""
+import sys
+from pathlib import Path
+
+sys.path.insert(0, str(Path(__file__).resolve().parent.parent))
+
+from gnommo.renderer import _fit_filter
+
+
+def check(name, cond):
+    print(f"  {'PASS' if cond else 'FAIL'}  {name}")
+    assert cond, name
+
+
+# Defaults reproduce the long-standing cover+center string exactly (no render churn).
+check(
+    "cover/center == legacy scale+crop",
+    _fit_filter(864, 864, 1.0, "cover", "center")
+    == "scale=864:864:force_original_aspect_ratio=increase,crop=864:864:(iw-864)/2:(ih-864)/2",
+)
+check(
+    "cover applies zoom",
+    _fit_filter(864, 864, 1.5, "cover", "center").startswith("scale=1296:1296:"),
+)
+
+# cover anchors the crop by position.
+check("cover/top crops from bottom (y=0)", ":(iw-864)/2:0" in _fit_filter(864, 864, 1.0, "cover", "top"))
+check("cover/bottom (y=ih-H)", ":(iw-864)/2:(ih-864)" in _fit_filter(864, 864, 1.0, "cover", "bottom"))
+check("cover/left (x=0)", "crop=864:864:0:(ih-864)/2" in _fit_filter(864, 864, 1.0, "cover", "left"))
+check("cover/right (x=iw-W)", "crop=864:864:(iw-864):(ih-864)/2" in _fit_filter(864, 864, 1.0, "cover", "right"))
+
+# contain shrinks to fit and pads; position places the padded video.
+check(
+    "contain/top fits inside, pads to top",
+    _fit_filter(864, 864, 1.0, "contain", "top")
+    == "scale=864:864:force_original_aspect_ratio=decrease,pad=864:864:(ow-iw)/2:0:color=0x00000000",
+)
+check("contain ignores zoom", "scale=864:864:" in _fit_filter(864, 864, 2.0, "contain", "center"))
+check("contain/bottom pads to bottom", ":(ow-iw)/2:(oh-ih):" in _fit_filter(864, 864, 1.0, "contain", "bottom"))
+check("contain/left pads to left", "pad=864:864:0:(oh-ih)/2" in _fit_filter(864, 864, 1.0, "contain", "left"))
+
+print("\nAll object-fit/object-position tests passed.")