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M4 (task ot0): fullscreen + slideshow + info overlay.
- src/info.{c,h}: plain-C EXIF gather via libexif (camera, lens, focal,
aperture, shutter, ISO, datetime, orientation) + file info (dims, format,
size). info_format() produces the overlay text. Unit-tested.
- src/window.c: fullscreen toggle (f), slideshow (S, 3s auto-advance), info
overlay (i, GtkLabel in GtkOverlay, auto-hide 5s), Esc contextual back
(fullscreen→unfullscreen→large→grid→quit). Stack wrapped in GtkOverlay.
ggaze_window_get_stack() accessor for tests.
- src/shortcuts.c: f, S, i, Escape bindings.
- meson.build: libexif dep added.
- tests: unit test_info (EXIF extraction + orientation tag). 14/14 green,
ASan clean.
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M3 (task it0): responsive + prefetch.
- src/loader/loader.{c,h}: loader_load_async/_finish wrap the sync
loader_load in a GTask worker; the task's source object is the GFile so the
finish callback can check it against navigator.current (last-write-wins).
- src/texturecache.{c,h}: bounded LRU (cap 4) of GFile->GdkTexture, hash+GQueue
O(1) get/put, entry owns the key (no double-unref), evicts LRU on overflow.
- src/window.c: async visible load (cancel-then-recreate single GCancellable);
cache hit -> show+prefetch, miss -> async load; last-write-wins guard
(g_file_equal(current, loaded)) before showing; prefetch next/prev into the
cache via a separate prefetch cancellable (cancelled each round). Finish
callbacks hold a ref on the window (released in the callback) so they never
deref a freed window; dispose cancels both cancellables.
- tests: unit test_texturecache (LRU evict/order/replace/miss), integration
test_responsive_nav (10 rapid next -> last-write-wins). M1/M2 tests updated
to pump the main loop (loads are now async) + drain_main before exit.
- meson: texturecache in libggae; GIO_USE_VFS=local in fixtures_env.
Fixed: texturecache double-unref (key ownership), async-callback UAF (window
ref in callback data + drain in tests), a test g_build_filename leak. Sub-agent
review issues addressed (dispose + cache-hit cancel in-flight loads).
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M1 (task gt0): show one image with zoom/pan.
- src/loader/detect.{c,h}: magic-byte format sniffing (JPEG/PNG/GIF/WebP/
TIFF/ICO/JXL/AVIF/HEIF) -> GgazeFormat; pure, no I/O, unit-testable.
- src/loader/loader.{c,h}: loader_load() sniffs the header and dispatches to
the first registered backend; GgazeLoaderBackend struct; pixbuf is the
fallback (last, accepts UNKNOWN). M1 ships only the pixbuf backend.
- src/loader/backends/pixbuf.c: GdkPixbufLoader decode +
gdk_pixbuf_apply_embedded_orientation (decision #26) -> GdkTexture via
gdk_memory_texture_new (avoids the deprecated gdk_texture_new_for_pixbuf).
- src/viewer.{c,h}: GgazeViewer : GtkWidget custom widget (decision #31) —
fit/100%/in/out zoom, cursor-centered zoom, drag-to-pan with clamping,
dark background, GtkSnapshot render nodes.
- src/window.c: open -> loader_load -> viewer_set_texture -> stack 'large'.
- tests: unit test_detect (13 cases) + test_loader_pixbuf (plain/rotated-EXIF
8x4 orient6->4x8/png/rgba/missing/unsupported jxl-avif-heif/corrupt),
integration test_open_and_show (fixture + rotated + ./sample-images
skip-if-absent). 6/6 green; detect 97% / loader 91% / pixbuf 87% coverage.
- fixtures: gen.py produces plain.jpg, rot6.jpg, small.png, rgba.png.
- AGENTS.md: documents the ./sample-images optional test corpus convention.
Sub-agent review fixes: use-after-free of c_name in ggaze_window_open
(BLOCKER), gtk_stack_get_pages leak in test_window (BLOCKER), coverage gap,
dead branch, viewer measure, _prefix/_cb naming, include order, extern in
header, pan clamp, stale comments — all addressed.
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