Rework the compositor so it stops repainting the whole screen every frame,
tripling the frame rate (17 -> 54 FPS at HD) and adding smooth animation.
- Scene-dirty skipping (gui/gui_desktop.c): the full scene is recomposited only
when something other than the bare pointer changed -- input, an open animation,
or a ~10 Hz heartbeat for live content (clock, graphs). Idle and pointer-only
frames skip the recomposite entirely.
- Cursor save-under (gui/gui_cursor.c): the pointer is an overlay that stashes
and restores the pixels beneath it, so moving the mouse never forces a full
repaint -- pointer motion runs at the frame cap.
- 60 FPS frame pacer: each iteration is timed against the monotonic clock and
padded to a 16.666 ms budget with the new ktime_delay_us() (HPET-precise
busy-wait), giving consistent pacing instead of a free-running spin.
- Window open animation (gui/gui_wm.c): new windows grow from 60% to full size
with a cubic ease-out over ~160 ms; gui_wm_update() drives it and reports
while any window is still animating so the compositor keeps redrawing.
- Default display mode set to 1280x720 (HD) -- the sweet spot where the
software compositor sustains a near-60 FPS cursor with headroom for effects.
Kernel: kernel/time/ktime.c gains ktime_delay_us(), a precise HPET-based delay
(bounded PIT fallback) used by the pacer.
Verified live (screenshotted): boots to 1280x720, logs in, tray reads ~54 FPS
(green) while the pointer moves, no cursor ghosting, windows render cleanly.
Clean build on x86_64/aarch64/armv8i; 0 panics / 0 OOM.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Fh5z6V7nGPbHvqVG5p4CXX
GUI polish / HD:
- Default display mode raised to 1920x1080 (video=1920x1080); make run/vnc use
vgamem_mb=64 and -m 512M. The growable heap absorbs the larger backbuffer,
shadow and wallpaper (observed: one 16 MB growth to a 48 MB heap).
- Wallpaper: three-stop vertical gradient, a soft concentric-frame edge vignette
for depth, a finer faint grid, and a centred brand mark.
- Window chrome: brighter/saturated titlebar gradient when focused, an accent
underline on the active window, and larger/softer drop shadows.
- Default session windows are placed and sized for the HD work area.
- Live FPS pill in the taskbar tray (green/amber/red by rate); tray widened so
FPS + CPU trace + memory badge + clock no longer overlap.
Kernel:
- kernel/time/ktime.c + include/kernel/ktime.h (new): a unified monotonic
high-resolution clock that prefers the HPET (nanosecond) and falls back to the
100 Hz PIT tick. Wired ktime_init() into boot; drives the compositor's FPS
sampling. New `ktime` LazyBox applet reports the source and uptime.
Verified live (screenshotted): boots to 1920x1080, KTIME reports
"source: HPET, nanosecond resolution", the polished desktop renders with the
active-window accent and vignette, and the tray shows a live FPS reading.
Clean build on x86_64/aarch64/armv8i; 0 panics / 0 OOM.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Fh5z6V7nGPbHvqVG5p4CXX
