feature/PNG-Decoding-Support,Video Player,AVI-Decoding,Hostshare

[SXnell]

PNG decode pipeline

Added media_decode_png_buffer() with size/overflow checks and optional caller‑provided buffer support to match the JPEG API.
Switched PNG output to 0xAARRGGBB and preserved alpha per pixel; JPEG output now forces A=0xFF for consistency.
Added safeguards for oversized images in both PNG and JPEG paths.
Rendering + blending

Introduced a small alpha‑blend helper to composite PNG pixels onto the existing RGB framebuffer.
Applied blending in:
Image Viewer draw path (including scaled/rotated render)
Wallpaper rendering (blends PNG onto gradient background)
Wallpaper thumbnails in Settings
Dock icons (PNG RGBA arrays)
Image Viewer toolbar icons (RGBA arrays)
System assets / RAMFS seeding

Added wallpaper.png to the bootstrap asset generator.
Embedded wallpaper.png as a C asset and seeded wallpaper.png at boot.
Switched wallpaper selection to prefer wallpaper.png.
UI + UX

Terminal view command now accepts .png files (help text + validation).
README updated to document PNG support and decoder attribution.
Generated assets

Generated bootstrap_wallpaper_png.c.
Regenerated existing JPEG bootstrap assets as part of the asset pipeline run (if applicable).
Tested on M4 Mac, QEMU virt machine on ARM64 (Cortex‑A72), QEMU ramfb 1024x768

[SXnell]

[SXnell]

oops sorry, new to github!

[SXnell]

This PR adds a basic in-OS video playback experience (MJPEG-in-AVI, video-only) and a smooth host-to-OS workflow for importing and testing videos via QEMU virtio-9p hostshare. It also improves hostshare browsing reliability and integrates .avi launching from the File Manager.

Key Features

Video Player app (MJPEG AVI)

Plays MJPEG-in-AVI in a window with fullscreen support.
Controls: Play/Pause, seek, next/prev playlist, numeric selection.
Opens .avi directly from the File Manager.
Hostshare integration (virtio-9p)

Adds /Host/ (hostshare root) and /Videos/Host/ (hostshare Videos) access from the File Manager.
More robust directory listing for QEMU 9P2000.L (Treaddir/Rreaddir) and improved stability/diagnostics.
Host video sync + conversion

Adds hostshare-sync-videos.sh invoked by make run-gui / make run-gpu.
Scans hostshare/Videos/ for AVI, auto-converts non‑MJPEG AVIs to MJPEG into hostshare/Videos/_mjpg/, and regenerates videos.txt.
Boot-time import into /Videos/

On boot, imports playlist entries from videos.txt into the OS /Videos/ folder.
Converted _mjpg files are imported under the original .avi name for a cleaner UX.
Transparent playback fallback

If an original host .avi isn’t MJPEG, the player automatically tries the converted _mjpg version when available.
How To Test

Put any AVI files into hostshare/Videos/ on the host.
Run: make run-gui or make run-gpu
In Vib‑OS:
Browse /Videos/ (imported copies) or /Host/Videos/ (direct host files).
Double-click an .avi to open in Video Player.
Verify playback + controls (Space/P, [ ], B/N, F, < >, 1-9).
Notes / Limitations

Playback is currently MJPEG-in-AVI (video only). “Standard” AVI codecs (H.264/DivX/etc.) are supported through host-side conversion, not native decoding yet.
Hostshare is read-only by design in this dev workflow.
Files / Areas Touched

Video player + File Manager launch integration: window.c
AVI MJPEG demuxer: avi.c, avi.h
Hostshare import on boot + docs: main.c
Virtio-9p client improvements: virtio_9p.c, virtio_9p.h
Host sync/conversion script + run targets: hostshare-sync-videos.sh, Makefile
Hostshare docs: README.txt