GUI Subsystem

GUI Subsystem

Windowed compositor with 1024×768 32bpp framebuffer, 32 windows, taskbar, Start menu, 4 workspaces.

See also: Drivers, Filesystem, Architecture, Boot Process

VBE framebuffer (vbe.c)

Bochs VBE extensions, LFB at 0xE0000000. fb.c provides put_pixel, fill_rect, blit, draw_char.

Bitmap font (font.c)

IBM VGA 8×16 ROM font, 256 glyphs.

Compositor (compositor.c)

Windows in z-order, per-workspace, with titlebar drag, resize, minimize, close. Yields CPU when idle (sleep 5 ms).

Built-in apps

• Terminal: 80×24 grid, scrollback, tab-completion, per-shell CWD, command history. See Shell.
• File Manager: VFS browsing, copy/paste, drag-drop, context menu, search
• Text Editor: File open/save, cursor nav, click-to-position, scroll
• Image Viewer: Test pattern, zoom/pan
• Sound Test: PC speaker + SB16 buttons
• Calculator: Basic arithmetic
• Task Manager: Process list
• DOOM: VGA mode 13h port (requires doom1.wad)
• Paint: Freehand drawing with mouse