driver.video.lvgl¶

Pascal bindings for the LVGL 9.x embedded GUI library.

Overview¶

This unit provides Free Pascal type declarations and external function imports for the LVGL 9.x C library. It exposes opaque pointer types for all major LVGL objects, stack-allocatable record types with known sizes for styles and animations, colour types, and the full LVGL widget and drawing API surface used by driver.video.desktop and driver.video.windows.

Dependencies¶

(LVGL shared library / linked object — C ABI)

Types¶

Opaque Pointer Types¶

All major LVGL object types are declared as opaque pointers to avoid exposing the internal C struct layouts:

Plv_display, Plv_indev, Plv_obj, Plv_group, Plv_theme, Plv_font_t, Plv_style_t (pointer), Plv_anim_t (pointer), Plv_event_t, Plv_timer_t.

Stack-Allocatable Types¶

These types have fixed known sizes matching their C struct counterparts and can be allocated on the Pascal stack or in records:

Type	Size	Description
`lv_style_t`	16 bytes	Style descriptor
`lv_anim_t`	128 bytes	Animation descriptor
`lv_style_transition_dsc_t`	24 bytes	Style transition descriptor

Colour Types¶

lv_color32_t = packed record
  blue  : uint8;
  green : uint8;
  red   : uint8;
  alpha : uint8;
end;
lv_color_t = lv_color32_t;

32-bit BGRA colour value matching LVGL's native colour format.

lv_area_t¶

lv_area_t = record
  x1, y1, x2, y2 : sint32;
end;

Axis-aligned bounding rectangle used throughout the LVGL drawing API.

Enumerations¶

LVGL state flags (LV_STATE_*), part selectors (LV_PART_*), alignment constants (LV_ALIGN_*), layout types (LV_LAYOUT_*), flex flow and alignment values, text alignment, border sides, and event codes (LV_EVENT_*) are declared as typed constants or enumerations matching the C header values.

Notes¶

All LVGL functions are imported via external declarations using the C calling convention. The LVGL library must be linked into the kernel binary.
Only the subset of the LVGL API actually used by the desktop and window manager is bound; the complete LVGL API is not fully mapped.
lv_color_t is always 32-bit in this build; LVGL is compiled with LV_COLOR_DEPTH=32.