Crate denise 

Denise — a direct-rendering UI toolkit for systems without a desktop environment.

This crate is the platform-agnostic core. It owns geometry, colour, the pixel buffer contract, input events and damage tracking. It contains no platform code and no unsafe.

Backends implement two traits:

• Surface — hands out a Frame to draw into and presents damaged regions.
• InputSource — drains platform input into InputEvents.

Frame lifecycle

let mut frame = surface.acquire()?;
// The buffer we just got back may be several frames old. Repaint everything
// that has been damaged since it was last current, not just this frame's damage.
let damage: &[Rect] = tracker.resolve(frame.age());
// ... draw into `frame`, clipped to `damage` ...
drop(frame);
surface.present(damage)?;
tracker.end_frame();

Getting that sequence wrong is the classic double-buffering bug: repaint only the current frame’s damage and every second frame shows stale content.

Status

M0. The abstraction exists and is proven against a desktop backend; the scene graph, component model and hardware backends are not here yet. See the README.

Re-exports

pub use color::Color;

pub use damage::DamageTracker;

pub use damage::MAX_DAMAGE_RECTS;

pub use damage::RectList;

pub use geom::Point;

pub use geom::Rect;

pub use geom::Size;

pub use input::ElementState;

pub use input::InputEvent;

pub use input::InputSource;

pub use input::KeyCode;

pub use input::Modifiers;

pub use input::PointerButton;

pub use input::TouchId;

pub use surface::BufferAge;

pub use surface::Frame;

pub use surface::PixelFormat;

pub use surface::Surface;

pub use surface::SurfaceError;

pub use theme::ColorScheme;

pub use theme::Metrics;

pub use theme::Radius;

pub use theme::Role;

pub use theme::Theme;

Modules

color

Straight (non-premultiplied) 8-bit-per-channel colour.

damage

Dirty-rectangle tracking.

geom

Integer geometry.

input

Backend-independent input events.

surface

The pixel buffer contract every backend implements.

theme

Semantic theming.