mirui 0.42.0

A lightweight, no_std ECS-driven UI framework for embedded, desktop, and WebAssembly
Documentation 
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use crate::render::command::CompositeMode;
use crate::render::raster::FillRule;
use crate::types::{Color, Fixed, Point, Rect, Transform};

use super::font::Font;
use super::path::Path;
use super::texture::Texture;

pub use mirx::{LineCap, LineJoin, Paint};

/// Rasterization interface. All coordinate parameters (`area`, `clip`,
/// `pos`, path points, widths, radii, `dst`, `dst_size`) are in
/// **logical pixels**; implementations convert to physical internally
/// (typically by holding a `Viewport` field).
pub trait Canvas {
    fn fill_path(&mut self, path: &Path, clip: &Rect, paint: &Paint, opa: u8, fill_rule: FillRule);
    #[allow(clippy::too_many_arguments)]
    fn stroke_path(
        &mut self,
        path: &Path,
        clip: &Rect,
        width: Fixed,
        paint: &Paint,
        opa: u8,
        cap: crate::render::raster::LineCap,
        join: crate::render::raster::LineJoin,
        miter_limit: Fixed,
        dash: &[Fixed],
    );
    #[allow(clippy::too_many_arguments)]
    fn blit(
        &mut self,
        src: &Texture,
        src_rect: &Rect,
        dst: Point,
        dst_size: Point,
        clip: &Rect,
        opa: u8,
        radius: Fixed,
        composite: CompositeMode,
    );
    fn clear(&mut self, area: &Rect, color: &Color);
    fn draw_label(
        &mut self,
        pos: &Point,
        text: &str,
        font: &Font,
        clip: &Rect,
        color: &Color,
        opa: u8,
    );
    fn flush(&mut self);

    fn push_clip(&mut self, _path: &Path, _transform: &Transform, _fill_rule: FillRule) {}

    fn pop_clip(&mut self) {}

    fn fill_rect(&mut self, area: &Rect, clip: &Rect, color: &Color, radius: Fixed, opa: u8) {
        let path = Path::rounded_rect(area.x, area.y, area.w, area.h, radius);
        let paint = Paint::Color((*color).into());
        self.fill_path(&path, clip, &paint, opa, FillRule::EvenOdd);
    }

    fn stroke_rect(
        &mut self,
        area: &Rect,
        clip: &Rect,
        width: Fixed,
        color: &Color,
        radius: Fixed,
        opa: u8,
    ) {
        let path = Path::rounded_rect(
            area.x + width / 2,
            area.y + width / 2,
            area.w - width,
            area.h - width,
            (radius - width / 2).max(Fixed::ZERO),
        );
        let paint = Paint::Color((*color).into());
        self.stroke_path(
            &path,
            clip,
            width,
            &paint,
            opa,
            crate::render::raster::LineCap::Butt,
            crate::render::raster::LineJoin::Miter,
            Fixed::from_int(4),
            &[],
        );
    }

    fn draw_line(
        &mut self,
        p1: Point,
        p2: Point,
        clip: &Rect,
        width: Fixed,
        color: &Color,
        opa: u8,
    ) {
        let mut path = Path::new();
        path.move_to(p1).line_to(p2);
        let paint = Paint::Color((*color).into());
        self.stroke_path(
            &path,
            clip,
            width,
            &paint,
            opa,
            crate::render::raster::LineCap::Butt,
            crate::render::raster::LineJoin::Miter,
            Fixed::from_int(4),
            &[],
        );
    }

    /// Draw a stroked circular arc. Angles in degrees, CCW from +X axis.
    // Signature locked by design.md ยง8 (user-confirmed):
    // (center, radius, start_angle, end_angle) + standard stroke params.
    #[allow(clippy::too_many_arguments)]
    fn draw_arc(
        &mut self,
        center: Point,
        radius: Fixed,
        start_angle: Fixed,
        end_angle: Fixed,
        clip: &Rect,
        width: Fixed,
        color: &Color,
        opa: u8,
    ) {
        let path = Path::arc(center, radius, start_angle, end_angle);
        let paint = Paint::Color((*color).into());
        self.stroke_path(
            &path,
            clip,
            width,
            &paint,
            opa,
            crate::render::raster::LineCap::Butt,
            crate::render::raster::LineJoin::Miter,
            Fixed::from_int(4),
            &[],
        );
    }
}