Struct Rgba

Source

#[repr(C)]pub struct Rgba {
    pub r: u8,
    pub g: u8,
    pub b: u8,
    pub a: u8,
}

Expand description

One RGBA8 pixel of the graphics model (straight, not premultiplied, alpha). In the buffer: the bytes r, g, b, a.

Fields§

§r: u8§g: u8§b: u8§a: u8

Implementations§

Source §

pub const fn rgb(r: u8, g: u8, b: u8) -> Self

Opaque.

Source

pub const fn hex(rgb: u32) -> Self

0xRRGGBB, opaque (the form crate::view::Theme reports).

Examples found in repository ?

examples/shapes_stage.rs (line 32)

24    fn frame(&mut self, frame: &Frame) {
25        let (w, h) = self.stage.size();
26        if w == 0 || h == 0 {
27            // No pixel geometry yet: a resize will follow.
28            return;
29        }
30        let theme = view::theme();
31        let (fg, bg, accent) = (
32            Rgba::hex(theme.fg),
33            Rgba::hex(theme.bg),
34            Rgba::hex(theme.accent),
35        );
36        let t = (frame.now_ms() % 4000) as f32 / 4000.0;
37
38        // A full repaint: nothing is carried forward from the last frame.
39        self.stage.clear(bg);
40        let panel = Area::new(8, 8, w.saturating_sub(16), h.saturating_sub(16));
41        self.stage
42            .fill_rounded_rect(panel, 12, Rgba::hex(theme.recede_bg));
43        self.stage
44            .rounded_rect(panel, 12, Rgba::hex(theme.recede_fg));
45
46        let (cx, cy) = (w as f32 / 2.0, h as f32 / 2.0);
47        let radius = (w.min(h) / 4) as f32;
48        let angle = t * core::f32::consts::TAU;
49        // `no_std` has no `f32::sin`: the SDK re-exports `libm`. The dot
50        // moves between pixels; the shapes antialias it there.
51        let dot = (
52            cx + radius * libm::cosf(angle),
53            cy + radius * libm::sinf(angle),
54        );
55        self.stage
56            .circle((cx, cy), radius, Rgba::hex(theme.recede_fg));
57        self.stage
58            .line((cx as i32, cy as i32), (dot.0 as i32, dot.1 as i32), accent);
59        self.stage.fill_circle(dot, 6.0, accent);
60
61        let bar = Area::new(24, h as i32 - 40, w.saturating_sub(48), 8);
62        self.stage
63            .bar(bar, t, accent, Rgba::hex(theme.recede_fg).with_alpha(96));
64        self.stage.label(24, 24, "shapes", fg);
65        let _ = self.stage.commit();
66
67        match frame.power() {
68            Power::Mains => frame.request_frame(),
69            Power::SavePower => frame.wake_after(1000),
70        }
71    }

Source

pub const fn with_alpha(self, a: u8) -> Self

Examples found in repository ?

examples/shapes_stage.rs (line 63)

24    fn frame(&mut self, frame: &Frame) {
25        let (w, h) = self.stage.size();
26        if w == 0 || h == 0 {
27            // No pixel geometry yet: a resize will follow.
28            return;
29        }
30        let theme = view::theme();
31        let (fg, bg, accent) = (
32            Rgba::hex(theme.fg),
33            Rgba::hex(theme.bg),
34            Rgba::hex(theme.accent),
35        );
36        let t = (frame.now_ms() % 4000) as f32 / 4000.0;
37
38        // A full repaint: nothing is carried forward from the last frame.
39        self.stage.clear(bg);
40        let panel = Area::new(8, 8, w.saturating_sub(16), h.saturating_sub(16));
41        self.stage
42            .fill_rounded_rect(panel, 12, Rgba::hex(theme.recede_bg));
43        self.stage
44            .rounded_rect(panel, 12, Rgba::hex(theme.recede_fg));
45
46        let (cx, cy) = (w as f32 / 2.0, h as f32 / 2.0);
47        let radius = (w.min(h) / 4) as f32;
48        let angle = t * core::f32::consts::TAU;
49        // `no_std` has no `f32::sin`: the SDK re-exports `libm`. The dot
50        // moves between pixels; the shapes antialias it there.
51        let dot = (
52            cx + radius * libm::cosf(angle),
53            cy + radius * libm::sinf(angle),
54        );
55        self.stage
56            .circle((cx, cy), radius, Rgba::hex(theme.recede_fg));
57        self.stage
58            .line((cx as i32, cy as i32), (dot.0 as i32, dot.1 as i32), accent);
59        self.stage.fill_circle(dot, 6.0, accent);
60
61        let bar = Area::new(24, h as i32 - 40, w.saturating_sub(48), 8);
62        self.stage
63            .bar(bar, t, accent, Rgba::hex(theme.recede_fg).with_alpha(96));
64        self.stage.label(24, 24, "shapes", fg);
65        let _ = self.stage.commit();
66
67        match frame.power() {
68            Power::Mains => frame.request_frame(),
69            Power::SavePower => frame.wake_after(1000),
70        }
71    }