embedded-graphics-simulator 0.2.0

Embedded graphics simulator
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136

use crate::{display::SimulatorDisplay, output_settings::OutputSettings};
use embedded_graphics::{
    drawable::{Drawable, Pixel},
    geometry::{Point, Size},
    pixelcolor::{PixelColor, Rgb888, RgbColor},
    primitives::{Primitive, Rectangle},
    style::{PrimitiveStyle, Styled},
    DrawTarget,
};
use image::{ImageBuffer, Rgb};
use std::convert::TryFrom;

/// Rgb888 framebuffer
#[derive(Debug, PartialEq, Eq, Clone)]
pub struct Framebuffer {
    size: Size,
    pub(crate) data: Box<[u8]>,
    pub(crate) output_settings: OutputSettings,
}

impl Framebuffer {
    /// Creates a new framebuffer filled with `background_color`.
    pub fn new<C>(display: &SimulatorDisplay<C>, output_settings: &OutputSettings) -> Self
    where
        C: PixelColor + Into<Rgb888>,
    {
        let size = output_settings.framebuffer_size(display);

        // Create an empty pixel buffer.
        let pixel_count = size.width as usize * size.height as usize;
        let data = vec![0; pixel_count * 3].into_boxed_slice();

        let mut framebuffer = Self {
            size,
            data,
            output_settings: output_settings.clone(),
        };

        // Fill pixel buffer with background color.
        let background_color = output_settings.theme.convert(Rgb888::BLACK);
        framebuffer.clear(background_color).unwrap();

        // Update buffer.
        framebuffer.update(display);

        framebuffer
    }

    /// Updates the framebuffer from a `SimulatorDisplay`.
    pub fn update<C>(&mut self, display: &SimulatorDisplay<C>)
    where
        C: PixelColor + Into<Rgb888>,
    {
        let Size { width, height } = display.size();

        let pixel_pitch = (self.output_settings.scale + self.output_settings.pixel_spacing) as i32;
        let pixel_size = Size::new(
            self.output_settings.scale - 1,
            self.output_settings.scale - 1,
        );

        for y in 0..height as i32 {
            for x in 0..width as i32 {
                let color = display.get_pixel(Point::new(x, y)).into();
                let p = Point::new(x * pixel_pitch, y * pixel_pitch);

                Rectangle::new(p, p + pixel_size)
                    .into_styled(PrimitiveStyle::with_fill(
                        self.output_settings.theme.convert(color),
                    ))
                    .draw(self)
                    .ok();
            }
        }
    }

    fn get_pixel_mut(&mut self, point: Point) -> Option<&mut [u8]> {
        if let Ok((x, y)) = <(u32, u32)>::try_from(point) {
            if x < self.size.width && y < self.size.height {
                let start_index = (x + y * self.size.width) as usize * 3;
                return self.data.get_mut(start_index..start_index + 3);
            }
        }

        None
    }

    /// Converts the framebuffer into an image.rs `ImageBuffer`.
    pub fn into_image_buffer(self) -> ImageBuffer<Rgb<u8>, Box<[u8]>> {
        ImageBuffer::from_raw(self.size.width, self.size.height, self.data).unwrap()
    }
}

impl DrawTarget<Rgb888> for Framebuffer {
    type Error = core::convert::Infallible;

    fn draw_pixel(&mut self, pixel: Pixel<Rgb888>) -> Result<(), Self::Error> {
        let Pixel(point, color) = pixel;

        if let Some(pixel) = self.get_pixel_mut(point) {
            pixel.copy_from_slice(&[color.r(), color.g(), color.b()]);
        }

        Ok(())
    }

    fn draw_rectangle(
        &mut self,
        item: &Styled<Rectangle, PrimitiveStyle<Rgb888>>,
    ) -> Result<(), Self::Error> {
        if item.style.stroke_color.is_some() && item.style.stroke_width != 0 {
            return self.draw_iter(item);
        }

        if let Some(fill_color) = item.style.fill_color {
            let color = &[fill_color.r(), fill_color.g(), fill_color.b()];

            let tl = item.primitive.top_left;
            let br = item.primitive.bottom_right;
            for y in tl.y..=br.y {
                for x in tl.x..=br.x {
                    let p = Point::new(x, y);
                    if let Some(pixel) = self.get_pixel_mut(p) {
                        pixel.copy_from_slice(color);
                    }
                }
            }
        }

        Ok(())
    }

    fn size(&self) -> Size {
        self.size
    }
}