refactored for architectures and added riscv support

kernel/src/arch/x86_64/framebuffer.rs

@@ -0,0 +1,172 @@
+use bootloader_api::info::FrameBuffer;
+use embedded_graphics::{
+    draw_target::DrawTarget,
+    geometry::{Dimensions, OriginDimensions, Point, Size},
+    mono_font::{ascii::FONT_6X10, MonoTextStyle},
+    pixelcolor::{Rgb888, RgbColor},
+    primitives::{
+        Circle, Primitive, PrimitiveStyle, PrimitiveStyleBuilder, Rectangle, StrokeAlignment,
+        Triangle,
+    },
+    text::{Alignment, Text},
+    Drawable, Pixel,
+};
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct Position {
+    pub x: usize,
+    pub y: usize,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct Color {
+    pub red: u8,
+    pub green: u8,
+    pub blue: u8,
+}
+
+pub fn set_pixel_in(framebuffer: &mut FrameBuffer, position: Position, color: Color) {
+    let info = framebuffer.info();
+    let byte_offset = {
+        let line_offset = position.y * info.stride;
+        let pixel_offset = line_offset + position.x;
+        pixel_offset * info.bytes_per_pixel
+    };
+    let pixel_buffer = &mut framebuffer.buffer_mut()[byte_offset..];
+    match info.pixel_format {
+        bootloader_api::info::PixelFormat::Rgb => {
+            pixel_buffer[0] = color.red;
+            pixel_buffer[1] = color.green;
+            pixel_buffer[2] = color.blue;
+        }
+        bootloader_api::info::PixelFormat::Bgr => {
+            pixel_buffer[0] = color.blue;
+            pixel_buffer[1] = color.green;
+            pixel_buffer[2] = color.red;
+        }
+        bootloader_api::info::PixelFormat::U8 => {
+            let gray = color.red / 3 + color.green / 3 + color.blue / 3;
+            pixel_buffer[0] = gray;
+        }
+        other => panic!("unknown pixel format {other:?}"),
+    }
+}
+
+pub struct Display<'a> {
+    framebuffer: &'a mut FrameBuffer,
+}
+
+impl<'a> Display<'a> {
+    pub fn new(framebuffer: &'a mut FrameBuffer) -> Self {
+        Self { framebuffer }
+    }
+
+    fn draw_pixel(&mut self, pos: Position, color: Color) {
+        let (width, height) = {
+            let info = self.framebuffer.info();
+            (info.width, info.height)
+        };
+        if pos.x >= width || pos.y >= height {
+            return;
+        }
+        set_pixel_in(&mut self.framebuffer, pos, color);
+    }
+}
+
+impl OriginDimensions for Display<'_> {
+    fn size(&self) -> embedded_graphics::prelude::Size {
+        let info = self.framebuffer.info();
+        Size {
+            width: info.width as u32,
+            height: info.height as u32,
+        }
+    }
+}
+
+impl DrawTarget for Display<'_> {
+    type Color = Rgb888;
+    type Error = core::convert::Infallible;
+    fn draw_iter<I>(&mut self, pixels: I) -> Result<(), Self::Error>
+    where
+        I: IntoIterator<Item = Pixel<Self::Color>>,
+    {
+        for Pixel(coordinates, color) in pixels.into_iter() {
+            self.draw_pixel(
+                Position {
+                    x: coordinates.x as usize,
+                    y: coordinates.y as usize,
+                },
+                Color {
+                    red: color.r(),
+                    green: color.g(),
+                    blue: color.b(),
+                },
+            );
+        }
+        Ok(())
+    }
+}
+
+pub fn draw_test(framebuffer: &mut FrameBuffer) {
+    for b in framebuffer.buffer_mut() {
+        *b = 0;
+    }
+    let mut display = Display::new(framebuffer);
+    // Create styles used by the drawing operations.
+    let thin_stroke = PrimitiveStyle::with_stroke(Rgb888::new(0, 255, 255), 1);
+    let thick_stroke = PrimitiveStyle::with_stroke(Rgb888::new(0, 255, 255), 3);
+    let border_stroke = PrimitiveStyleBuilder::new()
+        .stroke_color(Rgb888::new(0, 255, 255))
+        .stroke_width(3)
+        .stroke_alignment(StrokeAlignment::Inside)
+        .build();
+    let fill = PrimitiveStyle::with_fill(Rgb888::new(0, 255, 255));
+    let character_style = MonoTextStyle::new(&FONT_6X10, Rgb888::new(0, 255, 255));
+
+    let yoffset = 10;
+
+    // Draw a 3px wide outline around the display.
+    display
+        .bounding_box()
+        .into_styled(border_stroke)
+        .draw(&mut display)
+        .unwrap();
+
+    Rectangle::new(Point::new(52, yoffset), Size::new(16, 16))
+        .into_styled(fill)
+        .draw(&mut display)
+        .unwrap();
+
+    // Draw a triangle.
+    Triangle::new(
+        Point::new(16, 16 + yoffset),
+        Point::new(16 + 16, 16 + yoffset),
+        Point::new(16 + 8, yoffset),
+    )
+    .into_styled(thin_stroke)
+    .draw(&mut display)
+    .unwrap();
+
+    // Draw a filled square
+    Rectangle::new(Point::new(52, yoffset), Size::new(16, 16))
+        .into_styled(fill)
+        .draw(&mut display)
+        .unwrap();
+
+    // Draw a circle with a 3px wide stroke.
+    Circle::new(Point::new(88, yoffset), 17)
+        .into_styled(thick_stroke)
+        .draw(&mut display)
+        .unwrap();
+
+    // Draw centered text.
+    let text = "jugando";
+    Text::with_alignment(
+        text,
+        display.bounding_box().center() + Point::new(0, 15),
+        character_style,
+        Alignment::Center,
+    )
+    .draw(&mut display)
+    .unwrap();
+}