sawyer/picocalc-os-rs
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only mark framebuffer tile as dirty if pixel changes

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sawyer bristol
2025-10-27 12:30:23 -06:00
parent f6d5fb98ab
commit 999b22a96f
1 changed files with 24 additions and 21 deletions
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39
kernel/src/framebuffer.rs
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@@ -38,10 +38,6 @@ static mut DIRTY_TILES: LazyLock<heapless::Vec<AtomicBool, TILE_COUNT>> = LazyLo
pub struct AtomicFrameBuffer;
impl AtomicFrameBuffer {
pub const fn new() -> Self {
Self
}
fn mark_tiles_dirty(&mut self, rect: Rectangle) {
let tiles_x = (SCREEN_WIDTH + TILE_SIZE - 1) / TILE_SIZE;
let start_tx = (rect.top_left.x as usize) / TILE_SIZE;
@@ -57,12 +53,6 @@ impl AtomicFrameBuffer {
}
}
fn set_pixel(&mut self, x: u16, y: u16, color: u16) -> Result<(), ()> {
unsafe { BUFFER[(y as usize * SCREEN_WIDTH) + x as usize] = color };
Ok(())
}
fn set_pixels_buffered<P: IntoIterator<Item = u16>>(
&mut self,
sx: u16,
@@ -262,6 +252,7 @@ impl DrawTarget for AtomicFrameBuffer {
I: IntoIterator<Item = Pixel<Self::Color>>,
{
let mut dirty_rect: Option<Rectangle> = None;
let mut changed = false;
for Pixel(coord, color) in pixels {
if coord.x >= 0 && coord.y >= 0 {
@@ -269,10 +260,14 @@ impl DrawTarget for AtomicFrameBuffer {
let y = coord.y as i32;
if (x as usize) < SCREEN_WIDTH && (y as usize) < SCREEN_HEIGHT {
let idx = (y as usize) * SCREEN_WIDTH + (x as usize);
let raw_color = RawU16::from(color).into_inner();
unsafe {
BUFFER[(y as usize) * SCREEN_WIDTH + (x as usize)] =
RawU16::from(color).into_inner()
};
if BUFFER[idx] != raw_color {
BUFFER[idx] = raw_color;
changed = true;
}
}
if let Some(ref mut rect) = dirty_rect {
rect.top_left.x = rect.top_left.x.min(x);
@@ -288,9 +283,11 @@ impl DrawTarget for AtomicFrameBuffer {
}
}
if changed {
if let Some(rect) = dirty_rect {
self.mark_tiles_dirty(rect);
}
}
Ok(())
}
@@ -307,6 +304,7 @@ impl DrawTarget for AtomicFrameBuffer {
let area_width = area.size.width;
let area_height = area.size.height;
let mut colors = colors.into_iter();
let mut changed = false;
for y in 0..area_height {
for x in 0..area_width {
@@ -314,11 +312,14 @@ impl DrawTarget for AtomicFrameBuffer {
if drawable_area.contains(p) {
if let Some(color) = colors.next() {
self.set_pixel(
p.x as u16,
p.y as u16,
RawU16::from(color).into_inner(),
)?;
let idx = (p.y as usize * SCREEN_WIDTH) + (p.x as usize);
let raw_color = RawU16::from(color).into_inner();
unsafe {
if BUFFER[idx] != raw_color {
BUFFER[idx] = raw_color;
changed = true;
}
}
} else {
break;
}
@@ -329,8 +330,10 @@ impl DrawTarget for AtomicFrameBuffer {
}
}
if changed {
self.mark_tiles_dirty(*area);
}
}
Ok(())
}