Method fill

std/src/gfx/lcd/buffered/mod.rs:265–297

Fills the area contained between `x1y1` and `x2y2` (inclusive) with the current drawing color. If syncing is enabled, this writes directly to the LCD. Otherwise, this writes to the framebuffer and records the area as damaged.

(&mut self, x1y1: LcdXY, x2y2: LcdXY)

    /// If syncing is enabled, this writes directly to the LCD.  Otherwise, this writes to the
    /// framebuffer and records the area as damaged.
    fn fill(&mut self, x1y1: LcdXY, x2y2: LcdXY) -> io::Result<()> {
        // Prepare self.row_buffer with the content of every row to be copied to the framebuffer.
        // We do this for efficiency reasons because manipulating individual pixels is costly.
        let rowlen = {
            let xlen = x2y2.x - x1y1.x + 1;
            let rowlen = xlen * self.stride;
            self.row_buffer.clear();
            let color = self.draw_color.as_slice();
            for _ in 0..xlen {
                self.row_buffer.extend_from_slice(color);
            }
            debug_assert_eq!(rowlen, self.row_buffer.len());
            rowlen
        };

        if self.sync {
            let mut data = LcdSize::between(x1y1, x2y2).new_buffer(self.stride);
            for y in x1y1.y..(x2y2.y + 1) {
                let offset = self.fb_addr(x1y1.x, y);
                self.fb[offset..offset + rowlen].copy_from_slice(&self.row_buffer);
                data.extend(&self.row_buffer);
            }
            self.lcd.set_data(x1y1, x2y2, &data)?;
        } else {
            for y in x1y1.y..(x2y2.y + 1) {
                let offset = self.fb_addr(x1y1.x, y);
                self.fb[offset..offset + rowlen].copy_from_slice(&self.row_buffer);
            }
            self.damage(x1y1, x2y2);
        }

        Ok(())
    }

    /// Flushes any pending damaged area to the LCD.
    fn force_present_canvas(&mut self) -> io::Result<()> {