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#[derive(Debug)]
pub struct RenderBuffer {
	pub buffer: Vec<u32>,
	pub width:  usize,
	pub height: usize,
}

/*
pub struct PixelInBlockMut<'a> {
	block_x: u32,
	block_y: u32,
	render_buffer: &'a mut RenderBuffer,
}
impl<'a> std::iter::Iterator for PixelInBlockMut<'a> {
	type Item = ( u32, u32, u32, u32, &'a mut u32 );
	fn next(&mut self) -> Option<Self::Item> {
		let w = self.render_buffer.width as u32;
		let h = self.render_buffer.height as u32;

		if self.block_x < w && self.block_y < h {
			let o = self.block_y * w + self.block_x;
			self.block_x += 1;
			if self.block_x >= w {
				self.block_x = 0;
				self.block_y +=1 ;
			}
			Some( ( 0, 0, 0, 0, &mut self.render_buffer.buffer[ o as usize ] ) )
		}
		else
		{
			None
		}
	}
}
*/
/*
impl PixelInBlockIteratorMut for RenderBuffer {
	type Item<'a> = ( u32, u32, u32, u32, &'a mut u32 );
	fn next(&mut self) -> Option<Self::Item> {
		None
	}
}
*/
impl RenderBuffer {
	pub fn new(width: usize, height: usize) -> Self {
		Self {
			buffer: vec![0u32; width * height],
			width,
			height,
		}
	}
	pub fn for_pixel_in_block(
		&mut self,
		pos_x: u32,
		pos_y: u32,
		width: u32,
		height: u32,
		mut func: impl FnMut(u32, u32, u32, u32, &mut u32),
	) {
		for y in 0..height {
			let py = y + pos_y;
			if py >= self.height as u32 {
				continue;
			}
			for x in 0..width {
				let px = x + pos_x;
				if px >= self.width as u32 {
					continue;
				}

				//				dbg!(&px, &py);

				let o = (py * self.width as u32 + px) as usize;
				let p = &mut self.buffer[o];
				func(px, py, x, y, p);
			}
		}
	}
	/*
		pub fn enumerate_pixel_in_block_mut( &mut self, x: u32, y: u32, width: u32, height: u32 ) -> PixelInBlockMut {
			PixelInBlockMut {
				block_x: 0,
				block_y: 0,
				render_buffer: self,
			}
		}
	*/
}