Get the framebuffer as a raw 2D array

[ghost]

Hi,
I am using pixels for some time now and i would like to know a way to access the framebuffer like a 2D array (width, height), however I am not able to find something. i need this so i can change a pixel's color in a specified position, eg:

let (x, y) = (32, 43);
let color: [u8; 4] = [0xF2, 0xA3, 0x4D, 0xFF]
let pixels = /* Creating the buffer etc */
pixels[x][y] = color;

[parasyte]

Honestly there is no need for a 2D array, but you might be able to cast the slice to a slice-of-slices with something like bytemuck if you really want to.

Traditionally, pixel plotting would be done with the formula:

let index = (y * width + x) * 4;

Since the color is itself a slice, you can use slice::copy_from_slice() to copy its contents to the buffer:

buffer[index..index + 4].copy_from_slice(&color);

Something like this.

Have a look at the minimal example to see how it copies colors to the buffer:

pixels/examples/minimal-winit/src/main.rs

Lines 103 to 124 in 4ee5006

	/// Draw the `World` state to the frame buffer.
	///
	/// Assumes the default texture format: `wgpu::TextureFormat::Rgba8UnormSrgb`
	fn draw(&self, frame: &mut [u8]) {
	for (i, pixel) in frame.chunks_exact_mut(4).enumerate() {
	let x = (i % WIDTH as usize) as i16;
	let y = (i / WIDTH as usize) as i16;
	let inside_the_box = x >= self.box_x
	&& x < self.box_x + BOX_SIZE
	&& y >= self.box_y
	&& y < self.box_y + BOX_SIZE;
	let rgba = if inside_the_box {
	[0x5e, 0x48, 0xe8, 0xff]
	} else {
	[0x48, 0xb2, 0xe8, 0xff]
	};
	pixel.copy_from_slice(&rgba);
	}
	}

[ghost]

Just a question, buffer is the Pixels framebuffer or something else?

[parasyte]

Yes, that would be the framebuffer from Pixels::get_frame().