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use crate::diff::{diff, pixel_diff};
use crate::split::split;
use crate::{Block, Frame, Ref, View, P2};
pub struct EncodeConfig {
pub threshold: u32,
pub max_block_size: usize,
pub iters: usize,
}
pub fn encode(last_frame: &Frame, frame: &Frame, view: View, config: &EncodeConfig) -> Block {
let view_area = view.size().area();
if view_area > config.max_block_size {
let [av, bv] = split(view);
let (ab, bb) = rayon::join(
|| Box::new(encode(last_frame, frame, av, config)),
|| Box::new(encode(last_frame, frame, bv, config)),
);
return Block::Split(ab, bb);
}
let mut r = Ref::default();
let mut d = diff([last_frame, frame], view, r);
let att = 1. - attention(frame, view) as f32 * 0.000001;
let thres = (config.threshold as f32 * att.clamp(0.2, 1.0)) as u32;
for granularity in [4, 2, 1] {
for _ in 0..config.iters {
let (nd, nrp) = optimize_ref(last_frame, frame, view, d, r, granularity);
if nd < d {
r = nrp;
d = nd;
} else {
break;
}
}
}
if d < thres {
return Block::Ref(r);
} else {
Block::Lit(frame.export(view))
}
}
pub fn optimize_ref(
last_frame: &Frame,
frame: &Frame,
view: View,
mut d: u32,
mut r: Ref,
granularity: i32,
) -> (u32, Ref) {
let mut n = |f: fn(&mut Ref, i32)| {
let mut r2 = r;
f(&mut r2, granularity);
let d2 = diff([last_frame, frame], view, r2);
if d2 < d {
d = d2;
r = r2;
}
};
n(|r, g| r.pos_off.x += g);
n(|r, g| r.pos_off.x -= g);
n(|r, g| r.pos_off.y += g);
n(|r, g| r.pos_off.y -= g);
n(|r, g| r.color_off.r += (g as i16) << 2);
n(|r, g| r.color_off.r -= (g as i16) << 2);
n(|r, g| r.color_off.g += (g as i16) << 2);
n(|r, g| r.color_off.g -= (g as i16) << 2);
n(|r, g| r.color_off.b += (g as i16) << 2);
n(|r, g| r.color_off.b -= (g as i16) << 2);
(d, r)
}
pub fn attention(frame: &Frame, view: View) -> u32 {
let mut k = 0;
for y in view.a.y..view.b.y - 1 {
for x in view.a.x..view.b.x - 1 {
let p = P2 { x, y };
k += pixel_diff(frame[p], frame[p + P2::X]).pow(2);
k += pixel_diff(frame[p], frame[p + P2::Y]).pow(2);
}
}
k
}
|
