d67c1da467
The title screen needs an order that puts element 13 (`ptbase2.t32`, the full-screen background) behind elements 0-5 (the wordmarks) — the capture shows the wordmarks on top, so the declaration table is not it. Two other orderings the bundle carries were the cheap candidates, and both are now dead: * the **placement region** stores a keyframe group per element with an explicit element index, so it could be a second ordering. It is not — it equals the declaration order on every build on the disc. `UiBuild::placement_order` exposes it and `placement_region_order_is_never_a_second_ordering` pins it, so the refutation stays checkable instead of remembered. * the **RATC child order** is the declaration order with the `.prm` elements absent — strictly less information, and no place to put the background other than where the table already puts it. `screen info --geometry` prints both, plus each element's decoded sprite size beside `pivot*2` and every keyframe's scale/position/time — the numbers a placement hypothesis has to be tested against, and how the pivot/scale rule in the previous commit was found. `title_background_is_full_screen` pins that rule against the disc rather than a synthetic sprite. `scaled_elements_are_a_small_and_mostly_undiscriminating_minority` reports the scope honestly: 865 of 5 130 resting placements are scaled at all, and only 213 of those could tell "about the pivot" from "about the sprite centre" — which the capture did *not* settle, because `ptbase2`'s pivot is its centre. It also counts how far `pivot*2` is from the decoded size disc-wide (2 521 agree, 1 884 are off by more than 16 px), which demotes the "pivot is exactly half the texture" result to a property of the tutorial bundle.
839 lines
31 KiB
Rust
839 lines
31 KiB
Rust
//! UI screen layout — reassemble a whole UI screen from one RATC bundle.
|
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//!
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//! A UI screen ships as one pak (`GP_TITLE`, `GP_PAUSE_MENU`, `GP_HANGAR_ARSENAL`,
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//! …). Inside it, each top-level [RATC](crate::ratc) bundle is one
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||
//! *(context × language)* **build** of that screen, holding its `<name>.t32`
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//! sprites and `<name>.rat` layout records side by side.
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//!
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//! # The model
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//!
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//! The screen is **not** the set of `.rat` records — that was the first reading,
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||
//! and it misses every element that has no `.rat` (the `eff*` glow frames, the
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//! `deli*` dividers, `msg`). The screen is the bundle's own header:
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//!
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//! * the **element declaration table** at `0x20` (`0x14` = entry count, 60 bytes
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//! per entry) lists every element **in back-to-front draw order**, with its
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//! parent element index and its pivot;
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//! * the **placement region** that follows gives each element a keyframe group —
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//! a header of `(element index, keyframe count)` and then 40-byte keyframes of
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//! scale / tint / X / Y / time.
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//!
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//! Three traps, each of which cost a wrong answer before it was measured (see
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//! `docs/re/structures/ui-rat-layout.md`):
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//!
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//! * **X and Y are signed.** An Arsenal window animates in from X = −516; a
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//! parser reading them as `u32` throws that element away as out of range.
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//! * The trailing word of a keyframe is a **time**, not a fourth coordinate.
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//! * **Neither the first nor the last keyframe is where the element sits.** A
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//! group is an in → hold → out animation, so the resting position is the
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//! **max-dwell** keyframe — the one with the longest gap to the next keyframe's
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//! time. See [`Element::rest`].
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//!
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//! Validated against the running game: the tutorial PAUSE menu and the title main
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//! menu both rebuild pixel-accurately, and the Arsenal's eight category chips
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//! land within ±2 px (the only free parameter being emulator window chrome).
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use crate::{ratc, t8ad};
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use std::collections::HashMap;
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fn be32(b: &[u8], o: usize) -> u32 {
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if o + 4 > b.len() {
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return 0;
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}
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u32::from_be_bytes([b[o], b[o + 1], b[o + 2], b[o + 3]])
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}
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/// Offset of the element declaration table within a build bundle.
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const DECL_TABLE_AT: usize = 0x20;
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/// Bytes per declaration entry.
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const DECL_ENTRY: usize = 60;
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/// Bytes per placement keyframe.
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const KEYFRAME: usize = 40;
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/// The design space every screen is authored in.
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const DESIGN_W: u32 = 1280;
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const DESIGN_H: u32 = 720;
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/// One keyframe of an element's placement animation.
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///
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/// The block is 40 bytes:
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///
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/// ```text
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/// +0 u32 ARGB fade colour — alpha ramps 0x00 → 0x80 → 0xd5 … over the group
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/// +4 u32 0
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/// +8 u32 0
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/// +12 u32 0
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/// +16 u32 scale X, percent
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/// +20 u32 scale Y, percent
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/// +24 u32 tint (0xffff_ffff on every frame seen)
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/// +28 i32 X ← signed
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/// +32 i32 Y ← signed
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/// +36 u32 time
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/// ```
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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pub struct Keyframe {
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/// The fade colour, ARGB. Its alpha is what ramps an element in.
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pub fade: u32,
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/// Scale in percent (100 = 1:1).
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pub scale_x: u32,
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pub scale_y: u32,
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/// RGBA tint (`0xffff_ffff` = untinted).
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pub tint: u32,
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/// Top-left position in the design space. **Signed** — off-screen animation
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/// starts are negative.
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pub x: i32,
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pub y: i32,
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/// Keyframe time, or `None` for the group's **last** frame.
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///
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/// A group's data stops 4 bytes short of its final block's time slot — that
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/// word is already the next group's element index. Reading it anyway is
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/// where a stray `time = 1869640736` comes from, and it silently corrupts
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/// the max-dwell pick in [`Element::rest`].
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pub time: Option<u32>,
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}
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/// One element of a screen, in draw order.
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#[derive(Debug, Clone)]
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pub struct Element {
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/// Index into [`UiBuild::elements`] — also the key the placement region uses.
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pub index: usize,
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/// Declared name, e.g. `pgp_ttrl_eff10.t32` or `pgp_ttrl_btn10.rat`.
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pub name: String,
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/// The `.t32` sprite this element draws, if one resolves.
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pub sprite: Option<String>,
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/// Parent element index (`+32`), or `None` for `0xffff_ffff`.
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pub parent: Option<usize>,
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/// Kind flags (`+40`): `0` plain sprite, `1` has a parent, `0x4` a repeated
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/// instance of a template, `0x3002` a button record.
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pub kind: u32,
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/// Declared pivot — for a `.t32` element this is exactly half the decoded
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/// texture's dimensions (verified 7/7 on the tutorial bundle).
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pub pivot_x: u32,
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pub pivot_y: u32,
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/// The element's placement keyframes, empty if the region declares none.
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pub keyframes: Vec<Keyframe>,
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/// `opt ` link to another record — the focused state of a button.
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pub focus_link: Option<String>,
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/// This element is itself a focused-state record.
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pub focused: bool,
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/// A `loopN` sprite animation rather than a placed element.
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pub animated: bool,
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}
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impl Element {
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/// Where the element actually rests on screen.
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///
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/// A keyframe group is an in → hold → out animation, so the resting pose is
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/// neither the first nor the last frame: it is the one that **dwells
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/// longest** — the largest gap to the next keyframe's time. A single
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/// keyframe is its own rest position.
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pub fn rest(&self) -> Option<&Keyframe> {
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match self.keyframes.len() {
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0 => None,
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1 => self.keyframes.first(),
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n => {
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let mut best = (0usize, 0u32);
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for k in 0..n - 1 {
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let (Some(t0), Some(t1)) =
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(self.keyframes[k].time, self.keyframes[k + 1].time)
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else {
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continue; // the last frame carries no time
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};
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let dwell = t1.saturating_sub(t0);
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// `>=`, not `>`: on a tie take the LATER frame. A group is
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// in → hold → out, so when two gaps are equal the second is
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// the settled pose — `pgpmsg` holds 5 ticks at y=645 on the
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// way in and 5 more at y=605 where it stays, and `>` picks
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// the fly-through.
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if dwell >= best.1 {
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best = (k, dwell);
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}
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}
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self.keyframes.get(best.0)
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}
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}
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}
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}
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/// A parsed UI build: one screen layout (one context × language).
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pub struct UiBuild {
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/// Design-space dimensions, normally 1280×720.
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pub design_w: u32,
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pub design_h: u32,
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/// Every element, in the declaration table's back-to-front draw order.
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pub elements: Vec<Element>,
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/// Sprite name → (offset, size) of its `T8aD` child within the bundle.
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pub sprites: HashMap<String, (usize, usize)>,
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/// A guessed context from the sprite naming (e.g. `"tutorial"`), if any.
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pub context_hint: Option<String>,
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/// True when the declaration table was unusable and the build was recovered
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/// by scanning `.rat` records instead — placements are then per-record and
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/// `.rat`-less elements are missing.
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pub from_fallback: bool,
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/// Element indices in the order the placement region stores their keyframe
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/// groups. Each group names its element explicitly, so this *could* be a
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/// second, independent ordering — and therefore a candidate for the paint
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/// order the title screen needs. It is not: it equals the declaration order
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/// on every build on the disc. Kept, with
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/// `placement_region_order_is_never_a_second_ordering` guarding it, so the
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/// refutation stays checkable rather than remembered.
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pub placement_order: Vec<usize>,
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}
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/// Whether `bundle` is a RATC screen build (has at least one `.rat` layout child).
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pub fn is_build(bundle: &[u8]) -> bool {
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ratc::is_ratc(bundle)
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&& ratc::parse(bundle).is_some_and(|kids| {
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kids.iter()
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.any(|c| c.name.to_ascii_lowercase().ends_with(".rat"))
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})
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}
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/// Trim a NUL-padded fixed-width name field.
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fn fixed_name(b: &[u8]) -> String {
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let end = b.iter().position(|&c| c == 0).unwrap_or(b.len());
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String::from_utf8_lossy(&b[..end]).trim().to_string()
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}
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/// The `opt ` link inside a `.rat` record: a tag, a length, then the name.
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fn opt_link(rec: &[u8]) -> Option<String> {
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let pos = rec.windows(4).position(|w| w == b"opt ")?;
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let len = be32(rec, pos + 4) as usize;
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if len == 0 || len > 64 || pos + 8 + len > rec.len() {
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return None;
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}
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let s = fixed_name(&rec[pos + 8..pos + 8 + len]);
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(!s.is_empty()).then_some(s)
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}
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/// The sprite a `.rat` record places: a NUL-terminated name at `0x20`.
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///
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/// The field is **not** 16 bytes. Capping it there truncates every longer name —
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/// `pgp_ttrl_title.t32` becomes `pgp_ttrl_title.t`, which then resolves against
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/// nothing and silently drops the element from the composite. It runs up to the
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/// pivot words at `0x50`.
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fn record_sprite(rec: &[u8]) -> Option<String> {
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if rec.len() < 0x30 || rec[0..4] != *b"RATC" {
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return None;
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}
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let end = 0x50.min(rec.len());
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let s = fixed_name(&rec[0x20..end]);
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(!s.is_empty()).then_some(s)
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}
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/// Read the declaration table. `None` when it does not look like one.
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fn parse_decls(bundle: &[u8]) -> Option<Vec<Element>> {
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let count = be32(bundle, 0x14) as usize;
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// Guard: this parser runs over ~2 900 bundles, most of which are not screen
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// builds. A count that cannot fit is a mis-read, not a short table.
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if count == 0 || count > 4096 || DECL_TABLE_AT + count * DECL_ENTRY > bundle.len() {
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return None;
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}
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let mut elements = Vec::with_capacity(count);
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for i in 0..count {
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let e = &bundle[DECL_TABLE_AT + i * DECL_ENTRY..DECL_TABLE_AT + (i + 1) * DECL_ENTRY];
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let name = fixed_name(&e[..28]);
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// Every real declaration names something; a table of blanks means we are
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// reading past the header of a bundle that has no declaration table.
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if name.is_empty() {
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return None;
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}
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let parent = match be32(e, 32) {
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u32::MAX => None,
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p if (p as usize) < count => Some(p as usize),
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_ => None,
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};
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let lname = name.to_ascii_lowercase();
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elements.push(Element {
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index: i,
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name,
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sprite: None,
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parent,
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kind: be32(e, 40),
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pivot_x: be32(e, 48),
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pivot_y: be32(e, 52),
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keyframes: Vec::new(),
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focus_link: None,
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focused: lname.ends_with("f.rat") || lname.ends_with("f.t32"),
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animated: lname.contains("loop"),
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});
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}
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Some(elements)
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}
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/// Read the placement region that follows the declaration table, filling in each
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/// element's keyframe group.
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fn parse_placements(bundle: &[u8], elements: &mut [Element]) -> Vec<usize> {
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let count = elements.len();
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let mut order = Vec::with_capacity(count);
|
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let mut pos = DECL_TABLE_AT + count * DECL_ENTRY;
|
||
for _ in 0..count {
|
||
if pos + 8 > bundle.len() {
|
||
break;
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||
}
|
||
let idx = be32(bundle, pos) as usize;
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||
let frames = be32(bundle, pos + 4) as usize;
|
||
if idx >= count || frames == 0 || frames > 4096 {
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||
break;
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||
}
|
||
// Group header is (index, count) then one lead-in word; blocks follow.
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let first = pos + 12;
|
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// The region is packed so that the next group's header sits 4 bytes
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// inside the last block — i.e. the group owns `frames * 40 - 4` bytes of
|
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// block data, and the final block's time field is not its own.
|
||
let group_end = first + frames * KEYFRAME - 4;
|
||
let mut group = Vec::with_capacity(frames);
|
||
for k in 0..frames {
|
||
let blk = first + k * KEYFRAME;
|
||
if blk + 36 > bundle.len() || blk + 36 > group_end {
|
||
break;
|
||
}
|
||
group.push(Keyframe {
|
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fade: be32(bundle, blk),
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||
scale_x: be32(bundle, blk + 16),
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scale_y: be32(bundle, blk + 20),
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||
tint: be32(bundle, blk + 24),
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||
x: be32(bundle, blk + 28) as i32,
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||
y: be32(bundle, blk + 32) as i32,
|
||
// Only a block wholly inside the group carries a time.
|
||
time: (blk + 40 <= group_end).then(|| be32(bundle, blk + 36)),
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||
});
|
||
}
|
||
elements[idx].keyframes = group;
|
||
order.push(idx);
|
||
pos = group_end;
|
||
}
|
||
order
|
||
}
|
||
|
||
/// Parse a build bundle into its elements and sprite table.
|
||
pub fn parse_build(bundle: &[u8]) -> Option<UiBuild> {
|
||
let kids = ratc::parse(bundle)?;
|
||
let mut sprites = HashMap::new();
|
||
let mut records: HashMap<String, (usize, usize)> = HashMap::new();
|
||
for c in &kids {
|
||
let end = (c.offset + c.size).min(bundle.len());
|
||
if c.kind == "T8aD" {
|
||
sprites.insert(c.name.clone(), (c.offset, end - c.offset));
|
||
} else if c.name.to_ascii_lowercase().ends_with(".rat") {
|
||
records.insert(c.name.clone(), (c.offset, end - c.offset));
|
||
}
|
||
}
|
||
|
||
let (mut elements, from_fallback, placement_order) = match parse_decls(bundle) {
|
||
Some(mut els) => {
|
||
let order = parse_placements(bundle, &mut els);
|
||
(els, false, order)
|
||
}
|
||
// No usable declaration table: recover what the `.rat` records alone can
|
||
// say. Elements without a record (eff*/deli*/msg) are then missing, so
|
||
// callers are told via `from_fallback`.
|
||
None => {
|
||
let els = fallback_elements(bundle, &records);
|
||
let order = (0..els.len()).collect();
|
||
(els, true, order)
|
||
}
|
||
};
|
||
|
||
// Resolve each element to the sprite it draws, and pick up its focus link.
|
||
for el in &mut elements {
|
||
if let Some(&(off, size)) = records.get(&el.name) {
|
||
let rec = &bundle[off..off + size];
|
||
el.sprite = record_sprite(rec);
|
||
el.focus_link = opt_link(rec);
|
||
} else if sprites.contains_key(&el.name) {
|
||
el.sprite = Some(el.name.clone());
|
||
}
|
||
}
|
||
|
||
if elements.is_empty() {
|
||
return None;
|
||
}
|
||
// The design space is stated by any `.rat` record; every screen seen is
|
||
// 1280×720, which is also the fallback.
|
||
let (design_w, design_h) = records
|
||
.values()
|
||
.find_map(|&(off, size)| {
|
||
let r = &bundle[off..off + size];
|
||
let (w, h) = (be32(r, 0x18), be32(r, 0x1c));
|
||
(w > 0 && h > 0 && w <= 8192 && h <= 8192).then_some((w, h))
|
||
})
|
||
.unwrap_or((DESIGN_W, DESIGN_H));
|
||
|
||
let context_hint = sprites
|
||
.keys()
|
||
.find_map(|n| n.contains("ttrl").then(|| "tutorial".to_string()));
|
||
|
||
Some(UiBuild {
|
||
design_w,
|
||
design_h,
|
||
elements,
|
||
sprites,
|
||
context_hint,
|
||
from_fallback,
|
||
placement_order,
|
||
})
|
||
}
|
||
|
||
/// Recover elements from the `.rat` records when the declaration table is
|
||
/// unreadable: each record becomes an element with a single keyframe.
|
||
fn fallback_elements(bundle: &[u8], records: &HashMap<String, (usize, usize)>) -> Vec<Element> {
|
||
let mut names: Vec<&String> = records.keys().collect();
|
||
names.sort_by_key(|n| records[*n].0); // file order stands in for draw order
|
||
let mut out = Vec::new();
|
||
for name in names {
|
||
let (off, size) = records[name];
|
||
let rec = &bundle[off..off + size];
|
||
let Some((tint, x, y)) = scan_placement_block(rec) else {
|
||
continue;
|
||
};
|
||
let lname = name.to_ascii_lowercase();
|
||
out.push(Element {
|
||
index: out.len(),
|
||
name: name.clone(),
|
||
sprite: record_sprite(rec),
|
||
parent: None,
|
||
kind: 0,
|
||
pivot_x: be32(rec, 0x50),
|
||
pivot_y: be32(rec, 0x54),
|
||
keyframes: vec![Keyframe {
|
||
fade: 0xffff_ffff,
|
||
scale_x: 100,
|
||
scale_y: 100,
|
||
tint,
|
||
x,
|
||
y,
|
||
time: Some(0),
|
||
}],
|
||
focus_link: opt_link(rec),
|
||
focused: lname.ends_with("f.rat"),
|
||
animated: lname.contains("loop"),
|
||
});
|
||
}
|
||
for (i, el) in out.iter_mut().enumerate() {
|
||
el.index = i;
|
||
}
|
||
out
|
||
}
|
||
|
||
/// Find a `[scaleX=100, scaleY=100, tint, X, Y]` run inside a `.rat` record.
|
||
/// Records are tag-driven and variable-length, so this anchor beats a fixed
|
||
/// offset — it is only used on the fallback path.
|
||
fn scan_placement_block(rec: &[u8]) -> Option<(u32, i32, i32)> {
|
||
let mut o = 0x58;
|
||
while o + 20 <= rec.len() {
|
||
if be32(rec, o) == 100 && be32(rec, o + 4) == 100 {
|
||
let (tint, x, y) = (
|
||
be32(rec, o + 8),
|
||
be32(rec, o + 12) as i32,
|
||
be32(rec, o + 16) as i32,
|
||
);
|
||
if x > -4096 && x < 8192 && y > -4096 && y < 8192 {
|
||
return Some((tint, x, y));
|
||
}
|
||
}
|
||
o += 4;
|
||
}
|
||
None
|
||
}
|
||
|
||
/// A composited screen image ready to display.
|
||
pub struct ComposedScreen {
|
||
pub width: u32,
|
||
pub height: u32,
|
||
/// Row-major RGBA8.
|
||
pub rgba: Vec<u8>,
|
||
/// Indices of the elements actually drawn, in draw order.
|
||
pub drawn: Vec<usize>,
|
||
/// Elements skipped because their sprite could not be resolved or decoded.
|
||
pub missing: Vec<String>,
|
||
}
|
||
|
||
/// What to include when compositing.
|
||
#[derive(Debug, Clone, Copy)]
|
||
pub struct ComposeOptions {
|
||
/// Draw `*f` focused-state records over their base elements.
|
||
pub include_focus: bool,
|
||
/// Draw `loop*` sprite animations.
|
||
pub include_animated: bool,
|
||
/// Colour the canvas starts at. The default dim slate stands in for the
|
||
/// PRMD dim-quad plus the live 3D scene behind an in-mission screen; a
|
||
/// screen that carries its own full-screen background wants **black**,
|
||
/// which is what the game composites over — comparing a composite against a
|
||
/// framebuffer capture needs the backdrop to match, or every partially
|
||
/// transparent pixel is off by the backdrop.
|
||
pub backdrop: [u8; 4],
|
||
}
|
||
|
||
impl Default for ComposeOptions {
|
||
fn default() -> Self {
|
||
Self {
|
||
include_focus: false,
|
||
include_animated: false,
|
||
backdrop: [14, 14, 20, 255],
|
||
}
|
||
}
|
||
}
|
||
|
||
/// Composite a build into its screen image, using the default options.
|
||
pub fn compose_build(bundle: &[u8], include_focus: bool) -> Option<ComposedScreen> {
|
||
let build = parse_build(bundle)?;
|
||
Some(compose(
|
||
&build,
|
||
bundle,
|
||
ComposeOptions {
|
||
include_focus,
|
||
..Default::default()
|
||
},
|
||
None,
|
||
))
|
||
}
|
||
|
||
/// Composite a parsed build.
|
||
///
|
||
/// `visible`, when given, selects elements by index — the viewer uses it for
|
||
/// per-element toggles. Elements are drawn in declaration order, which is the
|
||
/// screen's own back-to-front order.
|
||
pub fn compose(
|
||
build: &UiBuild,
|
||
bundle: &[u8],
|
||
opts: ComposeOptions,
|
||
visible: Option<&[bool]>,
|
||
) -> ComposedScreen {
|
||
let (w, h) = (build.design_w, build.design_h);
|
||
// A dim backdrop stands in for the PRMD dim-quad + the live 3D scene behind
|
||
// an in-mission screen.
|
||
let mut canvas = vec![0u8; (w as usize) * (h as usize) * 4];
|
||
for px in canvas.chunks_exact_mut(4) {
|
||
px.copy_from_slice(&opts.backdrop);
|
||
}
|
||
let mut drawn = Vec::new();
|
||
let mut missing = Vec::new();
|
||
for el in &build.elements {
|
||
if let Some(v) = visible {
|
||
if !v.get(el.index).copied().unwrap_or(true) {
|
||
continue;
|
||
}
|
||
}
|
||
if (el.animated && !opts.include_animated) || (el.focused && !opts.include_focus) {
|
||
continue;
|
||
}
|
||
let Some(kf) = el.rest() else { continue };
|
||
let Some(sprite) = el.sprite.as_ref() else {
|
||
continue;
|
||
};
|
||
let Some(&(off, size)) = build.sprites.get(sprite) else {
|
||
missing.push(sprite.clone());
|
||
continue;
|
||
};
|
||
let Some(img) = t8ad::parse(&bundle[off..off + size]) else {
|
||
missing.push(sprite.clone());
|
||
continue;
|
||
};
|
||
blit(&mut canvas, w, h, &img, kf, el.pivot_x, el.pivot_y);
|
||
drawn.push(el.index);
|
||
}
|
||
ComposedScreen {
|
||
width: w,
|
||
height: h,
|
||
rgba: canvas,
|
||
drawn,
|
||
missing,
|
||
}
|
||
}
|
||
|
||
/// Alpha-blend one sprite onto the canvas at a keyframe's placement, with tint
|
||
/// and scale. Placements may be negative or run off the edge, so both axes clip.
|
||
///
|
||
/// **A keyframe's X/Y is the element's top-left at 1:1, and scale grows it about
|
||
/// the declared pivot, not about that corner.** Measured against a framebuffer
|
||
/// capture of the running title screen: `ptbase2.t32` is a 640×360 background
|
||
/// placed at (320,180) with `scale = 200%` and pivot (320,180). Growing from the
|
||
/// corner puts it at 320..1600 × 180..900 — a quarter-screen slab. Anchoring the
|
||
/// pivot gives top-left `(320,180) − (320,180)·(2−1) = (0,0)` and a 1280×720
|
||
/// rect, which is what the game draws. At 100 % the pivot cancels, which is why
|
||
/// every unscaled element — and so every ruler this format was checked against —
|
||
/// was unaffected. See `docs/re/structures/ui-rat-layout.md`.
|
||
fn blit(
|
||
canvas: &mut [u8],
|
||
cw: u32,
|
||
ch: u32,
|
||
img: &t8ad::T8adImage,
|
||
kf: &Keyframe,
|
||
pivot_x: u32,
|
||
pivot_y: u32,
|
||
) {
|
||
let (sw, sh) = (img.width, img.height);
|
||
if sw == 0 || sh == 0 {
|
||
return;
|
||
}
|
||
let sx_pct = if kf.scale_x == 0 { 100 } else { kf.scale_x };
|
||
let sy_pct = if kf.scale_y == 0 { 100 } else { kf.scale_y };
|
||
let dw = (sw * sx_pct / 100).max(1);
|
||
let dh = (sh * sy_pct / 100).max(1);
|
||
// Keep the pivot point fixed as the element scales.
|
||
let ox = kf.x - (pivot_x as i32 * (sx_pct as i32 - 100)) / 100;
|
||
let oy = kf.y - (pivot_y as i32 * (sy_pct as i32 - 100)) / 100;
|
||
let (tr, tg, tb, ta) = (
|
||
(kf.tint >> 24) & 0xff,
|
||
(kf.tint >> 16) & 0xff,
|
||
(kf.tint >> 8) & 0xff,
|
||
kf.tint & 0xff,
|
||
);
|
||
for row in 0..dh {
|
||
let ty = oy + row as i32;
|
||
if ty < 0 {
|
||
continue;
|
||
}
|
||
if ty >= ch as i32 {
|
||
break;
|
||
}
|
||
let syi = (row * sh / dh).min(sh - 1);
|
||
for col in 0..dw {
|
||
let tx = ox + col as i32;
|
||
if tx < 0 {
|
||
continue;
|
||
}
|
||
if tx >= cw as i32 {
|
||
break;
|
||
}
|
||
let sxi = (col * sw / dw).min(sw - 1);
|
||
let si = ((syi * sw + sxi) * 4) as usize;
|
||
if si + 3 >= img.rgba.len() {
|
||
continue;
|
||
}
|
||
let sr = img.rgba[si] as u32 * tr / 255;
|
||
let sg = img.rgba[si + 1] as u32 * tg / 255;
|
||
let sb = img.rgba[si + 2] as u32 * tb / 255;
|
||
let sa = img.rgba[si + 3] as u32 * ta / 255;
|
||
if sa == 0 {
|
||
continue;
|
||
}
|
||
let di = ((ty as u32 * cw + tx as u32) * 4) as usize;
|
||
for (k, sc) in [sr, sg, sb].into_iter().enumerate() {
|
||
let dc = canvas[di + k] as u32;
|
||
canvas[di + k] = ((sc * sa + dc * (255 - sa)) / 255) as u8;
|
||
}
|
||
canvas[di + 3] = 255;
|
||
}
|
||
}
|
||
}
|
||
|
||
#[cfg(test)]
|
||
mod tests {
|
||
use super::*;
|
||
|
||
/// A synthetic build bundle: RATC magic, entry count at 0x14, a declaration
|
||
/// table at 0x20, then a placement region.
|
||
fn synth_build(decls: &[(&str, u32, u32, u32, u32)], groups: &[(usize, Vec<Keyframe>)]) -> Vec<u8> {
|
||
let count = decls.len();
|
||
let mut b = vec![0u8; DECL_TABLE_AT + count * DECL_ENTRY];
|
||
b[0..4].copy_from_slice(b"RATC");
|
||
b[0x14..0x18].copy_from_slice(&(count as u32).to_be_bytes());
|
||
for (i, &(name, parent, kind, px, py)) in decls.iter().enumerate() {
|
||
let at = DECL_TABLE_AT + i * DECL_ENTRY;
|
||
b[at..at + name.len()].copy_from_slice(name.as_bytes());
|
||
b[at + 32..at + 36].copy_from_slice(&parent.to_be_bytes());
|
||
b[at + 40..at + 44].copy_from_slice(&kind.to_be_bytes());
|
||
b[at + 48..at + 52].copy_from_slice(&px.to_be_bytes());
|
||
b[at + 52..at + 56].copy_from_slice(&py.to_be_bytes());
|
||
}
|
||
for (idx, frames) in groups {
|
||
let start = b.len();
|
||
b.extend_from_slice(&(*idx as u32).to_be_bytes());
|
||
b.extend_from_slice(&(frames.len() as u32).to_be_bytes());
|
||
b.resize(start + 12, 0); // header + one lead-in word
|
||
for kf in frames {
|
||
b.extend_from_slice(&kf.fade.to_be_bytes());
|
||
b.extend_from_slice(&[0u8; 12]);
|
||
b.extend_from_slice(&kf.scale_x.to_be_bytes());
|
||
b.extend_from_slice(&kf.scale_y.to_be_bytes());
|
||
b.extend_from_slice(&kf.tint.to_be_bytes());
|
||
b.extend_from_slice(&kf.x.to_be_bytes());
|
||
b.extend_from_slice(&kf.y.to_be_bytes());
|
||
b.extend_from_slice(&kf.time.unwrap_or(0).to_be_bytes());
|
||
}
|
||
// The next group's header overlaps the last block's time slot.
|
||
b.truncate(b.len() - 4);
|
||
}
|
||
b
|
||
}
|
||
|
||
fn kf(x: i32, y: i32, time: u32) -> Keyframe {
|
||
Keyframe {
|
||
fade: 0xffff_ffff,
|
||
scale_x: 100,
|
||
scale_y: 100,
|
||
tint: 0xffff_ffff,
|
||
x,
|
||
y,
|
||
time: Some(time),
|
||
}
|
||
}
|
||
|
||
#[test]
|
||
fn reads_declaration_table_in_draw_order() {
|
||
let b = synth_build(
|
||
&[
|
||
("pgpeff02.t32", u32::MAX, 0, 204, 60),
|
||
("pgpeff02a.t32", 0, 1, 100, 40),
|
||
("pgpbtn00.rat", u32::MAX, 0x3002, 64, 16),
|
||
],
|
||
&[],
|
||
);
|
||
let els = parse_decls(&b).unwrap();
|
||
assert_eq!(els.len(), 3);
|
||
assert_eq!(els[0].name, "pgpeff02.t32");
|
||
assert_eq!(els[0].parent, None);
|
||
// `+32` is a parent element index: the `…a` variant names its base.
|
||
assert_eq!(els[1].parent, Some(0));
|
||
assert_eq!(els[1].kind, 1);
|
||
assert_eq!(els[2].kind, 0x3002);
|
||
assert_eq!((els[0].pivot_x, els[0].pivot_y), (204, 60));
|
||
}
|
||
|
||
#[test]
|
||
fn placement_x_and_y_are_signed() {
|
||
// The Arsenal window animates in from X = -516; read as u32 it would be
|
||
// ~4.29 billion and the element would be discarded.
|
||
let b = synth_build(
|
||
&[("aswindow.t32", u32::MAX, 0, 0, 0)],
|
||
&[(0, vec![kf(-516, 40, 0), kf(120, 40, 30)])],
|
||
);
|
||
let mut els = parse_decls(&b).unwrap();
|
||
parse_placements(&b, &mut els);
|
||
assert_eq!(els[0].keyframes.len(), 2);
|
||
assert_eq!(els[0].keyframes[0].x, -516);
|
||
assert_eq!(els[0].keyframes[1].x, 120);
|
||
}
|
||
|
||
#[test]
|
||
fn rest_is_the_max_dwell_keyframe_not_the_first_or_last() {
|
||
// in (t=0) → hold (t=10..90) → out (t=100): the resting pose is the
|
||
// middle frame, which both "first" and "last" would get wrong.
|
||
let el = Element {
|
||
index: 0,
|
||
name: "x.t32".into(),
|
||
sprite: None,
|
||
parent: None,
|
||
kind: 0,
|
||
pivot_x: 0,
|
||
pivot_y: 0,
|
||
keyframes: vec![kf(-500, 10, 0), kf(226, 268, 10), kf(900, 268, 90)],
|
||
focus_link: None,
|
||
focused: false,
|
||
animated: false,
|
||
};
|
||
let r = el.rest().unwrap();
|
||
assert_eq!((r.x, r.y), (226, 268));
|
||
}
|
||
|
||
#[test]
|
||
fn single_keyframe_is_its_own_rest() {
|
||
let el = Element {
|
||
index: 0,
|
||
name: "x.t32".into(),
|
||
sprite: None,
|
||
parent: None,
|
||
kind: 0,
|
||
pivot_x: 0,
|
||
pivot_y: 0,
|
||
keyframes: vec![kf(546, 288, 0)],
|
||
focus_link: None,
|
||
focused: false,
|
||
animated: false,
|
||
};
|
||
assert_eq!(el.rest().map(|k| (k.x, k.y)), Some((546, 288)));
|
||
}
|
||
|
||
#[test]
|
||
fn rejects_a_bundle_with_no_declaration_table() {
|
||
let mut b = vec![0u8; 0x400];
|
||
b[0..4].copy_from_slice(b"RATC");
|
||
b[0x14..0x18].copy_from_slice(&999_999u32.to_be_bytes()); // cannot fit
|
||
assert!(parse_decls(&b).is_none());
|
||
}
|
||
|
||
#[test]
|
||
fn opt_link_reads_the_focus_record() {
|
||
let mut r = vec![0u8; 0x60];
|
||
r[0..4].copy_from_slice(b"RATC");
|
||
r[0x20..0x20 + 12].copy_from_slice(b"pgpbtn00.t32");
|
||
r.extend_from_slice(b"opt ");
|
||
r.extend_from_slice(&13u32.to_be_bytes());
|
||
r.extend_from_slice(b"pgpbtn00f.rat");
|
||
assert_eq!(record_sprite(&r).as_deref(), Some("pgpbtn00.t32"));
|
||
assert_eq!(opt_link(&r).as_deref(), Some("pgpbtn00f.rat"));
|
||
}
|
||
|
||
#[test]
|
||
fn scaling_grows_about_the_pivot_not_the_corner() {
|
||
// Measured against the real title screen: `ptbase2.t32` is 640x360 with
|
||
// pivot (320,180), placed at (320,180) with scale 200%. The game draws
|
||
// it as the full-screen background — top-left (0,0), 1280x720. Growing
|
||
// from the keyframe corner instead paints a quarter-screen slab and
|
||
// leaves the top-left quadrant bare. See
|
||
// `docs/re/structures/ui-rat-layout.md`.
|
||
let img = t8ad::T8adImage {
|
||
width: 640,
|
||
height: 360,
|
||
rgba: vec![255u8; 640 * 360 * 4],
|
||
};
|
||
let k = Keyframe {
|
||
fade: 0xffff_ffff,
|
||
scale_x: 200,
|
||
scale_y: 200,
|
||
tint: 0xffff_ffff,
|
||
x: 320,
|
||
y: 180,
|
||
time: None,
|
||
};
|
||
let (w, h) = (1280u32, 720u32);
|
||
let mut canvas = vec![0u8; (w * h * 4) as usize];
|
||
blit(&mut canvas, w, h, &img, &k, 320, 180);
|
||
// Every pixel is covered; the four corners are the cheap witnesses.
|
||
for (x, y) in [(0, 0), (w - 1, 0), (0, h - 1), (w - 1, h - 1)] {
|
||
let i = ((y * w + x) * 4) as usize;
|
||
assert_eq!(
|
||
canvas[i], 255,
|
||
"pixel ({x},{y}) not covered — the background is not full-screen"
|
||
);
|
||
}
|
||
}
|
||
|
||
#[test]
|
||
fn a_hundred_percent_element_lands_on_its_keyframe_corner() {
|
||
// The other half of the rule, and the reason the corner reading survived
|
||
// this long: at 100% the pivot cancels, so no unscaled element moves.
|
||
// `ptcopyright.t32` is 694x20 at (293,655), and the capture's glyph run
|
||
// starts at x = 295 — inside that rect, not offset by a pivot.
|
||
let img = t8ad::T8adImage {
|
||
width: 694,
|
||
height: 20,
|
||
rgba: vec![255u8; 694 * 20 * 4],
|
||
};
|
||
let k = kf(293, 655, 0);
|
||
let (w, h) = (1280u32, 720u32);
|
||
let mut canvas = vec![0u8; (w * h * 4) as usize];
|
||
blit(&mut canvas, w, h, &img, &k, 309, 10);
|
||
let at = |x: u32, y: u32| canvas[((y * w + x) * 4) as usize];
|
||
assert_eq!(at(293, 655), 255, "top-left corner is the keyframe");
|
||
assert_eq!(at(986, 674), 255, "bottom-right corner is corner + size");
|
||
assert_eq!(at(292, 655), 0, "nothing left of the keyframe X");
|
||
assert_eq!(at(293, 654), 0, "nothing above the keyframe Y");
|
||
}
|
||
|
||
#[test]
|
||
fn fallback_scans_records_when_the_table_is_unusable() {
|
||
// The old `.rat`-only reading, kept as a recovery path.
|
||
let mut r = vec![0u8; 0x58];
|
||
r[0..4].copy_from_slice(b"RATC");
|
||
r[0x18..0x1c].copy_from_slice(&1280u32.to_be_bytes());
|
||
r[0x1c..0x20].copy_from_slice(&720u32.to_be_bytes());
|
||
r[0x20..0x20 + 12].copy_from_slice(b"pgpbtn00.t32");
|
||
for v in [100u32, 100, 0xffff_ffff, 226, 268] {
|
||
r.extend_from_slice(&v.to_be_bytes());
|
||
}
|
||
assert_eq!(scan_placement_block(&r), Some((0xffff_ffff, 226, 268)));
|
||
}
|
||
}
|