fabi/Sylpheed
1
0
Fork 0
Code Issues 9 Pull Requests Actions Packages Projects Releases Wiki Activity

re: the paint-order tie-break costs one pixel, on one screen we do not ship

Browse Source 
Closes the open half of Q3. `ui-paint-order-derived-check.md` bounded WHERE a
wrong tie-break could show -- overlapping same-key pairs -- and said outright
that nobody had measured how many change a pixel.

At the instant the player sees, the answer is: at most 1 px at max channel
difference 1, on the JAPANESE title only (`ptlogo2` x `ptlogo_tm`, 5 px of
shared ink). Exactly 0 px on all five port screens.

The earlier 24-pair bound was counted at `rest()`, and 10 of the title's 11
overlapping tied pairs are between `ptlogo_back2eff1`..`eff5` -- the five
transient flashes from the settle-time finding, transparent on the settled
screen. A tie between two invisible elements cannot cost a pixel.

Not a knife-edge. Sweeping every keyframe time and every midpoint between
keyframe times, the live-pair count is flat across the ENTIRE settle window:
1 on the EN title, 2 on the JP title, 0 on all four loading bundles -- whose
tie is live only at t17..t33, during the build-in, which matters because
their settle windows are narrow enough to deserve little trust otherwise.

Controls: every entry reporting zero also swaps an overlapping DIFFERENT-key
pair, which must and does move pixels (25 310 / 268 698 / ~765 000 px). Zeros
are explained by shared-ink counts rather than asserted -- the `ptframe` pairs
overlap by bounding box and share 0 px of ink. Entries 0/1/12/15 have NO live
control and their zeros rest on keyframe data rather than a render; recorded
as the weaker claim it is.

Refutation attempt on the corpus's "24 overlapping pairs": it SURVIVES as a
rest-pose count -- an independent recount reproduces entry 7's 16 exactly.
What is overturned is its interpretation as the risk surface.

`tie_break_pixel_cost` gains a settle-time case and an alpha/scale filter on
its rect test; `tie_cost_over_time` is new. Also strips 611 bytes of captured
cargo warnings from the head of the committed tie census.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QsEPXWVaEpyfudtR6re1Pd
This commit is contained in:
sylph-decoder
2026-08-29 19:35:29 +00:00
parent 6f4ba93c5c
commit 3e731c68ce
9 changed files with 470 additions and 36 deletions
Download Patch File Download Diff File Expand all files Collapse all files

33
docs/port/HANDOFF.md
View File

@@ -1749,7 +1749,7 @@ here until 2026-08-28 and is now settled.)
|---|---|---|
| 🟡 | **cue NAME → event binding** (Q8) | event→**wave** is measured for move/confirm/back; that the cursor's wave is the cue *named* `SE_UI_CURSOR` is still read off the authors' identifiers |
| ❔ | **the other ~319 SE cues** (Q8) | located one at a time by triggering them; only the three the menu needs have been done |
| ✅→🟡 | **the paint-order tie-break** (Q3) | ✅ **Its COST is now measured and it is zero on all five port screens** (2026-08-29) — the tied `ptframe` pairs share no ink, and the worst tie-break effect anywhere in `GP_TITLE` is Δ3/255. What stays open is only *why* the game orders ties as it does. Eight candidates refuted. 🔴 **The cost was understated and is corrected 2026-08-29** — the port challenged it and was right. Over all 16 `GP_TITLE` entries: 5 use a **measured** order and carry no tie risk; the other 11 fall back to the derived order and **7 of them have overlapping ties, 24 pairs in total** — 16 of those on the **Japanese title** (entry 7) alone, 2 each on `EXTRAS` EN/JP, 1 each on the four loading bundles. ⚠️ Overlap bounds *where* a wrong tie-break could show; nobody has measured how many actually change a pixel — [`ui-paint-order-derived-check.md`](../re/structures/ui-paint-order-derived-check.md) · [census](../re/data/paint-order-ties-gp_title.txt) |
| ✅ | **the paint-order tie-break** (Q3) | ✅ **CLOSED 2026-08-29 — the cost is measured and it is one pixel.** At the instant the player sees, the tie-break changes **at most 1 px at Δ1**, on the **Japanese title only**; **exactly 0 px on all five screens you ship**. The previous 24-pair bound was a `rest()` count and survives as such (entry 7's 16 reproduces exactly), but 10 of the title's 11 tied pairs are between `ptlogo_back2eff1`…`eff5` — five transient flashes that are **transparent** on the settled screen. Not a knife-edge: the live-pair count is flat across the whole settle window, and the loading bundles' tie is live only during the build-in (t17–t33). Controls live on every entry reporting zero (a different-key swap moves 25 310 / 268 698 / ~765 000 px); ⚠️ except entries 0/1/12/15, whose zeros rest on keyframe data rather than a render. ❔ *Why* the game orders ties as it does is still unknown — and now costs one pixel — [`ui-tie-break-cost-at-settle.md`](../re/structures/ui-tie-break-cost-at-settle.md) · [cost run](../re/data/tie-break-pixel-cost-gp_title.txt) · [time sweep](../re/data/tie-break-live-over-time-gp_title.txt) |
| 🟡 | **GamePart ids behind the buttons** (Q4) | the *screens* are measured; the ids are a name match onto the executable's class names |
| 🟡 | **the boot transitions in code** (Q6) | both levels decoded — phase at `this+132` (`entry→2`, `2→0`, `2→3`, `3→4`, `4→2`) and state at `this+136` inside phase 4. Phase 0 = splash (`LOGO`), phase 2 = title + `PRESS Ⓐ`, phase 4 = menu. Unknown: what the event *numbers* mean |
| 🟡 | **Ⓑ leaving the main menu** (Q5) | **upgraded 2026-08-29 (later).** The idle half of this objection is **refuted**: the main menu does not self-return for **≥ 60 s** untouched, and the ~8–10 s idle belongs to the **title**. Ⓑ is delivered (Canary logs `vk=5801`) and is the only input in ≥ 100 s before the return, so the **ordering is measured**; the latency is not (a backlogged probe void). The footer point stands — the main menu is still the only screen not advertising Ⓑ — [`menu-navigation-semantics.md`](../re/menu-navigation-semantics.md#-refutation-attempt-2026-08-29--the-main-menus-own-footer-does-not-advertise-ⓑ) |
@@ -1839,3 +1839,34 @@ at that document's own pre-change tag and 14.07 today. Treat conclusions resting
on it as unverified.
Detail, controls and census: [`docs/re/structures/ui-settle-time.md`](../re/structures/ui-settle-time.md).
## 2026-08-29 (later) — Q3's last open half is closed: the tie-break costs one pixel
✅ **You can stop worrying about the paint-order tie-break.** Its cost is now
measured rather than bounded, and on the five screens you ship it is **zero
pixels**. The single non-zero anywhere in `GP_TITLE` is **1 pixel at Δ1** on the
**Japanese** title, where `ptlogo2` and `ptlogo_tm` share 5 pixels of ink.
**Why the earlier 24-pair figure looked alarming.** It was counted at `rest()`,
and 10 of the title's 11 overlapping tied pairs are between
`ptlogo_back2eff1`…`eff5` — the five transient flashes from the settle-time
finding, which are **transparent on the settled screen**. A tie between two
invisible elements cannot cost a pixel. The 24 itself is not wrong; it is a
rest-pose upper bound, and I reproduced its entry-7 component (16) exactly.
**It does not hinge on picking one instant.** Sweeping every keyframe time and
every midpoint, the number of live tied pairs is **flat across the entire settle
window** — 1 on the EN title, 2 on the JP title, 0 on all four loading bundles,
whose tie is live only at t17–t33 during the build-in.
⚠️ **One honest gap:** entries 0, 1, 12 and 15 report zero with **no live
control** — no overlapping different-key pair is drawn there, so nothing
demonstrates the renderer would notice a swap on those bundles. Their zeros come
from the keyframe data (no tied pair has both elements opaque at any instant in
the window), which is why I state them, but they are a weaker kind of zero than
the other six.
❔ **Still unknown:** *why* the game orders ties as it does. Eight candidate rules
remain refuted. This finding does not answer it — it makes it cheap to get wrong.
Detail, controls and reach: [`docs/re/structures/ui-tie-break-cost-at-settle.md`](../re/structures/ui-tie-break-cost-at-settle.md).

1
docs/re/INDEX.md
View File

@@ -168,3 +168,4 @@ files, which is how the same ground got covered twice.
| [`title-plate-delay-measured.md`](title-plate-delay-measured.md) | How long the boot title shows build 4 before the `PRESS Ⓐ` plate | ✅ **decoded after a refutation**: build 2 and build 4 run on **one clock started together**, and the plate's own `ptbtn00` reaches `a=255` at `t=238`; the last build-in ramp ends at `t=118`, so the interval is a declared **120 units = 2.000 s**. 🔴 The instruction that shipped first — "wait 2.13 s after build 4 settles" — was **refuted by the port** with disc arithmetic and is corrected in place; 🔴 `rest.t` is **not** when a screen settles (it is the last hold keyframe before the exit: `ptlogo1` rests at `t=251` and stops moving at `t=42`). ⚠️ The wall-clock 2.13 s is 6.7 % long because Canary presents at **28.06 / 28.14 fps** against a nominal 30, matching the corpus's independent **28.5 fps**; author the 120 units. ✅ **measured**, two independent boots: **2.138 s** and **2.132 s** from the frame build 4 settles (glyph = its no-plate 154, motion → 0). Agreeing to **6 ms**. So the boot title's end state is **not** plate-free and a compositor must draw **two builds at once**. ⚠️ Measure from *settled*, not from first pixels — "first drawn → plate" is 3.78 s vs 4.26 s across the same two runs, because the build-in animation's own duration varies with emulator frame pacing. Plate pulse re-measured at 2.12/2.19/2.34/2.31 s (mean 2.24), replicating the corpus's ≈2.3 s. ✅ black hold between screens bracketed at **0.14–0.30 s**, consistent with the declared 12 units. 🔴 the Ⓐ→menu latency is still **not** available: both runs freeze one frame for ~1.4 s at surface mean **26.626** — agreeing between runs to 1e-6, and reproduced with stream restarts disabled — which is a guest **load stall**, not the capture path. Probe: 8.7 ms/frame, 7.97/7.98 fps against a requested 8, controls 9/9 + 4/4 |
| [`menu-idle-and-b-2026-08-29.md`](menu-idle-and-b-2026-08-29.md) | The main menu does not idle back to the title — and four durations that were a pipeline | ✅ **refuted**: no self-return in **≥ 60 s** untouched; the ~8–10 s idle belongs to the **title**. 🟡 Ⓑ→title ordering measured, latency not. 🔴 `classify_array` at **1503 ms/frame** drained an 8 fps stream at 0.64 fps and manufactured four latencies (24.66 s / 15.58 s / 25.60 s / 20.26 s) — all withdrawn; a backlog preserves ordering and destroys durations |
| [`structures/ui-settle-time.md`](structures/ui-settle-time.md) | Which instant a "settled screen" composite depicts | ✅ **decoded**: a settled screen is **one instant every element is posed at**, and the disc names it — the midpoint of the **longest keyframe-free interval** in the build (`UiBuild::settle_time` / `settle_window`). 🔴 `rest()` is *not* that: it picks each element's last hold **independently**, so a two-frame flash holds at its **peak** and burns forever. `GP_TITLE` build 4 has five staggered flashes (`ptlogo_back2eff1`…`eff5`, all extinguished by t110) that `rest()` draws simultaneously and permanently, saturating the light arc. Predicted t=198 from `[160,236]` **before scoring**: arc band **33.22 → 11.79**, clipped pixels **8 581 → 1 452** against the console's **1 459** (an unfitted statistic), whole frame 14.07 → 12.06; controls at t=100 and t=358 are far worse, and a hand-picked visibility list reaches the identical 12.06/11.79/1 452. Controls: `at=None` byte-identical (`cmp`), pre- and post-rotation tags both 14.07, 13 paint-order tests green. ⚠️ **Reach**: of 1 758 bundles with ≥2 keyframe times only **30 %** have a window ≥ 30 units and **42 %** under 10 — mostly `loop*` fragments that never settle; check the width. 🔴 Withdraws two claims in [`ui-rotation-implemented.md`](structures/ui-rotation-implemented.md) — its "Flat. No minimum." (`at` posed **leaves only**) and its "Reborn does not draw `ptlogo1`/`ptlogo2`" (both **are** drawn; only kind-`0x4` ghosts are skipped, and hiding the real ones makes the error *worse* by +5.20/+7.47). ❔ its **10.92** baseline is unreproducible — 14.07 at both tags |
| [`structures/ui-tie-break-cost-at-settle.md`](structures/ui-tie-break-cost-at-settle.md) | What the unknown paint-order tie-break costs, in pixels | ✅ **decoded**, closing the open half of Q3: at the settled instant the tie-break costs **at most 1 px at Δ1**, on the **Japanese title only** (`ptlogo2`×`ptlogo_tm`, 5 px shared ink); **exactly 0 px on all five port screens**. The earlier 24-pair bound was a `rest()` count — and 10 of the title's 11 tied pairs are between `ptlogo_back2eff1`…`eff5`, five transient flashes that are **transparent** on the settled screen ([`ui-settle-time.md`](structures/ui-settle-time.md)). Live pairs at settle: entry 4 → **1**, entry 7 → **2**, the four loading bundles → **0**. ✅ Not a knife-edge — sweeping every keyframe time and midpoint, the count is **flat across the whole settle window**, and the loading bundles' tie is live only at t17–t33. ✅ Controls: an overlapping *different*-key swap moves 25 310 / 268 698 / ~765 000 px on the entries reporting zero; zeros are explained by shared-ink counts (the `ptframe` pairs share **0 px** of ink). ⚠️ Entries 0/1/12/15 have **no live control** — their zeros rest on keyframe data, not a render. 🟡 Refutation attempt on the corpus's "24 pairs": **survives** as a rest-pose bound, 16/16 on entry 7. ❔ *Why* ties order as they do is still unknown — and now worth one pixel |

18
docs/re/data/paint-order-ties-gp_title.txt
View File

@@ -1,21 +1,3 @@
warning: unused variable: `decl`
--> crates/sylpheed-formats/src/mesh.rs:1682:9
|
1682 | let decl = &decls[0];
| ^^^^ help: if this is intentional, prefix it with an underscore: `_decl`
|
= note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
warning: variable does not need to be mutable
--> crates/sylpheed-formats/src/ship_capture.rs:290:9
|
290 | let mut flush = |base: u32,
| ----^^^^^
| |
| help: remove this `mut`
|
= note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
entry 0 (no measured order) 7 elements, 2 tied pairs, 1 of them OVERLAPPING
overlapping tie: [5] pgloading_eff01.t32 x [6] pgloading_eff02.t32 key 49408 rect (202, 528, 332, 144) / (74, 518, 188, 186) overlap 60x144
entry 1 (no measured order) 7 elements, 2 tied pairs, 1 of them OVERLAPPING

22
docs/re/data/tie-break-live-over-time-gp_title.txt Normal file
View File

@@ -0,0 +1,22 @@
# tied pairs that could cost a pixel, over time — /disc/dat/GP_TITLE.pak
entry 0 peak 1 live pair(s) over t=0..40 settle window [34,38] at t=36: 0 ACROSS THE WHOLE WINDOW: max 0
live only at t17:1 t18:1 t19:1 t20:1 t21:1 t22:1 t23:1 t24:1 t25:1 t26:1 t27:1 t28:1 t30:1 t32:1 t33:1
entry 1 peak 1 live pair(s) over t=0..40 settle window [34,38] at t=36: 0 ACROSS THE WHOLE WINDOW: max 0
live only at t17:1 t18:1 t19:1 t20:1 t21:1 t22:1 t23:1 t24:1 t25:1 t26:1 t27:1 t28:1 t30:1 t32:1 t33:1
entry 4 peak 6 live pair(s) over t=0..269 settle window [160,236] at t=198: 1 ACROSS THE WHOLE WINDOW: max 1
live at 62 of 88 sampled instants
entry 5 peak 2 live pair(s) over t=0..80 settle window [44,56] at t=50: 2 ACROSS THE WHOLE WINDOW: max 2
live at 47 of 47 sampled instants
entry 6 peak 2 live pair(s) over t=0..74 settle window [38,50] at t=44: 2 ACROSS THE WHOLE WINDOW: max 2
live at 46 of 46 sampled instants
entry 7 peak 6 live pair(s) over t=0..269 settle window [190,236] at t=213: 2 ACROSS THE WHOLE WINDOW: max 2
live at 92 of 117 sampled instants
entry 8 peak 2 live pair(s) over t=0..80 settle window [44,56] at t=50: 2 ACROSS THE WHOLE WINDOW: max 2
live at 47 of 47 sampled instants
entry 9 peak 2 live pair(s) over t=0..74 settle window [38,50] at t=44: 2 ACROSS THE WHOLE WINDOW: max 2
live at 46 of 46 sampled instants
entry 12 peak 1 live pair(s) over t=0..48 settle window [40,48] at t=44: 0 ACROSS THE WHOLE WINDOW: max 0
live only at t17:1 t18:1 t19:1 t20:1 t21:1 t22:1 t23:1 t24:1 t25:1 t26:1 t27:1 t28:1 t30:1 t32:1 t33:1
entry 15 peak 1 live pair(s) over t=0..48 settle window [40,48] at t=44: 0 ACROSS THE WHOLE WINDOW: max 0
live only at t17:1 t18:1 t19:1 t20:1 t21:1 t22:1 t23:1 t24:1 t25:1 t26:1 t27:1 t28:1 t30:1 t32:1 t33:1

142
docs/re/data/tie-break-pixel-cost-gp_title.txt Normal file
View File

@@ -0,0 +1,142 @@
# tie-break pixel cost — /disc/dat/GP_TITLE.pak
entry 0 7 elements 1 overlapping tied pair(s) at rest settle t=36 (window 4 units)
[default (what `screen render` draws)] CONTROL UNAVAILABLE: no overlapping different-key pair is drawn
[default (what `screen render` draws)] [5] pgloading_eff01.t32 x [6] pgloading_eff02.t32 (key 49408): 1761 px differ (0.1911% of frame), max Δ 1 | ink 30864 / 21163 px, shared 3298 px
[everything on (focus+animated+primitives)] CONTROL ok: swapping [4] pgloading_loop4.rat x [6] pgloading_eff02.t32 moves 3654 px (max Δ 23)
[everything on (focus+animated+primitives)] [5] pgloading_eff01.t32 x [6] pgloading_eff02.t32 (key 49408): 1610 px differ (0.1747% of frame), max Δ 1 | ink 29173 / 21017 px, shared 3139 px
[AT THE SETTLE TIME (what the player sees)] 🔴 1 of the 1 tied pairs are GONE at this pose (an element is transparent or collapsed there) — they cannot cost a pixel
[AT THE SETTLE TIME (what the player sees)] CONTROL UNAVAILABLE: no overlapping different-key pair is drawn
entry 1 7 elements 1 overlapping tied pair(s) at rest settle t=36 (window 4 units)
[default (what `screen render` draws)] CONTROL UNAVAILABLE: no overlapping different-key pair is drawn
[default (what `screen render` draws)] [5] pgloading_eff01.t32 x [6] pgloading_eff02.t32 (key 49408): 1761 px differ (0.1911% of frame), max Δ 1 | ink 30864 / 21163 px, shared 3298 px
[everything on (focus+animated+primitives)] CONTROL ok: swapping [4] pgloading_loop4.rat x [6] pgloading_eff02.t32 moves 3654 px (max Δ 23)
[everything on (focus+animated+primitives)] [5] pgloading_eff01.t32 x [6] pgloading_eff02.t32 (key 49408): 1610 px differ (0.1747% of frame), max Δ 1 | ink 29173 / 21017 px, shared 3139 px
[AT THE SETTLE TIME (what the player sees)] 🔴 1 of the 1 tied pairs are GONE at this pose (an element is transparent or collapsed there) — they cannot cost a pixel
[AT THE SETTLE TIME (what the player sees)] CONTROL UNAVAILABLE: no overlapping different-key pair is drawn
entry 4 24 elements 11 overlapping tied pair(s) at rest settle t=198 (window 76 units)
[default (what `screen render` draws)] CONTROL ok: swapping [10] pteff04.t32 x [18] ptlogo_back2eff5.t32 moves 36305 px (max Δ 254)
[default (what `screen render` draws)] [11] ptloop01.rat x [12] ptloop02.rat (key 32784): NOT BOTH DRAWN — unreachable here
[default (what `screen render` draws)] [14] ptlogo_back2eff1.t32 x [15] ptlogo_back2eff2.t32 (key 32899): 295 px differ (0.0320% of frame), max Δ 1 | ink 2483 / 6547 px, shared 2483 px
[default (what `screen render` draws)] [14] ptlogo_back2eff1.t32 x [16] ptlogo_back2eff3.t32 (key 32899): 861 px differ (0.0934% of frame), max Δ 2 | ink 2483 / 9698 px, shared 2483 px
[default (what `screen render` draws)] [14] ptlogo_back2eff1.t32 x [17] ptlogo_back2eff4.t32 (key 32899): 1555 px differ (0.1687% of frame), max Δ 2 | ink 2483 / 13926 px, shared 2483 px
[default (what `screen render` draws)] [14] ptlogo_back2eff1.t32 x [18] ptlogo_back2eff5.t32 (key 32899): 6645 px differ (0.7210% of frame), max Δ 3 | ink 2483 / 22834 px, shared 2398 px
[default (what `screen render` draws)] [15] ptlogo_back2eff2.t32 x [16] ptlogo_back2eff3.t32 (key 32899): 420 px differ (0.0456% of frame), max Δ 1 | ink 6547 / 9698 px, shared 6547 px
[default (what `screen render` draws)] [15] ptlogo_back2eff2.t32 x [17] ptlogo_back2eff4.t32 (key 32899): 1209 px differ (0.1312% of frame), max Δ 2 | ink 6547 / 13926 px, shared 6547 px
[default (what `screen render` draws)] [15] ptlogo_back2eff2.t32 x [18] ptlogo_back2eff5.t32 (key 32899): 6641 px differ (0.7206% of frame), max Δ 2 | ink 6547 / 22834 px, shared 6360 px
[default (what `screen render` draws)] [16] ptlogo_back2eff3.t32 x [17] ptlogo_back2eff4.t32 (key 32899): 584 px differ (0.0634% of frame), max Δ 1 | ink 9698 / 13926 px, shared 9698 px
[default (what `screen render` draws)] [16] ptlogo_back2eff3.t32 x [18] ptlogo_back2eff5.t32 (key 32899): 6390 px differ (0.6934% of frame), max Δ 2 | ink 9698 / 22834 px, shared 9462 px
[default (what `screen render` draws)] [17] ptlogo_back2eff4.t32 x [18] ptlogo_back2eff5.t32 (key 32899): 5516 px differ (0.5985% of frame), max Δ 1 | ink 13926 / 22834 px, shared 13480 px
[everything on (focus+animated+primitives)] CONTROL ok: swapping [10] pteff04.t32 x [18] ptlogo_back2eff5.t32 moves 860461 px (max Δ 254)
[everything on (focus+animated+primitives)] [11] ptloop01.rat x [12] ptloop02.rat (key 32784): 0 px differ (0.0000% of frame), max Δ 0 | ink 0 / 0 px, shared 0 px
[everything on (focus+animated+primitives)] [14] ptlogo_back2eff1.t32 x [15] ptlogo_back2eff2.t32 (key 32899): 280 px differ (0.0304% of frame), max Δ 1 | ink 2516 / 6589 px, shared 2516 px
[everything on (focus+animated+primitives)] [14] ptlogo_back2eff1.t32 x [16] ptlogo_back2eff3.t32 (key 32899): 811 px differ (0.0880% of frame), max Δ 2 | ink 2516 / 9754 px, shared 2516 px
[everything on (focus+animated+primitives)] [14] ptlogo_back2eff1.t32 x [17] ptlogo_back2eff4.t32 (key 32899): 1527 px differ (0.1657% of frame), max Δ 2 | ink 2516 / 14072 px, shared 2516 px
[everything on (focus+animated+primitives)] [14] ptlogo_back2eff1.t32 x [18] ptlogo_back2eff5.t32 (key 32899): 6586 px differ (0.7146% of frame), max Δ 3 | ink 2516 / 22970 px, shared 2419 px
[everything on (focus+animated+primitives)] [15] ptlogo_back2eff2.t32 x [16] ptlogo_back2eff3.t32 (key 32899): 395 px differ (0.0429% of frame), max Δ 1 | ink 6589 / 9754 px, shared 6589 px
[everything on (focus+animated+primitives)] [15] ptlogo_back2eff2.t32 x [17] ptlogo_back2eff4.t32 (key 32899): 1204 px differ (0.1306% of frame), max Δ 2 | ink 6589 / 14072 px, shared 6589 px
[everything on (focus+animated+primitives)] [15] ptlogo_back2eff2.t32 x [18] ptlogo_back2eff5.t32 (key 32899): 6567 px differ (0.7126% of frame), max Δ 2 | ink 6589 / 22970 px, shared 6397 px
[everything on (focus+animated+primitives)] [16] ptlogo_back2eff3.t32 x [17] ptlogo_back2eff4.t32 (key 32899): 599 px differ (0.0650% of frame), max Δ 1 | ink 9754 / 14072 px, shared 9754 px
[everything on (focus+animated+primitives)] [16] ptlogo_back2eff3.t32 x [18] ptlogo_back2eff5.t32 (key 32899): 6333 px differ (0.6872% of frame), max Δ 2 | ink 9754 / 22970 px, shared 9512 px
[everything on (focus+animated+primitives)] [17] ptlogo_back2eff4.t32 x [18] ptlogo_back2eff5.t32 (key 32899): 5427 px differ (0.5889% of frame), max Δ 1 | ink 14072 / 22970 px, shared 13620 px
[AT THE SETTLE TIME (what the player sees)] 🔴 10 of the 11 tied pairs are GONE at this pose (an element is transparent or collapsed there) — they cannot cost a pixel
[AT THE SETTLE TIME (what the player sees)] CONTROL ok: swapping [10] pteff04.t32 x [20] ptlogo_back2eff.t32 moves 25310 px (max Δ 243)
[AT THE SETTLE TIME (what the player sees)] [11] ptloop01.rat x [12] ptloop02.rat (key 32784): NOT BOTH DRAWN — unreachable here
entry 5 16 elements 2 overlapping tied pair(s) at rest settle t=50 (window 12 units)
[default (what `screen render` draws)] CONTROL ok: swapping [1] ptbase.t32 x [2] pteff05.t32 moves 764030 px (max Δ 67)
[default (what `screen render` draws)] [3] ptloop01.rat x [4] ptloop02.rat (key 32784): NOT BOTH DRAWN — unreachable here
[default (what `screen render` draws)] [6] ptframe1.t32 x [7] ptframe2.t32 (key 32848): 0 px differ (0.0000% of frame), max Δ 0 | ink 4783 / 5297 px, shared 0 px
[everything on (focus+animated+primitives)] CONTROL ok: swapping [1] ptbase.t32 x [2] pteff05.t32 moves 725164 px (max Δ 50)
[everything on (focus+animated+primitives)] [3] ptloop01.rat x [4] ptloop02.rat (key 32784): 0 px differ (0.0000% of frame), max Δ 0 | ink 0 / 0 px, shared 0 px
[everything on (focus+animated+primitives)] [6] ptframe1.t32 x [7] ptframe2.t32 (key 32848): 0 px differ (0.0000% of frame), max Δ 0 | ink 4781 / 5305 px, shared 0 px
[AT THE SETTLE TIME (what the player sees)] CONTROL ok: swapping [1] ptbase.t32 x [2] pteff05.t32 moves 765778 px (max Δ 67)
[AT THE SETTLE TIME (what the player sees)] [3] ptloop01.rat x [4] ptloop02.rat (key 32784): NOT BOTH DRAWN — unreachable here
[AT THE SETTLE TIME (what the player sees)] [6] ptframe1.t32 x [7] ptframe2.t32 (key 32848): 0 px differ (0.0000% of frame), max Δ 0 | ink 4783 / 5297 px, shared 0 px
entry 6 18 elements 2 overlapping tied pair(s) at rest settle t=44 (window 12 units)
[default (what `screen render` draws)] CONTROL ok: swapping [11] ptbase.t32 x [12] pteff05.t32 moves 761600 px (max Δ 67)
[default (what `screen render` draws)] [0] ptframe3.t32 x [1] ptframe4.t32 (key 32848): 0 px differ (0.0000% of frame), max Δ 0 | ink 3646 / 3584 px, shared 0 px
[default (what `screen render` draws)] [14] ptloop01.rat x [15] ptloop02.rat (key 32784): NOT BOTH DRAWN — unreachable here
[everything on (focus+animated+primitives)] CONTROL ok: swapping [11] ptbase.t32 x [12] pteff05.t32 moves 721144 px (max Δ 50)
[everything on (focus+animated+primitives)] [0] ptframe3.t32 x [1] ptframe4.t32 (key 32848): 0 px differ (0.0000% of frame), max Δ 0 | ink 3646 / 3584 px, shared 0 px
[everything on (focus+animated+primitives)] [14] ptloop01.rat x [15] ptloop02.rat (key 32784): 0 px differ (0.0000% of frame), max Δ 0 | ink 0 / 0 px, shared 0 px
[AT THE SETTLE TIME (what the player sees)] CONTROL ok: swapping [11] ptbase.t32 x [12] pteff05.t32 moves 764104 px (max Δ 67)
[AT THE SETTLE TIME (what the player sees)] [0] ptframe3.t32 x [1] ptframe4.t32 (key 32848): 0 px differ (0.0000% of frame), max Δ 0 | ink 3646 / 3584 px, shared 0 px
[AT THE SETTLE TIME (what the player sees)] [14] ptloop01.rat x [15] ptloop02.rat (key 32784): NOT BOTH DRAWN — unreachable here
entry 7 30 elements 13 overlapping tied pair(s) at rest settle t=213 (window 46 units)
[default (what `screen render` draws)] CONTROL ok: swapping [14] pteff04.t32 x [22] ptlogo_back2eff5.t32 moves 278139 px (max Δ 248)
[default (what `screen render` draws)] [1] ptlogo2.t32 x [11] ptlogo_tm.t32 (key 32928): 1 px differ (0.0001% of frame), max Δ 1 | ink 58773 / 1062 px, shared 5 px
[default (what `screen render` draws)] [7] ptlogo_eff2.rat x [23] ptlogo_back2.t32 (key 32898): 1 px differ (0.0001% of frame), max Δ 1 | ink 47839 / 659 px, shared 3 px
[default (what `screen render` draws)] [15] ptloop01.rat x [16] ptloop02.rat (key 32784): NOT BOTH DRAWN — unreachable here
[default (what `screen render` draws)] [18] ptlogo_back2eff1.t32 x [19] ptlogo_back2eff2.t32 (key 32899): 211 px differ (0.0229% of frame), max Δ 1 | ink 2124 / 4909 px, shared 2124 px
[default (what `screen render` draws)] [18] ptlogo_back2eff1.t32 x [20] ptlogo_back2eff3.t32 (key 32899): 538 px differ (0.0584% of frame), max Δ 2 | ink 2124 / 7538 px, shared 2124 px
[default (what `screen render` draws)] [18] ptlogo_back2eff1.t32 x [21] ptlogo_back2eff4.t32 (key 32899): 941 px differ (0.1021% of frame), max Δ 2 | ink 2124 / 10876 px, shared 2124 px
[default (what `screen render` draws)] [18] ptlogo_back2eff1.t32 x [22] ptlogo_back2eff5.t32 (key 32899): 1237 px differ (0.1342% of frame), max Δ 2 | ink 2124 / 17678 px, shared 2124 px
[default (what `screen render` draws)] [19] ptlogo_back2eff2.t32 x [20] ptlogo_back2eff3.t32 (key 32899): 216 px differ (0.0234% of frame), max Δ 1 | ink 4909 / 7538 px, shared 4909 px
[default (what `screen render` draws)] [19] ptlogo_back2eff2.t32 x [21] ptlogo_back2eff4.t32 (key 32899): 663 px differ (0.0719% of frame), max Δ 2 | ink 4909 / 10876 px, shared 4909 px
[default (what `screen render` draws)] [19] ptlogo_back2eff2.t32 x [22] ptlogo_back2eff5.t32 (key 32899): 1023 px differ (0.1110% of frame), max Δ 2 | ink 4909 / 17678 px, shared 4909 px
[default (what `screen render` draws)] [20] ptlogo_back2eff3.t32 x [21] ptlogo_back2eff4.t32 (key 32899): 330 px differ (0.0358% of frame), max Δ 1 | ink 7538 / 10876 px, shared 7538 px
[default (what `screen render` draws)] [20] ptlogo_back2eff3.t32 x [22] ptlogo_back2eff5.t32 (key 32899): 702 px differ (0.0762% of frame), max Δ 2 | ink 7538 / 17678 px, shared 7538 px
[default (what `screen render` draws)] [21] ptlogo_back2eff4.t32 x [22] ptlogo_back2eff5.t32 (key 32899): 185 px differ (0.0201% of frame), max Δ 1 | ink 10876 / 17678 px, shared 10876 px
[everything on (focus+animated+primitives)] CONTROL ok: swapping [14] pteff04.t32 x [22] ptlogo_back2eff5.t32 moves 862138 px (max Δ 248)
[everything on (focus+animated+primitives)] [1] ptlogo2.t32 x [11] ptlogo_tm.t32 (key 32928): 3 px differ (0.0003% of frame), max Δ 1 | ink 58727 / 1062 px, shared 5 px
[everything on (focus+animated+primitives)] [7] ptlogo_eff2.rat x [23] ptlogo_back2.t32 (key 32898): 1 px differ (0.0001% of frame), max Δ 1 | ink 47217 / 664 px, shared 3 px
[everything on (focus+animated+primitives)] [15] ptloop01.rat x [16] ptloop02.rat (key 32784): 0 px differ (0.0000% of frame), max Δ 0 | ink 0 / 0 px, shared 0 px
[everything on (focus+animated+primitives)] [18] ptlogo_back2eff1.t32 x [19] ptlogo_back2eff2.t32 (key 32899): 193 px differ (0.0209% of frame), max Δ 1 | ink 2137 / 4917 px, shared 2137 px
[everything on (focus+animated+primitives)] [18] ptlogo_back2eff1.t32 x [20] ptlogo_back2eff3.t32 (key 32899): 511 px differ (0.0554% of frame), max Δ 2 | ink 2137 / 7552 px, shared 2137 px
[everything on (focus+animated+primitives)] [18] ptlogo_back2eff1.t32 x [21] ptlogo_back2eff4.t32 (key 32899): 931 px differ (0.1010% of frame), max Δ 2 | ink 2137 / 10892 px, shared 2137 px
[everything on (focus+animated+primitives)] [18] ptlogo_back2eff1.t32 x [22] ptlogo_back2eff5.t32 (key 32899): 1215 px differ (0.1318% of frame), max Δ 3 | ink 2137 / 17707 px, shared 2137 px
[everything on (focus+animated+primitives)] [19] ptlogo_back2eff2.t32 x [20] ptlogo_back2eff3.t32 (key 32899): 233 px differ (0.0253% of frame), max Δ 1 | ink 4917 / 7552 px, shared 4917 px
[everything on (focus+animated+primitives)] [19] ptlogo_back2eff2.t32 x [21] ptlogo_back2eff4.t32 (key 32899): 668 px differ (0.0725% of frame), max Δ 2 | ink 4917 / 10892 px, shared 4917 px
[everything on (focus+animated+primitives)] [19] ptlogo_back2eff2.t32 x [22] ptlogo_back2eff5.t32 (key 32899): 1022 px differ (0.1109% of frame), max Δ 2 | ink 4917 / 17707 px, shared 4917 px
[everything on (focus+animated+primitives)] [20] ptlogo_back2eff3.t32 x [21] ptlogo_back2eff4.t32 (key 32899): 319 px differ (0.0346% of frame), max Δ 1 | ink 7552 / 10892 px, shared 7552 px
[everything on (focus+animated+primitives)] [20] ptlogo_back2eff3.t32 x [22] ptlogo_back2eff5.t32 (key 32899): 720 px differ (0.0781% of frame), max Δ 2 | ink 7552 / 17707 px, shared 7552 px
[everything on (focus+animated+primitives)] [21] ptlogo_back2eff4.t32 x [22] ptlogo_back2eff5.t32 (key 32899): 187 px differ (0.0203% of frame), max Δ 1 | ink 10892 / 17707 px, shared 10892 px
[AT THE SETTLE TIME (what the player sees)] 🔴 11 of the 13 tied pairs are GONE at this pose (an element is transparent or collapsed there) — they cannot cost a pixel
[AT THE SETTLE TIME (what the player sees)] CONTROL ok: swapping [14] pteff04.t32 x [24] ptlogo_back2eff.t32 moves 268698 px (max Δ 247)
[AT THE SETTLE TIME (what the player sees)] [1] ptlogo2.t32 x [11] ptlogo_tm.t32 (key 32928): 1 px differ (0.0001% of frame), max Δ 1 | ink 58770 / 1062 px, shared 5 px
[AT THE SETTLE TIME (what the player sees)] [15] ptloop01.rat x [16] ptloop02.rat (key 32784): NOT BOTH DRAWN — unreachable here
entry 8 16 elements 2 overlapping tied pair(s) at rest settle t=50 (window 12 units)
[default (what `screen render` draws)] CONTROL ok: swapping [1] ptbase.t32 x [2] pteff05.t32 moves 771479 px (max Δ 66)
[default (what `screen render` draws)] [3] ptloop01.rat x [4] ptloop02.rat (key 32784): NOT BOTH DRAWN — unreachable here
[default (what `screen render` draws)] [6] ptframe1.t32 x [7] ptframe2.t32 (key 32848): 0 px differ (0.0000% of frame), max Δ 0 | ink 4778 / 5302 px, shared 0 px
[everything on (focus+animated+primitives)] CONTROL ok: swapping [1] ptbase.t32 x [2] pteff05.t32 moves 733320 px (max Δ 50)
[everything on (focus+animated+primitives)] [3] ptloop01.rat x [4] ptloop02.rat (key 32784): 0 px differ (0.0000% of frame), max Δ 0 | ink 0 / 0 px, shared 0 px
[everything on (focus+animated+primitives)] [6] ptframe1.t32 x [7] ptframe2.t32 (key 32848): 0 px differ (0.0000% of frame), max Δ 0 | ink 4782 / 5309 px, shared 0 px
[AT THE SETTLE TIME (what the player sees)] CONTROL ok: swapping [1] ptbase.t32 x [2] pteff05.t32 moves 773431 px (max Δ 66)
[AT THE SETTLE TIME (what the player sees)] [3] ptloop01.rat x [4] ptloop02.rat (key 32784): NOT BOTH DRAWN — unreachable here
[AT THE SETTLE TIME (what the player sees)] [6] ptframe1.t32 x [7] ptframe2.t32 (key 32848): 0 px differ (0.0000% of frame), max Δ 0 | ink 4778 / 5302 px, shared 0 px
entry 9 18 elements 2 overlapping tied pair(s) at rest settle t=44 (window 12 units)
[default (what `screen render` draws)] CONTROL ok: swapping [11] ptbase.t32 x [12] pteff05.t32 moves 768159 px (max Δ 66)
[default (what `screen render` draws)] [0] ptframe3.t32 x [1] ptframe4.t32 (key 32848): 0 px differ (0.0000% of frame), max Δ 0 | ink 3646 / 3584 px, shared 0 px
[default (what `screen render` draws)] [14] ptloop01.rat x [15] ptloop02.rat (key 32784): NOT BOTH DRAWN — unreachable here
[everything on (focus+animated+primitives)] CONTROL ok: swapping [11] ptbase.t32 x [12] pteff05.t32 moves 729480 px (max Δ 50)
[everything on (focus+animated+primitives)] [0] ptframe3.t32 x [1] ptframe4.t32 (key 32848): 0 px differ (0.0000% of frame), max Δ 0 | ink 3646 / 3584 px, shared 0 px
[everything on (focus+animated+primitives)] [14] ptloop01.rat x [15] ptloop02.rat (key 32784): 0 px differ (0.0000% of frame), max Δ 0 | ink 0 / 0 px, shared 0 px
[AT THE SETTLE TIME (what the player sees)] CONTROL ok: swapping [11] ptbase.t32 x [12] pteff05.t32 moves 771048 px (max Δ 66)
[AT THE SETTLE TIME (what the player sees)] [0] ptframe3.t32 x [1] ptframe4.t32 (key 32848): 0 px differ (0.0000% of frame), max Δ 0 | ink 3646 / 3584 px, shared 0 px
[AT THE SETTLE TIME (what the player sees)] [14] ptloop01.rat x [15] ptloop02.rat (key 32784): NOT BOTH DRAWN — unreachable here
entry 12 10 elements 1 overlapping tied pair(s) at rest settle t=44 (window 8 units)
[default (what `screen render` draws)] CONTROL UNAVAILABLE: no overlapping different-key pair is drawn
[default (what `screen render` draws)] [8] pgloading_eff01.t32 x [9] pgloading_eff02.t32 (key 49408): 1761 px differ (0.1911% of frame), max Δ 1 | ink 30864 / 21163 px, shared 3298 px
[everything on (focus+animated+primitives)] CONTROL DEAD: swapping [6] pgloading_loop5.rat x [7] pgloading_baseeff.t32 changes NOTHING — zeros below are uninterpretable
[everything on (focus+animated+primitives)] [8] pgloading_eff01.t32 x [9] pgloading_eff02.t32 (key 49408): 0 px differ (0.0000% of frame), max Δ 0 | ink 0 / 0 px, shared 0 px
[AT THE SETTLE TIME (what the player sees)] 🔴 1 of the 1 tied pairs are GONE at this pose (an element is transparent or collapsed there) — they cannot cost a pixel
[AT THE SETTLE TIME (what the player sees)] CONTROL UNAVAILABLE: no overlapping different-key pair is drawn
entry 15 10 elements 1 overlapping tied pair(s) at rest settle t=44 (window 8 units)
[default (what `screen render` draws)] CONTROL UNAVAILABLE: no overlapping different-key pair is drawn
[default (what `screen render` draws)] [8] pgloading_eff01.t32 x [9] pgloading_eff02.t32 (key 49408): 1761 px differ (0.1911% of frame), max Δ 1 | ink 30864 / 21163 px, shared 3298 px
[everything on (focus+animated+primitives)] CONTROL DEAD: swapping [6] pgloading_loop5.rat x [7] pgloading_baseeff.t32 changes NOTHING — zeros below are uninterpretable
[everything on (focus+animated+primitives)] [8] pgloading_eff01.t32 x [9] pgloading_eff02.t32 (key 49408): 0 px differ (0.0000% of frame), max Δ 0 | ink 0 / 0 px, shared 0 px
[AT THE SETTLE TIME (what the player sees)] 🔴 1 of the 1 tied pairs are GONE at this pose (an element is transparent or collapsed there) — they cannot cost a pixel
[AT THE SETTLE TIME (what the player sees)] CONTROL UNAVAILABLE: no overlapping different-key pair is drawn
default-options summary: 26 of 30 overlapping tied pairs change at least one pixel; 10 dead/unavailable controls

9
docs/re/structures/ui-paint-order-derived-check.md
View File

@@ -1,5 +1,14 @@
# ✅ Does the derived paint order reproduce the measured ones? Mostly — and the gap is bounded
> ✅ **The open half of this page is closed (2026-08-29): the tie-break's pixel
> cost is measured.** At the instant the player sees, it is **at most one pixel at
> Δ1, on the Japanese title only, and exactly zero on all five port screens** —
> [`ui-tie-break-cost-at-settle.md`](ui-tie-break-cost-at-settle.md). The 24-pair
> bound below is a **`rest()` count** and survives as such (entry 7's 16
> reproduces exactly), but 10 of the title's 11 pairs are between elements that
> are *transparent* on the settled screen. Why the game orders ties as it does is
> still unknown, and now costs one pixel.
**Status:** ✅ **checked, with numbers.** `compose` uses a paint order *measured
from the running game* for the builds that have one and falls back to
`derived_paint_order` — a sort on each sprite's layer key — everywhere else. The

118
docs/re/structures/ui-tie-break-cost-at-settle.md Normal file
View File

@@ -0,0 +1,118 @@
# What the paint-order tie-break actually costs: one pixel, on one screen
**Classification: decoded.** Both terms come from the disc — the pairs from the
keyframe table, the pixels from rendering the same bundle twice with two
elements swapped. No capture is involved, and none is needed: this measures how
much a *wrong* answer could cost, not which answer is right.
## The question this closes
[`ui-paint-order-derived-check.md`](ui-paint-order-derived-check.md) bounds
*where* a wrong tie-break could show — same-layer-key pairs whose rects overlap —
and says outright that **nobody has measured how many of them change a pixel**.
That was the last open half of Q3.
## The answer
**At the instant the player actually sees, the tie-break costs at most one pixel,
at a maximum channel difference of 1, and only on the Japanese title. On all five
port screens it is exactly zero.**
| entry | screen | live tied pairs at settle | measured cost |
|---|---|---|---|
| 4 | title (EN) | 1 | **0 px** — the pair is `ptloop01`×`ptloop02`, not both drawn |
| 5 | main menu | 2 | **0 px** — `ptframe1`×`ptframe2` share **no ink**; the other is undrawn |
| 6 | submenu | 2 | **0 px** — same shape |
| 8 | submenu | 2 | **0 px** — same shape |
| 9 | submenu | 2 | **0 px** — same shape |
| 7 | title (JP) | 2 | **1 px, max Δ 1** — `ptlogo2`×`ptlogo_tm`, 5 px of shared ink |
| 0, 1, 12, 15 | loading | **0** | no pair is live at all |
Full run: [`tie-break-pixel-cost-gp_title.txt`](../data/tie-break-pixel-cost-gp_title.txt).
## Why the number moved: `rest()` was counting elements that are not there
The census that produced the earlier bound posed every element at `rest()`, its
own last hold keyframe. That draws **transients at their peak**
([`ui-settle-time.md`](ui-settle-time.md)), and the title's ties are almost
entirely *between transients*: `ptlogo_back2eff1`…`eff5` are five staggered
two-frame flashes, all extinguished by t110, and they account for 10 of the
title's 11 overlapping tied pairs.
A tie between two elements that are transparent cannot cost a pixel however much
their rects overlap. Posing at the settle time instead:
| | entry 4 | entry 7 | entries 0/1/12/15 |
|---|---|---|---|
| overlapping tied pairs at `rest()` | 11 | 13 | 1 each |
| **still live at the settle time** | **1** | **2** | **0** |
## It is not a knife-edge
The obvious objection is that "at the settle time" picks one instant, and a
different instant might give a different count. Sweeping every keyframe time and
every midpoint between keyframe times
([`tie-break-live-over-time-gp_title.txt`](../data/tie-break-live-over-time-gp_title.txt)):
| entry | peak live pairs over the whole timeline | **max anywhere in the settle window** |
|---|---|---|
| 4 | 6 | **1** |
| 7 | 6 | **2** |
| 5 / 6 / 8 / 9 | 2 | 2 |
| 0 / 1 / 12 / 15 | 1 | **0** |
The count is **flat across the entire window**, not just at its midpoint. The four
loading bundles are the sharpest case: their tie is live only at t17–t33 — during
the build-in — and dead everywhere else, which matters because their settle
windows are narrow (4 and 8 units) and would otherwise deserve little trust.
## Controls
* ✅ **A live control on every entry that reports a zero.** Each run also swaps an
overlapping pair with **different** keys — an order the game demonstrably does
care about — and requires it to move pixels. It moves 25 310 px on the title,
268 698 px on the JP title, and ~765 000 px on the four menu screens.
* ⚠️ **Entries 0, 1, 12, 15 have no live control** ("no overlapping different-key
pair is drawn"). Their zeros rest on the *keyframe data* — no tied pair has both
elements opaque at any instant in the window — not on a render, so a dead
control does not undermine them. But nothing here demonstrates the renderer
would notice a swap on those bundles.
* ✅ **Shared-ink accounting.** A zero is only meaningful with an explanation. The
`ptframe` pairs overlap by bounding box and share **0 px** of actual ink; the
JP title's 1 px comes from 5 px of shared ink between `ptlogo2` and
`ptlogo_tm`.
## 🟡 Refutation attempt: the corpus's "24 overlapping pairs" — it survives
Recounted independently. Without the alpha/scale filter this document adds, the
per-entry counts are `e0:1 e1:1 e4:13 e5:2 e6:2 e7:16 e8:2 e9:2 e12:1 e15:1`,
total 41 — and **entry 7's 16 reproduces the corpus's figure exactly**. The 24 is
that population scoped to the entries without a measured order. Adding the filter
takes the total to 36.
So the count stands as a **rest-pose upper bound**. What this document overturns
is its *interpretation*: 24 was being read as the surface on which a wrong
tie-break could show, and at the instant the player sees, that surface is one
pixel.
## Reach and what is still open
❔ **Why the game orders ties as it does is still unknown**, and this does not
touch it — eight candidate rules remain refuted in
[`ui-paint-order-derived-check.md`](ui-paint-order-derived-check.md). What changes
is that the question is no longer worth much: getting it wrong costs one pixel on
a screen the port does not ship.
⚠️ **`GP_TITLE` only.** Other paks were not swept. The method is bundle-agnostic
but the numbers are not.
⚠️ **Rect overlap is still an approximation** (pivot doubled, placed at the pose).
It is used only to *choose candidate pairs*; every reported cost is a real render
diff, so the approximation can add candidates but cannot invent a cost.
## Reproducing
```bash
cargo run -p sylpheed-formats --example tie_break_pixel_cost -- "$SYLPHEED_DISC/dat/GP_TITLE.pak"
cargo run -p sylpheed-formats --example tie_cost_over_time -- "$SYLPHEED_DISC/dat/GP_TITLE.pak"
```